JP2016206305A - Blade drive device and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blade drive device and imaging device that effectively prevent reduction in image quality, and are further advantageous to downsizing.SOLUTION: A blade drive device comprises: an opening formation member that forms an opening part through which light passes; a blade that enters and retreats into/from the opening formation member; and blade drive means that engages with an end part of the blade to drive the blade. The blade drive means causes an engage action part engaging with the end part of the blade to reciprocate within a prescribed range, thereby causes the blade to enter into and retreat from the blade with respect to the opening part. In the opening formation member, a pair of abutting end parts against which a part of the reciprocating engage action part abuts respectively upon reciprocating is provided on an outer side of the opening part where, in each of the pair of the abutting end parts, provided is an impact absorption member against which the part of the engage action part abuts before abutting against each of the pair of abutting end parts to thereby substantially absorb an impact when the part of the engage action part abuts against the pair of the abutting end parts.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a blade driving device that drives a blade, and an imaging device including the blade driving device.

  Conventionally, a long hole is provided in the base plate having an opening through which light passes, and the output pin of the rotor for rotating the blades is reciprocated in the long hole, and the output pin in the long hole is reciprocated. There is known a blade driving device that causes a shutter blade to travel through an opening (see Patent Document 1).

JP 2005-106987 A

  In the blade driving device of Patent Document 1 described above, when the output pin reciprocates in the long hole by the rotation of the rotor, when the output pin comes into contact with the end of the long hole, the rotor is affected by the impact at that time. A bouncing motion that rotates in the opposite direction may occur. As the rotor bounces, the blades that should cover the opening also work together. As a result, re-exposure occurs and image quality may be degraded. In addition, if the blade is enlarged, the re-exposure due to the bounce can be reduced, but the blade driving device is enlarged.

  The present invention provides a blade driving device and an imaging device that effectively prevent image quality degradation associated with bouncing and are advantageous for downsizing.

The blade driving device of the present invention includes an opening forming member that forms an opening through which light passes, a blade that enters and exits the opening, a blade driving unit that engages with an end of the blade and drives the blade. The blade drive means reciprocates an engagement operation portion that engages with an end portion of the blade within a predetermined range, thereby moving the blade into and out of the opening to form the opening. The member is provided with a pair of abutting end portions on the outside of the opening portion, each of which is a part of the engaging operation portion that reciprocates, and the pair of abutting portions are disposed outside the opening portion. A part of the engagement operation part before contacting each of the end parts abuts, so that a shock when the part of the engagement operation part contacts the pair of contact end parts is substantially absorbed. An impact absorbing member is provided.
In such an aspect of the present invention, since a part of the engagement operation portion that engages with the end portion of the blade comes into contact with the shock absorbing member and then decelerates, the bounce can be reduced. It is possible to effectively prevent deterioration in image quality due to bounce. Further, since it is not necessary to increase the size of the blade in order to prevent the image quality from being lowered due to the bounce, it is extremely advantageous for reducing the size of the apparatus.

In the present invention, the engagement operation portion includes a blade engagement pin that engages with a blade engagement hole provided at an end portion of the blade, and the drive arm rotates on the opening forming member. The shock absorbing member is formed of a rotating ring member that rotates coaxially with the rotation axis of the drive arm, and a contact pin provided on the drive arm is inserted into the rotating ring member. The contact pin is arranged closer to the rotation shaft than the blade engagement pin, and the blade engagement pin of the drive arm that reciprocates is the pair of contact pins. Before contacting the contact end portion, the contact portion contacts each of both end portions of the pin engagement hole.
In such an aspect of the present invention, the bounce of the drive arm is suppressed because the abutment pin of the drive arm comes into contact with the impact absorbing member before coming into contact with the end of the long hole.

Moreover, in the said invention, the said rotation ring member is piled up two, The said pin engagement hole of one rotation ring member is formed smaller than the said pin engagement hole of the other rotation ring member, The contact pin contacts the end of the pin engaging hole of the other rotating ring member, and then contacts the end of the pin engaging hole of the other rotating ring member. It contacts with one contact edge part among a pair of said contact edge parts, It is characterized by the above-mentioned.
In this aspect of the present invention, the bounce of the drive arm is more effectively suppressed because the drive arm engagement pin is brought into contact with the rotating ring member and decelerated in multiple stages before coming into contact with the end of the long hole. Is done.

