JP2512883B2 - camera - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly to a camera capable of switching the optical state of a photographing optical system.

[0002]

2. Description of the Related Art Conventionally, there is known a camera capable of switching the state of a photographing optical system between a first optical state and a second optical state by displacing the photographing optical system in the optical axis direction. . For example, the first optical state has a wide focal length,
The second optical state is telephoto. Further, the switching of the optical state is performed by the forward / reverse driving of the motor.

[0003]

[0004]

In such a camera in which the optical state of the photographing optical system can be switched by the motor, the direction of rotation is instructed to the motor depending on which optical state is switched to the other optical state. There must be. The motor is started by operating a starting switch, but providing a switch for each rotation direction complicates the structure and increases the cost of the camera. Alternatively, it is necessary to operate the switch according to the switching direction of the optical state, which causes a problem of erroneous operation.

The present invention aims to solve the above problems, and provides a camera which has a simple structure and which can switch the optical state to reduce the cost.

[0006]

The gist of the present invention for achieving the above object is to provide a first position which is a first optical state in which photographing is possible, and a second position which is different from the first optical state.
A photographing optical system (3, 4) that can be displaced between a second position that is in an optical state, and a drive device (12, 4) that drives the photographing optical system between the first position and the second position. 13, 1
4), a detection device (61) for detecting and outputting whether the photographing optical system (3, 4) is in the first position or the second position, and the photographing optical system (3, 4). ) Is operated to switch the optical state and the switch (254) returns to a non-operating state when the operation is released, and the detection device (61) each time the switch (254) is operated.
The driving device (1) drives the photographing optical system (3, 4) to the second position when the photographing optical system (3, 4) is in the first position, and to the first position when the photographing optical system (3, 4) is in the second position.
2, 13, 14 ...) and a control circuit for activating the same.

[0007]

The photographic optical system (3, 4) includes a first position which forms a first optical state in which photography is possible and a second position which is different from the first optical state.
It is displaceable between the second position and the optical position. This displacement is performed by the drive device (12, 13, 14 ...). The detection device (61) detects and outputs whether the photographing optical system (3, 4) is in the first position or the second position, and when the switch (254) is operated, the switch is activated. Each time an operation is applied to (254), the control circuit is in the second position and in the second position when the photographing optical system (3, 4) is in the first position by the output of the detection device (61). At times, the drive device (12, 13, 14, ...) Is activated so as to drive to the first position.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 3 to 7, on the front surface of the camera body 1, a dustproof cover 2 is provided in the left-right direction in FIGS. 3 to 5, and a main optical system 3 constituting a photographing optical system is in the optical axis direction thereof. (Fig. 3 ~
It is provided so as to be displaceable in the vertical direction (in FIG. 5), that is, to be able to be extended and retracted. Inside the camera body 1, a sub optical system 4 that constitutes a photographing optical system together with the main optical system 3 is provided.
It is provided so as to be displaceable in a direction crossing the optical axis of the main optical system 3 (left-right direction in FIGS. 3 to 5) between a position inserted into the light beam of the main optical system 3, that is, a shooting light beam and a position retracted from the light beam. ing.

A focal length selection member 5 for switching the focal length of the photographing optical system is provided on the upper surface of the camera body 1 so as to be always operable.

In FIG. 3, the dustproof cover 2 is in the open position. The focal length selection member 5 is located at a telephoto position where the focal length of the main optical system 3 is set to a telephoto region, and faces the letter “T” attached to the upper surface of the camera body 1. The main optical system 3 is located at a projecting position protruding from the front surface of the dustproof cover 2 and constitutes a synthetic optical system together with the sub optical system 4 located at the insertion position and has a focal length in the telephoto area.

In FIG. 4, the dustproof cover 2 is in the open position. The focal length selection member 5 is located at a wide-angle position where the focal length of the main optical system 3 is set to a wide-angle region, and faces the character “W” attached to the upper surface of the camera body 1. At this time, the main optical system 3
Is in the retracted position in which the camera body 1 is retracted from the retracted position, and the sub optical system 4 is in the retracted position. Main optical system 3
Is the focal length in the wide-angle range.

In FIG. 5, the dustproof cover 2 is in the closed position and covers the main optical system 3. At this time, the main optical system 3
Is in the retracted position even though the focal length selection member 5 is in the telephoto position, and the sub optical system 4 is in the retracted position. When the dustproof cover 2 is in this closed position, an index 2a attached to the upper surface of the dustproof cover 2 is attached to the upper surface of the camera body 1 in order to make it possible to visually recognize from the upper part of the camera that photography is impossible. The displayed character is "OFF".

As can be seen in FIG. 3, a switch SW1 interlocking with the dust cover 2 and a switch SW2 interlocking with the focal length selection member 5 are provided in the camera body 1.

The switch SW1 comprises a sliding piece 2b fixed to the dustproof cover 2 and a conductor land 2c fixedly mounted on the camera body 1.
When the dustproof cover 2 is in the open position, it is turned on, and when it is displaced from the open position to the closed position, it is turned off. The switch SW1 controls the rotation direction of a motor 12 described later that displaces the main optical system 3 and also controls power supply to a shutter control circuit 31 described later.

The switch SW2 is composed of a slide piece 5a fixed to the focal length selection member 5 and a conductor land 5b fixedly mounted on the camera body 1. The switch SW2 is switched according to the position of the focal length selection member 5, The rotation direction of a motor 12, which will be described later, that displaces the optical system 3 is controlled. The switch SW2 is turned on when the focal length selection member 5 is in the telephoto position and is turned off when it is in the wide-angle position.

An inverted Galilean finder optical system including a first finder optical system 6 having a positive refracting power and a second finder optical system 7 having a negative refracting power is provided in the finder storage portion 1a above the camera body 1. It is stored and provided.

The finder optical system as a whole is narrowed at the front and narrowed at the back, and a substantially trapezoidal space is formed in the finder housing 1a adjacent to the narrowed portion of the finder optical system.

On both sides of the finder optical system are AF (automatic focus adjustment) optical systems 8a and 8b. A projecting element 8c is provided after the AF optical system 8a, and after the AF optical system 8b. Is provided with a light receiving element 8d.

FIG. 2 is a perspective view showing the main optical system displacement mechanism, finder switching mechanism and other internal mechanisms of this embodiment.

An aperture 10a through which a photographing light beam passes is provided in the central portion of the base plate 10, a main optical system 3 is attached to the front portion of the aperture 10a, and thereafter, a diaphragm / shutter device 11 shown by an imaginary line. Is installed. FPC (flexible printed circuit board) for transmitting control signals from the aperture / shutter device 11
FPC11a has been extended.

A motor 12 is fixedly mounted on the upper back surface of the base plate 10, and a bevel gear 12a is fixedly mounted on one end of its rotating shaft. A gear 13 pivotally supported by the base plate 10 meshes with the bevel gear 12a, and a spur gear integrated with the gear 13 meshes with a gear 14. The gear 14 is held by a holding arm erected on the base plate 10 so as to be rotatable but immovable in the axial direction.

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 and is shown in FIG.
As can be seen from 0, the end is inserted into the base plate 1c of the camera body 1 and is fixed non-rotatably by the set screw 15a, and the tip side is axially aligned with the through hole 10b (shown in FIG. 10) of the base plate 10. It is slidably inserted, and the leading edge is inserted into the camera body 1.

A guide shaft 16 extending in the optical axis direction is also installed on the substrate 1c. The guide shaft 16 is fitted in the notch 10c of the base plate 10 so as to be slidable in the axial direction.

A linear cam plate 17 is mounted on the base plate 10.
Is fixed at its base along the moving direction (direction of the optical axis of the main optical system 3), the linear cam plate 17 has a spring property, and a sliding contact portion 17a is formed at its tip. The sliding contact portion 17a is slidably pressed against a fixed wall surface (not shown) extending from the substrate 1c along the moving direction of the base plate 10.

With such a structure, when the motor 12 rotates, the base plate 10 is translated in the direction of the optical axis by the screw engagement between the gear 14 and the guide shaft 15, and the main optical system 3 fixed to the base plate 10 and the aperture / cumulative function. The shutter device 11 is displaced in the optical axis direction between the delivery position and the delivery position. At this time, by fitting the guide shaft 16 and the notch 10c, the base plate 10 is prevented from rotating in a plane orthogonal to the optical axis. Further, the sliding contact portion 17a of the cam plate 17 makes elastic contact with the fixed wall surface, so that the guide shaft 16 and the notch 10c come into contact with each other without backlash. Therefore, the base plate 10 does not decenter the optical axis of the main optical system 3 but moves parallel to the optical axis direction while keeping the optical axis vertical.

A reduction gear train 25 and a cam gear are provided on the back surface of the base plate 10.
26 and a drive member 27 are pivotally supported, and the sub-optical system 4 is screwed and held on the drive member 27 via a support tube 4e.
The input gear 25a of the reduction gear train 25 meshes with a spur gear that is integral with the gear 13 described above, and is the final gear 25b of the reduction gear train 25.
Meshes with the cam gear 26.

