JPH073536B2 - Optical system switchable camera - Google Patents

Description

[Technical Field of the Invention] The present invention includes a main optical system and a sub-optical system. For example, when the main optical system alone is used for wide-angle photography and the sub-optical system of the main optical system is combined. Relates to an optical system switchable camera capable of performing telephoto shooting.

[Background of the Invention] In an optical system switchable camera, when the optical system is switched, it is necessary to switch the finder optical system accordingly in order to avoid occurrence of a shooting error.

The viewfinder optical system is generally installed in an extremely narrow space of a part of the camera. However, if the finder optical system is automatically switched when the camera optical system is switched, interference is likely to occur when the members are moved. Therefore, there is a problem in that the means for switching the finder optical system becomes large in size, which causes an increase in the weight and size of the camera, or becomes uncool.

"Object of the Invention" An object of the present invention is to provide an optical system switching type camera which solves the above problems by enabling switching of the finder optical system even in a narrow space.

[Structure of the Invention] In order to achieve the above object, in the present invention, a first optical system capable of switching an optical action, a finder optical path insertion position, and a retractable position from the optical path are provided. A finder optical system, a second finder optical system that can be displaced from a position inside the displacement locus of the first finder optical system to a position outside the displacement locus, and the first finder optical system in conjunction with the switching operation of the photographing optical system. First finder optical system driving means for displacing between the insertion position and the retracted position, and the second finder optical system while the first finder optical system is displaced in association with the switching operation of the photographing optical system. Second finder optics for displacing the first optical system so as to temporarily retract from the position inside the displacement locus to the position outside the locus by rotationally moving about one rotation on the optical axis formed by the second optical system as a fulcrum. An optical system switching type camera including a driving means is provided, and when the first finder optical system is displaced, the second finder optical system, which is normally within the displacement trajectory of the first finder optical system, is temporarily out of the displacement trajectory. The first finder optical system is moved and switched over by the minimum path by retracting the first finder optical system.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1 and FIG. 2, a focal length selection member 2 is provided on the rear surface of the camera body 1, and inside the camera body 1, a switch SW1 and a focal length selection switch SW1 interlocked with a dust cover (not shown) are provided. Switch SW2 interlocking with member 2
And are provided.

On the front side of the camera body 1, a main optical system 3 is provided so as to be displaceable in the optical axis direction (left and right direction in the drawing), that is, retractable and retractable. Inside the camera body 1, the sub-optical system 4 crosses the optical axis of the main optical system 3 between the position inserted into the light beam of the main optical system 3, that is, the photographing light beam and the position retracted from the light beam (first It is provided so that it can be displaced in the vertical direction in FIG.

A plurality of finder optical systems including a first finder optical system 5 and a second finder optical system 6 are provided above the camera body 1 by being housed in the finder housing portion 1a.

The switch SW1 is set to be turned off when the dustproof cover covers the main optical system 3 and turned on when the front surface of the main optical system 3 is opened. The switch SW2 is turned on when the focal length selection member 2 is in the telephoto position.
And is set to OFF when in the wide-angle position.

FIG. 3 is a perspective view showing the main optical system displacement mechanism and the finder system switching mechanism of this embodiment.

This figure shows a state in which the main optical system 3 is at the extended position. An opening 10a through which a photographing light flux passes is formed in the central portion of the base plate 10.
Is provided, and the diaphragm / shutter device 11 and the main optical system 3 indicated by a chain line are fixed in front of it.
A motor 12 is fixedly installed on the upper back surface of the base plate 10. Both ends of the rotary shaft penetrate through both end faces of the casing of the motor 12 and project therefrom. A bevel gear 12a (illustrated in FIG. 4) is fixedly mounted on one end of the rotary shaft. A bevel gear 13 axially supported by the base plate 10 is engaged with the bevel gear 12a, and a spur tooth portion of the gear 13 is engaged with a gear 14 also axially supported by the base plate. A through hole is formed in the center of the gear 14, and a female screw whose center is the rotation center of the gear 14 is cut in the through hole. A male screw cut on the guide shaft 15 is screwed onto the female screw. The guide shaft 15 extends in the optical axis direction, the end is fixed to the substrate 1c of the camera body 1, and the tip is inserted into the through hole 10b of the base plate 10 so as to be slidable in the axial direction. A bevel gear 12b is fixed to the other end of the rotation shaft of the motor 12. This bevel gear 12b has a base plate 10
The bevel gear 16 pivotally supported on the gear meshes with the spur teeth of the gear 16.
a is engaged. A through hole is formed in the center of the output gear 17b of the gear train 17, and a female screw whose axis is the rotation center of the gear 17b is cut in the through hole. A male screw cut on the guide shaft 18 is screwed into the female screw. The guide shaft 18 extends in the optical axis direction, the end is fixed to the substrate 1c of the camera body, and the tip is inserted into the through hole 10c of the base plate 10 so as to be slidable in the axial direction. The amount and direction of rotation of the gears 14 and 17b with respect to a certain amount of rotation of the motor are set to be equal, and the conditions for screwing the gear 14 and the guide shaft 15 and screwing the guide shaft 18b of the gear 17b are also set. Are set equal. Board 1
A guide shaft 19 extending in the optical axis direction is also planted in c. The guide shaft 19 is axially slidably inserted into the through hole 10e of the overhanging portion 10d and the through hole 10f of the base plate 10, which are provided on the back surface of the base plate 10.

