JP2837859B2 - Aperture device for electronic still camera - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an aperture device for an electronic still camera, and more particularly to an aperture device for an electronic still camera using a single aperture plate.

2. Description of the Related Art Conventionally known diaphragm devices include a so-called iris diaphragm type in which a plurality of diaphragm blades are rotated with a wheel to form a diaphragm opening, as is well known in the art. A plurality of aperture openings having different aperture diameters are sequentially drilled at equal intervals on a single disk or a single strip-shaped thin plate, and the apertures are moved on the exposure optical path in a turret type or a slide type to form an aperture. And a diaphragm plate moving type.

The iris diaphragm type has a complicated structure, a large number of parts, and a poor precision in forming an aperture diameter.
The above-mentioned diaphragm moving type has a merit that the aperture diameter accuracy is good and the structure is simple because a plurality of diaphragm apertures having different aperture diameters are previously formed in one thin plate. It is used favorably for cameras having a small screen size such as electronic still cameras. For example,
Japanese Patent Publication No.-125921 discloses a diaphragm plate moving type in which a plurality of diaphragm apertures having different aperture diameters are drilled at equal angular positions on one sector-shaped disc and driven in a turret type. The above-mentioned diaphragm device is applied to an electronic still camera. Japanese Patent Laid-Open Publication No. Sho 63-218929 discloses that the diaphragm aperture of the diaphragm plate moving type diaphragm device is arranged in large, small and large sizes. Technical means for preventing the occurrence of ghosts, flares, and the like on the photographing screen due to this are disclosed.

[Problems to be Solved by the Invention] However, in the diaphragm device of the diaphragm plate moving type, a plurality of diaphragm apertures having different aperture diameters formed in a single disk or a strip-shaped thin plate are usually equal to each other. The apertures are bored at the interval positions in ascending order of opening diameter, and the flat surface is arranged at the aperture opening position of the photographing optical path such that the aperture opening having the maximum diameter is located. For this reason, the diaphragm plate moves from the start of the release when the release button is pressed, and the diaphragm plate moves by the number of apertures at which a predetermined aperture value is automatically determined, or the aperture value is automatically determined by the number of aperture stages for which an appropriate aperture value is determined. It takes time for the aperture stop to be positioned on the shooting optical path, and there is a problem that the time lag from when the release button is pressed to when the actual shooting operation is started becomes long.

For example, in a diaphragm device in which five stages of apertures of F2.8, F4, F5.6, F8, and F11 are formed in a turret type disc in the same angular position in the order of aperture, the maximum aperture at the normally open aperture position is set. When an aperture with the smallest aperture value (F11) is selected from the aperture with the aperture (F2.8), the turret-type aperture disk rotates in one direction, requiring a large amount of aperture setting time. Will be. Further, if the diaphragm disk is rotated at a high speed in order to reduce the set time, there is a disadvantage that the stop accuracy for accurately stopping the selected diaphragm aperture on the photographing optical path is deteriorated.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an aperture device for an electronic still camera which can eliminate the above-mentioned drawbacks of the conventional aperture device and can shorten the time required for aperture setting.

[Means and Actions for Solving the Problems] An aperture device for an electronic still camera according to the present invention is provided such that any one of a plurality of predetermined aperture openings is selected corresponding to its own displacement position. An aperture device having an aperture selection member and a drive mechanism having a single drive shaft for driving the aperture selection member, wherein the aperture selection member has a first direction and a first direction. A plurality of aperture openings selecting portions for selecting the plurality of apertures are formed, and a position where these apertures are formed is provided. When the aperture selecting member is at a neutral position where the displacement amount in any of the first and second directions is substantially zero, an open aperture among these aperture selecting portions is formed at a position on the aperture selecting member. , Aperture at the same position The member defining the periphery is formed in a shape from which the member has been removed, and each of the other opening selecting portions is placed at a position sequentially selected in accordance with the displacement of the opening selecting member in the first direction and the second direction. The drive mechanism is characterized in that it is formed so as to be discretely arranged, and the drive mechanism is configured such that the aperture selection member is located at an appropriate position in a displacement transmission path from a driving force generation source to the aperture selection member as a moving object. A position regulating mechanism is provided to regulate the displacement of the member when the specific opening selecting section is in a position where it works effectively.

