JP6470119B2 - Blade driving device, shutter device, and imaging device - Google Patents

Description

  The present invention relates to a blade driving device that drives a blade that enters and exits a path through which light passes, a shutter device that includes the blade driving device, and an imaging device that includes the blade driving device.

  As a camera lens shutter, there is known a structure in which a shutter blade is disposed at a position close to a photographing lens and a circular photographing optical path opening is opened and closed by the shutter blade (see Patent Document 1). In the camera blade drive mechanism of Patent Document 1, a long hole is provided in the main ground plate, and the output pin of the rotor reciprocates in the long hole, and the shutter blade engaged with the output pin is on the main ground plate. The shutter blade is brought into contact with the stopper and stopped at each end stage of the closing operation or opening operation of the shutter blade.

Japanese Patent Laid-Open No. 2005-24640

  In the camera blade driving device as in Patent Document 1, the output pin is brought into contact with the end of the long hole provided in the main base plate, so that the impact at the time of contact is transmitted to the shutter blade. A so-called bounce operation occurs in which the operation of the shutter blades is not stable. Note that the bounce operation is not limited to the contact of the output pin described above, and occurs, for example, when the shutter blade itself is brought into contact with a stopper or the like to stop the operation of the shutter blade.

  The present invention provides a blade driving device, a shutter device, and an imaging device that can realize a highly accurate blade driving by reducing a bounding operation.

The blade drive 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, and a power transmission member that engages the blade and transmits power. The power transmission member is rotatably held with respect to the opening forming member, and a sliding portion having a first inclined surface provided in the power transmission member is engaged with the opening forming member and the power A contact portion provided on the opening forming member is provided in the process of rotating the power transmission member provided with a sliding portion having a second inclined surface slidably contacting the first inclined surface as the transmission member rotates. Of the power transmission member before the operation of the blade is stopped by the contact of the blade with respect to the contact of the blade and the engaging portion of the power transmission member with the contact portion provided in the opening forming member. Any before the operation stops In timing, wherein the sliding contact with said first inclined surface and the second inclined surface.
According to this aspect of the present invention, the impact of the blades coming into contact with the contact portion, or the impact of the contact portions of the blade and the power transmission member coming into contact with the contact portion is caused by the sliding contact between the first slope and the second slope. Since it can be reduced by physical resistance (friction), highly accurate blade driving can be realized.

Moreover, in the said invention, the said opening formation member has a through-hole penetrated in the thickness direction, and the said power transmission member is opposite to the one surface side of the said opening formation member in which the said blade | wing is arrange | positioned. An engaging pin that is disposed on the other surface side and engages with an engaging hole of the blade through the through-hole, and the engaging pin constitutes an engaging portion of the blade and the power transmission member; The end portion of the through hole may constitute an abutting portion provided in the opening forming member with which the engaging pin comes into contact with the rotation of the power transmission member.
According to this aspect of the present invention, it is possible to reduce the bounce operation that occurs when the engagement pin comes into contact with the end of the through hole.

Moreover, in the said invention, the said sliding part protrudes and is provided in the upper end part by the side of the said opening formation member among the said power transmission members, and the said to-be-slid part is the said power transmission member among the said opening formation members. May be provided corresponding to the sliding portion at a portion where the is mounted.
According to this aspect of the present invention, the sliding portion provided protruding from the power transmission member is in sliding contact with the sliding portion of the opening forming member, so that an appropriate brake is applied to the rotation of the power transmission member. be able to.

Further, in the present invention, the power transmission member moves from the opening forming member in the axial direction of the rotary shaft portion when the first slope is in sliding contact with the second slope in the process of turning the power transmission member. A yoke which is movable in a direction away from the power transmission member, and is disposed so that an outer peripheral portion of the power transmission member opposite to the opening forming member side surrounds a body portion formed of a magnet; A driving means having a coil wound around a portion, and the power transmission member is biased toward the opening forming member by receiving a magnetic action with the driving means. Good.
According to this aspect of the present invention, the engagement stability between the power transmission member (sliding portion) and the opening forming member (sliding portion) can be realized by a magnetic action.