In the present invention, the engagement operation portion includes a blade engagement pin that engages with a blade engagement hole provided at an end portion of the blade, and the drive arm rotates on the opening forming member. The shock absorbing member is formed of a rotating ring member that rotates coaxially with the rotation axis of the drive arm, and a reciprocating operation is performed on a surface of the rotating ring member on the side of the engaging operation portion. An abutting pin that abuts against a pin abutting portion provided on the drive arm is provided.
In this aspect of the present invention, the bounce of the drive arm is effectively reduced by bringing the contact pin provided on the rotating ring member that rotates coaxially with the rotation axis of the drive arm into contact with the drive arm and decelerating the drive arm. It is suppressed.

Note that the present invention can be widely applied to an imaging apparatus including the above-described blade driving device.
According to this aspect of the present invention, it is possible to realize a highly reliable imaging apparatus that effectively prevents image quality degradation associated with bouncing.

  According to the present invention, it is possible to realize a blade driving device and an imaging device that can effectively prevent image quality deterioration due to bouncing and are advantageous for downsizing.

The disassembled perspective view of the blade | wing drive device which concerns on Embodiment 1 of this invention. FIG. 2 is a schematic plan view showing a blade opening state of the blade driving device according to the first embodiment. FIG. 3 is a schematic plan view illustrating a blade closing operation of the blade driving device according to the first embodiment. FIG. 3 is a schematic plan view showing a blade closed state of the blade driving device according to the first embodiment. FIG. 3 is a schematic plan view illustrating a blade opening operation of the blade driving device according to the first embodiment. The disassembled perspective view of the blade | wing drive device which concerns on Embodiment 2 of this invention. FIG. 5 is a schematic plan view showing a blade opening state of a blade driving device according to a second embodiment. FIG. 6 is a schematic plan view illustrating a blade closing operation of the blade driving device according to the second embodiment. FIG. 6 is a schematic plan view illustrating a blade closing operation of the blade driving device according to the second embodiment. FIG. 6 is a schematic plan view showing a blade closed state of the blade driving device according to the second embodiment.

Hereinafter, embodiments of the present invention will be described in detail.
In the present invention, when the engagement operation portion that operates by engaging with one or a plurality of blades is brought into contact with the pair of contact end portions and is turned back and forth, the contact operation is performed before the contact with the pair of contact end portions. The impact absorbing member is brought into contact with the engaging operation portion in advance to substantially absorb the impact when the engaging operation portion comes into contact with the pair of contact end portions.

  As a result, since the engagement operation portion is decelerated by contact with the impact absorbing member and then comes into contact with the pair of contact end portions, the engagement operation portion when the contact is made with the pair of contact end portions. Since bounce can be effectively reduced, the traveling of the blades engaged with the engagement operation portion can be stabilized. Accordingly, since the opening through which light passes can be opened and closed with high accuracy by the blades, it is possible to effectively prevent the image quality deterioration due to the bounce.

  In addition, since the bounce operation can be effectively reduced as described above, the present invention does not need to increase the outer shape of the blade to prevent the bounce, for example, and is extremely effective for downsizing the blade driving device. In addition, energy saving drive can be realized, and the power source such as a drive motor can be reduced. The present invention is applicable when a light-shielding blade that enters and exits a path through which light passes, or drives an optical filter as a blade, or a blade equipped with an optical filter, or the like.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<Embodiment 1>
FIG. 1 shows an exploded perspective view of a blade driving device according to Embodiment 1 of the present invention, and FIGS. 2 to 5 show schematic plan views showing opening and closing operations of the blade driving device of FIG.

  As shown in the figure, the blade driving device of the present embodiment is a shutter device including two shutter blades. Specifically, two shutter blades that are reciprocated simultaneously in opposite directions by one driving means start to open from the center of the exposure opening when performing the opening operation, and exposure when performing the closing operation. It is a shutter device configured to close the central part of the opening last.

  Note that this type of shutter device can be applied to a camera using a silver salt film as well as a digital camera including a camera for various information terminal devices, but the operation of this embodiment is applied to a digital camera. The case where it is adopted will be described.

  First, the configuration of the present embodiment will be described mainly with reference to FIG. The base plate 1 of the present embodiment is made of a synthetic resin, and as shown in FIG. 1, an opening 1b for a subject optical path having a circular shape is formed at a substantially central portion thereof. A cover plate 4 is attached to the base plate 1 at a predetermined interval, and a single blade chamber is formed between the two.

