JP2769606B2 - Position detection device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the displacement of an optical system and the related art.
The position of the optical system is detected to perform
The present invention relates to a position detecting device that emits light. 2. Description of the Related Art Conventionally, a configuration for detecting a displacement of a photographing optical system is described.
As sliding contact with the encoder pattern arranged on the arc
There is a configuration having an encoder brush that performs the operation. Enko
Doubrush is used to determine the encoder pattern according to the displacement of the optical system.
Relative rotation with respect to the
, The displacement of the photographing optical system is detected. Ma
Also, an encoder extending parallel to the optical axis direction of the photographing optical system
Some position detecting devices have a pattern. [0005] The displacement of the photographing optical system is
The control performed continuously includes the position of the high-precision imaging optical system.
Controls that require information and high-precision shooting optical system positions
Does not require much information, that is, some accuracy errors
There are acceptable controls. However, conventional shooting light
In the configuration to detect the displacement of the science system, each control is necessary.
Does not take into account differences in the accuracy of
The control that requires the position information of the high-precision
A control system that does not require much positional information
Control was performed using information of a certain degree of accuracy. others
High accuracy using the position information detected with high accuracy.
Performing control that does not require much positional information creates waste
Or high-precision position using not so high position information
Inconvenience that error is increased by performing control that requires information
There is a problem that a combination occurs. The present invention focuses on such a conventional problem.
This is done by changing the shooting range
Precise and precise regulation of moving area for dynamic focus adjustment
The purpose of the present invention is to provide a position detecting device
doing. [0006] To achieve the above object,
The gist of the present invention is that a predetermined point on a circuit board is
And a signal pattern arranged on an arc centered at
Generates a signal according to the relative displacement with the signal pattern on the arc
Signal generating means for detecting the position of the optical system from a change in the signal.
In a position detecting device for detecting information on the position,
The signal pattern is located at the position of the optical system to control the shooting conditions.
A first signal pattern for providing information about the light;
Information on the position of the optical system for stop control of the science system
And a second signal pattern for providing
Fixed in a state, and the circuit board is centered on the predetermined point.
When the circuit board is rotatable in a predetermined rotation position,
With a third signal pattern for detecting that
At least one of the first and second signal patterns.
While being arranged on the first arc centered on the predetermined point,
A half larger than the first arc centered on the predetermined point
The second or third signal pattern on a second arc having a diameter.
Characterized in that at least one of the
Present in the detection device. However, the signal pattern on the first arc is
High accuracy in controlling shooting conditions in response to changes in signal
Control that does not require much positional information of the optical system of
Obtain more accurate information than the signal pattern on the first arc
According to the signal change due to the second arc-shaped signal pattern
Control of the optical system, or between the optical system and the circuit board.
High-precision optical system position information called reference position determination is required.
Perform necessary control. Therefore, a highly accurate location
Control that requires high-precision position information
And do not require much accurate location information.
Large space on the circuit board is required for
Eliminates the need for efficient use of space on the circuit board
it can. An embodiment of the present invention will be described below with reference to the drawings.
I do. As shown in FIG. 3 to FIG.
On the front side, a dustproof cover 2 is provided in the left-right direction in FIGS.
The main optical system 3 constituting the shadow optical system is moved in the direction of its optical axis (FIGS.
(Vertical direction in FIG. 5).
It is provided so that it can be inserted. Inside the camera body 1
A sub-optical system 4 that constitutes a photographing optical system together with the main optical system 3 includes:
The position inserted into the light beam of the main optical system 3, that is, the photographing light beam,
Crosses the optical axis of the main optical system 3 between the position retracted from the light beam
(In the horizontal direction in FIGS. 3 to 5).
ing. On the upper surface of the camera body 1 is a focal point of a photographing optical system.
Constant operation of focal length selection member 5 for switching distance
It is provided as possible. In FIG. 3, the dust cover 2 is in the open position.
You. The focal length selection member 5 sets the focal length of the main optical system 3 to telephoto.
At the telephoto position where the
Character "T". Main optical system 3 is dustproof
At the extended position protruding from the front surface of the cover 2, the insertion position
And the sub-optical system 4 in
It is point distance. In FIG. 4, the dust cover 2 is in the open position.
You. The focal length selecting member 5 widens the focal length of the main optical system 3
The camera is located at the wide-angle position
Character "W". At this time, the main optical system 3
Is the retracted position of the camera body 1 from the extended position
And the sub optical system 4 is at 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.
Thus, the main optical system 3 is covered. At this time, the main optical system 3
Means that although the focal length selection member 5 is in the telephoto position,
The sub optical system 4 is at the retracted position. Prevention
When the dust cover 2 is in this closed position, photographing is not possible.
Dustproof cover to make the
The indicator 2a attached to the upper surface of the bar 2 is the upper surface of the camera body 1.
Is opposite to the character "OFF". As can be seen in FIG.
Is the switch SW1 linked to the dust cover 2 and the focal length selection.
A switch SW2 that is linked to the selection member 5 is provided. The switch SW1 is fixed to the dustproof cover 2.
Sliding section 2b and conductor land 2c fixed to camera body 1
ON when the dust cover 2 is in the open position.
Off from the open position to the closed position.
You. This switch SW1 is used to displace the main optical system 3, which will be described later.
In addition to controlling the rotation direction of the motor 12, a
The power supply to the data control circuit 31 is controlled. The switch SW2 is fixed to the focal length selection member 5.
The sliding section 5a attached and the conductor rail fixed to the camera body 1
5b, depending on the position of the focal length selection member 5.
The rotation of the motor 12 to be switched and displaces the main optical system 3 will be described later.
Control the turning direction. Switch SW2 is a focal length selection member
ON when 5 is in the telephoto position and when in the wide-angle position
It turns off. The upper part of the camera body 1 has a positive refractive power.
First finder optical system 6 and second fine having negative refractive power
Inverse Galilean finder optical system including
The finder is accommodated in the finder housing 1a. The finder optical system as a whole has a wide front.
The back is narrow and narrow, and the viewfinder
A substantially trapezoidal space adjacent to the constricted part of the indah optical system
Is formed. Also, there are two optical systems located on both sides of the finder optical system.
Are AF (automatic focus adjustment) optical systems 8a and 8b,
A light projecting element 8c is provided after the optical system 8a,
Later, a light receiving element 8d is provided. FIG. 2 shows the displacement mechanism of the main optical system according to the present embodiment.
FIG. 2 is a perspective view showing a viewfinder switching mechanism and other internal mechanisms.
is there. An opening through which the photographing light beam passes is located at the center of the base plate 10.
An opening 10a is provided, and the main optical system 3 is mounted in front of the opening 10a.
After that, the aperture and shutter device indicated by the imaginary line was
11 is mounted. From the aperture and shutter device 11
FPC (flexible printed circuit board) for transmitting control signals
The FPC 11a has been extended. A motor 12 is fixed on the upper back surface of the base plate 10.
A bevel gear 12a is fixed to one end of the rotating shaft.
Have been. The bevel gear 12a is supported by the base plate 10.
The gear 13 meshes with the spur gear integrated with the gear 13
Ya 14 is engaged. The gear 14 is provided on a support
The arm can rotate, but cannot move in the axial direction.
Noh is held. A through hole is formed in the center of the gear 14.
In this through hole, a lens centered on the rotation center of the gear 14
The edge has been cut. This female thread has a guide shaft 15
The male screw is screwed. The guide shaft 15 extends in the direction of the optical axis.
0, the end fits the board 1c of the camera body 1
It is fixed so that it cannot rotate with the set screw 15a.
Side slides axially into through hole 10b (shown in FIG. 10) of base plate 10.
The tip is inserted into the camera body 1
You. A guide shaft 16 extending in the optical axis direction is also mounted on the substrate 1c.
Has been established. Guide shaft 16 is axially aligned with notch 10c of base plate 10.
It is slidably fitted. A linear cam plate 17 is provided on the base plate 10.
Along the moving direction (the optical axis direction of the main optical system 3).
The linear motion cam plate 17 has a spring property,
A sliding contact portion 17a is formed at the tip, and the sliding contact portion 17a is
A fixed wall (unfitted) extending from the plate 1c in the direction of movement of the base plate 10
(Shown) is slidably pressed. With this configuration, the motor 12 rotates.
Then, the base plate 10 is moved toward the optical axis by the screwing of the gear 14 and the guide shaft 15.
The main optical system 3, which is fixed to the
The shutter device 11 has an optical axis between the extension position and the extension position.
Displace in the direction. At this time, the guide shaft 16 and the notch 10c
Allows the base plate 10 to rotate in a plane orthogonal to the optical axis.
Is prevented. The fixed wall surface of the sliding portion 17a of the cam plate 17
Guide shaft 16 and notch 10c contact without backlash
The Rukoto. Therefore, the base plate 10 deviates the optical axis of the main optical system 3.
The optical axis is kept perpendicular to the optical axis without centering
Translate in the direction. On the back side of the base plate 10, a reduction gear train 25 and a cam gear
26 and a driving member 27 are pivotally supported.
The optical system 4 is screwed and held via a support cylinder 4e.
The input gear 25a of the reduction gear train 25 is
The last gear 25b of the reduction gear train 25 meshes with the spur gear.
Is engaged with the cam gear 26. The cam gear 26 and the driving member 27 are coaxial.
And a front cam 26a provided on an end face of the cam gear 26.
Are coupled through. The reduction ratio of the reduction gear train 25 is set as follows.
Have been. That is, when the main optical system 3 is at the extension position
Is an insertion position where the sub optical system 4 is inserted into the photographing light beam (FIG. 2).
And the main optical system 3 is in the retracted position.
