JPS61236536A - Focal length changeover type camera - Google Patents

Abstract

PURPOSE:To control the position of an optical system correctly and accurately by providing an electric detecting means which is associated operatively with the quantity of movement of a photographic optical system capable of reciprocating in a movement area between the 1st ad the 2nd focal-length areas. CONSTITUTION:Five kinds of concentric patterns 63(63a-63e) for sliding are provided to a printed board 62 arranged above a cam plate which is associated with an AF device and the photographic optical system, and its periphery is divided into the wide-angle area W, movement area N, and telephoto area T of the optical system. Respective brushes are brought into contact with the respective patterns 63 to lead out the position signal of the optical system. A focal length selection member F is placed at a telephoto position T and a telephoto state is entered by placing a main optical system 3 at an extension position and a subordinate optical system 4 at an insertion position; and a wide-angle state is entered by setting the main optical system 3 at an contraction position and the subordinate optical system 4 at a standby position. Therefore, electric position detection is performed on the basis of the quantity of movement of the optical system and position control is carried out accurately and securely over the entire area by the simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD OF THE INVENTION The present invention relates to a focal length switching type camera in which a photographing optical system is switchable between at least a first and a second focal length.

"Background of the Invention" As a conventional example of a camera with a switchable focal length, the photographing optical system is composed of both a main optical system and a sub-optical system, and the main optical system is displaced in the optical axis direction, and the sub-optical system is used to control the photographing light beam. It is known that the focal length of the photographic optical system can be switched between wide-angle and telephoto by inserting and removing the lens. The main optical system is capable of reciprocating through three areas: wide-angle, focal length switching, and telephoto, which are narrowed by the first, second, third, and fourth points arranged from the film surface side toward the subject side. In the wide-angle region, the photographing optical system is composed of only the main optical system, and exhibits a wide-angle focal length. When the main optical system is extended from the first point to the second point in the wide-angle region, the distance of the object to be focused changes from, for example, infinity to close range. When the main optical system is extended to move the focal length switching area from the second point to the third point, the sub optical system is inserted into the photographing light beam, and both the main and sub optical systems constitute the photographic optical system, and the focus The distance is changed from wide-angle to telephoto. When the main optical system is extended from the third point to the fourth point in the telephoto region, the distance of the subject to be focused changes from infinity to close.

When considering the case where an automatic focus adjustment device is employed in a focal length switching type camera as described above, it is necessary to accurately detect and control the positional information of the photographing optical system in different areas.

2. Description of the Related Art Conventionally, as a camera having a lens barrel that can be switched to a plurality of moving ranges, a camera has been proposed that is provided with a mechanical stopper that regulates each shooting range.

However, such cameras have problems in terms of cost, accuracy, and space due to the complicated stopper mechanism and poor positioning accuracy.
As disclosed in Publication No. 192QOE1, there is a lens barrel with a double structure, and a movement range for switching the shooting range and a movement range for automatic focus adjustment are separate.

However, when the lens barrel has a double structure, it becomes difficult to accurately determine their positions, and the structure becomes extremely complicated and large.

``Object of the Invention'' The present invention has been made by focusing on the above-mentioned conventional problems. It is an object of the present invention to provide a focal length switching type camera that solves the above-mentioned problems.

"Summary of the Invention" The gist of the present invention for achieving the above object is to provide a focal length switchable camera in which the photographing optical system is switchable between at least a first and a second focal length. are the first, second, and third arrays arranged at intervals in the optical axis direction.
, the first movement range narrowed by the fourth points
It is supported so as to be able to reciprocate in each region of the focal length region, the transition region for focal length switching which is the second movement range, and the second focal length region which is the third movement range.

The @l focal length region is moved forward from the first point to the second point to perform focus adjustment while exhibiting the first focal length, and the focal length switching region is moved from the second point to the second point. The focal length is switched from the first to the second focal length by moving forward toward the three points, and the third focal length is
moving back from the point to the second point to switch from the second to the first focal length, and moving the second focal length region back from the third point to the fourth point to switch the focal length from the second point to the fourth point. An electric drive means is provided for driving the photographing optical system so as to perform focus adjustment while exhibiting two focal lengths, an electric detecting means is provided which moves synchronously in accordance with the amount of movement of the photographing optical system, and the electric detecting means is , the first of the photographing optical system
- A focal length switching type camera characterized in that the electric detection means is provided with first to third detection areas whose positions can be continuously detected corresponding to a third movement range.

Therefore, since an electric detection means that can continuously and integrally correspond to the first to third movement ranges of the photographing optical system is provided, and the entire area is controlled by the electric detection means, the system is compact and simple. The mechanism allows accurate positioning control over the entire area.

"Example" Hereinafter, one embodiment of the present invention will be described based on the drawings.

As shown in FIGS. 3 to 7, a dustproof cover 2 is placed on the front side of the camera body 1 in the left-right direction in FIGS. It is provided so that it can be displaced in the direction (vertical direction in FIGS. 3 to 5), that is, it can be extended and retracted. Inside the camera body 1, there is a sub optical system 4 which together with the main optical system 3 constitutes a photographing optical system.
It can be displaced in the direction across the optical axis of the main optical system 3 (in the left-right direction in Figures 3 to 5) between the position where it is inserted into the light beam of the main optical system 3, that is, the photographing light beam, and the position where it is withdrawn from the light beam. It is provided.

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

In FIG. 3, the dust 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 in a telephoto range, and is opposed to the letter "T" attached to the top surface of the camera body 1. The main optical system 3 is located at an extended position protruding from the front surface of the dustproof cover 2, and constitutes a composite optical system with the sub optical system 4 located at the inserted position to have a focal length in the telephoto range.

In FIG. 4, the dust 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 in a wide-angle range, and faces the letters r W J attached to the top surface of the camera body 1 . At this time, main optical system 3
is in the retracted position, retracted into the camera body 1 from the extended position, and the sub-optical system 4 is in the retracted position. Main optical system 3
is the focal length of the wide-angle area.

In FIG. 5, the dust cover 2 is in the closed position and covers the main optical system 3. In FIG. 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, the indicator 2a attached to the top surface of the dustproof cover 2 is attached to the top surface of the camera body l in order to make it visible from the top of the camera that photography is not possible. It is opposite to the letters roFFJ.

As can be seen in FIG. 3, a switch SWI interlocked with the dustproof cover 2 and a switch SWI interlocked with the focal length selection member 5 are provided within the camera body 1.

The switch SWI consists of a sliding piece 2b fixed to the dustproof cover 2 and a conductive land 2C fixed to the camera body 1, and is turned ON when the dustproof cover 2 is in the open position, and is turned on from the open position to the closed position. When it is displaced, it turns OFF. This switch SWI is connected to a motor 1, which will be described later, which displaces the main optical system 3.
2, and also controls power supply to a shutter control circuit 31, which will be described later.

The switch SW2 includes a sliding piece 5a fixed to the focal length selection member 5 and a conductor land 5b fixed to the camera body l.
It switches according to the position of the focal length selection member 5, and controls the rotational direction of a motor 12, which will be described later, which displaces the main optical system 3. The switch SW2 is a focal length selection member 5
ON when the camera is in the telephoto position, and O when the camera is in the wide-angle position.
Becomes FF.

In the upper part of the camera body 1, a reverse Galilean type finder optical system including a first finder optical system 6 having a positive refractive power and a second finder optical system 7 having a negative refractive power is housed in a finder housing 1a. It is provided.

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

Also, on both sides of the finder optical system are AF (automatic focusing) optical systems 8a and 8b.
A light projecting element 8C is provided after the AF optical system 8b, and a light receiving element 8d is provided after the AF optical system 8b.

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 flux passes is provided in the center of the base plate 10, and a main optical system 3 is mounted in the front part of the aperture 10a.
After that, an aperture/shutter device 11 shown in phantom lines is attached. From the aperture/shutter device 11 is an FPC (flexible printed circuit board) FP for control signal transmission.
Clla is extended.

A motor 12 is fixedly installed on the upper back surface of the base plate 10.
A bevel gear 12a is fixed to one end of the rotating shaft. A gear 13 pivotally supported by the base plate 10 meshes with this bevel gear 12a, and a gear 14 meshes with a spur gear integral with this gear 13. The gear 14 is held by a holding arm erected on the base plate 10 so that it can rotate but cannot move in the axial direction.

A through hole is formed in the center of the gear 14, and a female thread is cut in the through hole with the rotation center of the gear 14 as the axis. A male thread cut on the guide shaft 15 is screwed into this female thread.

The guide shaft 15 extends in the optical axis direction, and the guide shaft 15 extends in the optical axis direction.
As can be seen, the end is inserted into the circuit board IC of the camera body l and fixed unrotatably with a set screw 15a, and the tip end is inserted into the through hole 10b of the base plate 10 (shown in Figure 1O) in the axial direction. It is slidably inserted, and the leading end is fitted into the camera body l.

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

Further, a base of a linear motion cam plate 17 is fixed to the base plate 10 so as to be along the moving direction of the base plate 10 (optical axis direction of the main optical system 3), and the linear motion cam plate 17 has a spring property. A sliding contact portion 17a is formed at the tip thereof, and 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 IO. There is.

