JP3612389B2 - Camera shutter drive device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a camera shutter driving device.
[0002]
[Prior art]
As is well known, there are various driving mechanisms for opening and closing the camera shutter, so-called camera shutter driving devices. Among such camera driving devices, there is one that employs a mechanism that swings three sectors by rotation of a rotatable sectoring concentric with the lens opening (for example, Japanese Patent Laid-Open No. 6-543210). ).
[0003]
In the above mechanism, the transmission of power from the shutter drive motor to the sectoring is carried out through an intermediate wheel meshing with a rotor pinion integrated with the motor shaft, and the pinion of the intermediate wheel is engraved in a partial range on the outer periphery of the sectoring. This is done by meshing with a certain tooth portion. When the sector ring is reciprocally rotated by driving the motor, the three sectors swing to open and close the shutter opening with a predetermined aperture.
[0004]
By the way, the intermediate wheel described above is a stepped car having a pinion portion integrated with the gear portion, and is rotatably supported by a support shaft protruding from the motor board, and one side portion of the support shaft is provided. Movement in the axial direction is regulated by the stepped portion formed in the base, and movement in the axial direction is regulated by supporting the other side part by one side surface provided between the motor substrate and the shutter substrate. doing.
[0005]
[Problems to be solved by the invention]
As described above, as long as a mechanism that opens and closes the shutter by rotating the motor is employed, the presence of the intermediate wheel is indispensable, and the installation of the intermediate plate for supporting this is inevitable. However, the installation of the intermediate plate has a problem that the thickness of the shutter mechanism is increased and the number of parts is increased.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problem, the present invention is configured such that an intermediate wheel is rotatably fitted to a shaft protruding from one of a motor board and a shutter board, and a sector ring is attached to a pinion portion provided in the intermediate car. It has a step formed on the outer peripheral portion of the meshing tooth portion and a flat collar portion that receives one side portion of the intermediate wheel outside the tooth portion, and attaches a plurality of sectors between the sectoring and the shutter substrate. It is like that. Therefore, one side portion of the intermediate wheel fitted to a support shaft projecting from the motor substrate or the shutter plate is not required the installation of an intermediate plate which had been adopted in the prior art for is Me latch receiving the collar portion of the sectoring The device has been made thinner. Further, the shutter substrate is provided with a height receiver that keeps the height of the sectoring from the shutter substrate constant.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The camera shutter driving device according to the present invention is provided so that the sectoring provided to be concentrically rotatable with respect to the shutter opening and the rotation of the rotor shaft of the motor mounted on the motor board are transmitted to the sectoring and intermediate wheel, between the shutter board is provided so as to face the sectoring and sectoring, and a plurality of sectors is mounted so as to swing by the rotation movement of the sectoring.
[0008]
The intermediate wheel described above is rotatably fitted to a support shaft that protrudes from either the motor board or the shutter board, and meshes with the teeth of the sectoring to transmit the rotation of the rotor to the sectoring. It is possible. The sectoring has a step formed on the outer peripheral portion of a tooth portion that meshes with a pinion portion provided in the intermediate wheel, and a flat collar portion that receives one side portion of the intermediate wheel outside the tooth portion. . Further, the shutter substrate is provided with a height receiver that keeps the height of the sectoring from the shutter substrate constant.
[0009]
【Example】
FIG. 2 shows the state of the upper surface of the shutter substrate. A motor substrate described later is provided above the shutter substrate, and a drive motor is attached to the motor substrate.
As shown in FIG. 2, a rotor pinion 2 is fixed to a rotor shaft 1 of a motor (not shown) for driving a shutter. The rotor pinion 2 meshes with the gear portion 3 a of the intermediate wheel 3, and the pinion portion 3 b of the intermediate wheel meshes with the tooth portion 4 a of the sector ring 4. The sector ring 4 is positioned on the front surface of the shutter substrate 5 formed in a disc shape, and the outer periphery thereof is formed in a circular shape concentric with the shutter opening OA.