At the time, the retracted position where the sub optical system 4 is retracted from the photographing light beam
(Shown by a solid line in FIG. 2). FIGS. 8 and 9 show details of the sub optical system insertion / removal mechanism.
FIG. In the figure, a base plate 10 in front of an opening 10a
The main optical system 3 and the aperture / shutter device 11 are fixed and open.
A positioning means 28 for the sub optical system 4 is formed behind the opening 10a.
Have been. The positioning means 28 is arranged so that the optical axis of the main optical system 3 is
Inner cylindrical surface 28a to be the center, horn-shaped guide surface 28b, main optical system 3
And an abutment surface 28c orthogonal to the optical axis. The positioning means 28 includes the sub optical system 4.
The holding cylinder 4a for physically holding can be engaged, and
The optical axis of the sub optical system 4 is the optical axis of the main optical system 3 at the extended position.
And the sub optical system 4 is positioned at a predetermined position in the optical axis direction.
It is positioned in. The alignment of the optical axis is performed by the front end face 4b of the holding cylinder 4a.
The small cylinder 4c protruding from it is inserted into the inner cylinder surface 28a of the positioning means 28
The positioning in the optical axis direction is
The end surface 4b of 4a comes into contact with the contact surface 28c of the positioning means 28.
And by The driving member 27 includes a fixed shaft implanted on the base plate 10.
10g, the bearing is slidable in the axial direction via the bearing 27a.
Have been. The sub optical system 4 is accommodated in the driving member 27 in a loosely fitted state.
A circumferential groove 27b is formed. The outer circumference of the holding cylinder 4a of the sub-optical system 4 has an entire circumference.
A flange 4d is provided, between the inner circumferential groove 27b and the flange 4d.
, A coil spring 29 is inserted. This spring 29
The auxiliary optical system 4 brought to the insertion position is
Acts to bias in the direction of contact. A cam gear 26 is also supported on the shaft 10g.
The front cam 26a formed on this end face has one part of the drive member 27.
The sliding contact portion 27c provided at the end can slide. On shaft 10g
The flanges 10h and 10i are fixed so as to sandwich the bearing 27a.
The spring 30 is inserted between the collar 10h and the driving member 27.
I have. The spring 30 connects the sliding contact portion 27c of the driving member 27 to the cam 26a.
Or press the front end face of the bearing 27a against the flange 10i.
Work to discipline. The free end 27d of the driving member 27 is locked to the base plate 10.
Locking members 10j and 10k are implanted, and the locking members 10j
Is the driving member 27 when the sub optical system 4 is brought to the insertion position.
Of the sub optical system 4 is in the retracted position.
Locks the swinging of the drive member 27 when it is brought to the position. In the vicinity of the end of the locking member 10k,
The small cylinder 4c of the sub optical system 4 brought into the
A circular hole 10l is provided. FIG. 8 shows that the sub optical system 4 is at the insertion position,
And at the fully inserted position engaged with the positioning means 28.
The state is shown. The sub-optical system 4 has the following other positions.
Take. That is, although it is in the insertion position, the front cam
26a so that it does not engage with the positioning means 28.
Although it is located at the complete insertion position and on the circular hole 10l, its small cylinder 4c is
It is pushed up by the surface cam 26a and does not fall into the circular hole 10l.
Incomplete evacuation position, complete with small cylinder 4c dropped into circular hole 10l
It is a retracted position (shown in FIG. 9). FIGS. 11 and 12 show the auxiliary optical system insertion / removal mechanism.
FIG. 9 shows a front view of a sub-optical system reverse movement prevention mechanism linked to
You. Fixed to a blocking gear 30f that meshes with the cam gear 26.
The blocking plate 30a is connected to the first small-diameter portion 30b which is sequentially connected.
The first engagement surface 30c, the second small diameter portion 30d, and the second engagement surface 30
e. The first engagement surface 30c and the second engagement surface 30
e is provided near the bearing 27a of the drive member 27, respectively.
Can be engaged with the engaging portion 27e. FIG. 11 shows that the sub optical system 4 is in the completely retracted position.
FIG. 12 shows a state where it is locked at the incomplete retreat position, and FIG.
Is locked in the fully inserted position or incompletely inserted position.
It shows a state in which FIG. 21 shows a cam diagram of the cam 26a.
You. The cam 26a has a lift from 0 to Θ1.
From the first flat section A, which does not change at 0, to Θ1 to Θ2
The first slope section where the head h increases linearly from 0 to h1
B, the head h does not change at h1 from Θ2 to Θ3
2 Flat section C and head h is h1 from {3 to 360}
And a second slope section D linearly decreasing from 0 to 0. The cam 26a has three functions with respect to the sub optical system 4.
Use The first is that the sub optical system 4 is incompletely inserted and incompletely inserted.
Operation for displacing in the optical axis direction of the main optical system 3 with respect to the insertion position
It is for. Second, the sub-optical system 4 is positioned at an incomplete insertion position and an incomplete position.
The position changes in the direction crossing the optical axis of the main optical system 3 between all the retracted positions.
This is the function of positioning. Third, the incomplete evacuation of the sub optical system 4
Between the position and the completely retracted position in the optical axis direction of the main optical system 3.
This is the function of positioning. Details will be described later. As shown in FIG. 2, a rack is
51 are erected. With the base end implanted on the substrate 1c
The guide shaft 51a with the front part loosely fitted to the base plate 10
Has been inside. The rack teeth 51b engraved on the rack 51 include:
The pinion 52a fixed to the lower end of the transmission shaft 52 engages
The transmission shaft 52 is composed of a photographing optical system, a finder optical system,
Penetrates a partition plate (not shown) that blocks light from the academic system etc.
doing. A spur gear 52b fixed to the upper end of the transmission shaft 52
Is engaged with the reduction gear 53a, and the shaft 50 of the gear 53a is
A cam member 53 as a control member is pivotally supported at the upper end. A cam plate 71 is fixed to the cam member 53.
(See FIGS. 13 and 14). The cam plate 71 is provided with a cam plate to be described later.
Active triangulation with automatic focus adjustment after the lever 73
Connection between the joint (hereinafter referred to as AF) device and the photographing optical systems 3 and 4
Take action. The upper surface of the cam plate 71 is a printed circuit board described later.
A detection brush plate 61 that comes into sliding contact with 62 is planted. The bra
The plate 61 is composed of four conductors formed of the same conductor and electrically connected to each other.
It has brushes 61a, 61b, 61c, 61d. On the reduction gear 53a, a fixing column 50a is provided upright.
And is inserted into the adjustment slot 71a formed in the cam plate 71.
The screw 71b is screwed into the upper end of the fixing post 50a,
The plate 71 and the cam member 53 are integrally combined with the reduction gear 53a.
Have been forgotten. Backlash is reduced by the reduction gear 53a.
Gear 50b is engaged with the gear 50b, and the gear 50b is
It is urged in the more clockwise direction (the direction of the arrow).
As a result, the reduction gear 53a is also urged to move between the gears 53a and 52b.
And the backlash between gear 52a and rack 51b
It is suppressed. An encoder print is provided above the cam plate 71.
A substrate 62 is provided. The printed circuit board 62 is a cam member 53
The central part is locked to the pivot 50 of the
Is provided, and a screwing emboss formed with the camera body 1 is provided.
The position is adjusted and fixed by the set screw 62b
ing. On the lower surface of the printed circuit board 62, as shown in FIG.
A plurality of putters for sliding contact in a concentric shape centering on the pivot 50
63 is provided. The sliding contact pattern 63 is formed from the inner circumference to the grounding second pattern.
The first pattern 63a, the second pattern 63b for photographing, and the third pattern
Turn 63c, fourth pattern 63d, and fifth pattern 63e are arranged.
Is placed. The photographing optical system supported by the base plate 10 is
The wide-angle area, which is the first movement range, and the transition, which is the second movement range
Area and a telephoto area which is a third moving range.
And the sliding pattern 63 as a whole
The wide-angle area W, which is an area, and the transition area N, which is a second area.
And a telephoto area T which is a third area.
You. The fifth pattern 63e is for discriminating a region.
The second pattern 63b and the fourth pattern
Nested between turns 63d or third pattern 63c
It is arranged in a state. Ends connected to each pattern 63a to 63e
Subs 64a to 64e are provided at the end of the printed circuit board 62. The fourth pattern 63d and the fifth pattern 63e
The photographic optical system and the sliding contact
Reference position adjustment pattern that determines the positional relationship with turn 63
63f is provided. Reference position adjustment pattern 63f
Has a width corresponding to the required positioning accuracy.
Adjustment terminal connected to the reference position adjustment pattern 63f
64f is provided at the end of the printed circuit board 62. Each putter
Brushes 61a, 61b, 61c, 61d of the brush plate 61
Are in contact with each other. The photographing optical systems 3 and 4 are located at infinity in a wide-angle region.
To travel the entire distance from
The brushes 61a, 61b, 61c, 61d move around the pivot 50.
Rotates at an angle of 360 degrees or less. Each brush 61a, 61b, 61c,
Depending on the position where 61d touches, that is, the position of the shooting optical system
Of each electrical signal output from each of the patterns 63a to 63e.
The numbers change digitally. Decode each of these electrical signals
The photographing optics indicating the positions of the photographing optical systems 3 and 4
A system position signal is obtained. In addition, this photographing optical system position signal
ON / OFF of switches SW3, SW4, and SW5 described later are controlled by
It is. That is, each of the brushes 61a, 61b, 61c, 61d is
When it comes into contact with each corresponding pattern,
Circuit not shown emits low signal, deviates from pattern
When the brush touches the insulation, it will emit a high signal.
