JPH01200236A - Shutter device - Google Patents

Abstract

PURPOSE:To obtain a shutter device whose structure is simple by making a shutter curtain light and making a stopper absorb the motional energy of the shutter curtain completely. CONSTITUTION:An electromagnet 20 attracts an armature 22a according to a shutter release signal and a member 22 turns against a spring 26, then an engaging part 22b presses a spring hook 23a and turns a locking member 23 so as to disengage leading edge of the member 23 from the tailing part 5a of a 1st curtain 5. The 1st curtain 5 is rapidly turned with centering around a shaft 7 counterclockwise by a spring 10 and the turning of the 1st curtain stops at the time when a projecting pin 5b of the tailing part 5a of the 1st curtain 5 collides with the buffering body 14a of the stopper 14. Since the pin 5b collides with the soft buffering body 14a, it does not spring back, so that the motional energy of the 1st curtain is completely absorbed as the deformation energy of the stopper 14 with the buffering body 14a and the motional energy of the fine turning of the stopper 14 and the 1st curtain immediately stops without vibration. A brake mechanism, etc., are not necessitated and noises by vibration is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shutter device for a camera, and particularly to a shutter device suitable for an electronic still camera equipped with a solid-state image sensor.

[Prior Art] As is already known, the electronic still camera developed and sold by the applicant several years ago uses a magnetic recording medium as an image carrier instead of a silver halide film. The photographed image of the subject is recorded on the magnetic recording medium not as an image caused by a chemical reaction but as an image caused by magnetic change. Therefore, a solid-state image sensor for converting an optical image into an electrical image signal is placed at the focal point of the optical system in the camera, and the light that has passed through the optical system such as a lens is incident on the solid-state image sensor. It has become.

[Problems to be Solved by the Invention] The above-mentioned known electronic still camera does not require a film feeding mechanism like the known silver-salt film camera, so it has the advantage that it can be made lighter and smaller, and can also be used as an electronic information device. It has many advantages as a.

In the electronic still camera mentioned above, the area of the optical image forming surface is much smaller than that of the known silver halide film camera.
A shutter with a very small diameter is also suitable, and a rotary shutter device suitable for small diameters is used.

Conventionally, rotary shutter devices installed in electronic still cameras have been equipped with a brake mechanism that uses friction to prevent the shutter curtain from bouncing when it collides with a stopper. Due to the complexity of the structure, an increase in costs was inevitable. Furthermore, since the operation of the brake mechanism is unstable, there is a possibility that the operation of the shutter device may also become unstable.

'Therefore, an object of the present invention is to provide a shutter device that does not require a brake mechanism as described above.

[Means for Solving the Problems] The shutter device according to the present invention has an integrally molded lightweight shutter base, and a stopper for stopping the rotation of the shutter curtain completely absorbs the kinetic energy of the shutter curtain. It is characterized by having a structure that allows it to be absorbed. In the shutter device according to the present invention, the stopper for stopping the rotation of the shutter curtain is made of a spring material that can be elastically deformed, and the stopper is configured to slightly rotate around its own pivot point. The stopper is pivotally attached to the device frame or the like, and a buffer made of a stretchable and flexible material is attached to the portion of the stopper that collides with the shutter curtain.

On the other hand, since the shutter base is integrally molded to be lighter than conventional shutter bases, it has less kinetic energy than conventional shutter bases, and therefore, the shutter base can be stopped by the stopper without bouncing.

[Function] In the shutter device of the present invention, the shutter curtain is lightweight, and the stopper has a structure that can completely absorb the kinetic energy of the shutter curtain, so the structure is simple and does not require a friction brake mechanism. can provide a low-cost shutter device.

[Example] An example of the present invention will be described below with reference to the drawings. 1 is a front view of the shutter device of the present invention showing the state before the start of exposure operation, FIG. 2 is a cross-sectional view taken along arrows II-II in FIG. 1, and FIG. 3 is a sectional view taken along arrows III-III in FIG. 1. 4 is a sectional view, FIG. 4 is a front view after the start of the exposure operation, and FIG. 5 is a front view at the end of the exposure operation.