With this structure, when the motor 12 rotates, the gear 14
By the screwing of the guide shaft 15 and the screwing of the gear 17b and the guide shaft 18, the base plate 10 is moved in parallel in the optical axis direction while keeping the vertical direction with respect to the optical axis, and the main optical system fixed to it. 3. The diaphragm / shutter device 11 is displaced in the optical axis direction between the feeding position and the feeding position.

A printed circuit board 20 is fixed to the right side surface of the base plate 10.
Conductor lands 20a to 20c are provided on the surface of this printed circuit board 20, and these are fixed to the camera body.
The two sliding contact pieces 21 to 23 are each slidable.
The sliding contact piece 21 and the conductor land 20a form a switch SW3, the sliding contact piece 22 and the conductor land 20b form a switch SW4, and the sliding contact piece 23 and the conductor land 20c form a switch SW5. The switch SW3 is OFF when the main optical system 3 is in the feeding device, the switch SW4 is in the feeding position, and the switch SW5 is OFF when it is between the feeding position and the feeding position. Switches SW3 and SW5 work as limit switches, and the main optical system 3
When the motor is displaced to the feeding position or the feeding position, the motor 12
Cut off the power supply. The switch SW5 is a switch for disabling shutter release when the main optical system 3 is located at an intermediate position between the above two positions and a subject image cannot be formed on the film surface. Circuit 31
It is a switch for cutting off the power supply to (illustrated in FIG. 8).

The film 24 is arranged behind the photographing opening 1d opened in the substrate 1c.

FIG. 4 is a perspective view of the mounting / demounting mechanism of the sub optical system arranged on the back surface of the base plate 10.

In the figure, a reduction gear train 25, a cam gear 26, and a drive member 27 are axially supported on the back surface of the base plate 10, and the drive member 27 holds the sub optical system 4. Input gear of reduction gear train 25
25a meshes with the spur gear portion of the bevel gear 13, and the final gear 25b of the reduction gear train 25 meshes with the cam gear 26. The cam gear 26 and the drive member 27 are coaxial,
The two are coupled via a front cam 26a provided on the end surface of the cam gear 26.

The 25 reduction ratios of the reduction gear train are set as follows. That is, when the main engineering system 3 is at the extended position, it is placed at the insertion position (shown by the solid line) where the sub optical system 4 is inserted in the photographing light beam, and when the main optical system 3 is at the retracted position, the sub optical system 3 is placed. 4 is placed at a retracted position (illustrated by a chain double-dashed line) retracted from the photographing light flux.

FIG. 5 shows a sectional view of the auxiliary optical system mounting / demounting mechanism.

In each drawing, the main optical system 3 and the diaphragm / shutter device 11 are fixedly mounted on the base plate 10 in front of the opening 10a, and the positioning means 28 for the sub-optical system 4 is formed behind the opening 10a. . The positioning means 28 is composed of an inner cylindrical surface 28a having the optical axis of the main optical system 3 as its axis, a guide surface 28b in the shape of a platter, and a contact surface 28c orthogonal to the optical axis of the main optical system 3. This positioning means 28
Can be engaged with a holding cylinder 4a that integrally holds the sub optical system 4, and the optical axis of the sub optical system 4 is aligned with the optical axis of the main optical system in the extended position at the time of engagement. Moreover, the sub optical system 4 is positioned at a predetermined position in the optical axis direction. This optical axis alignment holding tube 4a is formed by inserting a small tube 4c projecting from the front end surface 4b into the inner tube surface 28a of the positioning means 28, and positioning in the optical axis direction is performed by positioning the end surface 4b of the holding tube 4a. This is done by contacting the contact surface 28c of the means 28.

The drive member 27 is axially slidably supported by a fixed shaft 10g planted in the base plate 10 via a bearing portion 27a so as to be slidable in the axial direction. The drive member 27 has an inner circumferential groove 27 that accommodates the sub optical system 4 in a loosely fitted state.
b is formed. A collar 4d is provided on the outer circumference of the holding cylinder 4a of the sub-optical system 4 over the entire circumference, and the inner circumferential groove 27b and the collar 4d are provided.
A coil spring 29 is inserted between d and. The spring 29 functions to attach the sub optical system 4 brought to the insertion position in the direction of contacting the positioning means 28. A cam gear 26 is also supported by the shaft 10g, and a front cam 26a formed on this end face has a sliding contact portion 2 provided at one end of a drive member 27.
7c can be slid on. Collars 10h and 10i are fixedly mounted on the shaft 10g so as to sandwich the bearing portion 27a, and a spring 30 is inserted between the collar 10h and the drive member 27. The spring 30 presses the sliding contact portion 27c of the drive member 27 against the cam 26a or the bearing portion 27a.
It works by pressing the front end face of the to the tsuba 10i. Locking members 10j and 10k for locking the free end 27d of the driving member 27 are implanted in the base plate 10, and the locking member 10j drives the driving member 27 when the sub optical system 4 is brought to the insertion position. Locking the rocking of
10k locks the swing of the drive member 27 when the sub optical system 4 is brought to the retracted position. Further, near the end of the locking member 10k, there is provided a circular hole 10l into which the small cylinder 4c of the sub optical system 4 brought to the retracted position falls in a loosely fitted state.