The cam gear 26 and the driving member 27 are coaxial with each other, and both of them are a front cam 26a provided on the end surface of the cam gear 26.
Are connected through.

The reduction ratio of the reduction gear train 25 is set as follows. That is, when the main optical system 3 is at the extended position, the sub-optical system 4 is inserted in the photographing light beam (see FIG. 2).
(Indicated by a solid line in FIG. 2) when the main optical system 3 is in the retracted position. .

8 and 9 are detailed sectional views of the sub-optical system inserting / removing mechanism.

In the figure, 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. ing. The positioning means 28 includes an inner cylindrical surface 28a having an optical axis of the main optical system 3 as an axial center, a guide surface 28b in the shape of a platter, and the main optical system 3.
And a contact surface 28c orthogonal to the optical axis of.

A holding tube 4a for integrally holding the sub optical system 4 can be engaged with the positioning means 28, and the optical axis of the sub optical system 4 is in the extended position at the time of the engagement. 3 and the sub optical system 4 is positioned at a predetermined position in the optical axis direction.

This optical axis alignment is performed by inserting a small tube 4c protruding from the front end surface 4b of the holding tube 4a into the inner tube surface 28a of the positioning means 28, and the positioning in the optical axis direction is performed.
The end surface 4b of 4a is brought into contact with the contact surface 28c of the positioning means 28.

The drive member 27 is a fixed shaft embedded in the base plate 10.
It is axially slidably supported by 10g via a bearing portion 27a. The driving member 27 is formed with a circumferential groove 27b for accommodating the sub optical system 4 in a loosely fitted state.

A collar 4d is provided on the entire outer circumference of the holding cylinder 4a of the sub optical system 4, and a coil spring 29 is inserted between the inner circumferential groove 27b and the collar 4d. This spring 29
It serves to urge the auxiliary optical system 4 brought to the insertion position in the direction in which it comes into contact with the positioning means 28.

A cam gear 26 is also supported on the shaft 10g,
A sliding contact portion 27c provided at one end of the drive member 27 can be slidably contacted with the front cam 26a formed on this end surface. Collars 10h and 10i are fixed to 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 serves to press the sliding contact portion 27c of the drive member 27 against the cam 26a or press the front end surface of the bearing portion 27a against the collar 10i.

Locking members 10j and 10k for locking the free end 27d of the driving member 27 are planted on the base plate 10.
Is a drive member 27 when the sub optical system 4 is brought to the insertion position.
The lock member 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. 8 shows that the sub optical system 4 is at the insertion position,
Further, the state is shown in the fully inserted position in which the positioning means 28 is engaged. The sub optical system 4 also takes the following positions.

That is, although it is in the insertion position, the front cam
An incomplete insertion position where the small cylinder 4c is pushed up by the front cam 26a but is not pushed down by the front cam 26a, although it is located on the circular hole 10l and is pushed up by the 26a and does not engage the positioning means 28. The small cylinder 4c is in a completely retracted position (shown in FIG. 9) in which the small cylinder 4c has fallen into the circular hole 10l.

FIGS. 11 and 12 are front views of a sub-optical system retrograde preventing mechanism which works in conjunction with the sub-optical system inserting / removing mechanism.

The blocking plate 30a fixed to the blocking gear 30f that meshes with the cam gear 26 includes a first small diameter portion 30b, a first contact surface 30c, a second small diameter portion 30d and a second contact portion which are successively connected. Interface 30
It has e and. First contact surface 30c and second contact surface 30
Each of e and e can be engaged with an engagement portion 27e provided near the bearing portion 27a of the drive member 27.

FIG. 11 shows a state in which the sub optical system 4 is locked at the completely retracted position or the incomplete retracted position, and FIG.
Shows the state of being locked at the complete insertion position or the incomplete insertion position.

FIG. 21 shows a cam diagram of the cam 26a. The cam 26a includes a first flat section A in which the rotation angle Θ is 0 to Θ1 and the head is unchanged at 0, a first slope section B in which the head h is linearly increased from 0 to h1 from Θ1 to Θ2, and Θ2 is It consists of a second flat section C in which the head h does not change at h1 over Θ3, and a second slope section D in which the head h decreases linearly from h1 to 0 over Θ3 to 360 °.

The cam 26a has three functions with respect to the sub optical system 4. The first function is to displace the sub optical system 4 in the optical axis direction of the main optical system 3 between the complete insertion position and the incomplete insertion 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. Third, the sub-optical system 4 is displaced in the optical axis direction of the main optical system 3 between the incomplete retreat position and the complete retreat position. Details will be described later.

As shown in FIG. 2, a rack is provided on the back surface of the base plate 10.
51 are erected. The rack 51 is guided by a guide shaft 51a having a base end planted in the base plate 1c and a front portion loosely fitted to the base plate 10.

The rack teeth 51b engraved on the rack 51 include:
A pinion 52a fixed to the lower end of the transmission shaft 52 is engaged with the transmission shaft 52, and the transmission shaft 52 penetrates a partition plate (not shown) that partitions the photographing optical system from the viewfinder optical system, the AF optical system, etc. There is.

Spur gear 52b fixed to the upper end of transmission shaft 52
Is engaged with a reduction gear 53a, and a cam member 53 as a control member is pivotally supported on the upper end of a shaft 50 of the gear 53a.

A cam plate 71 is fixed to the cam member 53.
(See FIGS. 13 and 14). The cam plate 71 links an active triangulation type automatic focus adjustment (hereinafter referred to as AF) device, which will be described later, with a cam lever 73 and the photographing optical systems 3 and 4. The upper surface of the cam plate 71 is a printed circuit board described later.
A detection brush plate 61 that is in sliding contact with 62 is planted. The brush plate 61 has four brushes 61a, 61b, 61c and 61d which are made of the same conductor and are electrically connected to each other.

A fixing strut 50a is erected on the reduction gear 53a, and a screw 71b inserted into an adjusting long hole 71a formed in the cam plate 71 is screwed onto an upper end of the fixing strut 50a to thereby form a cam plate. 71 and the cam member 53 are integrally combined with the reduction gear 53a.

A gear 50b for suppressing backlash is meshed with the reduction gear 53a, and the gear 50b is biased in the clockwise direction (arrow direction) by the spring 50c. Therefore, the reduction gear 53a is also biased. Backlash between the gears 53a and 52b and between the gears 52a and the rack 51b is suppressed.

A printed circuit board for encoder 62 is arranged above the cam plate 71. The printed circuit board 62 is a cam member 53.
The central portion is locked by the pivot shaft 50 of the
Is provided, and the position is adjusted and fixed by a set screw 62b that is screwed into the screwing emboss formed on the camera body 1.

On the lower surface of the printed board 62, as shown in FIG. 1, a plurality of sliding contact patterns 63 are provided in a concentric pattern centered on the pivot 50.

As the sliding contact pattern 63, a first pattern 63a for grounding, a second pattern 63b for photographing, a third pattern 63c, a fourth pattern 63d, and a fifth pattern 63e are arranged from the inner circumference. Has been done. Corresponding to that the photographing optical system supported by the base plate 10 has a wide-angle area as a first movement range, a transition area as a second movement range, and a telephoto area as a third movement range. , As a whole, the sliding contact pattern 63 has the first circumference.
Wide-angle region W, which is the region of N, and transition region N, which is the second region
And a telescopic area T which is a third area.

The fifth pattern 63e is provided for the telephoto area T for area discrimination, and is arranged in a nested state between the second pattern 63b, the fourth pattern 63d or the third pattern 63c. is there. Terminals 64a to 64e connected to the patterns 63a to 63e are provided at the ends of the printed circuit board 62.

A reference position adjusting pattern for determining the positional relationship between the photographing optical system and the sliding contact pattern 63 on the same outermost circumference as a part of the fourth pattern 63d and the fifth pattern 63e.
63f is provided. Reference position adjustment pattern 63f
Has a width corresponding to the required positioning accuracy, and is an adjustment terminal connected to the reference position adjustment pattern 63f.
64f is provided at the end of the printed circuit board 62. Brushes 61a, 61b, 61c, 61d of the brush plate 61 are provided on each pattern 63a to 63e.
The tips of the are in contact with each other.

The brushes 61a, 61b, 61c, 61d move around the axis 50 in conjunction with the movement of the photographing optical systems 3 and 4 from the infinity position in the wide-angle region to the closest position in the telephoto region. Rotate at an angle of 360 degrees or less. Each brush 61a, 61b, 61c,
Each electric signal output from each of the patterns 63a to 63e changes digitally according to the position where 61d contacts, that is, the position of the photographing optical system. By decoding each of the electric signals, a photographic optical system position signal indicating the position of the photographic optical systems 3 and 4 is obtained. Further, ON / OFF of switches SW3, SW4, SW5 described later is controlled by this photographing optical system position signal.

