JP2008164726A - Blade drive device for camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blade drive device for a camera improved in assembly workability. <P>SOLUTION: The drive device 1 for the camera includes: a substrate 10 having an aperture 15; blades 20a-20c openably supporting the aperture 15; and a drive ring 30 for transmitting drive force supplied from a drive source to the blades by being rotatably supported relative to the substrate 10. The drive device includes: a main support part 13 for supporting the drive ring 30 by being slid on a part of the drive ring 30; projections 31a-31c for suppressing the drive ring 30 from being inclined by being separated from the main support part 13 during assembling working, and auxiliary support parts 11a-11c. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a camera blade driving device.

  2. Description of the Related Art Conventionally, a camera blade driving device that drives a blade using a drive ring is known. For example, in Patent Document 1, a driving ring is rotatably arranged on a substrate having an opening, and a blade for opening and closing the opening is engaged with the driving ring, so that the blade is rotated according to the rotation of the driving ring. A blade driving device for a camera that opens and closes is disclosed. Many such camera blade drive devices are manually assembled by an operator.

JP-A-5-340711

In such a camera blade drive device, the drive ring needs to be rotatably supported with respect to the substrate. Therefore, the substrate is formed in a cylindrical shape, and a support portion that is in sliding contact with a part of the drive ring is formed. Has been. For this reason, in order to assemble such a blade driving device for a camera, it is necessary to place a driving ring on the support portion and to arrange each component such as a blade on the driving ring.
However, the support portion is formed to have a width that is thinner in the radial direction than the drive ring, and is in sliding contact with only an inner portion of the radial width of the drive ring. Therefore, when the blade is assembled to the blade operation pin of the drive ring, if the blade or the blade operation pin to be assembled is pushed, the drive ring is inclined with respect to the substrate, and is disposed above the drive ring. In some cases, the engaged parts are disengaged. For this reason, assembly workability has deteriorated.
In addition, the drive ring can be stably supported by increasing the contact area between the support portion and the drive ring, but there is a problem that the sliding resistance increases.

  Accordingly, an object of the present invention is to provide a camera blade driving device with improved assembly workability.

The object is to provide a substrate having an opening, a blade that supports the opening so as to be opened and closed, and a drive ring that is rotatably supported with respect to the substrate and transmits a driving force supplied from a driving source to the blade. A main support portion that slides into contact with a part of the drive ring and supports the drive ring, and a tilt suppression that suppresses tilting of the drive ring due to disengagement of support from the main support portion during assembly work And a means for driving a camera blade.
With this configuration, it is possible to suppress tilting of the drive ring due to disengagement of support from the main support portion, so that assembly workability is improved.

Further, in the above configuration, the main support portion supports an inner portion of the radial width of the drive ring, and the tilt suppressing means includes a protruding portion protruding radially outward from the drive ring, A configuration including an auxiliary support portion that supports the protruding portion can be employed.
With this configuration, the radially inner portion and the outer side of the drive ring can be supported, so that the occurrence of the tilt of the drive ring during assembly work can be suppressed. In addition, since the auxiliary support portion supports the drive ring from the outside in the radial direction, even when the region where the main support portion and the drive ring are in sliding contact with each other is reduced, the occurrence of the inclination of the drive ring can be suppressed. For this reason, the sliding resistance between the drive ring and the main support portion can be reduced by reducing the sliding contact area between the main support portion and the drive ring.

  According to the present invention, it is possible to provide a camera blade driving device with improved assembly workability.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 is a front view showing a partial configuration of a camera blade driving device according to an embodiment of the present invention, FIG. 2 is a perspective view showing a partial configuration of a camera blade driving device, and FIG. It is sectional drawing of the AA line direction of 1. FIG.

The camera blade drive device includes a substrate 10, blades 20a to 20c, a drive ring 30, a gear group 40, and the like.
The substrate 10 is formed by injection molding a resin, and has a photographing opening 15 at the center thereof. A convex surface 14 that protrudes toward the subject side in a cylindrical shape with the opening 15 as the center is formed on the substrate 10. A degree determining pin 16 that engages with a degree determining hole 21a formed in the blade 20a and defines an operating angle of the blade 20a is formed on the convex surface 14. The blade 20a has such a configuration because the gear group 40 is provided in the drive region, and the determination pin is not provided at the drive region end of the blade 20a.
The blades 20b and 20c are also provided with holes 21b and 21c in the same manner as the blade 20a, but there is no pin to be engaged therewith. This is because a common blade is used.

  A main support portion 13 for supporting the drive ring 30 is formed on the radially outer side of the convex surface 14. As shown in FIG. 3, the main support portion 13 is formed at a position lower than the convex surface 14 via the stepped portion. The main support portion 13 is a portion indicated by hatching in FIG. Most of the main support portion 13 is slidably in contact with an inner portion of the radial width of the drive ring 30.

  Bottom portions 12 a to 12 c and shaft portions 17 a to 17 c are formed on the radially outer side of the main support portion 13. Auxiliary support portions 11a to 11c are formed on the bottom surface portions 12a to 12c. The auxiliary support portions 11a to 11c are slidably in contact with the protruding portions 31a to 31c formed on the drive ring 30, respectively. The auxiliary support portions 11a to 11c and the protruding portions 31a to 31c have a function as an inclination suppressing unit. The shaft portions 17a to 17c rotatably support the blades 20a to 20c, respectively.

