JP2002258350A - Shutter device of camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a shutter from being misopened without increasing the number of components. SOLUTION: A shutter blade 32 is composed of a blade part 42, a fitting hole 43, a projection 45 for preventing a projection for open from being misopened, and a pin 47. A shutter driving lever 55 has a kick lever 55a. When the shutter driving lever 55 rotates from its charge position to this release completion position, the kick lever 55a kicks a projection 44 for open away. When the shutter blade 32 is rotated by the kick lever 55a, the blade part 42 moves from the closure position where an exposure opening 41 is closed to the opening position where the exposure opening 41 is exposed. The shutter blade 32 which moves to the opening position is returned to the closure position by a spring 46 provided to the pin 47. At the charge position, the kick lever 55a is positioned between the projection 44 for open and the projection 45 for misopen prevention. Even if the shutter lever 32 rotates on receiving a shock, the projection 45 for misopen prevention is received by the kick lever 55a, so it never moves to the opening position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter device for a camera, and more particularly to a shutter device for a kick-type camera.

[0002]

2. Description of the Related Art Inexpensive cameras such as a lens-fitted film unit use a kicking type shutter device. In the kicking-type shutter device, in response to a release operation, a shutter driving lever is rotated from a charge position to a release completion position by a biasing force of a spring. Exposure is performed.

[0003] In the above-described kicking-type shutter device, even when the user performs an intentional release operation, for example, when receiving a shock due to a drop or a sudden vibration. In some cases, the shutter blade may move to the open position. If the shutter blades are opened in such a state and exposure is performed on the photographic film, the subsequent exposure will result in double exposure, and the image will be significantly reduced.

Therefore, there is a demand for a shutter device having a structure capable of preventing the shutter blades from being erroneously opened at the time other than the release operation intended by the user under the influence of shock or vibration. In the camera described in Japanese Patent Application Laid-Open No. 2000-310805, when the shutter blade is at the closed position, a blocking member is provided to abut on the shutter blade to prevent the shutter blade from moving to the open position. With this camera,
The rotation hole of the shutter blade is formed in a long hole shape connecting two circles. When the shutter blade is kicked off by the kicking lever, the shutter blade moves along the long hole and moves on the rotation orbit of the shutter blade. The shutter member can be opened without interfering with the blocking member because the blocking member is retracted from the shutter blade. However, when the kicking operation is not performed, the blocking member is positioned on the rotation trajectory of the shutter blade, and the shutter blade is caused by an impact or the like. When the member attempts to rotate to the open position, it is received by the blocking member, so that erroneous opening can be prevented.

In a camera having an impact safety mechanism described in Japanese Utility Model Publication No. Sho 63-26810, a weight is provided inside the camera so that when the camera receives an impact,
The movement of the shutter drive lever is restricted by the inertia of the weight to prevent the shutter drive lever from moving in the direction to open the shutter blades.
In the camera malfunction prevention device described in JP-A-83, the camera is arranged so as to move between a blocking position for blocking the operation of the drive unit for driving the shutter blades and a retreat position retreating from the blocking position. A blocking member is provided to prevent the shutter blade from being erroneously opened by moving the blocking member to the blocking position when the camera receives an impact.

[0006]

However, in the camera described in Japanese Patent Application Laid-Open No. 2000-310805, when the shutter blade is kicked off, the camera is retracted from a blocking member for preventing erroneous opening. Since it requires a complicated mechanism to move along the rotating hole, movement such as moving along the rotating hole is improper due to the influence of variations such as the urging force of the spring and the frictional force acting on the shutter blades. It can be considered stable. If such an operation becomes unstable, the blocking member will not retreat from the rotation trajectory of the shutter blade, causing a problem that the shutter will not be opened accurately even when the kick operation of the shutter blade is performed. Further, in the camera described in Japanese Utility Model Publication No. Sho 63-26810, a weight that restricts the operation of the shutter drive lever is prevented, and in the camera described in Japanese Patent Publication No. 7-95183, the operation of the drive unit is prevented. Each of the blocking members is moved by utilizing inertia when the camera receives an impact. As described above, in the case where a complicated mechanism, such as utilizing the inertia at the time of receiving an impact, is provided, the operation is often unstable, and further cost is required to increase the accuracy of the operation.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is possible to prevent the shutter blades from being erroneously opened when subjected to shock or vibration without increasing the number of components and without complicating the mechanism. It is an object of the present invention to provide a shutter device for a camera which can be used.