Further, the present invention broadly covers an image pickup apparatus such as a shutter device provided with the blade driving device described above or a camera provided with the blade driving device described above.
According to this aspect of the present invention, it is possible to realize a shutter device and an imaging device that can realize highly accurate blade driving with reduced bounding motion.

  According to the present invention, it is possible to realize a blade driving device, a shutter device, and an imaging device that can realize a highly accurate blade driving by reducing the bounce operation.

1 is an exploded perspective view of a shutter device (an example of a blade driving device) according to Embodiment 1 of the present invention. The schematic plan view seen from the blade drive system (fixed frame) side of FIG. The schematic plan view of the blade | wing full open state of FIG. FIG. 4 is a cross-sectional view of a main part of a blade driving unit in the blade fully opened state of FIG. 3. The schematic plan view at the time of the blade | wing closing operation | movement of FIG. FIG. 6 is a cross-sectional view of the main part of the blade driving means during the blade closing operation of FIG. 5. The schematic plan view in the blade | wing closing operation | movement of FIG. FIG. 8 is a cross-sectional view of the main part of the blade driving means during the blade closing operation of FIG. 7. The schematic plan view which shows the time of the fully closed operation | movement in the shutter apparatus (an example of a blade | wing drive device) which concerns on Embodiment 2 of this invention. FIG. 10 is a cross-sectional view of the main part of the blade driving means during the fully closing operation of FIG. 9. The schematic sectional drawing which shows the modification structural example of the drive means of the blade | wing which concerns on other embodiment of this invention.

Hereinafter, the present invention will be described in detail based on embodiments.
The present invention is a timing before contacting at least one of the blade or the power transmission member that transmits power to the blade against the contact portion provided in the opening forming member that forms the opening through which light passes. A part of the power transmission member is brought into sliding contact with a part of the opening forming member, thereby generating a physical resistance (friction) between them, and mitigating an impact when contacting the contact part. There is a feature in the point.

  Specifically, in the process of moving the blade into and out of the opening through which light passes, the power transmission member that transmits power to the blade and the opening forming member are temporarily connected at a timing before temporarily stopping the traveling of the blade. By causing the brake force to come into sliding contact, it is possible to effectively reduce the bouncing action associated with the stoppage of the blades.

  For example, 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, and a power transmission member that engages the blade and transmits power. The power transmission member is rotatably held with respect to the opening forming member. The opening forming member is provided with a slidable portion corresponding to the sliding portion having the first inclined surface provided on the power transmission member, and the second inclined surface slidably contacting the first inclined surface is provided on the slidable portion. Is provided. And in the process in which a power transmission member rotates, a 1st slope and a 2nd slope are made to slide at the predetermined timing before the driving | running | working stop of a blade | wing. Thereby, the impact generated when the blades stop traveling is reduced by the braking action caused by the friction between the first slope and the second slope.

  Here, the “predetermined timing” is, for example, the timing before the blade is brought into contact with the contact portion provided in the opening forming member, or the power transmission member at the contact portion provided in the opening forming member. The timing before a part of the contact is made. The contact portion may be provided integrally with the opening forming member, or may be provided by joining another member to the opening forming member.

  More specifically, the opening forming member may be provided with a stopper that contacts the end of the blade on the surface on which the blade travels, and the stopper may be used as the contact portion. Alternatively, when the engaging pin of the power transmission member is engaged with the blade through the through hole of the opening forming member, the engaging pin is brought into contact with the end of the through hole. The part becomes a contact part.

  In any case, the present invention mitigates (reduces) the impact generated when stopping the travel of the blade through the physical contact action in the travel process of the blade using the physical sliding action. is there.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(Embodiment 1)

  In the following embodiments, when two shutter blades that are reciprocated simultaneously in the opposite directions by the same driving means start to open from the center of the exposure opening when performing the opening operation, and perform the closing operation. Will be described by taking as an example a shutter device configured to close the center of the exposure opening last. Note that this type of shutter device can be employed in cameras that use silver halide films as well as digital cameras including cameras for various information terminal devices, but the operation of this embodiment is mainly digital. The case where it is employed in a camera will be described.

