JP2941808B2 - Motor driven camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a pre-winding type motor driven camera in which a film is wound up by the entire frame in advance when the film is loaded, and the film is rewound for each photographing.

(Prior art)

In recent years, various so-called preliminary winding type motor-driven cameras have been proposed.

A normal pre-winding camera starts a pre-winding operation by closing a back cover, performs a loading operation of winding a film leader onto a spool, and subsequently winds up all the frames of the film.

In the other method, in which only the loading operation is performed when the film is loaded and the film is wound up for each shot, when the back lid is accidentally opened with the film wound up to a certain extent and closed immediately, Since unexposed film still remains in the patrone,
It is desirable to carry out idle feeding in the same way as film loading.

Next, let us consider what happens when the back lid is accidentally opened during shooting in the camera of the preliminary winding type. For cameras that do not use the pre-winding method described above, the camera automatically winds up when the back lid is closed, and sends frames exposed when the back lid is opened, making it possible to prepare for shooting when empty winding is completed. Specifications. However, if the same concept is applied to the camera of the pre-winding system, the pre-winding will be performed by closing the back cover again, which means that the frame that was taken back in the patrone that was taken so far will be This causes the film to be wound up on the spool side, and when the shutter is released next time, the photograph is taken again in the photographed frame, which is a serious problem.

Therefore, it is more desirable to use a specification that permits the next release without feeding the film when the back cover is closed after the back cover is opened during shooting. Because the back cover was opened, unphotographed film that was not in the patrone was exposed, but the photographer immediately recognized that the film was accidentally opened, Because it closes, only a few frames are exposed, and the remaining film is likely to be saved. Therefore, the photographer
It is possible to return to normal shooting by appropriately taking aerial shots.

Next, suppose that the film is replaced with another one in the middle of shooting when the above-mentioned specification is adopted. In this case, the camera opens the back cover by mistake and closes the back cover again, and since the input signal system to the camera circuit does not change, the camera executes the above operation. Will be. In other words, even if a new film is loaded and the back lid is closed, the film is not wound up, but when the release button is pressed, the photographing sequence is started, and then the film is rewound in the direction of the patrone. The result is that everything is returned to the patrone. Therefore, it is a fatal defect for a user who performs such a thing.

[Object of the invention]

The purpose of the present invention is to take into account the specialness of the pre-winding system, and accidentally open the back cover during shooting, and continue shooting when the back cover is closed again, while separating the film during shooting. If you want to replace it with a new one, take out the old film, close the back cover without loading the film, and then load the new film to execute the pre-winding. It is to provide a driving camera.

[Features of the invention]

The invention according to claim (1) is a motor-driven camera of a pre-winding type in which the film is wound up by the entire frame in advance by closing the back cover at the time of loading the film, and the film is rewound for each photographing. A writable / readable memory, a load detection circuit for determining whether or not a film is loaded, a back cover detection circuit for detecting that the back cover is closed, and a state in which no film is loaded by the load detection circuit. ,
When the back cover detection circuit detects that the back cover is closed, the control circuit forcibly sets the setting of the memory to a state of performing a preliminary winding operation.

According to a second aspect of the present invention, there is provided a motor-driven camera of a pre-winding type in which the film is wound up in advance for all frames by closing the back cover when the film is loaded, and the film is rewound for each photographing. A writable / readable memory, a loading detection circuit for determining the presence / absence of film loading, a back lid detection circuit for detecting the closing of the back lid, and setting of the memory when a preliminary winding operation is performed. A first control circuit for setting a state in which the preliminary winding operation is prohibited;
When the back cover detection circuit detects that the back cover is closed while the load detection circuit is detecting the loading of the film, the memory setting is such that the preliminary winding operation is prohibited. And a second control circuit for prohibiting the preliminary winding operation.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment shows a case where the present invention is applied to a single-lens reflex camera.

FIG. 1 shows a general arrangement of a single-lens reflex camera, and reference numeral 10 denotes a camera body. The camera body has a detachable photographing lens 1 mounted thereon. Reference numeral 2 denotes a release button, reference numeral 3 denotes a rewind button for forcibly rewinding all frames, and reference numeral 4 denotes a battery disposed at the bottom position of the camera body. The battery 4 can be easily taken out of the battery storage room by removing a member corresponding to the battery cover so that the battery 4 can be easily taken out when replacing the battery. Is configured. M1 is a motor, and this motor
M1 serves as a driving source for driving both the film winding system and the film rewinding system, and also serves as a driving source for driving the front-plate system charge mirror. Reference numeral 5 denotes a film winding drive mechanism, 6 denotes a film rewind drive mechanism, 7 denotes a mirror box drive mechanism as a front plate system, and 8 denotes a film counter mechanism.

 FIG. 2 is a perspective view of each component.

Next, each configuration will be described in detail with reference to FIG. 2 and detailed drawings for each configuration.

First, the motor M1 will be described. The motor M1 has two upper and lower output shafts, and both output shafts are configured to rotate synchronously.

Next, the film winding drive mechanism will be described. In the figure, reference numeral 20 denotes a first pinion fixed to an output shaft below the motor M1, and 22 denotes a transmission gear that meshes with the first pinion 20. The transmission gear 22 is connected to a sun gear 26 via a connection shaft 24. doing. Numerals 26 to 30 constitute a planetary clutch. A planetary gear 28 that can revolve and move by a planetary lever 30 (combined with the sun gear 26) is engaged with the sun gear 26. Reference numeral 32 denotes a transmission gear, which is disposed at a position where meshing and non-meshing are performed by the revolution of the planetary gear 28, and meshes with the planetary gear 28 by the revolving motion accompanying the counterclockwise rotation of the sun gear 26 to rotate the motor M1. Is transmitted. Further, when the motor M1 rotates in the reverse direction and the sun gear 26 rotates clockwise, the engagement between the transmission gear 32 and the planetary gear 28 is disconnected. Reference numerals 34 and 36 denote transmission gears for transmitting the rotation of the transmission gear 32. The transmission gear 36 in the form of a two-stage gear meshes with a sun gear 38 here.

38 to 42 constitute the first planetary clutch,
The small gear of the step-shaped sun gear 38 is the first planetary lever 42
The first planetary gear 40 that can revolve and move is meshed with the small gear of the sun gear 38 by friction coupling. 38,44
And 46 constitute a second planetary clutch, and the small gear of the sun gear 38 meshes with the second planetary gear 46 which can revolve by means of the second planetary lever 44 (combined with the small gear of the sun gear 38 by friction). doing.

Reference numeral 48 denotes a transmission gear for driving the spool, which is disposed at a position where the first planetary gear 40 meshes and disengages with the revolution of the first planetary gear 40, and which rotates by the revolving motion accompanying the clockwise rotation of the sun gear 38. The output rotation of the motor M1 is transmitted by meshing with the gear 40. When the motor M1 rotates in the reverse direction, the transmission is interrupted by the above-mentioned upstream planetary clutch mechanisms 26 to 30, so that the first planetary lever 42 is particularly rotated counterclockwise. Absent.

50 is a spool gear for driving the spool, and 52 is a spool for winding the film. The spool gear 50 always meshes with the transmission gear 48 and has a fixed relationship with the spool 52. (In FIG. 2, the spool gear 50 and the spool 52 are drawn apart for easy understanding of the drawing. Both are actually fixed). A spool claw 52a meshing with the perforation of the film F is provided on the peripheral surface of the spool 52.
Are formed.

On the other hand, 54 is a transmission gear for driving the sprocket, and 2
The large gear is formed in the shape of a stepped gear, and
Is arranged at a position where meshing and non-meshing are performed by the revolution of
The revolving motion accompanying the clockwise rotation of the sun gear 38 meshes with the second planetary gear 46 to transmit the output rotation of the motor M1.

56 is a sprocket gear for driving a sprocket, and 58 is a driving sprocket. The sprocket gear 56 always meshes with the small gear of the transmission gear 54, and is in a rotationally interlocked relationship with the drive sprocket 58 (in FIG. 2, the sprocket gear 56 and the drive sprocket 58 are provided for easy understanding of the drawing.
Although the mechanism for interlocking with the above is omitted, the two are actually connected by a shaft or the like so that the two can be rotated and interlocked.) The drive sprocket 58 is formed with teeth 58a that mesh with the perforation of the film F.

The peripheral speed ratio of the spool 52 is set to be larger than that of the drive sprocket 58.

In the vicinity of the tip of the second planetary lever 44 of the second planetary clutch mechanism, a structure for disengaging the second planetary gear 46 and the transmission gear 54 and holding the transmission gear 54 in that state is formed. This structure will be described with reference to FIG.

That is, the notch 44 is provided near the tip of the second planetary lever 44.
a, a protrusion 44b and a mountain-shaped click mountain 44c are formed. Reference numeral 60 denotes a reset lever which is supported by the swing itself by the center of rotation 60a, and comprises a bent restricting portion 60b and a first projecting portion 60.
c and a second protruding portion 60d protruding toward the back lid side. Reference numeral 62 denotes a holding lever, which is supported concentrically with the rotation center 60a of the reset lever 60, and is swingable at a slight angle regulated by the regulating portion 60b. The holding lever 62 has a pin 62a at a position corresponding to the notch 44a of the second planetary lever 44, and a click projection 62b at a position corresponding to the click mountain 44c. Reference numeral 64 denotes a holding spring fixed to the reset lever 60, which elastically presses the holding lever 62 to bring the click projection 62b into contact with the click mountain 44c. A reset spring 66 elastically presses the reset lever 60 in a counterclockwise direction (in FIG. 3). Reference numeral 70 denotes a back cover of the camera which is supported so as to be capable of opening and closing by a rotating shaft 70a, and when the back cover is in a closed state, the pushing portion 70b pushes the second projecting portion 60d. Reset lever against reset spring 66
60 is pushed and held at the positions shown in FIGS. 2 and 3 (a) and (b).