In FIGS. 1 to 5, reference numeral 1 denotes a solid-state imaging device consisting of a CCD (charge-coupled device) area sensor, and the device 1 is attached to a base plate 3 supporting a shutter mechanism, which will be described later. A cover 4 covers the shutter mechanism and the entrance surface of the element 1, and the cover 4 is fastened to the base plate 3. A filter 2 for adjusting the sensitivity of the element 1 is arranged at a position facing the light incident surface of the element 1, and the filter 2 is fixed to the cover 4.

The solid-state image sensing device 1 has a light receiving portion 1a in its center, and a positioning hole 1b and a recess IC are formed in the outer peripheral edge of the device 1, as shown in FIGS. 1 and 3. There is.

On the other hand, as shown in Figs. 1 and 3, there are holes 1 in the main plate 3.
A boss 3a to be inserted into the recess 1c and a protrusion 3b to be inserted into the recess 1c are formed.

When attaching the solid-state image sensor 1 to the base plate 3, as shown in FIG. The element 1 is fixed to the base plate 3 by pressing the plate spring 17 that presses the base plate 3 against the back surface of the element 1 and fastening the chain plate spring 17 to the base plate 3 with screws 40.

The shutter mechanism includes integrally molded front curtains 5 and rear curtains 6 which are rotatably fitted to @7 fixed to the main plate 3, and the front curtains 5 and rear curtains 6 are connected to shafts 7 in FIG. tear springs 10 and 11 that are biased clockwise around , various members described below that control the locking and release of the leading curtain 5 and trailing curtain 6, and rotation of the leading curtain 5 and trailing curtain 6. It has a stopper for setting the end position.

The front curtain 5 and the rear curtain 6 have a main part that moves in front of the solid-state image sensor 1, and have pressure parts 5a and 6a located at symmetrical positions with respect to the main part with an axis 7 between them. As shown in FIGS. 1 and 2, a bottle 5b is protruded from the pressure part 5a of the leading curtain 5, and bottles 6b and 6C are protruded from the pressure part 6a of the rear curtain 6.

As shown in FIG. 2, spring hooks 8 and 9 in the form of an X ratchet wheel are respectively fitted to both ends of the shaft 7 so as to be rotatable relative to the shaft 7. Detent members 12 and 13 made of leaf springs are fixed to the base plate 3 and have end locking portions that engage between the claws on the outer peripheral surface of each spring hook 8 and 9.
and 13 prevent the spring hooks 8 and 9 from rotating clockwise.

10 and 11 connect the front curtain 5 and the rear curtain 6 to the shaft 7 in FIG.
This is a spring that is biased counterclockwise around . One end of the spring 10 is engaged with the spring hook 8, and the other end of the spring 10 is engaged with the pin 5b of the leading curtain 5, and the pressure part 5a of the leading curtain 5 is rotated as shown in FIG. It is biased clockwise.

Also, one end of the spring 11 engages with the spring hook 9, and the spring 11
The other end engages with a pin 6b of the rear curtain 6, and urges the pressure portion 6a of the rear curtain 6 counterclockwise in FIG. 1 via the pin 6b.

By changing the respective engagement positions of the rotation prevention members 12 and 13 and the spring hooks 8 and 9, the forces of the springs 10 and 11 acting on the front curtain 5 and the rear curtain 6 can be changed. This change allows the operating speeds of the leading curtain 5 and trailing curtain 6 to be changed.

Reference numerals 14 and 16 are lever-shaped stoppers for limiting the rotation range of the leading curtain 5 and the trailing curtain 6, respectively. One end of the stoppers 14 and 16 is disposed at the end of rotation of the pressure section 5a of the front curtain 5 and the pressure section 6a of the rear curtain 6, and is located at the end that collides with the pressure sections 5a and 6a. Soft cushioning bodies 14a and 16a made of rubber or the like are fitted. The stoppers 14 and 16 are pivotally connected to the main plate 3 by screws 41 and 42 at positions away from the collision areas with the front curtain 5 and the rear curtain 6, respectively, and are rotatable about the screws 41 and 42, respectively. be. Further, a groove-shaped notch @ 14 is provided at the other end of each of the stoppers 14 and 16.
b and 16b are formed and the bottle 43 is protruded from the main plate 3.
and 44 are inserted into the notches 14b and 16b in a relatively loosely fitted state (so as to allow the stoppers 14 and 16 a degree of rotational play around the screws 41 and 42).

