JPH0731349B2 - Focal length switch camera - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focal length switching camera, and more specifically, a rotational force of a motor is selectively applied to a film feeding system and a focal length switching system via a clutch mechanism. The present invention relates to a focal length switching camera for transmitting and feeding a film and switching a focal length of a photographing lens.

[Conventional technology]

Most of the recent 35mm compact cameras move the conversion lens in and out of the optical axis in conjunction with the movement of the master lens in the optical axis direction. For example, wide-angle shooting (wide shooting) with a focal length of about 35mm and focal length of about 70mm. The telephoto shooting (telephoto shooting) can be selected and performed.

Further, as described in JP-A-60-163010, JP-A-61-35435, etc., the rotational force of a film feeding motor is controlled by a focal length switching system via a clutch mechanism composed of a planetary gear train. In some cameras, the moving barrel holding the master lens is moved to switch the focal length. The clutch mechanism is, for example, a sun gear to which the rotational force of the motor is transmitted, an arm portion mounted coaxially with the sun gear, and a planetary gear rotatably mounted on the arm portion and always meshed with the sun gear. , The gear of the film feeding system that meshes with the planetary gear at the rotation end position by the arm that rotates in conjunction with this rotation when the sun gear rotates in one direction, and this rotation when rotating in the other direction of the sun gear. It is composed of a gear of a focal length switching system that meshes with a planetary gear at the other rotation end position by an arm that rotates in conjunction with each other, and the arm is rotationally displaced in the rotational direction by the rotational force of the sun gear. This rotational displacement causes the planetary gear to mesh with one of the film feeding gear and the focal length switching system gear, and the motor rotational force is transmitted to either the film feeding system or the focal length switching system. There.

[Problems to be solved by the invention]

However, in a camera that switches the focal length by also using a motor for film feeding, if a clutch mechanism consisting of only a planetary gear train is adopted, the meshing between the planetary gear and the gear of the focal length switching system may not work well. However, there are problems such as not being able to obtain reliable operation and causing a mechanism failure.

[Object of the Invention]

The present invention is to solve the above-mentioned problems, and when the focal length is switched by also using the film feeding motor, the meshing of the gears at the time of switching of the clutch mechanism is facilitated to ensure the An object of the present invention is to provide a focal length switching camera capable of various switching.

[Means for Solving the Problems] In order to achieve the above object, the present invention is arranged in a focal length switching system, and a switching cam rotated by a motor via a clutch mechanism and a switching cam provided in the switching cam. A pressing unit and a focal length switching lever that engages with the pressing unit and is displaced by the displacement of the pressing unit, and a focal length switching unit that selectively switches the focal length of the photographing lens by the focal length switching lever, The focal length is configured to shift between the focal length switching position and the film feeding position, is biased to the film feeding position, and changes from the film feeding position to the focal length switching position by the focal length switching operation. The switching set member and the focal length switching set member are provided on the planetary gear when the focal length switching set member is in the film feeding position. A drive switching engagement portion that sets the arm portion at a position where it is meshed with the system gear and allows rotation of the arm portion so that the planetary gear meshes with the focus switching system gear when the focal length switching setting member is at the focal length switching position. And a motor control means for reversing the motor by a focal length switching operation and stopping the motor after switching the focal length, and a gap for rotation play of a switching cam provided between the pushing portion and the focal length switching lever. It is equipped with.

[Action]

When switching the focal length, for example, when switching from wide-angle shooting to telephoto shooting, a focal length switching operation is performed. As a result, the focal length switching setting member is set from the film feeding position to the focal length switching position. Due to this displacement, the drive switching engagement portion releases the setting of the arm portion on the side of the film feeding system gear, and allows the arm portion to swing on the side of the focal length switching system gear. After that, the motor is rotated in the reverse direction by the motor control means, whereby the arm portion swings toward the focal length switching system gear side by the rotation of the sun gear.

A gap for rotational play of the switching cam is formed between the pushing portion of the switching cam and the focal length switching lever, and the switching cam is free to rotate within this gap range. Therefore, when the arm part oscillates toward the focal length switching system gear, when the planetary gear and the focal length switching system gear mesh with each other, even if these tooth tips are in contact with each other, the switching is performed. By letting the cam escape and rotate, these gears can be meshed smoothly and reliably. For this reason, the rotational force of the motor at the time of switching the focal length can be reliably transmitted to the focal length switching system, and the focal length can be switched reliably and smoothly. Moreover, immediately after the planetary gears and the focal length switching system gear mesh with each other, the switching cam is still in the free state due to the gap, so that even if the motor and the focal length switching lever are connected, the motor is suddenly loaded. Does not work, and the focal length can be switched smoothly.