The output from the pattern 63b is code A,
Code B from pattern 63d and code B from pattern 63c
Code C outputs, the combination of these code outputs
It is possible to obtain various step outputs as shown in the following table.
Wear. [Table 1] Then, in either the wide-angle area W or the telephoto area T,
Even in this case, the switching point in steps 8 and 7 is the distance measurement of the photographing optical system.
At the reset position, which is the starting point of
This corresponds to the telephoto point a or the telephoto infinity point f. Steps 7 to 6 are switching points where no signal is stopped
And infinite for active auto focus
When trying to shoot a distant position, the reflected light from the
Optics at the no-signal stop position
This is to stop the system and try to take a picture. Steps 6-1 are performed when the strobe is used.
Control the shooting conditions with the aperture while keeping the flash output constant
Gives position information to so-called flashmatic control
It is for The switching point in steps 2-1 is the shortest distance stop
This is the stop position, and the shooting optical system extended from the telephoto position is
To stop it from running away. Wide angle
In the area W, steps 8 to 1
In the telephoto region T, which is arranged clockwise, step 8
To step 2 and step 1 is omitted
The switching point in steps 3 and 2 is stopped at the shortest distance
Stop position. Each of the patterns 63a to 63e has the required
The higher the accuracy is required in accordance with the accuracy
Is placed. The amount of movement for the angular displacement is larger on the outer circumference
The reason is that the detection can be performed with such high accuracy. That is, the pattern 63a is a ground pattern
Only if brush 61d of brush plate 61 is in sliding contact
Pattern 63b is used only for flashmatic control
It does not require much positional accuracy. Against this
And the pattern 63d outputs the switching points of steps 7 to 6.
By the way, at a long distance, the focus position is small
Location is greatly affected. What it is like,
Extending the taking lens with the confusion circle diameter on the vertical axis and distance on the horizontal axis
Referring to FIG. 22, which illustrates the depth of field in the amount of movement,
In the figure, δ indicates the permissible circle of confusion, and
Depth of field in case of permissible circle of confusion δ
It is. A is 5m when the feed amount is in focus at 10m
Focusing is possible up to ∞, and a and c are a little farther
In the case of the feeding amount that is focused on the distance,
∞ indicates that focus is achieved in the range of 8 m to ∞. Then, from the state of a to the state of b,
Lens movement is very small when the
It is assumed that the automatic focus adjustment control circuit is
The operable range, that is, the range where focus is achieved up to 5m
Assuming that the no-signal stop position is the position of A,
The pattern of the stop signal is slightly shifted, like
Focus range, subject is 5-6m or 5-8m
If there is between, there will be no focus at all
It will be. The pattern 63c is also a short distance stop signal.
And a reset signal are output, so high accuracy is required. Pa
Adjusting the reference position also determines the overall accuracy of turn 63f.
Therefore, higher precision is required. So this
Patterns requiring high precision are arranged on the outer periphery. The switch SW3 is set when the main optical system 3 is in the retracted position.
Switch SW4 is in the extended position, switch SW5
Is OFF when it is located between the feeding position and the feeding position.
You. Switches SW3 and SW4 work as limit switches,
The main optical system 3 is displaced to the retracted position or extended position.
And the power supply to the motor 12 is cut off. The switch SW5 is used when the main optical system 3 is in the above-mentioned two positions.
In the middle of the
Prevent shutter release when possible
And a shutter control circuit 31 described later.
(Shown in FIG. 9). In FIG. 15 and FIG.
Is the control member of the viewfinder switching mechanism,
A cam groove 54 is engraved, and the starting teeth 53b and the starting teeth 53b
Continuous drive teeth 53c and sliding edges 53d are formed without one tooth.
Have been. The switching drive member 55 swings close to the cam member 53.
Provided pivotally supported by the viewfinder housing 1a via the drive shaft 55a
Have been. The switching drive member 55 is provided with a starting tooth 53 of the cam member 53.
b, having a starting tooth 55b and a driving tooth 55c corresponding to the driving tooth 53c
The sector 55d and the substantially radial direction formed around the swing shaft 55a
And the second cam surface 55 which is a circumferential surface.
f and a cam shaft 55g extending radially from the swing shaft 55a.
And a swung arm 55h. Then, upward from the tip of the swing arm 55h
A first pair of positive refractive power is provided at the tip of the extended support arm 55i.
The object lens 56 is fixed, and the first objective lens 56 is
It has a finder optical system. The switching drive member 55 projects from the finder housing section 1a.
FIG. 15 shows a spring 55j stretched between the
Are biased clockwise. The second finder optical system has a negative refractive power.
(2) The objective lens 57 is attached to the linear holder 58 via the swing shaft 57a.
Swingably pivoted, the linear holder 58 holds the viewfinder
It is supported so that it can move straight in the optical axis direction of the finder optical path in the section 1a.
Is held. The lower end surface of the second objective lens 57 extends downward.
An engagement rod 57c is protruded, and the tip of the engagement rod 57c is
Is engaged with the cam portion 55g. The rack 51, the transmission shaft 5
2, the cam member 53, the switching drive member 55, the engagement rod 57c, etc.
The second finder optical system driving means is constituted. On the other hand, the rack 51, the transmission shaft 52, the cam member 53,
The switching drive member 55 and the like constitute the first finder optical system drive means.
Has formed. The cam groove 54 of the cam member 53 has a variable-magnification swing lever.
The driven pin 59a protruding from the gear 59 is engaged. Shaking
The moving lever 59 has a base end pivotally supported on the main body 1 via a pivot 59b.
And a pin 59c protruding from the end extending from the pivot 59b
The variable-magnification swing lever 59 is desired between the pin 1b fixed to the body 1
A toggle spring 59d that holds the remote position and the wide angle position is stretched.
Have been. The cam groove 54 of the cam member 53 is provided with a driven pin 59a.
Move the first circumferential groove 54a that is not operated and the driven pin 59a.
Drive groove 54b for swinging the variable-magnification swing lever 59,
The second circumferential groove 54c does not operate the pin 59a.
Have been. At the tip of the variable-magnification swing lever 59, a substantially U-shaped
A split groove 59e is formed.
Extending downward from the linear motion connecting arm 58d
The distal end of the provided vertical rod 58e is engaged. FIG. 2, FIG. 13, FIG. 14, FIG. 17, and FIG.
Denotes an AF switching device. That is, the outer periphery of the cam plate 71 is made of synthetic resin.
The cam surface is formed by integral molding
From the wide-angle infinity point a as shown in FIGS.
Wide-angle area c up to wide-angle closest point b, transition area d, and standby area
e and the telephoto area from the telephoto infinity point f to the telephoto closest point g
and h are continuously formed. Focusing operation in wide-angle area c
Focusing operation between the wide-angle infinity point a, which is the starting point, and the telephoto area h
Of the light emitting element 8c corresponding to the telephoto infinity point f which is the starting point.
The directions are set to be the same,
The near point b and the telephoto closest point g are the same due to the difference in the photographing limit distance.
Not be. Further, in this embodiment, when the sub optical system 4 is inserted,
Since it moves in the direction of the optical axis integrally with the main optical system 3, a wide-angle region
Although the cam shapes of c and the telephoto area h are not the same,
The optical system 4 does not displace in the direction of the optical axis, only
In an imaging optical system in which only the system 3 is displaced in the optical axis direction, the closest point
The cam shape becomes the same except for the vicinity. As shown in FIG. 2 and FIG.
The driven end 73a of the cam lever 73 pivotally supported by the camera body 1 is
The driven end 73a is in sliding contact with this cam surface and the cam lever 73
Is always pressed against the cam surface by a spring 73b for urging the
I have. An engaging pin 73c is fixed to the other end of the cam lever 73.
The engagement pin 73c is connected to the camera body 1 via the pivot 74.
Engaged with the engaging arm 75a of the interlocking lever 75
I have. The light emitting element holding lever 76 pivots concentrically with the interlocking lever 75.
It is pivoted via a shaft 74. The interlocking lever 75 is a spring 75 wound around a pivot 74.
b biases counterclockwise when viewed from above, thereby
The engagement arm 75a comes into contact with the engagement pin 73c of the cam lever 73.
Have been. The biasing force of the spring 75b is larger than the biasing force of the spring 73b.
The driven end 73a is separated from the cam surface of the cam plate 71
It will not be. The end of the interlocking lever 75 has an eccentric pin 75 for adjustment.
c, and the top 75d of the adjusting eccentric pin 75c is
The child holding lever 76 is inserted through an elongated hole 76a at the end. Interlocking
Engagement arm 75a of lever 75 and end of light emitting element holding lever 76
A tension spring 76b is stretched between these parts. The linkage lever 75 and the light emitting element holding lever 76
It operates almost integrally, and the light emitting element holding lever
The light emitting element 8c is held at 76, and as a whole, as shown in FIG.
Abuts against the end surface of the bearing portion of the camera body 1 by the spring 76c.
As shown in FIG.
ing. FIG. 2 further shows the switching of the distance display in the viewfinder.
The mechanism is shown. That is, the driven lever 82 is
It is pivotally supported by the camera body 1 and is fixed to one end of the driven lever 82.
The driven pin 82a is inserted into the cam groove formed in the linear motion cam plate 17.
17b is engaged. The slide lever is connected to the driven lever 82
-83 is connected to pins 84a and 84b
Through the guide holes 83a and 83b formed in the guide lever 83.
It is slidably supported in the direction. An engagement pin 83c is provided at one end of the slide lever 83.
Is fixed, and the engagement pin 83c is formed at the other end of the driven lever 82.