Accordingly, the second planetary lever 44 is in the state of starting film winding, as shown in FIG.
And the transmission gear 54 are meshed. Then, after the leader of the film is wound around the spool 52 by winding the film, the drive sprocket 58 is then moved to the film F.
Therefore, the rotation speeds of the second planetary gear 46 and the transmission gear 54 do not match. Therefore, in the initial stage of film winding, a force rotating clockwise (as viewed from the bottom direction in FIG. 3) acts on the second planetary lever 44 as a repulsive force, and rotates the lever 44 clockwise. Let it. At this time, as shown in FIG. 3 (b), the click projection 62b gets over the click mountain 44c, and the engagement between the second planetary gear 46 and the transmission gear 54 is cut off. In this state, the holding lever 62 is pushed toward the second planetary lever 44 by the holding spring 64, and the click projection 62b is moved to the click mountain 44c.
Is held to press the position from the top to the slope.

Then, this state (the state of FIG. 3B) is
Is held until the next opening, and thereafter, only the spool 52 (spool drive) exerts a driving force for winding the film F.

When the back cover 70 is opened as shown in FIG. 3 (c), the reset lever 60 is pressed by the reset spring 66 and swings counterclockwise, so that the holding lever 62 also swings counterclockwise. Then, the pin 62a pushes the protruding portion 44b to swing the second planetary lever 44 counterclockwise, thereby returning the second planetary gear 46 to the initial position where it can mesh with the transmission gear 54.

Next, the film counter mechanism and the film feed detecting mechanism will be described. Referring back to FIG. 2, reference numeral 80 denotes a driven sprocket, which does not interlock with the driving sprocket 58;
It rotates only following the movement of the film F. Reference numeral 82 denotes a transmission gear fixedly connected to the driven sprocket 80. Reference numeral 84 denotes a detection gear that meshes with the transmission gear 82, and feeds a film corresponding to one frame of the film (normally, 8 perforations).
Is set to rotate once. 86 is a counter feed shaft with a notch tooth 86a formed at the upper end,
It rotates in conjunction with the detection gear 84. The rotation interlock between the two is performed by the internal teeth 84a (see FIG. 4) formed in the center hole of the detection gear 84 and the external teeth 86 formed at the lower end of the counter feed shaft 86.
b (see FIG. 4).
However, the meshing between the internal teeth 84a and the external teeth 86b is set so as to be loose in the radial dimension, so that the counter feed shaft 86 can move slightly in the radial direction with respect to the detection gear 84. become. Reference numeral 88 denotes a counter gear rotatably supported by a center shaft 88a and urged to rotate clockwise by a spring (not shown).
A tooth portion 88b is formed for meshing with the a and rotating by one pitch with one rotation of the counter feed shaft 86. On the upper surface, a film frame number display 8 is provided at an interval corresponding to the pitch of the tooth portion 88b.
8c is attached. Reference numeral 90 denotes a counter reset lever which is swingably supported by a center shaft 90a. The projecting pin 90b is pushed by the pushing portion 70c when the back cover 70 is closed, and the counter feed shaft 86 is turned when the counterclockwise swing is performed. Pushing part 90 that pushes
c is formed. Reference numeral 92 denotes a spring whose center is supported by a pin 90d formed on the counter reset lever 90. One end of the spring 92 contacts the fixed pin 92a, the other end contacts the counter feed shaft 86, and When the cover 70 is closed (the state shown in FIG. 2), the counter feed shaft 86 is elastically pressed toward the center of the counter gear 88, and the upper end of the feed shaft 86 (the position of the notch teeth 86a) and the gear 88 are moved. Of the gear 88 and prevent the gear 88 from returning to the initial position. On the other hand, when the back cover 70 is opened, the holding of the counter reset lever 90 itself is released, the reset lever 90 swings counterclockwise by the urging force of the spring 92, and the pushing portion 90c moves the counter feed shaft. 86 is pushed in the opposite direction to the counter gear 88. As a result, the counter gear 88 becomes free to rotate, and the initial position (“E” as the number of film frames displayed on the display window) is displayed by a spring force (not shown).
Rotate clockwise until is located). After that,
When the back lid 70 is closed, the upper end of the counter feed shaft 86 enters the tooth portion 88b of the counter gear 88, and the gear 88 is intermittently rotated one notch by the notch tooth 86a in the addition direction. Can be sent.

Reference numeral 94 denotes a detection board, which is provided at a lower surface position of the detection gear 84. The detection gear 84 and the detection board 94 constitute a mechanism for detecting the feed amount of the film F, and a detailed structure will be described below with reference to FIGS. 4 and 5. FIG. 4 shows a view of the detection gear 84 as viewed from the back side, on which a sliding brush 85 is attached. Figure 5 shows the detection board
FIG. 9 is a view of the surface of the sliding brush 85 as the detection gear 84 rotates, showing a comb-like pattern 94a, a duty control pattern 94b, a brake control pattern 94c, and a ground. A pattern 94d is formed. The patterns 94a to 94d are connected to terminals 95 to 97, respectively. The area of the width in which the sliding brush 85 actually slides is indicated by a reference numeral 98 by a two-dot chain line. Here, terminal 96
The terminal 95 can detect a movement signal (pulse signal) during the frame feeding of the film F, and the terminal 97 can detect the duty near the frame feeding end of the film. The control range can be detected, and the brake control range at the terminal end of the frame feeding of the film F can be detected by the terminals 95 and 97. To be more specific, referring to the time chart at the time of film rewinding in FIG. 6, if a ground level signal is supplied to the terminal 96, the sliding brush is first rewinded by one frame.
A pulse signal is obtained at the terminal 95 by the 85 sliding between the comb-like pattern 94a and the ground pattern 94d.
Since the pulse signal generation interval is synchronized with the film feeding speed, if the pulse signal generation interval is shorter than a predetermined time, the film F is properly fed (both winding and rewinding). Conversely, if it is longer than the predetermined time, the battery voltage has dropped or the winding or rewinding of the film F has been completed for all frames (the winding of all the frames of the film has been completed. (The state in which the film has been wound into the patrone).

Next, the sliding brush 85 slides between the duty control pattern 94b and the ground pattern 94d, so that a ground level signal is obtained at the terminal 97. This timing is synchronized with the vicinity of the end of the rewinding (frame feed) for one frame of the film F so that the start end 94b-1 of the duty control pattern 94b is synchronized.
Is set, and the motor M1 is switched from full energization to duty pulse energization in order to decelerate, and deceleration control is performed.

Further, the sliding brush 85 is a duty control pattern.
94b, brake control pattern 94c and ground pattern 94d
, A ground level signal is obtained at both terminals 95 and 97. At this timing, the start end 94c-1 of the brake control pattern 94c is set so as to synchronize immediately before the end of the rewinding of one film frame (with an allowance for overrun), from which the motor M1 is rapidly stopped. In this case, the operation is switched to a short circuit and stop control is performed.

Next, the film rewind drive mechanism and the mirror box drive mechanism will be described.

2, reference numeral 100 denotes a second pinion fixed to the output shaft above the motor M1, and reference numeral 102 denotes a two-stage gear-shaped transmission gear that meshes with the second pinion 100. 104 to 108 constitute a planetary clutch, and mesh with the transmission gear 102.
The planetary lever 108 (sun gear 10)
A planetary gear 106 in the form of a two-stage gear that can revolve and reciprocate by means of a friction coupling with the gear 4 is engaged. Reference numeral 110 denotes a rewind gear, which revolves in a first direction of the planetary gear 106 (clockwise rotation of the sun gear 104 due to clockwise rotation of the motor M1).
The planetary gear 106 is arranged at a position where it meshes with the small gear. Reference numeral 112 denotes a rewinding fork that meshes with a known film cartridge shaft, and is connected to the rewinding gear 110 by a strong friction.

On the other hand, reference numeral 120 denotes a transmission gear in the mirror / charging drive transmission system, which revolves in the second direction of the planetary gear 106 (motor M1).
The counterclockwise rotation of the sun gear 104 due to the counterclockwise rotation of the planetary gear 106) causes the planet gear 106 to engage with the large gear. Reference numeral 122 denotes a transmission shaft having one end fixed to the transmission gear 120, and a worm gear 124 fixed to the other end. Reference numeral 126 denotes a mirror drive gear that meshes with the worm gear 124 and rotates clockwise (when the motor M1 rotates counterclockwise). A mirror drive cam 128 is integrally formed on the front surface side, and the mirror drive gear 128 is positioned on the rear surface side. Detection brush 130 (described later)
Has been fixed. Reference numeral 132 denotes a mirror driving lever composed of two levers, and serves as a cam follower for the mirror driving cam 128. That is, the mirror drive lever 132 receives a counterclockwise rotation drive by one end portion 132a slidingly contacting the climbing cam surface 128a (see FIG. 7) of the mirror drive cam 128, and the flat cam surface 128b (the 7, the counterclockwise rotation state is maintained by sliding contact with the down cam surface 128 c (see FIG. 7). Face 128c
(A state in which と and） correspond to each other in position), whereby clockwise rotation (return) is permitted. The other end 132b of the mirror drive lever 132 performs a mirror drive by receiving a swing control corresponding to a rotation position of each cam surface of the mirror drive cam 128 described above. Reference numeral 134 denotes a movable mirror, which is a viewfinder observation position (mirror down state shown in FIGS. 2 and 7A) for reflecting subject light transmitted through the photographing lens to a not-shown viewfinder optical system, and rotating. 7 (b), and is rotatably supported so as to obtain an exposure retract position (mirror up state shown in FIG. 7 (b)) for directing the subject light in the film direction. Reference numeral 136 denotes a support frame to which the movable mirror 134 is fixed. Rotation shafts 136a are formed at both side ends, and are supported by the rotation shafts 136a so as to be rotatable in the mirror box. 138 is support frame 1
The mirror pin 138 is formed on one side surface of the mirror 36. The mirror pin 138 is in contact with the other end 132b of the mirror drive lever 132. The support frame 136 is formed by a spring 140.
It is constantly receiving a spring bias in the counterclockwise direction (mirror down direction). Therefore, the mirror drive lever 132 receives a rotational drive in the counterclockwise direction when the one end portion 132a slides on the climbing cam surface 128a of the mirror drive cam 128, and slides on the flat cam surface 128b to rotate the mirror drive lever 132. The rotation (return) in the clockwise direction is allowed by maintaining the rotation state in the direction and slidingly contacting the down cam surface 128c. And
The other end 132b of the mirror drive lever 132 receives control in accordance with the rotational position of each cam surface of the mirror drive cam 128, thereby pushing the mirror pin 138 and moving the movable mirror 1
The mirror up operation of the mirror pin 138, the pushing of the mirror pin 138 is continued to maintain the mirror up state, and the mirror pin 138
Is released to allow the mirror down.