Further, when the focal length switching is completed, the focal length switching setting member is set to the film feeding position, so that the drive switching engagement portion swings the arm portion, the planetary gear meshes with the film feeding system gear, and the motor By the normal rotation of, the film is advanced by one frame.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 13 showing a focal length switching camera embodying the present invention, a front plate 40 is provided with a tubular portion 41 projecting forward. The tubular portion 41 is provided with a lens cover opening / closing knob 42, and when the lens cover opening / closing knob 42 is slid, the pair of lens covers 43, 44 rotates to open / close the opening 45. In addition, the front plate 40 is provided with a tele / wide (hereinafter referred to as TW) switching knob 46. When this is pressed down, it is switched to wide shooting when set to the tele shooting state,
Alternatively, when the wide shooting is set, the shooting is switched to the tele shooting. As will be described later, even when the TW switching knob 46 is kept pressed down, it does not switch cyclically between tele shooting and wide shooting.

Further, a well-known finder window 48, distance measuring windows 49a and 49b, and a stroboscopic light emitting section 50 are provided above the front plate 40, and a release button 51 is provided above the front plate 40.

FIG. 1 shows an outline of the optical system. A lens holder 4 holding a master lens 3 is slidably fitted in the moving barrel 1 and is moved along the optical axis L in the moving barrel 1 by a known distance measuring device (not shown). You can move and adjust the focus. A plate 1a projects from one side of the movable barrel 1 and has a bearing portion.
1b is installed. This bearing 1b has an optical axis L
A guide rod 2 extending in the direction is inserted, and guides the movable barrel 1 when it moves between a telephoto shooting position where the master lens 3 is extended forward and a retracted wide shooting position. A coil spring 5 is inserted through the guide rod 2 and biases the movable barrel 1 toward the telephoto shooting position.

A conversion lens 6 is disposed behind the movable barrel 1, and the conversion lens 6 is moved in and out of the optical axis L of the master lens 3 by a lens loading / unloading mechanism 7 that is interlocked with the movement of the movable barrel 1. This lens access mechanism 7
Is the arm 7a with the conversion lens 6 attached to the tip.
A lens moving gear 7b to which the arm portion 7a is attached, and a gear 7d having a swinging arm portion 7c. A coil spring 7e is hooked on the arm portion 7a to urge the conversion lens 6 in the direction of inserting it into the optical axis L.

A behind shutter 8 is arranged behind the conversion lens 6. This behind shutter 8
As is well known, the shutter blades 8a and 8b are provided with two shutter blades 8a and 8b, and the opening and closing pin 8d is moved toward the fixed pin 8c that pivotally supports the shutter blades 8a and 8b. It can be rotated to open the shooting optical path. Also,
A diaphragm device 74 is attached to the rear portion of the movable barrel 1 as shown in FIGS.

A TW switching device 10 (see FIG. 4) is provided to move the master lens 3 and the conversion lens 6. In the TW switching device 10, as will be described in detail later, the first switching lever 12 swings to move the master lens 3 along the optical axis L, and the conversion lens 6 is inserted into the optical axis L. In order to move the master lens 3 and the conversion lens 6, as shown in FIG. 1, one end of the first switching lever 12 abuts on the cam surface of the second switching lever 13 and The pin 12d provided in the section is inserted into the long hole 1c of the plate 1a. The cam formed on the second switching lever 13 includes a non-displacement engaging portion 13a for holding the conversion lens 6 at the retracted position retracted from the optical axis L, and the conversion lens 6 is rotated to move to the optical axis L. It is composed of a displacement engaging portion 13b for inserting, and these are continuously formed. This second switching lever 13 is interlocked with the first switching lever 12 so that the shaft 13c
When it rotates about, the arm 7c is pushed via the slide lever 9 to rotate the gear 7d.

2 and 3 show a telephoto shooting state and a wide-angle shooting state. A fixed cylinder 55 is arranged in the cylindrical portion 41, and the movable cylinder 1 is slidably fitted therein.
Further, the lens covers 43 and 44 shown in FIG. 13 are rotatably arranged between the tube portion 41 and the fixed tube 55, and as shown in FIG. At times, the lens covers 43 and 44 can be opened and closed.

The behind shutters 8a and 8b are attached to a shutter substrate 56, and open and close a shutter opening 56a formed in the shutter substrate 56. This shutter substrate 56 is screw 5
It is fixed to the main body 58 through 7 and four holes 56b for mounting a fixed cylinder are provided. The four legs 55b formed on the fixed barrel 55 are inserted into these fixed barrel mounting holes 56b, and the fixed barrel 55 is fixed to the main body 58 via screws 59.

Behind the fixed cylinder 55, a holding plate 60 is fixed,
The guide rod 2 is supported between the holding plate 60 and the fixed cylinder 55. A mounting plate 61 is fixed to the inside of the fixed cylinder 55, and the lens loading / unloading mechanism 7 is mounted on the mounting plate 61.

Next, the TW switching device 10 will be described with reference to FIGS. 4 to 12. The TW switching knob 46 is linked to the TW subset slider 11 via a lever or the like (not shown), and when the TW switching knob 46 is operated, the TW subset slider 11 is slid to the left in the drawing.