Engaged with the fork portion 82b. The slide lever 83 has a viewfinder optical system.
Located in front of the fixed lens 7a
Guides 83d and 83e that appear selectively in the system. FIG. 19 drives the optical systems 3 and 4 of the present embodiment.
2 shows a motor control circuit for the same. In the figure, the motor 12 has three power supply circuits.
Driven by The first path is the positive switch of power source E-switch SW
3-switch SW7a-motor 12-switch SW7b-power supply E
This is the path of the negative electrode. Power is supplied through this route.
The motor 12 rotates and the main optical system 3 is displaced to the retracted position.
And the sub optical system 4 is displaced to the retracted position. The second path is the positive switch of power source E-switch SW
4-switch SW8a-motor 12-switch SW8b-power supply E
This is the path of the negative electrode. Power is supplied through this route.
The motor 12 rotates in the opposite direction to that in the first path,
The main optical system 3 is displaced to the extended position and the sub optical system 4 is moved.
Displace to the insertion position. Here, the switches SW7a, SW7b, SW8a, and SW8b are
Opening / closing is controlled by a logic circuit 40 (shown in FIG. 20) described later.
Semiconductor switch. The third path is automatic focus adjustment and shutter
This is a path connecting the control circuit 31 and the motor 12,
The output of the circuit 31 causes the motor 12 to rotate forward and reverse, and
Move it back and forth in the axial direction to match the focus. The power supply line of the control circuit 31 is connected in series.
The inserted switches SW1a and SW5 are inserted. Switch SW
1a is controlled by the switch SW1 and is in phase with
A dustproof cover 2 which is opened and closed by
ON only when in the open position. Switch SW5 is the main optical system
3 is in the extended position and the extended position (when the sub optical system 4 is completely
ON only at the insertion position and the complete retreat position). This
Due to these, the dust cover 2 and the optical systems 3 and 4 are not suitable for photography.
Automatic focus adjustment and shutter operation when in position.
And is prevented. FIG. 20 shows the operation of the motor control circuit shown in FIG.
Is shown in FIG. This logic circuit 40
Are a pair of input terminals 40a, 40b and a pair of output terminals 40c, 40d
And Input terminal 40a is connected to switch SW1
Between ground resistance, input terminal 40b is connected to switch SW2 and ground.
Between the resistors, the output terminal 40c is connected to the switches SW7a and SW7b.
The control terminal and output terminal 40d are connected to the switches SW8a and 8b.
Control terminals. When the switch SW1 is ON, the input terminal 40a
That is, when the dust cover 2 is in the open position, the high level is set.
When switch SW1 is OFF, that is, when dust cover 2
Is at the Low level when is in the closed position. Input terminal 40b
Is when the switch SW2 is ON, that is, the focal length selection member
When 5 is in the telephoto position, it becomes High level and switch SW
2 is OFF, that is, the focal length selection member 5 is in the wide angle position
Is at the Low level when it is at When the output terminal 40c is at the high level,
Switches SW7a and SW7b are both ON, and both are OFF when the level is low.
To When the output terminal 40d is at the high level,
Turn on both SW8a and SW8b, and turn off both when Low level.
You. The input terminal 40a of the logic circuit 40
One input terminal of the negative OR circuit 40e and the input terminal of the NOR circuit 40f.
It is connected to one input terminal. The input terminal 40b is
The other input terminal of the exclusive OR circuit 40e and the NOR
It is connected to the other input terminal of the circuit 40f. The output terminals of both circuits 40e and 40f are connected to the OR circuit 40.
g are connected to both input terminals. OR circuit 40
g is connected to the output terminal 40c of the logic circuit 40
Connected to the input terminal of the inverter 40h and the output of the inverter 40h
The terminal is connected to the output terminal 40d of the logic circuit 40. The following table shows the position of the dust cover 2 and the focal length.
The position of the selection member 5, which switches according to these positions,
State of switches SW1 and SW2, input terminals 40a and 40 of logic circuit 40
b, level of output terminals 40c, 40d, switches SW7a, SW7b, SW8
a, Relationship of SW8b status, position of main optical system 3 and sub optical system 4
Are summarized. [Table 2] FIG. 23 shows the specific control of the camera according to this embodiment.
It shows a control circuit diagram. This control circuit diagram shows the output of the encoder
Decoder that decodes and outputs the position information of the photographing optical system
204, focus detection unit 270, drive unit 280, switching unit 290
And Decoder 204 is the output of the encoder
Switches corresponding to code A, code B, and code C
Signals from the switches 201, 202, and 203, respectively, to the input terminals 201a to 203a.
Combined AND gates 205-212 and inverter
213 to 224 and output terminals 205a to 212a.
The force is also connected to the aperture control circuit 225. The focus detection section 270 sends a signal to the focus detection circuit 240.
When the light emitting LED 243 is connected via the transistor 242,
In both cases, the light receiving element 241 is connected,
Is a PNP transistor for switching the drive motor 12.
235,236 and NPN transistors 237,238
NOR gate 231,233, OR gate for transistor control
232, 234, and the switching unit 290 includes a D-flip flip
RS 259, and an R-S comprising NAND gates 256 and 257.
A flip-flop and a delay circuit 260;
The D input terminal of the flip-flop 259 is connected through a terminal 258a.
The telephoto detection switch 258 is connected and the delay circuit 260
The output is RS flip-flop through NAND gate 261.
Input to the NAND gate 257 of the
256 is connected to resistor 255 and optical system changeover switch 254
Have been. The signal of the telephoto detection switch 258 is
Is given by the pattern 63e of the
The focus detection circuit 240 of the detection unit 270 passes through an inverter 245.
OR gate 244, NAND gates 228 and 22
9 RS flip-flop, AND gate 230
Is connected to the drive section 280 via the. OR gate 244
Is connected to a reset terminal 244a. NAND game
The resistor 227 and the hand switch 226 are connected to the port 229.
Have been. The switching unit 290 includes an inverter 262 and an AND gate 26
It is connected to the drive unit 280 via 3,264. decoder
204 is input to A through an AND gate 247 and a NOR gate 246.
Input to the ND gate 230 and the terminal 212a
It is connected to a D gate 261 and an OR gate 244. Terminal 21
2a is the NAND gates 251, 252 via the inverter 253.
To the NAND gate 251 of the RS flip-flop
Connected to the NAND gate 252,
The switch 249 and the resistor 250 are connected. A camera with a focal length switchable type having the above configuration is
The adjustment performed when assembling will be described. This adjustment can be roughly divided into the following three.
Can be summarized. The photographing optical systems 3 and 4 are moved from a wide-angle region to a telephoto region.
The distance between the filming optical systems 3 and 4 and the film surface is set to a predetermined value so that the feeding amount necessary for switching to the range is adjusted to a predetermined value.
Between the adjusting photographing optical systems 3 and 4 and the cam member 53 driven by the adjusting photographing optical systems 3 and 4
An example of a specific procedure for adjusting the phase adjustment will be described below.
is there. I. Base plate 10 and main light attached to it
Parts such as the science system 3, the sub optical system 4, and the sub optical system
Knit and attach to a specified jig. This jig is
Guide for supporting the plate 10 so that it can be guided in the optical axis direction of the main optical system 3
Member and focus of main optical system 3 alone and composite optical systems 3 and 4
A collimator for inspecting the distance. II. The main optical system 3 alone constitutes the photographing optical system.
At a first predetermined distance (for example, infinity).
So that the subject is imaged on the surface equivalent to the film surface,
Positioned on the main optical system 3, that is, the base plate 10, while using a collimator
Adjust the position. Repeat the base plate 10 by a predetermined amount from the adjustment position of III.II.
And insert the sub optical system 4 behind the main optical system 3
To the telephoto state. The base plate 10 is extended by a predetermined amount. Soshi
Therefore, an object at a second predetermined distance (for example, infinity) is
Collimator so that the image is formed on the surface corresponding to the film surface.
Adjustment of air gap between main optical system 3 and sub optical system 4 while using
do. The auxiliary optical system 4 includes a support cylinder 4e screwed to the drive member 27.
Is rotated by rotating the support cylinder 4e.
The sub optical system 4 can be moved in the optical axis direction,
It is possible to adjust the air gap with the academic system 3. An example of a specific procedure for the adjustment will be described below.
It is as described. IV. Unit for which the above adjustments I to III have been completed
Is inserted into the camera and inserted into the optical path of the collimator. V. As shown by the solid line in FIG.
Configures a wide-angle shooting optical system with only a spur gear 52b and reduction
The engagement with the gear 53a is released, that is, the cam portion
The link between the material 53 and the photographing optical systems 3 and 4 is turned off. VI. The base plate 10 supplied with power to the motor 12 is
After the coarse adjustment, the power supply to the motor 12 is stopped. And
When the main optical system 3 is located at a third predetermined distance (for example, 2.4 m).
Use a collimator to image the object on the film surface
Fine adjustment of the position of the base plate 10 is performed. This is shown in FIG.
Loosen the set screw 15a shown in 10 and cut the guide shaft 15 into the slot 15c.
The guide shaft 15 by rotating the guide shaft 15
It is performed by As is apparent from FIG. 10, the guide shaft 15 itself
Cannot rotate in the axial direction, so it rotates relative to gear 14.
However, since the motor 12 is stopped, the gear 14 also does not rotate.
No. Therefore, the base plate 10 moves back and forth in the optical axis direction. Adjustment is completed
Then, the guide screw 15 is fixed by fastening the set screw 15a. An example of a specific procedure for the adjustment will be described below.
It is as described. VII. Next, the photographing optical systems 3 and 4 and the cam lever 7
Determine the positional relationship of the cam member 53 (cam plate 71) with respect to 3.