  Although this cover plate 4 is shown only in FIG. 1 and is omitted in the subsequent drawings, the planar shape is substantially the same as that of the ground plate 1, and a subject optical path having a circular shape at a substantially central portion thereof. An opening is formed. Since the opening 1b has a smaller diameter than the opening, the exposure opening in the present embodiment is regulated by the opening 1b. The cover plate 4 is attached to the main plate 1 with screws at a plurality of locations, although not shown.

  As shown in FIG. 1, a rotating ring member 5, a rotor 6 that is an electromagnetic actuator, a yoke 7, a coil 8, and a fixed frame 9 are attached to the outer side of the blade chamber of the base plate 1. The rotor 6 according to the present embodiment includes a cylindrical permanent magnet 6d magnetized in two poles in the radial direction, and a synthetic resin drive pin portion 6a and contact pins 6b integrated with the permanent magnet. The hole 6c and the shaft 1h of the main plate 1 are fitted and rotatably attached.

  The drive pin 6 a is inserted into the blade chamber from a well-known hole 1 a formed in an arc shape on the base plate 1, and the tip thereof is inserted into a hole having the same shape on the cover plate 4. In the present embodiment, the drive pins 6a are made of synthetic resin, but it is also known that they are made of permanent magnets.

  The rotating ring member 5 has a hole 5a, and the hole 5b and the shaft 1g of the base plate 1 are fitted and attached so as to be rotatable. Here, since the shafts 1g and 1h of the main plate 1 are coaxial, the drive pin 6 and the rotation ring 5 rotate coaxially. The yoke 7 is not shown in a planar shape, but is substantially U-shaped like the yoke, and one of the two leg portions is inserted into the hollow portion of the coil 8, and is fixed to the ground plane 1 by the fixing frame 9. It is fixed.

  Two blade shafts 1c and 1c and two stopper shafts 1e and 1f are erected on the surface of the base plate 1 on the blade chamber side by integral molding. Two shutter blades 2 and 3 are arranged in the blade chamber. Among them, the shutter blade 2 disposed on the base plate 1 side has a long hole 2a, and the hole 2b and the blade shaft 1d are fitted and rotatably mounted.

  On the other hand, the shutter blade 3 disposed on the cover plate 4 side has a long hole 3a, and the hole 3b and the blade shaft 1c are fitted and rotatably mounted. The drive pins 6 a of the rotor 6 are fitted in the long holes 2 a and 3 a of the shutter blades 2 and 3.

  Next, the operation of this embodiment will be described. FIG. 2 is a schematic diagram showing a photographing standby state, and the shutter blades 2 and 3 have the opening 1b fully opened. For this reason, a solid-state image sensor (not shown) is exposed to subject light, and the photographer can observe the subject image on the monitor.

  At this time, the coil 8 of the electromagnetic actuator is not energized. However, as is well known, at this time, the rotor 6 is urged to rotate in the clockwise direction due to the opposing arrangement relationship between the magnetic pole of the permanent magnet 6d and the two magnetic pole portions of the yoke 7. The drive pin 6a is given a force that moves substantially downward in FIG. 2 and rotates the shutter blades 2 and 3 in opposite directions. Since the shutter blades 2 and 3 are in contact with the stopper shafts 1g and 1h, and the drive pin 6a is in contact with the hole 1a of the main plate 1 as shown in FIG. Yes.

  When the release button is pressed at the time of shooting, the charge accumulated in the solid-state image sensor is released, shooting is started, and new charge is accumulated in the solid-state image sensor. When a predetermined time elapses, a forward current is supplied to the coil 8 by a signal from the exposure time control circuit.

  Therefore, the rotor 6 is rotated clockwise, and the drive pin 6a is moved substantially upward in FIG. 2, so that the shutter blade 2 is rotated clockwise and the shutter blade 3 is rotated counterclockwise. Is done. Accordingly, the two shutter blades 2 and 3 close the opening 1b.

  After that, as shown in FIG. 3, when the shutter blades 2 and 3 finish covering the central portion of the opening 1b, the rotor 6 rotates at the rotational speed by the contact between the contact pin 6b and the hole 5a of the rotating ring member 5. Is rotated integrally with the rotating ring member 5 while being decelerated. After that, as shown in FIG. 4, the drive pin 6a of the rotor 6 is stopped by abutting against the hole 1a of the base plate 1, and the shutter blades 2, 3 are also brought into contact with the stopper portions 1e, 1f of the base plate 1 while being decelerated. The rotation is stopped.

