JPH06154170A - Photographing device - Google Patents

Abstract

PURPOSE:To provide a photographing device by which a load applied to a motor can be reduced and springing-up of a reflecting mirror can be carried out in a short time. CONSTITUTION:In a photographing device which has a finder optical system having a reflecting mirror 12 and takes a photograph by carrying out respective operations continuously by one time rotation of a rotary member 32, an energyzing member to energize the reflecting mirror 12 in a retreat direction and a lever member 35 to retreat the reflecting mirror 12 to a retreat position by moving in the retreat direction by energizing force of this energizing member are provided. A locking member 37 is provided in the rotary member 32 so as to release stopping of movement of the lever member 35 when the rotary member 32 starts to rotate as well as to apply energizing force of the energizing member 15a applied to the lever member 35 in a rotational direction of the rotary member 32 after the reflecting mirror 12 is situated in a prescribed position in an optical path by stopping the movement of the lever member 35 while locking the lever member 35 when the rotary member 32 is put in an initial position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-shielding curtain provided in front of a photographing film, a finder optical system having a reflecting mirror retractable outside the optical path in front of the light-shielding curtain, and a photographing switch pressed. The present invention relates to a photographing device that is provided with a rotating member that makes one rotation by a drive motor for each rotation, and rotates the rotating member once to perform a series of operations to perform photographing.

[0002]

2. Description of the Related Art Conventionally, as a photographing device for photographing, for example, a fundus or the like, one shown in FIG.

In FIG. 14, reference numeral 1 denotes a reflecting mirror which jumps up to the position of a broken line at the time of photographing, and the reflecting mirror 1 is biased counterclockwise by a biasing member (not shown) and abuts the stopper member 2 to form an angle of 45 degrees. It is positioned.

Reference numeral 3 is a light-shielding device arranged in front of the photographic film 4, reference numeral 5 is a focus glass of a finder optical system, and reference numeral 6 is a cam which is rotated counterclockwise by a motor 7. The cam 6 is rotated once by a motor 7 every time a photographing switch (not shown) is pressed. Also cam 6
A large diameter portion 6a and a small diameter portion 6b are formed in the. Reference numeral 8 denotes a roller provided on the reflection mirror 1, which is adapted to engage with the cam 6.

Now, when the photographing switch is pushed and the motor 7 is driven, the cam 6 rotates counterclockwise. The boundary 6c of the cam 6 is engaged with the roller 8 of the reflection mirror 1 by the rotation of the cam 6, and this engagement causes the reflection mirror 1 to rotate clockwise against the biasing force of the biasing member as the cam 6 rotates. It is moved to the position shown in FIG. That is, the reflection mirror 1 is flipped up by the motor 7 to the retracted position outside the optical path.

While the large diameter portion 6a of the cam 6 is engaged with the roller 8, the reflection mirror 1 is held at the position shown in FIG. During this period, as the cam 6 rotates, each operation such as opening and closing of a light-shielding curtain (not shown) of the light-shielding device 3 and light emission of a strobe (not shown) is performed in series, and thereby photographing is performed. . After this, the roller 8 moves to the small diameter portion 6b of the cam 6.
, The reflecting mirror 1 rotates counterclockwise by the urging force of the urging member as the cam 6 rotates, and returns to the position shown in FIG.

When the reflecting mirror 1 returns to the position shown in FIG. 14,
A switch (not shown) is turned on, the drive of the motor 7 is stopped by this, and the cam 6 makes one rotation and returns to the initial position.

[0008]

By the way, in such a photographing apparatus, since the cam 6 is rotated by the motor 7 against the biasing force of the biasing member applied to the reflection mirror 1, the biasing member is biased. It has a drawback that the load applied to the motor 7 is increased by the amount of the power.

Further, when the motor 7 is started, it takes some time for the output of the motor 7 to reach the rated torque.
Therefore, the output of the motor 7 is not sufficiently obtained at the initial stage of starting the motor 7, and the biasing force of the biasing member is applied to the reflecting mirror 1, so that the reflecting mirror 1 can be flipped up more than necessary. It takes time.

As a result, the time lag from the pressing of the shutter switch to the execution of the photographing becomes long, and there arises a problem that a desired fundus image cannot be photographed particularly in the case of performing fluorescent photographing which is drastically changed.

The present invention has been made in view of the above problems, and it is an object of the present invention to reduce the load applied to the motor 7 and to bounce the reflection mirror 1 in a short time. It is to provide a photographing device.