An aperture device for a single-lens reflex electronic still camera according to the present invention includes an aperture selection member provided so that any one of a plurality of predetermined apertures is selected in accordance with its own displacement position. A diaphragm device having a drive mechanism for driving an aperture selection member, wherein the aperture selection member has its own displacement in a first direction and a second direction different from the first direction. Along with being arranged so as to be allowed, a plurality of aperture selectors for selecting the plurality of apertures are formed, and among these aperture selectors, an open aperture is formed at a position on the aperture selector. The other aperture selectors are formed so as to be discretely arranged on the member at positions sequentially selected in accordance with the displacement of the aperture selector in the first direction and the second direction. To light the finder optical path A light transmitting portion is provided.

Hereinafter, the present invention will be described with reference to the illustrated embodiments.

FIG. 1 is an exploded perspective view of a diaphragm device showing a first embodiment of the present invention. In this embodiment, a galvanometer is used as a diaphragm driving source, and a driving mechanism is operated by this to drive a diaphragm plate as an aperture selecting member.

The galvanometer 1 is a well-known one, and has a short cylinder inside, and a semi-cylindrical portion is excited with an N-pole and the other semi-cylindrical portion is excited with an S-pole, and the output rotation shaft 1a is fixed at the center. It has an actuator and one or two drive coils disposed around the actuator, and is mounted on the back surface of the drive source mounting board 2 by appropriate means. An aperture plate 3 is disposed at a predetermined interval in front of the substrate 2, and an aperture plate 4 and a driving mechanism are disposed between the aperture plate 3 and the substrate 2.

The aperture plate 3 is formed of a vertically long strip-shaped plate, and an aperture 3a having an aperture opening diameter is formed in the lower central portion thereof, and the aperture 3a is disposed on the photographing lens optical axis O. It is arranged so that the central part is located.
The aperture plate 3 is integrally fixed to the substrate 2 fixed to a stationary member (not shown) by a positioning pin 5 and a support shaft 6. That is, a mounting hole 2a for fitting the base of the pin 5 is formed in the upper center of the substrate 2, and the base of the support shaft 6 is implanted in the lower center. At the tip of the positioning pin 5 in which the base having the flange 5a is fitted in the hole 2a and the tip of the support shaft 6,
The aperture plate 3 is fitted into the mounting holes 3b and 3c, and attached with retaining rings 7 and 8, respectively, to be integrated with the substrate 2.

The drive mechanism penetrates through an opening 2b drilled above the support shaft 6 of the substrate 2 and extends rearward, is fitted to the output rotation shaft 1a of the galvanometer 1, and is integrally attached to the coaxial 1a. A large-diameter transmission shaft 9, an output gear 10 integrally attached to the end of the transmission shaft 9, and a drive gear rotatably fitted to the support shaft 6 and meshing with the output gear 10.
It is composed of 11 and. In addition, the drive mechanism includes an urging mechanism that regulates the aperture plate 4 serving as an aperture selection member to a neutral position (neutral position) in a normal state and returns the aperture plate 4 to the neutral position after photographing is completed. Have been.

The biasing mechanism includes an arm 12 extending upward from the front surface of the output gear 10 and a regulating pin 13 extending rearward in parallel with an optical axis having a base fixed to a distal end of the arm 12. The transmission shaft 9 is wound in the middle, one end 14a is pressed against the right side of the restriction pin 13, and then pressed against the right side of the positioning pin 5, and the other end 14b is connected to the restriction pin 13
And a torsion spring 14 which is stretched over the left side of the positioning pin 5 after being pressed against the left side. That is, in the neutral position, the torsion spring 14 and the positioning pin 5 form a press-contact state.