With this configuration, when the motor 12 rotates, the plywood lO moves in parallel in the optical axis direction due to the screw engagement between the gear 14 and the guide shaft 15, and the main optical system 3 and the diaphragm/shutter device 11 fixed thereto move in parallel. , is displaced in the optical axis direction between the extended position and the retracted position. At this time, the fitting between the guide shaft 16 and the notch 10c prevents the base plate 10 from rotating in a plane perpendicular to the optical axis. Further, the sliding contact portion 17a of the cam plate 17 comes into elastic contact with the fixed wall surface, so that the guide shaft 1B and the notch 10c come into contact without play. Therefore, the plywood 10 moves in parallel in the optical axis direction while maintaining the optical axis perpendicular to the optical axis without decentering the optical axis of the main optical system 3.

A reduction gear train 25, a cam gear 26, and a drive member 27 are pivotally supported on the back surface of the plywood 10, 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 integral with the gear 13, and the final gear 25b of the reduction gear train 25 meshes with the cam gear 2B.

The cam gear 26 and the drive member 27 are coaxial, and are coupled via a front cam 28a provided on the end face of the cam gear 2G.

The reduction ratio of the reduction gear train 25 is set as follows. That is, when the main optical system 3 is in the extended position, the sub optical system 4 is placed in the insertion position (illustrated by imaginary lines in FIG. 2) into the photographing light beam, and when the main optical system 3 is in the retracted position, The sub-optical system 4 is placed at a retracted position (indicated by a solid line in FIG. 2) where the sub-optical system 4 is retracted from the photographing light beam.

8 and 9 show detailed sectional views of the sub-optical system insertion/removal mechanism.

In the figure, a main optical system 3 and an aperture/shutter device 11 are fixedly mounted on a plywood 10 in front of an opening 10a.

A positioning means 2 for the sub optical system 4 is formed behind the opening 10a. The positioning means 28 includes an inner cylindrical surface 28a centered on the optical axis of the main optical system 3, and a cone-shaped guide surface 2.
8b, and a contact surface 28c perpendicular to the optical axis of the main optical system 3.

A holding cylinder 4a that integrally holds the sub-optical system 4 is engageable with the positioning means 28, and when engaged, the optical axis of the sub-optical system 4 is aligned with the light of the main optical system 3 in the extended position. The sub optical system 4 is aligned with the optical axis, and the sub optical system 4 is positioned at a predetermined position in the direction of the optical axis.

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

The drive member 27 is slidably supported in the axial direction via a bearing portion 27a on a fixed shaft Log implanted in one plywood 1G. A circumferential groove 27b is formed in the drive member 27 to accommodate the sub optical system 4 in a loosely fitted state.

A flange 4 is provided on the outer periphery of the holding cylinder 4a of the sub-optical system 4 over the entire circumference.
d, and a coil spring 28 is inserted between the inner circumferential groove 27b and the collar 4d. This spring 23 is
Positioning means 28 for sub-optical system 4 brought to the insertion position
The function is to bias it in the direction of contact.

A cam gear 26 is also pivotally supported on the shaft 10g, and a sliding contact portion 27c provided at one end of the drive member 27 can slide into a front cam 28a formed on this end surface.

To the vehicle 10g, there are collars 10h and 1 so as to sandwich the bearing part 27a.
0i is fixedly installed, and a spring 30 is inserted between the collar toh and the drive member 27. The spring 30 functions to press the sliding portion 27c of the drive member 27 against the cam 28a or to press the front end surface of the bearing portion 27a against the collar 10i.

Locking members 10j and 10k are implanted in the plywood 10 to lock the free end 27d of the drive member 27, and the locking members 10j lock the drive member 27 when the sub optical system 4 is brought to the insertion position. A sub-optical system 4 is attached to the locking member 10.
When the drive member 27 is brought to the retracted position, the swinging of the drive member 27 is stopped.

Further, near the end of the locking member 10, a circular hole 10 is provided into which the small cylinder 4C of the sub-optical system 4 brought to the retracted position is loosely fitted.

FIG. 8 shows the state when the sub-optical system 4 is in the insertion position and in the fully inserted position in which it is engaged with the positioning means 28. The sub optical system 4 also takes the following positions.

In other words, there is an incomplete insertion position where the small cylinder 4C is pushed up by the front cam 28a and does not engage with the positioning means 28, although it is in the insertion position, and the small cylinder 4C is pushed up by the front cam 28a although it is located above the circular hole 10. A completely retracted position (shown in FIG. 9) in which the small cylinder 4C has fallen into the circular hole 101 and a completely retracted position in which the small cylinder 4C has not fallen into the circular hole 101.

FIG. 11 and FIG. 12 show front views of the sub-optical system retrograde prevention mechanism that interlocks with the sub-optical system insertion/removal mechanism.

A blocking plate 30a fixed to a blocking gear 30f meshing with the cam gear 2B has a first small diameter portion 30b and a first small diameter portion connected in sequence.
The second small diameter portion 30d and the second engaging surface 3
0e. The first engaging surface 30c and the second engaging surface 30e can each engage with an engaging 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 in a fully retracted position or an incompletely retracted position, and FIG. 12 shows a state in which it is locked in a fully inserted position or an incompletely inserted position. .

Figure 821 shows a cam diagram of the cam 28a.

The cam 28a has a lifting height of O as the rotation angle e changes from O to el.
A first flat section A where the lift does not change at , a first slope section B where the lifting head increases linearly from O to hl from el to e2, and a second flat section C where the lifting head does not change at hl from e2 to e3. , a second slope section in which the lift linearly decreases from hl to 0 from e3 to 380°.

The cam 28a has three effects on the sub-optical system 4.

The first effect 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 effect is to displace the sub optical system 4 between the incomplete insertion position and the incomplete retraction position in a direction transverse to the optical axis of the main optical system 3. The third effect is to displace the sub optical system 4 in the optical axis direction of the main optical system 3 between the incompletely retracted position and the completely retracted position. The details will be described later.

As shown in FIG. 2, a rack 51 is erected on the back surface of the plywood 10. The rack 51 is guided by a guide shaft 51a whose base end is implanted in the substrate 1c and whose front end is loosely fitted into the plywood 10.

The transmission shaft 5 is attached to the rack teeth 51b carved on the rack 51.
Binion 52a fixed to the lower end of 2 is engaged,
The transmission shaft 52 is a photographing optical system and a finder optical system.

A partition plate (not shown) that blocks light and separates the AF optical system, etc.
penetrates through.

A spur gear 52b fixed to the upper end of the transmission shaft 52 is meshed with a reduction gear 53a, and a cam member 53, which is a control member, is pivotally supported at the upper end of the shaft 50 of the gear 53a.

A cam plate 71 is fixed to the cam member 53 (13th
(See Figure 14). The cam plate 71 works in conjunction with an active triangulation automatic focusing (hereinafter referred to as AF) device after a cam lever 73, which will be described later, and a photographing optical system 3.4. Further, a detection brush plate 61 is planted on the upper surface of the cam plate 71 and comes into sliding contact with a printed circuit board B2, which will be described later.

The brush plate 81 has four brushes Ella, Blb, 81c, and Bid formed of the same conductor and electrically connected to each other.

A fixing column 50a is provided upright on the reduction gear 53a, and a screw 7 is inserted into an adjustment slot 71a formed in a cam plate 71.
1b is screwed into the upper end of the fixing column 50a, so that the 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, so the reduction gear 53a is also biased and the gear 53a is biased. and 52b and between the gear 52a and the rack 51b are suppressed.

An encoder printed circuit board 62 is disposed above the cam plate 7e. The printed circuit board 62 is locked at its center by the pivot shaft 50 of the cam member 53, and has an adjustment slot 82a at its periphery.
is provided, and the position is adjusted and fixed by a set screw G2b that is screwed into a threaded emboss formed on the camera body l.

On the lower surface of the printed circuit board 62, as shown in FIG.
is provided.

The sliding contact pattern 63 includes, from the inner circumference, a first pattern 63a for grounding, a second pattern 63b for photographing, a third pattern 63C, a fourth pattern 83d, and a fifth pattern 1.
33e is arranged. This corresponds to the fact 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. , overall sliding contact pattern 83
are arranged so that the circumference is divided into a wide-angle region W as a first region, a transition region N as a second region, and a telephoto region T as a third region.

The fifth pattern 83e is for region discrimination and is provided in the telephoto region T, and is nested between the second pattern 83b, the fourth pattern 83d, or the third pattern Ef3c. Terminals 84a to 84e connected to each pattern 83a to 83e are provided at the end of the printed circuit board 62.

A pattern 6 for sliding contact with the photographing optical system is placed on the outermost circumference of the fourth pattern Hd and a part of the fifth pattern 83e.
Reference position adjustment pattern 63f that determines the positional relationship with 3
is installed. The reference position adjustment pattern 83F has a width that corresponds to the required positioning accuracy.
Reference position adjustment pattern 63f! An adjustment terminal 84f that controls Ic is provided at the end of the printed circuit board 62. Each pattern B3a to 83e has a brush f3 of the brush plate 61.
1a, f31b, 81c, Old (7) The tips are in contact with each other.