  In this manner, when the state shown in FIG. 4 is reached, the electric charge accumulated in the solid-state imaging device is transferred to the storage device as imaging information. When the transfer is completed, a reverse current is supplied to the coil 8 unlike the above, so that the rotor 6 is rotated counterclockwise, and the drive pin 6a is substantially omitted in FIG. Move it down.

  Therefore, the shutter blades 2 and 3 are rotated in opposite directions to open the opening 1b from the substantially central portion. When the shutter blades 2 and 3 fully open the opening 1b as shown in FIG. 8, the drive pin 6a is brought into contact with the contact pin 6b and the hole 5a of the rotating ring member 5 as shown in FIG. It rotates integrally with the rotating ring member 5 while the rotational speed is reduced. Thereafter, the rotor 6 and the blades 2 and 3 continue to rotate while being decelerated, stop by contacting the holes 1a and stoppers 1e and 1f of the base plate, respectively, and return to the state shown in FIG.

  Note that, as in this embodiment, the contact pin 6b of the rotor 6 is preferably disposed closer to the hole 6c than the drive pin 6a in order to weaken the impact force when contacting the rotating ring member 5. .

  Further, the operation of the present embodiment has been described in the case where it is adopted in a digital camera. However, in the case where it is adopted in a silver salt film camera, the state shown in FIG. Shooting is performed by opening and closing operations 3.

  Thus, according to this embodiment, since the shutter blades 2 and 3 are brought into contact with the stoppers 1e and 1f of the base plate 1 while being decelerated by the rotating ring member 5, the impact force can be reduced. 3 is advantageous for durability and bounce. The blades 2 and 3 are decelerated by the rotating ring member 5 in the shutter closing operation after the blades 2 and 3 have shielded the opening 1b of the base plate 1 and in the shutter opening operation. Since the blades 2 and 3 are after the opening 1b of the main plate 1 is fully opened, there is no influence on the shutter speed.

<Embodiment 2>
The blade drive measure of this embodiment is the same as that of Embodiment 1 except that two rotating ring members 5 and 10 are used in an overlapping manner as shown in FIG. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  Next, the operation of this embodiment will be described. FIG. 7 is a schematic diagram showing a shooting standby state. As shown in FIG. 6, the rotating ring members 5 and 10 are arranged so as to overlap each other. The rear side of the drawing is the rotating ring member 10, and the front side is the rotating ring member 5. As a feature of the present embodiment, the hole 10 a of the rotating ring member 10 is narrower than the hole 5 a of the rotating ring member 5. At this time, the coil of the electromagnetic actuator is not energized, but the rotor 6 is rotated clockwise by the opposing arrangement relationship between the magnetic pole of the permanent magnet 6d and the two magnetic pole portions of the yoke 7, as in the first embodiment. Accordingly, the drive pin 6a moves substantially downward in FIG. 7, and the drive pin 6a contacts the hole 1a of the main plate 1 as shown in FIG. This state is maintained because it is blocked.

  When a forward current is supplied to the coil in accordance with a photographing instruction, the rotor 6 is rotated clockwise, and the drive pin 6a is moved substantially upward in FIG. Close 1b. Thereafter, when the shutter blades have completely covered the central portion of the opening 1b, the rotor 6 decelerates the rotation speed by the contact between the contact pin 6b and the hole 10a of the rotating ring member 10, as shown in FIG. While rotating, it rotates integrally with the rotating ring member 10.

  Thereafter, as shown in FIG. 9, the rotor 6 is integrated with the rotating ring members 5 and 10 while the rotation speed is further reduced by the contact between the contact pin 6b and the hole 5a of the rotating ring member 5. Rotate. Thereafter, as shown in FIG. 10, the drive pin 6 a of the rotor 6 is stopped by contacting the hole 1 a of the base plate 1, and the shutter blades are also stopped by being brought into contact with the stopper portion of the base plate 1 while being decelerated.