FIG. 5 shows a state in which the sub optical system 4 is in the insertion position and in the complete insertion position in which the sub-optical system 4 is engaged with the positioning means 28. The sub optical system 4 also takes the following positions. That is, although in the insertion position, the incomplete insertion device that is pushed up by the front cam 26a and does not engage with the positioning means 28 is on the circular hole 10l, but its small cylinder 4c is pushed up by the front cam 26a. Incomplete retracted position that has not fallen into the circular hole 10l,
The small cylinder 4c is in the completely retracted position where it has fallen into the circular hole 10l.

FIG. 6 shows a cam diagram of the cam 26a. Cam 26a
Is the first flat section A where the rotation angle Θ is 0 to Θ1 and the head does not change at 0, and the head h is 0 from Θ1 to Θ2.
From the first slope section B that increases linearly from 1 to h1 and the second flat section C where the head h does not change at h1 from Θ2 to Θ3
And a second slope section D in which the head h decreases linearly from h1 to 0 from Θ3 to 360 °.

The cam 26a has three functions with respect to the sub optical system 4. The first is the action of displacing the sub optical system 4 in the optical axis direction of the main optical system 3 between the completely inserted position and the incompletely inserted position. The second is the action of displacing the sub optical system 4 in a direction crossing the optical axis of the main optical system 3 between the incompletely inserted position and the incompletely retracted position. The third is the action of displacing the sub optical system 4 in the optical axis direction of the main optical system 3 between the incomplete retracted position and the complete retracted position. Details will be described later.

FIG. 3 shows a viewfinder optical system switching mechanism. The first finder optical system 5 is at the insertion position.

As shown in the figure, a rack 51 is erected on the back surface of the base plate 10, and the rack 51 is mounted on a guide shaft 51a whose base end is planted in contact with the base plate 1c and whose front portion is loosely fitted to the base plate 10. You are being guided.

A pinion 52a fixed to the lower end of the transmission member 52 meshes with rack teeth 51b engraved on the rack 51, and a spur gear 52b at the upper end of the transmission member 2 is fixed to a cam plate 53 to a reduction gear 53a. Have been meshed with.

A cam groove 54 is formed on the upper surface of the cam plate 53, and a driving tooth 53b and a sliding edge 53d which are continuous with one tooth from the starting tooth 53b and the starting tooth 53b are formed on the peripheral edge.

The switching drive member 55 is disposed near the cam plate 53 and the swing shaft 55a
It is provided so as to be pivotally supported in the finder storage section 1a via the. The switching drive member 55 is a fan-shaped portion having a start tooth 53b of the cam plate 53, a start tooth 55b corresponding to the drive tooth 53c, and a drive tooth 55c.
55d, a cam portion 55g composed of a first cam surface 55e which is formed around the swing shaft 55a in a substantially radial direction and a second cam surface 55f which is a circumferential surface, and a cam portion 55g which extends radially from the swing shaft 55a. And a swing arm 55h.

Then, the first objective lens 56 is fixed to the tip of the support arm 55i extended upward from the tip of the swing arm 55h,
The first objective lens 56 constitutes a first finder optical system. The switching drive member 55 is urged clockwise by a spring 55j stretched between the switching drive member 55 and a pin projecting from the finder housing 1a as viewed from above in FIG.

The second objective lens 57 forming the second finder optical system is swingably supported by the rectilinear frame 58 via the pivot shaft 57a, and the rectilinear frame 5
Reference numeral 8 is supported in the finder housing 1a so as to be able to move straight in the optical axis direction of the finder optical path. Second objective lens 57
A spring 58b is stretched between the locking pin 57b protruding downward from the locking pin 58a and the locking pin 58a protruding downward from the rectilinear frame 58, and the second objective lens 57 is seen from above in FIG. The locking pin 57b is urged in the clockwise direction by abutting against the lower side 58c of the rectilinear frame 58 and is held facing the front. Further, the second objective lens 57
An engaging rod 57c projectingly provided on the lower end surface of the switch extends downward, and its tip engages with the cam portion 55g of the switching drive member 55.
The rack 51, the transmission member 52, the cam plate 53, the switching drive member 55, the engagement rod 57c and the like constitute the second finder optical system switching means.

A driven pin 59a protruding from the swing lever 59 is engaged with the cam groove 54 of the cam plate 53. The oscillating lever 59 has its base end pivotally supported by the finder housing 1a via a pivot 59b.
A turnover spring 59d for holding the swing lever 59 in the telephoto position and the wide-angle position is stretched between a pin 59c protruding further from the pivot 59b and a pin 1b fixedly mounted in the finder housing 1a. ing. The cam groove 54 of the cam plate 53 includes a first circumferential groove 54a that does not move the driven pin 59a, a drive groove 54b that moves the driven pin 59a and rocks the rocking lever 59, and a first groove that does not move the driven pin 59a. It is constituted by two circumferential grooves 54c.