The TW switching device 10 includes the first switching lever 12 described above.
And the second switching lever 13 and the first switching lever
Switching cam 14 for swinging 12 and this switching cam
A motor 15 that rotates 14 and a cam that switches this motor 15
A motor switch 16 that is activated to rotate 14, a motor switch lever 17 that engages with the switching cam 14 to perform a self-holding action of the motor switch 16, and a motor switch lever 17 when a switching operation force is applied. And a latch set lever 18 for turning the motor switch 16 to ON.

As described above, the motor 15 is also used for film feeding (winding and rewinding) in addition to TW switching, and is stored in the spool 15a for winding the film 65.
The rotational force of the motor 15 is transmitted to the transmission switching mechanism 20 as a clutch mechanism via the reduction gear train 19. The transmission switching mechanism 20 includes a sun gear 20a that is linked to the reduction gear train 19, an arm (arm) 20b that is coaxially attached to the sun gear 20a, and is rotatably attached to the arm 20b and always. Planetary gear 20c meshing with sun gear 20a
And the arm 20b as the sun gear 20a rotates counterclockwise in the figure.
Is composed of a film feed side gear 20d that meshes with the planetary gear 20c at the rotation end position when the is rotated, and a switching cam side gear 20e that also meshes with the planetary gear 20c at the other rotation end position. .

An engagement portion 20f that engages with the engagement portion 27b of the TW set slider 27 is formed on the arm 20b of the transmission switching mechanism 20. When the TW set slider 27 is in the initial position before the switching operation, the engaging portion 27b of the slider 27 is set in the arm 2
By pushing the engaging portion 20f of 0b, the arm 20b meshes the planetary gear 20c with the film feeding side gear 20d. On the other hand, at the time of TW switching, the TW set slider 27 is located in the left direction in the drawing, and is separated from the engagement portion 20f by the engagement portion 27b. Therefore, at the time of TW switching, the planetary gear 20c revolves clockwise and meshes with the switching cam side gear 20e by the clockwise rotation of the sun gear 20a, and otherwise the planetary gear 20c is forced to the film feeding side gear 20d. Are in mesh.

The rotation of the film feeding side gear 20d is caused by a gear 67 fixed to the take-up spool 15a via a gear train (not shown),
Rewinding gear via a one-way clutch (not shown)
Each is transmitted to 68. A rewinding claw 69 is fixed to the rewinding gear 68, and is connected to a cartridge shaft 71 of a cartridge 70 containing the film 65.

The switching cam 14 includes a gear portion 14a connected to the gear 20e on the switching cam side via an intermediate gear train 21, a circular cam portion 14b formed under the gear portion 14a, and a lower surface of the circular cam portion 14b. It is provided with an engagement pin 14c eccentrically planted, and is rotatably attached to a substrate (not shown) via a shaft. The circular cam portion 14b has two notches 1 with unequal length intervals in the circumferential direction.
4d is formed, and the peripheral surface between these two notches 14d is the first and second cam surfaces 14e, 14f (the 11th
(See Figures and 12). The notch 14d is for inserting the engagement protrusion 17a of the motor switch lever 17. Further, the engagement pin 14c pushes the swing restriction lever 23, the latch set lever 18, and the first switching lever 12 to swing these levers 23, 18, 12 as described later. .

The first switching lever 12 is provided with a locking claw portion 12a for restricting rotation (counterclockwise rotation in the drawing) of the movable barrel 1 toward the tele side and an engagement pin of the switching cam 14. It is provided with first and second engaging edge portions 12b and 12e engaging with 14c, and is rotatably attached to the substrate by an attaching shaft 12c.
Further, as shown in FIG. 1, the first switching lever 12 is biased by a coil spring 5 that biases the movable barrel 1 forward so as to always rotate to the tele side. A swing restricting lever 23 having a locking projection 23a that locks the locking claw portion 12a is rotatably mounted via a mounting shaft 23b. The swing restriction lever 23 has a function of restricting the rotation of the first switching lever 12 toward the tele side, and is biased clockwise by the coil spring 23c. The tip portion 23d of the swing restriction lever 23 is provided on the switching cam 1
It is positioned within the movement locus of the four engagement pins 14c, and is configured to be pushed by the engagement pins 14c immediately after the rotation of the switching cam 14 and rotated by a predetermined angle in the counterclockwise direction in the drawing.
Therefore, when the switching cam 14 rotates, the swinging restriction lever 23 rotates counterclockwise by the engagement pin 14c, and the locking projection 23
The locking between the a and the locking claw portion 12a is released. This makes the first
It is possible to rotate the switching lever 12 of (1) to the tele side.

The first engaging edge portion 12b has a shape of a quadrant of a circle which is a movement locus of the outer edge of the engaging pin 14c, and when the switching lever 12 is switched to the tele side (counterclockwise rotation). ) Contacts the engaging pin 14c. Therefore, the switching cam 14
When the engagement pin 14c comes into contact with the engagement edge portion 12b by the rotation of, the first switching lever 12 is kept at the position until the first 1/4 rotation of the switching cam 14 is completed, and the 1/4 rotation is performed. When it passes, the first switching lever 1 moves with the movement of the engaging pin 14c.
2 will also be rotated to the tele side. Further, the second engagement edge portion 12e is formed so as to be continuous with the first engagement edge portion 12b and slightly protrude from the first engagement edge portion 12b, so that the second engagement edge portion 12e is widened to the wide side of the switching lever 12. Is engaged with the engaging pin 14c at the time of switching (clockwise rotation).

