JP2008096769A - Shutter device for camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shutter device for a camera capable of appropriately restraining bound by softening a shock when two shutter blades abut on a stopper in finishing opening/shutting operation by contriving the constitution of the two shutter blades, and suitable for miniaturization and reduction of cost. <P>SOLUTION: The two shutter blades 3 and 4 rotated in opposite directions simultaneously by a drive pin 5c have overhanging parts 3c and 4c and light shielding parts 3d and 4d between base ends 3a and 4a and leading ends 3b and 4b, and rotatably attached to blade shafts 1c and 1d at the base ends 3a and 4a. The two shutter blades 3 and 4 are constituted so that superposing relation between the base ends 3a and 4a is reverse to superposing relation between the overhanging parts 3c and 4c, and superposing relation between the leading ends 3b and 4b and the light shielding parts 3d and 4d is the same as the superposing relation between the overhanging parts 3c and 4c. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a camera shutter device including two shutter blades that are opened and closed by simultaneously rotating in opposite directions.

  Patent Document 1 below describes a camera shutter device in which two shutter blades are simultaneously rotated in opposite directions by a driving pin of a driving unit to open and close an opening for a photographing optical path. ing. In this type of shutter device, two shutter blades are individually attached to the base plate at their base end portions, and are inserted into the long holes formed at their base end portions. Since the above-described drive pins are configured to be fitted, the base end portions of the two always overlap each other and come into sliding contact during the opening / closing operation. In the case of this type of shutter device, the opening and closing operations of the two shutter blades are stopped when at least one of the shutter blades comes into contact with the stopper. Yes.

JP 2003-177447 A

  By the way, it is known that the shutter blade greatly bounces when it comes into contact with the stopper at the end of the opening operation or the closing operation. And if it bounces at the end of the opening operation, part of the opening for the photographing optical path may be temporarily closed, and if it bounces at the end of the closing operation, part of the opening for the photographing optical path is temporarily Sometimes open. Therefore, in order to prevent such a situation from occurring, the shutter blades may be configured to contact the stopper after operating to the position where the bound amount is expected. Then, it becomes necessary to enlarge the base plate or enlarge the shutter blades. Therefore, various methods for reducing the bound amount itself have been proposed and implemented without using such a configuration. In the case of the shutter device described in Patent Document 1, only one of the two shutter blades is brought into contact with the stopper, and the bounce amount is suppressed to be small by using a driving focus connecting configuration. I can do it.

  However, recently, the miniaturization of cameras has progressed, and the demand for miniaturization of the shutter device has become more severe. Therefore, in order to meet such demands, it is necessary to reduce the planar shape of the main plate by making the shutter blades as small as possible. Thus, the configuration described in Patent Document 1 is no longer sufficient. On the other hand, the demand for cost reduction of the shutter device has become stricter. Therefore, such a bounce suppression measure should not lead to an increase in cost. Accordingly, there is a demand for the appearance of a shutter device suitable for downsizing that can suitably suppress bounding without increasing the number of parts, complicating the shape of components, or increasing the number of processing steps.

  The present invention has been made to solve such a problem, and the object of the present invention is to increase the number of parts and to make the shape of the constituent members two shutter blades. With this configuration alone, it is an object to provide a camera shutter device suitable for miniaturization, which can alleviate the impact when abutting against a stopper at the end of each opening / closing operation, and can suitably suppress the bounce.

  In order to achieve the above object, a camera shutter device according to the present invention includes a base plate having an opening for a photographing optical path, and a long hole in a base end portion, and a part of the base end portion. And a first shutter blade that is rotatably attached to the base plate and has a light-shielding portion for opening and closing the opening on the distal end side, and a base end portion of the first shutter blade. The overlapping base end has a long hole, and a part of the base end is rotatably attached to the main plate. The base end is provided on the front end side to open and close the opening. A second shutter blade assembled so as to overlap the light shielding portion of the first shutter blade such that a light shielding portion is opposite to the overlap between the base end portions; and the length of the two shutter blades Has a drive pin fitted in both of the holes, and the drive pin is reciprocated. Rukoto by so that and a driving means for causing the opening and closing operation of the opening by rotating the two shutter blades to simultaneously opposite directions.