The aperture plate 4 serving as the aperture selection member is integrally attached to the distal end surface of the drive gear 11 via an attachment member 15. The aperture plate 4 has a front shape of FIG. 2 (A).
As shown in FIG. 5, the mounting member 15 is formed of a horizontally-long circular thin plate whose center is lifted up and deformed, the center of which is rotatably inserted into the support shaft 6, and which is fixed to the back surface. , And is integrally fixed to the drive gear 11. The diaphragm plate 4 has a position on an arc O ₁ (see FIG. 2) drawn with a radius connecting the center of the support shaft 6 and the optical axis O located immediately below the support shaft 6. Aperture openings 4a and 4b are formed at right and left positions at an equal angle with respect to the optical axis O about the axis 6. That is, the aperture opening 4a drilled at the right position has, for example, the aperture 3a having a fully-open aperture diameter while the aperture 3a is formed to have a fully-opened aperture diameter, and an aperture diameter having an aperture diameter set by two steps. Further, the aperture 4b formed at the left position is formed as an aperture having an aperture diameter capable of setting an F value further reduced by two steps.

Further, the rotational position of the diaphragm plate 4 is regulated by a stopper pin 16 integrated with the diaphragm plate 4 and a partially arcuate stopper groove 17 formed in the aperture plate 3. That is, the diaphragm plate 4 is located at a position near the center of the diaphragm plate 4.
The stopper pin 16 integrated with the stopper slot 17
When the stop plate 4 rotates and the center of the one stop opening 4a coincides with the optical axis O, the stop plate 4 hits one inner end wall of the stopper groove 17 and rotates further. And the diaphragm plate 4 rotates in the opposite direction, and the other diaphragm opening 4b
When the center of the aperture plate 4 coincides with the optical axis O, the stopper pin 16 hits the other inner end wall of the stopper slot 17 to prevent the diaphragm plate 4 from rotating further. Although not shown, a vibration absorbing member or the like may be provided on both inner end walls of the stopper slot 17 or on the outer peripheral surface of the stopper pin 16 for absorbing a bounce or vibration generated when the two meet.

Next, the operation of the aperture device of the first embodiment thus configured will be described with reference to FIGS. 2 to 4. In FIGS. 2 to 4, FIG. B) shows the operation of the torsion spring 14, and (C) shows the galvanometer 1.
Respectively show the operation of the actuators.

First, as shown in FIGS. 2 (A), 2 (B) and 2 (C), the diaphragm plate 4 is held at the neutral position because the torsion spring 14 of the urging mechanism is in an equilibrium state. Is in the fully open state by the aperture 3a.

Next, in order to select the aperture 4a having an aperture diameter reduced by about two stages from the fully opened state, the galvanometer 1 needs a predetermined current for rotating the aperture plate 4 clockwise around the support shaft 6. It is good to flow. When this current is supplied, the galvanometer 1 rotates the actuator counterclockwise as shown in FIG. 3 (C), so that the output gear 10 and the regulating pin 13 also rotate counterclockwise. The other end 14b of the torsion spring 14 is pushed open counterclockwise against its own elasticity (see FIG. 3B). At the same time, the driving gear 11 is rotated clockwise around the support shaft 6 by the output gear 10,
The aperture plate 4 integral with the rotation 11 also rotates clockwise around the support shaft 6. When the center of the aperture 4a coincides with the optical axis O,
At this time, since the stopper pin 16 abuts against one inner end wall of the stopper slot 17, further rotation of the diaphragm plate 4 is restricted, and as shown in FIG. Located on the axis O, the aperture of the photographing optical path is set to an aperture value that is two steps smaller than the fully opened aperture. Then, after the photographing is completed in this set aperture state, when the supply of current to the galvanometer 1 is stopped, the regulating pin 13 is moved by the rebound elasticity of the torsion spring 14.
Is returned to the initial position, so that the actuator of the meter returns to the inoperative state shown in FIG. That is, the output gear 10 rotates clockwise. When this rotates, the drive gear 11 and the diaphragm plate 4 also rotate counterclockwise to rotate backward, the diaphragm plate 4 returns to the neutral position, and the photographing optical path is in the fully opened state, as shown in FIG. become.

When the aperture 4b having the minimum aperture is selected, the aperture plate 4 is attached to the drive coil of the galvanometer 1 by the support shaft 6.
It is sufficient to supply a predetermined electric current for rotating counterclockwise around. When this current is supplied, the actuator of the galvanometer 1, the diaphragm plate 4, and the torsion spring 14 are operated in the completely opposite directions to those when the diaphragm opening 4a is selected, as shown in FIGS. 4 (A), 4 (B) and 4 (C). To position the aperture opening 4b on the photographing optical path. And this minimum aperture
When the current supplied to the galvanometer 1 is cut off after the photographing is completed in the setting state of 4b, the actuator, the diaphragm plate 4, and the torsion spring 14 operate in the opposite direction to the above setting operation, and FIG. Return to the initial state.