Reference numeral 142 denotes a shutter charge gear that meshes with the mirror drive key 126 and rotates counterclockwise, and a shutter charge cam 144 is integrally formed on the front surface side. In addition,
The shutter gear 142 is connected to the mirror driving gear 126.
And one-to-one transmission (reduction ratio 1.0). In this case, the shutter charge gum 144 is a climbing cam surface 144a (see FIG. 7) for driving a shutter charge lever 146 described below in a counterclockwise direction, and the rotation position (charge state) of the lever 146. A flat cam surface 144b (see FIG. 7) for keeping the same and a down cam surface 144c (see FIG. 7) for allowing the lever 146 to rotate clockwise are formed.

Reference numeral 146 denotes a shutter lever formed in a substantially L-shape, which is rotatably supported by a center shaft 146a, and has a role as a cam follower of the shutter charger cam 144. That is, when the roller 146b supported at one end of the shutter charge lever 146 comes into contact with the climbing cam surface 144a of the shutter charge cam 144, the roller 146b is rotated counterclockwise, and the flat cam The rotation in the counterclockwise direction is maintained by contact with the surface 144b, and the rotation in the clockwise direction is allowed when the roller 146b reaches the phase of the down cam surface 144c. The roller 146c supported by the operating end of the shutter charger lever 146 is controlled according to the rotation position of each cam surface of the shutter charger cam 144, thereby forming a roller in the shutter unit. Of one of the levers of the shutter, the shutter operation of the shutter and the pushing of the lever for the shutter are continued to maintain the charging operation (at the same time, the travel preparation position of both the front blade group and the rear blade group of the shutter). The shutter unit itself has already been filed as Japanese Utility Model Application No. 61-39629 (Japanese Utility Model Application Laid-Open No. 62-151528), so detailed description is omitted.) Releases the pushing of the lever for charging and returns (releases the mechanical holding of both the shutter front blade group and the rear blade group at the travel preparation position, and then performs the shutter travel by controlling the energization of the control electromagnet. Possible).

As can be easily understood by comparing both FIG. 7 (b) and FIG. 7 (c), the mirror driving cam can be easily understood.
The mirror drive phase of the mirror drive lever 132 by the mirror drive lever 128 and the charge drive phase of the shutter charge lever 146 by the shutter charge cam 144 are completely shifted from each other. That is, as shown in FIG. 7 (c), when the shutter charge lever 144 is being driven by the shutter charge cam 144, the mirror drive cam 128 does not push the mirror drive lever 132. The movable mirror 134 enters a mirror down state. FIG. 7 (b)
When the mirror drive lever 132 is pushed by the mirror drive cam 128 to move the movable mirror 134 to the mirror up state, the shutter charge cam 144 releases the shutter charge lever 146 to release the shutter. The mechanical holding (tension) of the blade group and the rear blade group at the traveling preparation position is released.

Next, a mechanism for electrically detecting the phases of the shutter charger and the mirror up will be described with reference to FIG.

A signal board 160 (omitted in FIG. 2 for simplicity of the drawing) is disposed at a position on the back side of the mirror driving gear 126 where the brush 130 can slide. On the signal board 160, three position detection patterns, that is, a ground pattern 161, an operation end detection pattern 162, and an overrun detection pattern 163 are formed by vapor deposition or the like. FIGS. 8A and 8B show the relationship between each of the patterns 161 to 163 and the brush 130 fixed to the back surface of the mirror driving gear 126.
This will be described with reference to FIG.

Here, the sliding portion 130a of the brush 130 is divided into a comb-like shape to enhance the safety of contact with the patterns 161 to 163 on the signal board 160. The actual sliding position of the sliding portion 130a, that is, the contact point is a position 130b on a line slightly inside the tip of the brush.

FIG. 8 (a) shows the phase of detecting the completion of shutter charge corresponding to FIG. 7 (c).
130 rotates clockwise as indicated by the arrow in response to the clockwise rotation of the mirror drive gear 126, and in the state of FIG. 162, and the potential of the connector portion (land portion) 162a of the detection pattern 162 changes to the ground level, thereby detecting the completion of the shutter charge. To explain this detection in more detail, a ground level signal is supplied to the connector portion (land portion) 161a of the ground pattern 161.
The output of the second connector section 162a is supplied to the camera control circuit. Then, when the brush 130 is at a position before the state of FIG. 8A (can be understood by replacing the brush 130 with a position rotated counterclockwise from the position of FIG. 8A). In other words, the sliding portion 130a of the brush 130 is in contact only with the ground detection pattern 161, and the detection pattern 162 has not yet changed to the ground level. Then, from here, the mirror driving gear 126 further rotates clockwise, and at the same time, the brush 130 also rotates clockwise, and when the brush 130 (conductive material) reaches the position shown in FIG. Came into contact with the pattern 162,
The potential of the operation end detection pattern 162 changes to the ground level via the brush 130, and the camera control circuit detects the shutter charge completion state, and controls the rotation of the motor M1 to stop.

On the other hand, FIG. 8 (b) shows the phase in which the mirror up completion corresponding to FIG. 7 (b) is detected, and the brush 130 turns to the arrow in response to the clockwise rotation of the mirror driving gear 126 as well. As shown in FIG. 8 (a), the sliding portion 130a is rotated clockwise from the state shown in FIG. 8 (a), and the sliding portion 130a is contacted by both the ground pattern 161 and the operation end detection pattern 162 in the state shown in FIG. The detection pattern 162 is switched to non-contact, and the completion of the mirror-up is detected by changing the potential of the connector portion (land portion) 162a of the detection pattern 162 from the ground level to the initial level (normally H level). This detection will be described in further detail. It is understood that the brush 130 is replaced by a position just before the state shown in FIG. 8B (a position where the brush 130 is rotated counterclockwise from the position shown in FIG. 8B). Is possible), the sliding portion 130a of the brush 130 is in contact with both the ground pattern 161 and the operation end detection pattern 162, and the output of the connector portion 162a of the operation end detection pattern 162 is still output from the camera control circuit. Is supplied with a ground level signal. Then, from here, the mirror driving gear 126 further rotates clockwise, and at the same time, the brush 130
When the brush 130 also rotates clockwise and reaches the position shown in FIG. 8B, the brush 130 shifts to a non-contact state with the operation end detection pattern 162, and the potential of the operation end detection pattern 162 changes from the ground level. The level changes to the initial level, and the camera control circuit detects the mirror up completion state, and controls the rotation of the motor M1 to stop.

FIGS. 2 and 7 show a switching mechanism of the above-described film winding, rewinding, mirror driving and charging mechanisms.
Description will be made with reference to the drawings.

Reference numeral 170 denotes a switching lever, which is indicated by a two-dot chain line in the figure (to avoid complicating the figure). This switching lever 17
Numeral 0 is supported so as to be swingable about a central shaft 170a, and a first regulating protrusion 170b is formed at an upper end and a second regulating protrusion 170c is formed at a lower end. A spring 172 urges the switching lever 170 to swing clockwise. A tensioning lever 174 is swingably supported on the switching lever 170, and has a latch claw 174a at one end and a protrusion 174b at the other end. Reference numeral 176 denotes a spring for urging the tensioning lever 174 counterclockwise, one end of which is locked by the switching lever 170, and the other end of which is locked on the tensioning lever 174. In addition, this tensioning lever 1
In the initial state (see FIGS. 2 and 7A), the latch pawl 174a is locked by a tensioning projection 170d formed on the switching lever 170, and receives the urging force of the spring 176 to lock the latch. Is continued. On the other hand, the protruding portion 174b of the tensioning lever 174 is located within the movement trajectory of the pushing protruding portion 132c formed on the mirror driving lever 132, and as shown in FIG. When the mirror driving lever 132 swings counterclockwise, the projection 174b is pushed by the pushing projection 132c, and the tension lever 174 swings clockwise to release the tension.
In this state, the switching lever 170 swings slightly clockwise to the position shown in FIG.

178 is a reset lever (second
FIG. 9, FIG. 9), in which a protruding portion 178a is formed at one end and a pushing protruding portion 178b is formed at the other end. This reset lever 17
8 is oscillated clockwise by a strong spring 180.
The strong spring 180 is set to have a stronger spring force than the spring 172 for urging the switching lever 170 to swing.
Therefore, when the back cover 70 is closed, the reset lever 178 is held in the state shown in FIGS. 2 and 9 (a) by the protrusion 178a being pushed by the pushing protrusion 70d.
Is allowed to swing clockwise. However, the back lid 70
When the push is released by the opening of the reset lever 178
Swings counterclockwise. At this time, the switching lever 170, which has already swung clockwise by the spring 172, is swung counterclockwise against the spring 172 to return to the initial state shown in FIG. Let it return. When the switching lever 170 returns to the initial state, the tensioning lever 174 is connected to a guide projection 170e having a cam surface formed on the back side of the switching lever 170 by a pin 174c formed on the lever 174. By being guided,
The latch pawl 174a is guided to be locked by the tensioning projection 170d. After this, even if the back cover 70 is closed and the reset lever 178 is swung again,
70 is held in the initial position.

The role of the switching lever 170 will be described with reference to FIGS. 9 and 10.