[0010]
A step 4 b is provided on the upper surface of the sector ring 4, and the outside of the step is a flat collar having a width for receiving one end of the intermediate wheel 3. The tooth portion 4a described above is engraved on a part of the outer periphery of the step.
A sector chamber S for installing a sector is provided between the sector ring 4 and the shutter substrate 5 (see FIG. 1). In this sector chamber S, three sectors 6... Are swingably attached. The base of each sector 6 is supported by a sector support pin 5a. As a means for securing the sector chamber S, a height receiver 5b that keeps the height of the sector ring 4 constant is projected at a predetermined position on the shutter substrate 5 (see FIG. 1).
[0011]
FIG. 1 is an enlarged view of a main portion of the present invention, in which a tooth portion 4a formed on the upper surface of the sector ring 4 and a pinion portion 3b of the intermediate wheel 3 are engaged with each other. The intermediate wheel 3 is rotatably fitted to a support shaft 7a projecting from the lower surface of a motor board (not shown). One side of the intermediate wheel 3 (upper side in FIG. 1) is restricted from moving in the axial direction by the base of the support shaft 7a, and the other side (lower side in FIG. 1) is outside the teeth 4a of the sector ring 4. The movement in the axial direction is restricted by being received by a flange portion having a predetermined width. Note that the inner peripheral portion of the sector ring 4 is prevented from floating by a holding portion 7b integrated with the motor substrate.
[0012]
On the lower surface of the sector ring 4, drive pins 4c for swinging the sector 6 are projected at three positions at equal angular intervals. Each drive pin 4c is engaged with a long groove portion 6a provided in each sector (see FIG. 2), and the drive pin 4c moves in the long groove portion by rotation of the sector ring 4, and each of the drive pins 4c is centered on the support shaft 5a. The sector can be swung. The outer periphery of the sector ring 4 is provided with notches 4c for ensuring relative movement of the support shaft 5a during rotation.
As described above, in the present invention, the movement restriction in the axial direction of the intermediate wheel is not performed by the motor board and the middle plate as in the prior art, and the motor board and the sectoring are omitted without installing the middle board. This reduces the number of parts and makes the device thinner.
[0013]
In this embodiment, the intermediate wheel is fitted to the shaft protruding from the motor board, but this may be fitted to the shaft protruding from the shutter board.
Although not shown in the drawing, the positioning of the rotor pinion 2 can be received at one side of the sector ring 4 as in the intermediate car, but for the stabilization of the motor, It is also effective to extend the rotor shaft 2 so as to be supported on the upper surface of the shutter substrate 5.
[0014]
【The invention's effect】
According to the present invention, since the intermediate wheel is positioned by the shaft protruding from the motor board or the shutter board and the sectoring without providing the intermediate plate, the number of parts can be reduced and the shutter drive device Can be made thinner.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view of a main part of the present invention.
FIG. 2 is a plan view showing the configuration of the present invention with the motor substrate removed.
[Explanation of symbols]
OA Shutter opening 3 Intermediate wheel 4 Sector ring 5 Shutter substrate 6 Sector 7a Support shaft

Claims (2)

A sector ring is provided rotatably concentrically to the shutter opening, the intermediate wheel the rotation of the rotor shaft of the motor is provided so as to be transmitted to the sector ring attached to the motor substrate, the sectoring and the between the shutter board is provided so as to face the sectoring is a drive device for a camera shutter that includes a plurality of sectors is mounted so as to swing by the rotation movement of the sectoring,
The intermediate wheel is rotatably fitted to a support shaft that protrudes from either the motor board or the shutter board,
The sectoring includes a step formed on the outer peripheral portion of a tooth portion that meshes with a pinion portion provided on the intermediate wheel, and a flat collar portion that receives one side portion of the intermediate wheel outside the tooth portion. A shutter driving device for a camera, comprising: 2. The camera shutter driving device according to claim 1, wherein the shutter substrate is provided with a height receiver for maintaining a constant height of the sectoring from the shutter substrate .

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