The brushes 81a, 81b, 81c, and 61d rotate 360 degrees around the axis 50 in conjunction with the movement of the photographic optical systems 3 and 4 from the infinity position in the wide-angle area to the close position in the telephoto area. Rotate at the following angles. Each brush 61a
, Blb, 81c, and Bid, depending on the position of contact, that is, the position of the photographing optical system, each of the above patterns 83a to 63e.
Each electrical signal output from changes digitally. By decoding each of these electrical signals, the photographing optical system 3,
A photographing optical system position signal indicating the position No. 4 is obtained. Also,
The switch SW3, which will be described later, is activated by this photographing optical system position signal.
, S14, and SW5 are controlled to turn on and off.

That is, when each of the brushes 61a, Blb, 61c, and Bid comes into contact with its corresponding pattern and becomes conductive, a circuit (not shown) emits a Low signal, and when the brushes come out of the pattern and come into contact with an insulating part, the old gh signal is emitted. The output from pattern 83b is code A.
Similarly, assuming that code B is output from pattern 83d and code C is output from pattern 83c, various step outputs as shown in the following table can be obtained by combining these code outputs.

In both the wide-angle area W and the telephoto area T, the switching point (2) in steps 8 to 7 is the reset position which is the starting point of distance measurement for the photographing optical system, and is the wide-angle infinity point a or the telephoto infinity point on the cam surface, which will be described later. It corresponds to point f.

The step full 6 switching point ■ is a no-signal stop position, and in the case of active autofocus adjustment, if you try to take a picture at an infinity position, the reflected light from the light emitting element will be weak and will not return, so there will be no signal. The objective is to stop the photographing optical system at the signal stop position and take a photograph.

Steps 6 to 1 are for providing position information to so-called flashmatic control, which keeps the amount of light emitted by the strobe constant and controls the photographing conditions using the aperture when the strobe is used.

Switching point (2) in steps 2 to 51 is the closest distance stop position, and is used to stop the photographing optical system that has been extended from the telephoto position to prevent it from running out of control. In the wide-angle area W, steps 8 to 1 are arranged clockwise, and in the telephoto area T, steps 8 to 2 are provided, with step 1 not omitted, and steps 3 to 2 are switched. The point ■ is the closest stop position.

The patterns 83a to 83e are arranged closer to the outer periphery depending on the required precision. This is because the amount of movement relative to the angular displacement is larger on the outer periphery, so detection can be performed with higher accuracy.

That is, the pattern 83a is a ground pattern and only needs to be in sliding contact with the brush 81d of the brush plate 61, and the pattern 83b is used only for flashmatic control, so it does not require much positional accuracy.In contrast, the pattern 83d is where the step full 6 switching point ■ is output, and at long distances, the focus position is greatly affected by a small amount of lens movement. What it looks like is the diameter of the circle of confusion on the vertical axis.

This will be explained with reference to Fig. 22, which shows the depth of field at a certain extension amount of the photographic lens with distance on the horizontal axis. In Fig. 1, δ indicates the diameter of the permissible circle of confusion, and A, B, and TS are the allowable confusion at a certain extension amount. This is the depth of field when the circle diameter is δ. A is 10
When the amount of extension reaches m, the focus is in the range up to 5m-■.

One is when the amount of movement is such that focus is achieved at a slightly longer distance than that.
It is shown that the images are in focus within the ranges of 5 m-oo and 8 m-(1), respectively.

When the in-focus range moves from A to A to A, the amount of lens extension is very small. If you want to assume that the no-signal stop position is position A, as a range worker who can focus, the pattern of the stop signal will be slightly shifted, resulting in a focus range that looks like A.

If the subject is between 5 and 6 meters, or between 5 and 8 meters, it will not be in focus at all.

Furthermore, since the pattern 83c outputs a stop signal and a reset signal at close range, high accuracy is required.

Since the adjustment of the reference position of the pattern 83f determines the overall accuracy, even higher accuracy is required. Therefore, these patterns that require high precision are placed on the outer periphery.

The switch SW3 is turned off when the main optical system 3 is in the retracted position, the switch SW4 is turned off when it is in the extended position, and the switch SW5 is turned off when it is located between the retracted position and the extended position.

Switches SW3 and SW4 function as limit switches, and cut off the power supply to the motor 12 when the main optical system 3 is displaced to the retracted position or the extended position.

The switch SW5 is a switch that prevents the shutter release from being performed when the main optical system 3 is at the intermediate position of the above-mentioned reposition and cannot form a subject image on the film surface, and is a switch that prevents the shutter release from being performed. This is a switch for cutting off power supply to the circuit 31 (shown in FIG. 9).

In FIGS. 15 and 16, the cam member 53 serves as a control member of the finder switching mechanism, and has a cam groove 54 carved in its lower part, a starting tooth 53b on one periphery, and one tooth missing from the starting tooth 53b. Continuous driving teeth 53c, sliding contact edges 53
d is formed.

The switching drive member 55 is located close to the cam member 53 and the swing shaft 55
It is pivotally supported to the finder storage section 1a via a. The switching drive member 55 is connected to the activation tooth 5 of the cam member 53.
3b, a starting tooth 55b corresponding to the driving tooth 53c, and a driving tooth 5
5c, a first cam surface 55e in a substantially radial direction formed around the swing shaft 55a, and a second cam surface 55f that is a circumferential surface; It consists of a swing arm 55h extending radially from 55a.

A first objective lens 58 having a positive refractive power is fixed to the tip of a support arm 55i extending upward from the tip of the swing arm 55h, and this first objective lens 56 forms a first finder optical system. There is.

The switching drive member 55 is biased clockwise in FIG. 15 by a spring 55j stretched between it and a bottle protruding from the finder housing 1a.

A second objective lens 57 with negative refractive power constituting the second finder optical system is swingably supported on a linear holder 58 via a swing shaft 57a, and the linear holder 58 is connected to a finder housing l.
It is supported to be movable in a straight line in the direction of the optical axis of the finder optical path within a.

An engagement rod 57c that extends downward is protruded from the lower end surface of the second objective lens 57, and its tip engages with the cam portion 55g of the switching drive member 55. Said rack 51° transmission shaft 52
．． Cam member 53. Switching drive member 55. Engagement rod 57c
etc. constitute the second finder optical system driving means.

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

The cam groove 54 of the cam member 53 engages with a driven pin 59 a that projects from the variable power swing lever 59 . The magnification swinging lever 59 has a base end pivoted to the main body 1 via a pivot 59b, and a bin 59c protruding from the end extending from the pivot 59b.
and the bin 1b fixedly attached to the main body 1, a toggle spring 59 holds the variable power swing lever 59 at the telephoto position and the wide-angle position.
d is stretched.

The cam groove 54 of the cam member 53 includes a first circumferential groove 54a that does not operate the driven pin 59a, a drive groove 54b that moves the driven pin 59a and swings the variable power swing lever 58, and a drive groove 54b that moves the driven pin 59a and moves the driven pin 5i3a. It is configured by a second circumferential groove 54c that does not allow

A substantially U-shaped groove 59 is provided at the tip of the variable power swing lever 59.
e is formed, and the distal end of a vertically moving rod 58e extending downward from a linearly moving connecting arm 58d projecting rearward from the linearly moving holder 58 is engaged with the split groove 59e.

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

That is, a cam surface is formed integrally with synthetic resin on the outer periphery of the cam plate 71, and this cam surface moves from the wide-angle infinity point a to the wide-angle closest point as shown in FIGS. A wide-angle area C, a transition area d, a standby area e, and a telephoto area from the telephoto infinity point f to the telephoto point g are continuously formed. The direction of the light projecting element 8C is set to be the same as the wide-angle infinity point a, which is the starting point of the focusing operation in the wide-angle area C, and the telephoto infinity point f, which is the starting point of the focusing operation in the telephoto area. In contrast, the wide-angle closest point and the telephoto closest point g are not the same due to the difference in shooting limit distance.In addition, in this embodiment, the sub optical system 4 is integrated with the main optical system 3 when inserted. Since it moves in the axial direction, the cam shapes in the wide-angle area C and the telephoto area are not the same, but the sub optical system 4 is only inserted and removed and is not displaced in the optical axis direction, and only the main optical system 3 In the photographing optical system that is displaced in the axial direction, the cam shape is the same except for the vicinity of the closest point.

As shown in FIG. 2, 131ffl, the driven end 73 of the cam lever 73 is pivotally supported on the camera body l via the pivot shaft 72.
a is in sliding contact with this cam surface, and the driven end 73a is always pressed against the cam surface by a spring 73b that biases the cam lever 73.

An engagement pin 73c is fixed to the other end of the cam lever 73,
The engagement pin 73c engages with an engagement arm 75a of an interlocking lever 75 that is pivotally supported on the camera body l via a pivot shaft 74. A light emitter holding lever 76 is installed concentrically with the interlocking lever 75.
is pivotally supported via a pivot 74.