A substantially U-shaped split groove 59e is formed at the tip of the rocking lever 59, and a driven rod 58e extending downward from a linear motion connecting arm 58d projecting rearward from the rectilinear frame 58 is formed in the split groove 59e. Is engaged with the tip of the.

FIG. 8 shows a motor control circuit for driving the optical systems 3 and 4 of this embodiment.

In the figure, the motor 12 is driven by three power feeding paths.

The first path is the positive pole of the power supply E-the switch SW3-the switch S.
W7a-motor 12-switch SW7b-path of the negative electrode E. By supplying power through this path, the motor 12
Rotates to displace the main optical system 3 to the retracted position and the sub optical system 4 to the retracted position.

The second path is the positive pole of the power source E-the switch SW4-the switch S.
W8a-motor 12-switch SW8b-negative electrode path of the power supply E. By supplying power through this path, the motor 12
Rotates in the direction opposite to that of the first path to displace the main optical system 3 to the feeding position and the sub optical system 4 to the insertion position.

Here, the switches SW7a, SW7b, SW8a, and SW8b are semiconductor switches whose opening / closing is controlled by a logic circuit 40 (shown in FIG. 9) described later.

The third path is a path connecting the automatic focus adjustment / shutter control circuit 31 and the motor 12, and the output of the control circuit 31 causes the motor 12 to rotate in the reverse direction to move the optical system back and forth in the optical axis direction. Focus on.

The power supply path of this control circuit 31 has switches connected in series.
SW1a and SW5 are inserted. The switch SW1a is a semiconductor switch controlled by the switch SW1 and opened / closed in the same phase as the switch SW1. The switch SW1a is turned on only when a dust cover (not shown) is in the open position. Switch SW5 is the main optical system 3
Is turned on only when is in the extended position and the retracted position (when the sub optical system 4 is in the completely inserted position and the completely retracted position). These prevent the automatic focus adjustment and the shutter from operating when the dust-proof cover and the optical systems 3 and 4 are in positions unsuitable for shooting.

FIG. 9 shows a logic circuit 40 which controls the operation of the motor control circuit of FIG. The logic circuit 40 includes a pair of input terminals 40a and 40b and a pair of output terminals 40c and 40d.
The input terminal 40a is between the switch SW1 and the ground resistance, the input terminal 40b is between the switch SW2 and the ground resistance, and the output terminal
40c is the control terminal of the above switches SW7a and SW7b, and the output terminal 4
0d is connected to the control terminals of the switches SW8a and 8b, respectively. The input terminal 40a becomes High level when the switch SW1 is ON, that is, when the dust cover is in the open position,
Low level when switch SW1 is OFF, that is, when the dustproof cover is in the closed position. Input terminal 40b is a switch SW
When 2 is ON, that is, when the focal length selection member 2 is in the telephoto position, the level is High, and when switch SW2 is OFF, that is, the focal length selection member 2 is in the wide-angle position, the level is Low. The output terminal 40c turns on both of the switches SW7a and SW7b when it is at high level, and turns off both when it is at low level. Output terminal 40d is the above switch SW8 when High level
Turn on both a and SW8b, and turn off both at Low level.

The input terminal 40a of the logic circuit 40 is connected to one input terminal of the exclusive OR circuit 40e and one input terminal of the NOR circuit 40f. The input terminal 40b is connected to the other input terminal of the exclusive OR circuit 40e and the other input terminal of the NOR circuit 40f. The output terminals of both circuits 40e and 40f are connected to both input terminals of the OR circuit 40g, respectively. The output terminal of the OR circuit 40g is connected to the output terminal 40c of the logic circuit 40 and the input terminal of the inverter 40h, and the output terminal of the inverter 40h is connected to the output terminal 40d of the logic circuit 40.

The following table shows the positions of the dustproof cover, the position of the focal length selection member 2, and switches SW1 and SW that switch depending on these positions.
2 state, input terminals 40a, 40b, output terminals 40c, 4 of logic circuit 40
The relationship among the level of 0d, the states of the switches SW7a, SW7b, SW8a, and SW8b, and the positions of the main optical system 3 and the sub optical system 4 is summarized.

(1) As shown in FIG. 1, when the dustproof cover is in the open position, the focal length selection member 2 is in the telephoto position, and the main optical system 3 is already in the extended position, both switches SW1 and SW2 are turned on. Since the input terminals 40a and 40b of the logic circuit 40 are both Hig
It becomes the h level. The output terminals of the exclusive OR circuit 40e and the NOR circuit 40f are at low level, and the output terminal of the OR circuit 40g is also at low level. Output terminals 40c, 4 of logic circuit 40
0d is Low and High level, respectively. As a result, switches SW7a and SW7b shown in Fig. 8 are turned off, and switches SW8a and S7
W8b turns ON. Since the main optical system 3 is in the extended position, the switches SW3, SW4 and SW5 are turned on and off as shown in FIG.
It is in the OFF, ON state. Since the switches SW7a and SW7b are OFF, the first path is not formed, and since the switch SW4 is OFF, the second path is not formed.