That is, when each of the brushes 61a, 61b, 61c, 61d comes into contact with the corresponding pattern and becomes conductive, a circuit (not shown) issues a Low signal, and when the brush comes off the pattern and comes into contact with the insulating section, it becomes High. It is assumed that a signal is emitted and the code 63b outputs the code A. Similarly, the pattern 63d outputs the code B and the pattern 63c outputs the code C. The combination of these code outputs is as shown in the following table. Various various step outputs can be obtained.

[0060]

[Table 1]

In any of the wide-angle region W and the telephoto region T, the switching point in steps 8 to 7 is the reset position, which is the starting point of the distance measurement of the photographing optical system, and the wide-angle infinity point a of the cam surface or the telephoto lens described later. It corresponds to the point f at infinity.

The switching points of steps 7 to 6 are non-signal stop positions, and when attempting to shoot an infinity position in the case of active type automatic focusing, the reflected light of the light projecting element is weak and practically does not return. Therefore, the photographing optical system is stopped at the no-signal stop position for photographing.

Steps 6 to 1 are for giving position information to so-called flashmatic control in which the amount of light emitted from the strobe is kept constant when the strobe is used and the shooting conditions are controlled by the aperture.

The switching point in steps 2-1 is the closest distance stop position, and the photographing optical system extended from the telephoto position is stopped here to prevent runaway. In the wide-angle area W, steps 8 to 1 are arranged clockwise, and in the telephoto area T, step 8
To Step 2 and Step 1 is not omitted, and the switching point of Steps 3 and 2 is set as the closest distance stop position.

The respective patterns 63a to 63e are arranged on the outer periphery so that higher precision is required depending on the required precision. This is because the outer circumference has a larger amount of movement with respect to the angular displacement, and thus can be detected with higher accuracy.

That is, the pattern 63a is a ground pattern as long as the brush 61d of the brush plate 61 is simply in sliding contact therewith, and the pattern 63b is used only for flashmatic control and does not require so much positional accuracy. On the other hand, the pattern 63d is where the switching points of steps 7 to 6 are output, and the focal position is greatly affected by a slight lens movement amount at a long distance. How it looks
With reference to FIG. 22, in which the vertical axis represents the diameter of the circle of confusion and the horizontal axis represents the distance, the depth of field in the amount of extension of the taking lens
In the figure, δ is the permissible circle of confusion diameter, and a, a, and u are the depth of field when the permissible circle of confusion diameter δ is at a certain feed amount. A is 5m when the amount of feeding is in focus at 10m
When the amount of extension is such that the focus is in the range up to ∞ and the focus is a little at a distance farther than that, 6m-
It shows that the focus is achieved in the range of ∞, 8 m to ∞.

When the in-focus range moves from A to A and C, the amount of lens extension is very small, and if it is designed up to 5 m, the operable range of the automatic focus adjustment control circuit, that is, If you want to assume the no-signal stop position as the position of a, as the range of focus up to 5 m,
The pattern of the stop signal slightly shifts to a focusing range like a, u, and the subject is 5 to 6 m, or 5 to 8 m.
If it is in between, it will be completely out of focus there.

The pattern 63c also outputs a stop signal and a reset signal at a close range, and therefore requires high accuracy. Also in the pattern 63f, the adjustment of the reference position determines the overall accuracy, and therefore higher accuracy is required. Therefore, these patterns requiring high precision are arranged on the outer periphery.

The switch SW3 has a switch SW5 when the main optical system 3 is at the feeding position, and the switch SW4 has a switch SW5 when the main optical system 3 is at the feeding position.
Is OFF when it is between the feeding position and the feeding position. Switches SW3 and SW4 work as limit switches,
When the main optical system 3 is displaced to the feeding position or the feeding position, the power supply to the motor 12 is cut off.

The switch SW5 is a switch for disabling shutter release when the main optical system 3 is at an intermediate position between the above two positions and a subject image cannot be formed on the film surface, and will be described later. Shutter control circuit 31
It is a switch for cutting off the power supply to (illustrated in FIG. 9).

In FIG. 15 and FIG. 16, the cam member 53
Is a control member of the finder switching mechanism, and a cam groove 54 is engraved in the lower part thereof, and the starting tooth 53b, the driving tooth 53c and the sliding contact edge 53d that are continuous from the starting tooth 53b with one tooth missing. Has been formed.

A switching drive member 55 is provided near the cam member 53 so as to be pivotally supported in the finder accommodating portion 1a via a swing shaft 55a. The switching drive member 55 is the activation tooth 53 of the cam member 53.
b, a fan-shaped portion 55d having a start tooth 55b and a drive tooth 55c corresponding to the drive tooth 53c, a first radial cam surface 55e formed around the swing shaft 55a, and a second circumferential surface. Cam surface 55
A cam portion 55g composed of f and a swing arm 55h radially extended from the swing shaft 55a.

Then, a first objective lens 56 having a positive refracting power is fixed to the tip of a supporting arm 55i extending upward from the tip of the swing arm 55h, and the first objective lens 56 is the first finder optical system. Is doing.

The switching driving member 55 is provided with a spring 55j stretched between the switching driving member 55 and a pin projecting from the finder housing 1a.
Is urged clockwise at.

The second objective lens 57 having a negative refracting power forming the second finder optical system is pivotally supported by a straight holder 58 via a swing shaft 57a so that the straight holder 58 is located inside the finder housing 1a. The finder is supported so that it can move straight in the optical axis direction of the optical path.

An engaging rod 57c extending downward is projectingly provided on the lower end surface of the second objective lens 57, and the tip end thereof is the switching drive member 55.
Is engaged with the cam portion 55g of. The rack 51, the transmission shaft 5
2, the cam member 53, the switching drive member 55, the engagement rod 57c and the like constitute the second finder optical system drive means.

On the other hand, the rack 51, the transmission shaft 52, the cam member 53,
The switching drive member 55 and the like constitute the first finder optical system drive means.

A driven pin 59a projecting from the variable power rocking lever 59 is engaged with the cam groove 54 of the cam member 53. The variable-magnification swing lever 59 has a base end pivotally supported by the main body 1 via a pivot 59b, and a pin 59c projecting from the end extending from the pivot 59b and a pin 1b fixedly mounted on the main body 1. Further, a toggle spring 59d for holding the variable power swing lever 59 at the telephoto position and the wide-angle position is stretched.

The cam groove 54 of the cam member 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 swings the variable power rocking lever 59, and a driven pin. The second circumferential groove 54c does not move 59a.

A substantially U-shaped split groove 59e is formed at the tip of the variable power swing lever 59, and the straight holder 58 is formed in the split groove 59e.
The front end of a vertical movement rod 58e extending downward from a direct-acting connecting arm 58d protruding rearward from the engaging end engages with the linear movement connecting arm 58d.

An AF switching device is shown in FIGS. 2, 13, 14, 17, and 18.

That is, a cam surface is formed on the outer periphery of the cam plate 71 by integral molding with a synthetic resin. As shown in FIGS. 17 and 18, the cam surface has a wide-angle infinity point a to a wide-angle close point. A wide-angle region c up to b, a transition region d, a standby region e, and a telephoto region h from a telephoto infinity point f to a telephoto close-up point g are continuously formed. The directions of the light projecting elements 8c corresponding to the wide-angle infinity point a which is the focusing operation start point of the wide-angle area c and the telephoto infinity point f which is the focusing operation start point of the telephoto area h are set to be the same. However, the wide-angle closest point b and the telephoto closest point g are not the same due to the difference in the photographing limit distance. Further, in this embodiment, since the sub optical system 4 moves integrally with the main optical system 3 in the optical axis direction at the time of insertion, the cam shapes of the wide angle area c and the telephoto area h are not the same, but the sub optical system 4 In a photographing optical system in which only the main optical system 3 is displaced in the optical axis direction without being displaced in the optical axis direction, the cam shape becomes the same except for the vicinity of the closest point. As shown in FIGS. 2 and 13, a driven end 73a of a cam lever 73 pivotally supported by the camera body 1 via a pivot 72 is in sliding contact with this cam surface, and the driven end 73a biases a spring 73b for biasing the cam lever 73. Is constantly pressed against the cam surface.

An engagement pin 73c is fixed to the other end of the cam lever 73, and the engagement pin 73c is attached to the camera body 1 via a pivot 74.
It engages with the engaging arm 75a of the interlocking lever 75 pivotally supported by. A light projecting element holding lever 76 is pivotally supported via a pivot 74 concentrically with the interlocking lever 75.

The interlocking lever 75 is a spring 75 wound around the pivot 74.
It is biased counterclockwise when viewed from above by b, whereby the engagement arm 75a abuts on the engagement pin 73c of the cam lever 73. Since the biasing force of the spring 75b is considerably smaller than the biasing force of the spring 73b, the driven end 73a does not separate from the cam surface of the cam plate 71.

An adjusting eccentric pin 75 is provided at the end of the interlocking lever 75.
c is erected, and the top 75d of the adjusting eccentric pin 75c is inserted into the long hole 76a at the end of the light projecting element holding lever 76. A tension spring 76b is stretched between the engaging arm 75a of the interlocking lever 75 and the end of the light emitting element holding lever 76.