  In this way, when the state shown in FIG. 10 is reached, the electric charge accumulated in the solid-state imaging device is transferred to the storage device as imaging information. When the transfer is completed, a reverse current is supplied to the coil, unlike the above, so that the rotor 6 is rotated counterclockwise, and the drive pin 6a is moved substantially downward in FIG. I will move to. Therefore, the shutter blades are rotated in opposite directions, and the opening 1b is opened from its substantially central portion.

  When the shutter blades fully open the opening 1b, the drive pin 6 comes into contact with the contact pin 6b and the hole 10a of the rotation ring member 10, so that the rotation speed is reduced and the drive pin 6 is integrated with the rotation ring member 10. And rotate. Thereafter, the rotor 6 rotates together with the rotating ring members 5 and 10 while the rotation speed is further reduced by the contact between the contact pin 6b and the hole 5a of the rotating ring member 5.

  Thereafter, as shown in FIG. 10, the driving pin 6a of the rotor 6 is brought into contact with the hole 1a of the base plate 1 and stopped, and the shutter blade is also brought into contact with the stopper portion of the base plate 1 while being decelerated. It will return to the state of FIG.

  Thus, according to the present embodiment, the shutter blade contacts the stopper of the base plate 1 while being decelerated in two stages by the rotating ring members 5 and 10, so that the impact force can be reduced, and the durability of the shutter blade is increased. It is advantageous for sex and bounce. The shutter blade is decelerated by the rotating ring members 5 and 10 after the shutter has closed the opening 1b of the base plate 1 in the shutter closing operation, and in the shutter opening operation, the shutter blade is decelerated. However, since the opening 1b of the base plate 1 is fully opened, there is no influence on the shutter speed.

DESCRIPTION OF SYMBOLS 1 ... Ground plane 1a ... Hole 1b ... Opening part
1c, 1d ... blade shaft 1e, 1f ... blade stopper shaft 1g, 1h ... shaft 2 ... blade 2a ... long hole 2b ... hole 3 ... blade 3a ... long Hole 3b ... Hole 4 ... Cover plate 5 ... Rotating ring members 5a, 5b ... Hole 6 ... Rotor 6a ... Drive pin 6b ... Contact pin 6c ... Hole 6d ... Permanent magnet 7 ... Yoke 8 ... Coil 8a ... Winding 9 ... Fixed frame 10 ... Rotating ring members 10a, 10b ... Hole

Claims (5)

An opening forming member that forms an opening through which light passes;
Blades entering and exiting the opening;
Blade driving means for engaging the end of the blade and driving the blade,
The blade driving means causes the blade to move in and out of the opening by reciprocating an engagement operation portion that engages with an end of the blade within a predetermined range.
The opening forming member is provided with a pair of abutting end portions on the outer side of the opening portion, each of which engages a part of the reciprocating engagement operation portion when folded.
A part of the engagement operation part is brought into contact with the pair of contact end parts before coming into contact with each of the pair of contact end parts on the outside of the opening part. A blade driving device comprising an impact absorbing member that substantially absorbs an impact when contacting the end portion. The engagement operation part is a drive arm that has a blade engagement pin that engages with a blade engagement hole provided at an end of the blade and rotates on the opening forming member.
The shock absorbing member is formed of a rotating ring member that rotates coaxially with the rotation axis of the drive arm,
The rotating ring member is provided with a long pin engagement hole through which a contact pin provided on the drive arm is inserted,
The contact pin is disposed closer to the rotation shaft than the blade engagement pin, and the pin engagement before the blade engagement pin of the drive arm that reciprocates contacts the pair of contact end portions. The blade driving device according to claim 1, wherein the blade driving device abuts on both ends of the joint hole. Two rotating ring members are stacked, and the pin engaging hole of one rotating ring member is formed smaller than the pin engaging hole of the other rotating ring member,
The contact pin contacts the end of the pin engaging hole of the other rotating ring member, and then contacts the end of the pin engaging hole of the other rotating ring member. The blade driving device according to claim 2, wherein the blade driving device is in contact with one of the pair of contact end portions. The engagement operation part is a drive arm that has a blade engagement pin that engages with a blade engagement hole provided at an end of the blade and rotates on the opening forming member.
The shock absorbing member is formed of a rotating ring member that rotates coaxially with the rotation axis of the drive arm,
An abutting pin that abuts against a pin abutting portion provided on the drive arm that reciprocates is provided on a surface of the rotating ring member on the side of the engaging operation portion. The blade driving device according to claim 1.   An imaging apparatus comprising the blade driving device according to claim 1.

Images