As shown in FIG. 5, when the switching cam 14 is in the initial state of the wide side position, between the engagement pin 14c and the tip end portion 23d of the swing restriction lever 23, and the engagement pin 14c. First
Between the engaging edge portion 12b of the switching lever 12 of
Gaps 75, 76 for the rotational play of the switching cam 14 are formed as means for forming the free state of the switching cam 14 when switching to the tele side. Therefore, the rotation of the switching cam 14 is made free within the range of these clearances 75, 76 and within the play range of the notch 14d and the engagement projection 17a described later, as will be described later in detail. Planetary gear 20c of transmission switching mechanism 20
The meshing with the gear 20e on the switching cam side is smoothly and reliably performed. Further, as shown in FIG. 12, when the switching cam 14 is in the initial state of the tele side position, the engaging pin 14c and the second engaging edge portion 12e of the first switching lever 12 are arranged.
A clearance 77 for the rotational play of the switching cam 14 is formed between and as a free state forming means of the switching cam 14 at the time of switching to the wide side. Therefore, like the free state forming means, the planetary gear 20c of the transmission switching mechanism 20 and the switching cam-side gear 20e are meshed smoothly and reliably when switching from the tele side to the wide side.

As shown in FIGS. 11 and 12, the non-displacement engaging portion 13a of the second switching lever 13 is an arc that is a movement locus of the engaging portion 12f at the tip when the first switching lever 12 rotates. It is formed in a shape, and its length is approximately 3/4 of the moving stroke of the lever 12 when the moving barrel 1 moves from the telephoto side position to the wide side position. The displacement engagement portion 13b is located inside the extension line of the non-displacement engagement portion 13a, and is a substantially triangular recess into which the tip engagement portion 12f of the first switching lever 12 is inserted. Therefore, when the first switching lever 12 moves to about 3/4 of its moving stroke, the tip end engaging portion 12f and the non-displacement engaging portion 13a come into contact with each other.
Only the first switching lever 12 rotates, and the second switching lever 13 does not rotate. First switching lever
When 12 rotates more than 3/4 of its travel, tip engaging part 12f
Comes into contact with the displacement engaging portion 13b from the non-displacement engaging portion 13a, and the second switching lever 13 biased in the clockwise direction in the figure by the coil spring 7e causes rotational displacement of the first switching lever 12. Correspondingly, it will rotate clockwise. Therefore, when the movable barrel 1 is moved by 3/4 or more of its movement stroke,
In conjunction with this, the conversion lens 6 is inserted into the optical axis L.

The motor switch lever 17 has a cutout for the switching cam 14.
An engaging projection 17a that is inserted into 14d and blocks the rotation of the switching cam 14 during this insertion, and this engaging projection 17a is a notch 14d.
And a switch changeover piece 17b for turning off the motor switch 16 when positioned inside. In this motor switch lever 17, the engaging projection 17a is located in the cutout 14d to prevent the cam 14 from rotating and the motor switch 16 is turned off. When it comes out, the lock with the switching cam 14 is released and the motor switch
It is attached to the substrate via a shaft 17c so as to be rotatable between an unlocking position where 16 is turned on. Since the first cam surface 14e and the second cam surface 14f of the switching cam 14 have unequal lengths, the rotation angle of each time the switching cam 14 depends on the length of these cam surfaces 14e, 14f. It will change periodically.

As shown in FIG. 5, the latch set lever 18 engages with the engaging pin 14c to push the motor switch lever 17 to the locking position side, and when the switching operation force is applied, the motor switch lever 17 Is rotated from the locked position to the unlocked position. Therefore, the latch set lever
Reference numeral 18 denotes a latch engaging portion 18a with which a latch lever 25 for switching the motor switch lever 17 to the locking position or the unlocking position is engaged, the latch engaging portion 18a and the latch lever.
After the latch (latch) by 25 is released, the engaging pin 14
It is provided with first and second engagement pushing surfaces 18b, 18c for rotating the latch set lever 18 in the clockwise direction by pushing of c to again latch the latch engaging portion 18a and the latch lever 25. . The first engagement pushing surface 18b is a surface for contacting the engagement pin 14c when switching from the wide side to the tele side. The second engagement pushing surface 18c is a surface for contacting the engagement pin 14c when the tele side is switched to the wide side.

The latch set lever 18 is a motor switch lever 17
Is rotatably mounted on the substrate by a mounting shaft 17c of a motor switch lever 17 and is urged counterclockwise in the drawing by a coil spring (not shown). Further, a torsion spring 24 that urges the motor switch lever 17 toward the locking position is interposed between the motor switch lever 17 and the latch set lever 18. Further, the latch lever 25 is biased counterclockwise in the figure by the coil spring 25a.