Make adjustments. When the above VI adjustment is completed, that is,
The main optical system 3 is used to film an object at a third predetermined distance on a film.
Spur gear 52b and reduction gear
The cam member 53 and the photographing optical systems 3 and 4 are engaged with each other.
And can be linked. As shown in FIG. 2, FIG. 13 and FIG.
Loosen the screw 71b and insert the cam member 53 (cam plate 71) into the slot 71.
so that it can rotate within the range of a. And shown in FIG.
As shown in the drawing, an index attached to the driven end 73a of the cam lever 73,
Face the index attached to the cam plate 71, and tighten the screw 71b.
You. The index of the cam plate 71 indicates that the subject is at the third predetermined distance.
When the autofocus device detects that there is
Position of the cam plate 71 with respect to
Is completed, the photographing optical systems 3 and 4 and the cam lever 73 are adjusted.
The position of the cam member 53 (cam plate 71) with respect to the above is determined. VIII. Next, an engine for the photographing optical systems 3 and 4
The position of the coder printed circuit board 62 is adjusted. First screw 62
b is loosened and the printed circuit board for encoder 62 is
It is possible to rotate around the axis 50 within the range of a. Soshi
The photographing optical systems 3 and 4 are located at the third predetermined distance.
When focused on the body, the encoder printed circuit board 62
Position the board 62 at the position to be taken and fasten the screws 62b
I do. The position that the substrate 62 should take is a third predetermined distance
Indicates that the shooting optical system is in focus on the subject at
The imaging optical system position signal is applied to each of the sliders provided on the lower surface of the substrate 62.
This is the position obtained from the contact pattern. The wide angle infinity point “a” of the cam plate 71 and the close distance are thus obtained.
At each point of point b, telephoto infinity point f and near point g, a cam lever
When the driven end 73a of the
Infinity in the state, close in the same state, infinity in the telephoto state, same state
Focus precisely on subjects at close distances
From the respective sliding contact patterns, the exact photographing optical system position
A signal is obtained. Next, the AF optical system is adjusted. Main optical system
The predetermined subject distance on the optical axis of No. 3 (for example, 2.4 m)
Place the sign plate at the position of
Incident on Then, the output of the light receiving element 8d is predetermined.
Rotate the eccentric pin 75c so that the
To adjust the direction of the light emitting element 8c. The wide-angle area c and the telephoto area h on the cam plate 71
Is the rotation angle corresponding to the first predetermined amount of feeding.
The cam surface of the cam plate 71 is
This means that all areas have been adjusted. Thus, each adjustment is completed. Next, the operation will be described. (1) As shown in FIG. 3, the dustproof cover 2
When the focal length selecting member 5 is at the telephoto position at the open position,
When the optical system 3 is already in the extended position, the switches SW1, SW2
Are both in the ON state, so that the input terminals 40a,
40b are both High level. Exclusive or times
The output terminals of the circuit 40e and the NOR circuit 40f become low level,
The output terminal of the circuit 40g also goes low. Logic circuit 40
Output terminals 40c and 40d are at the Low and High levels, respectively. As a result, the switches SW7a and SW7 shown in FIG.
b is turned off, and switches SW8a and SW8b are turned on. Chief light
Since system 3 is in the extended position, switches SW3, SW4, SW5
Are in the ON, OFF, and ON states, respectively. Switch SW7a, S
Since W7b is OFF, the first path is not formed, and
Since the switch SW4 is OFF, the second path is also formed.
Absent. In this case, the main optical system 3 is at the extended position,
The system 4 is completely engaged with the positioning means 28 as shown in FIG.
At the fully inserted position
A synthetic optical system is constructed, and the focal length is in the telephoto range.
become. Since both switches SW1a and SW5 are ON, auto focus
The point adjustment / shutter control circuit 31 is in an operable state,
Shooting with a telephoto optical system is possible. The finder optical system is also provided with a second objective lens.
As shown in FIG. 15 where the first objective lens 56 is located before the
It is in a telephoto state. By pressing a release button (not shown)
The motor 12 receives power supply via the third path in accordance with the shooting start operation.
And move optical systems 3 and 4 from infinity to the nearest
It is displaced in the direction of the optical axis between the positions to adjust the focus. Hope
With primary optical system 3 and secondary optical system 4 for focus adjustment of long-distance photography
The base plate 10 is displaced back and forth. Both shooting in the telephoto state and shooting in the wide-angle state are almost
The shooting method is later changed to the wide-angle state.
Will be described. As shown in FIG. 15, focus in the telephoto area is
The cam member 53 rotates with the rotation of the motor 12 for the point adjustment.
When moving, the vertical rod 58e of the linear holder 58 swings
One inner wall of split groove 59e of lever 59 and finder housing
The cam is held between the rear end of the guide groove 1f provided in 1a and the cam.
The starting teeth 53b of the member 53 and the starting teeth 55b of the switching drive member 55
The driven pin 59a of the variable-magnification swing lever 59 is separated from the cam member 53.
Moves within the range of the first circumferential groove 54a of the cam groove 54, and
The driven pin 59a does not contact the side wall of the first circumferential groove 54a.
The viewfinder optical system operates and changes
It does not get or vibrate. (2) From the telephoto state shown in FIG.
When the release selection member 5 is switched to the wide angle position, the switch SW2
Is turned off, and the input terminal 40 of the logic circuit 40 in FIG.
b becomes Low level. Exclusive or circuit 40e
Output terminal goes high, so the output of the OR circuit 40g
The output terminal is inverted to High level, and the output terminal 40 of the logic circuit 40 is
c and 40d are inverted to High and Low levels, respectively. As a result, the switches SW7a and SW7 shown in FIG.
b is turned on, and switches SW8a and SW8b are turned off. Chief light
System 3 is in the extended position, and switches SW3, SW4, and SW5 are
The switches are ON, OFF, and ON respectively, and switches SW7a and SW7b are
Since it is ON, the first path is formed, and the motor 12
to start. Therefore, the main optical system 3 moves from the extended position to the extended position.
It starts displacing toward. The sub optical system 4 controls the initial rotation of the motor 12.
At the complete insertion position (see FIG. 8)
Shown), it is displaced in the optical axis direction and does not engage with it.
Displaced to the insertion position. The displacement in the optical axis direction is
Is rotated counterclockwise from the state shown in FIG.
By pushing up the sliding contact portion 27c of the driving member 27 in the section B,
Things. The cam 26a is driven by the driving member 27 in the first slope section B.
Before pushing up the sliding contact portion 27c, the engaging portion 27e of the driving member 27
From the position opposing the first small diameter portion 30b of the blocking plate 30a.
The first contact portion 30c comes into contact with the first engagement portion 30c. And secondary light
Before the system 4 reaches the incomplete insertion position, the engaging portion 27e
Is disengaged from the engaging portion 30c, and faces the second small diameter portion 30d.
State. FIG. 12 shows the state immediately before that.
You. The position where the sub optical system 4 reaches the incomplete insertion position
The engagement with the deciding means 28 is released, and the engagement portion 27e is connected to the small-diameter portion 30d.
When opposing, the drive member 27 can swing in the direction crossing the optical axis
As the motor 12 continues to rotate, the sliding contact portion 27c
A surface that is pushed by the first slope section B and crosses the optical axis of the main optical system 3
Swings in the counterclockwise direction. At this time, as shown in FIG. 8 and FIG.
A base plate whose end face is perpendicular to the optical axis of the main optical system 3
It swings in the same direction while sliding on the back 10m of 10. Chief light
When the system 3 approaches the retracted position, the free end 27d of the drive member 27
Abuts against the locking member 10k, its swing is prevented, and the
System 4 reaches the incomplete retreat position where it is not inserted into the circular hole 10 l
You. Since the motor 12 continues to rotate thereafter,
The sliding portion 27c of the driving member 27 is connected to the first slope section B of the cam 26a.
To reach the second flat section C. At this time the blocking plate
The second engaging portion 30c of the driving member 27 is connected to the second engaging portion 30c of the driving member 27.
Touch Subsequently, the sliding contact portion 27c moves the second slope section D
Slide down. At this time, the sliding contact portion 27c is moved by the action of the spring 30.
Sliding down along the second slope section D and clockwise
There is a possibility that the auxiliary optical system 4 will rotate and return to the insertion position.
However, this backward movement is caused by the engagement between the second engagement portion 30e and the engagement portion 27e.
Blocked by contact. The sliding portion 27c slides along the second slope section D.
On the way down, as shown in FIG.
Since it comes into contact with the flange 10i, the sliding contact portion 27c is separated from the cam 26a.
The first flat section A is opposed to, but does not come into contact with, the first flat section A.
You. The accompanying displacement of the driving member 27 in the optical axis direction is
Thus, the small cylinder 4c of the sub optical system 4 is inserted into the circular hole 10l of the base plate 10.
The end surface 4b of the holding cylinder 4a comes into contact with the edge of
It reaches the evacuation position. At this time, the main optical system 3 reaches the retraction position.
Has reached. At this time, the engaging portion 27e is connected to the second engaging portion 30.
e, and is opposed to the first small diameter portion 30b.
You. The front end face of the bearing 27a abuts against the flange 10i.
The driving member 27 stops the displacement in the optical axis direction.
Later, the urging force for inserting the sub optical system 4 into the circular hole 10 l is
Ne 29 supplies. When the main optical system 3 reaches the retracted position, FIG.
The switches SW3, SW4, and SW5 shown in FIG. 9 are OFF, ON, and ON, respectively.
State. When the switch SW3 is turned off, the first
Is cut off, and the power supply to the motor 12 is stopped. Follow
The main optical system 3 is at the retracted position, and the sub optical system 4 is at the completely retracted position.