  In this case, the two shutter blades have an overhanging portion that overlaps with the base end portion and is in sliding contact with each other during the opening / closing operation, between the base end portion and the light shielding portion. Alternatively, the distal end portions may overlap each other opposite to the proximal end portions, and may be in sliding contact during the opening / closing operation.

  The camera shutter device of the present invention does not simply overlap two shutter blades that open and close the opening for the photographing optical path by simultaneously rotating in opposite directions. By simply assembling so that the overlap between the base end parts and the overlap between the light shielding parts are reversed, the impact when contacting the stopper can be mitigated and the bounce can be suppressed. The apparatus can be downsized.

  The embodiment of the present invention will be described with reference to two illustrated examples. The camera shutter device of the present invention can be used for a single digital camera, a digital camera built in various information terminal devices, or a camera using a silver salt film. It is. However, the description of the operation of each embodiment will be described in the case where it is adopted in a digital camera.

  This embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a plan view showing a blade chamber in a fully open state of the shutter (photographing standby state), and FIG. 2 shows the overall configuration of the apparatus. FIG. 3 is a cross-sectional view showing easily, and FIG. 3 is a plan view showing the blade chamber in a closed state of the shutter. First, the configuration of this embodiment will be described. The base plate 1 of the present embodiment is made of a synthetic resin and is a relatively thick member as can be seen from FIG. Further, the planar shape is an irregular hexagon as shown in FIG. 1, and an opening 1a for a photographing optical path having a circular shape is formed at a substantially central portion thereof. Forms a long hole 1b having an arc shape. And this ground plate 1 is provided with blade shafts 1c, 1d, stopper shafts 1e, 1f, 1g, 1h, and mounting shafts 1i, 1j on the surface of the blade chamber formed between the cover plate 2 and the cover plate 2. As shown in FIG. 2, a rotor shaft 1k and mounting shafts 1m and 1n are erected on the surface outside the blade chamber on the opposite side.

  As can be seen from FIG. 2, the cover plate 2 is made of a thin synthetic resin. In FIG. 1, only the attachment portion to the base plate 1 is shown. And the attachment method is called so-called heat caulking, and it is a tip part inserted into the hole formed in the cover plate 2 by inserting the attachment shafts 1i, 1j having a cylindrical shape and protruding outside the blade chamber. It is attached by thermally melting and deforming it into a flange shape. The cover plate 2 has substantially the same planar shape as that of the base plate 1, and as shown in FIG. 2, an opening 2a for a photographing optical path having a slightly larger diameter is provided at a position facing the opening 1a. The long hole 2b having the same shape is formed at a position facing the long hole 1b. As shown in FIG. 2, the cover plate 2 has holes 2c and 2d for inserting the tip ends of the blade shafts 1c and 1d, as well as the stopper shafts 1e, 1f, A hole (not shown) for inserting the tips of 1g and 1h is also formed.

  The two shutter blades 3 and 4 arranged in the blade chamber are respectively provided with overhang portions 3c and 4c and light shielding portions 3d and 4d between the base end portions 3a and 4a and the tip end portions 3b and 4b. In addition, elongated holes 3e, 4e and holes 3f, 4f are formed in the base end portions 3a, 4a. And the attachment method with respect to the ground plane 1 is made to fit the hole 3f formed in the base end part 3a of the shutter blade | wing 3 rotatably with respect to said blade | wing shaft 1c first. Next, both the shutter blades 3 and 4 are slightly bent, and the tip portion 4b and the overhang portion 4c of the shutter blade 4 are slid to the base plate 1 side from the tip portion 3b and the overhang portion 3c of the shutter blade 3. After that, the base end portion 4a of the shutter blade 4 is overlapped on the base portion 3a of the shutter blade 3, and the hole 4f formed therein is rotatably fitted to the blade shaft 1d. As a result, the base end portion 3a and the base end portion 4a are overlapped with the base end portion 3a facing the base plate 1, but the tip end portion 3b, the overhang portion 3c, the light shielding portion 3d, and the tip end portion 4b are overlapped. In contrast, the overhanging portion 4c and the light shielding portion 4d are overlapped with the tip portion 4b, the overhanging portion 4c and the light shielding portion 4d facing the base plate 1 side.

