JP3089487B2 - Camera ranging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distance measuring device provided in a camera for measuring a distance to a subject.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. Sho 60-217321 and Japanese Patent Publication No. 1-57891 disclose a method in which a distance measuring means is moved from one end to the other end of a photographing screen so that an object to be photographed can be moved to any position on the photographing screen. However, there is disclosed an autofocus camera capable of performing multi-point distance measurement so that a photographing lens can be easily focused on the object.

[0003]

In the above-mentioned conventional camera, by performing multi-point ranging, it is possible to prevent so-called centering, in which the background of the subject is in focus if only one-point ranging is performed. However, since the distance measuring means automatically operates as described above when the shutter is released, there is a problem that even when it is desired to focus on a specific subject, it may not be possible immediately.

[0006] A distance measuring apparatus capable of performing multi-point distance measurement and single point distance measurement is conceivable, but has various problems.

That is, at the time of single-point distance measurement, it is not necessary to move the distance measuring means, but it is necessary to stop the lens so that distance measurement is possible and to lock the focus. At the time of multi-point distance measurement, it is necessary to move the distance measuring means. Since a focus lock is not required, a structure corresponding to these operations is required.

When a focus lock function is added to the conventional multi-point distance measurement, a driving sound is generated by the operation of a mechanical system when the distance measuring means is moved. However, the driving sound is generated when the first release is turned on. However, there is also a problem that the photographer mistakenly thinks that the shutter has been released, and the shutter cannot be reliably released.

Further, in the above-mentioned autofocus camera, the reset of the movement of the distance measurement range is performed in conjunction with the winding of the film, and when multiple exposure is desired, it is independent of the winding of the film. There is a problem in that the reset must be performed, but cannot be dealt with.

In the projection type distance measuring method in which light projected from a light emitting element is received by a light receiving element to measure a distance, one point is measured a number of times in order to increase the distance measuring accuracy. A large number of times of light emission employing a value obtained by averaging are usually adopted, and the multiple times of light emission usually requires several tens of msec per point. Therefore, it is necessary to stop the distance measuring optical system during light emission. However, in the automatic focusing camera, since the distance measuring optical system is continuously moved, there is a problem in data reliability.

An object of the present invention is to solve the above-mentioned conventional problems.
It is an object of the present invention to provide a camera distance measuring device that solves the problem of the photographer's erroneous operation due to the driving sound of the distance measuring optical system unit, and that can properly and reliably measure the distance according to the photographer's intention.

[0010]

To achieve the above object, according to the present invention, there is provided a first-stage release switch, a second-stage release switch which is operated after the first-stage release switch, and A rotatable ranging optical system unit that moves from one end of the shooting screen to the other end and performs ranging.
In a camera distance measuring apparatus provided with a driving means for rotating the distance measuring optical system unit, a range to be measured of the distance measuring optical system unit which is rotated / stopped by the driving means is measured by multi-point ranging and single-point measuring. Switching means for switching to the distance, and in the case of multi-point distance measurement, the distance measurement by the distance measuring optical system unit is started by the operation of the second stage release switch, and in the case of single point distance measurement, the distance measurement is operated by the operation of the first stage release switch. And control means for starting the operation.

According to a second aspect of the present invention, in the distance measuring apparatus for a camera according to the first aspect, at the time of one-point distance measurement, the distance measuring optical system unit is stopped so as to be capable of distance measurement by the operation of the switching means. It is characterized by comprising.

[0012]

According to the first aspect of the present invention, the range to be measured by the distance measuring optical system unit which moves from one end to the other end of the photographing screen and measures the distance is multi-point distance measuring or single point measuring by the switching means. The distance measurement target range can be changed to suit the photographer's intention, and the distance measurement optical system unit does not operate when the first-stage release switch is turned on during multi-point distance measurement, and the operation sound is reduced. When the second-stage release switch is turned on and the second-stage release switch is turned on, the distance measurement by the operation of the distance-measuring optical system unit is started, so that the photographer feels as if the shutter was released when the first-stage release switch was turned on. Mistakes are prevented, and at the time of single-point distance measurement, distance measurement for the object is performed by turning on the first-stage release switch, so that focus on a specific object is immediately performed.