Respectively, so that the optical system is composed of only the main optical system 3.
And the focal length becomes a wide-angle area. Also switch
Since both switches SW1 and SW5 are ON, automatic focus adjustment and shutter
The controller control circuit 31 is in an operable state, and performs shooting in a wide-angle region.
Shadows become possible. In addition, according to the above state change, the finder
The optical system is switched as follows by the finder switching mechanism
Can be That is, the first finder optical system 6 is inserted at the insertion position.
To the evacuation position. The telephoto state can be switched to the wide-angle state.
Since the base plate 10 is largely retracted, the rack 51 is largely retracted.
Rack teeth 51b, pinions 52a, transmission shafts 52, spur gears 52b,
The cam member 53 is largely rotated by the path of the speed gear 53a.
You. The starting tooth 53b is switched by the rotation of the cam member 53.
Push the starting teeth 55b of the sector 55d of the driving member 55, and
The driving tooth 53b meshes with the driving tooth 53c and the driving tooth 55c.
There is a gap between the teeth 53c and between the starting teeth 55b and the driving teeth 55c.
Since the teeth are missing, the teeth can be smoothly meshed without interference.
Begin a relationship. Then, as shown in FIG. 16, the switching drive member
55 is rotated so that the engagement rod 57c
Is pushed, and the second objective lens 57 is moved about the pivot shaft 57a.
Rotate counterclockwise by the set angle around the center
When the tip of 57c reaches the second cam surface 55f, the second objective lens
57 is kept at a certain angle. In synchronization with the angular displacement of the second objective lens 57,
The first objective lens 56 has a cam portion 55g together with the switching drive member 55.
Draw an arc around the center, and the second objective lens 57 faces forward.
To grab the edge when moving. At this time, the second objective lens 57 is
An approximately trapezoidal sky formed adjacent to the constricted part of the optical system
It is stored in between. Thereafter, the driven pin 59a of the variable-magnification swing lever 59 is
The cam groove 54 reaches the area of the drive groove 54b from the first circumferential groove 54a.
You. Then, the variable-magnification rocking lever 59 moves around the pivot 59b.
Rotate clockwise, thereby splitting groove 59e, driven rod
58e, the linear holder 58 moves forward via the linear motion connecting arm 58d.
Pressed. When the rectilinear holder 58 is pushed forward,
The tip of the pad 57c is the second cam surface 55f of the switching drive member 55.
The second objective lens 57 faces forward as before.
The straight holder 58 and the
The second objective lens 57 replaces the first objective lens 56 and
Pushed out to the position of the first objective lens 56, the zoom lever
59 is inverted and held at the wide angle position by a toggle spring 59d.
The state shown in FIG. 7 is obtained, and the finder optical system for wide angle is obtained. At the same time as switching the above systems, the AF system and
Switching of the display of the distance in the inner wheel is also performed. That is, as shown in FIG.
The driven end 73a of the cam lever 73 is the cam surface of the cam plate 71
When the cam member 53 rotates, the
The end 73a is a focusing operation start position in the telephoto area h.
Moves beyond the telephoto infinity point f and through the standby area e, which is the circumferential surface.
It reaches the line area d, enters the wide-angle area c, and switches to the wide-angle state.
Finally, the driven end 73a is wide-angle as shown in FIG.
Wide-angle infinity point a which is a focusing operation start position in area c
Located in. Thus, the light emitting direction of the light emitting element 8c is the main light.
The direction of infinity is almost parallel to the optical axis of the science system 3. When switching from telephoto to wide-angle, the base plate 10
The rectilinear cam plate 17 also retreats integrally by retreating, as shown in FIG.
And the driven pin 82a engaged with the cam groove 17b is displaced.
And was visible in the viewfinder at telephoto
Pointer 83e moves out of sight so that pointer 83d is in view.
Become. Shooting start operation using a release button not shown
With the operation, the motor 12 rotates by receiving power supply in the third path,
The main optical system 3 is close to the wide-angle region shown in FIG.
The lens is extended toward the position, and the focus is adjusted. [0160] As the motor 12 rotates,
The gear 14 rotates, and the gear 14 moves back and forth with respect to the base plate 10.
Cannot move along with the base plate 10 along the guide shaft 15.
You. The movement of the base plate 10 is pinched via the rack teeth 51b of the rack 51.
The transmission shaft 52 transmits the spur gear 52b and the reduction gear
The rotational motion is transmitted to the cam member 53 via the wheel 53a.
It is. The gear 50b urged by the spring 50c is a reduction gear.
Backlash during meshing because it is meshed with 53a
Power is transmitted, and transmission is performed with high accuracy. When the reduction gear 53a rotates, the cam member 53 also moves.
And the driven end 73a follows the cam surface of the cam plate 71.
The cam lever 73 is rotated and displaced in accordance with the shooting distance. Wide
Since it is angle shooting, the driven end 73a is located at infinity in the wide-angle area c.
It moves from a to the closest point b. Telephoto
It moves from the infinity point f in the far area h to the closest point g. The displacement of the cam lever 73 depends on the tilt of the light emitting element 8c.
And the light from the light-emitting element 8c is close from infinity
Swung in the direction. When this ray hits the subject,
Then, the light is reflected and returns to the light receiving element 8d. Light reception at this time
The change in the output state of the element 8d is calculated by the distance measuring device, and
When the expected focus detection output is reached, the motor 12
Stops. At this time, the photographing optical system (main optical system 3) is
Is in focus. With the completion of focusing, the light emission of the light emitting element 8c
Stopped, and shooting is continued. The cam member 53 and others have inertia,
Since the stopping distance has a deviation, the cam surface of the cam plate 71
It has been considered in advance. When the base plate 10 moves back and forth, the linear motion cam plate 17
Slide lever via the driven pin 82a by the cam groove 17b
-83 is moved in the horizontal direction and the finger is
As the hand 83d moves, look at the pointer while looking through the finder.
Know the approximate distance to the subject from the marks in the field of view
Can be. For telephoto shooting, the pointer 83e works in the same way.
You. When the release button is released, the motor 12 rotates reversely,
The main optical system 3 is retracted to the infinity position in the wide-angle region,
The driven end 73a of the lever 73 faces the point a at infinity a for the next photographing.
Prepare for. Position detection is performed by switches SW3, SW4, and SW5.
Is done. Motor for Focus Adjustment in Wide Angle Region
During the rotation of 12, the sliding portion 27c of the driving member 27 is in the first flat section.
The driving member 27 moves because it only faces the gap A and does not contact
And the sub optical system 4 remains at the completely retracted position.
You. In the wide-angle state, a cam portion for focus adjustment
Even if the material 53 is rotated, the vertical rod 58e of the
With the biasing force, the inner wall of the split groove 59e of the variable
Between the front end of the guide groove 1f provided in the viewfinder housing 1a
And is held between them. The driven pin 59a of the variable-magnification swing lever 59 is a cam part.
Moving within the range of the second circumferential groove 54c of the cam groove 54 of the material 53,
The driven pin 59a does not contact the side wall of the second circumferential groove 54c.
So that the driven pin 59a is
Since it moves within the area of the groove 54c, the variable-magnification swing lever 59 swings.
The drive teeth of the sector 55d of the switching drive member 55
The end of 55c is in sliding contact with the sliding edge 53d of the cam member 53.
Therefore, the second objective lens 57 is not displaced and is stably
Is held. (3) Open the dustproof cover 2 from the telephoto state
Switch SW1 is turned off when displaced from
And the input terminal 40a of the logic circuit 40 becomes low level.
Output terminal of the exclusive OR circuit 40e
Be a bell. The following operation is the same as (2),
Although the selecting member 2 is at the telephoto position, the main optical system 3
The sub optical system 4 is displaced from the extended position toward the extended position, and the
It is displaced from the full insertion position to the completely retracted position. When the main optical system 3 is displaced to the retracted position, dust proofing is performed.
The cover 2 can be displaced to the closed position. Prevention
When the dust cover 2 reaches the closed position, the switch SW1
Switch SW1a is turned off, so automatic focus adjustment and shutter
The power supply to the printer control circuit 31 was cut off, making shooting impossible.
You. Similarly, in a finder optical system, an AF system, etc.
Even when the telephoto position is switched to the wide-angle position,
Will be. (4) The dustproof cover 2 is closed from the wide-angle state.
To the switch SW1a, which is in phase with the switch SW1.
Is turned off, the automatic focus adjustment and shutter control
The power supply to the road 31 is cut off, and photographing becomes impossible. (5) Selecting the focal length from the wide-angle state shown in FIG.
When switch 5 is switched to the telephoto position, switch SW2 turns on.
And the input terminals 40a, 40a of the logic circuit 40 shown in FIG.
40b are both High level. Exclusive or times
The output terminals of the path 40e and the NOR circuit 40f are both Low level.
Therefore, the output terminal of the OR circuit 40g is inverted to Low level,
The output terminals 40c and 40d of the logic circuit 40 are low and high levels, respectively.
Flip to As a result, the switches SW7a and SW7 shown in FIG.
7b is turned off and switches SW8a and SW8b are turned on.
Since system 3 is in the retracted position, switches SW3, SW4, SW5
Are in the OFF, ON, and ON states, respectively. Switch SW8a, S
Since W8b is ON and switch SW4 is ON, the second
Is formed, and the motor 12 moves in the opposite direction to that in (2).
Start spinning. Therefore, the main optical system 3 is extended from the retracted position.
Start to displace towards the position. With the initial rotation of the motor 12, the auxiliary optical system 4
Is displaced in the optical axis direction from the completely retracted position shown in FIG.