When the switching lever 170 is at the initial position shown in FIGS. 2 and 7A, the first regulating projection 170b at the upper end is inserted between the planetary gear 106 and the rewind gear 110 (FIG. 9). (See (a)), and the second regulating portion 170c at the lower end is a planetary gear.
It is separated from between the transmission gear 28 and the transmission gear 32 (see FIG. 10 (a)). Therefore, in this state, the rotation of the motor M1 in the clockwise direction allows the planetary gear 28 to revolve in the direction meshing with the transmission gear 32 and perform film winding.However, the planetary gear 106 rotates in the direction meshing with the rewind gear 110. Revolution is the first
The film rewinding is prohibited by the prohibition (the center shaft 106a of the planetary gear 106 abuts on the first restricting portion 170b during the revolution) by the restricting portion 170b. However, the rotation of the motor M1 in the counterclockwise direction is not affected by the first regulating portion 170b,
The planetary gear 106 can revolve in a direction in which the planetary gear 106 meshes with the transmission gear 120, whereby mirror drive and charge drive are performed.

On the other hand, when the switching lever 170 swings clockwise as shown in FIGS. 7 (b) and 7 (c), the first regulating projection 170b at the upper end of the planetary gear 106 and the rewind gear 110 9 (b) and 9 (c), and the second restricting portion 170c at the lower end enters between the planetary gear 28 and the transmission gear 32 (FIGS. 10 (b) and (b)). c)). Therefore, in this state, the rotation of the motor M1 in the clockwise direction allows the planetary gear 106 to revolve in the direction in which it meshes with the rewinding gear 110, thereby performing film rewinding. However, the planetary gear 28 is in the direction in which it meshes with the transmission gear 32. Is prevented by the second restricting portion 170c (the center shaft 28a of the planetary gear 28 abuts on the second restricting portion 170c while revolving), thereby preventing film winding. Note that even in this state, the rotation of the planetary gear 106 and the transmission gear 120 due to the counterclockwise rotation of the motor M1 can be performed.

 Next, the camera control circuit will be described with reference to FIG.

In the figure, CPU is a micro computer, and BAT is a battery. SW1 is a power switch for turning ON the first stroke pressing of the release button 2 (see FIG. 1), via a diode D _SW1 and the resistor R ₂ ON the transistor TR _BAT by ON of the power switch SW1, the circuit Power supply to is started. The output of the power switch SW1 is supplied to the input port SW1 of the microcomputer CPU. Transistor TR _BAT also through the diode D _OS and resistor R ₂ by a constant time operation accompanied Wanshiyotsuto circuit OS to ON (closed) described later back cover switch SW _BP is turned ON. When the back cover is closed, the transistor TR _BAT is turned on.When the camera is loaded with the film and the back cover 70 is closed, the film loading and the film are wound in advance for all frames.
The purpose is to supply power to the microcomputer CPU in order to control the so-called preliminary winding system.
The transistor TR _BAT is a micro computer CPU.
There the output port VON becomes operational state if a H, is held via the inverters I ₁ and a resistor R ₂ to the ON state.

In the figure, REG is a regulator, which is connected to the collector output of the transistor TR _BAT and supplies a stable constant voltage Vcc to each circuit (in the figure, the constant voltage Vcc performs an input port Vcc of the micro computer CPU and a photometric operation). Analog circuit MET). MET is an analog circuit that performs a photometric calculation, calculates Bv-Av between subject brightness information (Bv) obtained by a photometric sensor SPC and a resistance R _AV corresponding to preset aperture value information (Av), and outputs BV. It is configured to input information as ₁ out to an input port AD _IN1 as an AD conversion input of the microcomputer CPU. R _ISO is the resistance corresponding to the film sensitivity information S _V, are information input to the input port AD _IN2 of the microcomputer CPU. V _BAT is a battery voltage of the battery BAT, and is supplied to the input port AD _IN3 of the microcomputer CPU and a transistor bridge circuit MD described later.

SWPT _IN is a film loading detection switch, which is composed of, for example, a leaf spring disposed in a camera patrone room,
When the film cartridge is loaded in the cartridge chamber, the leaf spring is pressed to turn on the switch to detect the film loading.The output of this switch is supplied to the input port PT _IN of the micro computer CPU. I have.

SWBP is a back cover switch, which turns on when the back cover 70 (see Fig. 2) is closed, turns off when the back cover 70 is closed, and is used for the micro computer.
The output is supplied to the input port BP of the CPU and the one-shot circuit OS.

SW _CMSP is the brush 1 on the signal board 160 (see Fig. 8).
This means a switch associated with the sliding between 30 and the operation end detection pattern 162. The time when the output changes from L to H is the mirror up (shutter charge release) phase, and the time when the output changes from H to L is the mirror. Down (shutter charge) phase, this output is a micro computer CP
It is supplied to the U input port CMSP.

SW _FLSP and SW _FLDY mean a switch for detecting the rotation of the detection gear 84 (see FIGS. 2 and 4). The switch SW _FLSP is connected to the output of the terminal 95 of the detection board 94 (see FIG. 5). A corresponding switch output is supplied to the input port FLSP of the microcomputer CPU, and a switch SW _FLDY supplies a switch output corresponding to the output of the terminal 97 to the input port FLDY.

SW2 is ON when release button 2 is pressed for 2nd stroke
Release switch, and outputs its output to the input port SW.
Supplying two.

The LED is a light emitting diode for warning, which is installed near the field of view of the viewfinder or on the exterior of the camera.
Output port LED of microcomputer CPU via the R _BC
Is connected to

MD is a well-known transistor bridge circuit, and a motor
M1 (see FIG. 2) is controlled as instructed by the microcomputer CPU, and is connected to output ports PM0 and PM1.

MG1 is a magnet for the shutter tip blade group, and is configured to start running of the shutter tip blade group by energization.Specifically, by setting the output port PS0 of the micro computer CPU to H, the resistance R _MG1 is set. The transistor TR _MG1 is turned on via the power supply to turn on the magnet MG1. MG2 is a magnet for the rear blade group of the shutter.
It is configured to start the running of the rear group of shutters by energization.Specifically, by setting the output port PS1 to H, the transistor TR _MG2 is turned on via the resistor R _MG2 to energize the magnet MG2. Will be

DATE is a publicly known date imprinting device, which imprints data such as date and day of the week on the film surface from the back cover 70 side, and this imprinting operation is performed by setting the output port DTON of the micro computer CPU to H. Done.

 In the drawing, GND means ground.

Next, the operation of the camera control circuit will be described with reference to the flowcharts of FIGS.

(Preliminary winding) [Step 1] When the microcomputer CPU receives power, the program is executed from the start address START.

[Step 2] Set the output port V _ON to H (V _ON = 1) and set the transistor
The power holding control is performed by keeping TR _BAT ON.

[Step 3] It is determined whether or not a film is loaded in the camera based on the output of the film loading detection switch SWPT _IN. If a film is loaded, the process proceeds to Step 4, and if the film is not loaded, the process proceeds to Step 5.

[Step 4] Whether or not the back cover 70 is closed is determined based on the output of the back cover switch SWBP, and if it is closed, Step 7 is performed.
If so, proceed to the RELEASA routine of step 50.

[Step 5] In the same manner as in Step 4, the back cover step SWBP is detected and the back cover is detected.
If 70 is closed, go to step 6; if it is open, go to the RELEASA routine of step 50.

[Step 6] The microcomputer CPU has a built-in EEPROM (non-volatile memory). One bit in the EEPROM is EF
Use it as a P flag, and set 1 to this flag.
As will be described in detail in a sequence described later, the EFP flag is used as a determination flag for determining whether or not to execute the preliminary winding when the back cover 70 is closed.

After setting 1 on the EFP flag, REL at step 50
Proceed to EASE routine.

[Step 7] In the initial state where the EFP flag is set to 1 (state in which preliminary winding is executed) (EFP = 1), go to step 8; in the state where preliminary winding is prohibited (EFP = 0). Proceed to the RELEASE routine of step 50.

[Step 8] The voltage VBAT of the battery _BAT is checked based on the analog input of the input port _ADIN3 (AD conversion input). The voltage _VBAT is AD-converted by the AD converter in the micro-computer CPU. If the voltage is lower than the predetermined voltage, the camera may malfunction, so the process proceeds to step 9 and exceeds the predetermined voltage. If there is no problem, go to step 10.

[Step 9] With the output port LED set to H, the warning light emitting diode LED is turned on to indicate that the battery voltage V _BAT has dropped and the camera cannot be operated. Note that this command also includes a function of automatically turning off the light emitting diode LED by setting the output port LED to L again after a predetermined time. Then, the process proceeds to a STOP routine of step 47.

[Step 47] At the end of every sequence, this routine is always passed.

The output port V _{ON is set} to L (V _ON = 0), whereby the transistor TR _BAT is turned off and the regulator REG is also deactivated, thereby turning off the circuit power supply.

Also wait for time. Usually a microcomputer
The power supply Vcc is turned off while the CPU waits for this time.

Note that the power supply Vcc may still exist even after the waiting time has ended. That is when the transistor TR _BAT is turned on due to a factor other than the output of the output port V _ON , specifically when the one-shot circuit OS is operating by turning on the power switch SW1 or turning on the back cover step SWBP. It is. In such a state, the process returns to step 1 as a start address and executes a new sequence.

[Step 10] the film is loaded, the back lid is closed, EFP Furatsugu is 1, further when is at a level the battery voltage V _BAT is no problem in operation performs winding preliminary film.

That is, the drive sprocket 58 and the spool 52 are driven by rotating the motor M1 forward (clockwise rotation in FIG. 2), and the film leader is first spooled.
52 is loaded, and then preliminary winding control is performed to wind up the film for all frames.

Here, the operation control of the motor M1 by the micro computer CPU is performed as shown in the following table.