The interlocking lever 75 and the light projecting element holding lever 76 generally operate integrally.
A light projecting element 8c is held by 76, and as shown in FIG. 2, a spring 76c as a whole is urged downward in the figure so as to come into contact with the end surface of the bearing portion of the camera body 1, and is axially supported by the bearing portion. There is.

FIG. 2 further shows an in-finder distance display switching mechanism.

That is, the driven lever 82 is pivotally supported by the camera body 1 via the pivot 81, and the driven pin 82a fixed to one end of the driven lever 82 is formed in the cam groove formed in the linear cam plate 17.
It is engaged with 17b.

A slide lever 83 is connected to the driven lever 82 and slides laterally through pins 84a and 84b provided upright on the camera body 1 and guide holes 83a and 83b formed in the slide lever 83. Supported as possible.

An engaging pin 83c is provided at one end of the slide lever 83.
Is fixed, and the engaging pin 83c is engaged with a fork portion 82b formed at the other end of the driven lever 82.

The slide lever 83 is provided in front of the fixed lens 7a of the finder optical system, and is provided with pointers 83d and 83e which selectively appear in the field of view of the finder.

FIG. 19 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 supply circuits.

The first path is the positive electrode of the power source E-the switch SW.
3-switch SW7a-motor 12-switch SW7b-negative electrode path of the power supply E. When power is supplied 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 electrode of the power source E-the switch SW.
4-switch SW8a-motor 12-switch SW8b-path for the negative pole of the power supply E. By supplying power through this path, the motor 12 rotates in the direction opposite to that in the case of the first path,
The main optical system 3 is displaced to the feeding position and the sub optical system 4 is displaced to the insertion position.

Here, the switches SW7a, SW7b, SW8a, SW8b are
It is a semiconductor switch whose opening and closing is controlled by a logic circuit 40 (shown in FIG. 20) 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 normal and reverse directions to move the optical system in the optical axis direction. Move it back and forth to bring it into focus.

Switches SW1a and SW5 connected in series are inserted in the power supply path of the control circuit 31. Switch SW
Reference numeral 1a is a semiconductor switch controlled by the switch SW1 and opened and closed in the same phase as the switch SW1. The semiconductor switch 1a is turned on only when the dust cover 2 is in the open position. The switch SW5 is turned on only when the main optical system 3 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 2 and the optical systems 3 and 4 are in positions unsuitable for photographing.

FIG. 20 shows a logic circuit 40 for controlling the operation of the motor control circuit of FIG. This logic circuit 40
Is a pair of input terminals 40a, 40b and a pair of output terminals 40c, 40d.
It has and. 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, the output terminal 40c is the control terminal of the switches SW7a and SW7b, and the output terminal 40d is the switch SW8a, Each is connected to the control terminal of 8b.

The input terminal 40a, when the switch SW1 is ON,
That is, when the dust cover 2 is in the open position, it becomes High level, and when the switch SW1 is OFF, that is, the dust cover 2
Low level when is in the closed position. Input terminal 40b
Is at high level when the switch SW2 is ON, that is, when the focal length selection member 5 is in the telephoto position.
When 2 is OFF, that is, when the focal length selection member 5 is in the wide-angle position, it becomes Low level.

The output terminal 40c turns on both the switches SW7a and SW7b when it is at high level, and turns off both when it is at low level.
To Output terminal 40d is the above switch when High level
Turn on both SW8a 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
It 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
It is connected to both input terminals of g. OR circuit 40
The output terminal of g 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.

In the following table, the position of the dustproof cover 2, the position of the focal length selecting member 5, and switching according to these positions,
Switch SW1, SW2 status, logic circuit 40 input terminals 40a, 40
b, output terminal 40c, 40d level, switch SW7a, SW7b, SW8
The relationship between the states of a and SW8b and the positions of the main optical system 3 and the sub optical system 4 is summarized.

[0105]

[Table 2]

FIG. 23 shows a concrete control circuit diagram of the camera of this embodiment.

This control circuit diagram shows a decoder for decoding the output of the encoder and outputting the position information of the photographing optical system.
204, focus detection unit 270, drive unit 280, and switching unit 290
And. The decoder 204 receives signals from the switches 201, 202 and 203 corresponding to the code A, code B and code C output from the encoder as input terminals 201a to 203a, AND gates 205 to 212 and inverters respectively combined with each other.
213 to 224 and output terminals 205a to 212a, the outputs of which are also connected to the aperture control circuit 225.

The focus detecting section 270 is composed of a focus detecting circuit 240, a light emitting LED 243 connected through a transistor 242, and a light receiving element 241 connected.
Are PNP transistors 235 and 236 and NPN transistors 237 and 238 for switching the drive motor 12, and NOR gates 231 and 233 and OR gates for controlling each transistor.
232 and 234 are included in the switching unit 290. The switching unit 290 is an RS including a D-flip-flop 259 and NAND gates 256 and 257.
It has a flip-flop and a delay circuit 260, and has a D-
The telephoto detection switch 258 is connected to the D input terminal of the flip-flop 259 via the terminal 258a, and the output of the delay circuit 260 is input to the NAND gate 257 of the RS flip-flop via the NAND gate 261.
A resistor 255 and an optical system switching instruction switch 254 are connected to 256. The signal of the telephoto detection switch 258 is given by the pattern 63e of the encoder, and the focus detection circuit 240 of the focus detection unit 270 has the OR gate 244 and the NAND gates 228, 22 connected via the inverter 245.
RS flip-flop composed of 9 and AND gate 230
Is connected to the drive unit 280 via. OR gate 244
A reset terminal 244a is connected to. A resistor 227 and a hand switch 226 are connected to the NAND gate 229. The switching unit 290 includes an inverter 262 and an AND gate 26.
It is connected to the drive unit 280 via 3,264. decoder
204 is connected to A through the AND gate 247 and NOR gate 246
Input to the ND gate 230 and the terminal 212a is NAN
It is connected to the D gate 261 and the OR gate 244. Terminal 21
The inverter 2a is connected to the NAND gate 251 of the RS flip-flop composed of the NAND gates 251 and 252 via the inverter 253, and the NAND gate 252 is connected to the photographing optical system reset switch 249 and the resistor 250.

Adjustments performed when assembling the focal length switchable camera having the above-described structure will be described.

This adjustment can be roughly divided into the following three.

Adjusting the amount of feeding required to switch the photographing optical systems 3 and 4 from the wide-angle region to the telephoto region to a predetermined value Adjusting the distance between the photographing optical systems 3 and 4 and the film surface to a predetermined value An example of a specific procedure of adjustment for adjusting the phases of 3, 4 and the cam member 53 and the like that follows this will be described below.

I. The base plate 10 and the parts such as the main optical system 3, the sub optical system 4, and the sub optical system insertion / removal mechanism attached to the base plate 10 are set as one unit and attached to a predetermined jig. The jig includes a guide member that supports the base plate 10 so as to be able to be guided in the optical axis direction of the main optical system 3 and a collimator for inspecting the focal length of the main optical system 3 alone and the combined optical systems 3 and 4. Have.

II. The main optical system 3 alone constitutes a photographing optical system in a wide-angle state, and a subject at a first predetermined distance (for example, infinity) forms an image on a surface corresponding to the film surface.
The position of the main optical system 3, that is, the base plate 10 is adjusted while using the collimator.

A predetermined amount of the base plate 10 is extended from the adjustment position of III.II., and the sub optical system 4 is inserted behind the main optical system 3 to establish a telephoto state. The base plate 10 is extended by a predetermined amount. Then, the air gap between the main optical system 3 and the sub optical system 4 is adjusted using a collimator so that a subject at a second predetermined distance (for example, infinity) forms an image on a surface corresponding to the film surface. . The sub optical system 4 is a support cylinder 4e screwed into the drive member 27.
Therefore, the sub-optical system 4 can be moved in the optical axis direction by rotating the support tube 4e, and the air space between the sub-optical system 4 and the main optical system 3 can be adjusted.

An example of a specific procedure for the adjustment of is as follows.

IV. The unit in which the adjustments of I to III have been completed is incorporated into the camera and inserted into the optical path of the collimator.

V. As shown by the solid line in FIG. 2, the main optical system 3 alone constitutes a wide-angle photographing optical system, and the spur gear 52b and the reduction gear 53a are disengaged from each other, that is, the cam member 53 and The interlocking with the photographing optical systems 3 and 4 is cut off.

VI. After roughly adjusting the base plate 10 for supplying power to the motor 12 to an approximate position, stop supplying power to the motor 12. Then, the main optical system 3 finely adjusts the position of the base plate 10 using a collimator so that a subject at a third predetermined distance (for example, 2.4 m) is imaged on the film surface. This is done by loosening the set screw 15a shown in FIGS. 2 and 10 and inserting the guide shaft 15 into the slit 15c.
This is done by fitting the tip of a driver to and rotating the guide shaft 15. As is apparent from FIG. 10, since the guide shaft 15 itself cannot move in the axial direction, it rotates relative to the gear 14, and since the motor 12 is stopped, the gear 14 also does not rotate. Therefore, the base plate 10 moves back and forth in the optical axis direction. When the adjustment is completed, the set screw 15a is fastened to fix the guide shaft 15.