It comes out of the hole 101 and is displaced to the incomplete retreat position. This optical axis
When the cam 26a rotates and the second slope section D
This is due to pushing up the sliding portion 27c of the moving member 27.
You. The cam 26a is driven by the drive member 27 in the second slope section D.
Before pushing up the sliding contact portion 27c, the engaging portion 27e of the driving member 27
From the position opposing the first small diameter portion 30b of the blocking plate 30a.
It comes into contact with the second engagement portion 30e. And secondary optics
Before the system 4 reaches the partially retracted position, the engaging portion 27e is moved to the second position.
Disengage the engagement with the engagement part 30e and face the second small diameter part 30d.
State. FIG. 11 shows the state immediately before this. After that, the sub optical system 4 reaches the incomplete retreat position.
When the driving member 27 comes out of the circular hole 10 l,
It is possible to swing in a direction crossing the optical axis. With the subsequent rotation of the motor 12, the sliding contact portion 27c is
It is pushed in a direction crossing the optical axis by the second slope section D.
Then, the driving member 27 swings in the same direction, and the small cylinder 4c of the sub optical system 4
Incomplete evacuation while sliding on the back 10m of the base plate 10
From position to incomplete insertion position. When the main optical system 3 approaches the extended position, the drive unit
The free end 27d of the member 27 comes into contact with the locking member 10j,
The sub optical system 4 is stopped at the incompletely inserted position. So
After that, the motor 12 continues to rotate, so that the drive member 27 slides.
The contact portion 27c rises along the second slope section D of the cam 26a,
2 It reaches the flat section C. At this time, the first
The engagement portion 30c engages with the engagement portion 27e of the driving member 27. Subsequently, the sliding contact portion 27c is moved as shown in FIG.
Then, slide down the first slope section B. At this time, the action of the spring 30
Causes the driving member 27 to move counterclockwise along the first slope section B.
And the auxiliary optical system 4 may return to the retracted position.
However, the engagement portion 27e engages with the first engagement portion 30c and is blocked.
Is done. The sliding portion 27c slides down the second slope section D.
On the way, the front end face of the bearing 27a comes into contact with the flange 10i.
The sliding portion 27c is separated from the cam 26a and faces the first flat section A.
To a state where they do not touch. The displacement of the driving member 27 in the optical axis direction accompanying this
Thus, the small cylinder 4c of the holding cylinder 4a of the sub optical system 4 is
After contacting the guide surface 28b of 28, it is guided by this
28a, the end surface 4b of the holding cylinder 4a is
It comes into contact with the contact surface 28c and reaches the full insertion position shown in FIG.
Positioning of the sub optical system 4 is completed. At this time, the main optical system 3
Has reached the delivery position. At this time, the engaging portion 27
e is disengaged from the first engagement portion 30c, and the first small-diameter portion
It faces 30b. It is to be noted that the bearing 27a must be in contact with the flange 10i.
After the driving member 27 stops the displacement in the optical axis direction due to
The biasing force for engaging the optical system 4 with the positioning means 28 is a spring.
29 supplies. When the main optical system 3 reaches the extended position,
As described in (1), the switches SW3, SW4, and SW5 are
They are ON, OFF, and ON respectively. Switch SW4 is OFF
Then, the second path is cut off, and the power supply to the motor 12 is stopped.
Is stopped. Therefore, as shown in FIG.
In the position, the sub-optical systems 4 are respectively stopped at the fully inserted position,
A synthetic optical system is constructed, and its focal length is in the telephoto range.
You. Since both switches SW1a and Sw5 are ON, automatic focusing
The point adjustment / shutter control circuit 31 is in an operable state,
Shooting with a telephoto optical system is possible. A finder optical system according to the above switching operation
Is switched from the wide-angle state to the telephoto state. That is, the main optical system 3 and the sub optical system 4
When switching to the telephoto state, the base plate 10 moves forward greatly.
Therefore, contrary to the above, the cam member 53 rotates largely. Accordingly, the driven pin 59 of the variable-magnification swing lever 59 is
a reaches the drive groove 54b from the second circumferential groove 54c of the cam groove 54,
The zooming lever is changed from the state shown in FIGS. 14 and 15 (C).
59 rotates counterclockwise, and the second objective lens 57 and the straight
Pull the holder 58 back. Second objective lens 57 and direct
When the advance holder 58 moves backward, the tip of the engagement rod 57c switches.
Abuts against the second cam surface 55f of the cam portion 55g of the drive member 55,
(2) The objective lens 57 is inclined at an angle about the pivot axis 57a.
It is kept in a state. In synchronism therewith, the drive teeth 53c are
, The switching drive member 55 is rotated clockwise, and
The first objective lens 56 that has been stored is turned around the pivot axis 55a.
And rotate clockwise. Next, the tip of the engagement rod 57c is a cam 55g.
Reaches the first cam surface 55e, and finally the second objective lens 57
Facing the front, the straight holder 58 is in front of the second objective lens 57
And return to the telephoto state shown in FIG. Similarly, the display of the distance in the viewfinder is the same as in the above (2).
Switching from wide-angle to telephoto by reverse operation
It is. (6) The dustproof cover 2 was covered in the telephoto state.
When the dust cover 2 is displaced toward the open position from the state,
The switch SW1 turns ON and the input terminal of the logic circuit 40
Both 40a and 40b become High level. The following is (5)
The operation is the same as described above. The photographing and optical system switching operations are described in
23 will be specifically described as follows. (A) The operation at the time of photographing is as follows. The shooting operation is performed in either the wide-angle area W or the telephoto area T.
The same applies to the case of. The signal of the decoder 204 is the extension amount of the photographing optical system.
In other words, it indicates the subject distance, and when a strobe is used
Input to the aperture control circuit 225 for flash
Then, shooting conditions corresponding to each step are set. Shooting
The distance measurement is started from step 8 in the encoder.
Done. A hand switch is used as a distance measurement start switch.
When 226 turns on, it normally goes to H level with resistor 227.
The input on one side of the NAND gate 229 that has been turned to L becomes low. NA
ND gate 228 and NAND gate 229 are RS free.
Since the flip-flop is configured, the NAND gate 229
Becomes low, the output of the NAND gate 229 becomes low.
Becomes H level, and this signal is given to the AND gate 230.
Can be If the other input of AND gate 230 is H
The output of the AND gate 230 becomes H and is controlled by the output.
The output of the NOR gate 231 is L, and the output of the OR gate 234 is H
As a result, the PNP transistor 235 turns on and the NPN transistor
The transistor 238 is also turned on and the driving motor 12
Transistor 235, drive motor 12, NPN transistor 238
A current path is formed, and the drive motor 12 rotates. At this time
The rotation direction of is assumed to be forward rotation. The rotation of the drive motor 12 causes the photographing optical system to rotate.
Driven, and at the same time, the light emitting LED 243 is tilted by the mechanism
And scan. Focus detection circuit 240
H is output at the time of focusing according to the output state of. This H signal is output to O
R gate 244, and all other inputs of OR gate 244
L, the output from the focus detection circuit 240
R gate 244 outputs an L signal, which is a NAND gate
228 and the output of NAND gate 229 resets to L.
Is set. Therefore, the output of the AND gate 230 also becomes L.
And the NOR gate that used to drive the drive motor 12
The output of 231 becomes H and the output of OR gate 234 becomes L
And the PNP transistor 235 and the NPN transistor 238
Each is turned off, the drive motor 12 stops, and no
Is done. When photographing is completed, the photographing optical system is in the photographing start position.
Is reset to The photographing optical system reset switch 249 is turned on.
Then, one input is fixed to H level by the resistor 250.
The output of the NAND gate 252
Is NAND gate 251 and NAND gate 252 are R
-S flip-flop, so that the NAND gate
252 is kept in that state. NAND gate 252 is set to H
And the NOR gate 233 and OR connected to it
Gate 232 outputs L and H respectively, and PNP transistor
The star 236 and the NPN transistor 237 are turned on, and the PNP
Transistor 236, drive motor 12, NPN transistor 23
7, a current path is formed, and the drive motor 12 rotates in the reverse direction. This
Is reversed when the photographing optical system is stepped from a position other than step 8.
The operation is repeated in step 8. When the drive motor 12 rotates in the reverse direction, the photographing optical system
Is entered and step 8 is entered.
Gate 212 outputs an H at terminal 212a, thereby
One-side input of NAND gate 251 via L
Resets the output of NAND gate 252 to L
The NOR gate 233 and the OR gate 232 output L.
PNP transistor 236 NPN transistor 237
And the drive motor 12 stops. [0204] From the start of photographing, the above procedure is taken to prepare for the next photographing.
This is the operation up to setting. Until focusing, the output of the focusing detection circuit 240 is output.
The force is input to the OR gate 244 via the inverter 245.
However, the OR gate 244 has terminals 211a and
And the output of terminal 212a are connected.
It becomes H in steps 7 and 8. As described above, the focus detection is started by hand pressing.
When the switch 226 is turned on, the drive motor 12
Driven at the same time, but at the same time the encoder pattern shown in FIG.
The brush slides over the top, in each case the starting point is step 8
It is. Therefore, the range of the position of step 8 and step 7
The output is always H in the
Even if the focus detection signal is input, that signal is ignored.
Will be. This means that the focus detection operation
Due to power fluctuations that occur when the motor 12 starts, etc.
Even if the focus detection circuit 240 generates an erroneous signal,
It will be effective. Also, when the subject is at infinity or the like,
The output of the output circuit 240 outputs an H signal from the beginning.