Also, the timer TMR is reset (TMR = 0). This timer TMR is used to detect a state in which the film cannot be accurately loaded, or a state in which the preliminary winding of all the frames of the film is completed and the film is in a state of being stretched. If the film does not move, and if the film has not moved by the predetermined amount within the time set by the timer TMR, it can be determined that the above-mentioned two states have occurred.

In addition, registers VR and VNR for a battery voltage check, which will be described later, are initialized (VR = 0, VNR = 0).

Also, the register E _COUNT of the EEPROM (non-volatile memory) in the micro computer CPU is initialized (E _COUNT =
0). The register E _COUNT is used as an electric film counter.

[Step 11] The state of the back cover switch SWBP is checked to determine whether or not the back cover 70 has been opened during the preliminary winding. When the back cover is opened, the process proceeds to step 12, and when the back cover is kept closed, the process proceeds to step 13.

[Step 12] If the back cover 70 is opened during the preliminary winding, the motor M1 is stopped to stop the preliminary winding, and
Proceed to the STOP routine. When the back lid 70 is closed again,
Since the EFP flag is not reset and still stands at 1,
The program proceeds from START in step 1 to step 1.
The preliminary winding operation of 0 is executed again. However, register E
_{Since COUNT} is reset to 0, R in step 50 described later
Shooting in the film area of the preliminary winding section performed up to the present in the ELEASA routine can be automatically prohibited.

[Step 13] The state of the input port FLSP of the micro computer CPU is checked whether or not the film has been moved by preliminary winding. If there is a change in the supply signal to the input port FLSP, the process proceeds to step 14; otherwise, the process proceeds to step 22.

[Step 14] Since the film is moving due to a change in the supply signal to the input port FLSP, the timer TMR for detecting the stop of the film is initially reset (TMR = 0).

[Step 15] Add the contents of the register VR to the value AD _IN3 obtained by digitally converting the analog voltage of the input port AD _IN3 for battery voltage detection by the AD converter in the microcomputer CPU, and store it in the register VR again. Yes (VR = VR + A
D _IN3 ). Since the resist VR is initially reset by the step 10, the voltage value is added each time the supply signal of the input port FLSP changes by the step 13, and as a result, it is stored again in the register VR.

In addition, the contents of the register VNR are incremented by one ( _INC
VNR). As will be described later, the number of additions of the voltage value added to the register VR is represented in the register VNR.

[Step 16] Check the status of input port FLDY. When an H-level signal is supplied to the input port FLDY, that is, during a period other than the brake control section and the duty control section of the brush 85, the process returns to step 11, while an L-level signal is supplied to the input port FLDY. That is, in the brake control section and the duty control section, the process proceeds to step 17.

In the time chart shown in FIG. 6, the time direction is from right to left during the preliminary winding operation.

[Step 17] Check whether the supply signal to the input port FLSP is H or L. When the signal is at the H level, go to step 18;
Proceed to 19.

Now, referring to the time chart of FIG. 6, the signal of the preliminary hoisting operation changes with time from the right side to the left side. If the operating state reaches the right side of the brake control section, steps 13, 14, The flow will proceed with 15, 16, and 19.

[Step 18] When the brush 85 enters the duty control section from the brake control section, the supply signal to the input port FLSP changes from L level to H level, and in this state, the register E _COUNT as an electric film counter is set to 1 Increment, then return to step 11. This means that when the brush 85 moves from the brake control section to the duty control section during the preliminary winding operation, the register E _COUNT is incremented by one, and the number of film frames is increased by a mechanical counter (counter gear).
It is counted independently of 88).

[Step 19] Obtain the average value of the voltage in step 15 (V = VR ÷ VN
R).

This is when the brush 85 enters the brake control section,
Each time the supply signal to the input port FLSP changes up to that time, the power supply voltage obtained by calculation (VR = VR + _ADIN3 ) is averaged, and when the battery voltage _VBAT becomes unusable, the following steps are taken. Stop driving the motor M1.

The purpose of averaging in step 19 is
The purpose is to cancel the power supply noise during the driving of M1.

[Step 20] It is checked whether the voltage V obtained in step 19 is higher than a predetermined value M. If the voltage V is higher than the predetermined value M and there is no problem in the operation of the camera, the process returns to step 11;
If the voltage is equal to or less than the predetermined value M and the battery BAT is determined to be unusable, the process proceeds to step 21.

At the initial time of the preliminary winding, the influence of the power supply noise increases. However, if the register VNR is not equal to or longer than the predetermined time, the process automatically returns to step 11, so that no problem occurs.

[Step 21] The motor M is stopped to stop the preliminary winding operation, the warning light emitting diode LED is turned on, and then the process proceeds to the STOP routine. In this case, if the power is turned on again,
Or, if you replace the battery BAT with a new one,
Since the content of the ROM has been stored, the preliminary winding operation is performed again.

[Step 22] If there is no change in the supply signal to the input port FLSP in Step 13, the state of the timer TMR is checked and the predetermined value K
If not, return to Step 11 and return to Step 1.
The routines 1, 13, and 22 are repeated. On the other hand, if the supply signal does not change even if the predetermined value K is counted, the process proceeds to step 23.

As a discrimination value "3" as the [step 23] value, the register E value at greater than 3 _COUNT as an electrical film counter proceeds to step 24 it is determined that the normal, to the spool 52 when the 3 following Proceed to step 12 as loading failure and stop the motor M1.

When the film is loaded onto the spool 52 by the preliminary winding operation, the entire film can be wound, and the film is stretched in that state.
Proceed to the routine that branches to 23. However, the film does not move even if the film is not properly loaded and the film cannot be loaded onto the spool 52 in the early stage of the preliminary winding, so that the process branches from step 22 to step 23 in the same manner as in the case of the above-described thrust. The routine will proceed. Step 23 is intended to determine in what state the film does not move. That is, when the register E _COUNT is larger than 3, it is determined that the film cannot be moved due to the strut (normal),
If the register E _COUNT is 3 or less, it is determined that the film cannot be loaded onto the spool 52 and the film does not move (abnormal).

Note that step 12 cannot be performed because loading cannot be performed.
When the motor M1 is stopped by proceeding to, the photographer can determine the abnormal state by the mechanical film counter (counter gear 88), and can load the film again.

[Step 24] An EFP flag used as a determination flag for determining whether or not to execute the preliminary winding is set to a state in which the preliminary winding is prohibited (EFP = 0). Therefore, in the next sequence, step 50 is performed in step 7.
And the process does not proceed to the preliminary winding routine described above.

[Step 25] Since the preliminary winding has been normally performed, the motor M1 is stopped to end the preliminary winding operation.

[Step 26] Counter gear 88 as a mechanical film counter
And register E as an electrical film counter
The phase of _COUNT is adjusted so as to add or subtract at the switching point between the brake control section of the brush 85 and the duty control section.

Here, consider a state in which the brush 85 slightly shifts from the brake control section to the duty control section at the end of the preliminary winding operation (film tension). in this case,
Finally, the mechanical and electrical counters are each incremented by one at the switching point. However, when the driving (energization) of the motor M1 is stopped, the film may slightly return to the cartridge side due to tension, and the driven sprocket 80 may be rotated slightly in the rewinding direction. At this time, when the position of the brush 85 returns to the brake control section, the counter gear 88 as a mechanical counter is intermittently fed (reduced by 1) in the rewind direction by one frame, but the register E as an electric counter is shifted. _COUNT is overlooked, and one count error occurs between the two. As a result, if the photographing is performed while rewinding the film thereafter, the photographing will be executed even to the frame which cannot be photographed, that is, the photosensitive portion in the preliminary winding.

Thus, step 26 to 30 by matching the value of the register E _COUNT in the final pre-winding the counter gear 88, a routine that aims to solve in advance the above problems.

In step 26, the supply signal to the input port FLDY is determined. If L, the process proceeds to step 27, and if H, the process proceeds to step 31.

[Step 27] The supply signal to the input port FLSP is determined. If the signal is H, the process proceeds to Step 28; if the signal is L, the process proceeds to Step 31.

[Step 28] Waiting for time. A sufficient time required for the film to return to the patrone direction by the film tension is set.

[Step 29] After waiting for the time in step 28, re-enter the input port
Check the status of the supply signal to FLSP. Where input port FL
If the supply signal to SP remains H and there is no change,
If it is determined that the above-mentioned phenomenon has occurred (the mechanical counter has been rotated in the rewinding direction by one frame due to the film tension), the flow proceeds to step 30.

[Step 30] The value of the register E _COUNT as an electric film counter is decremented, that is, decremented by 1, and the mechanical film counter and the electric film counter are adjusted.

[Step 31] Reverse the motor M1. The reverse rotation of the motor M1 (counterclockwise rotation in FIG. 2) causes the planetary gear 106 to rotate.
Is meshed with the transmission gear 120 of the mirror drive / charging drive system to rotate the mirror drive gear 126 and the shutter charge gear 142 to release the holding of the initial position by the tensioning lever 170 and swing the switching lever 170. (Transition to FIG. 7 (c)). Thus, when the motor M1 rotates forward again thereafter, the output is transmitted only to the film rewinding system.

[Step 32] Looking at the state of the supply signal to the input port CMSP, the process proceeds to step 33 when the level changes from the L level in the initial state to the H level.

[Step 33] As the motor M1 continues to rotate in the reverse direction, the process goes to step 34 when the supply signal to the input port CMSP changes to the L level again.

[Step 34] Stop the motor M1 once. Steps 32 and 33 are motor M
This is a step for detecting the end of the empty charge due to the reversal of 1.The phase in which the signal supplied to the input port CMSP is switched from L level to H level indicates that the mirror-up and shutter charges have been released, and the H level has been released. The phase switched to the L level indicates a mirror down shutter charge. Therefore, at the time when the process reaches the step 34 through the steps 32 and 33, one empty charge has been performed.

Next, the motor M1 is rotated forward again. However, at this time, the output of the motor M1 is transmitted to the film rewinding system by the swing of the switching lever 170. That is, the planetary gear 106 meshes with the rewind gear 110, and the rewind gear 110 is driven by the motor M1.