As described above, according to the first embodiment of the present invention, since the desired aperture is selected with the shortest distance, it does not take much time to set the aperture, and the release time lag can be reduced.

Further, the diaphragm device configured as in the first embodiment is
It is most suitable for an electronic still camera and is particularly effective. That is, the screen size of an electronic still camera is extremely small, as compared with a normal camera screen size using a silver halide film (24 mm × 36 mm), because of the use of an image pickup device such as a CCD. What is called size is 4.8 x 6.4 (mm), what is called 2/3 inch size is about 6.6 x 8.8 (mm), and the latitude is extremely narrow, so the depth of field is deep, so The number of diaphragm stages may be small, and approximately three diaphragm stages with a fully open diaphragm are sufficient as in the first embodiment. In addition, since the CCD itself, which is an image sensor, has an element shutter function of performing on / off operations, a wide range of exposure control can be performed by using the element shutter function and the number of aperture stages. Instead, the latitude is narrow,
The aperture diameter accuracy of the aperture is required. In this regard, since the aperture in the present embodiment can be manufactured so that one aperture plate 4 has a predetermined aperture diameter in advance, the aperture diameter precision becomes extremely high, and this requirement is sufficiently satisfied. I can respond. As described above, when the aperture device of the first embodiment is applied to an electronic still camera, the best effect is exhibited.

Next, a diaphragm device according to a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, a DC (direct current) motor 21 is used as a drive source, and four aperture openings 24a to 24d are formed in an aperture plate 24, and a position detecting mechanism for detecting a rotational position of the aperture plate 24 is provided. In addition, the stopper pin 16 and the stopper slot 17 are eliminated, and a stop plate stopping mechanism using a locking magnet 25 is newly provided. The rest of the configuration is exactly the same as that of the aperture device of the first embodiment, and therefore the same members are denoted by the same reference numerals and description thereof will be omitted.

The aperture openings 24a to 24d formed in the aperture plate 24 are provided at the positions where the aperture openings 4b of the first embodiment are formed, and the aperture openings 24a having an aperture diameter one step smaller than the aperture 3a of the fully opened aperture opening.
An aperture 24b having an aperture diameter one step narrower from the aperture 24a is formed at the position of the aperture 4a of the first embodiment, and an aperture 24c having an aperture diameter further reduced by one step from the same aperture is formed as an opening 24b. At the position next to
A minimum stop opening 24d having an opening diameter one step narrower than the above is formed next to the opening 24a. Accordingly, the number of aperture stages in this aperture device is determined by the aperture forming the open aperture.
With 3a, the number of diaphragm stages is five. Each of the aperture openings 3a, 24a to 24d is formed at an equiangular position about the support shaft 6.

On the other hand, the position detection mechanism is configured by an optical encoder that detects the rotation angle of the output gear 10. That is, a detection gear 22 meshing with the output gear 10 and a photo-interrupter 23 composed of a light-emitting element and a light-receiving element disposed on both sides of the rotation path of the teeth of the gear 22, respectively. I have. In addition, the diaphragm plate stopping mechanism includes:
A locking lever 19 having a fulcrum pivotally mounted on a support shaft 18 disposed in parallel with the optical axis O, and a lever 19 disposed opposite to one arm end of the lever 19 to attract and release the lever 19. Control magnet 25
And a locking claw 20 formed on the other arm of the lever 19 and positioned below the drive gear 11. The large-diameter transmission shaft 9 is fitted to the output shaft 21a of the DC motor 21, and is integrated with the coaxial 21a.

In the thus constructed diaphragm device of the second embodiment, since the flat plate is not energized to the motor 21, the diaphragm plate 24 is held at the neutral position by the equilibrium elasticity of the torsion spring 14, so that the open diaphragm diameter is reduced. Aperture 3a is located on the imaging optical path.