[0012]

In order to achieve the above object, the present invention provides a light-shielding curtain which is provided in front of a photographic film and is opened and closed by operating an opening / closing lever, and can be retracted outside the optical path in front of the light-shielding curtain. A finder optical system with a reflection mirror and a drive motor every time the shooting switch is pressed
A rotary member that rotates, and each operation unit that performs each operation required for photographing is provided on the rotary member.
In an image pickup apparatus for performing a series of operations such as opening and closing of the light-shielding curtain by rotating the image pickup apparatus, an urging member for urging the reflecting mirror in the retreating direction, and an urging force of the urging member retreat. When the retracting member that moves in the direction and retracts the reflecting mirror to the retracted position and the rotating member are in the initial position, the retracting member is locked to stop the retracting member to move the reflecting mirror in the optical path. When the rotating member starts rotating, the stop of the movement of the retracting member is released and the biasing force of the biasing member applied to the retracting member is applied in the rotating direction of the rotating member. A locking member is provided on the rotating member.

[0013]

According to the present invention, according to the above-mentioned structure, the locking member is locked to the retracting member to stop the movement of the retracting member, thereby keeping the reflecting mirror at a predetermined position in the optical path. Then, when the rotating member starts rotating, the locking member releases the stop of the movement of the retracting member and applies the biasing force of the biasing member applied to the retracting member in the rotating direction of the rotating member.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a photographing apparatus according to the present invention will be described below with reference to the drawings.

In FIGS. 1 to 4, reference numeral 10 is a main body 10 of the photographing apparatus, and the main body 10 is provided with a film running mechanism (not shown). A mirror box unit 11 is provided in the main body 10, and the mirror box unit 11 is provided.
A reflection mirror 12 of a finder optical system is arranged inside. A light shielding device 60 is arranged behind the reflection mirror 12, and a film F is arranged behind the light shielding device 60. 80 is a film retainer, 82 is a back cover, and 83 is a focus glass of the finder optical system.

A shaft 13 is attached to the rear part of the reflection mirror 12, and both ends of the shaft 13 are mirror box parts 11.
The reflecting mirror 12 is attached to the side walls 11a and 11b, and can be retracted to the outside of the optical path by rotating about a shaft 13 as a fulcrum to a position shown by a chain line. 39 is a stopper. Axis 13
A rear end portion of a lever member (retraction member) 35 is rotatably supported at one end side (left side in FIG. 2) of the.

The lever member 35 includes an inclined portion from the tip side.
35a, a flat stop portion 35b, an inclined step portion 35c, and a flat sliding portion 35d are formed, and these serve as an engaging surface for engaging a pin 38 described later. A pin 36 is provided on the inner side surface 35e of the lever member 35.
It is in a state of being inserted on the lower surface side of.

As shown in FIG. 5, two springs 15a and 15b are attached to the shaft 13. One end of the spring 15a abuts the pin 36 of the lever member 35 as shown in FIG. Is in contact with the side wall 11c of the mirror box portion 11 and biases the lever member 35 in the clockwise direction. spring
As shown in FIG. 7, one end of 15b is in contact with the pin 36 of the lever member 35, and the other end is in contact with the upper surface of the reflection mirror 12 so that the reflection mirror 12 is pressed against the pin 36. Reference numeral 15c in FIG. 5 is a flange provided on the shaft 13, which is for preventing the springs 15a and 15b from interfering with each other.

On the side wall 11a of the mirror box portion 11 (see FIG.
(See), a stopper member 14 is attached, and the stopper member 14 is in contact with the lower surface of the tip of the reflection mirror 12. A drive motor 20 is attached to the lower portion of the side wall 11a of the mirror box unit 11, and the drive shaft of the drive motor 20 is attached.
The tip portion of 21 projects from the side wall 11a and the side wall 11a and the main body side wall 10
enters the gear chamber 30 formed between a and (see FIG. 2),
A gear 31 is attached to its tip. On the other hand, the side wall 11
A rotating member 32 is rotatably attached to the upper side of a, and a gear 33 having a roller (stop switch operating portion) R attached to one end side (left side in FIG. 2) of the rotating member 32.
Is attached, and this gear 33 and the gear 31 are reduction gears.
The rotation member 32 is rotated by the drive motor 20 being connected through 34a to 34c.

An arm member (locking member) 37 that rotates with the rotation of the rotating member 32 is integrally provided at the other end (right side in FIG. 2) of the rotating member 32, and a pin is provided at the tip of the arm member 37. 38 is provided, and the pin 38 is a lever member.
It engages with the stop 35b of 35 (see FIG. 1).

