JP2017003840A - Blade driving device and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blade driving device that can achieve relatively stable blade driving and an imaging device.SOLUTION: A blade driving device comprises: an opening forming member that forms an opening through which light passes; blades that enter and exit from the opening; a blade driving member that rotates around the opening while engaged with the blades; and driving means that rotates the blade driving member. The driving means includes a driving force transmission member that is in contact with an end of the blade driving member from a direction substantially orthogonal to an optical axis direction to rotate the blade driving member; the blade driving member receives a driving force from the driving force transmission member while being urged on the driving force transmission member between the opening forming member and the driving force transmission member to rotate around the opening.SELECTED DRAWING: Figure 7

Description

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

  2. Description of the Related Art Conventionally, there is known a blade driving device that supports a blade member that opens and closes an opening for a base plate having an opening for an optical path, and operates the blade member in conjunction with a drive ring that rotates the blade member. (See Patent Document 1)

JP 2012-73383 A

  Here, for example, when the blade member is configured to open and close the opening in conjunction with the driving ring that rotates around the opening, as in the blade driving device of Patent Document 1, the ground plate that supports the driving ring. If there is a variation in the gap between the support structure and the drive ring, the drive ring drive is not stable, and there is a possibility that the blade drive may be affected.

  The present invention provides a blade driving device and an imaging device that can realize relatively stable blade driving.

The blade drive device of the present invention rotates around the opening in an engaged state with the opening forming member that forms an opening through which light passes, the blade that enters and exits the opening, and the blade. A blade driving member; and a driving means for rotating the blade driving member. The driving means contacts the end of the blade driving member from a direction substantially orthogonal to the optical axis direction and drives the blade. A power transmission member that transmits power for rotating the member, and the blade driving member is urged toward the power transmission member between the opening forming member and the power transmission member. The power transmission member receives power from the power transmission member and rotates around the opening.
According to this aspect of the present invention, since the blade driving member rotates while being biased toward the power transmission member, more stable blade driving can be realized.

In the present invention, the blade driving member is urged toward the power transmission member by an urging portion provided in the opening forming member, and is gripped between the urging portion and the power transmission member. It is characterized by rotating around the opening in a state where
According to this aspect of the present invention, by providing the opening forming member with the biasing portion that biases the blade driving member toward the power transmission member, more stable blade driving can be realized with a simple configuration.

In the present invention, the blade driving member is provided at the end of the blade driving member opposite to the portion with which the power transmission member abuts, and abuts against the opening forming member and elastically deforms. The elastic deformation portion is biased toward the power transmission member and rotates around the opening in a state of being gripped between the opening forming member and the power transmission member.
According to this aspect of the present invention, since the blade driving member includes the portion that is elastically deformed with respect to the opening forming member, more stable blade driving can be realized with a simple configuration.

In the present invention, a plurality of the urging portions are provided along the rotation direction of the blade driving member.
According to this aspect of the present invention, the rotation operation of the blade driving member can be further stabilized by the plurality of urging portions.

In the present invention, a plurality of the elastic deformation portions are provided along the rotation direction of the blade driving member.
According to this aspect of the present invention, the rotation operation of the blade driving member can be further stabilized by the plurality of elastic deformation portions.

Note that the present invention can be widely applied to an imaging device such as a camera provided with the blade driving device described above.
According to this aspect of the present invention, stable blade driving can be realized, so that the photographing quality can be improved.

  According to the present invention, it is possible to realize a blade driving device and an imaging device that can realize relatively stable blade driving.

The disassembled perspective view which shows schematic structure of the blade | wing drive device which concerns on Embodiment 1 of this invention. FIG. 2 is a schematic perspective view illustrating a base plate of the blade driving device according to the first embodiment. FIG. 2 is a schematic perspective view illustrating a blade of the blade driving device according to the first embodiment. FIG. 3 is a schematic perspective view illustrating a drive ring of the blade driving device according to the first embodiment. FIG. 3 is a schematic perspective view illustrating a pressing plate of the blade driving device according to the first embodiment. The principal part expansion perspective view of FIG. The principal part enlarged view of the contact part of the drive ring and pressing plate of the blade | wing drive device of Embodiment 1. FIG.

Hereinafter, embodiments of the present invention will be described in detail.
The blade drive device of the present invention has a structure in which a blade drive member for allowing a blade to enter and exit from an opening through which light passes is urged against a power transmission member for transmitting rotational power to the blade drive member. By doing so, the gap between the blade driving member and the power transmission member is substantially filled to realize stable driving of the blade driving member.

  More specifically, the blade driving device of the present invention rotates around the opening in an engaged state with the opening forming member that forms the opening through which light passes, the blade that enters and exits the opening, and the blade. A moving blade driving member; and a driving means for rotating the blade driving member. The drive means for rotating the blade drive member is a power transmission member that transmits power for rotating the blade drive member by contacting the end of the blade drive member from a direction substantially orthogonal to the optical axis direction. Have The blade driving member receives power from the power transmission member while being biased toward the power transmission member between the opening forming member and the power transmission member, and rotates around the opening.