The gear group 40 transmits drive from an actuator (not shown) as a drive source disposed on the imaging element side of the substrate 10 to the drive ring 30. Specifically, the gear 41 assembled to the rotating shaft of the actuator meshes with the adjacent gear 42a, and the gear 42b formed coaxially with the gear 42a meshes with the adjacent gear 43a, and formed coaxially with the gear 43a. The gear 43 b meshes with a tooth portion 33 formed on a part of the outer periphery of the drive ring 30. As a result, the drive of the actuator is transmitted to the drive ring 30.
The gear 43a is formed with a through hole 43c for position detection.

  The blades 20a to 20c are formed in the same shape. The blade 20a is formed with a degree determining hole 21a and engages with the degree determining pin 16. Further, the blades 20a to 20c are respectively formed with long holes 22a to 22c, and engage with drive pins 32a to 32c formed on the drive ring 30, respectively.

  The drive ring 30 is formed of resin, and the radial width of the drive ring 30 is basically larger than the radial width of the main support portion 13. Further, as described above, the drive ring 30 is integrally formed with the protruding portions 31a to 31c protruding outward in the radial direction. Drive pins 32a to 32c that protrude toward the subject side in the optical axis direction are integrally formed with the protrusions 31a to 31c, respectively. Further, the surfaces on the image sensor side of the protrusions 31a to 31c are slidably in contact with the auxiliary support portions 11a to 11c, respectively.

  The drive ring 30 to which the drive is transmitted from the actuator rotates in a predetermined range, and accordingly, the drive pins 32a to 32c rotate, and the blades 20a to 20c perform an opening / closing operation. In FIG. 1, when the drive ring 30 rotates counterclockwise, the blades 20 a to 20 c have the shaft portions 17 a to 17 c as fulcrums, and the tips of the blades 20 a to 20 c on the opening 15 side face toward the center of the opening 15. Swing.

Next, the auxiliary support portions 11a to 11c and the protruding portions 31a to 31c will be described in detail.
The auxiliary support portions 11 a to 11 c support the protruding portions 31 a to 31 c, and the main support portion 13 supports the radially inner portion of the drive ring 30. Thereby, the auxiliary support portions 11a to 11c and the main support portion 13 can stably support the drive ring 30. Therefore, even if the blades or the protrusions are pushed during the assembling work, the drive ring 30 can be prevented from being tilted with respect to the substrate 10, so that the assembling workability is improved.

  In addition, since the auxiliary support portions 11a to 11c support the drive ring 30 from the outside in the radial direction, even if the area where the main support portion 13 and the drive ring 30 are in sliding contact with each other is made small, the tilt of the drive ring is generated. Can be suppressed. For this reason, the sliding resistance between the drive ring 30 and the main support portion 13 can be reduced by reducing the sliding contact area between the main support portion 13 and the drive ring 30.

  Further, as shown in FIGS. 2 and 3, the auxiliary support portions 11a to 11c are formed to protrude from the bottom surface portions 12a to 12c in a rib shape toward the subject side in the optical axis direction. Thereby, the strength of the bottom surface portions 12a to 12c is increased, and there is an effect of suppressing the deformation of the substrate 10 due to an external force such as twisting or bending.

The auxiliary support portions 11a to 11c are equally provided in the circumferential direction around the optical axis. With this configuration, the drive ring can be supported with a good balance around the optical axis.
Further, as shown in FIGS. 1 and 2, stoppers 34 and 35 for restricting the rotation range of the drive ring 30 by being in contact with the protruding portion 31a are integrally formed on the auxiliary support portion 11a.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and modifications and changes can be made within the scope of the gist of the present invention described in the claims. Is possible.

It is the front view which showed the structure of a part of camera blade | wing drive device which concerns on one Embodiment of this invention. It is the perspective view which showed a part of structure of the blade drive device for cameras. It is sectional drawing of the AA line direction of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Substrate 11a-11c Auxiliary support part 12a-12c Bottom face part 13 Main support part 14 Convex surface 15 Opening 16 degree | times Determining pin 17a-17c Shaft part 20a-20c Blade | wing 21a-21c Degree decision hole 22a-22c Long hole 30 Drive ring 31a- 31c Protrusion part 32a-32c Drive pin 33 Tooth part 34, 35 Stopper 40 Gear group

Claims (2)

A substrate having an opening; a blade that is supported to be able to open and close the opening; and a drive ring that is rotatably supported with respect to the substrate and transmits a driving force supplied from a driving source to the blade.
A main support portion that slidably contacts a part of the drive ring and supports the drive ring;
A camera blade drive device comprising: an inclination suppression means for suppressing the drive ring from being tilted by disengaging support from the main support portion during assembly work. The main support portion supports an inner portion of the radial width of the drive ring,
2. The camera blade driving device according to claim 1, wherein the tilt suppression unit includes a protruding portion that protrudes radially outward from the drive ring, and an auxiliary support portion that supports the protruding portion.

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