In this case, the main optical system 3 is at the feeding position, and the sub optical system 4 is at the fifth position.
As shown in the figure, they are stationary at the fully inserted position where they are completely engaged with the positioning means 28, and both optical systems form a synthetic optical system, and the focal length thereof is in the telephoto range. Since the switches SW1a and SW5 are both ON, the automatic focus adjustment / shutter control circuit 31 is in an operable state, and shooting with the telephoto optical system is possible. FIG. 1 shows the state at this time.

The motor 12 is rotated by receiving power from the third path in response to the shooting start operation, and displaces the optical systems 3 and 4 in the optical axis direction from the close-up of the telephoto region to infinity to perform focus adjustment. During rotation of the motor 12 for focus adjustment in this telephoto region, the front end surface of the bearing portion 27a of the drive member 27 is in contact with the flange 10i by the biasing force of the spring 30, so that the sliding contact portion of the drive member 27 is in contact. 27c
Faces only the first flat section A of the cam 26a and does not make contact therewith. Therefore, the sliding contact portion 27c does not become a load on the motor 12.

The finder optical system is also in the telephoto state as shown in FIGS. 10 and 14 (A) with the first objective lens 56 positioned in front of the second objective lens 57.

When the base plate 10 of both the main optical system 3 and the sub optical system 4 is displaced back and forth to adjust the focus for telephoto shooting, and the cam plate 53 is thereby rotated, the vertical movement rod 58e of the rectilinear frame 58 causes the swing lever 59 to move.
Is fixed by being sandwiched between one inner wall of the split groove 59e and the rear end of the guide groove 1f provided in the finder storage portion 1a, and the starting tooth 53b of the cam plate 53 and the starting tooth 55b of the switching drive member 55.
And the driven pin 59a of the swing lever 59 moves within the range of the first circumferential groove 54a of the cam groove 54 of the cam plate 53, and the driven pin 59a of the side wall of the first circumferential groove 54a moves. Since it does not come into contact, the finder optical system does not operate and are not switched or vibrated.

(2) When the focal length selection member 2 is switched to the wide-angle position from the state shown in FIG. 1, the switch SW2 is turned off,
The input terminal 40b of the logic circuit 40 becomes Low level. Since the output terminal of the exclusive OR circuit 40e is at the High level, the output terminal of the OR circuit 40g is inverted to the High level, and the output terminals 40c and 40d of the logic circuit 40 are inverted to the High and Low levels, respectively. This allows the switches SW7a and SW7 shown in FIG.
b turns on and switches SW8a, SW8b, turn off. Since the main optical system 3 is in the extended position, the switches SW3, SW4, and SW5 are in the ON, OFF, and ON states, respectively, as shown in FIG. 3, and the switches SW7a and SW7b are in the ON states. A path is formed and the motor 12 is activated. Therefore, the main optical system 3 starts to be displaced from the feeding position toward the feeding position.

The sub-optical system 4 is displaced in the optical axis direction from the complete insertion position (shown in FIG. 5) in which the positioning means 28 is engaged by the initial rotation of the motor 12 to the incomplete insertion position in which it is not engaged. Displace. The displacement in the optical axis direction is caused by the cam 26a rotating clockwise from the state shown in FIG. 3 and pushing up the sliding contact portion 27c of the drive member 27 in the first slope section B. Positioning means when the sub optical system 4 reaches the incompletely inserted position
When the drive member 27 is disengaged from the optical axis 28, the drive member 27 can be swung in a direction traversing the optical axis. Therefore, with the subsequent rotation of the motor 12, the sliding contact portion 27c is pushed by the first slope surface section B and the main optical axis. The system 3 is swung clockwise in a plane that intersects the optical axis. At this time, the end surface of the small cylinder 4c of the sub optical system 4 swings in the same direction while sliding on the back surface 10m of the base plate 10 which is perpendicular to the optical axis of the main optical system 3. When the main optical system 3 approaches the retracted position, the free end 27 of the drive member 27
The d contacts the locking member 10k and is prevented from swinging, and the sub optical system 4 reaches the incomplete retracted position where it is not inserted into the circular hole 10l. After that, the motor 12 continues to rotate, so the drive member
The sliding contact portion 27c of 27 ascends the first slope section B of the cam 26a and reaches the second flat section C. Continue to slide contact part 27c
Slides down the second slope section D, but in the middle of that
Since the front end surface of 27a abuts on the collar 10i, the sliding contact portion 27c separates from the cam 26a and faces the first flat section A, but comes into a non-contact state. Due to this displacement of the drive member 27 in the optical axis direction, the small cylinder 4c of the sub optical system 4 is inserted into the circular hole 10l of the base plate 10, and the end surface 4b of the holding cylinder 4a abuts on the edge of the circular hole 10l. Reach the full evacuation position. At this time, the main optical system 3 has reached the retracted position.

The spring 29 supplies the biasing force for inserting the sub optical system 4 into the circular hole 10l after the drive member 27 stops the displacement in the optical axis direction by the front end surface of the bearing portion 27a contacting the collar 10i. .