  An electromagnetic actuator of the same type as a known electromagnetic actuator described in, for example, Japanese Patent Application Laid-Open No. 2005-287159 is attached to the surface outside the blade chamber of the base plate 1. First, the rotor 5 is made of a permanent magnet, is rotatably attached to the rotor shaft 1k, and is prevented from coming off by the stator frame 6. The rotor 5 includes a cylindrical body portion 5a, an arm portion 5b projecting in the radial direction thereof, and a drive pin 5c provided at the tip thereof. The rotor 5 has two poles in the radial direction of the body portion 5a. Magnetized. The drive pin 5 c is inserted from the long hole 1 b of the base plate 1, is fitted into the long holes 3 e and 4 e of the shutter blades 3 and 4 in the blade chamber, and the tip is inserted into the long hole 2 b of the cover plate 2. . In addition, in this kind of electromagnetic actuator, what made said arm part 5b and the drive pin 5c into the product made from a synthetic resin is also known.

  Next, the stator is composed of the stator frame 6, the coil 7, and the yoke 8. First, the stator frame 6 has a hollow bobbin portion 6a around which a coil 7 is wound, and is attached to the mounting shafts 1m and 1n of the base plate 1 by the above-described thermal caulking. Further, the yoke 8 is not clearly shown in its shape, but, like the yoke described in Japanese Patent Application Laid-Open No. 2005-287159, has a substantially U shape with a base and two legs. One leg portion is passed through the hollow portion of the bobbin portion 6a, and the tips of both leg portions are opposed to the peripheral surface of the main body portion 5a of the rotor 5 as magnetic pole portions.

  As is well known, the electromagnetic actuator having such a configuration is such that the rotor 5 rotates in a direction corresponding to the energization direction to the coil 7 only within a predetermined angle range. Further, when the coil 7 is not energized, the rotor 5 gives a rotational force to one of them due to the magnetic attractive force acting between the magnetic pole on the peripheral surface of the main body 5 a and the magnetic pole of the yoke 8. It is supposed to be. Although the electromagnetic actuator of the present embodiment has such a configuration, the driving means of the present invention is not limited to the electromagnetic actuator having such a configuration, and the electromagnetic actuator has various configurations including a step motor. It may be an actuator or a mechanical actuator using a spring force.

  Next, the operation of this embodiment will be described. First, FIG. 1 shows a state where the power switch of the camera is turned on but the coil 7 of the electromagnetic actuator is not energized. However, at this time, as is well known, a force to rotate the rotor 5 in the clockwise direction is given to the two magnetic pole portions of the yoke 8 and the two magnetic poles of the rotor 5 facing each other. For this reason, the driving pin 5c applies a force that rotates the shutter blade 3 in the clockwise direction and a force that rotates the shutter blade 4 in the counterclockwise direction, but the rotation is blocked by the stopper shafts 1e and 1f. Thus, the fully opened state of the opening 1a is maintained. Accordingly, at this time, since the subject light is applied to the solid-state image sensor, the photographer can observe the subject image with a display device such as a liquid crystal display.