Next, when selecting the aperture 24a or 24d,
The output shaft 21a of the motor 21 is rotated clockwise to rotate the aperture plate 24 in the counterclockwise direction (in FIG. 5). Then, the output gear 10 also rotates clockwise,
The drive gear 11 and the aperture plate 24 rotate counterclockwise.
At this time, the detection gear 22 also rotates counterclockwise, and its teeth interrupt the detection optical path of the photointerrupter 23. Accordingly, an optical pulse is thereby obtained, and when a predetermined number of pulses are counted, the stop plate stopping mechanism is activated. That is, the magnet 25 is excited at the time of counting pulses when the aperture 24a or 24d is positioned on the photographing optical path. Then, the locking lever 19 is attracted and swings,
The locking claw 20 engages between the teeth of the drive gear 11. At the same time, the power supply to the DC motor 21 is cut off. In this way, the aperture 24a or 24d can be selected and set on the photographing optical path. Then, after the shooting, the magnet
Release the excitation to 25. Then, as described in the first embodiment, the restricting pin 13 and the output gear 10 rotate clockwise, and the aperture plate 24 and the drive gear 11 rotate counterclockwise, respectively, as described in the first embodiment. To return to the neutral position in the initial state.

When the aperture 24b or 24c is selected, the operation is the same as described above, except that the rotation direction of each member is reversed.

As described above, also in the aperture device of the second embodiment, since the operation of setting the selected aperture aperture on the photographing optical path is performed at the shortest distance, the time lag from the release can be reduced. Further, in the second embodiment, since the DC motor is used as the drive source, the apparatus can be configured at low cost.
However, if the power consumption is known to be large, a stepping motor with high stopping accuracy may be used. When a stepping motor is used, the rotating position can be held by the holding force and the detent force in both the energized state and the non-energized state, so that the stop plate stopping mechanism and the neutral holding mechanism are unnecessary.

In the first and second embodiments, the aperture 3a forming the open diameter when the diaphragm is fully opened is provided in the aperture plate 3 which is a separate member from the diaphragm plates 4 and 24. The aperture at the open aperture position (neutral position) has a shape that largely escapes from the opening 3a. Therefore, even if there is a positional shift such as gear backlash at the neutral position of the aperture plate, there is a problem in aperture performance. And an accurate full-open state is always obtained. Further, at the time of the stop other than the opening, a predetermined stop opening of the stop plate serving as the stop setting member is arranged on the photographing optical path so as to overlap with the open stop opening, and this setting opening is smaller than the open stop aperture. Therefore, even if a slight displacement occurs, there is almost no influence on the performance.

In both the first and second embodiments, the restoring force of the torsion spring accumulated at the time of setting the aperture opening is used as the restoring force of the aperture plate to the initial position (neutral position).
No special power source is required for this return force, and energy can be saved.

FIG. 6 shows a modified example of an elastic member for obtaining the above-mentioned restoring elasticity and for positioning the aperture plate at the neutral position. In each of the above embodiments, a torsion spring is used, but in this embodiment, a contractible coil spring 14A is used. That is, a pinching coil spring 14A is stretched over the pin 26 fixed above the center axis of the front surface of the output gear 10 and the positioning pin 5. Even when the elastic member is used in this manner, the flat plate is positioned at the neutral position in the normal state, and at the time of setting the aperture, the coil spring 14A is stretched in the rotating direction of the output gear 10 and the restoring elasticity is accumulated, so that the torsion is set. Acts exactly the same as the spring 14.

FIG. 7 shows still another modification for obtaining the above-mentioned restoring elasticity and keeping the aperture plate at the neutral position. In this example, the regulation pin 13 is used. That is, a groove 27 having a partial arc shape is provided on the rotation locus of the restriction pin 13 so that the restriction pin 13 can move in the groove 27, and the left and right of the restriction pin 13 Are provided with coil springs 14B ₁ and 14B ₂ having the same extension elasticity. Even with such a configuration, the same operation as in the above embodiments can be performed.