The stoppers 14 and 16 are made of a spring material that can be elastically deformed, and the pressure portion 5a of the front curtain 5 is pressed against the stopper 14.
Buffer body 14a 1. : When there is a collision (or when the pressure part 6a of the rear curtain 6 collides with the buffer body 16a of the stopper 16)
In this case, the pressure portion can be elastically deformed instantaneously to a large extent in the direction of movement.

Therefore, when the pressure portion 5a of the leading curtain 5 collides with the buffer 14a on the stopper 14 at high speed (or the pressure portion 6a of the trailing curtain 6
collides with the buffer body 16a on the stopper 16 at high speed), the elastic deformation of the stoppers 14 and 16, the slight rotation about the respective pivot points of the stoppers 14 and 16, and the buffer Since the kinetic energy of the leading curtain 5 and the trailing curtain 6 is absorbed by the elastic deformation of the bodies 14a and 16a, in the shutter device of the present invention, the shutter base (
There is no risk of the front curtain 5 and rear curtain 6) bouncing, and since the shutter base is integrally molded and lightweight,
The kinetic energy can be completely absorbed to ensure that the vehicle stops at a fixed position, and no collision noise is generated.

The respective pressure portions 5a and 6a of the leading curtain 5 and trailing curtain 6 are
A first locking member 23 that is rotatable about a shaft 24 as an initial position locking member for locking at the initial position shown in the figure.
, and a second locking member 33 that can rotate around the glaze 34.
, are arranged at positions outside the rotation locus of the pressure parts 5a and 6a. The tips of the first and second locking members 23 and 33 are configured to engage with a portion of the pressure portion 5a of the front curtain 5 and a portion of the pressure portion 6a of the rear curtain 6, as shown in FIG. At the rear ends of the members 23 and 33, there is a boss-shaped spring hook part 23a.
and 33a are formed. and axes 24 and 34
One end of the torsion springs 25 and 35 fitted in the spring hook engages with the portions 23a and 33a,
5, the first locking member 23 and second locking member 33 are urged clockwise in FIG. 1 about the shafts 24 and 34, respectively, and the tips of the members 23 and 33 It engages with the pressure section 5a of the leading curtain 5 and the pressure section 6a of the rear curtain 6 to prevent counterclockwise rotation of the pressure sections 5a and 6a.

! i[1I24''El and 34 are rotatably provided with lock release members 22 and 32 for releasing the locking of the pressure parts 5a and 6a by the first locking member 23 and the second locking member 33. Armatures 22a and 32a are fixed to one ends of the members 22 and 32, while the member 2
The spring hook of the first locking member 23 is attached to the other end of the first locking member 23.
3a and the spring hook of the second locking member 33 are formed with engaging portions 22b and 32b that engage with the portion 33a. The member 2
2 and 32 are return springs 2 loosely fitted to the shafts 24 and 34.
6 and 36) in the clockwise direction in FIG. 1, and in the initial position state of the front curtain 5 and rear curtain 6 shown in FIG. It is stopped in a state where it is in contact.

Reference numerals 20 and 30 indicate electromagnetic magnets serving as lock release means for releasing the locking of the front curtain 5 and the rear curtain 6 by the locking members 23 and 33;
is equipped with cores 21 and 31 for attracting the armatures 22a and 32a, and the cores 21 and 31
When energized, the armatures 22a and 32a are attracted to operate the unlocking members 22 and 32.