The interlocking lever 75 is urged counterclockwise when viewed from above by a spring 75b wound around the pivot shaft 74, so that the engagement arm 75a is brought into contact with 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 adjustment eccentric pin 75c is erected at the end of the interlocking lever 75, and the top 75d of the adjustment eccentric pin 75c is inserted into a long hole 78a at the end of the light emitting element holding lever 76. Engagement arm 75a of interlocking lever 75 and light emitting element holding lever 7
A tension spring 71ib is stretched between the end portion of θ.

The interlocking lever 75 and the light emitting element holding lever 7B operate almost integrally, and the light emitting element 8C is held by the light emitting element holding lever 78, and the camera body is held together by the spring 78c as a whole, as shown in FIG. It is urged downward in the figure so as to come into contact with the end face of the bearing portion of 1, and is pivotally supported by the bearing portion.

FIG. 2 further shows a finder distance display switching mechanism.

That is, a driven lever 82 is pivotally supported on the camera body 1 via a pivot 81, and a driven pin 82a fixed to one end of the driven lever 82 is connected to a cam groove 1 formed in a direct-acting cam plate 17.
7b.

A slide lever 83 is connected to the driven lever 82.
It is supported so as to be slidable in the lateral direction via pins 84a and 84b erected in the camera body 1 and guide holes 83a and 83b formed in the slide lever 83.

An engagement pin 83c is fixed to one end of the slide lever 83, and the engagement pin 83c engages with a fork portion 82b formed at the other end of the driven lever 82.

The slide lever 83 is provided with pointers 83d and 83e that are located in front of the fixed lens 7a of the finder optical system and can be selectively placed within 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 a path from the positive electrode of the power source E to the switch SW3 to the switch 5W7a to the motor 12 to the switch 5W7b to the negative electrode of the power source E. By supplying power through this path, the motor 12 rotates, displacing the main optical system 3 to the retracted position and displacing the sub optical system 4 to the retracted position.

The second path is a path from the positive electrode of the power source E to the switch SW4 to the switch 5W8a to the motor 12 to the switch 5W8b to the negative electrode of the power source E. By supplying power through this path, the motor 12 rotates in the opposite direction to that in the first path, displacing the main optical system 3 to the feeding position and displacing the sub optical system 4.
to the insertion position.

Here switches 5W7a, 5W7b, 5W8a, SW8
b is a semiconductor switch whose opening/closing is controlled by a logic circuit 40 (shown in FIG. 20), which will be described later.

The third path is the automatic focus adjustment/shutter control circuit 31
and the motor 12, and this control circuit 31
The output of the motor 12 causes the motor 12 to rotate forward and reverse, moving the optical system back and forth in the optical axis direction and bringing the optical system into focus.

In the power supply path of this control circuit 31, switches 5W1a and SW5 connected in series are inserted. switch 5w
1a is a semiconductor switch controlled by the switch SWI and opened and closed in the same phase as the switch SWI.

It turns ON only when the dustproof cover 2 is in the open position. The switch SW5 is turned ON only when the main optical system 3 is at the extended position and the retracted position (when the sub optical system 4 is at the fully inserted position and the fully retracted position). These prevent automatic focus adjustment and shutter operation when the dustproof cover 2 and optical systems 3 and 4 are in positions inappropriate for photographing.

FIG. 20 shows a logic circuit 40 that controls the operation of the motor control circuit of FIG. 19. This logic circuit 40 includes a pair of input terminals 40a, 40b, a pair of output terminals 40c,
40d. The input terminal 40a is connected between the switch 5i11 and the grounding resistor, the input terminal 40b is connected between the switch SW2 and the grounding resistor, the output terminal 40c is connected to the control terminal of the switches 5W7a and 5W7b, and the output terminal 40d is connected to the switch SW2. It is connected to the control terminals of 5W8a and 8b, respectively.

The input terminal 40a is at the old GH level when the switch 5ill is ON, that is, when the dustproof cover 2 is in the open position, and is at the Low level when the switch SWI is OFF, that is, when the dustproof cover 2 is in the closed position.

The input terminal 40b is at the old GH level when the switch SW2 is ON, that is, when the focal length selection member 5 is at the telephoto position, and is at the Low level when the switch SW2 is OFF, that is, when the focal length selection member 5 is at the wide-angle position. becomes.

When the output terminal 40c is at the old gh level, the above switch 5W
Turn both 7a and 5W7b ON, and turn them both OFF during Low L/Bevel. When the output terminal 40d is at High level, both the switches 5W8a and 5W8b are turned on,
Both are turned off when the level is low.

An input terminal 40a of the logic circuit 40 is connected to one input terminal of an exclusive O7 circuit 40e and one input terminal of a NOR circuit 40F. Input terminal 40b is connected to the other input terminal of exclusive OR circuit 40e and the other input terminal of NOR circuit 40f.

The output terminals of both circuits 40e and 40f are OR circuit 40g
are connected to the respective re-input terminals. 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.
The output terminal of h is connected to the output terminal 40d of the logic circuit 40.

The following table shows the position of the dustproof cover 2, the position of the focal length selection member 5, and switching depending on these positions.

The states of the switches 5ill and SW2, the input terminals 40a and 40b of the logic circuit 40, and the output terminals 40c and 40d (7
) Level, switch SW? a, 5W7b, 5W8a,
The relationship between the state of 5W8b and the positions of the main optical system 3 and the sub optical system 4 is summarized.

FIG. 23 shows a specific control circuit diagram of the camera according to this embodiment.

This control circuit diagram includes a decoder 204 that decodes the output of the encoder and outputs position information of the photographing optical system, a focus detection section 270, a drive section 280, and a switching section 290. The decoder 204 receives signals from the switches 201, 202, and 203 corresponding to the code A, code B, and code C, which are the outputs of the encoder, to an input terminal 201a.
~203a, each combined AND gate 205~2
12 and inverters 213 to 224, output terminal 205
a to 212a, and its output is determined by the aperture control circuit 2.
It is also connected to 25.

The focus detection section 270 includes a light emitting LED 243 connected to the focus detection circuit 240 via a transistor 242, and a light receiving element 241 connected to the focus detection circuit 240.
80 is a PNP transistor 235.2H and an NPN transistor 23 for switching the drive motor 12.
7, 238, and NOR gates 231, 233 . for controlling each transistor. It consists of OR gates 232 and 234.

The switching unit 290 has a D-flip-flop 258 and an NA
It has an R-S flip-flop tab consisting of ND gates 25fl and 257, and a delay circuit 260. A telephoto detection switch 258 is connected to the D input terminal of the D-7 flip-flop 259 via a terminal 258a, and the delay circuit 28
The output of 0 is input to the NAND gate 257 of the R-S flip-flop via the NAND gate 281, and the NAND
A resistor 255 and an optical system switching instruction switch 254 are connected to the D gate 256. The signal of the telephoto detection switch 258 is given by the encoder pattern 83e.

The focus detection circuit 240 of the focus detection section 270 includes an OR gate 244 . NAN
It is connected to a driving section 280 via an R-S flip-flop consisting of D gates 228 and 229 and an AND gate 230. The OR gate 244 has a reset terminal 244.
a is connected. Resistor 2 is connected to NAND gate 229.
27 and a hand switch 22B are connected. The switching unit 290 is connected to the inverter 282. A N D game) 2B
3,284 to the drive unit 280.

Decoder 204 includes AND gates 247 . NAND gate 281 . Connected to OR gate 224. Terminal 212a is inverter 2
R consisting of NAND gates 251, 252 through 53
-S is connected to a NAND gate 251 of the flip-flop, and a photographing optical system reset switch 249 and a resistor 250 are connected to the NAND gate 252.

Adjustments to be made when assembling the focal length switching type camera having the above configuration will be explained.

This adjustment can be roughly summarized into the following three categories.

■Adjustment to set the amount of extension necessary to switch the photographing optical system 3.4 from the wide-angle area to the telephoto area to a predetermined value. ■Photographing optical system 3.
An example of a specific procedure for adjusting the distance between the photographing optical system 3.4 and the film surface to a predetermined value. Adjustment to match the phase between the photographing optical system 3.4 and the cam member 53 etc. that follows it is as follows. It is.

■1 Plywood lO and attached main optical system 3, sub optical system 4. Parts such as the sub-optical system insertion/removal mechanism are made into one unit, and attached to a specified jig. This jig includes a guide member that supports one plywood lO so that it can be guided in the optical axis direction of the main optical system 3;
It is equipped with a collimator for inspecting the focal length of the main optical system 3 and the combined optical systems 3 and 4.

■The main optical system 3 alone constitutes the photographing optical system, and the main optical system is set in a wide-angle state, using a collimator so that the object at the first predetermined distance (for example, at infinity) is imaged on a plane corresponding to the film plane. Adjust the position of the optical system 3, that is, the plywood lO.

The plywood 10 is fed out by a predetermined amount from the adjustment positions m and n, and the sub-optical system 4 is inserted behind the main optical system 3, and the zero plywood 10 is fed out by a predetermined amount to achieve a telephoto state.