  According to the present invention having such a configuration, in the course of the rotation operation of the blade driving member, the blade driving member is urged by the power transmission member and substantially fills the gap between them, so that the connection of the power transmission portion is achieved. By increasing the reliability, stable operation of the blade driving member, that is, stable blade driving can be realized.

  Here, as the blade driving member, for example, a disk-shaped drive provided in an annular shape so as to surround the periphery of the opening in consideration of thinning of the blade driving device in the optical axis direction, high-speed operation of the blade, etc. A ring should be used.

  In this case, for example, if a gear portion is provided at the end of the drive ring and a pinion gear is connected to the gear portion as a power transmission member, the drive ring is rotated to the extent that the drive ring can rotate. It is better to bias to the side.

  As a result, the gap between the gear portion of the drive ring and the pinion gear can be filled to effectively prevent backlash and radial backlash (radial backlash). Therefore, stable driving of the drive ring can be realized while preventing noise during driving due to play in the power transmission portion.

  As a structure for biasing the blade driving member toward the power transmission member, for example, a biasing portion may be provided so as to bias the blade driving member from the opening forming member side that supports the blade driving member. The elastic deformation portion provided at the end of the blade driving member may be biased to the opening forming member, and another biasing member may be provided between the blade driving member and the opening forming member. Also good. In any case, by interposing between the opening forming member and the blade driving member and substantially filling the gap between them, stable blade driving can be realized with a simple configuration.

  Such a configuration in which the blade driving member is urged toward the power transmission member is provided in a plurality along the rotation direction of the blade driving member, so that the rotation operation of the blade driving member can be further stabilized.

  Further, each biasing direction when the blade driving member is biased at a plurality of locations is preferably a direction in which the blade driving member acts on the power transmission member. For example, when the blade driving member is an annular drive ring, The blade drive member may be urged toward the power transmission member at the end opposite to the radial direction from the portion connected to the transmission member and in the vicinity thereof.

  The blade drive member is not limited to the annular member such as the drive ring described above, and may be a fan-shaped arc member that turns (rotates) around the opening through which light passes. Even in this case, for example, it is possible to employ a structure in which a gear portion or the like is provided on the outer peripheral portion of the arc-shaped member, and the blade is engaged with the blade inside to hold the blade so as to be able to enter and leave the opening. .

Hereinafter, embodiments of the present invention will be described with specific examples with reference to the drawings.
<Embodiment 1>
FIG. 1 is an exploded view of an iris-type diaphragm device serving as a light amount adjusting device according to the first embodiment of the present invention. 2 is an enlarged perspective view of the main part of the base plate of the diaphragm device, FIG. 3 is an enlarged perspective view of the diaphragm blade, FIG. 4 is an enlarged perspective view of the drive ring, and FIGS. Fig. 2 shows an enlarged perspective view of the pressing plate. Further, FIG. 7 shows an enlarged view of a main part in a state where the drive ring and the pressing plate are assembled. Although the diaphragm device will be described here, a shutter device and a diaphragm device having a shutter function are also included in the light amount adjusting device as an embodiment of the present invention.

  As illustrated, the diaphragm device 10 of the present embodiment includes, for example, a base plate (base member) 20, a plurality of diaphragm blades (light-shielding blades) 30, a drive ring 40, a pressing plate (pressing member) 50, and a pinion. A gear 60, an actuator 70, a photo interrupter 80, and an elastic body 90 are included.

  Here, the ground plane 20 has a fixed opening 21 provided penetrating in the optical axis direction. Further, a plurality of diaphragm blades 30 are arranged on the outer periphery of the fixed opening 21 on the base plate 20, a drive ring 40 that is a blade drive member is arranged thereon, and a pressing plate 50 is further provided on the base plate 20. Is mounted against.

  Thus, a drive space in which the drive ring 40 and the diaphragm blade 30 are driven is formed between the base plate 20 and the pressing plate 50, and the diaphragm blade 30 is formed in the fixed opening 21 between the base plate 20 and the drive ring 40. A traveling space for traveling is formed.

  The actuator 70 mounted on the holding plate 50 is an electromagnetic actuator such as a stepping motor. A pinion gear 60 that rotationally drives the drive ring 40 is attached to the output shaft of the actuator 70. The actuator 70 and the pinion gear 60 constitute a drive source unit.

  The photo interrupter 80 is used as a sensor for detecting the initial position of the drive ring 40, and the photo interrupter 80 is press-fitted and fixed to the holding plate 50.

  In the diaphragm device 10, the central axis A as shown in FIG. 1 is in the optical axis direction, and when the diaphragm device 10 is mounted on the imaging device, the central axis A also coincides with the optical axis of the imaging device. In the following description, a direction parallel to the central axis A is referred to as a thrust direction. The holding plate 50, the drive ring 40, the plurality of diaphragm blades 30, and the main plate 20 are stacked in this order in the thrust direction.

  That is, the drive ring 40 is disposed on the side opposite to the base plate 10 with respect to the diaphragm blade 30 in the thrust direction, and the holding plate 50 is disposed on the side opposite to the base plate 20 with respect to the diaphragm blade 30 and the drive ring 40. The In addition, a direction and a surface orthogonal to the thrust direction are referred to as a radial direction (radial direction) and a radial surface, respectively.