  FIG. 1 is an exploded perspective view showing a configuration of a shutter device which is an example of a blade driving device according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged plan view of a main part of FIG. 3 is a schematic plan view of the blade fully opened in FIG. 1, and FIG. 4 is an enlarged cross-sectional view of the main part of FIG. 5 is a schematic plan view of the blade closing operation of FIG. 1, and FIG. 6 is an enlarged cross-sectional view of the main part of FIG.

  As shown in FIG. 1, the shutter device of the present embodiment includes a ground plane (an example of an opening forming member) 1 in which an opening 1 b through which light passes is formed, and a ground plane 1 disposed on one surface side of the ground plane 1. Cover plate 4 that forms a traveling space for blades 2 and 3 between them and drive means that is disposed on the other surface side of base plate 1 and drives blades 2 and 3.

  The base plate 1 is, for example, a synthetic resin substrate in the present embodiment, and as shown in FIG. 1, a circular opening 1b for a subject optical path is provided at a substantially central portion thereof. . On the other hand, a cover plate 4 is attached to the base plate 1 at a predetermined interval, and one 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. That is, the ground plate 1 and the cover plate 4 are examples of opening forming members each having an opening through which light passes.

  Here, since the diameter of the opening 1b of the base plate 1 is smaller than that of the opening of the cover plate 4, the exposure opening in the present embodiment is regulated by the opening 1b.

  Although not shown, the cover plate 4 is attached to the base plate 1 with screws at a plurality of locations.

  As shown in FIG. 1, a rotor 6, a yoke 7, a coil 8, and a fixed frame 9, which are electromagnetic actuators serving as blade driving means, are attached to the outside of the blade chamber of the base plate 1. For example, the rotor 6 of the present embodiment includes a cylindrical permanent magnet 6d magnetized in two radial directions and a synthetic resin drive pin portion 6a integrated with the permanent magnet. The hole 6c and the shaft 1j of the base plate 1 are fitted, and the shaft 6e and the hole 9a of the fixed frame 9 are fitted to each other so as to be rotatable.

  The drive pin 6 a is inserted into the blade chamber through a hole (through hole) 1 a formed in an arc shape in the base plate 1, and its tip is inserted into a hole having the same shape as the cover plate 4. In the present embodiment, the drive pins 6a are made of synthetic resin, but they may be made of permanent magnets.

  Here, the base plate 1 is provided with a slidable contact portion 1g formed with end portions (second inclined surfaces) 1i and 1h having a predetermined inclination, which are in sliding contact with the rotor 6. On the other hand, the rotor 6 side has an end portion (first slope) 6b having a predetermined inclination with which the sliding contact portion 1g (end portions 1i, 1h) is slidably contacted. As shown in FIG. 2, they are on the same circumference. The yoke 7 is not shown in a plan view, but has a substantially U shape. One of the two leg portions is inserted into the hollow portion of the coil 8 and is fixed to the main plate 1 by a fixing frame 9. .

  Two blade shafts 1c, 1d and two stopper shafts 1e, 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 6a of the rotor 6 are fitted in the long holes 2a and 3a of the shutter blades 2 and 3, respectively.

  Next, the operation of this embodiment will be described. FIG. 3 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, at this time, the rotor 6 is urged to rotate in the clockwise direction by the opposing arrangement relationship between the magnetic poles of the permanent magnet 6d and the two magnetic pole portions of the yoke 7, thereby causing the drive pin 6a to be urged. 2 is moved substantially downward in FIG. 2 and is given a force to rotate the shutter blades 2 and 3 in opposite directions.