Then, the air distance between the main optical system 3 and the sub optical system 4 is adjusted using a collimator so that the object at a second predetermined distance (for example, infinity) is imaged on a plane corresponding to the film plane. . Since the sub-optical system 4 is held by a support tube 4e screwed onto the drive member 27, the sub-optical system 4 can be moved in the optical axis direction by rotating the support tube 4e, and the main optical system You can adjust the air spacing between 3 and 3.

An example of a specific procedure for adjustment (2) is as follows.

(2) Assemble the unit into the camera after completing the adjustments in Steps to M above, and insert it into the optical path of the collimator.

(2) As shown by the solid line in FIG. 2, a wide-angle photographing optical system is composed only of the main optical system 3, and the spur gear 52b and the reduction gear 53
The cam member 53 is in a disengaged state, that is, the cam member 53
and the photographing optical system 3.4 is disconnected.

(2) After roughly adjusting the plywood lO that has been supplied with power to the motor 2 to the approximate position, the power supply to the motor 2 is stopped. Then, the main optical system 3 uses a collimator to adjust the position of the plywood lO so that the object at a third predetermined distance # (for example, 2.4 m) is imaged on the film plane. Loosen the setscrew 15a shown in Fig. 2 and Fig. 10, and remove the guide shaft 1.
This is done by fitting the tip of a driver into the slot 1.5c of No. 5 and rotating the guide shaft 15. As is clear from FIG. 10, the guide shaft 15 itself cannot move in the axial direction, so it rotates relative to the gear 14, and since the motor 12 is stopped, the gear 14 also does not rotate. lO moves back and forth in the optical axis direction. When the adjustment is completed, set screw 15a
are fastened to fix the guide shaft 15.

An example of a specific procedure for the adjustment in (2) is as follows.

(1) First, an adjustment is made to determine the positional relationship of the cam member 53 (cam plate 71) with respect to the photographing optical system 3.4 and the cam lever 73. In a state where the above adjustment (2) has been completed, that is, with the main optical system 3 in a position where the object at the third predetermined distance is imaged on the film surface, the spur gear 52b and the reduction gear 53
a, so that the cam member 53 and the photographing optical systems 3 and 4 can interlock with each other. Loosen the screws 71b shown in FIGS. 2, 13, and 14, and remove the cam member 53 (cam plate 71
) can rotate within the range of the elongated hole 71a. As shown in FIG. 13, the driven end 73 of the cam lever 73
The mark attached to a and the mark attached to the cam plate 71 are made to face each other, and the screw 71b is fastened. The index on the cam plate 71 indicates the position that the cam plate 71 should take with respect to the driven end 73a when the automatic focus adjustment device detects that the subject is at the third predetermined distance. When completed, the cam member 5 is attached to the photographing optical system 3.4 and the cam lever 73.
3 (cam plate 71) is determined.

(6) Next, adjust the position of the encoder printed circuit board 82 with respect to the photographing optical system 3.4. First, the screw 82b is loosened so that the encoder printed circuit board 62 can rotate around the shaft 50 within the range of the elongated hole 82a. and,
When the photographing optical system 3.4 is focused on the subject at the third predetermined distance, the encoder printed circuit board 62 is positioned at the position to be taken, and the screw 82b is fastened. The position that the board 82 should take is the position where the photographing optical system position signal indicating that the photographing optical system is focused on the subject at a third predetermined distance is provided on the bottom surface of the board 62. This is the position obtained from the pattern.

As described above, when the driven end 73a of the cam lever 73 faces each of the wide-angle infinity point a, the telephoto infinity point b, the telephoto infinity point f, and the telephoto infinity point g of the cam plate 71, the photographing optical system is set to a wide-angle position. The camera accurately focuses on objects at infinity in the same state, close-up in the same state, infinity in the telephoto state, and close-up in the same state, and accurate photographic optical system position signals are obtained from each of the sliding contact patterns. can get.

Next, a signboard is placed at the predetermined subject distance (for example, 2.4 m) on the optical axis of the main optical system 3 where the AF optical system is adjusted, and the light emitting element 8C is energized and the light receiving element 8d is Make it incident. Then, the eccentric pin 75c is rotated to adjust the direction of the light emitting element 8C so that the output of the light receiving element 8d is in a predetermined focus detection state.

Since the wide-angle area C and the telephoto area of the cam plate 71 are separated by the rotation angle corresponding to the first predetermined amount of extension, the entire area of the cam surface of the cam plate 71 can be adjusted by only the above adjustment. This means that it has been completed.

Each adjustment is now complete.

Next, the operation will be explained.

(1) As shown in Figure 3, the dustproof cover 2 is in the open position,
When the focal length selection member 5 is at the telephoto position and the main optical system 3 is already at the extended position, both switches SWI and SW2 are in the ON state, so the input terminal 40 of the logic circuit 4G
Both a and 40b are at the old GH level. The output terminals of exclusive OR circuit 40e and NOR circuit 4Of are Low.
level, and the output terminal of the OR circuit 40g also becomes low level. Output terminals 40c and 40d of the logic circuit 40 are at Low and High levels, respectively.

As a result, the switches 5W7a and 5W7b shown in FIG.
is turned off, and switches 5W8a and 5W8b are turned on.

Since the main optical system 3 is in the extended position, the switches S%13゜SW4 and SW5 are turned ON, OFF, ON +
7) It is in condition g.

Since the switches 5W7a and 5W7b are OFF, the first path is not formed, and since the switch SW4 is OFF, the second path is not formed.

In this case, the main optical system 3 is at the feeding position, and the sub optical system 4 is at the eighth position.
As shown in the figure, they each stand still at the fully inserted position where they are fully engaged with the positioning means 28, and both optical systems constitute a composite optical system, whose focal length is in the telephoto range.

Since the switches 5W1a and SW5 are both ON, the automatic focus adjustment/shutter control circuit 3! is in operational state and capable of photographing with a telephoto optical system.

Further, the finder optical system is also in a telephoto state as shown in FIG. 15 in which the first objective lens 5B is positioned in front of the second objective lens 57.

When a shooting start operation is performed by pressing a release button (not shown), the motor 12 receives power through the third path and rotates, moving the optical system 3.4 in the optical axis direction between the infinity and close range positions in the telephoto range. to adjust the focus. Main optical system 3, sub optical system 4, and base plate 1 for focus adjustment for telephoto shooting.
0 is displaced back and forth.

Photographing in the telephoto state and photographing in the wide-angle state are almost the same, and the method of photographing will be explained later for the wide-angle state.

As shown in FIG. 15, when the cam member 53 rotates with the rotation of the motor 12 for focus adjustment in the telephoto range, the vertical rod 58e of the linear holder 58 is inserted into the split groove of the variable power swing lever 58. It is sandwiched between one inner wall of the cam member 59e and the rear end of the guide groove 1f provided in the finder housing 1a, and the activation teeth 53b of the cam member 53 and the activation teeth 55b of the switching drive member 55 are separated from each other, and the magnification is changed. The driven pin 59a of the swing lever 58 is connected to the first circumferential groove 54a of the cam groove 54 of the cam member 53.
, and the driven pin 59a does not come into contact with the side wall of the first circumferential groove 54a, so the finder optical system will not be switched or vibrated due to operation.

(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.
The input terminal 40 of the logic circuit 40 in FIG.
b becomes the Law level. Exclusive O7 circuit 4
Since the output terminal of 0a is at the old gh level, OR circuit 4
The 0g output terminal is inverted to the old gh level, and the logic circuit 40
The output terminals 40c and 40d are old GH and Low, respectively.
Flip to level.

As a result, the switches 5W7a and 5W7b shown in FIG.
is ON, and switches 5W8a and 5W8b are OFF.
becomes.

The main optical system 3 is in the extended position, and the switches SW3 and SW
4.

Since SW5 is in ON, OFF, and ON states, and switches 5W7a and 5W7b are ON, the first path is formed and the motor 12 is started. Therefore, the main optical system 3 begins to be displaced from the extended position toward the retracted position.

The sub optical system 4 is displaced in the optical axis direction from the complete insertion position (shown in FIG. 8) where it engages with the positioning means 2 during the initial rotation of the motor 12, and reaches the incomplete insertion position where it does not engage with the positioning means 2. Displaced to. This displacement in the optical axis direction is caused by the cam 28a being
This is done by rotating counterclockwise from the state shown in FIG. 2 and pushing up the sliding contact portion 27c of the drive member 27 in the first slope section B.

The cam 26a contacts the sliding portion 2 of the drive member 27 in the first slope section B.
7c, the engaging portion 27e of the drive member 27 comes into contact with the first engaging portion 30c from a position facing the first small diameter portion 30b of the blocking plate 30a. and,
Before the sub optical system 4 reaches the incomplete insertion position, the engaging portion 27e
is disengaged from the first engaging portion 30c, and the second small diameter portion 3
It reaches a state opposite to 0d.

FIG. 12 shows the state just before that.

When the sub optical system 4 reaches the incomplete insertion position, the positioning means 28
Release the engagement with the engaging part 2? When e faces the small diameter portion 3 (ld), the drive member 27 can swing in the direction transverse to the optical axis, so as the motor 12 continues to rotate, the sliding contact portion 27c
is pushed by the first slope section B and swings counterclockwise in a plane that crosses the optical axis of the main optical system 3.