When the arm member 37 is in this state, the pin 36 of the lever member 35 is set to be separated from the lower surface of the reflection mirror 12, and the reflection mirror 12 has a spring 15a.
The urging force of is not applied. In this state, only the urging force of the spring 15b is applied to the reflection mirror 12, whereby the reflection mirror 12 is pressed by the stopper member 14 and positioned at an angle of 45 degrees as shown in FIG.

The arm member 37 is a rotating member driven by the motor 20.
It rotates in the counterclockwise direction with 32, and when this arm member 37 rotates to the position of the chain line, the reflection mirror 12 is flipped up to the retracted position shown by the chain line of FIG. 1 with this rotation.

As shown in FIG. 3, a curved arm lever 40 is arranged in the gear chamber 30 so as to overlap the upper peripheral end portion of the gear 33, and one end of the arm lever 40 is provided with a shaft 40a.
The arm lever 40 is pivotally supported by the side wall 11a by a stopper (not shown) so that the arm lever 40 does not rotate counterclockwise from the position shown in FIG.

On the inner curved surface of the arm lever 40, the gear 33
An engaging surface 41 is formed which engages with the roller R provided in FIG. 13 and rotates the arm lever 40 by θ in the clockwise direction (in FIG. 3) to move to the position shown in FIG. The arm lever 40 is held in the position shown in FIG. 13 while moving within the range. Further, the roller R is set to be engaged with the engagement surface 41 while the reflection mirror 12 is held at the position shown in FIG. 13 by the lever member 35.

A strobe switch 50 is provided on the arm lever 40.
Pin that turns on contact piece 51 of (strobe switch operation part)
42 is provided, and a protrusion 43 for moving the slide member 61 of the shutter device 60 upward as the arm lever 40 rotates is provided at the tip of the arm lever 40. The pin 42
Is for turning on the contact piece 51 of the strobe switch 50 when the arm lever 40 rotates by θ, that is, when the arm lever 40 moves to the position shown in FIG. The roller R, the arm lever 40, and the protrusion 43 form an opening / closing lever operation unit.

In FIG. 3, reference numeral 52 is a stop switch for stopping the drive motor 20. The stop switch 52 turns on the contact piece 53 when the roller R provided on the gear 33 is rotated to the position of the broken line, and the drive motor 20 is stopped. To stop. The stop switch 52 and the flash switch 50 are attached to the side wall 11a.

As shown in FIGS. 8 and 9, the shading device 60 comprises a shading frame 61 provided with a shading curtain 62 that can be opened and closed. The shading curtain 62 is composed of a plurality of shading plates 63. . Each of the light shielding plates 63 can be moved downward, and by this movement, the light shielding curtain 62 is opened to perform photographing.
The movement of each light shielding plate 63 is performed by the link mechanism 65, and when the opening / closing lever 66 having the protrusion 64 is moved in the arrow direction, each light shielding plate 63 is moved downward by the link mechanism 65,
When the opening / closing lever 66 is moved to the position shown in the figure, each light shielding plate 63 moves upward and the light shielding curtain 62 is closed.

Further, as shown in FIG. 10, a slide member 71 is provided on the left side (in FIG. 10) of the front surface of the light shielding frame 61 so as to be movable up and down, and this slide member 71 has an opening / closing lever 66. Clamping portions 72, 72 sandwiching the protrusion 64 provided on the are provided. Further, the slide member 71 is provided with elongated holes 73, 73 extending in the vertical direction, and the guide pins 74, 74 provided on the light shielding frame 61 are inserted through the elongated holes 73, 73 to make the slide member 71.
It is designed to guide the vertical movement of 71.

A protrusion 75 protruding forward is formed on the upper end of the slide member 71, and the protrusion 43 of the arm lever 40 is engaged with the protrusion 75, so that the arm lever 40 rotates clockwise. As a result, the protrusion 43 moves the slide member 71 upward. Further, a spring is provided between the rear end portion 76 of the slide member 71 and the pin 77 provided on the light shielding frame 61 below the rear end portion.
78 is provided, and the slide member is provided by the spring 78.
71 is always urged downward, and the opening / closing lever of the shading device 60
66 is set to the position shown in the figure to keep the light-shielding curtain 62 closed.

FIG. 11 is a block diagram showing the construction of a control system for controlling the light emission of the drive motor and strobe light.