FIG. 8 shows still another modification for obtaining the above-mentioned restoring elasticity and disposing the aperture plate at the neutral position. This modification uses a magnetic force. That is, instead of the regulating pin 13 is provided integrally with partial arc-shaped arms 13A _1, 13A ₂ to the left and right on the tip portion of the arm 12. Each of the distal ends of both arms 13A ₁ and 13A ₂ has one N pole and the other S pole.
The magnets 28A ₁ and 28A ₂ are magnetized so as to be poles and have opposite magnetic poles opposed to both ends. Even with this configuration, Hirao has magnets 28A ₁ and 2
Neutral position by the distal end of the arm 13A _1, 13A ₂ are respectively sucked into 8A ₂ is held, at the time of aperture setting arm
Since the attractive magnetic force acts in the direction opposite to the rotation direction of the arm 12, the restoring force of the arm 12 is accumulated by this.

Next, FIGS. 9 to 11 show modified examples of the stop mechanism of the aperture plate in the first embodiment. In the modified example shown in FIG. 9, a fulcrum of a propeller-like stop lever 29 is supported on the output rotation shaft 1a of the galvanometer 1, and one end of the stop lever 29 is brought into contact with a stop opening set position of the stop plate. The stop members 30A ₁ and 30A ₂ that are in contact with each other are provided. Even with this configuration, the same function as the stop mechanism including the stopper pin 16 and the stopper slot 17 can be achieved. Also,
The stop mechanism shown in FIG. 10 utilizes a regulating pin 13 and has stopper pins 31A ₁ , 31A ₂ on the rotation path of the pin 13 at which the pin 13 abuts at the aperture opening set position of the aperture plate.
The stop mechanism shown in FIG. 11 uses the diaphragm plate 4 itself, and the stopper pin 32 directly contacts the diaphragm plate 4 at the diaphragm opening setting position of the diaphragm plate 4.
A ₁ and 32A ₂ are provided. It goes without saying that the stop mechanism does not change even with this configuration.

Next, FIGS. 12A to 12F show modified examples of the aperture plate. The aperture plate shown in FIG. 12 (A)
34, a diaphragm aperture 34a having an open diaphragm diameter is formed in the same plate, and aperture apertures 34b and 34c having different numbers of stages of aperture reduction on both sides thereof.
And a diaphragm plate 35 shown in FIG. 12 (B).
Is the same as that used in each of the above examples,
When stopped at the neutral position, the portion where the aperture stop 3a having an open aperture diameter formed on a separate member is located is largely cut out in a concave shape, and the opening diameter is formed on both left and right portions of the concave shape. Different aperture openings 35a and 35b are respectively formed. The aperture plate 36 shown in FIG. 12 (C) is formed of a disk, and the open aperture aperture 36a is, for example, F2.8, and the aperture aperture 36b of F4 and the aperture aperture 36c of F5.6 are provided on both sides thereof. Aperture aperture 36d of F8 on both sides
Aperture apertures 36e for F11 and F11, respectively
It is formed to be a step. In this case, if the aperture diameter is too small, a diffraction phenomenon occurs, which is optically unfavorable, so the ND filter 37 is added to the aperture 36e,
Originally, it is desirable to prevent this by substituting the aperture for F11 with a smaller aperture diameter.

Also, the aperture plate 38 shown in FIG. 12 (D) has a shape of the aperture openings 38a and 38b such that the aperture plate 38a and 38b are not affected by the area of the aperture opening even if the plate bounces slightly at the aperture setting position and stops. It is formed in an oval crossing the center of the aperture 3a.

Further, a diaphragm plate 39 shown in FIG. 12 (E) has a diaphragm aperture formed so as to be suitable for use in a single-lens reflex camera. That is, as is well known, a single-lens reflex camera uses a part of a photographing optical system for a finder optical system, and a diaphragm device is disposed in an optical path of the photographing optical system,
During normal viewfinder observation, the aperture is set to the open aperture position so that the viewfinder optical path does not become dark. Therefore, when the aperture device according to the present invention is applied to the single-lens reflex camera configured as described above, the finder optical path is momentarily darkened by the non-opening portion of the aperture plate while moving from the aperture opening to the next aperture opening at the time of setting the aperture. This causes the problem that Drawing plate of Fig. 12 (E)
39 is a solution to this problem.
The aperture openings 39b and 39c formed on both sides of the opening are connected to each other by a lightening hole 39d formed of a thin slot. In this way, the darkening of the finder optical path can be reduced, and the subject image can always be observed well even when the aperture is set. Also the above hole 39d
Is not limited to the narrow slot as described above, and may be formed by a number of small holes, such as a diaphragm plate 39A shown in FIG. 12 (F). It is needless to say that anything similar to this can be used.