At this time, as shown in FIGS. 8 and 9, the end face of the small cylinder 4c of the sub-optical system 4 is in sliding contact with the back surface 10 layers of the plywood lO, which is perpendicular to the optical axis of the main optical system 3, in the same direction. to sway. When the main optical system 3 approaches the stapling position, the free end 27 of the drive member 27
d comes into contact with the locking member 10k and is prevented from swinging, and the sub optical system 4 reaches the incompletely retracted position where it is not inserted into the circular hole 10i.

Since the motor 12 continues to rotate after that, the drive member 2
7 sliding contact part 2? c ascends the first slope section B of the cam 26a and reaches the second flat section C. At this time, the blocking plate 30
The second engaging portion 30c of the drive member 27 is the engaging portion 27e of the drive member 27.
be associated with

Subsequently, the sliding contact portion 27c slides down the second slope section. At this time, due to the action of the spring 30, the sliding contact portion 27c may slide down along the second slope section and rotate clockwise, causing the sub optical system 4 to move back toward the insertion position.
This backward movement is prevented by the engagement between the second engaging portion 30e and the engaging portion 27e.

As the sliding contact portion 27c slides down along the second slope section, the front end surface of the bearing portion 27a touches the flange 10 as shown in FIG.
i, the sliding contact portion 27c separates from the cam 28a and reaches a state where it faces the first flat section A but does not come into contact with it.

Due to the accompanying 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 101 of the base plate lO, and the end surface 4b of the holding cylinder is inserted into the circular hole 10! It comes into contact with the edge of L and reaches the fully retracted position. At this time, the main optical system 3 has reached the retraction position. At this time, the engaging portion 27e is disengaged from the second engaging portion 30e and faces the first small diameter portion 30b.

Note that after the front end surface of the bearing portion 27a comes into contact with the collar 10i and the driving member 27 stops displacing in the optical axis direction,
The biasing force for inserting the sub optical system 4 into the circular hole 1GM is provided by the spring 2.
8 supplies.

When the main optical system 3 reaches the retraction position, the switches SW3 and SW4.51115 shown in FIG.
F.ON.

It will be in the ON state. When the switch S%13 is turned off, the first path is cut off and power supply to the motor 12 is stopped. Therefore, the main optical system 3 stands still at the retracted position, and the sub optical system 4 stands still at the completely retracted position.

The optical system consists of only the main optical system 3, and its focal length is in a wide-angle range. In addition, since both switches SWI and SW5 are ON, the automatic focusing fist shutter control circuit 3
1 is in an operational state, allowing shooting in a wide-angle area.

Further, in response to the change in the above state, the finder optical system is switched as follows by the finder switching mechanism. That is, the first finder optical system 6 is moved from the insertion position to the retracted position.

Because the telephoto state is switched to the wide-angle state, the base plate 1O moves back a lot, so the rack 51 moves back a lot, causing the rack teeth 51b, pinion 52a, transmission shaft 52 . Spur gear 52
b. The cam member 53 is largely rotated by the path of the reduction gear 53a.

The rotation of the cam member 53 causes the activation tooth 53b to push the activation tooth 55b of the fan-shaped portion 55d of the switching drive member 55, and further, the driving tooth 53c and the driving tooth 55c engage with each other. Teeth 55b and drive teeth 55c
There is one tooth missing between the two, so they start meshing smoothly without interference.

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

In synchronization with the angular displacement of the second objective lens 57, the first objective lens 5B draws an arc around the cam part 55 together with the switching drive member 55, and the end when the second objective lens 57 faces the front. Move by skimming.

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

After that, the driven pin 59a of the variable power swing lever 59 is moved to the cam groove 5.
The driving groove 54b is reached from the first circumferential groove 54a of No. 4. Then, the variable power swing lever 59 rotates clockwise about the pivot shaft 59b, thereby pushing the linear holder 5B forward via the split groove 59e, the driven rod 58e, and the linearly moving connecting arm 58d.

When the straight holder 58 is pushed forward, the engagement rod 57c
Since the tip of the switching drive member 55 is removed from the second cam surface 55f, the second objective lens 57 faces forward as before, and the linear holder 58 and the second objective lens 57 face forward without interfering with the cam portion 55g. 1 objective lens 56 and is pushed out to the original position of the first objective lens 5B, and the variable magnification swinging lever 59 is inverted and held at the wide-angle position by the toggle spring 59d, resulting in the state shown in FIG. 2, and the wide-angle viewfinder Becomes an optical system.

Simultaneously with the switching of each prefecture, the AF system and the distance display in the finder are also 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 region of the cam surface of the cam plate 71, but when the cam member 53 rotates, the driven end 73a is in the telephoto region. It passes through the telephoto infinity point f, which is the focusing operation start position, passes through the standby area e, which is a circumferential surface, and reaches the transition area d, enters the wide-angle area C, switches to the wide-angle state, and finally reaches the 17th point As shown in the figure, the driven end 73a is located at the wide-angle infinity point a, which is the focusing operation start position in the wide-angle region C.

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

Further, as the plywood 10 retreats when switching from telephoto to wide-angle, the direct drive cam plate 17 also retreats integrally to the state shown in FIG. 2, and the driven pin 82a engaged with the cam groove 17b is displaced. The pointer 83e that was visible in the finder in the telephoto state disappears from the field of view, and the pointer 83d comes into view.

When a photographing start operation is performed using a release button (not shown), the motor 12 receives power through the third path and rotates.

The main optical system 3 is advanced from the infinity position in the wide-angle region shown in FIG. 2 to the close position to adjust the focus.

As the motor 12 rotates, the gear 1 is
4 rotates, and since the gear 14 cannot move back and forth with respect to the plywood 10, it 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 from the transmission shaft 52 to the spur gear 52.
b. The rotational motion is converted into rotational motion and transmitted to the cam member 53 via the reduction gear 53a.

Since the gear 50b biased by the spring 50c is meshed with the reduction gear 53a, backlash during meshing is suppressed and transmission is performed with high precision.

When the reduction gear 53a rotates, the cam member 53 also rotates integrally, the driven end 73a follows the cam surface of the cam plate 71, and the cam lever 73 is rotated in accordance with the shooting distance. Since wide-angle photography is being performed, the driven end 73a moves from the infinity point a of the wide-angle area C toward the closest point.

For telephoto shooting, from the infinity point f in the telephoto area to the closest point g
move towards.

The displacement of the cam lever 73 results in a tilting of the light projecting element 8C, and the light beam from the light projecting element 8C is swung from infinity toward the closest direction. When this light beam hits the subject, it is reflected there and returns to the light receiving element 8d.

The change in the output state of the light receiving element 8d at this time is calculated by the distance measuring device, and the motor 12 is stopped when the focus detection output reaches a predetermined focus detection output. At this time, the photographing optical system (main optical system 3) is focused on the subject.

Upon completion of focusing, the light emitting element 8C also stops emitting light, and photography continues.

Since there is inertia in the cam member 53 and other parts, and there is a deviation between the signal and the stopping distance, the cam surface of the cam plate 71 is designed to take this into account.

When the base plate 10 moves back and forth, the cam groove 17b of the direct drive cam plate 17 allows the slide lever 8 to move through the driven pin 82a.
3 is moved in the horizontal direction, and the pointer 83d moves within the field of view of the finder, so that the approximate distance to the subject can be determined by the mark in the field of view indicated by the pointer while looking through the finder. For telephoto shooting, the pointer 83e has a similar function.

When the release button is released, the motor 12 reverses and the main optical system 3
is retracted to the infinite position in the wide-angle area, and the cam lever 73
The driven end 73a faces the infinity point a, and detection of the 0 position in preparation for the next photographing is performed by switches SW3, SW5.

During the rotation of the motor 12 for focus adjustment in the wide-angle area, the sliding portion 27c of the drive member 27 only faces the first flat section A and does not contact it, so the drive member 27 does not move and the sub optical system 4 remains in the fully retracted position.

In the wide-angle state, even when the cam member 53 is rotated for focus adjustment, the vertically moving rod 58e of the linear holder 58 is attached to the inner wall of the split groove 59e of the variable magnification swinging lever 58 and the finder housing 1a due to the urging force of the vertically moving rod 58e of the linear holder 58. It is held between the front end of the guide groove 1f and the front end of the guide groove 1f.

The driven pin 59a of the variable power swing lever 58 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 is moved within the range of the second circumferential groove 54c of the cam groove 54 of the cam member 53 so that the driven pin 59a does not come into contact with the side wall of the second circumferential groove 54c. Since the driven pin 51]a moves within the area of the second circumferential groove 54c of the cam groove 54, the variable power swing lever 59 does not swing, and the fan-shaped portion 55d of the switching drive member 55 moves. The end of the driving tooth 55c is the sliding contact edge 5 of the cam member 53.
3d, the second objective lens 57 is not displaced and is stably held.