An example of a specific procedure for the adjustment of is as follows.

VII. Next, the photographing optical systems 3 and 4 and the cam lever 7
Adjustment for determining the positional relationship of the cam member 53 (cam plate 71) with respect to 3 is performed. In a state where the adjustment of VI is completed, that is, a state in which the main optical system 3 forms an image of a subject at a third predetermined distance on the film surface, the spur gear 52b and the reduction gear 53a are meshed with each other to form a cam member. 53 and shooting optics 3, 4
And can be linked. The screw 71b shown in FIGS. 2, 13, and 14 is loosened so that the cam member 53 (cam plate 71) has the long hole 71.
Allow it to rotate within the range of a. And as shown in FIG. 13, an index attached to the driven end 73a of the cam lever 73,
The screw 71b is fastened by facing the indicator attached to the cam plate 71. The index of the cam plate 71 is such that when the automatic focusing device detects that there is a subject at the third predetermined distance, the driven end 73a.
Since the cam plate 71 indicates the position to be taken with respect to, when this adjustment is completed, the photographing optical systems 3 and 4 and the cam lever 73 are shown.
The position of the cam member 53 (cam plate 71) with respect to and is determined.

VIII. Next, the position of the encoder printed circuit board 62 with respect to the photographing optical systems 3 and 4 is adjusted. First screw 62
Loosen b and insert the encoder PCB 62 into the long hole 62
Allows rotation about axis 50 within a. Then, when the photographing optical systems 3 and 4 are focused on the subject at the third predetermined distance, the board 62 is positioned at a position to be taken by the encoder printed board 62, and the screw 62b is fastened. The position to be taken by the substrate 62 means that the above-mentioned photographing optical system position signal indicating that the photographing optical system is focused on the subject at the third predetermined distance is provided for each sliding contact provided on the lower surface of the substrate 62. This is the position obtained from the pattern.

When the driven end 73a of the cam lever 73 faces the wide-angle infinity point a, the closest point b, the telephoto infinity point f, and the closest point g of the cam plate 71, the photographic optical The system accurately focuses on subjects at infinity in the wide-angle state, close-up in the same state, infinity in the telephoto state, and close-up in the same state. A position signal is obtained.

Next, the AF optical system is adjusted. The predetermined subject distance on the optical axis of the main optical system 3 (for example, 2.4 m)
Place the level plate at the position, and energize the light emitting element 8c to receive the light receiving element 8d.
Incident on. Then, the eccentric pin 75c is rotated to adjust the direction of the light projecting element 8c so that the output of the light receiving element 8d is in a predetermined focus detection state.

The wide-angle area c and the telephoto area h on the cam plate 71.
Is separated by an amount corresponding to the rotation angle corresponding to the first predetermined amount of feeding, so that the entire area of the cam surface of the cam plate 71 can be adjusted only by the above adjustment.

With the above, each adjustment is completed.

Next, the operation will be described.

(1) As shown in FIG. 3, when the dustproof cover 2 is in the open position, the focal length selection member 5 is in the telephoto position, and the main optical system 3 is already in the extended position, the switches SW1 and SW2 are set.
Since both are in the ON state, the input terminal 40a of the logic circuit 40,
Both 40b are high level. The output terminals of the exclusive OR circuit 40e and the NOR circuit 40f become Low level, and the output terminal of the OR circuit 40g also becomes Low level. Logic circuit 40
The output terminals 40c and 40d of are at low level and high level, respectively.

As a result, the switches SW7a and SW7 shown in FIG.
b turns off and switches SW8a and SW8b turn on. Since the main optical system 3 is in the extended position, the switches SW3, SW4, SW5
Are in the ON, OFF, and ON states, respectively. Switch SW7a, S
Since W7b is OFF, the first path is not formed, and since switch SW4 is OFF, the second path is not formed.

In this case, the main optical system 3 is stationary at the extended position, and the sub optical system 4 is stationary at the fully inserted position where it is completely engaged with the positioning means 28 as shown in FIG. An optical system is constructed, and its focal length 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,
It is possible to shoot with the telephoto system.

The finder optical system is also in the telephoto state as shown in FIG. 15 in which the first objective lens 56 is located in front of the second objective lens 57.

In response to a photographing start operation by pressing a release button (not shown), the motor 12 receives power from the third path and rotates, causing the optical systems 3 and 4 to emit light from infinity to a close position in the telephoto area. Displace in the axial direction to adjust the focus. The base plate 10 is displaced back and forth together with the main optical system 3 and the sub optical system 4 for focus adjustment in telephoto shooting.

Shooting in the telephoto state and shooting in the wide-angle state are almost the same, and the shooting method will be described later in the wide-angle state.

As shown in FIG. 15, when the cam member 53 rotates in accordance with the rotation of the motor 12 for adjusting the focus in the telephoto range, the vertical movement rod 58e of the straight-moving holder 58 moves the vertical movement rod 58e. One inner wall of split groove 59e and finder storage
It is held between the rear end of the guide groove 1f provided in 1a, the starting tooth 53b of the cam member 53 and the starting tooth 55b of the switching drive member 55 are separated, and the driven pin 59a of the zoom lever 59 is Cam member 53
The cam groove 54 moves within the range of the first circumferential groove 54a, and
Since the driven pin 59a is prevented from coming into contact with the side wall of the first circumferential groove 54a, the finder optical system does not operate and do not switch or vibrate.

(2) When the focal length selection member 5 is switched from the telephoto state shown in FIG. 3 to the wide-angle position, the switch SW2
Is turned off, and the input terminal 40 of the logic circuit 40 in FIG.
b becomes Low level. Exclusive or circuit 40e
The output terminal of the OR circuit 40g is inverted to the High level, and the output terminal of the logic circuit 40
c and 40d are inverted to High and Low levels, respectively.

Thus, the switches SW7a and SW7 shown in FIG.
b turns on and switches SW8a, SW8b, turn off. 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, and the switches SW7a and SW7b are
Since it is ON, the first path is formed and the motor 12 is started. 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. 8) in which the positioning means 28 is engaged by the initial rotation of the motor 12, and the incomplete insertion which does not engage this. Displace to position. This displacement in the optical axis direction is caused by the cam 26a.
Is rotated counterclockwise from the state shown in FIG. 12 to push up the sliding contact portion 27c of the drive member 27 in the first slope section B.

Before the cam 26a pushes up the sliding contact portion 27c of the driving member 27 in the first slope section B, the engaging portion 27e of the driving member 27 is pushed.
Comes into contact with the first engaging portion 30c from a position facing the first small diameter portion 30b of the blocking plate 30a. Then, before the sub optical system 4 reaches the incompletely inserted position, the engaging portion 27e is
The engagement with the engagement portion 30c is released to reach a state of facing the second small diameter portion 30d. FIG. 12 shows the state immediately before that.

When the sub optical system 4 reaches the incompletely inserted position and disengages from the positioning means 28 and the engaging portion 27e faces the small diameter portion 30d, the driving member 27 can swing in the direction transverse to the optical axis. Therefore, with the subsequent rotation of the motor 12, the sliding contact portion 27c is pushed by the first slope section B and swings counterclockwise in the plane crossing the optical axis of the main optical system 3.

In this case, the base plate in which the end surface of the small cylinder 4c of the sub optical system 4 is perpendicular to the optical axis of the main optical system 3 as shown in FIGS.
Swing in the same direction while sliding on the backside 10m of 10. When the main optical system 3 approaches the retracted position, the free end 27d of the drive member 27
Comes into contact with the locking member 10k and is prevented from swinging, and the sub optical system 4 reaches an incomplete retracted position where it is not inserted into the circular hole 10l.

Since the motor 12 continues to rotate after that,
The sliding contact portion 27c of the drive member 27 is formed on the first slope section B of the cam 26a.
To reach the second flat section C. Stop plate at this time
The second engaging portion 30c of 30a abuts on the engaging portion 27e of the drive member 27.

Subsequently, the sliding contact portion 27c slides down the second slope section D. At this time, the action of the spring 30 may cause the sliding contact portion 27c to slide down along the second slope section D and rotate in the clockwise direction to move the sub optical system 4 back toward the insertion position. The movement is blocked by the engagement between the second engagement portion 30e and the engagement portion 27e.

As the sliding contact portion 27c slides down along the second slope section D, the front end surface of the bearing portion 27a abuts the collar 10i as shown in FIG. 9, so that the sliding contact portion 27c moves from the cam 26a. It separates and faces the first flat section A, but reaches a state where it does not contact.

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 is the edge of the circular hole 10l. To reach the fully retracted position. At this time, the main optical system 3 has reached the retraction position. At this time, the engagement portion 27e is connected to the second engagement portion 30.
It is disengaged from e and faces the first small diameter portion 30b.