[Step 35] Initially reset the contents of the register P _COUNT (P _COUNT =
0).

[Step 36] In the initial stage of film rewinding, the state of the supply signal to the input port FLSP is determined in order to see the position of the brush 85.
If it is in another section (for example, a duty control section), it becomes H, and the process proceeds to step 37.

[Step 37] Whether the brush 85 is at the original position is also determined by the supply signal to the input port FLDY, and when H (the brush 85 is in a state other than the brake and the duty control section), the process proceeds to step 40.
In the case of L (when it is determined that the brush 85 is in the duty control section together with the determination in step 36), step 38
Proceed to.

[Step 38] Since it is determined that the brush 85 is located in the duty control section at the beginning of film rewinding, the value of the register E _COUNT as an electric film counter is decremented by one.

The time chart shown in FIG. 6 advances from the left to the right during the film rewinding operation.

[Step 39] The flow waits until the supply signal to the input port FLDY becomes H (the brush 85 is located in a period other than the duty and brake control section), and then proceeds to step 40.

[Step 40] Looking at the state of the input port FLSP, if there is a change in the supply signal, proceed to step 41, otherwise proceed to step 42.

[Step 41] The value of the register P _COUNT that has been reset initially is incremented by one, and the process returns to step 40 again.

[Step 42] Looking at the state of the input port FLDY, if the supply signal is H, the process returns to Step 40, and if it is L, the process proceeds to Step 43.

Until step 40 to 42, are intended to store the number of signal input ports FLDY is supplied to the input port FLSP between H (interdigital pattern 94a shown in FIG. 5) in the register P _COUNT.

[Step 43] The value of the register P _COUNT is compared with a predetermined value M. If the value is smaller than the predetermined value M, the process returns to step 35, and if it is equal to or more than the predetermined value M, the process proceeds to step 44.

In the routine of this embodiment, when the preliminary winding operation is completed, the phase of the exposure frame of the film and the rotational position of the driven sprocket 80 (that is, the rotational position of the brush 85) are adjusted.
The film is designed to be rewound in advance. However, if the rewind amount is small, when cutting the film from the film cartridge at the stage of the film development processing,
It can be expected that the exposure (photographing) frame may be reached. This step 43 is enough to ensure that no problems occur,
The purpose is to rewind the film. That is, the amount of time from the initial state of film rewinding to the time when the brush 85 reaches the duty control section is determined by replacing it with the number of comb tooth patterns 94a (FIG. 5) actually sliding on the brush 85. Is smaller than the predetermined value M, it is determined that the rewinding amount is too small, so that rewinding is performed by another frame and then the actual shooting is performed.

[Step 44] In order to keep the overrun from the start of the brake control until the motor M1 actually stops, the motor M1 is duty-controlled just before the brake section. Since the duty control of the motor itself is publicly known, a detailed description is omitted.
This means that the motor M1 is energized in an alternating pulse shape without full energization to lower the effective voltage and apply braking.

[Step 45] While the brush 85 is moving in the duty control section, the duty control of the motor M1 is performed, and it is determined that the motor has entered the brake control section by the change of the supply signal to the input port FLSP to L. At this point, the process proceeds to step 46.

[Step 46] Brake control the motor M1. And register E
Decrements the value of _COUNT by 1 (subtracts 1).

Now that all the preparations for shooting have been completed in the routine up to this point, the process proceeds to the SOTP routine.

(Step 50) Except for the pre-winding control, the RELEASE routine is executed.

[Step 51] Store the digital value AD _IN1 obtained by AD-converting the analog signal from BV1 _OUT as the output of the photometric operation circuit MET by the microcomputer CPU into the register BV1 (BV1 = A
D _IN1 ). The value of VB-AV in terms of the apex value is stored in the register BV1.

Also, the digital value AD which is obtained by converting the film sensitivity to AD
Store _IN2 in register SV (SV = AD _IN2 ). The SV value at the avex value is stored in the register SV.

Further, based on the store information of the register BV1 and the register SV, the shutter time is obtained (TV = BV1 + SV) and stored in the register TV. The contents of the register TV are the TV of the apex value.

[Step 52] The state of the release switch SW2 which is turned on by pressing the second stroke of the release button 2 is determined, and the process proceeds to step 53 only when the release switch SW2 is turned on.

[Step 53] in the same manner as step 8, and a checking voltage V _BAT of the battery BAT, in the case was less than the predetermined voltage proceeds to step 54, if it exceeds the predetermined voltage proceeds to step 55.

[Step 54] Similarly to step 9, the output port LED is set to H, and the warning light emitting diode LED is turned on to indicate that the battery voltage V _BAT has dropped and the camera cannot be operated.

[Step 55] The motor M1 is rotated in the reverse direction to release the mirror up and shutter charge.

[Step 56] Until the H supply signal is obtained at input port CMSP,
M1 is reversed, and the process proceeds to the next step 57. As a result, the mirror driving gear 126 and the shutter charge gear 142 are driven, the movable mirror 134 is mirror-up (exposure retreat state), and the shutter is released and the shutter becomes operable.

[Step 57] Perform brake control to stop motor M1.

[Step 58] The apex value TV obtained in step 51 is converted to the actual shutter time (real time extension).

[Step 59] With the output port DTON set to H, the data imprinting device DATE starts data imprinting on the film surface.

Since the date imprinting device itself is publicly known, detailed illustration is omitted, but, for example, a plurality of Japanese character-shaped LCD segments are arranged side by side and provided at a position facing the film surface on the back cover side, and a transmission place of this segment is selected. The film surface is exposed as numerical or character information such as date and time.

Start the timer DTMR for imprint time. The content of this timer DTMR is a register in which the film sensitivity is stored.
This value depends on the contents of the SV. However, since the value SV as the content of the register SV is an apex value, the value α × 2β ^−SV (α and β are constants) converted into real time is the content of the timer DTMR.

Here, the timer interrupt of the timer DTMR is permitted (ENI). After this, when the timer time of the timer DTMR expires, an interrupt is applied independently of the main routine program. In the interrupt routine, DTON = 0, the output port DTON is switched to L, and the DTMR / STOP timer DTMR is stopped. By executing Return, the printing ends.

[Step 60] With the output port PSO set to H, power is supplied to the magnet MG1 for starting the group of shutter leading blades. As a result, the group of shutter leading blades travels to start exposing the film.

In addition, the actual time at the shutter second obtained in step 58 is actually counted. This time is the exposure time.

When the real-time counting ends, the output port PS1
Is set to H, the magnet MG2 for starting the rear shutter blade group is energized, whereby the rear shutter blade group is driven to stop the exposure of the film.

[Step 61] Wait for the time required for the rear blade group to run.

[Step 62] With both output ports PS0 and PS1 set to L, both magnets MG1 and M
Turn off the power to G2.

[Step 63] Motor to perform mirror down and shutter charge
Reverse M1.

[Step 64] Until the L supply signal is obtained at the input port CMSP,
M1 is reversed, and the process proceeds to the next step 65. By this, the mirror drive gear 126 and the shutter charge gear 1
42 is driven, the movable mirror 134 is mirror-down (the finder observation state), and the shutter is charged.

[Step 65] Perform the brake control to stop the motor M1.

Even if the output port DTON is H again (timer
DTMR timer time has not expired yet), forced L
To end the data imprinting (DTON = 0). This means that if the film speed becomes very low, the imprint may not be completed within the charge time. However, when the charge ends, the film is rewound for the next frame in the next step, so that if the photographic operation is continued as it is, the photographic numerals and characters will flow. In this step 65, if the imprinting is still continuing even when the charging is completed, the imprinting is forcibly terminated to prevent the flow of the imprinted numbers and characters. Also, the interrupt is disabled, and the subsequent interrupt is prohibited (D1SI).

[Step 66] Input state of SWPT _IN state of film load detection switch
The determination is made based on the supply signal to PT _IN . If the film is not loaded at H level, the process proceeds to step 67, and if the film is at L level, the process proceeds to step 68.

[Step 67] After waiting a standard time required for rewinding one frame of the film, the process proceeds to the STOP routine. The purpose is not to rewind the film when the film is not loaded.When the user operates the continuous shooting at the camera shop, the frame speed will be faster than when shooting with the film loaded. It is to prevent the user from giving the wrong specification to the user.

[Step 68] Rewind the film by rotating the motor M1 forward for the next frame.

[Step 69] Wait until the supply signal to the input port FLDY becomes H, and then proceed to step 70. That is, at the start of the normal rotation of the motor, the brush 85 is in the phase of the brake control section.

[Step 70] Wait until the supply signal to the input port FLDY becomes L, and then proceed to Step 71. That is, it waits for the brush 85 to enter the duty control section.

[Step 71] Perform the duty control of the motor M1.

[Step 72] Wait until the supply signal to the input port FLSP becomes L, and then proceed to step 73. That is, it waits for the brush 85 to enter the brake control section.

[Step 73] Since the brush 85 has entered the brake control section, the register E _COUNT as an electrical film counter is decremented by 1 (DEC E _COUNT ) [Step 74] The value obtained by subtracting the register E _COUNT is “2” Otherwise, the process proceeds to step 75, and if the value is "2", the process proceeds to step 76. That is, when the register E _COUNT is “2”, the process proceeds to a different routine to control the end of photographing. Here, when the register E _COUNT is 2, the counter gear 88 as a mechanical film counter indicates "0" (a state in which the number "0" of the film frame number display 88c corresponds from the display window 89 provided on the camera body). ). In the display 88c of the counter gear 88, the mark "E" corresponds to the display window 89 at the time of starting the preliminary winding, and the photographable film area is three frames ahead of the mark "E". Register E
_{Since COUNT} is set to "0" at the time of the mark "E", the film area (frame) that can be photographed is up to _ECOUNT = 3.

[Step 75] Since the register E _COUNT is not “2”, it can be determined that there are still photographable frames in the film, so the motor M1 is braked to stop film rewinding. Thereafter, the process proceeds to the STOP routine, and waits for the next frame to be photographed.