(3) When the dustproof cover 2 is moved from the open position to the closed position from the telephoto state, the switch SWI turns OFF.
The input terminal 40a of the logic circuit 40 becomes Low level,
The output terminal of the exclusive OR circuit 40e becomes the old gh level. The following operation is similar to (2), and even though the focal length selection member 2 is at the telephoto position, the main optical system 3 is displaced from the extended position to the retracted position, and the sub optical system 4 is moved to the fully inserted position. It is displaced from the position toward the fully 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 5W1a, which is in phase with the switch SWt, is turned OFF, so power supply to the autofocus node yA/shutter control circuit 31 is cut off, and photographing becomes impossible.

Similarly, the finder optical system, AF system, etc. are also switched from the telephoto position to the wide-angle position.

(4) When the dustproof cover 2 is moved from the wide-angle state to the closed position, the switch 5W1a, which is in phase with the switch SWI,
Since it is FF, automatic focus adjustment/shutter control circuit 3
The power supply to 1 will be cut off, making it impossible to take pictures.

(5) When the focal length selection member 5 is switched from the wide-angle state shown in FIG. 4 to the telephoto position, the switch SW2 is turned on, and the input terminal 40a of the logic circuit 40 shown in FIG.
, 40b are both at the old GH level. The output terminals of the exclusive O7 circuit 40e and the NOR circuit 40f are both La
Since the level is W, the output terminal of the OR circuit 40g is Lo.
Inverted to w level, output terminals 40c, 4 of logic circuit 40
0d is inverted to Low and High levels, respectively.

As a result, switches 5W7a and 5W7 shown in FIG.
b is OFF, and switches 5W8a and 5W8b are OFF.
Since the main optical system 3 is in the retraction position, the switch s13 is turned on.

SW4. SW5 Ha, soreso OFF, ON, ON (
7) It is in the state m.

S4 y Chi 5118a, 5W8b are ON, Sui? Since the switch SW4 is ON, the second path is formed, and the motor 12 begins to rotate in the opposite direction to that in (2). Therefore, the main optical system 3 begins to be displaced from the retracted position toward the extended position.

With this initial rotation of the motor 12, the sub optical system 4.

It is displaced in the optical axis direction from the completely retracted position shown in FIG. 9, exits the circular hole 10, and is displaced to the incompletely retracted position.

This displacement in the optical axis direction is caused by the rotation of the cam 28a and pushing up the sliding contact portion 27c of the drive member 27 at the second slope section.

The cam 28a contacts the sliding portion 2 of the drive member 27 at the second slope section.
7c, the engaging portion 27e of the drive member 27 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 incompletely retracted position, the engaging portion 27e disengages from the second engaging portion 30e, and the second small diameter portion 30
It reaches a state where it faces d. FIG. 11 shows the state immediately before this.

Thereafter, the sub optical system 4 reaches the incompletely retracted position and the circular hole 10
When released from Q, the drive member 27 becomes swingable in a direction transverse to the optical axis of the main optical system 3.

As the motor 12 continues to rotate, the sliding portion 27c is pushed in the direction across the optical axis by the second sloped section, so the drive member 27 swings in the same direction, causing the small cylinder 4C of the sub optical system 4 to move. While the end surface slides on the back surface 10 of the base plate 10, it moves from the incompletely retracted position to the incompletely inserted position.

When the main optical system 3 approaches the extended position, the free end 27d of the drive member 27 comes into contact with the locking member 10j to prevent its swinging, and the sub optical system 4 stops at the incompletely inserted position. Since the motor 12 continues to rotate thereafter, the sliding portion 27c of the drive member 27 ascends the second slope section of the cam 28a, and
The second flat section C is reached.

At this time, the first engaging portion 30c of the blocking plate 30a engages with the engaging portion 27e of the drive member 27.

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

While the sliding part 27c is sliding down the second slope section, the front end surface of the bearing part 27a comes into contact with the flange 10i, so the sliding part 27c separates from the cam 2ea and faces the first flat section A, but makes contact with it. It reaches a state where it doesn't.

Due to the accompanying 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 connected to the positioning means 2.
After abutting against the guide surface 28b of FIG. 8, the end surface 4b of the holding cylinder 4a abuts against the abutment surface 28c of the positioning means 2B, and the holding tube 4a is inserted into the guide surface 28a as shown in FIG. At this point, the positioning of the sub optical system 4 is completed. At this time, the main optical system 3 has reached the feeding position. Further, at this time, the engaging portion 27e is disengaged from the first engaging portion 30c and faces the first small diameter portion 30b.

Note that the biasing force that causes the sub optical system 4 to engage with the positioning means 28 after the drive member 27 stops displacing in the optical axis direction due to the bearing portion 27a coming into contact with the collar 10i is as follows.

Spring 29 supplies it.

When the main optical system 3 reaches the extended position, the switches 9w3, SW4, and SW5 are in the ON, OFF, and ON states, respectively, as described in (1). switch SW
4 is turned off, the second path is cut off and power supply to the motor 12 is stopped. Therefore, as shown in FIG. 2, the main optical system 3 is stationary at the extended position, and the sub optical system 4 is stationary at the fully inserted position, forming nine composite optical systems.

Its focal length is in the telephoto range. Also switch 5W1
Since both a and 9w5 are ON, the automatic focus adjustment/shutter control circuit 31 is in an operable state, and photography with the telephoto optical system is possible.

In response to the above switching operation, the finder optical system is switched from the wide-angle state to the telephoto state.

That is, when the main optical system 3 and the sub-optical system 4 are switched to the telephoto state, the plywood lO moves forward greatly, so that the cam member 53 rotates greatly, contrary to the above.

As a result, the driven pin 58a of the variable power swing lever 53 reaches the drive groove 54b from the second circumferential groove 54c of the cam groove 54, and the variable power swing lever 59 changes from the state shown in FIGS. 14 and 15(C). rotates counterclockwise to pull back the second objective lens 57 and the linear holder 5B.

When the second objective lens 57 and the linear holder 58 retreat, the tip of the retaining rod 57c comes into contact with the second cam surface 55f of the cam portion 55g of the switching drive member 55, and the second objective lens 57
7 is held in an angularly inclined state about the swing axis 57a.

In synchronization with this, the driving teeth 53c mesh with the driving teeth 55c, the switching driving member 55 is rotated clockwise, and the housed first objective lens 5B is rotated clockwise in an arc around the swing axis 55a. Rotate to.

Next, the tip of the engagement rod 57c reaches the first cam surface 55e of the cam portion 55g, and finally the second objective lens 57 faces forward, and the linear holder 58 returns to the front of the second objective lens 57. The telephoto state shown in FIG. 15 is reached.

Similarly, the distance display in the finder is switched from the wide-angle state to the telephoto state by an operation opposite to that in (2) above.

(6) When the dustproof cover 2 is moved toward the open position from the state where the dustproof cover 2 is covered in the telephoto state, the switch SW
I is in the ON state, and the input terminal 40a of the logic circuit 40
, 40b are both at the old gh level. Below is the above (5)
The operation is the same as described in .

The photographing and optical system switching operations will be specifically explained below with reference to FIG. 23.

(b) The operations during shooting are as follows.

The photographing operation is the same in both the wide-angle region W and the telephoto region T.

The signal from the decoder 2G4 indicates the amount of movement of the photographing optical system, that is, the distance to the subject, and is input to the aperture control circuit 225 for flashmatic control when using a strobe, and photographing conditions are set according to each step. The photographing starts from step 8 in the encoder and distance measurement is performed.

When the hand switch 22B is turned on as the distance measurement start switch, 1 normally becomes H level at the resistor 227.
One side input of AND gate 229 becomes L. Since NAND gate 228 and NAND gate 229 constitute an R-S flip-flop, NAND gate 229
When one side of the input becomes L, the output of NAND gate 228 becomes H level, and this signal is applied to AND gate 230. If the value input to the AND gate 230 is H, the output of the AND gate 230 will be H, the NOR gate 231 controlled by that output will output I, and the OR gate 234 will output H,! : becomes, PNP) transistor 2
35 is turned on, the NPN transistor 238 is also turned on, and the PNP transistor 235. A current path for the drive motor 12°NPN) transistor 238 is formed, and the drive motor 12 rotates. The direction of rotation at this time is assumed to be normal rotation.

The photographing optical system is driven by the rotation of the drive motor 12,
At the same time, the light emitting LED 243 is tilted by the mechanism and the 0-focus detection circuit 240 scans the light receiving element 24.
According to the output state 1, H is output when in focus.

This H signal is given to the OR gate 244 via the inverter 245, and all the value inputs of the OR gate 244 are L.
If so, the output from the focus detection circuit 240 is used to OR
Gate 244 outputs an L signal, which is input to NAND gate 228, and the output of NAND gate 229 is reset to L. Therefore, the output of the AND gate 230 also becomes L, and the NO that was driving the drive motor 12 until then becomes L.
Since the output of the R gate 231 becomes H and the output of the OR gate 234 becomes L, the PNP transistor 235. NPN) transistors 238 are turned off, and the drive motor 12
stops and a photograph is taken.

When 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 at H level by the resistor 250, is set to H level. NAND gate 251. N A N D gate 25
2 constitutes an R-37 lip-flop, so it is NAN.
D gate 252 is held in that state.