After the front end surface of the bearing portion 27a contacts the flange 10i, the driving member 27 stops its displacement in the optical axis direction, and then the urging force for inserting the sub optical system 4 into the circular hole 10l is the spring 29. Supplied by.

When the main optical system 3 reaches the retracted position, FIG.
Switches SW3, SW4, SW5 shown in 9 are OFF, ON, ON respectively
It becomes the state of. When the switch SW3 is turned off, the above first
Is cut off, and 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. Further, since the switches SW1 and SW5 are both ON, the automatic focus adjustment / shutter control circuit 31 is in an operable state, and it becomes possible to shoot in a wide-angle region.

Further, the finder optical system is switched by the finder switching mechanism in the following manner in response to the change of the above state. That is, the first finder optical system 6 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 51b, the pinion 52a, the transmission shaft 52, the spur gear 52b, and the reduction gear 53a make a cam by the path. The member 53 is largely rotated.

By the rotation of the cam member 53, the starting tooth 53b pushes the starting tooth 55b of the fan-shaped portion 55d of the switching driving member 55, and the driving tooth 53c and the driving tooth 55c mesh with each other. Since one tooth is missing between the driving tooth 55b and the driving tooth 55b, the meshing can be smoothly started without interference.

Then, as shown in FIG. 16, the switching drive member
Since 55 is rotated, the engagement rod 57c is attached to the first cam surface 55e.
Is pushed, the second objective lens 57 rotates counterclockwise about the swing shaft 57a by a set angle, and the engaging rod
When the tip of 57c reaches the second cam surface 55f, the second objective lens
57 is held at a constant angle.

Synchronizing with the angular displacement of the second objective lens 57,
The first objective lens 56, together with the switching drive member 55, is a cam portion 55g.
An arc is drawn centering on, and the second objective lens 57 is moved by grabbing the end when the second objective lens 57 faces the front.

At this time, the second objective lens 57 is housed in a substantially trapezoidal space formed adjacent to the constricted part of the finder optical system.

After that, the driven pin 59a of the variable power rocking lever 59 reaches the area of the drive groove 54b from the first circumferential groove 54a of the cam groove 54. Then, the variable power swing lever 59 pivots clockwise about the pivot 59b, which causes the split groove 59e and the driven rod.
The linear holder 58 is pushed forward via the linear movement connecting arm 58d.

When the straight holder 58 is pushed forward, the tip of the engaging 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. The straight holder 58 and the second objective lens 57 are pushed to the original position of the first objective lens 56 instead of the first objective lens 56 without interfering with the 55g, and the variable magnification swing lever is moved.
59 is inverted and held in the wide-angle position by the toggle spring 59d.
The state becomes as shown in (1) and the viewfinder optical system for wide angle is used.

Simultaneously with the switching of the respective systems, the AF system and the display within the finder are switched.

That is, as shown in FIG. 18, in the telephoto state, the driven end 73a of the cam lever 73 is in the telephoto area h of the cam surface of the cam plate 71, but when the cam member 53 rotates, the driven end 73a is moved to the telephoto area. After passing through the telephoto infinity point f which is the focusing operation start position in h, reaches the transition area d through the standby area e which is the circumferential surface, enters the wide angle area c and switches to the wide angle state, and finally, As shown in FIG. 17, the driven end 73a has a wide-angle infinity point a which is a focusing operation start position in the wide-angle region c.
Located in.

As a result, the light projecting direction of the light projecting element 8c is in the infinity direction substantially parallel to the optical axis of the main optical system 3.

Further, when the base plate 10 is retracted at the time of switching from the telephoto to the wide angle, the linear cam plate 17 is also integrally retracted to the state shown in FIG. 2, and the driven pin 82a engaged with the cam groove 17b is displaced. Then, the pointer 83e, which was visible in the viewfinder in the telephoto state, leaves the field of view, and the pointer 83d comes into the field of view.

The motor 12 is rotated by receiving power from the third path in response to the photographing start operation by the release button (not shown).
The main optical system 3 is extended from the infinity position in the wide-angle region shown in FIG.

As the motor 12 rotates, the gear 14 rotates via the gear 13, and the gear 14 cannot move back and forth with respect to the base plate 10. Therefore, the gear 14 moves along the guide shaft 15 together with the base plate 10.

The movement of the base plate 10 is transmitted to the pinion 52a via the rack teeth 51b of the rack 51, and is transmitted from the transmission shaft 52 to the spur gear 52.
b, converted into rotational motion and transmitted to the cam member 53 via the reduction gear 53a.

The gear 50b biased by the spring 50c is a reduction gear.
Since it is meshed with 53a, backlash during meshing is suppressed and it is transmitted accurately.

When the reduction gear 53a rotates, the cam member 53 also integrally rotates, the driven end 73a follows the cam surface of the cam plate 71, and the cam lever 73 is rotationally displaced according to the photographing distance. Since the wide-angle shooting is performed, the driven end 73a moves from the infinite point a of the wide-angle area c toward the closest point b. In the case of telephoto shooting, the camera moves from the infinity point f in the telephoto area h to the closest point g.

The displacement of the cam lever 73 appears as the tilt of the light projecting element 8c, and the light beam from the light projecting element 8c is swung from infinity to the close direction. When this ray hits the subject,
There, it is reflected and returns to the light receiving element 8d. When the change in the output state of the light receiving element 8d at this time is calculated by the distance measuring device and the focus detection output assumed in advance is reached, the motor 12
Stops. At this time, the photographing optical system (main optical system 3) is focused on the subject. When the focusing is completed, the projection of the projection element 8c is also stopped, and shooting is continued.

Since there is inertia in the cam member 53 and others, and there is a deviation between the signal and the stop distance, the cam surface of the cam plate 71 is set in advance in consideration of it.

When the base plate 10 moves back and forth, the linear cam plate 17
The slide lever 83 is moved laterally via the driven pin 82a by the cam groove 17b, and the pointer 83d moves within the field of view of the viewfinder. You can know. For telephoto shooting, the pointer 83e functions similarly.

When the release button is released, the motor 12 reversely rotates,
The main optical system 3 is moved up to the infinity position in the wide-angle range, and the driven end 73a of the cam lever 73 faces the infinity point a to prepare for the next photographing. The position is detected by switches SW3, SW4 and SW5.

Motor for focus adjustment in wide-angle range
During the rotation of 12, the sliding contact portion 27c of the drive member 27 only faces the first flat section A and does not make contact therewith, so that the drive member 27 does not move and the sub optical system 4 remains in the completely retracted position. .

Even when the cam member 53 is rotated for focus adjustment in the wide-angle state, the urging force of the vertical rod 58e of the rectilinear holder 58 causes the inner wall of the split groove 59e of the zoom lever 59 and the finder storage portion. It is held by being held between the front end of a guide groove 1f provided in 1a.

The driven pin 59a of the variable power swing lever 59 moves within the range of the second circumferential groove 54c of the cam groove 54 of the cam member 53, and the driven pin 59a of the side wall of the second circumferential groove 54c moves. Since the driven pin 59a moves within the area of the second circumferential groove 54c of the cam groove 54, the variable-magnification rocking lever 59 does not rock and the fan-shaped portion of the switching drive member 55 does not contact. 55d drive teeth
Since the end of 55c is in sliding contact with the sliding edge 53d of the cam member 53, the second objective lens 57 is not displaced and is stably held.

(3) When the dust cover 2 is displaced from the open position to the closed position in the telephoto state, the switch SW1 is turned off.
Then, the input terminal 40a of the logic circuit 40 becomes low level, and the output terminal of the exclusive OR circuit 40e becomes high level. The following operation is the same as that of (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 2 can be displaced to the closed position. When the dustproof cover 2 reaches the closed position, the switch SW1a having the same phase as the switch SW1 is turned off, so that the power supply to the automatic focus adjustment / shutter control circuit 31 is cut off and the photographing is impossible.

Similarly, in the finder optical system, the AF system, etc., the telephoto position is switched to the wide-angle position.

(4) When the dustproof cover 2 is displaced from the wide-angle state to the closed position, the switch SW1a in phase with the switch SW1
Is turned off, power supply to the automatic focus adjustment / shutter control circuit 31 is cut off, and shooting is impossible.

(5) When the focal length selecting member 5 is switched from the wide-angle state shown in FIG. 4 to the telephoto position, the switch SW2 is turned on.
Then, the input terminal 40a of the logic circuit 40 shown in FIG.
Both 40b are high level. Since the output terminals of the exclusive OR circuit 40e and the NOR circuit 40f both become Low level, the output terminal of the OR circuit 40g is inverted to Low level,
The output terminals 40c and 40d of the logic circuit 40 are inverted to Low and High levels, respectively.