  The shutter blades 2 and 3 are in contact with the stopper shafts 1g and 1h. Further, as shown in FIG. 3, the drive pin 6a is in contact with the hole 1a of the main plate 1 and is prevented from rotating. Yes. 4 is a cross-sectional view showing the positional relationship between the sliding contact portion 1g, the end portions 1i, 1h of the base plate 1 and the end portion 6b of the rotor 6 at this time. Since the rotor 6 is biased substantially rightward in the figure by the opposing arrangement relationship between the magnetic pole of the permanent magnet 6d and the two magnetic pole portions of the yoke 7, the end 1h of the base plate 1 and the end 6b of the rotor 6 This maintains the state of sliding up the slope.

  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 counterclockwise in FIG. 3, and the drive pin 6a is moved substantially upward, so that the shutter blade 2 is rotated counterclockwise and the shutter blade 3 is rotated clockwise. Is done. As a result, the two shutter blades 2 and 3 rotate in a direction to close the opening 1b.

  Here, FIGS. 5 and 6 show the rotor 6 rotated counterclockwise by a predetermined phase in FIG. As shown in FIG. 6, the rotor 6 rotates while sliding down the slope by the end 6 b and the end 1 h of the main plate 1. After this, the rotor 6 continues to rotate, and when the two shutter blades 2 and 3 finish covering the central portion of the opening 1b as shown in FIG. 7, the rotor 6 ends as shown in FIG. 6b and the edge part 1i of the ground plate 1 contact | abut. Thereafter, the rotor 6 rotates while sliding up the slope while sliding between the end portion 6b of the rotor 6 and the end portion 1i of the main plate 1, thereby generating physical friction between the two. The rotational speed of the rotor 6 is temporarily reduced by the action.

  Then, as shown in FIG. 9, the drive pin 6a of the rotor 6 is brought into contact with the hole 1a of the base plate 1 and stopped, and the shutter blades 2 and 3 are also brought into contact with the stopper portions 1e and 1f of the base plate 1 while being decelerated. The rotation is stopped. As shown in FIG. 10, when the rotor 6 rotates while sliding up the slope by the end portion 6b and the end portion 1i of the main plate 1, the rotor 6 is substantially lower in the figure due to the attractive force between the yoke 7 and the permanent magnet 6d. Receive force in the direction. That is, the rotor 6 is urged toward the main plate 1 side under the magnetic action of the yoke 7 and the permanent magnet 6d. Thereby, the engagement stability of the rotor 6 and the ground plane 1 can be realized by a magnetic action. And the stronger frictional force will generate | occur | produce between the edge part 6b of the rotor 6, and the edge part 1i of the ground plane 1, and the rotor 6 can be decelerated efficiently.

  In this way, when the state shown in FIGS. 9 and 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 current in the reverse direction is supplied to the coil 8 unlike the above, so that the rotor 6 is rotated clockwise in FIG. 6a, and the drive pin 6a is rotated in FIG. And move it substantially downward.

  Therefore, the shutter blades 2 and 3 are rotated in opposite directions to open the opening 1b from the substantially central portion. Further, the rotor 6 rotates while sliding down the slope by the end 6b and the end 1i of the main plate 1 shown in FIG. 10, and returns to the state shown in FIG. Thereafter, the rotor 6 continues to rotate, and as shown in FIG. 6, the end 6b and the end 1h of the main plate 1 come into contact with each other, and the rotational speed is reduced by rotating while sliding up the slope. After that, 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 main plate, respectively, and return to the state shown in FIGS. Become.

  In addition, the operation of the present embodiment has been described in the case where it is adopted in a digital camera, but when it is adopted in a silver salt film camera, the state shown in FIG. 9 and FIG. Photographing is performed by opening and closing the shutter blades 2 and 3.

  Thus, according to the present embodiment, 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 end portions 1h and 1i of the base plate 1 and the end portion 6b of the rotor 6, The impact force can be reduced, which is advantageous for the durability and bounding of the shutter blades 2 and 3. The blades 2 and 3 are decelerated after the blades 2 and 3 have shielded the opening 1b of the main plate 1 in the shutter closing operation, and the blades 2 and 3 are moved in the shutter opening operation. Since it is after the opening 1b of the base plate 1 is fully opened, there is no influence on the shutter speed.