When the main optical system 3 reaches the retracted position, the switches SW3, SW4 and SW5 shown in FIG. 4 are turned off and on, respectively. When the switch SW3 is turned off, the first path is cut off and the power supply to the motor 12 is stopped. Therefore, since the main optical system 3 is stationary at the retracted position and the sub optical system 4 is stationary at the completely retracted position, the optical system is composed of only the main optical system 3 and its focal length is in a wide-angle region. Also, switches SW1a and Sw5 are both ON
Therefore, the automatic focus adjustment / shutter control circuit 31 is in an operable state, and photographing with the wide-angle optical system is started.

The motor 12 is rotated by receiving power from the third path in response to the image capturing start operation, and displaces the main optical system 3 in the optical axis direction from the close-up of the wide-angle region to the infinity to perform focus adjustment. During the rotation of the motor 12 for focus adjustment in this wide-angle region, the sliding contact portion 27c of the drive member 27 only faces the first flat section A and does not come into contact therewith. The optical system 4 remains in the completely retracted position.

Then, the finder optical system is switched by the finder optical system switching mechanism in the following manner in response to the change of the state. That is, the first finder optical system 5 is moved from the insertion position to the retracted position.

Since the base plate 10 is largely retracted because the telephoto state is switched to the wide-angle state, the rack 51 is largely retracted and the rack teeth are moved.
The cam plate 53 is largely rotated by the path of the 51b, the pinion 52a, the spur gear 52b, and the starting tooth 53b. This activates the tooth 53
b pushes the start tooth 55b of the fan-shaped portion 55d of the switching drive member 55, and the drive tooth 53c and the drive tooth 55c mesh with each other, between the start tooth 53b and the drive tooth 53c, and between the start tooth 55b and the drive tooth 55c. Since one tooth is missing, it starts meshing smoothly without interference.

Then, as shown in FIG. 11, since the switching drive member 55 is rotated, the tip end portion of the engaging rod 57c is pushed by the first cam surface 55e, and the second objective lens 57 is centered on the swing shaft 57a. Then, when the tip end of the engaging rod 57c reaches the second cam surface 55f, the second objective lens 57 is held at a constant angle when it rotates counterclockwise by a set angle when viewed from above in FIG. In synchronization with the angular displacement of the second objective lens 57, the first objective lens 56 moves the switching drive member 55.
Along with the cam 55g, an arc is drawn, and the second objective lens 5
When 7 is facing the front, it moves by grabbing the end and becomes the state shown in FIG. 12 and FIG. 14 (B).

Thereafter, the driven pin 59a of the swing lever 59 reaches the area of the drive groove 54b from the first circumferential groove 54a of the cam groove 54. Then, the swing lever 59 rotates clockwise around the pivot 59b as viewed from above in FIG. 3, whereby the split groove 59e, the driven rod 58e,
The rectilinear frame 58 is pushed forward through the linear motion connecting arm 58d. When the rectilinear frame 58 is pushed forward, the tip end of the engagement rod 57c is disengaged from the second cam surface 55f of the switching drive member 55, so that the second objective lens 57 faces the front as before and the cam portion 55 is returned.
The rectilinear frame 58 and the second objective lens 57 without interfering with g.
Is the first objective lens 56 instead of the first objective lens 56.
It is pushed out to the position of 56, and the swing lever 59 is reversed and held in the wide-angle position by the turnover spring 59d, as shown in FIGS.
The state shown in FIG. 3C is obtained, and the wide-angle viewfinder optical system is obtained.

In the wide-angle state, even if the cam plate 53 is rotated for focus adjustment, the driven pin 59a is the vertical movement rod 58e of the rectilinear frame 58 and the guide provided on the inner wall of the split groove 59e of the swing lever 59 and the finder storage portion 1a. The driven pin 59a of the rocking lever 59 moves within the range of the second circumferential groove 54c of the cam groove 54 of the cam plate 53, and is fixed between the second end and the front end of the groove 1f.
The driven pin 59a does not come into contact with the side wall of the circumferential groove 54c, and the driven pin 59a moves within the area of the second circumferential groove 54c of the cam groove 54, so that the swing lever 59 does not swing. Without
Since the ends of the drive teeth 5c of the fan-shaped portion 55d of the switching drive member 55 are in sliding contact with the sliding contact edge 53d of the cam plate 53, the second objective lens 57 is not displaced and is stably held.

FIG. 7 is a diagram showing the relationship between the amount of extension of the base plate 10 and the switching states of the photographing optical system and the finder optical system. The state X of the image pickup optical system and the state Y of the finder optical system are made to correspond to each other. The telephoto state is represented by W and the wide-angle state is represented by T.

As shown in the figure, in the area (a) where the extension amount of the base plate 10 is small, both the photographing optical system and the finder optical system are in a stable wide-angle state, and the base plate 10 is infinite in the area (a). It is possible to move between the far ∞ and the close range N in the wide angle state. When the operation for switching the state is performed, both optical systems are set to the telephoto state via the area (b), the stable telephoto state is set in the area (c), and the infinity ∞ and the telephoto state are set in the area (c). Can be moved to and from the closest distance N. The same applies when switching from the telephoto state to the wide-angle state.