According to the second aspect of the present invention, the first first
At the time of one-point distance measurement in which the distance measurement is started by the operation of the step release switch, focus lock is performed, so that a free photograph of a composition focused on a specific subject can be reliably taken.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the overall configuration of a first embodiment of the present invention. 1 is a distance measuring optical system unit, and 2 and 3 are a light emitting element and a light receiving element built in the distance measuring optical unit 1. ,
Reference numerals 4a and 4b denote condensing lenses provided in front of the elements 2 and 3, reference numeral 5 denotes a support shaft rotatably supporting the distance measuring optical unit 1, and reference numeral 6 denotes an output from the distance measuring optical unit 1. A distance measuring circuit for calculating a subject distance, 7 is a distance measuring optical system unit 1
, A worm wheel rotating about a central axis 8, a cam 9 fixed to the upper surface of the worm wheel 7,
Reference numeral 10 denotes a photo-encoder disk fixed to the lower surface of the worm wheel 7, reference numeral 11 denotes a driven arm protruding from the side of the distance measuring optical system unit 1 and abuts on the cam side surface 9a of the cam 9, and reference numeral 12 denotes a photo-encoder disk. A photo encoder 13 opposed to a peripheral portion of the worm wheel 13; a worm gear 13 meshing with a tooth portion 7a engraved on an outer peripheral portion of the worm wheel 7; a DC motor 14 for rotating the worm gear 13;
15 is a motor driver provided for the DC motor 14,
Reference numeral 16 denotes a switch as switching means for switching a range to be measured, as will be described later. Reference numeral 17 denotes an urging spring which pulls the distance measuring optical system unit 1 in a fixed direction (counterclockwise).
8 is a release button, 19 and 20 are a first-step release switch and a second-step release switch which are turned on stepwise by the release button 18, 21 is a taking lens, 22 is a focusing motor, and 23 is a focusing motor 22. The provided motor driver, 24 is a drive gear body driven by the focus motor 22, 25 is a holding body that holds the photographing lens 21 and is laterally moved by the drive gear body 24 under the guidance of the guide shaft 26, 27 is A shutter unit, 28 is a shutter motor, 29 is a motor driver provided for the shutter motor 28, 30 is a lens position detection encoder that detects the movement position of the holding body 25, and 31 is an A / D (analog / analog). Digital) converter 32, a distance measuring circuit 6, a photo encoder 12, motor drivers 15, 23, 29, switching means 16, first stage Release switch 19, a second stage release switch 20, and A / D converter 31 is a control means connected to the lens position detecting encoder 30 via a CPU (central processing unit).

FIG. 2 is an explanatory view of the cam shape of the cam 9, and FIG. 3 is an explanatory view of a finder and a distance measurement range.
On the side surface of the cam 9, a plurality (five stages in this embodiment) of cam side surfaces 9 a having different diameter lengths from the center of the central shaft 8.
Are formed, and the cam side surface 9a of the above-mentioned five stages is provided.
As a result, the distance measuring optical system unit 1 is rotated via the driven arm 11 as described below, and
The distance measurement target ranges 〜 to 箇 所 of the locations are measured corresponding to the five stages of the cam side surface 9a.

The worm wheel 7, the cam 9, the driven arm 11, the worm gear 13, and the DC motor 14 constitute driving means for the distance measuring optical system unit 1.

Next, the basic operation of the embodiment will be described.

When the release button 18 is pressed and the first and second stage release switches 19 and 20 are turned on as described later, a drive signal is output from the CPU 32 to the motor driver 15 and the DC motor 14 is driven. Worm gear 1
3 rotates. The rotation of the worm gear 13 causes the worm wheel 7 to rotate about the central axis 8. The rotation of the worm wheel 7 causes the cam 9 and the photo-encoder disk 10 to rotate together.
The driven arm 11 is pressed by the
Are rotated about the support shaft 5, and each of the distance measurement target ranges
For each ′, the distance measuring circuit 6 calculates the subject distance by the known light projection of the light emitting element 2 onto the copy body and the output based on the optical change of the reflected light from the subject by the light receiving element 3. The rotation of the photo encoder disk 10 is
The detection signal is detected by the photo encoder 12, and in this photo encoder 12, a control signal for stopping the distance measurement optical system unit 1 in each of the distance measurement target ranges ′ to ′ is transmitted to the CPU 3.
2 is output.