 During normal shooting, this routine determines the end of shooting.

[Step 76] Since the register E _COUNT is "2", it means that all of the photographable frames have been photographed, so that the motor M1 continues to rotate forward in order to control the film to be wound around the film cartridge.

[Step 77] The timer TMR for detecting the stop of the film is initialized (TMR = 0).

[Steps 78 and 79] As in steps 13 and 22, when the film is no longer moved, the process proceeds to the next step 80. The fact that the movement of the film is stopped in these steps 78 and 79 means that the film is wound in the film cartridge.

[Step 80] Apply a brake to the motor M1 to stop the film rewinding operation.

[Step 81] The motor M1 is rotated in the reverse direction to perform an empty charge.

[Steps 82 and 83] Similarly to the steps 32 and 33, the motor M1 is continuously rotated until the mirror drive gear 126 and the shutter charge gear 142 make one rotation. This empty charge is transferred to the planetary gear 106 meshed with the rewind gear 110 by the film rewinding operation.
The main object is to allow the switching lever 170 to swing to the initial position thereafter.

[Step 84] Brake the motor M1 to end the empty charge operation. Then, 1 is set to the flag EFP as a determination flag for determining whether or not to execute the preliminary winding (E
FP = 1), the preparation for the preliminary winding control at the time of loading the next film is performed.

Also, register E as an electrical film counter
The _COUNT to initial reset (E _COUNT = 0).

Then, the process proceeds to the STOP routine of step 47, and the control is terminated.

Next, the camera operation centering on the movement of the mechanical mechanism will be described.

(Preliminary Winding Operation) The present embodiment employs a preliminary winding system in which the film is wound up by all frames prior to photographing, and the film is rewound by one frame for each photographing.

When it is determined by the ON of the back cover step SW3 that the film cartridge has been loaded and the back cover 70 has been closed, the micro computer CPU rotates the motor M1 clockwise (hereinafter referred to as forward rotation).

The forward rotation of the motor M1 causes the planetary gear 28, which is the transmission system on the lower output shaft side, to mesh with the transmission gear 32 by revolving (see FIG. 10 (a)), and the sun gear 38 via the transmission gears 34 and 36. Rotate clockwise. The rotation of the sun gear 38 first meshes with the transmission gear 48 for driving the spool by the revolution of the first planetary gear 40, and the second planetary gear 46 meshes with the transmission gear 54 for driving the sprocket by revolution. Third
As shown in FIG. 7A, both the spool 52 and the drive sprocket 58 are rotated in the film winding direction. As a result, the leader part of the film F is initially driven sprocket.
It is sent to the spool 52 by 58, and the perforation is wound around the spool 52 by meshing with the spool claw 52a.

The planetary gear 106, which is a transmission system on the output shaft side above the motor M1, tries to move in the direction of meshing with the rewind gear 110 by revolving. In this state, however, the first restricting projection 170b of the switching lever 170 is used. It is merely stopped and idle (see FIG. 9 (a)).

When the leader portion of the film F is wound on the spool 52, the peripheral speed ratio between the transmission system on the spool side and the transmission system on the drive sprocket side is different.
The number of rotations of the transmission gear 54 (rotated by the drive sprocket 58 driven by the movement of the film) and the transmission gear 54 (rotated by the drive sprocket 58) do not match, and the second planetary lever 44 jumps clockwise (in FIG. 3). . Then, the second planetary lever 44 is moved clockwise by a click clock 44C.
Moves over the click projection 62b of the holding lever 62, and is held in a state where the second planetary gear 46 is disengaged from the transmission gear 54 (see FIG. 3 (b)). As a result, the subsequent film winding is driven only by the spool 52. According to this method, the film F can be automatically loaded. That is, the film leader cannot be reliably fed to the spool 52 by simply driving the spool 52 from the beginning, and it is certain that the film F can be driven by the driving sprocket 58 until the film leader is wound around the spool 52. It has a great advantage for performing automatic loading.

After the film leader is wound around the spool 52, there is no point in driving the drive sprocket 58, so that the drive can be automatically switched to the drive of the spool 52 only. It is big. It is desirable to set the peripheral speed ratio between the spool 52 and the drive sprocket 58 so that the above-described holding of the second planetary lever 44 is performed immediately after the film leader is completely wound around the spool 52.

Thereafter, the film winding is continued until all the film frames have been wound. The state of this winding can be confirmed by the photographer by the intermittent feed rotation of the counter gear 88 based on the driven rotation of the driven sprocket 80. As described above, the counter gear 884 is provided with a film frame number display 88c, and a display window 89 (second display) provided in the camera body.
It can be understood that the film F has been wound up by observing the change in the number associated with the display 88c from the area surrounded by two dotted lines in the figure.

When the film F is wound up and stretched by the entire frame, the rotation of the detection gear 84 interlocked with the driven sprocket 80 stops, whereby the signal indicating the movement of the film which has been continuously sent from the detection board 94 to the microcomputer CPU (the sixth signal). (See figure)
Is not output, and the completion of winding of the film F is detected.
The rotation of the motor M1 stops.

Next, the motor M1 is rotated counterclockwise (hereinafter referred to as reverse rotation).
Let it. The reverse rotation of the motor M1 causes the planetary gear 28 of the hoisting system to revolve in a direction away from the transmission gear 32, while the planetary gear 106, which is the transmission system on the upper output shaft side, revolves to transmit the transmission gear 120 of the mirror drive / charge drive system. And the mirror drive gear 126 and the shutter charge gear 142 are rotated. This rotation causes both gears 126 and 142 to make one revolution,
134 is driven in the initial state of mirror down → mirror up → mirror down, and the shutter charge lever 146 is driven in the order of charge → charge release → charge, and the signal board 160 is driven.
From FIG. 8 (see FIG. 8), the empty charge is performed until the ground level signal is output from the detection pattern 162 as the next shutter merge completion phase.

By the empty charging operation by the reverse rotation of the motor M1,
The switching lever 170 is released from the holding of the initial position by the tensioning lever 174 and swings clockwise (transition from FIG. 7 (a) → FIG. 7 (b) → FIG. 7 (c)). As a result, the first regulating projection 170b of the switching lever 170 is connected to the planetary gear 106 and the rewind gear.
Away from 110 (see FIG. 9 (b)), while the second
The regulating protrusion 170c enters between the planetary gear 28 and the transmission gear 32 (see FIG. 10 (b)). Therefore, in the subsequent forward rotation of the motor M1, the meshing between the planetary gear 106 and the rewind gear 110 can be performed, and conversely, the meshing between the planetary gear 28 and the transmission gear 32 is prevented.

Next, the motor M1 is rotated forward. This means that the film F is rewound to a predetermined position, that is, an indexing position where the rewinding of each frame can be performed accurately thereafter. In this state, the number of the film frame number display 88c of the counter gear 88 indicates the number of frames that can be photographed.

Up to this point, the preliminary winding operation is completed, and the operation is maintained in this state unless a release operation is performed thereafter.

(Shooting operation) When the micro computer CPU determines that the release switch SW2 has been turned on by pushing the release button 2 (see FIG. 1), the motor M1 is rotated in the reverse direction. When the mirror drive gear 126 and the shutter charge gear 142 are rotated, the movable mirror 134 is mirrored up, and the shutter charge lever 146 is released from charge (see FIG. 7 (b)). Stop. In this state, the shutter operation is performed, and with the completion of the traveling of the rear blade group of the shutter, the motor M1 is further rotated in the reverse direction, and the mirror drive gear 126 and the shutter charge gear 142 are rotated again, and this time, the movable mirror is rotated. The mirror M is lowered, and the motor M1 is stopped when the shutter charge lever 146 is charged (see FIG. 7C). Immediately, the motor M1 is controlled to rotate forward,
The planetary gear 106, which is the transmission system on the output shaft side above M1, revolves and meshes with the rewind gear 110 to rewind the film. In the forward rotation of the motor M1, the planetary gear 28, which is the transmission system on the lower output shaft side, also revolves and tries to mesh with the transmission gear 32. In this state, the switching lever 170 is moved to the position shown in FIG. As shown in FIG.
Since 0c enters between the planetary gear 28 and the transmission gear 32 (see FIG. 10 (b)), the gears 28 and 32 do not engage with each other. The output of the motor M1 is not transmitted to the hoist transmission system.

When the film is rewound, the driven sprocket 80 rotates clockwise (in FIG. 2) following the movement of the film, and the detection gear 84 also rotates synchronously. Shortly before the film F is rewound by one frame, the motor M1 is driven by the duty control to decelerate. When the rewound of one frame is performed, the motor M1 is brake-controlled and stopped.

In this state, a standby state for photographing the next frame is established, the counter gear 88 is also rotated clockwise by one pitch, and the frame number display is reduced by one.

Thereafter, each time the release button SW2 is pressed, the above-described operation is repeated to perform photographing.

(Roll-in operation) At the time of the completion of the photographing operation, it is checked whether the current number of film frames is the second frame with an electric film counter,
If it is the second frame, the motor M1 is controlled to rotate forward and the film is wound around the cartridge. The electrical film counter referred to here is a counter (register E _COUNT ) built in the micro computer CPU, and counts up for each winding corresponding to one frame in the film preliminary winding operation, and one frame of film. It counts down when rewinding is completed. The electric film counter is exposed for the number of frames (three frames in this embodiment) corresponding to normal auto-loading at the initial stage of winding, that is, when the film is loaded from the film leader to several frames. It is used as information for prohibiting photographing in a concealed portion. When it is detected that the film F has been wound (or immediately before the winding) and the rotation of the driven sprocket 80 has stopped,
The motor M1 is stopped.

Then, the motor M1 is rotated in the reverse direction to perform an empty charge, and the motor M1 is stopped when the mirror drive gear 126 and the shutter charge gear 142 are rotated once (the mirror passes through the mirror up phase and the mirror is moved down). Let it.