[0008]

In order to achieve the above object, a camera shutter device of the present invention is movably mounted between an open position for opening an exposure opening and a closed position for closing the exposure opening. A shutter blade biased to a closed position by the bias of a return spring, and a shutter driven by a biased shutter drive spring when the lock at a charging position is released in conjunction with a shutter release. A shutter drive lever that kicks the blade to the open position against the bias of the return spring; and when the shutter blade moves from the closed position to the open position, the shutter drive lever moves to the charge position. An erroneous opening prevention projection that is received and prevents the shutter blade from moving in the opening position direction is integrally provided. The shutter blade covers the exposure opening when it is in the closed position, an opening projection for opening the exposure opening by moving the blade by being kicked by the shutter drive lever, and a shutter for preventing erroneous opening. It is preferable that the projection for preventing erroneous opening is located at a position opposite to the projection for opening with respect to the shutter driving lever at the charging position. Further, the shutter drive lever has a mating surface formed on the side facing the erroneous opening prevention projection so as to match the erroneous opening prevention projection. It is preferable that the surface receives the projection for preventing erroneous opening.

[0009]

FIG. 1 shows the appearance of a camera 1 incorporating a shutter device of the present invention at the time of photographing. On the front surface of the camera body 2, a photographing lens 3, an object-side finder window 4, a strobe light emitting section 5, and an operation knob 6 are provided. On the upper surface, a shutter button 8, a counter window 9 for displaying the remaining number of recordable images, a charging display A light guide 10 constituting a member, an opening 11 used for projecting the display light guide 10 and the like are provided. On the back side of the camera body 2, an eyepiece side finder window (not shown) and the like are provided.

As shown in an exploded perspective view of FIG. 2, the camera body 2 includes an exposure unit 15 and a finder unit 1.
6, a main body 17 incorporating various photographing mechanisms such as a strobe light emitting section 5, a shutter mechanism, and a film feeding mechanism; and a front cover 18 and a rear cover 19 attached to the main body 17 from front and rear. Front cover 18 and rear cover 1
9 and most of the components constituting the main body 17 are made of plastic to reduce the weight and cost. The front cover 18 and the rear cover 19 are fixed to the main body 17 by screws, and the front cover 18 and the rear cover 19 are connected to each other by screws.

On the front surface of the front cover 18, the taking lens 3,
An opening for exposing the objective-side finder window 4, the strobe light-emitting unit 5, and the like is formed.
An opening (not shown) for exposing a finder eyepiece, various switches, and the like is formed. The opening for exposing the shutter button 8, the counter window 9, and the light guide 10 is formed so as to straddle the joint surface when the front cover 18 and the rear cover 19 are connected. The battery compartment lid 22 for loading and the loading lid 24 for taking out the film cartridge 23 are attached so as to be sandwiched between the joining surfaces of the front cover 18 and the rear cover 19.

The operation knob 6 is attached to the front cover 18 so as to be slidable in the horizontal direction in the drawing, and one end thereof is connected to a lens cover (not shown) attached to the inside of the front cover 18. When performing, when the slide operation is performed to the left photographing position viewed from the front, the photographing lens 3 is exposed, and when photographing is completed, the photographing lens 3 is shielded by the slide operation to the right shielding position. . When the operation knob 6 is slid to the shooting position, the light guide 10 projects from an opening 11 formed on the upper surface side of the camera body 2 in conjunction with the sliding operation.
Flash charging starts. When the strobe charging is completed, the display light guide 10 emits light to notify the photographer and the subject of the completion of the strobe charging. When the operation knob 6 is slid to the shielding position, the display light guide 10 is stored in the camera body 2.

The main body 17 has an exposure unit 15 at the center.
The cartridge chamber 25 in which the film cartridge 23 is loaded is provided on one side, and the other side is provided with the exposure unit 15 therebetween.
A film take-up chamber 26 for taking up a photographic film drawn from the film cartridge 23 is provided. A drive shaft that is engaged with the spool of the film cartridge 23 and rotates is provided above the cartridge chamber 25,
A light-shielding lid opening / closing mechanism for rotating a light-shielding lid for opening and closing the film entrance of the film cartridge 23 is incorporated. A plurality of electric components are mounted in front of the cartridge chamber 25, and a circuit board 27 on which a strobe circuit or the like is formed is mounted.