In FIG. 11, reference numeral 101 is a strobe light emitting circuit for causing the strobe 102 to emit light, 103 is a drive circuit for driving the drive motor 20, and 104 is a control device comprising a microcomputer or the like, which is a strobe when the strobe switch 50 is turned on. The light emitting circuit 101 is operated to cause the strobe 102 to emit light, and the control device 100 includes the photographing switch 1
When 05 is pressed, the drive circuit 103 is activated and the drive motor 20
Drive circuit, and when the stop switch 52 is turned on, the drive circuit
The operation of 103 is stopped and the drive of the drive motor 20 is stopped.

Next, the operation of the image pickup apparatus configured as described above will be described.

Before the photographing switch 105 is pressed, the lever member 35, the arm member 37 and the gear 33 are at the positions (initial positions) shown in FIGS. 1 and 3, and the pin 38 of the arm member 37 stops the lever member 35. It engages with the portion 35b. Due to this engagement, the movement (counterclockwise rotation) of the lever member 35 due to the urging force of the spring 15a is stopped.

When the photographing switch 105 is pressed, the control device 1
The drive circuit 103 is actuated by 04, the drive motor 20 is driven, and the gear 31 rotates together with the drive shaft 21. This gear
The rotation of 31 causes the gear 33 to rotate in the clockwise direction (in FIG. 3) via the reduction gears 34a to 34c, and the rotating member 32 to rotate together with the gear 33.

The arm member 37 rotates clockwise (in FIG. 1) as the rotating member 32 rotates,
With the rotation of 37, the engagement of the pin 38 of the arm member 37 moves from the stop portion 35b of the lever member 35 to the sliding portion 35d via the step portion 35c. When the pin 38 reaches the sliding portion 35d, the stop of the movement of the lever member 35 is released, and the lever member 35 is rotated clockwise by the urging force of the spring 15a.
By this rotation, the pin of the lever member 35 comes into contact with the lower surface of the reflection mirror 12 to rotate the reflection mirror 12 clockwise.

When the arm member 37 is rotated to the position shown in FIG. 12, the reflection mirror 12 is flipped up to the retracted position outside the optical path. After that, the roller R provided on the gear 33 engages with the engaging surface 41 of the arm lever 40, and the arm lever 40
40 is rotated clockwise about the axis 40a.

Along with the rotation of the arm lever 40, the projection 43 provided at the tip of the arm lever 40 moves the slide member 71 upward. By moving the slide member 71 upward, the light blocking device 60
The lever 66 is moved upward and the light-shielding curtain 62 is opened. Then, almost at the same time when the light shielding curtain 62 is opened, the arm lever
Pin 42 of 40 turns on contacts 51, 51 of strobe switch 50. When the flash switch 50 is turned on, the control device 104
Activates the strobe light emitting circuit 101 to cause the strobe 102 to emit light.

Since the arm lever 40 is held at the position shown in FIG. 13 while the roller R provided on the gear 33 is in contact with the engagement surface 41, that is, while the roller R is moving within the range of α. The opening of the light shielding curtain 62 is held, and the fundus image is photographed on the film F. That is, shooting is performed. And
When the roller R passes through the engagement surface 41 and is released from the engagement, the arm lever 40 rotates counterclockwise, and the slide member 71 is moved downward by the spring 78. By this movement, the lever 66 of the shading device 60 moves downward, the shading curtain 62 is closed, and the photographing is completed.

When the arm member 37 moves from the position shown in FIG. 1 to the position shown in FIG. 12, the arm member 37 is rotated by the biasing force of the spring 15a via the lever member 35, and as a result, the motor 20 moves. Even if the output is insufficient at the initial stage of activation, the arm member 37 will move to the position shown in FIG. 12 in a short time. That is, the reflection mirror 12 is flipped up in a short time. As a result, the time from when the shooting switch 105 is pressed until the shooting is performed becomes short,
It is possible to capture a desired fundus image even when performing fluorescence imaging with drastic changes.

Further, since the reflecting mirror 12 is moved to the retracted position by the urging force of the spring 15a, the load applied to the motor 20 is small and the motor 20 can be miniaturized.

When the light-shielding curtain 62 is closed, the pin 38 of the arm member 37 abuts the inclined portion 35a of the lever member 35, as shown by the chain line in FIG. 12, and the arm member 37 rotates counterclockwise. The lever member 35 also rotates counterclockwise against the biasing force of the spring 15a. As the lever member 35 rotates, the reflection mirror 12 also rotates counterclockwise. this is,
This is because the spring 15b acts so as to press the lower surface of the reflection mirror 12 against the pin 36.

When the arm member 37 rotates to the position shown in FIG. 1, the reflecting mirror 12 abuts on the stop member 14 and the pin 38 is engaged from the inclined surface 35a to the stop portion 3.
Move to 5b. As a result, the pin 36 of the lever member 35 separates from the lower surface of the reflection mirror 12 against the urging force of the spring 15b, and as a result, the reflection mirror 12 does not receive the urging force of the spring 15a.