The meaning of the empty charge after the film is wound is that the planetary gear 106 meshing with the rewind gear 110 is revolved in the direction of the transmission gear 120 by the above-mentioned film winding operation, and the planetary gear 28 is moved to the transmission gear 120 side. To revolve in the direction away from 32. That is, the positions of the two planetary gears 28 and 106 during the operation of the switching lever 170 that returns to the initial position and swings (counterclockwise) in conjunction with the opening of the back cover 70 (for film exchange) that occurs thereafter are specified. It is to ensure that the next film preliminary winding operation can be executed.

Due to the empty charge described above, especially the planetary gear 106
As it revolves to the 20 side, opening the back lid 70
As shown in FIG. 7D, the reset lever 178 is pivoted counterclockwise by the spring 180 so that the pushing projection 178b is moved by the switching lever 170.
(The spring 180 is set with a stronger spring force than the spring 172 for urging the switching lever 170 to swing clockwise). The counterclockwise swing of the switching lever 170 causes the tensioning lever 1
74 moves (pin 174c is guided by guide projection 170e)
To lock the latch pawl 174a to the tensioning projection 170d,
170 is returned to the initial position shown in FIG. 2 and FIG. 7 (a). Therefore, the first restricting projection 170b at the upper end of the switching lever 170 enters between the planetary gear 106 and the rewind gear 110 and inhibits the engagement of the motor M1 at the time of forward rotation. The second restricting projection 170c is separated from the space between the planet gear 28 and the transmission gear 32 to allow the motor M1 to mesh during normal rotation.

When the film F is replaced and the back cover 70 is closed again, the reset lever 178 is pushed by the pushing protrusion 70d and swings clockwise, and the pushing of the switching lever 170 is released.
However, as described above, the switching lever 170 can continue to be held since the tensioning lever 174 is locked to the tensioning projection 170d.

When the back cover 70 is opened, the reset lever 60 in the film winding system is released from the pushing by the pushing projection 70b, and is pushed by the reset spring 66 to swing clockwise.
Accordingly, as shown in FIG. 3 (c), the holding lever 62 also swings clockwise, and the pin 62a pushes the projecting portion 44b to swing the second planetary lever 44 clockwise.
46 is returned to the initial position where it can mesh with the transmission gear 54. After that, when the back cover 70 is closed again, FIG.
, And the position of the second planetary lever 44 does not change.

Further, when the back cover 70 is opened, the counter reset lever 90 in the film counter mechanism is released from being pushed by the pushing projection 70c, and swings counterclockwise by the spring 92. Accordingly, the pushing portion 90c of the counter reset lever 90 pushes the counter feed shaft 86 in the direction opposite to the counter gear 88, and sets the counter gear 8 to free so that the initial position (“E”) is increased by a spring force (not shown). The display is returned clockwise to the position visible in the display window 89), and the initial reset of the frame number display is performed. However, in the normal shooting operation, when the shooting of all the frames is completed and the film winding operation is completed, the counter gear 88 has already been intermittently returned to the initial position, so the return operation by the above-described spring is performed. Is performed when the back cover 70 is opened halfway during a simulated photographing operation without inserting the film into the camera by demonstration or the like.

In the film winding drive mechanism in the above-described embodiment, the first planetary lever 42 and the second planetary lever 44 are constituted by a common sun gear 38 independently of the transmission system on the spool 52 side and the transmission system on the drive sprocket 58 side. However, this is a measure to be taken when the back cover 70 is opened in a rewinding state in which the photographing of all the frames of the film has not been completed, and the film is rewinded by closing the back cover 70 again. That is, the opening of the back cover 70 releases the locking of the second planetary lever 44 and swings, so that the meshing between the second planetary gear 46 and the transmission gear 54 is allowed. Planetary gears 40, 46 associated with the driven rotation of the spool 52 and the drive sprocket 58 (reverse rotation from the winding).
Driven rotation occurs. Spool 52 and drive sprocket 58
However, when the planetary clutch mechanism is also provided in the transmission system on the spool 52 side as in this embodiment, the first planetary lever 42 swings. First
Since the meshing between the planetary gear 40 and the transmission gear 48 is appropriately disengaged,
I can deal with it.

[Characteristics in Examples]

At the time when the preliminary winding operation is completed and the process proceeds to the RELEASE routine shown in the flowchart of FIG.
The EFP flag as a determination flag for determining whether or not to execute the preliminary winding when the EF is closed is 0 (at step 24 in the flowchart of FIG. 12, EF
P flag remains reset). In this state, if the photographer accidentally closes the back cover 70 and closes the back cover 70 again, as is apparent from the flowchart of FIG. The routine proceeds to the routine, and the preliminary winding operation is not performed. Therefore, if the photographer rewinds the portion exposed by closing the back cover 70 by appropriately taking an aerial photograph, there is a possibility that the remaining film can be photographed.

Also, if the photographer opens the back cover 70 to replace it with another new film before all the frames have been shot, remove the backing film and close the back cover 70 without loading the film. To achieve.

As is clear from the flowchart of FIG. 12, when the back lid 70 is closed when the film is not loaded, the EFP flag is set to 1 (steps 3, 5, and 6). And this E
After setting the FP flag to 1, the process proceeds to the RELEASE routine in step 50. As apparent from the flowchart of FIG. 13, in the RELEASE routine, even if the film is not loaded, pressing the release button 2 performs operations required for demonstration such as shutter charge / release, shutter running, and the like.

If 1 is set in the EFP flag, a new film is next loaded and the back cover 70 is closed, and the process proceeds from step 7 to step 8 to perform a normal preliminary winding operation.

In the correspondence between the present invention and the embodiment, the memory corresponds to the non-volatile memory EEPROM in the microcomputer CPU, the load detection circuit corresponds to the film load detection switch SWPT _IN and the microcomputer CPU, and the back cover detection circuit corresponds to the back cover. The switch SWBP corresponds to the microcomputer CPU, and the control circuit corresponds to the microcomputer CPU.

〔The invention's effect〕

When the back cover is accidentally opened during the photographing and the back cover is closed again, the photographing can be continued as it is, so that there is no need to re-expose at least the frame that has been photographed and rewound in the patrone. Also, if you notice when you accidentally open the back cover and close the back cover instantly, the remaining film may be saved with only a few frames of exposure, but in the present invention in such a case Since preliminary winding was not performed, several frames of aerial photography could be used to help save frames.

If you want to replace the film with another new one before shooting all the frames, you can take a very simple operation of closing the back cover without loading the film, Provided is a motor driven camera in a pre-winding system in which a pre-winding operation of a film can be performed by closing.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the configuration and arrangement of a single-lens reflex camera as an embodiment. FIG. 2 is a perspective view of each component in FIG. FIG. 3 shows the spool-side main part of the film winding drive mechanism in the second position.
FIG. 3A is a view for explaining the operation as viewed from below, wherein FIG. 3A shows the state at the start of preliminary winding, and FIG. 3B shows the state after the leader of the film has been wound around the spool at the initial stage of preliminary winding. FIG. 3 (c) shows a state in which the back lid is opened. FIG. 4 is a view of the detection gear of FIG. 2 viewed from below. FIG. 5 is a view of the detection substrate of FIG. 2 as viewed from above. FIG. 6 is a time chart of signals obtained from each terminal of the detection board of FIG. 7A and 7B are explanatory diagrams of the operation of the film rewinding drive mechanism and the mirror box drive mechanism as viewed from the side. FIG. 7A shows the initial state or preliminary winding, and FIG. 7B shows the mirror up state. FIG. 7 (c) shows the mirror down state after the mirror box drive mechanism is operated. FIG. 8 is an explanatory view of the operation of the brush on the signal board. FIG. 8 (a) shows a state in which shutter charge is completed (mirror down), and FIG. 8 (b) shows a state in which mirror up is completed (shutter release). FIG. 9 is an explanatory view of the operation of the film rewinding drive mechanism as viewed from above. FIG. 9 (a) is an initial state or during preliminary winding, and FIG. 9 (b) is a mirror box drive mechanism by motor reverse rotation. In operation, FIG. 9 (c) shows the operation of the film rewind drive mechanism by forward rotation of the motor, and FIG. 9 (d) shows the back cover opened. FIG. 10 is an explanatory view of the operation of the main part of the film winding drive mechanism on the motor side as viewed from below. FIG. 10 (a) is an initial state or at the time of preliminary winding, and FIG. When the mirror box drive mechanism is operating, FIG. 10 (c) is when the film rewind drive mechanism is operating by forward rotation of the motor, and FIG. 10 (d).
Is when the back cover is opened. FIG. 11 is a main part circuit diagram relating to camera control. 12 and 13 are flow chart diagrams. CPU: microcomputer, EEPROM: nonvolatile memory, SWPT _IN: film loading detection switch, SWBP: back cover switch

Claims (2)

(57) [Claims] 1. A pre-winding motor-driven camera that rewinds the film for every frame in advance by closing the back lid when loading the film and rewinds the film for each photographing, and is capable of writing and reading electrically. Memory, a loading detection circuit for determining whether or not a film is loaded, a back lid detection circuit for detecting closure of the back lid, and a back lid when the loading detection circuit detects that no film is loaded. A control circuit for forcibly setting the setting of the memory to a state in which a preliminary winding operation is performed when the detection circuit detects that the back cover is closed. 2. A pre-winding motor-driven camera that rewinds the film for every frame in advance by closing the back lid when loading the film and rewinds the film for each photographing, and is capable of writing and reading electrically. Memory, a load detection circuit for determining whether or not a film is loaded, a back cover detection circuit for detecting the closing of the back cover, and when the preliminary winding operation is performed, the setting of the memory is changed to the preliminary winding operation. A first control circuit for setting to a prohibited state, and when the loading of the film is detected by the loading detection circuit, when the closing of the back lid is detected by the back lid detection circuit, A second control circuit for prohibiting the preliminary winding operation when the setting of the memory is set to the state where the preliminary winding operation is prohibited.