When the NAND gate 252 is set to H, the NOR gate 233 and OR gate 23 connected to it
2 outputs H, PNP) transistor 2
3B, N P N ) transistor 237 is turned on,
PNP) Langimeta 236. Drive motor 12. NPN)
A current path is formed by the transistor 237 and the drive motor 1
2 is reversed. This reversal is an operation in which the photographing optical system is brought into step 8 from a position other than step 8.

When the drive motor 12 reverses, the photographing optical system is retracted and step 8 is entered, the AND gate 2 of the decoder 204
12 outputs H to the terminal 212a, which causes one side input of the NAND gate 251 to become L through the inverter 253, so that the output of the NAND gate 252 is set to L, and the NOR gate 233. The OR gate 232 becomes an output, the PNP transistor 238 is turned off, and the drive motor 12 is stopped.

The above is the operation from the start of shooting to resetting in preparation for the next shooting.

Until the focus is focused, the output of the focus detection circuit 240 is input to the OR gate 244 via the inverter 245.
and the output of terminal 212a are connected, and these become H in step 7 and step 8, respectively.

As described above, press the hand switch 2 to start the focus detection.
26 is turned on, 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. 1, and in either case, the starting point is step 8. Therefore, in the range of the positions of steps 8 and 7, the output is always H, and even if a focus detection signal from the focus detection circuit 240 is input, that signal will be 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, etc., it will be masked.

In addition, if the subject is at infinity, the focus detection circuit 240
The output is set to output an H signal from the beginning,
If the outputs of the terminals 211a and 212a of the decoder 204 are H, in step 7.8 the NAND gate 22
The output of 9 is not reset and enters step 6 to output terminal 2.
11a, the drive motor 12 stops when the output of the terminal 212a becomes L. Set this position as infinite distance. Note that this infinite distance setting may be set as a hyperfocal distance if the depth of field of the optical system is taken into account.

In addition, in a state where the focus detection circuit 240 does not output a focus detection signal, that is, when the subject distance is too short, N
The AND gate 228 is not reset and the drive motor 12 continues to rotate normally, but in this case, the AND gate 228 is not reset.
NOR gate 2 input to one side of D gate 230
The operation is controlled by 48. That is, the NOR gate 246 determines whether the output of the output terminal 205a of the decoder 204 is H2, that is, step l, or the telephoto detection switch 25.
When the output of the terminal 206d of the decoder 204 in the ON state is detected as H2, that is, step 2, an L output is generated, and the output of the AND gate 230 is forced to be L. This is nothing but a restriction on the position in which the photographic optical system is extended. In this embodiment, the position is limited in step 1 in the wide-angle range, and in step 2 in the telephoto range, but the same steps may be used.

Further, when the output of the AND gate 230 is controlled by the output of the NOR gate 246, the NAND gate 229 remains unreset, but resetting at this time can be performed by inputting L to the reset terminal 244a.

In addition, there is a determination step as a reset position, a mask step to prevent false signals at startup during feeding, and an AF step.
Wide angle range, about step of overheating point stop position when signal
Both telephoto ranges are set as the same step. Although different steps may be set in each range, setting a common step has the advantage that a common control circuit can be used.

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

When switching from the wide-angle area to the telephoto area, when the optical system switching instruction switch 254 is turned on for switching, the NAND gate 25, which is fixed at H by the resistor 255, is turned on.
One side input of 6 becomes L, and NAND gate 256 and NAND gate 25 constitute an R-S flip-flop.
7, the output of the NAND gate 25B is set to H and held. At this time, the D-flip-flop 259
The clock input becomes H at the output of the NAND gate 25B, and the state of the telephoto detection switch 25B 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 83e on the encoder, and is set to be turned on in the telephoto region T in this embodiment.

Therefore, in the wide-angle area W, the optical system switching instruction switch 25
4 is turned on, the telephoto detection switch 258 is off, so the output of the D-flip 70 knob 259 becomes H. This H signal causes the output of the AND gate 263 to go high, the NOR gate 231 goes high, and the OR gate 234 goes high.
As a result, the drive motor 12 rotates normally as described above. Switch 201.202.2 is activated by forward rotation of drive motor 12.
03 outputs steps 8 to 1, but goes beyond the movement area N and goes to step 8 in the telephoto area T.
When the output of the terminal 212a of the decoder 204 is output as H, one side input of the NAND gate 257 becomes L through the NAND gate 281, and the NAND gate 25G
The output is set to the L heli, and the drive motor 12 is stopped.

Here, the NAND gate 261 is controlled by the delay circuit 28G, which means that after setting a certain time delay from the start of normal rotation of the drive motor 12, the terminal 212a
This means that the information on the NAND game (NAND game) is transmitted in 257 tables.
This prevents the ND gate 25B from being reset on the spot.

When switching from telephoto area T to wide-angle area W.

When the optical system changeover instruction switch 254 is turned on, the output of the D-flip-flop 259 becomes L because the telephoto detection switch 258 is turned on. Therefore, the output of the AND gate 263 becomes L, and the output of the AND gate 263 becomes H via the inverter 262.

This drives the drive motor 12 in the reverse direction. Since stopping is the same as in the case of normal rotation, the explanation will be omitted.

According to this embodiment, the wide-angle area a, the transition area d, the waiting castle e,
Since each cam surface in the telephoto region is integrally formed on the cam plate 71 made of synthetic resin, manufacturing and assembly are simplified.

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

Since the wide-angle area a and the telephoto area of the cam plate 71 are integrally molded, the relative positions of the two head areas cannot be changed, so the back adjustment in the telephoto area is done by adjusting the air flow between the main optical system 3 and the sub optical system 4. This can be done by adjusting the interval.

In the above embodiment, during automatic focus adjustment prior to photographing, the photographing optical system was extended from t to a position where it focused on a subject at infinity to a position where it focused on a nearby subject. However, it can also be applied to structures that are renormalized in the opposite direction.

Furthermore, in the above embodiments, the photographic optical system has two types of focal lengths, wide-angle and telephoto, but the present invention is not limited to this, but can also be applied to a configuration in which the photographic optical system can be switched to three or more types. It is.

"Effects of the Invention" According to the focal length switching type camera according to the present invention, the electric detection means that moves synchronously according to the amount of movement of the photographic optical system continuously detects the position corresponding to each range of the photographic optical system. Since the possible detection area is provided, the operating position of the photographing optical system can be detected accurately and reliably over the entire area, and there is no need to provide a mechanical stop means or special am means for switching the photographing area. It is extremely effective because it simplifies and reduces costs, and the position information can be used in various mechanisms such as flashmatic control.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a pattern layout diagram showing the detection area of the encoder, Fig. 2 is a perspective view schematically showing the internal mechanism of the camera, and Fig. 3 is the camera. 4 and 5 are plan views of the camera, FIG. 6 is a vertical sectional view of the camera, and FIG. 7 is a horizontal sectional view of the camera. Figures 8 and 9 are detailed sectional views of the main parts of the sub-optical system insertion/removal mechanism, Figure 10 is also a detailed sectional view of the main parts, and Figures 11 and 12 are block diagrams linked to the sub-optical system insertion/removal mechanism. A front view of the mechanism, FIG. 13 is a plan view of the automatic focus adjustment mechanism, FIG. 14 is a vertical sectional view, FIGS. 15 and 16 are plan views of the finder optical system switching mechanism, and FIGS. 17 and 18. is a plan view of the vicinity of the cam plate, Fig. 19 is a motor control circuit diagram for driving the optical system, Fig. 20 is a logic circuit diagram that controls the operation of the motor control circuit, Fig. 21 is a cam diagram, and Fig. 22 H is a diagram. A diagram showing the relationship between the diameter of the circle of confusion and the depth of field. FIG. 23 is a detailed control circuit diagram. l...Camera body 1a...Finder storage section 3...Main optical system 4...Sub-optical system lO・
...Bed 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...Printed circuit board for encoder Fig. 1 Fig. 3 Fig. 4 Fig. J Fig. 6 Fig. 11 Fig. 12 Fig. Nl'7 Fig.

Claims (1)

[Claims] (1) In a focal length switchable camera in which the photographing optical system is switchable between at least first and second focal lengths, the photographing optical system includes first lenses arranged at intervals in the optical axis direction.
, a first focal length area that is a first movement range narrowed by the second, third, and fourth points, a transition area for focal length switching that is a second movement range, and a third movement range. is supported so as to be able to reciprocate in each region of the second focal length region, and moves the first focal length region from the first point toward the second point while exhibiting the first focal length. adjusting the focus, moving the focal length switching region from the second point to the third point to switch from the first to the second focal length, and switching the focal length from the first to the second focal length;
moving back from the point to the second point to switch from the second to the first focal length, and moving the second focal length region back from the third point to the fourth point to switch the focal length from the second point to the fourth point. An electric drive means is provided for driving the photographing optical system so as to perform focus adjustment while exhibiting two focal lengths, an electric detecting means is provided which moves synchronously according to the amount of movement of the photographing optical system, and the electric detecting means , a focal length switching type, characterized in that the electric detection means is provided with first to third detection areas that can continuously detect positions corresponding to the first to third movement ranges of the photographic optical system. camera.