On the other hand, when the reflecting mirror 12 is rotated to the position shown in FIG. 1, the roller R provided on the gear 33 is rotated to the position indicated by the broken line, and the contact piece 53 of the stop switch 52 is turned on. When the stop switch 52 is turned on, the control device 104 causes the drive circuit 103
To stop driving the drive motor 20.
By this stop, the arm member 37, the lever member 35 and the gear 3
3 stops at the initial position shown in FIG. 1 and FIG.
2 will make one revolution.

By the way, the rotating member 32 is rotated at a high speed by the motor 20 to complete the photographing in a short time, but the arm member 37 is moved from the position shown by the chain line in FIG. 12 to the position shown by the solid line in FIG. Spring 15 when moving up
It will move against the bias of a. Then, this urging force acts as a brake that stops the high speed rotation of the rotating member 32. As a result, when the arm member 37 reaches the position shown in FIG.
This prevents 12 from colliding with the stopper 14.

[0045]

As described above, according to the present invention, the biasing member that biases the reflecting mirror in the retracting direction and the biasing member moves in the retracting direction to retract the reflecting mirror. When the retracting member for retracting to the position and the rotating member are at the initial position, the retracting member is locked to stop the movement of the retracting member to position the reflecting mirror at a predetermined position in the optical path, and the rotating member is rotated. A locking member provided on the rotating member for releasing the stop of the movement of the retracting member and applying the biasing force of the biasing member applied to the retracting member in the rotating direction of the rotating member when the member starts rotating. Therefore, the reflection mirror can be flipped up in a short time. Further, the load applied to the motor can be reduced, and further, the urging force of the urging member acts as a brake that stops the rotation of the rotating member, and the collision of the reflecting mirror with the stopper can be prevented.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a section of a mirror box provided in a main body of a photographing apparatus according to the present invention,

FIG. 2 is a sectional view taken along the line AA of FIG.

3 is a sectional view taken along the line BB of FIG.

FIG. 4 is a sectional view taken along the line CC of FIG.

FIG. 5 is an enlarged view of a peripheral portion of the spring shown in FIG.

FIG. 6 is an explanatory view for explaining a biasing direction of a retracting member,

FIG. 7 is an explanatory view showing a state in which the reflection mirror is pressed against the pin,

FIG. 8 is a rear view of the shutter device,

9 is a front view of the shutter device shown in FIG. 8, an explanatory view showing a rotated state of a reflection mirror,

FIG. 10 is an explanatory diagram of a shutter device,

FIG. 11 is a block diagram showing a configuration of a control system of the photographing apparatus, and an explanatory diagram showing an outline of a conventional photographing apparatus.

FIG. 12 is an explanatory view showing a state where the reflection mirror has jumped up to the retracted position,

FIG. 13 is an explanatory view showing a rotated state of the arm lever.

FIG. 14 is a side cross-sectional view showing a cross section of a mirror box provided in the body of a conventional imaging device,

FIG. 15 is an explanatory diagram showing a state where the reflection mirror has jumped up.

[Explanation of symbols]

 12 Reflective mirror 15a Spring (biasing member) 20 Drive motor 32 Rotating member 35 Retracting member (lever member) 37 Arm member (locking member) 62 Light-shielding curtain 66 Opening / closing lever F Shooting film

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hideo Hibashi 75-1 Hasunumacho, Itabashi-ku, Tokyo Topcon Co., Ltd.

Claims (1)

[Claims] 1. A light-shielding curtain provided in front of a photographic film and opened / closed by operating an opening / closing lever, a finder optical system in which a reflecting mirror retractable outside the optical path is arranged in front of the light-shielding curtain, and a photographing switch is pressed. 1 for each drive motor
A rotary member that rotates, and each operation unit that performs each operation required for photographing is provided on the rotary member.
In a photographing apparatus that performs a series of operations such as opening and closing of the light-shielding curtain by rotating to perform photographing, an urging member that urges in the retracting direction of the reflection mirror, and an urging force of the urging member retracts the urging member. The retracting member that moves in the direction to retract the reflecting mirror to the retracting position, and when the rotating member is in the initial position, the retracting member is locked to stop the retracting member from moving in the optical path. When the rotating member starts rotating, the stop of the movement of the retracting member is released and the biasing force of the biasing member applied to the retracting member is applied in the rotating direction of the rotating member. An imaging device, wherein a locking member is provided on the rotating member.