(3) When the dust cover is displaced from the open position to the closed position from the telephoto state, switch SW1 turns off and the logic circuit
The input terminal 40a of 40 goes low and the output terminal of the exclusive OR circuit 40e goes high. The following operation is the same as in (2). Even though the focal length selection member 2 is at the telephoto position, the main optical system 3 is displaced from the extended position toward the retracted position, and the sub optical system 4 is at the fully inserted position. To the complete retracted position. When the main optical system 3 is displaced to the retracted position, the dustproof cover can be displaced to the closed position. Switch SW1 when the dustproof cover reaches the closed position
Since the switch SW1a having the same phase as is turned off, the power supply to the automatic focus adjustment / shutter control circuit 31 is cut off, and shooting is impossible.

Similarly, also in the finder optical system, switching from the telephoto position to the wide-angle position is performed.

(4) When the dust cover is displaced from the wide-angle state to the closed position, the switch SW1a, which is in phase with the switch SW1, is turned off, so the power supply to the automatic focus adjustment / shutter control circuit 31 is cut off and photography is impossible. Become.

(5) When the focal length selection member 5 is switched from the wide angle state to the telephoto position, the switch SW2 is turned on and the logic circuit 4
The 0 input terminals 40a and 40b are both at the high level. Both output terminals of exclusive OR circuit 40e and NOR circuit 40f are Low
Since it becomes the level, the output terminal of the OR circuit 40g is inverted to the Low level, and the output terminals 40c and 40d of the logic circuit 40 are respectively Lo
Inverts to w, High level. As a result, the switches SW7a and SW7b shown in FIG. 8 are turned off, and the switches SW8a and SW8b are turned on.
Becomes Since the main optical system 3 is in the retracted position, switch SW
3, SW4 and SW5 are in OFF, ON and ON states, respectively. Since the switches SW8a and SW8b are ON and the switch SW4 is ON, the second path is formed, and the motor 12 starts rotating in the direction opposite to that in (2). Therefore, the main optical system 3 starts to be displaced from the feeding position toward the feeding position.

By the initial rotation of the motor 12, the sub optical system 4 is displaced in the optical axis direction from the completely retracted position, comes out of the circular hole 10l, and is displaced to the incomplete retracted position (shown in FIG. 8). This displacement in the optical axis direction is caused by the rotation of the cam 26a and the driving member 2 in the second slope section D.
This is because the sliding contact portion 27c of 7 is pushed up. When the sub optical system 4 comes out of the circular hole 10l, the drive member 27 can swing in the direction crossing the optical axis of the main optical system 3. Continued motor 12
Since the sliding contact portion 27c is pushed by the second inclined surface section D in the direction crossing the optical axis with the rotation, the driving member 27 swings in the same direction, and the end surface of the small tube 4c of the sub optical system 4 is moved to the base. Back side of board 10m
While sliding up, move from the incomplete retracted position to the incomplete inserted position. When the main optical system 3 approaches the feeding position, the driving member 27
The free end 27d contacts the locking member 10j and is prevented from swinging, and the sub optical system 4 stops at the incomplete insertion position. Since the motor 12 continues to rotate after that, the sliding contact portion 27 of the drive member 27
c climbs up the second slope section D of the cam 26a and reaches the second flat section C. Subsequently, the sliding contact portion 27c slides down the first slope section B, and the front end surface of the bearing portion 27a is in the middle of the sliding contact portion 27c.
Since it comes into contact with 0i, the sliding contact portion 27c moves away from the cam 26a,
The flat section A is brought into contact with the flat section A but is not in contact therewith. Due to this displacement of the drive member 27 in the optical axis direction, the small cylinder 4c of the holding cylinder 4a of the sub optical system 4 comes into contact with the guide surface 28b of the positioning means 28 and is guided by the guide surface 28a. When inserted, the end surface 4b of the holding cylinder 4a contacts the contact surface 28c of the positioning means 28, reaches the complete insertion position shown in FIG. 5, and the positioning of the sub optical system 4 is completed. At this time, the main optical system 3 has reached the delivery position.

The bearing member 27a comes into contact with the collar 10i, so that the driving member 27
The spring 29 supplies a biasing force for engaging the sub optical system 4 with the positioning means 28 after the stop of the displacement in the optical axis direction.

When the main optical system 3 reaches the extended position, the switches SW3, SW4, and SW5 are turned on, off, and on, respectively, as described in (1). When the switch SW4 is turned off, the second path is cut off and the power supply to the motor 12 is stopped. Therefore the first
As shown in the figure, the main optical system 3 is at the extended position and the sub optical system 4
Are stationary at the full insertion position, and a synthetic optical system is formed, and the focal length thereof is in the telephoto range. Also switch SW
Since both 1a and Sw5 are ON, the automatic focus adjustment / shutter control circuit 31 is in an operable state, and shooting with the telephoto optical system is possible.

The finder optical system is switched from the wide-angle state to the telephoto state according to the switching operation.