In the above embodiment, the aperture stop is located at the neutral position of the aperture plate so that the aperture stop is located on the photographing optical path. It is not something to be done.

[Effects of the Invention] As described above, according to the present invention, an aperture plate having different aperture diameters is provided on both sides of an aperture located on a flat optical path and a shooting optical path. Since the aperture plate is rotated clockwise and counterclockwise to set the desired aperture at the shortest distance, the aperture can be set in a minimum time, and therefore, the time lag required for setting the aperture from the release can be reduced. Thus, it is possible to provide an aperture device in which the conventional drawbacks of this type of aperture device have been successfully removed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a diaphragm device showing a first embodiment of the present invention, FIGS. 2 (A), (B), (C) and FIGS. 3 (A), (B), (C).
4 (A), 4 (B), and 4 (C) are enlarged front views of main parts showing respective operating states of the diaphragm plate, the torsion spring, and the actuator of the galvanometer in the diaphragm device of the first embodiment. FIG. FIG. 6 is an exploded perspective view of a diaphragm device showing a second embodiment of the present invention. FIG. 6 is a perspective view showing a modification of a means for holding a diaphragm plate at a neutral position and obtaining restoring elasticity. The figure also holds the diaphragm plate in the neutral position,
FIGS. 9, 10 and 11 are enlarged front views of main parts and a front view of main parts, respectively, showing modified examples of the means for obtaining restoring elasticity. FIGS. FIGS. 12A to 12F are front views each showing a modification of the diaphragm plate. 1 Galvanometer (drive source) 3a Open aperture 4,24,34,35,36,38,39 ... Aperture plate (aperture selection member) 4a, 4b, 24a-24d ... Aperture aperture 34a-34c, 35a, 35b …… Aperture apertures 36a to 36e, 38a, 38b …… Aperture apertures 39a to 39c …… Aperture apertures

Claims (3)

(57) [Claims] An aperture selecting member provided to select one of a plurality of predetermined apertures corresponding to its own displacement position, and a single aperture driving member for driving the aperture selecting member. A stop mechanism having a drive mechanism having a drive shaft, wherein the aperture selecting member is allowed to displace itself in a first direction and a second direction different from the first direction. And a plurality of aperture selection sections for selecting the plurality of apertures are formed, and the formation positions thereof are such that the aperture selection member is displaced in any of the first and second directions. When the amount is substantially in the neutral position where the amount is substantially zero, an open aperture is formed at a position on the aperture selecting member among these aperture selecting portions, and a member defining the periphery of the aperture opening is removed at the same position. And each of the other aperture selectors is An aperture for an electronic still camera, wherein the aperture is formed so as to be discretely arranged at a position sequentially selected in accordance with the displacement of the aperture selecting member in the first direction and the second direction. apparatus. 2. The driving mechanism according to claim 1, wherein the opening selecting member effectively acts at a proper position in a displacement transmission path from a driving force generating source to the opening selecting member as a moving object. 2. The diaphragm device for an electronic still camera according to claim 1, further comprising a position regulating mechanism for regulating a displacement of the member when in the position. 3. An aperture selecting member provided to select one of a plurality of predetermined apertures corresponding to its own displacement position, and a driving mechanism for driving the aperture selecting member. Wherein the aperture selecting member is disposed such that its own displacement is allowed in a first direction and a second direction different from the first direction, A plurality of aperture selectors for selecting the plurality of apertures are formed, and among these aperture selectors, an open aperture is formed at a position on the aperture selector, and each of the other aperture selectors is the first aperture selector. The aperture selecting member is formed so as to be discretely arranged at positions sequentially selected in accordance with the displacement of the opening selecting member in the direction and the second direction, and a light transmitting portion for clearing a finder optical path is provided between the aperture openings. Single-lens reflex electronics characterized by the provision Aperture device for still camera.