A take-up shaft (not shown) for taking up the photographic film drawn out of the film cartridge 23 and a motor for rotating the take-up shaft are built in the film take-up chamber 26. I have. In addition, a strobe light emitting section 5 and a light guide 10 are mounted above the film winding chamber 26, and a battery chamber 28 for accommodating the power supply battery 21 is provided on a side portion. In the strobe light emitting unit 5, a discharge tube, a reflector and the like are incorporated in the back of a diffusion plate 5a also serving as a protector. The strobe light emitting unit 5 is connected to the circuit board 27 by a not-shown electric wire cord to constitute a strobe device.

The shutter device 30 of the present invention is incorporated in the exposure unit 15 and, as shown in FIG. 3, comprises a shutter driving mechanism 31, shutter blades 32, and a dark box 33 in which these are incorporated. At the rear end of the dark box 33,
An aperture for determining the exposure range of the photographic film 34 drawn from the film cartridge 23 is integrally formed. The exposure unit 15 includes the shutter driving mechanism 3
1. In addition to the shutter blade 32, a lens barrel 35, a film regulating plate (not shown), and the like are assembled into a dark box 33 to form a unit. The film regulation plate is a dark box 33
And supports the photo film 34 from the back. A film passage through which the photographic film 34 passes is formed by the space between the film regulating plate and the above-mentioned aperture.

On the front surface of the dark box 33, shutter blades 32,
The lens barrel 35 is attached in this order. The lens barrel 35 includes a cover plate 36 that covers the front side of the dark box 33.
And a lens holder 37 integrally formed in front of the cover plate portion 36 and holding the photographing lens 3. In addition, a red-eye prevention lamp 38 is attached above the lens holder 37.

The shutter blade 32 is composed of one sector blade, and is rotatably attached to a rotation shaft 40 provided at an upper portion of the front surface of the dark box 33. The shutter blade 32 includes a blade portion 42 that covers an exposure opening 41 provided on the front surface of the dark box 33, a fitting hole 43 that is disposed above the blade portion 42, and that fits with the rotating shaft 40. Mating hole 4
3 and a shutter opening projection 44 protruding in a direction perpendicular to the axial direction of the fitting hole 43, and a shutter opening projection 44 disposed near the shutter opening projection 44. It comprises a projection 45 for preventing erroneous opening of the shutter, which protrudes in a direction perpendicular to the axial direction, and a pin 47 for hooking one end of a return spring 46. The other end of the return spring 46 is hung on the dark box 33.
The shutter blade 32 is urged toward a closed position where the exposure opening 41 is blocked by the blade portion 42. The cover plate 36 of the lens barrel 35 is put on the front surface of the shutter blade 32. When the shutter blade 32 is in the closed position, the projection 44 for opening the shutter and the projection 45 for preventing erroneous opening of the shutter protrude from the notch 36 a formed on the upper surface of the cover plate 36.

Four bosses 50, 51, 52, 53 are integrally formed on the upper surface of the dark box 33 in which the shutter drive mechanism 31 is incorporated, and these bosses 50, 51, 52, 53 are arranged close to each other. I have. A plastic shutter drive lever 55 is rotatably attached to the boss 50. A cam member 56 is rotatably attached to the boss 51. A transmission gear 57 is inserted through the boss 52 and is connected to a sprocket 58 inserted from behind the dark box 51. A metal shutter driving spring 59 is fitted on the boss 53, and furthermore, a plastic locking lever 6 is provided.
0 is rotatably mounted.

The shutter drive lever 55 is described in detail in FIG.
As shown in FIG. At the front end of the shutter drive lever 55, there is a kicking lever 55a for kicking off the shutter opening projection 44 of the shutter blade 32 at the time of a release operation. A locked projection 55b to be stopped is provided. At a side end of the shutter drive lever 55, a cam follower 55c that is in sliding contact with the cam member 56 is provided. A spring receiving portion 55d is provided at the rear end of the shutter driving lever 55, and a shutter driving spring 59 is provided.
End 59a is slidably attached to receive an urging force from a shutter driving spring 59. When the shutter drive lever 55 is in the charging position, the kicking lever 55
“a” is disposed so as to be sandwiched between the shutter opening projection 44 and the shutter erroneous opening prevention projection 45. Further, as shown in an enlarged view of FIG. 5, the lower surface of the kick lever 55a has an inclined surface 55e on the side facing the shutter erroneous opening prevention projection 45. This inclined surface 55
The angle e is adjusted so that when the shutter blade 32 rotates from the closed position to the open position, the shutter blade 32 comes into contact with the shutter erroneous opening prevention protrusion 45.