The transmission of the switching operation force from the TW switching knob 46 to the motor switch lever 17 is performed by the leftward movement of the TW subset slider 11, the transmission lever 26, the TW set slider 27 to which the transmission lever 26 is attached, and the latch lever. 25, by being sequentially transmitted to the latch set lever 18.

The transmission lever 26 is the engagement protrusion 11 of the TW subset slider 11.
It has a claw 26a that engages with a and is rotatably attached to the TW set slider 27 via a mounting shaft 26b. The transmission lever 26 is biased clockwise by a coil spring 26c in the figure. Further, when the transmission lever 26 is engaged with the engagement protrusion 11a which is the engagement portion of the TW subset slider 11 and is moved to the vicinity of the end of its movement, it hits the transmission lever 26 and engages the lever 26 with its claw 26a. A lock release pin 30 that swings so as to release the lock with the mating protrusion 11a is attached to the substrate.

The TW set slider 27 is mounted on the substrate so as to be slidable in the same direction as the sliding direction of the TW subset slider 11 by the mounting shaft and the elongated hole through which this shaft penetrates. The TW set slider 27 and the TW subset slider 11 are biased rightward in the figure by coil springs 28 and 29.

Next, the operation of this embodiment will be described.

When taking a picture, first, the lens cover opening / closing knob 42 is slid to open the lens covers 43 and 44. This lens cover 43,
Main switch (not shown) when 44 is moved to open position
Is turned on, and the drive circuit of the motor 15, the shutter drive circuit, the distance measuring device, the strobe circuit, etc. are energized.

When the lens covers 43 and 44 are open, the wide shooting state is set as shown in FIG. 3, and the movable barrel 1 is set back to the position where the movable barrel 1 moves backward and enters the moving range of the arm portion 7a. In this wide-angle shooting state, when the release button 51 is pressed, the distance measuring device is activated to move the lens holder 4 along the optical axis L according to the subject distance, and adjust the focus of the master lens 3. After this focus adjustment, the behind shutter 8 is activated to expose the film 65. After this shutter operation, the motor 15 rotates, and its rotational force is transmitted to the transmission switching mechanism 20 via the reduction gear train 19. In this transmission switching mechanism 20, the planetary gear 20c is a film feeding side gear 2
Since it meshes with 0d, the rotation of the motor 15 is transmitted to the film feeding side gear 20d. Since the rotation of the film feeding side gear 20d is transmitted to the gear 67 through the gear train, the take-up spool 15a rotates to wind the exposed film 65 around the outer circumference thereof and draw it from the cartridge 70. Set the exposure film to the exposure position. Further, the behind shutter 8 is charged in association with the film winding.

Next, when switching from the wide shooting state shown in FIG. 3 to the tele shooting state shown in FIG. 2, the TW switching knob 46 may be slid. When the TW switching knob 46 is slid, the TW subset slider 11 moves leftward in the figure in conjunction with this, and the state shown in FIG. 5 changes to the state shown in FIG. As a result, the TW set slider 27 also moves to the left in the figure via the transmission lever 26 that is locked to the engaging protrusion 11a of the TW subset slider 11. By this movement, the engagement protrusion 27c of the TW set slider 27 faces the notch 17d of the motor switch lever 17, so that the motor switch lever 17 is allowed to rotate counterclockwise.

Further, the latch projection 25a of the TW set slider 27 rotates the latch lever 25 in the clockwise direction, and the latched state between the latch lever 25 and the latch set lever 18 is released. As a result, the latch set lever 18 rotates counterclockwise in the figure, and the motor switch lever 17 also rotates counterclockwise via the torsion spring 24 hung between the latch set lever 18 and the engaging protrusion.
17a comes out of notch 14d. The rotation of the motor switch lever 17 turns on the motor switch 16, and the motor 15 is energized to rotate. By the rotation of the motor 15, the planetary gear 20c revolves around the sun gear 20a and meshes with the switching cam side gear 20e. As a result, the rotational force of the motor 15 is transmitted to the switching cam 14 via the switching cam side gear 20e and the intermediate gear train 21, and the switching cam 14 rotates clockwise. At this time, as the free state forming means of the switching cam 14, between the engagement pin 14c of the switching cam 14 and the tip end portion 23d of the swing restriction lever 23, and between the engagement pin 14c and the first switching lever 12. Since the clearances 75 and 76 for the rotational play of the switching cam 14 are formed between the edge portion 12b and the edge portion 12b, respectively, the notch 14d of the switching cam 14 and the engaging projection 1 of the motor switch lever 17 are formed.
Switching cam within the play formed between 7a and
14 will be free. Therefore, when the planetary gear 20c of the transmission switching mechanism 20 meshes with the switching cam side gear 20e, the switching cam 14c is engaged even if the tooth tips are in contact with each other.
By escaping and rotating, the planetary gear 20c can be smoothly and reliably meshed with the switching cam-side gear 20e.