(Other embodiments)
In each of the above-described embodiments, the sliding contact between the inclined surfaces between the rotor and the ground plane is caused in accordance with the turn-back timing in the reciprocating operation of the blades. For example, as shown in FIG. 11 (a), power is transmitted to the blade only in one side of the reciprocating operation of the blade, that is, only when the opening through which light passes is fully opened or only fully closed. The inclined surface 6b of the power transmission member (rotor) and the inclined surface 1i of the opening forming member (base plate) may be brought into sliding contact.

  In each of the above-described embodiments, the description has been given of the structure in which the sliding portion serving as the convex portion is provided on the rotor side and the sliding portion serving as the concave portion is provided on the base plate side, but the present invention is of course limited to this. For example, as shown in FIG. 11B, a slope 6b is provided on a sliding portion that becomes a concave portion on the power transmission member (rotor) side, and a sliding portion that becomes a convex portion on the opening forming member (base plate) side. An inclined surface 1i may be provided in the part, and the engagement relationship of the unevenness may be reversed.

DESCRIPTION OF SYMBOLS 1 ... Base plate 1a ... Hole 1b ... Opening part 1c, 1d ... Blade | shaft axis | shaft 1e, 1f ... Blade | tip stopper shaft 1g ... Sliding contact part 1h, 1i ... End part 1j. .... Shaft 2 ... Blade 2a ... Long hole 2b ... Hole 3 ... Blade 3a ... Long hole 3b ... Hole 4 ... Cover plate 6 ... Rotor 6a ...・ Drive pin 6b ・ ・ ・ End 6c ・ ・ ・ Hole 6d ・ ・ ・ Permanent magnet 6e ・ ・ ・ Shaft 7 ・ ・ ・ Yoke 8 ・ ・ ・ Coil 8a ・ ・ ・ Winding 9 ・ ・ ・ Fixed frame 9a・ Hole

Claims (6)

An opening forming member that forms an opening through which light passes;
Blades entering and exiting the opening;
A power transmission member that engages the blade and transmits power;
The power transmission member is rotatably held with respect to the opening forming member,
The opening forming member has a second inclined surface engaged with a sliding portion having a first inclined surface provided on the power transmission member and slidingly contacting the first inclined surface as the power transmission member rotates. A sliding part is provided,
In the process of turning the power transmission member, before the operation of the blade is stopped by the contact of the blade with the contact portion provided in the opening forming member, or the contact provided in the opening forming member The first inclined surface and the second inclined surface are brought into sliding contact at any timing before the operation of the power transmission member is stopped by contact of the blade and the engaging portion of the power transmission member with respect to a portion. Feather drive device characterized. The opening forming member has a through-hole penetrating in the thickness direction,
The power transmission member is disposed on the other surface side opposite to the one surface side of the opening forming member on which the blade is disposed, and an engagement pin that engages with the engagement hole of the blade through the through hole. Have
The engagement pin constitutes an engagement portion of the blade and the power transmission member,
The end portion of the through hole constitutes an abutting portion provided in the opening forming member with which the engaging pin abuts as the power transmission member rotates. Blade drive device. The sliding portion is provided to protrude from an upper end portion of the power transmission member on the opening forming member side,
3. The blade driving device according to claim 1, wherein the sliding portion is provided corresponding to the sliding portion at a portion of the opening forming member where the power transmission member is mounted. 4. . The power transmission member is movable in a direction away from the opening forming member in the axial direction of the rotating shaft portion when the first slope is in sliding contact with the second slope in the process of turning the power transmission member. ,
A yoke disposed so that an outer peripheral portion of the power transmission member opposite to the opening forming member side surrounds a body portion formed of a magnet; and a coil wound around a part of the yoke; Comprising drive means having
4. The blade drive according to claim 1, wherein the power transmission member is biased toward the opening forming member by receiving a magnetic action with the driving unit. 5. apparatus.   A shutter device comprising the blade driving device according to claim 1. An imaging apparatus comprising the blade driving device according to claim 1.

Images