  Upon shooting, when the release button of the camera is pressed, the charge accumulated in the solid-state image sensor (not shown) is immediately released to start photographing, and new charges are accumulated in the solid-state image sensor. When a predetermined time elapses, a forward current is supplied to the coil 7 by a signal from the exposure time control circuit, and the rotor 5 is rotated counterclockwise in FIG. Therefore, the shutter blade 3 is rotated counterclockwise by the drive pin 5c, and the shutter blade 4 is rotated clockwise to perform the closing operation of the opening 1a. At this time, in the case of this embodiment, the two shutter blades 3 and 4 are overlapped in the base end portions 3a and 4a and the other portions 3b to 3d and 4b to 4d. Therefore, compared with the conventional case where the same overlapping method is used, the frictional resistance acting at the time of sliding contact between the two works greatly.

  Thereafter, when the shutter blades 3 and 4 close the opening 1a, immediately after that, the tip portion 4b of the shutter blade 4 comes into contact with the stopper shaft 1h and bounces due to the impact. However, in the case of the present embodiment, the frictional resistance force generated between the shutter blades 3 and 4 acts as a braking force, so that the impact is compared with the conventional overlapping method. The force is small, the bounce force is weak, and the shutter blade 4 is not destroyed. Moreover, when the shutter blade 4 bounces and rotates counterclockwise in this way, the tip 3b of the shutter blade 3 is not yet in contact with the stopper shaft 1g.

  Therefore, since the counterclockwise rotation of the shutter blade 4 at the time of bouncing is performed against the rotational force of the rotor 5 and the shutter blade 3 that are still in motion, the amount of rotation (bound amount) is extremely large. Will be suppressed. FIG. 3 shows a state in which the shutter blades 3 and 4 are stationary without temporarily opening a part of the opening 1a by bounce. As is well known, the stopper shaft 1g is mainly for restricting a large movement of the shutter blade 3 so as to obtain a stationary state at an early stage, and is not necessarily required depending on the specification. .

  In this way, when the state shown in FIG. 3 is reached, the electric charge accumulated in the solid-state imaging device is transferred to the storage device as imaging information. Since the shutter blades 3 and 4 are still stationary without being temporarily re-exposed, the imaging information is transferred to the storage device without causing harmful smearing, and then the imaging standby state is quickly entered. Start the return operation. In this case, when a current in the reverse direction is supplied to the coil 7, the rotor 5 is rotated clockwise in FIG. Therefore, the shutter blade 3 is rotated clockwise by the drive pin 5c, and the shutter blade 4 is rotated counterclockwise to perform the opening operation of the opening 1a.

  Thereafter, the shutter blades 3 and 4 bounce in contact with the stopper shafts 1e and 1f immediately after the opening 1a is fully opened. However, in the case of the present embodiment, since the frictional resistance force generated between the shutter blades 3 and 4 acts as a braking force in the opening operation of the shutter blades 3 and 4, the impact at the time of contact is higher than in the conventional configuration. The power is small and the bounce power is weak. Therefore, even if the shutter blades 3 and 4 come into contact with the stopper shafts 1e and 1f, the shutter blades 3 and 4 are stopped without being broken or bounced and temporarily closing a part of the opening 1a. After that, when the coil 7 is de-energized, the imaging standby state shown in FIG. 1 is restored.

  In the case of the present embodiment, it is not assumed that the next shooting is continuously performed (continuous shooting) after returning to the shooting standby state, and in the case of a digital camera, the shooting standby state is returned. At this time, since it is not so severe that a part of the opening 1a is temporarily closed due to the bounce, it is configured as described above. However, in the state shown in FIG. The stopper shaft 1 f may be slightly separated from the shutter blade 4. The operation of the present embodiment has been described as a so-called normally open type shutter device. However, by providing the camera with an optical viewfinder, the state shown in FIG. 3 is set before shooting, and the release button is pressed during shooting. If the photographing is started after the shutter blades 3 and 4 are brought into the state shown in FIG. 1 in the initial stage, a so-called normally closed type shutter device is obtained. And it goes without saying that the shutter device of this embodiment can also be adopted in a camera using a silver salt film by operating the shutter blades 3 and 4 in the same manner.