When the distance measurement is performed as described above and the distance measurement data of the target object is output to the CPU 32, the focus motor 22 is driven via the motor driver 23 to rotate the drive gear body 24. Then, the holder 25 and the photographing lens 21 are moved. The movement of the photographing lens 21 is detected by the lens position detection encoder 30, and when the photographing lens 21 is extended to a position corresponding to the distance measurement data,
A stop signal is output from the CPU 32 to stop the focus motor 22, and the movement of the photographing lens 21 is stopped. Then, a shutter signal is output from the CPU 32 to the motor driver 29, and the shutter motor 27 opens and closes the shutter section 27 for a predetermined time. Thereafter, feeding of a film (not shown) is performed.

The basic operation of multipoint ranging according to the first embodiment will be described with reference to the timing chart of FIG.

When the multipoint ranging mode is selected by the switch 16 and the release button 18 is turned on, the driven arm 11 is located at the first stage of the cam side surface 9a which is the home position. In the state, the first range to be measured '
Is measured. When this distance measurement ends, CP
When the drive signal is output from U32 and the DC motor 14 is driven, and the photo encoder 12 detects that the driven arm 11 is located at the second stage of the cam side surface 9a, the DC
The motor 14 is stopped, and in this state, the second range
Is measured. After that, the ranging in the third ranging target range 'to the fifth ranging target range' is sequentially performed in the same manner.

After the extension of the photographing lens (not shown) and the shutter operation are performed in accordance with the target object distance,
The DC motor 14 is turned on, and the cam 9 is rotated so that the driven arm 11 is located at the first stage of the cam side surface 9a, which is the home position.

Next, the switching operation between multi-point ranging and single-point ranging according to the first embodiment will be described with reference to the timing chart of FIG.

First, when the mode is switched from the multi-point ranging mode to the one-point ranging mode by the switch 16, a drive signal is output from the CPU 32 to drive the DC motor 14, and the driven arm 11 is moved by the photo encoder 12 to the side surface 9a of the cam 9a. When it is detected that it is located at the third stage (the center of the shooting screen),
The DC motor 14 is stopped. Then, when the release switch is turned on, distance measurement in the third distance measurement target range 'is performed.

Here, when the mode is switched to the multipoint ranging mode by the switch 16, the DC motor 14 is driven, and when the photo encoder 12 detects that the driven arm portion 11 is located at the first stage of the cam side surface 9a. Then, the DC motor 14 is stopped. Thereafter, the operation described in the timing chart of FIG. 5 is performed.

FIG. 6 is a timing chart showing another example of the cam control method. In this example, the driven arm 11 of the distance measuring optical system unit 1 is measured at the third stage of the cam side surface 9a of the cam 9. The CPU 32 is always positioned at the start of the distance, the third stage is used as the home position of the driven arm 11, and the CPU 32 performs distance measurement from the third stage through the second, first, fifth, and fourth stages. By controlling, the driving of the DC motor 14 at the time of switching between multi-point ranging and single-point ranging can be eliminated.

By adopting the control method described above in the first embodiment, the range to be measured by the distance measuring optical system unit that moves from one end of the photographing screen to the other end to measure the distance is, for example, multi-point measurement. The distance can be changed so that the distance and single point distance can be measured.In multi-point distance measurement, it is possible to prevent dropouts, reduce the number of out-of-focus photos, and use one-point distance measurement when you want to focus on a specific subject. As a result, focusing can be performed immediately, and necessary distance measurement that matches the intention of the photographer can be performed.

FIGS. 7 and 8 are timing charts showing a control method in which the distance measurement is performed by operating the first-stage release switch 19 and the second-stage release switch 20 in a timely manner.

FIG. 7 shows a timing chart at the time of multi-point distance measurement. When the multi-point distance measurement is selected by the switch 16 and the release button 18 is pressed, the first stage release switch 19 is turned on, and When the CPU 32 outputs that the second-stage release switch 20 is turned on, the driven arm 11
Is located at the third stage of the cam side surface 9a, which is the home position.
Is measured. When this distance measurement ends, CP
When the drive signal is output from U32 and the DC motor 14 is driven, and the photo encoder 12 detects that the driven arm 11 is located at the second stage of the cam side surface 9a, the DC
The motor 14 is stopped, and in this state, the second range
Is measured. Thereafter, distance measurement in the first, fifth, and fourth distance measurement target ranges', ',' is sequentially performed in the same manner.

When the distance measurement for all of the distance measurement target ranges 〜 to 終了 is completed, the photographing lens 2 corresponding to the target object distance is set.
1 and the opening / closing operation of the shutter portion 27 are performed, and the cam 9 is rotated so that the driven arm portion 11 is located at the third stage of the cam side surface 9a which is the home position.