And the outputs of the terminals 211a and 212a of the decoder 204 are
If it is H, in steps 7 and 8, the NAND gate 229 is set.
Output is not reset.
a, when both outputs of the terminal 212a become L.
Stops. This position is set as the infinity distance. What
Note that this infinity setting is based on the depth of field of the optical system.
If taken into account, the hyperfocal distance may be set. Also,
When the focus detection circuit 240 does not output the focus detection signal,
If the subject distance is too short, the NAND
Port 229 is not reset and drive motor 12 is
In this case, the AND gate 230
Operated by NOR gate 246 input to one side of
Is controlled. That is, NOR gate 246 is a decoder
When the output of the output terminal 205a of H is
Or the decoder 20 with the telephoto detection switch 258 turned on.
4. The output of the terminal 206a is H, that is, the step 2 is detected.
As a result, an L output is generated, forcing the output of the AND gate 230.
To L. This is due to the extension of the shooting optical system.
It is nothing more than a limit. In this embodiment
Limits the position in step 1 in the wide-angle area, and
Restricts the position in step 2, but the same step
But no problem. The output of the NOR gate 246 causes A
When the output of the ND gate 230 is controlled, the NAND gate
229 remains unreset, but the reset
The reset is performed by inputting L to the reset terminal 244a.
be able to. [0209] The determination step as the reset position is performed.
Mask step to prevent erroneous signals during startup during
Of the focus stop position at the time of
The same steps are used for both the wide-angle range and the telephoto range.
Is set. It was different in each range
Steps can be set, but common steps
The common control circuit can be used by setting the
There is an advantage that can be. (B) Behavior when switching the photographing optical system
The work is as follows. When switching from the wide-angle region to the telephoto region,
Switch 254 is turned on for switching.
Then, the NAND fixed to H by the resistor 255
One side input of the gate 256 becomes L, and the RS flip-flop
NAND gate 256 and NAND gate
257, the output of the NAND gate 256 is set to H.
Is held. At this time, the D flip-flop 259
Is high at the output of NAND gate 256.
Connected to the D input of the D flip-flop 259.
Read the state of the far detection switch 258 via the terminal 258a.
Output. The telephoto detection switch 258 is located on the encoder.
Corresponds to the output from the pattern 63e.
It is set to be turned on in the far region T. Therefore, in the wide-angle area W, an optical system switching instruction is issued.
When switch 254 is turned on, telephoto detection switch 258
Is off, the output of D-flip-flop 259 is H
Becomes By this H signal, the output of the AND gate 263 becomes
H, NOR gate 231 is L, OR gate 234 is H
As a result, the drive motor 12 rotates forward as described above. Drive module
Switches 201, 202, and 203 are stepped by forward rotation of motor 12.
8 to 1 is output.
In the far region T, step 8 is performed, and the decoder 204
When the output of the terminal 212a is output as H, the NAND gate
Through the gate 261 and the one-sided input of the NAND gate 257 becomes L
And the output of NAND gate 256 is reset to L
The drive motor 12 stops. Here, NAND gate 261 is a delay circuit.
Is controlled by road 260, which
Terminal 21 after setting a delay from the start of forward rotation of
2a is transmitted to the NAND gate 257.
When driving from the telephoto area T to the wide-angle area W.
When the dynamic motor 12 is started, the NAN
Prevents D-gate 256 from being reset on the fly.
You. When switching from telephoto area T to wide-angle area W
When the optical system changeover switch 254 is turned on,
Since the detection switch 258 is on, the D-flip
The output of the flop 259 becomes L. Therefore, the AND gate
The output of 263 becomes L, and the output of AND gate 263 becomes IN.
It becomes H through the barter 262, and this causes the drive motor 12
Is driven in reverse. Stopping is the same as for normal rotation.
Therefore, the description is omitted. According to the present embodiment, the wide-angle area a,
Each cam surface of the transition area d, the standby area e, and the telephoto area h is made of synthetic resin
Since it is formed by integral molding on the cam plate 71 made of
Manufacturing and assembly are simplified. The relative position between the cam plate 71 and the photographing optical system is determined.
The position can be adjusted by adjusting mechanisms 71a and 71b
Therefore, high focus adjustment accuracy can be obtained. The wide-angle area a and the telephoto area h of the cam plate 71 are
Because of the body molding, the relative position of both areas can be changed
It is not possible to adjust the back out of the telephoto area h by using the main optical system.
It can be done by adjusting the air gap between 3 and the sub optical system 4.
It was to so. Note that, in the above embodiment, prior to photographing,
Shooting optics focus on infinity subject during auto focus
From the position where the subject is in focus toward the closest subject
However, the present invention is not limited to this,
It can also be applied to a configuration. Also, in the above embodiment,
The focal length at which the shooting optical system can be switched is between wide-angle and telephoto.
Although there were two types, the present invention is not limited to this and three or more types
It can also be applied to a configuration that can be switched to. According to the present invention, an optical system can be used for controlling photographing conditions.
First signal pattern for providing information about the position of the system
Is placed on the first arc and the stop control of the optical system is
A second signal pattern for providing information on the position of the optical system
And the optical system are fixed in a predetermined state, and the circuit board is
When the circuit board is rotatable around a point,
A third signal for detecting that it is located at the predetermined rotation position
At least one of the patterns is a half of the first arc
Since it is arranged on the second arc having a diameter, the present invention
According to the signal change due to the signal pattern on the first arc
To control the shooting conditions,
Control that does not require much information, and the signal on the first arc
The second arc shape that can obtain more accurate information than the pattern
Optical system stop control according to signal change due to signal pattern
Control, or determination of the reference position between the optical system and the circuit board.
Control that requires high-precision optical system position information.
The high accuracy of the position information
Controls that require accurate position information can be performed,
For control that does not require much accurate positional information,
There is no need to occupy a lot of space on the circuit board.
The space on the board can be used effectively without waste,
Position detection device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a pattern layout diagram showing a detection area of an encoder according to an embodiment of the present invention. FIG. 2 is a perspective view schematically showing an internal mechanism of the camera, showing one embodiment of the present invention. FIG. 3 is a plan view showing one embodiment of the present invention, in which a part of the camera is cut away. FIG. 4 is a plan view of a camera, showing one embodiment of the present invention. FIG. 5 is a plan view of a camera, showing one embodiment of the present invention. FIG. 6 is a vertical sectional view of the camera, showing one embodiment of the present invention. FIG. 7 is a horizontal sectional view of the camera, showing one embodiment of the present invention. FIG. 8 is a detailed sectional view of a main part of a sub optical system insertion / removal mechanism, showing an embodiment of the present invention. FIG. 9 is a detailed sectional view of a main part of a sub optical system insertion / removal mechanism according to an embodiment of the present invention. FIG. 10 is a cross-sectional view schematically illustrating a main part of an auxiliary optical system insertion / removal mechanism according to an embodiment of the present invention. FIG. 11 shows an embodiment of the present invention, and is a front view of a blocking mechanism interlocked with a sub-optical system insertion / removal mechanism. FIG. 12 shows an embodiment of the present invention, and is a front view of a blocking mechanism interlocked with a sub-optical system insertion / removal mechanism. FIG. 13 is a plan view of the automatic focusing mechanism, showing one embodiment of the present invention. FIG. 14 is a vertical sectional view of the automatic focusing mechanism, showing one embodiment of the present invention. FIG. 15 is a plan view showing a finder optical system switching mechanism according to an embodiment of the present invention. FIG. 16 is a plan view illustrating a finder optical system switching mechanism according to an embodiment of the present invention. FIG. 17 is a plan view showing the vicinity of a cam plate according to an embodiment of the present invention. FIG. 18 is a plan view showing the vicinity of a cam plate according to an embodiment of the present invention. FIG. 19 shows an embodiment of the present invention, and is a motor control circuit diagram for driving an optical system. FIG. 20 is a logic circuit diagram showing one embodiment of the present invention and controlling the operation of a motor control circuit. FIG. 21 is a cam diagram showing an embodiment of the present invention. FIG. 22 is a diagram showing the relationship between the diameter of a circle of confusion and the depth of field, showing one embodiment of the present invention. FIG. 23 is a detailed control circuit diagram showing an embodiment of the present invention. [Description of Signs] 1… Camera main body 1a… Finder storage section 3… Main optical system 4… Sub optical system 10… Base plate 12… Motor 26… Cam gear 27… Drive member 51… Rack 53… Cam member 55… Switching drive member 56 first objective lens 57 second objective lens 61 detection brush plate 62 encoder printed board 71 cam plate 73 cam lever

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G03B 17/12 G02B 7/02

Claims (1)

(57) [Claims] A signal pattern arranged on an arc centered on a predetermined point on the circuit board, and signal generating means for generating a signal in accordance with a relative displacement between the signal pattern on the arc and In a position detecting device for detecting information on a position of an optical system, the signal pattern is a first signal pattern for giving information on a position of the optical system for controlling a photographing condition, and a stop signal for controlling stop of the optical system. A second signal pattern for providing information on the position of the optical system, and a circuit board which is fixed in a predetermined state and the circuit board is rotatable around the predetermined point, and the circuit board is rotated a predetermined number of times. At least one of a third signal pattern for detecting that it is located at the moving position, and arranging the first signal pattern on a first arc centered on the predetermined point. Wherein at least one of the second and third signal patterns is arranged on a second arc centered at the predetermined point and having a larger radius than the first arc. 2. The position detecting device according to claim 1, wherein the control of the photographing condition is flashmatic control. 3. Stop control of the optical system, and no signal stop position control,
3. The position detecting device according to claim 1, wherein the position detecting device is at least one of closest distance stop position control and ranging start point stop position control.