Note that FIG. 6 shows a state immediately after the TW subset slider 11 has moved to the end of movement. By the movement of the slider 11 to the end of the movement, the transmission lever 26 comes into contact with the locking release pin 30 projectingly formed from the substrate and rotates counterclockwise, thereby locking the engaging projection 11a and the claw 26a. Is released,
The TW set slider 27 moves to the right in the figure and tries to return. However, since the engaging protrusion 27c of the TW set slider 27 comes to be locked in the notch 17d of the motor switch lever 17 rotated to the unlocking side, the TW set slider 27
Will never return completely. Therefore, in this state, since the engaging portion 27b does not contact the engaging portion 20f, the planet gear 20c is kept in mesh with the switching cam side gear 20e. Although the TW set slider 27 does not completely return, the transmission lever 26 and the TW subset slider 11
Since the engagement with the engaging projection 11a is released and the connection between the TW subset slider 11 and the TW set slider 27 is broken, even if the TW switching knob 46 is positioned on the switching side, It is possible to prevent the switching from being switched periodically.

When the switching cam 14 starts to rotate in the clockwise direction, as shown in FIG. 7, the swinging restriction lever 23 first rotates in the counterclockwise direction by the engagement pin 14c thereof. This makes the first
Since the locking claw portion 12a of the switching lever 12 and the locking projection 23a of the rocking regulation lever 23 are released, the first switching lever 12 rotates counterclockwise about the shaft 12c. The engaging edge portion 12b comes into contact with and follows the engaging pin 14c. However, since the engaging edge portion 12b has a quadrant arc shape, the first switching lever 12 is not rotated to the tele side until the switching cam 14 has completed 1/4 rotation.

Since the engagement pin 14c of the switching cam 14 and the first engagement push surface 18b of the latch set lever 18 come into contact with each other during this 1/4 rotation,
The latch set lever 18 is rotated clockwise in the figure, and is returned to the initial position by the latch lever 25 being locked. When the latch set lever 18 returns to the initial position, the spring 24 is charged, so that the motor switch lever 17 is biased clockwise in the figure. However, the circular cam part 14b
Since the tip of the engaging protrusion 17a is in contact with the peripheral surface of the motor switch lever 17, the motor switch lever 17 cannot rotate clockwise in the figure, and the motor switch 16 is maintained in the ON state. As a result, the motor switch 16 is self-held when switching from wide shooting to tele shooting.

As shown in FIG. 8, the first switching lever 12 has almost the same force as the switching cam 14 due to the elastic restoring force of the coil spring 5.
It rotates counterclockwise following the movement of the engagement pin 14c due to the rotational displacement of 1/4 or more. As a result, the movable barrel 1 is extended forward, and the master lens 3 is set at the telephoto shooting position. The positioning of the movable barrel 1 on the wide side is performed by the second
As shown in the figure, for example, the front surface of the moving barrel 1 is a fixed barrel 55.
It is done by hitting. Therefore, after the movable barrel 1 is extended forward and hits the fixed barrel 55, the forward movement of the movable barrel 1 is restricted, and thus the rotation of the first switching lever 12 is also restricted at this position.

The tip portion 12f of the first switching lever 12 has a coil spring 7
Since the second switching lever 13 is in contact with the cam surface of the second switching lever 13 biased by e, the second switching lever 13 is interlocked with the first switching lever 12. However, this second switching lever
13, the first switching lever 12 is approximately
Since the non-displacement engaging portion 13a contacts the one end portion 12f of the first switching lever 12 during the rotation of 3/4, even if the first switching lever 12 rotates, it does not follow this.
Then, as shown in FIG. 12, when rotating the remaining 1/4, one end 12f of the first switching lever 12 faces the displacement engaging portion 13b of the second switching lever 13, This second
The switching lever 13 rotates rapidly around the shaft 13c as a fulcrum. When the second switching lever 13 rapidly rotates, the lens moving mechanism 7 follows this via the slide lever 9, so that the swing arm portion 7a rotates counterclockwise and the conversion lens 6 is illuminated. Insert on axis L. Therefore, when the master lens 3 moves to a position sufficiently distant from the conversion lens 6, the conversion lens 6 rapidly rotates, so that these lenses do not collide.

As shown in FIG. 9, when the switching cam 14 rotates about 1/2 or more, the engaging protrusion 17a of the motor switch lever 17 is inserted into the notch 14d, so that the motor switch lever 17 is moved to the initial position. Then, the motor switch 16 is turned off to stop the motor 15. Also, the motor switch lever
By the return of the initial position of 17, the engagement state between the engagement protrusion 27c of the TW set slider 27 and the notch 17d of the motor switch lever 17 is released, and the TW set slider 27 also moves to the right in the drawing to move to the fifth position. Return to the initial position as shown. With this return to the initial position, the engaging portion 20f of the arm 20b of the transmission switching mechanism 20 is pushed by the engaging portion 27b of the TW set slider 27, and the arm 20b is rotated counterclockwise. This arm 2
When 0b is rotated, the planet gear 20c is moved to the film feeding side gear 20d.
It will be forced to mesh with the side.