FIG. 8 is a timing chart for one-point distance measurement. One-point distance measurement is selected by the switch 16, the release button 18 is pressed, and the first-step release switch 19
Is output to the CPU 32, the driven arm 11 is held at the third stage position on the cam side surface 9a, which is the home position. The distance is measured and the focus is locked.

Next, when the release of the second-stage release switch 20 is output to the CPU 32, the extension of the photographic lens 21 corresponding to the target object distance and the shutter section 2 are performed.
7 is performed, and then the film is fed.

At the time of multi-point distance measurement by the control method described with reference to FIG. 7, since the operating sound is not generated when the first-stage release switch 19 is turned on, there is no generation of sound that makes the photographer mistake the shutter opening / closing sound. When the second-stage release switch 20 is turned on, the shutter is reliably released.

At the time of one-point distance measurement by the control method described with reference to FIG. 8, since the distance measurement is performed by turning on the first-stage release switch 19 and the focus can be locked, the focus of a specific object can be easily and reliably adjusted.

FIG. 9 is a block diagram showing a reference example of a camera distance measuring apparatus according to the present invention. Reference numeral 41 denotes a distance measuring optical system unit incorporating a light emitting element 42 and a light receiving element 43, and 44 denotes a distance measuring optical system unit. A support shaft for rotatably supporting 41, a sector gear 45 fixed to the side of the distance measuring optical system unit 41, 46
Is a biasing spring that biases the distance measuring optical system unit 41 clockwise about the support shaft 44, 47 is a solenoid device,
48 is a plunger of the solenoid device 47, 49 is a lever rotatably provided on the center shaft 50, and is connected to the plunger 48 via a connecting member 51, and 52 is installed on both sides of the upper end of the lever 49 so as to face each other. A pair of stoppers,
53 is a driving claw fixed to a lever 49, and 54 is a lever 4
A return spring 55 for urging the driving pawl 9 and the driving pawl 53 counterclockwise about the central axis 50, and a plurality of ratchet teeth 5 55 rotatably provided on the central pawl 50 and engaging with the driving pawl 53.
Reference numeral 5a denotes a ratchet wheel formed on the periphery, and reference numeral 56 denotes a reversing stopper that engages with the ratchet teeth 55a to prevent the ratchet wheel 55 from reversing (in this embodiment, counterclockwise rotation).

FIG. 10 is an exploded perspective view of the upper structure of the ratchet wheel 55. A plurality of wheels 57 are fixed on the upper surface of the ratchet wheel 55 at intervals on a concentric circle.
Are formed on the center shaft 50 so as to be rotatable, and a connecting protrusion 58a which engages with the connecting claw 57 and a connector on which a pair of bosses 58b are formed;
0 is rotatably provided, a gear portion 60 meshing with the sector gear 45 is fixed at an upper portion, and a drive cylinder body is formed at a side portion with a groove 59a into which a connecting protrusion 58a and a boss 58b are vertically movably inserted. , 61 are pressing springs pressing the connector 58 toward the upper surface of the ratchet wheel 55, and 62 is the connecting projection 5
8a, the operation inclined portion 6 that raises the connector 58
A reset cam 2a is formed.

FIG. 11 is an exploded side view showing the lower structure of the ratchet wheel, and FIG. 12 is a structural view showing a main part of the lower structure of the ratchet wheel. 63 is engaged with the projection 49 a of the lever 49. A brake arm 63a and a brake claw 63b projecting therefrom, and a brake claw body 65 serving as an over-rotation prevention means rotatably supported on a shaft 64 is fixed to the lower surface of the ratchet wheel 55, It is a brake ratchet portion that engages with the portion 63b.

The reversing stopper 56 is provided with a biasing force in a direction in which the pawl portion enters the ratchet teeth 55a by a spring (not shown). Ratchet part 6
The biasing force is applied in a direction away from 5.

Next, the operation of the reference example having the above configuration will be described.

When the release operation is performed in the standby state shown in FIG. 9, the distance measuring optical system unit 41 rotates clockwise about the support shaft 44 as described later, and during that time, the light emitting element 42 emits light. The light reflected from the object is received by the light receiving element 43 to perform a known distance measurement, and the light emitted from the light emitting element 42 moves from one end of the shooting screen to the other end. As a result, a wide range of distance measurement is performed.