  4 and 5 show the second embodiment. 4 is a plan view showing the blade chamber in the fully open state (shooting standby state) of the shutter, as in FIG. 1, and FIG. 5 is a closed state of the shutter, as in FIG. It is the top view which showed the blade | wing chamber in. As can be seen by comparing FIGS. 4 and 5 with FIGS. 1 and 3, the configuration of the present embodiment is different from the configuration of the first embodiment in the shutter blades 3 and 4 of the first embodiment. In this embodiment, the overhang portions 3c and 4c are not provided, whereas the overhang portions 3c and 4c are provided. Since the other configuration is exactly the same as that in the first embodiment, the reference numerals used in FIGS. 1 and 3 are used as they are in FIGS. 4 and 5. Therefore, the configuration description of Example 1 is used as it is for the configuration description thereof. In addition, since the operation of the present embodiment is performed in accordance with the operation of the first embodiment, description thereof is omitted to avoid duplication.

  By the way, in the structure of said Example 1, the overlapping relationship of base end part 3a, 4a and the overlapping relationship of overhang | projection parts 3c, 4c are reverse. And these overhang | projection parts 3c and 4c are provided between the base end parts 3a and 4a and the light-shielding parts 3d and 4d. That is, the shutter blades 3 and 4 must have an overlapping relationship opposite to the base end portions 3a and 4a. Therefore, when the shutter blades 3 and 4 are closed, the light shielding portions 3d and 4d of the shutter blades 3 and 4 are tried to be in close contact with each other, and when operated, the base end portions 3a and 4a, the projecting portions 3c and 4c are shielded from each other. When the portions 3d and 4d and the tip portions 3b and 4b are in slidable contact with each other and the frictional resistance as described above is to be obtained more effectively, the shutter blades 3 and 4 are made flat like the conventional one. In some cases, it may be required to have a unique warped shape as shown in FIG. 2, but in the configuration of this embodiment, such a case is often not necessary. Become.

It is a top view of Example 1 which showed the blade room | chamber interior in the fully open state (photographing standby state) of a shutter. 1 is a cross-sectional view of Example 1. FIG. It is the top view of Example 1 which showed the blade chamber in the closed state of a shutter. It is a top view of Example 2 which showed the blade room | chamber interior in the fully open state (photographing standby state) of a shutter. It is the top view of Example 2 which showed the blade chamber in the closed state of a shutter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground plate 1a, 2a Opening part 1b, 2b, 3e, 4e Long hole 1c, 1d Blade shaft 1e, 1f, 1g, 1h Stopper shaft 1i, 1j, 1m, 1n Mounting shaft 1k Rotor shaft 2 Cover plate 2c, 2d, 3f, 4f holes 3, 4 Shutter blades 3a, 4a Base end 3b, 4b Tip 3c, 4c Overhang 3d, 4d Light-shielding part 5 Rotor 5a Body 5b Arm 5c Drive pin 6 Stator frame 6a Bobbin 7 coil 8 yoke

Claims (3)

  A base plate having an opening for a photographing optical path, and a base hole having a long hole, and a part of the base end is rotatably attached to the base plate. A first shutter blade having a light-shielding portion for opening and closing the opening, and a base hole that overlaps with the base end of the first shutter blade has a long hole and the base end A part of a portion is rotatably attached to the base plate, and a light-shielding portion provided on the distal end side to open and close the opening is opposite to the overlap between the base ends. A drive pin fitted in both the second shutter blade assembled to overlap the light shielding portion of the first shutter blade and the elongated hole of the two shutter blades; Reciprocally actuate the two shutter blades in opposite directions at the same time. By comprising driving means for by rolling perform opening and closing operation of the opening, the camera shutter apparatus according to claim.   The two shutter blades have an overhanging portion that overlaps oppositely to the base end portions and is in sliding contact with each other during the opening / closing operation, between the base end portion and the light shielding portion. The camera shutter device according to claim 1.   2. The camera shutter device according to claim 1, wherein the two shutter blades are overlapped with each other at the leading ends opposite to the base ends, and are in sliding contact during the opening / closing operation.