As a result of the above operation, the movable barrel 1 is extended forward through the fixed barrel 55 from the wide shooting state in which the movable barrel 1 is housed in the fixed barrel 55, as shown in FIG.
The telephoto photographing state in which the conversion lens 6 is inserted on the optical axis L at the rear of is switched to. The switching from the wide shooting state to the tele shooting state is performed using the first cam surface 14e of the switching cam 14. Since the first cam surface 14e is formed longer than the second cam surface 14f, the rotation angle and the rotation time of the switching cam 14 become longer than that of the second cam surface 14f, and this increase The swing control lever 23 and the latch set lever 18 are swung according to the rotation time and the rotation angle. Moreover, since these swings are sequentially performed, the load on the motor that rotates the switching cam 14 can be lightened without concentration of these swings.

Next, it is possible to switch from tele shooting to wide shooting by the same operation as the above-described switching from wide shooting to tele shooting. That is, when the TW switching knob 46 is slid, as shown in FIG. 10, the motor switch lever 17 is pulled out from the cutout 14d of the switching cam 14, and at the same time, the motor switch 16 is turned on. At this time, as shown in FIG. 9, between the engagement pin 14c of the switching cam 14 and the second engagement edge portion 12e of the switching lever 12, as a free state forming means at the time of switching to the wide side. Since the clearance 77 for rotation play of the switching cam 14 is formed, the switching cam 14
The switching cam 14 becomes free within the play formed between the notch 14d and the engaging protrusion 17a of the motor switch lever 17. Therefore, when the planetary gear 20c of the transmission switching mechanism 20 meshes with the gear 20e on the switching cam side, the planetary gear 20c is rotated by allowing the switching cam 14 to escape even if the tooth tips are in contact with each other. Can be smoothly and surely engaged with the switching cam side gear 20e.

At the initial stage of the rotation of the switching cam 14, the second pushing surface 18c of the latch set lever 18 is pushed through the engagement pin 14c to return the latch set lever 18 to the initial position, and at the same time, the latch set lever 18 is pushed. It is locked by the latch lever 25. Then, when the switching cam 14 further rotates, the engaging pin 14c hits the engaging edge portion 12e of the first switching lever 12, so that the elastic restoring force of the coil spring 5 for urging the movable barrel 1 to the front side is resisted. The engagement pin 14c pushes the first switching lever 12 to rotate it in the clockwise direction and start the retreat of the movable barrel 1. At the same time, the tip of the first switching lever 12 pushes the engaging arm portion 13a of the second switching lever 13 as the first switching lever 12 rotates toward the wide-angle shooting side. The switching lever 13 rotates counterclockwise in conjunction with the rotation of the first switching lever 12 to retract the conversion lens 6 from the optical axis via the slide lever 9 and the lens loading / unloading mechanism 7 (see FIG. 1).

When the switching cam 14 continues to rotate, its engaging pin 14
By c, the first switching lever 12 is further rotated clockwise. When the first switching lever 12 is pushed to the maximum in the clockwise direction, as shown in FIG.
a rides over the locking projection 23a of the rocking restriction lever 23, and the locking claw portion 12a and the locking projection 23a are locked. This allows
The first switching lever 12 is locked at the wide shooting position by the swing restriction lever 23 so that it cannot rotate counterclockwise. Even after this locking, since the switching cam 14 slightly rotates, the engagement pin 14c moves to a position separated from the second engagement edge portion 12e, and the state shown in FIG. 5 is restored.

When the switching cam 14 and the first switching lever 12 return to the state shown in FIG. 5, the motor switch lever 17 enters the notch 14d of the control cam 14, so that the motor switch 16 is turned off and the TW set slider 20 is also moved. Return to the initial state. this
The TW set slider 20 disengages the planetary gear 20c from the switching cam side gear 20e and forcibly meshes with the film feeding side gear 20d. The switching from the telephoto shooting state to the wide-angle shooting state described above is performed by the second cam surface 14 of the switching cam 14.
done using f. Also, the engaging pin 14c of the switching cam 14
And the switching lever 12 are switching levers when the master lens 3 is switched from the telephoto shooting position to the wide shooting position.
Since the twelve mounting shafts 12c are contacted with each other on the far side, the first switching lever 12 can be swung with a large torque. Therefore, it becomes possible to easily swing the first switching lever 12 against the elastic restoring force of the coil spring 5 that biases the movable barrel 1 forward.

When the photographing of all frames of the film 65 is completed, the reverse rotation of the motor 15 is automatically started as is well known, and the rewinding claw 69 is rotated via the transmission switching mechanism 20 (see FIG. 4). When the rewinding claw 69 rotates, the exposed film 65 wound on the spool 15a is rewound into the cartridge 70.