Specifically, when a release operation is performed,
When the solenoid device 47 operates, the plunger 48 is retracted, and the lever 49 and the driving claw 53 are rotated clockwise through the plunger 48 until they come into contact with the stopper 52.
The rotation of the driving claw 53 causes the driving claw 53 and the ratchet teeth 5 to move.
5a engages to rotate the ratchet wheel 55 clockwise. Then, the connection protrusion 58a of the connector 58 is pushed by one side of the connection claw 57 on the upper surface of the ratchet wheel 55, and the drive cylinder 59 is rotated clockwise through the boss 58b. The rotation of the drive cylinder 59 causes the sector gear 45 to rotate counterclockwise via the gear portion 60, and the distance measuring optical system unit 41 moves counterclockwise by 1 against the elastic force of the biasing spring 46. Step rotation will be performed.

FIGS. 13 (a) to 13 (d) are explanatory diagrams of the resetting operation. When the rotation operation of the optical system unit 41 is repeated for a predetermined number of steps, the connecting projection is formed by the connecting claw 57. When the part 58a is pushed, FIG.
The position moves from the position (a) to the position shown in FIG. 13B, and the connecting protrusion 58a comes into contact with the operation inclined portion 62a of the reset cam 62, and is moved upward by the operation inclination portion 62a to the groove 59a of the drive cylinder 59. It is pushed up and the inclined projection 57a of the connecting claw 57
(FIG. 13 (c)). Then, since the distance measuring optical system unit 41 is urged by the urging spring 46,
Under this biasing force, the sector gear 45 acts to return the drive cylinder 59, and the connection protrusion 58 a moves on the connection claw 57 together with the groove 59 a of the drive cylinder 59, and the inclination of the previous connection claw 57. The protrusion comes into contact with the projection 57a, receives the pressing force of the pressing spring 61, descends, and returns to the original standby state (FIG. 13D).

The number of steps in the reset operation is determined by the pitch of the ratchet teeth 55a of the ratchet wheel 55 and the pitch of the connecting claws 57.

In FIG. 12, a release operation is performed.
As described above, when the lever 49 rotates, the brake arm 63a of the brake claw body 63 initially comes into contact with the projection 49a of the lever 49 at a position close to the center axis 50 by receiving the elastic force of the spring. It is rotated counterclockwise about the axis 64 by the projection 49a. The rotation of the brake arm 63a caused by the rotation of the lever 49 causes the entire brake claw body 63 to rotate, and the brake claw 63b engages with the brake ratchet 65, so that the ratchet wheel 55 is prevented from over-rotating in each step rotation. Stop after a predetermined rotation.

As described above, the brake claw portion 63b is initially connected to the brake arm portion 63a and the projection 49a by the center shaft 50.
, And moves slowly, but as shown in FIG.
3a and the protruding portion 49a come into contact with each other at a position near the shaft 64, and move rapidly.

In FIG. 9, a reflection mirror 66 is disposed in front of the light receiving element 43, and the light receiving optical path 67 is bent to prevent the optical path from becoming long in the distance measuring optical system unit 41. A space for installing driving means including the gear 45, the solenoid device 47, the lever 49, the driving claw 53, the gear portion 60 of the driving cylinder 59, the ratchet wheel 55, and the like in the camera body can be effectively taken. Therefore, both the optical path 68 of the light-emitting element 42 and the optical path 67 of the light-receiving element 43 or one of the optical paths are bent in accordance with the specifications of the camera or the installation design of the driving means, thereby reducing the size and securing the space. Can be achieved.

FIG. 15 is a timing chart of each part of the reference example. When the release is turned on, the light emitting element 42 emits a plurality of light at predetermined intervals.
The solenoid device 47 is operated in synchronization with the light emission of the distance measuring optical system unit 41, and the rotation (A part) and the stationary state (B
) Is repeated, the distance is measured while the camera is stationary, and the distance measuring optical system unit 41 is reset (C) at the last step.

In the above-mentioned reference example, the distance measuring optical system unit 41 is returned to the standby position after rotating by a predetermined rotation angle, so that pre-focusing can be performed and multiple exposure can be performed. By appropriately bending the optical path of the light receiving element 43, it is possible to secure an installation space for each unit for driving the distance measuring optical system unit 41, without increasing the size of the entire camera, and to further divide the rotation into a plurality of steps. In addition, since the camera is stopped at each step, it can cope with a large number of flashes for the distance measurement and can accurately measure the distance. Accurate and reliable ranging is performed in time.