The cam member 56 is provided with a disc 61, a cam 62 below the disc 61, and a gear 63 below the cam 62. A notch 61 a for locking the locking piece 60 a of the locking lever 60 is formed in the disk 61. The cam follower 55c of the shutter drive lever 55 contacts the outer periphery of the cam 62. The cam member 56 is rotatably attached to the boss 51, and the gear 63 meshes with the transmission gear 57. When the photographic film 34 is fed by one frame, the photographic film 34 is wound on a winding shaft inside the film winding chamber 26 by rotation of the motor. This one
At the time of frame advance, since the sprocket 58 is engaged with the perforation 34a formed on the photographic film 34, it rotates clockwise in the drawing. Thus, the transmission gear 57 and the cam member 56 are also driven to rotate.

One end 59a of the shutter driving spring 59 is
As described above, the other end 59b is attached to the spring receiving portion 55d of the shutter drive lever 55,
Is hooked on the hook 60c of the locking lever 60. As a result, the shutter drive lever 55 is urged counterclockwise and the locking lever 60 is urged clockwise. A circular coil portion 59c is provided between both ends thereof.
c is rotatably attached to the boss 53.

The switch lever 60d is located at a position where it does not interfere with the locking piece 60a and the hook 60c.
When the shutter is released, the tip of the switch lever 60 d presses the microswitch 64. The micro switch 64 is a red-eye prevention lamp 3
When the micro switch 64 is pressed by the switch lever 60d, the red-eye prevention lamp 38 is energized and emits light in synchronization with the shutter release.
The end portion 8a of the shutter button 8 is in contact with the hook 60c of the locking lever 60, and when the shutter button 8 is pressed, the locking lever 60 that has received the pressing force through the end portion 8a counterclockwise. Is rotated in the direction
The lock between the b and the locked projection 55b is released.

The operation of the above configuration will be described below. Immediately after the shutter release, the shutter drive mechanism 31
Is in a state as shown in FIG. When the photographic film 34 is wound by one frame by the rotation of the film winding mechanism, the cam member 56 rotates counterclockwise in the drawing. The rotation of the cam member 56 causes the cam 6 to rotate.
2 slidably contacts the cam follower 55c and presses the shutter drive lever 55. As a result, the shutter drive lever 55 rotates clockwise in the figure against the bias of the shutter drive spring 59. When the cam member 56 further rotates, the disk 61
The locking piece 60a is locked in the notch 61a of FIG.
A charge state as shown in FIG. At this time, since the cam 62 has passed the position of the cam follower 55c, the shutter drive lever 55 tries to rotate counterclockwise in FIG. Is the locking projection 60 of the locking lever 60
b, the shutter drive lever 55 cannot rotate.

When the shutter drive lever 55 is at the charge position as shown in FIG. 4B, the kicking lever 55a is moved by the shutter release projection 44 and the shutter malfunction prevention projection 45 of the shutter blade 32 as described above. It is located to be sandwiched between. On the other hand, the shutter blade 32
Is before being kicked off by the shutter drive lever 55.
As shown in FIG. 5A, the exposure opening 41 is in a closed position where the blade 42 blocks the exposure opening 41. In such a charged state, the user may accidentally drop the camera 2 and give an impact. Due to the impact of the drop, the shutter blade 32 attempts to rotate clockwise in the figure against the bias of the return spring 46, but the shutter drive lever 55 5B, the projection 45 for preventing erroneous opening of the shutter is provided by the kicking lever 5a as shown in FIG.
5a, the rotation of the shutter blade 32 stops. This prevents the shutter blades 32 from moving from the closed position to the open position even when an impact is received. Further, as described above, since the inclined surface 55e of the shutter drive lever 55 is formed at an angle corresponding to the erroneous shutter opening prevention projection 45, the area for receiving the erroneous shutter opening prevention projection 45 is large, so that it is ensured. I can take it.