In the above embodiment, the conversion lens 6 is inserted into the optical axis of the master lens 3 by switching the second switching lever 13 by interlocking with the first switching lever 12, but the present invention is not limited to this. However, the conversion lens 6 can be inserted into the optical axis L by using another mechanism.

Further, in the above embodiment, the photographing lens is configured by the master lens 3 that moves in the optical axis direction when the focal length is switched and the conversion lens 6 that is inserted in the optical axis of the master lens 3 during telephoto photographing. The invention can also use a zoom lens.

〔The invention's effect〕

As described above, according to the present invention, the film feeding and the focal length switching can be performed by the single motor through the clutch mechanism. Moreover, since the drive distance engaging portion is provided in the focal length switching setting member, the planetary gear can be reliably meshed with the film feeding side gear when the focal length switching setting member is set at the film feeding position. Therefore, reliable film feeding can be performed.

Further, when the focal length switching setting member is set to the focal length switching position by the focal length switching operation, the drive switching engaging portion makes it possible to swing the arm portion of the planetary gear to the focal length switching gear side and the switching cam. Since a gap for the rotational play of the switching cam is provided between the pushing part of the and the focal length switching lever, when the sun gear is rotated in reverse and the rotational force of the motor is transmitted to the focal length switching system, the focal length switching side gear When the gear and the planetary gear mesh with each other, the switching cam escapes and rotates even if these tooth tips are in contact with each other. Can be engaged. Therefore, 1
When not only film feeding but also focal length switching is performed by using one motor, the rotational force of the motor at the time of focal length switching can be reliably transmitted to the switching cam of the focal length switching system. Therefore, the focal length switching operation can be performed reliably and smoothly.

Moreover, immediately after the planetary gear and the focal length switching gear mesh with each other, the switching means is still in the free state due to the clearance for the rotational play, so that even if the motor and the switching cam are connected, the motor suddenly moves. This makes it possible to smoothly switch the focal length without any load.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a focal length switching camera of the present invention. FIG. 2 is a sectional view of an essential part of the focal length switching camera set in the telephoto shooting state. FIG. 3 is a sectional view of an essential part of the focal length switching camera set to the wide-angle shooting state. FIG. 4 is a perspective view showing the TW switching device. FIG. 5 is a plan view of the TW switching device shown in FIG. 6 to 10 are plan views for sequentially explaining the operation of the TW switching device. FIG. 11 shows the first and second images set in the wide-angle shooting state.
It is a top view which shows the relationship of a switching lever. FIG. 12 is a plan view showing the first and second switching levers set in the telephoto shooting state. FIG. 13 is an external view of a focal length switching camera of the present invention. 1 ... moving barrel 3 ... master lens 6 ... conversion lens 8 ... behind shutter 10 ... TW switching device 11 ... TW subset slider 12 ... first switching lever 13 ... second switching lever 14 ... … Switching cam 15 …… Motor 16 …… Motor switch 17 …… Motor switch lever 18 …… Latch set lever 20 …… Transmission switching mechanism 23 …… Swing restriction lever 25 …… Latch lever 26 …… Transmission lever 27 …… TW set slider 30 …… Lock release pin 46 …… TW switching knob 70,71,72 …… Gap.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tokuya Mochizuki 369 Nagata Mansion, 369 Shimizu, Showa-cho, Nakakoma-gun, Yamanashi Prefecture (72) Inventor Hiroshi Komatsuzaki 2-26-30, Nishiazabu, Minato-ku, Tokyo Fuji Photo Film Co., Ltd. (56) Reference JP-A-62-144149 (JP, A) Actually developed Shou 60-88327 (JP, U)

Claims (1)

[Claims] 1. A planetary gear that meshes with a sun gear is attached to an arm, and the sun gear is normally or reversely rotated by a motor so that the planetary gear meshes with a gear of a film feeding system by the normal rotation of the sun gear. To rotate the motor to the film feeding system, and by rotating the sun gear in reverse, swing the arms so that the planet gears mesh with the gears of the focal length switching system and rotate the motor to the focal length. In a focal length switching camera in which a single motor is used to feed a film and switch a focal length of a photographing lens via a clutch mechanism that transmits to the switching system, the focal length switching system is arranged in the focal length switching system, A switching cam rotated by a motor via the clutch mechanism, a pushing portion provided on the switching cam, and a focal length switching lever that engages with the pushing portion and shifts by a shift of the pushing portion, Focal length switching means for selectively switching the focal length of the taking lens by means of the focal length switching lever, and for moving between the focal length switching position and the film feeding position, the film feeding position is biased. And a focal length switching setting member that shifts from the film feeding position to the focal length switching position by the focal length switching operation, and when the focal length switching setting member is at the film feeding position. The arm is set at a position where the planetary gear meshes with the gear of the film feeding system, and when the focal length switching setting member is at the focal length switching position, the planetary gear rotates to mesh with the gear of the focus switching system. And the drive switching engagement section that allows the And motor control means for stopping, focal length switching camera, characterized in that a clearance for rotational play of the switching cam provided between the pressing portion and the focal length switchover lever.