Thus, the switches SW7a and SW shown in FIG.
7b is turned off and switches SW8a and SW8b are turned on. Since main optical system 3 is in the retracted position, switches SW3, SW4, SW5
Are in the OFF, ON, and ON states, respectively. Switch SW8a, S
Since W8b is ON and switch SW4 is ON, the above second
The path is formed, and the motor 12 starts to rotate in the direction opposite to that in the case of (2). Therefore, the main optical system 3 starts to be displaced from the retracted position toward the extended position.

By the initial rotation of this motor 12, the sub optical system 4
Is displaced from the complete retracted position shown in FIG. 9 in the optical axis direction, comes out of the circular hole 101, and is displaced to the incomplete retracted position. The displacement in the optical axis direction is caused by the rotation of the cam 26a and the pushing up of the sliding contact portion 27c of the drive member 27 in the second slope section D.

Before the cam 26a pushes up the sliding contact portion 27c of the driving member 27 in the second slope section D, the engaging portion 27e of the driving member 27 is pushed.
Comes into contact with the second engaging portion 30e from a position facing the first small diameter portion 30b of the blocking plate 30a. Then, before the sub optical system 4 reaches the incomplete retracted position, the engagement portion 27e releases the engagement with the second engagement portion 30e and reaches the state of facing the second small diameter portion 30d. FIG. 11 shows the state immediately before this.

After that, when the sub optical system 4 reaches the incomplete retracted position and comes out of the circular hole 101, the driving member 27 can swing in the direction crossing the optical axis of the main optical system 3.

As the motor 12 continues to rotate, the sliding contact portion 27c
Since it is pushed in the direction crossing the optical axis by the second slope section D, the driving member 27 swings in the same direction, and the small tube 4c of the sub optical system 4 is moved.
While the end surface of is sliding on the back surface 10m of the base plate 10, it moves from the incomplete retracted position to the incomplete inserted position.

When the main optical system 3 approaches the extended position, the free end 27d of the driving member 27 contacts the locking member 10j, its swing is prevented, and the sub optical system 4 stops at the incompletely inserted position. Since the motor 12 continues to rotate after that, the sliding contact portion 27c of the drive member 27 climbs up the second slope section D of the cam 26a and reaches the second flat section C. At this time, the first engaging portion 30c of the blocking plate 30a engages with the engaging portion 27e of the driving member 27.

Subsequently, the sliding contact portion 27c slides down the first slope section B as shown in FIG. At this time, due to the action of the spring 30, the drive member 27 may rotate counterclockwise along the first slope section B, and the sub optical system 4 may move back toward the retracted position. It is blocked by engaging the first engaging portion 30c.

While the sliding contact portion 27c slides down the second slope section D, the front end surface of the bearing portion 27a contacts the collar 10i,
The sliding contact portion 27c separates from the cam 26a and comes into a state of facing the first flat section A but 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 is positioned by the positioning means.
After contacting the guide surface 28b of 28, the guide surface is guided by the guide surface 28b.
28a, 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. 8, and the positioning is completed in the sub optical system 4. At this time, the main optical system 3
Has reached the feeding position. At this time, the engagement section 27
e is released from the engagement with the first engagement portion 30c, and the first small-diameter portion
Opposite 30b.

After the bearing member 27a comes into contact with the collar 10i to stop the displacement of the drive member 27 in the optical axis direction, the urging force for engaging the sub optical system 4 with the positioning means 28 is the spring.
Supplied by 29.

When the main optical system 3 reaches the delivery position,
As described in (1), the switches SW3, SW4, and SW5 are in the ON, OFF, and ON states, respectively. When the switch SW4 is turned off, the second path is cut off and the power supply to the motor 12 is stopped. Therefore, as shown in FIG. 2, the main optical system 3 is stationary in the extended position, and the sub optical system 4 is stationary in the fully inserted position.
A synthetic optical system is constructed, and its focal length is in the telephoto range. Further, since the switches SW1a and Sw5 are both ON, the automatic focus adjustment / shutter control circuit 31 is in an operable state, and photographing 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 advances, so that the cam member 53 rotates largely, contrary to the above.

As a result, the driven pin 59 of the zoom lever 59 is changed.
a goes from the second circumferential groove 54c of the cam groove 54 to the drive groove 54b,
From the state shown in FIG. 14 and FIG.
59 rotates counterclockwise to pull back the second objective lens 57 and the rectilinear holder 58 backward. When the second objective lens 57 and the rectilinear holder 58 retreat, the tip 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. It is held at an angle.

In synchronization with this, the driving tooth 53c is replaced by the driving tooth 55c.
, The switching drive member 55 is rotated clockwise, and the housed first objective lens 56 is rotated clockwise around an oscillating shaft 55a in an arc.

Next, the tip portion of the engaging rod 57c has a cam portion 55g.
15, the second objective lens 57 faces the front, and the rectilinear holder 58 returns to the front front of the second objective lens 57 to reach the telephoto state shown in FIG.

Similarly, the distance display in the viewfinder is the same as the above (2).
By the operation opposite to the above, the wide-angle state is switched to the telephoto state.

(6) When the dustproof cover 2 is displaced toward the open position from the state in which the dustproof cover 2 is covered in the telephoto state,
The switch SW1 is turned on and the input terminal of the logic circuit 40
Both 40a and 40b are at high level. The following is the same as the operation described in (5) above.

The photographing and optical system switching operations will be described in detail with reference to FIG.

(A) The operation at the time of photographing is as follows.

The photographing operation is the same for both the wide-angle area W and the telephoto area T.

The signal from the decoder 204 indicates the amount of extension of the photographic optical system, that is, the object distance, and is input to the aperture control circuit 225 for flashmatic control when using the flash, and the photographic conditions corresponding to each step are set. It The photographing is extended from step 8 in the encoder to measure the distance.

As a distance measurement start switch, a hand push switch
When 226 is turned on, one side input of the NAND gate 229, which is normally at H level by the resistor 227, becomes L. NA
Since the ND gate 228 and the NAND gate 229 form an RS flip-flop, the NAND gate 229
The output of the NAND gate 229 becomes H level when one input of the signal becomes L, and this signal is given to the AND gate 230. If the other input of the AND gate 230 is H, the output of the AND gate 230 becomes H, and the output of the NOR gate 231 controlled by the output is L and the output of the OR gate 234 is H.
Then, the PNP transistor 235 is turned on, the NPN transistor 238 is also turned on, a current path of the PNP transistor 235, the drive motor 12, and the NPN transistor 238 is formed in the drive motor 12, and the drive motor 12 rotates. The rotation direction at this time is defined as normal rotation.

The photographic optical system is driven by the rotation of the drive motor 12, and at the same time, the projection LED 243 is tilted by the above mechanism to perform scanning. Focus detection circuit 240 is a light receiving element 241
Depending on the output state of H, H is output at the time of focusing.

This H signal is transferred to the O level via the inverter 245.
If the other inputs of the OR gate 244 are all L, the output from the focus detection circuit 240 causes O
The R gate 244 outputs the L signal, which is the NAND gate
It is input to 228 and the output of the NAND gate 229 is reset to L. Therefore, the output of the AND gate 230 also becomes L, and the NOR gate that has been driving the drive motor 12 until then.
Since the output of 231 is H and the output of the OR gate 234 is L, the PNP transistor 235 and NPN transistor 238 are turned off, the drive motor 12 is stopped, and an image is taken.

When the photographing is completed, the photographing optical system is reset to the photographing start position.

When the photographing optical system reset switch 249 is turned on, the output of the NAND gate 252 whose one side input is fixed to the H level by the resistor 250 is set to the H level. NAND gate 251 and NAND gate 252 are R
Since the -S flip-flop is configured, the NAND gate 252 is held in that state.

When NAND gate 252 is set high, NOR gate 233 and OR connected to it.
The gate 232 outputs L and H respectively, the PNP transistor 236 and the NPN transistor 237 are turned on, and the PNP
Transistor 236, drive motor 12, NPN transistor 23
A current path is formed by 7 and the drive motor 12 rotates in the reverse direction. This reverse rotation is an operation in which the photographing optical system is moved to a step 8 from a position other than the step 8.

When the photographing optical system is retracted by the reverse rotation of the drive motor 12 and step 8 is entered, AND of the decoder 204 is performed.
The gate 212 outputs H to the terminal 212a, so that the one-sided input of the NAND gate 251 via the inverter 253 becomes L.
As a result, the output of the NAND gate 252 is reset to L, the NOR gate 233 and the OR gate 232 output L, the PNP transistor 236 and the NPN transistor 237 are turned off, and the drive motor 12 is stopped.

The above is the operation from the start of photographing to the reset for the next photographing.

Until focusing, the output of the focus detection circuit 240 is input to the OR gate 244 via the inverter 245, but the outputs of the terminals 211a and 212a of the decoder 204 are connected to the OR gate 244. , And these become H in step 7 and step 8, respectively.

When the manual switch 226 is turned on as described above in the focus detection start state, the drive motor 12 is driven in the normal rotation direction, but at the same time, the brush slides on the encoder pattern shown in FIG. In the case, the starting point is step 8
Is. Therefore, the output is always H in the position range of step 8 and step 7, and even if the focus detection signal from the focus detection circuit 240 is input, that signal is ignored. This is effective because in the focus detection operation, even if the focus detection circuit 240 issues an erroneous signal due to fluctuations in the power supply that occur when the drive motor 12 is started, it is effective.