When the hook 60c of the locking lever 60 is pressed by the distal end 8a provided integrally with the shutter button 8 in response to the release operation, FIG.
As shown in FIG. 7, the locking lever 60 is pressed counterclockwise in the figure, and rotates counterclockwise in the figure against the bias of the shutter driving spring 59. Accordingly, the locking of the locked projection 55b by the locking projection 60b is released, and the shutter drive lever 55 starts rotating from the charge position toward the release completed position by the bias of the shutter drive spring 59. . When the shutter drive lever 55 rotates,
Shock release projection 44 by kicking lever 55a
Is kicked off, and the exposure to the photographic film 34 is performed to complete one exposure operation. When photographing is performed in this way, as described above, even if an impact is received at the charge position, the shutter blades 32 can be prevented from being erroneously opened, so that double exposure does not occur, and clear images are obtained. Image can be obtained. Immediately after the shutter release (in the state shown in FIG. 4A), the shutter drive lever 55 is separated from the erroneous shutter opening prevention projection 45. However, in the camera 1 of the present embodiment, the photographic film 3 can be opened immediately after the shutter release.
4 is performed and the shutter drive lever 55 rotates to the charge position (the state shown in FIG. 4B).
There is little possibility that the shutter blade 32 will be erroneously opened due to an impact during the short time.

In the above-described embodiment, an example in which the present invention is applied to an inexpensive compact camera has been described. However, the present invention is not limited to this. The invention may be implemented in a unit. The movement between the closed position and the open position of the shutter blade is not limited to switching the position by rotating the shutter blade as in the above-described example, but may be slidably attached to switch the position.
In addition, the position of the shutter erroneous opening prevention protrusion is not limited to the above-described position, but may be any position as long as the shutter drive lever is arranged on the rotation track and the shutter blade is received.

[0027]

As described above, according to the camera shutter device of the present invention, the shutter is movably mounted between the open position for opening the exposure opening and the closed position for closing the exposure opening, and is provided with a return spring. A shutter blade that is biased to a closed position by a force and a shutter blade that is returned by a biased shutter drive spring when the lock at a charge position is released in conjunction with a shutter release. A shutter drive lever that kicks to the open position against the urging of the shutter blade. When the shutter blade attempts to move from the closed position to the open position, it is received by the shutter drive lever at the charge position, Since the erroneous opening prevention protrusion that prevents erroneous opening is provided integrally, even if the camera in the charged state receives an impact, erroneous opening of the shutter blades is prevented. Door can be. Further, since there is no need to separately provide a member for preventing the shutter from being erroneously opened, the cost of the camera can be reduced.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a camera incorporating a shutter device of the present invention.

FIG. 2 is an exploded perspective view of the camera shown in FIG.

FIG. 3 is an exploded perspective view showing a configuration of a shutter device of the present invention.

FIG. 4 is an explanatory diagram illustrating a state of a shutter driving mechanism at a charge position and a release completion position immediately after the release.

FIG. 5A is a schematic diagram illustrating a main part of the shutter device when an impact is applied in a shutter charging completed state and in a shutter charging completed state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera 30 Shutter device 31 Shutter drive mechanism 32 Shutter blade 33 Dark box 34 Photo film 40 Rotating shaft 41 Exposure opening 42 Blade part 43 Fitting hole 44 Shutter release projection 45 Shutter incorrect opening prevention projection 46 Return spring 55 Shutter drive lever 55a Kicking lever 55e Inclined surface 59 Shutter drive spring

Claims (3)

[Claims] 1. An image forming apparatus, comprising: an open position for opening an exposure opening; and a closed position for closing the exposure opening.
A shutter blade urged to a closed position by a return spring, and the shutter blade urged by a stored shutter drive spring when unlocked at a charging position in conjunction with a shutter release. And a shutter drive lever for kicking the shutter blade to the open position against the bias of the return spring. The shutter blade has a charge position when the shutter blade is moved from the closed position to the open position. A shutter device for a camera, wherein a projection for preventing erroneous opening, which is received by the shutter driving lever and prevents the shutter blade from moving in the open position direction, is provided integrally. 2. The shutter blade, wherein the shutter blade covers an exposure opening when in a closed position, and an opening protrusion for opening the exposure opening by moving the blade by being kicked off by the shutter drive lever. And the erroneous opening prevention protrusion, at a position opposite to the opening protrusion with respect to the shutter drive lever at the charging position,
2. The camera shutter device according to claim 1, wherein the erroneous opening prevention projection is located. 3. The shutter drive lever has a mating surface formed on the side facing the erroneous opening prevention projection so as to match the erroneous opening prevention projection, and the shutter blade moves from a closed position to an open position. 3. The camera shutter device according to claim 1, wherein said mating surface receives said erroneous opening prevention projection when trying to do so.