That is, when the main optical system 3 and the sub optical system 4 are switched to the telephoto state, the base plate 10 greatly moves forward, so that the cam plate 53 largely rotates contrary to the above. As a result, the driven pin 59a of the rocking lever 59 moves the second circumferential groove 54c of the cam groove 54.
From the state to the drive groove 54b, the swing lever 59 rotates counterclockwise from the state shown in FIG. 13 and FIG. 14 (C), and pulls back the second objective lens 57 and the rectilinear frame 58.

When the second objective lens 57 and the rectilinear frame 58 retract, the tip end of the engaging rod 57c abuts on the second cam surface 55f of the cam portion 55g of the switching drive member 55, and the second objective lens 57 is centered on the swing shaft 57a. The state shown in FIG. 12 and FIG. 14 (B), which is held in a state of being tilted at an angle, is obtained.

In synchronization with this, the drive teeth 53c mesh with the drive teeth 55c, the switching drive member 55 is rotated clockwise, and the first objective lens 56
Rotates in an clockwise direction around the swing shaft 55a,
The state shown in FIG. 1 and FIG. 14 (A) is obtained. Next, the tip of the engaging rod 57c reaches the first cam surface 55e of the cam 55g,
Finally, the second objective lens 57 faces the front, and the rectilinear frame 58 returns to the front of the front of the second objective lens 57 and enters the telephoto state shown in FIG.

(6) Switch SW1 turns on when the dust cover is displaced toward the open position from the state where the dust cover is covered in the telephoto state.
And the input terminals 40a and 40b of the logic circuit 40 are both Hig.
It becomes the h level. The following is the same operation as described in (5).

According to the above-described embodiment, since the switching of the photographing optical system, the switching of the finder optical system, and the focus adjustment can be performed by sequentially utilizing the rotation of one motor, a plurality of drive sources can be used with a single drive source. There is an advantage that the camera can be driven and the camera can be downsized.

FIG. 15 shows another embodiment of the present invention. In the embodiment, the second objective lens 57 is moved forward instead of the first objective lens 56, whereas the first objective lens is simply moved forward. Was designed to escape.

That is, FIG. 15 (A) shows a wide-angle state,
The first objective lens 60 is a concave lens. To set the telephoto state, the second objective lens 57 is moved to the first position as shown in FIG.
The first objective lens 60 is displaced in an arc after being tilted so as to retract from the movement trajectory of the objective lens 60, and after the first objective lens 60 escapes, the second objective lens as shown in FIG. 15 (C). The 57 is returned so that it faces the front.

[Advantages of the Invention] According to the optical system switching type camera of the present invention, when the finder optical system is switched according to the switching of the photographing optical system, one of them is temporarily tilted so as not to interfere with the plurality of finder optical systems. By displacing the other while displacing the other, the finder optical system can be switched even in a narrow space, and the camera can be made convenient without increasing the size of the camera. Moreover, there is no restriction on the design because it does not appear on the appearance.

[Brief description of drawings]

1 to 14 show an embodiment of the present invention. FIG. 1 is a vertical sectional view of a camera, FIG. 2 is a horizontal sectional view of a camera, and FIG.
The figure is a perspective view of the internal mechanism of the camera, Fig. 4 is a perspective view of the photographing optical system switching mechanism, Fig. 5 is a sectional view of the main parts, Fig. 6 is a cam diagram, and Fig. 7 is the amount of extension of the base plate 10. And FIG. 8 is a diagram showing the relationship between the switching states of the photographing optical system and the finder optical system, FIG. 8 is a motor control circuit diagram for driving the optical system, FIG. 9 is a logic circuit diagram for controlling the operation of the motor control circuit, and FIG. The figure is a plan view of the viewfinder optical system switching mechanism in the telephoto state.
The same figure is a plan view of the intermediate state, FIG. 13 is a plan view of the same wide-angle state, FIG. 14 is an explanatory view showing the switching state of the finder optical system, and FIG. 15 is the switching state of the finder optical system of another embodiment. FIG. 1 ... Camera body, 1a ... Finder housing 3 ... Main optical system, 4 ... Sub optical system 10 ... Base plate, 12 ... Motor 26 ... Cam gear, 27 ... Driving member 51 ... Rack, 53 …… Cam plate 55 …… Switching drive member, 56 …… First objective lens 57 …… Second objective lens

Claims (2)

[Claims] 1. A photographic optical system capable of switching optical functions, a first finder optical system displaceable between an insertion position in a finder optical path and a retracted position from the optical path, and the first finder optical system. A second finder optical system that can be displaced from a position inside the displacement locus to a position outside the displacement locus, and the first finder optical system between the insertion position and the retracted position in conjunction with the switching operation of the photographing optical system. The first finder optical system driving means for displacing and the second finder optical system on the optical axis formed by the second optical system while the first finder optical system is displaced in association with the switching operation of the photographing optical system. An optical system switching type turtle comprising: a second finder optical system driving means for displacing the first optical system so as to temporarily retract from the position inside the displacement locus to the position outside the locus by rotating the first rotation as a fulcrum. La. 2. The second finder optical system is displaced between the in-trajectory position and the out-trajectory position, and
The optical system according to claim 1, further comprising a second finder optical system driving means for locating the second finder optical system at the insertion position of the first finder optical system when the finder optical system is at the retracted position. System switching type camera.