If the subject is at infinity, the focus detection circuit 240 outputs the H signal from the beginning, and the outputs of the terminals 211a and 212a of the decoder 204 are H, In steps 7 and 8, NAND gate 229
Output is not reset, go to step 6 and enter terminal 211
When both outputs of a and terminal 212a become L, drive motor 12
Stops. This position is set as an infinite distance. The infinity distance may be set as a hyperfocal distance if the depth of field of the optical system is taken into consideration.

When the focus detection circuit 240 does not output the focus detection signal, that is, when the subject distance is too short, the NAND gate 229 is not reset and the drive motor 12 continues to rotate normally. However, in this case, the operation is controlled by the NOR gate 246 input to one side of the AND gate 230. That is, the NOR gate 246 detects that the output of the output terminal 205a of the decoder 204 is H, that is, step 1, or the output of the terminal 206a of the decoder 204 when the telephoto detection switch 258 is on is H, that is, step 2, An output is generated, forcing the output of AND gate 230 to L. This is nothing but the restriction on the extension position of the photographing optical system. In the present embodiment, the position is limited in step 1 in the wide-angle region, and the position is limited in step 2 in the telephoto region.

The output of the NOR gate 246 causes A
When controlling the output of the ND gate 230, the NAND gate
Although 229 remains unreset, the reset at this time can be performed by inputting L to the reset terminal 244a.

The determination step as the reset position, the masking step for preventing an erroneous signal at the time of starting at the time of extension, and the step of the hyperfocal stop position at the AF signal are the same step in the wide angle range and the telephoto range, respectively. Has been set as. This can be set to different steps in each range, but there is an advantage that a common control circuit can be used by setting common steps.

(B) The operation when switching the photographing optical system is as follows.

Assuming that the wide-angle region is switched to the telephoto region, when the optical system switching instruction switch 254 is turned on for switching, the NAND fixed to H by the resistor 255 is used.
One side input of the gate 256 becomes L, and the output of the NAND gate 256 is set to H and held in the NAND gate 256 and the NAND gate 257 which form the RS flip-flop. At this time, D-flip-flop 259
The clock input of H becomes H at the output of the NAND gate 256, and the state of the telephoto detection switch 258 connected to the D input of the D-flip-flop 259 is read and output via the terminal 258a. The telephoto detection switch 258 corresponds to the output from the pattern 63e on the encoder, and is set to be turned on in the telephoto area T in this embodiment.

Therefore, when the optical system switching instruction switch 254 is turned on in the wide-angle region W, the telephoto detection switch 258
Is off, the output of D-flip-flop 259 is H
Becomes The H signal causes the output of the AND gate 263 to go to H, the NOR gate 231 to L and the OR gate 234 to H.
Then, as described above, the drive motor 12 rotates in the normal direction. The switches 201, 202, 203 output steps 8 to 1 by the normal rotation of the drive motor 12, but step 8 is performed in the telephoto area T beyond the moving area N, and the output of the terminal 212a of the decoder 204 is output as H. As a result, one side input of the NAND gate 257 becomes L through the NAND gate 261, the output of the NAND gate 256 is reset to L, and the drive motor 12 stops.

Here, the NAND gate 261 is controlled by the delay circuit 260, which means that after a certain time delay is set from the start of the normal rotation of the drive motor 12, the terminal 21
Since the information of 2a is transmitted to the NAND gate 257, when the drive motor 12 is started when switching from the telephoto area T to the wide-angle area W, it is located in step 8 and the NAN
Prevents D-gate 256 from being reset in-situ.

When switching from the telephoto area T to the wide-angle area W, when the optical system switching instruction switch 254 is turned on, the telephoto detection switch 258 is turned on and the output of the D-flip-flop 259 becomes L. Therefore, the AND gate
The output of 263 becomes L, and the output of the AND gate 263 becomes H via the inverter 262, which causes the drive motor 12
Is driven in reverse. Stopping is the same as in the case of normal rotation, and thus description thereof is omitted.

According to this embodiment, since the cam surfaces of the wide-angle area a, the transition area d, the standby area e, and the telephoto area h are formed integrally with the cam plate 71 made of synthetic resin, manufacturing and assembling are performed. Will be easier.

Further, since the relative positions of the cam plate 71 and the photographing optical system can be adjusted by the adjusting mechanisms 71a and 71b, high focus adjustment accuracy can be obtained.

Since the wide-angle area a and the telephoto area h of the cam plate 71 are integrally formed, the relative positions of the two areas cannot be changed. Therefore, the back optical adjustment of the telephoto area h is performed by the main optical system 3 and the sub-optical system 4. This can be done by adjusting the air gap between the and.

In the above embodiment, the photographing optical system is extended from the position where the subject at infinity is focused to the position where the closest subject is focused at the time of automatic focus adjustment prior to photographing. The present invention is not limited to this, but can be applied to a configuration in which the components are retracted in the opposite direction.

In the above embodiment, the focal lengths of the photographing optical system that can be switched are two types, wide angle and telephoto, but the present invention is not limited to this, and is applicable to a configuration that can be switched to three or more types. It is possible.

[0221]

Since the switching drive from the first optical state to the second optical state and the switching drive from the second optical state to the first optical state can be activated by a single switch operation,
The configuration is simple because there is no need to provide an individual switch. Also, the cost can be reduced. Further, since the current optical state is detected and switched to the other optical state, the optical state can be surely switched by the switch operation.

[Brief description of drawings]

FIG. 1 is a pattern layout diagram showing an encoder detection area according to an embodiment of the present invention.

FIG. 2 is a perspective view schematically showing the internal mechanism of the camera according to the embodiment of the present invention.

FIG. 3 is a plan view showing an embodiment of the present invention with a part of the camera cut away.

FIG. 4 is a plan view of a camera according to the embodiment of the present invention.

FIG. 5 is a plan view of the camera according to the embodiment of the present invention.

FIG. 6 is a vertical sectional view of the camera according to the embodiment of the present invention.

FIG. 7 is a horizontal sectional view of a camera according to the embodiment of the present invention.

FIG. 8 is a detailed cross-sectional view of a main part of the sub optical system insertion / removal mechanism according to the embodiment of the present invention.

FIG. 9 is a detailed cross-sectional view of a main part of the sub optical system insertion / removal mechanism according to the embodiment of the present invention.

FIG. 10 is a schematic sectional view of an essential part of a sub optical system insertion / removal mechanism according to an embodiment of the present invention.

FIG. 11 is a front view of a blocking mechanism that is linked to a sub-optical system insertion / removal mechanism according to an embodiment of the present invention.

FIG. 12 is a front view of a blocking mechanism that interlocks with a sub optical system insertion / removal mechanism according to an embodiment of the present invention.

FIG. 13 is a plan view of the automatic focusing mechanism according to the embodiment of the present invention.

FIG. 14 is a vertical sectional view of the automatic focusing mechanism according to the embodiment of the present invention.

FIG. 15 is a plan view of the finder optical system switching mechanism according to the embodiment of the present invention.

FIG. 16 is a plan view of the finder optical system switching mechanism according to the embodiment of the present invention.

FIG. 17 is a plan view showing the vicinity of the cam plate according to the embodiment of the present invention.

FIG. 18 is a plan view showing the vicinity of the cam plate according to the embodiment of the present invention.

FIG. 19 is a diagram showing an optical system driving motor control circuit according to an embodiment of the present invention.

FIG. 20 is a logic circuit diagram for controlling the operation of the motor control circuit according to the embodiment of the present invention.

FIG. 21 is a cam diagram showing an example of the present invention.

FIG. 22 is a diagram showing the relationship between the diameter of the circle of confusion and the depth of field, showing an embodiment of the present invention.

FIG. 23 is a detailed control circuit diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 ... Camera body 1a ... Finder housing 3 ... Main optical system 4 ... Sub optical system 10 ... Base plate 12 ... Motor 26 ... Cam gear 27 ... Drive member 51 ... Rack 53 ... Cam member 55 ... Switching drive member 56 ... First objective Lens 57 ... Second objective lens 61 ... Detection brush plate 62 ... Encoder printed circuit board 71 ... Cam plate 73 ... Cam lever

Claims (1)

(57) [Claims] 1. A first position that forms a first optical state in which an image can be taken, and a second position that forms a second optical state different from the first optical state.
A photographing optical system that is displaceable between a position and a position; a driving device that drives the photographing optical system between the first position and the second position; and whether the photographing optical system is at the first position. A detection device for detecting and outputting whether or not it is in the second position, a switch that is operated to switch the optical state of the photographing optical system, and returns to a non-operation state when the operation is released; Whenever the photographic optical system is in the first position, the drive device is activated so as to be driven to the second position when the photographic optical system is in the first position and to the first position when the photographic optical system is in the second position. A camera having a control circuit.