Reference numeral 37 denotes a swinging member rotatably fitted to the fixed shaft 39. As shown in FIG. 2, the member 37 is rotated by a pin 6b protruding from the pressure portion 6a of the rear curtain 6, and a torsion spring 38 loosely fitted into the cylindrical portion of the member 37. The tip of the member 37 is pressed against the pin 6b by being biased counterclockwise in FIG. 1 about the shaft 39. 37a is a bottle protruding from the rear end of the member 37, and the pin 37a is a spring hook that engages with 38, and also engages with a switch (not shown) or the like to transmit the completion of the exposure operation to the control device. It is part of the signal transmission means for this purpose.

Next, the operation of the apparatus of the present invention having the above structure will be explained.

Before the shutter mechanism operates, the lock release members 22 and 32 are biased clockwise about the shafts 24 and 34 by the force of the springs 26 and 36, as shown in FIG. 22a and 32a are in contact with the initial position stoppers 18 and 19. On the other hand, the first locking member 23 and the second locking member 33 are also biased clockwise around the shafts 24 and 34 by the forces of the springs 25 and 35, respectively, so that the tips of the members 23 and 33 are pushed toward the front curtain. 5
The front curtain 5 and the rear curtain 6 are respectively engaged with the pressure portion 5a of the front curtain 5 and the pressure portion 6a of the rear curtain 6, so that the front curtain 5 and the rear curtain 6 are prevented from rotating counterclockwise about the shaft 7.

At the time of photographing, the electromagnetic magnet 20 is first energized in response to a shutter release signal from a control circuit within the camera body (not shown), and the electromagnetic magnet 20 is magnetized by rB3. When the electromagnet 20 is excited, the armature 22a of the unlocking member 22 is attracted to its core 21, so that the member 22 overcomes the force of the spring 26 and rotates counterclockwise around the shaft 24. Ru. Therefore, the engaging portion 22b at the rear end of the member 22 pushes the spring hook portion 23a at the rear end of the first locking member 23, causing the locking member 23 to move to Il! Since the member 23 is rotated counterclockwise about the III 24, the engagement between the tip of the member 23 and the pressure portion 5a of the front curtain 5 is disengaged. As a result, the leading curtain 5 is rapidly rotated counterclockwise in FIG. So that the buffer 1 of the stopper 14
The rotation of the front curtain 5 stops when it collides with the blade 4a. At this time, as described above, the bottle 5b collides with the soft buffer body 14a, so it does not bounce back, and the kinetic energy of the front curtain 5 is converted into the deformation energy of the stopper 14 and the buffer body 14a, and the kinetic energy of the slight rotation of the stopper 14. Since it is completely absorbed, the front curtain 5 immediately stops without any vibration. As described above, when exposure is started when the trailing edge 5C of the front curtain 5 (FIG. 4) crosses in front of the light-receiving surface 1a of the solid-state image sensor 1, the electromagnetic magnet 30 is subsequently energized. When the electromagnet 30 is excited, the armature 32a at the tip of the unlocking member 32 is attracted to the core 31, and the member 32 is moved from the state shown in FIG.
It is rotated counterclockwise around 4. Therefore, the engaging part 32b at the rear end of the member 32 pushes the spring hook part 33a at the rear end of the second locking member 33, and the member 33 is rotated counterclockwise about the shaft 34, and the member 33 is rotated counterclockwise about the shaft 34. As a result, the member 33
Since the leading end of the rear curtain 6 is disengaged from the pressure portion 6a of the rear curtain 6, the rear curtain 6 is rapidly rotated counterclockwise about the shaft 7 from the position shown in FIG. 4 by the force of the spring 11. The exposure ends when the front edge 6d of the rear curtain 6 moves across the front of the light-receiving surface 1a of the solid-state image sensor 1, and the rear curtain 6 comes to cover the light-receiving surface 1a as shown in FIG. When the light receiving surface 1
Exposure of the entire area a is completed. When the rear curtain 6 begins to rotate, the pressure part 6a of the rear curtain 6 also rotates counterclockwise around the shaft 7, and when the front edge 6d of the rear curtain 6 passes over the entire surface of the light receiving surface 1a, the pressure part 6a rotates counterclockwise around the shaft 7. As shown in FIG.
7, the member 37 is rotated clockwise about the shaft 39, and therefore the pin 3 at the rear end of the member 37 is rotated clockwise about the shaft 39.
7a is rotated clockwise around the shaft 39. Therefore, a switch (not shown) that engages with the pin 37a is operated, and at the same time the bottle 6b is moved from the buffer body 18 of the stopper 16.
a, and the rotation of the rear curtain 6 is stopped (see FIG. 5).