FIG. 16 is a block diagram showing the overall configuration of the second embodiment of the present invention. The second embodiment is different from the distance measuring optical system unit 41 in the reference example of FIG. 9 and the first embodiment of FIG. It is configured by connecting the drive system and the control system in the example.

In FIG. 16, members corresponding to those described with reference to FIGS. 1 and 9 are denoted by the same reference numerals and detailed description thereof is omitted. However, the structure of the second embodiment is more practical. Things.

[0052]

As described above, according to the present invention,
The range to be measured by the ranging optical system unit can be changed to single-point ranging or multi-point ranging, so that the ranging suitable for the photographer's intention is properly performed. When the release switch is turned on, no operation sound is generated because the distance measuring optical system unit does not operate, and the distance measurement by the operation of the distance measuring optical system unit is started by turning on the second-stage release switch. Since it is possible to prevent the photographer from misunderstanding that the shutter is released when the first-stage release switch is turned on, and to measure the distance to the subject by turning on the first-stage release switch at the time of one-point distance measurement. Then, a specific subject is immediately focused.

Further, at the time of one-point distance measurement in which the distance measurement is started by the operation of the first-stage release switch, focus locking is performed, so that a free photograph of a composition focused on a specific subject can be reliably taken. Can be.

Therefore, according to the invention described in each claim,
It is possible to provide a camera distance measuring device that can perform distance measurement appropriately and reliably according to the photographer's intention and has a large practical effect.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an entire configuration of a first embodiment of a camera distance measuring apparatus of the present invention.

FIG. 2 is an explanatory diagram of the shape of the cam of FIG.

FIG. 3 is an explanatory diagram showing a range to be measured in a finder corresponding to the cam shape of FIG. 2;

FIG. 4 is a timing chart according to a basic operation of multipoint ranging in the first embodiment.

FIG. 5 is a timing chart related to a switching operation between multi-point ranging and single-point ranging in the first embodiment.

FIG. 6 is a timing chart showing another example of the cam control method according to the first embodiment.

FIG. 7 is a timing chart showing the relationship between the operation of the first and second stage release switches and multipoint ranging.

FIG. 8 is a timing chart showing the relationship between the operation of the first and second stage release switches and the one-point distance measurement.

FIG. 9 is a configuration diagram showing a main part of a reference example of the present invention.

FIG. 10 is an exploded perspective view of the upper structure of the ratchet wheel of FIG. 9;

FIG. 11 is an exploded side view of the lower structure of the ratchet wheel shown in FIG. 9;

FIG. 12 is a configuration diagram showing a main part of a lower structure of the ratchet wheel shown in FIG. 9;

FIG. 13 is an explanatory diagram of a reset operation of the reference example.

14 is a configuration diagram of the structure of FIG. 12 during operation.

FIG. 15 is a timing chart of a main part of the reference example.

FIG. 16 is a configuration diagram showing an overall configuration of a second embodiment of the present invention.

[Explanation of symbols]

1, 41: Distance measuring optical system unit, 2, 42: Light emitting element, 3, 43: Light receiving element, 6: Distance measuring circuit, 7,
9, 11, 13, 14, 45, 47, 49, 53, 5
5, 58, 59, 60 ... driving means, 16 ... switching means,
19: first stage release switch, 20: second stage release switch, 21: photographing lens, 27: shutter unit, 32: control means, 62: reset cam,
63, 65: Over-rotation prevention means, 67, 68: Optical path.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshio Nakamura 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Inventor Daisuke Kishida 1-3-6 Nakamagome, Ota-ku, Tokyo Ricoh Co., Ltd. (56) References JP-A-60-217321 (JP, A) JP-A-59-107332 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02B 7 / 28-7/40

Claims (2)

(57) [Claims] A first stage release switch and a first stage
2nd stage release operated after release switch
A switch, a rotatable ranging optical system unit that moves from one end of the shooting screen to the other end to perform ranging, and a drive ranging device that rotates the ranging optical system unit. Multi-point ranging and one-point ranging for the ranging target range of the ranging optical system unit rotated / stopped by the driving unit
And switching Ru switching means to a distance measuring, the at the time multi-point range finding second
The operation of the step release switch allows the
Start the distance measurement, and at the time of one-point distance measurement,
A distance measuring device for a camera, comprising: control means for starting distance measurement by operation of a release switch . 2. The distance measuring optical system unit at the time of single point distance measuring.
2. The camera distance measuring apparatus according to claim 1 , wherein the distance is stopped by the operation of the switching means so that the distance can be measured.