  A plurality of aperture blades 30 are arranged in the circumferential direction of the fixed opening 21 formed in the main plate 20. In this embodiment, nine diaphragm blades 30 are used. The number of diaphragm blades is not limited to nine, and can be set arbitrarily.

  The ground plane 20 shown in FIG. 2 is formed in a ring shape having a fixed opening 21 serving as a light passage opening at the center thereof, and cam pins 32 of a plurality of diaphragm blades 30 are respectively associated with the periphery of the ring shape. A plurality of cam grooves 22 (the same number as the diaphragm blades 30) are formed. In addition, a plurality of semicircular protrusions 23 for supporting the drive ring 30 are provided. In addition, a plurality of claw shapes 24 for fixing the pressing plate 50 are provided.

  Further, FIG. 3 shows one aperture blade 30 in an enlarged manner. This diaphragm blade 30 is arranged so as to be substantially parallel to the radial surface, and has a flat blade portion having a light shielding function, and a drive pin 31 provided so as to protrude from the blade portion to opposite sides in the thrust direction. And a cam pin 32. The positions of the drive pin 31 and the cam pin 32 in the radial plane are different from each other.

  FIG. 4 shows the drive ring 40 in an enlarged manner. The drive ring 40 has a light passage opening 41 at the center thereof, and a plurality of protrusions 51 of the pressing plate 50 shown in FIG. 5 and a cylindrical protrusion 42 that determines radial play along the circumferential direction of the light passage opening 41. Thus, the drive ring 40 is supported so as to be rotatable around the central axis A. 3 has the same number of round hole shapes 43 fitted to the drive pins 31 of the diaphragm blades 30 shown in FIG.

  Further, a gear portion 44 that meshes with the pinion gear 60 is formed on a part of the outer peripheral portion of the drive ring 40. Further, the drive ring 40 has a plurality of semicircular protrusions 45 on the surface of the drive ring 40 for contacting and supporting the back surface of the pressing plate.

  Further, at one place in the circumferential direction of the drive ring 40, a light shielding protrusion 46 that enters between the light emitting portion and the light receiving portion of the photo interrupter 80 and shields light is provided.

  FIG. 5 shows an enlarged view of the pressing plate 50. The holding plate 50 has a plurality of protrusions 51 that are fixed by the claw portions 34 of the base plate 20 and fit with the cylindrical protrusions 42 of the drive ring 40. Moreover, it has the groove | channel 52 for pinching and fixing an elastic body on the back surface.

  FIG. 6 shows an enlarged view of the pressing plate 50 and the elastic body 90. The elastic body 90 is attached to the groove portion 52 of the pressing plate 50 as an urging means (urging member) for urging the drive ring 40.

  FIG. 7 shows an enlarged view of the drive ring 40, the pressing plate 50, and the elastic body 90. The elastic body 90 attached to the opening of the pressing plate 50 is arranged to face the pinion gear, and has a structure for pressing the drive ring 40.

<Other embodiments>
As mentioned above, although this invention was demonstrated in detail based on Embodiment 1, this invention is not limited to Embodiment 1 mentioned above.
In the embodiment described above, the elastic body 90 is attached to the holding plate 50 and the drive ring 40 is urged to fill the gap. However, the present invention is of course not limited to this. For example, the elastic body is used as the drive ring. It is also possible to attach, or an elastic body can be attached to the main plate.

20 Base plate 30 Diaphragm blade 40 Drive ring 50 Holding plate 60 Pinion gear 70 Actuator 80 Photo interrupter 90 Elastic body

Claims (6)

An opening forming member that forms an opening through which light passes;
A blade entering and exiting the opening;
A blade driving member that rotates around the opening in a state of being engaged with the blade;
Driving means for rotating the blade driving member,
The driving means has a power transmission member that transmits power for rotating the blade driving member by contacting the end of the blade driving member from a direction substantially orthogonal to the optical axis direction;
The blade driving member receives power from the power transmission member while being biased toward the power transmission member between the opening forming member and the power transmission member, and rotates around the opening. A blade drive device characterized by that.   The blade driving member is biased toward the power transmission member by a biasing portion provided in the opening forming member, and is held between the biasing portion and the power transmission member, and the opening portion The blade driving device according to claim 1, wherein the blade driving device rotates around the periphery of the blade.   The blade drive member is provided at an end of the blade drive member opposite to the portion with which the power transmission member abuts, and the power transmission is performed by an elastic deformation portion that abuts against the opening forming member and elastically deforms. 2. The blade driving device according to claim 1, wherein the blade driving device rotates around the opening while being biased toward the member and being gripped between the opening forming member and the power transmission member.   The blade driving device according to claim 2, wherein a plurality of the urging portions are provided along a rotation direction of the blade driving member.   The blade driving device according to claim 3, wherein a plurality of the elastic deformation portions are provided along a rotation direction of the blade driving member.   An imaging apparatus comprising the blade driving device according to claim 1.

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