When the end of exposure is detected by the switch or the like, the control circuit cuts off the electricity to the electromagnets 20 and 30, and then the bottle 5b is moved to the shaft 7 by a drive member (not shown).
It is rotated clockwise in FIG. 5 about . As a result, when the front curtain 5 is rotated clockwise around the shaft 7,
A pin 6c protruding from the pressure portion 6a of the rear curtain 6 (FIG. 2)
The rear curtain 6 is also rotated clockwise about the shaft 7 via the shaft 7. In this way, while the front curtain 5 and the rear curtain 6 are rotated clockwise from the position shown in FIG. 5 to the initial position shown in FIG. The first position is rotated clockwise about shafts 24 and 34 from the position shown in FIG. 5 by the forces of springs 26 and 36, respectively.
The first and second locking members 2 are returned to the initial position shown in the figure.
Since the spring hooks 23a and 33a of the respective members 22 and 33 are pushed by the spring hooks 23a and 33a, the locking members 23 and 33 are moved from the position shown in FIG. It is rotated clockwise and returns to the initial position shown in FIG. As a result, when the leading curtain 5 and the trailing curtain 6 return to the initial positions shown in FIG.
are again locked by the locking members 23 and 33, respectively, and the state shown in FIG. 1 is maintained.

[Effects of the Invention] As explained in the above embodiments, in the shutter device of the present invention, the stopper for regulating the operating range of the shutter curtain moves along the movement direction of the shutter curtain around its own pivot point. It is pivoted to the base plate etc. so that it can rotate slightly, and is made of a material that can be elastically deformed when it collides with the shutter curtain, and the part of the stopper that collides with the shutter curtain is covered with rubber, etc. Since a shock absorber made of a stretchable and flexible material is attached, the shutter base can be reliably stopped at a fixed position without bouncing even without an additional mechanism such as a brake mechanism, and the shutter unit can be Does not generate large vibrations or noise. Further, in the shutter device of the present invention, since the shutter base is integrally molded to be lightweight, its kinetic energy is small, and therefore, it can be reliably stopped at a fixed position without bouncing even without a brake mechanism.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the internal mechanism of the shutter device of the present invention with the cover removed before the exposure operation starts, and FIG. 2 is a front view of the shutter device 11-11 in FIG. 3 is a cross-sectional view taken along arrows III-I11 in FIG. 1, FIG. 4 is a front view of the shutter device with the cover removed and the state after the start of exposure operation, and FIG. 5 is exposure FIG. 3 is a front view showing the state at the end of the operation. 1... Solid-state image sensor, 1a... Light receiving surface, 2...
...filter, 3...base plate, 4...cover, 5...front curtain, 6...rear curtain,
7... Shaft, 8 and 9... Spring hook, 10 and 11... Spring, 12 and 13... Rotating member, 14 and 16... Stopper, 17... Leaf spring, 18 and 19...Initial position striker, 20 and 3
0... Electromagnetic magnet, 22 and 32... Lock release member, 22a and 32a... Armature. Figure 2 Figure 4

Claims (1)

[Claims] A shutter device having a shutter curtain that moves to open and close, and a stopper that restricts the operating range of the shutter curtain, wherein the stopper is elastic in the direction of movement of the shutter curtain when it collides with the shutter curtain. It is made of a deformable material and is pivoted to a fixed body so that it can rotate slightly around the pivot point, and the part of the stopper that collides with the shutter curtain is made of elastic material such as rubber. What is claimed is: 1. A shutter device characterized in that a flexible cushioning member is attached thereto, and the shutter curtain is integrally molded to be lightweight.