JPH1096973A - Driving device for camera shutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of the parts of a shutter driving device and further, the thickness of a device. SOLUTION: An intermediate gear 3 engaged with a rotor pinion is pivotally supported to be freely rotatable by a supporting shaft 7a provided projectingly on a motor base plate. In a sector ring 4 for rocking plural sectors, a step part 4b concentric with a lens aperture is formed and a collar part having width capable of receiving one end part of the intermediate gear is provided outside the step part 4b. In the partial range of the outer peripheral part of the step part, a tooth part 4a capable of engaging with the pinion part 3b of the intennediate gear is provided by notching. The intermediate gear 3 is supported in a state where a movement in an axial direction is regulated, in such a manner that the movement in the axial direction of one side part of the gear 3 is regulated by the base part of the supporting shaft 7a and the other side part is held by the collar part of the sector ring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera shutter driving device.

[0002]

2. Description of the Related Art It is well known that there are various types of driving mechanisms for opening and closing a shutter of a camera, that is, so-called camera shutter driving devices.
Among such camera driving devices, there is one that employs a mechanism that swings three sectors by turning a rotatable sector ring concentric with a lens opening (for example, Japanese Patent Application Laid-Open No. 6-543210). ).

In the above mechanism, power is transmitted from the shutter drive motor to the sector ring via an intermediate wheel meshing with a rotor pinion integral with the motor shaft, and the pinion of the intermediate wheel is engraved in a partial range on the outer periphery of the sector ring. This is performed by engaging with the provided teeth. When the sector ring is reciprocated by the motor drive, the three sectors swing and open / close the shutter opening with a predetermined aperture.

[0004] The intermediate wheel described above is a stepped gear having a pinion portion integral with a gear portion, and is rotatably supported by a support shaft protruding from a motor substrate. The movement in the axial direction is restricted by a step formed at the base of the support shaft, and the other side is supported by one side surface of a middle plate provided between the motor board and the shutter board, thereby allowing the shaft to move in the axial direction. Restricts movement.

[0005]

As described above, since the mechanism for opening and closing the shutter by rotating the motor is employed, the existence of the intermediate wheel is indispensable.
The installation of a middle plate to support this is inevitable. However, there is a problem in that the installation of the middle plate increases the thickness of the shutter mechanism and increases the number of parts.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an intermediate wheel rotatably fitted on a shaft protruding from one of a motor substrate and a shutter substrate to form a sector ring. In order to restrict the movement of the intermediate wheel in the axial direction, the intermediate wheel has a width capable of receiving at least one end of the intermediate wheel. Therefore, since one end of the intermediate wheel fitted to the support shaft protruding from the motor substrate or the shutter substrate is received by one side of the sector ring, it is not necessary to install the intermediate plate employed in the prior art. The device has been made thinner.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A camera shutter driving device according to the present invention is capable of transmitting a rotation of a rotor mounted on a motor substrate to a sector ring provided concentrically with respect to a shutter opening. The intermediate car provided in,
A plurality of sectors are attached to a shutter substrate provided so as to face the sector ring, and are attached so as to swing by rotation of the sector ring.

The intermediate wheel described above is rotatably fitted to a support shaft protruding from one of the motor substrate and the shutter substrate, and meshes with a tooth of a sector ring to rotate the rotor. It can be transmitted to the ring. The sectoring has a width capable of receiving at least one end of the intermediate wheel, and is configured to receive one end of the intermediate wheel so that the axial movement of the intermediate wheel can be restricted.

[0009]

FIG. 2 shows the state of the upper surface of a shutter substrate. A motor substrate, which will be described later, is provided above the shutter substrate so that a drive motor is mounted on the motor substrate. As shown in FIG. 2, a rotor pinion 2 is fixed to a rotor shaft 1 of a shutter driving motor (not shown). The rotor pinion 2 is a gear portion 3a of the intermediate wheel 3.
The pinion portion 3b of the intermediate wheel meshes with the tooth portion 4a of the sector ring 4. The sector ring 4 is located on the front surface of the shutter substrate 5 formed in a disk shape, and its outer periphery is formed in a circular shape concentric with the shutter opening OA.

The upper surface of the sector ring 4 is provided with a step 4b, and the outside of the step is a flat brim having a width for receiving one end of the intermediate wheel 3. The above-described tooth portion 4a is engraved on a part of the outer peripheral portion of the step. A sector room S for installing a sector is provided between the sector ring 4 and the shutter substrate 5 (see FIG. 1). In this sector room S, three sectors 6 are swingably mounted. The base of each sector 6 is swingably supported by sector support pins 5a projecting from the shutter substrate 5. As means for securing the sector room S,
At a predetermined position on the shutter substrate 5, a height receiver 5b for keeping the height of the sector ring 4 constant is protruded (see FIG. 1).

FIG. 1 is an enlarged view of a main part of the present invention, in which a tooth 4a formed on the upper surface of a sector ring 4 and a pinion 3b of an intermediate wheel 3 are meshed. The intermediate wheel 3 is rotatably fitted to a support shaft 7a protruding from a lower surface of a motor board (not shown). One side (the upper side in FIG. 1) of the intermediate wheel 3 is restricted from moving in the axial direction by the base of the support shaft 7a, and the other side (the lower side in FIG. 1) is outside the teeth 4a of the sector ring 4. On the other hand, movement in the axial direction is restricted by being received by the flange portion formed with a predetermined width. The inner peripheral portion of the sector ring 4 is prevented from floating by the holding portion 7b integrated with the motor substrate.

On the lower surface of the sector ring 4, drive pins 4c for swinging the sector 6 are provided at three positions at equal angular intervals. Each drive pin 4c is engaged with a long groove 6a provided in each sector (see FIG. 2).
The rotation of the drive pin 4c makes it possible to swing each sector about the support shaft 5a while moving in the long groove.
Notches 4c... For ensuring relative movement of the support shaft 5a during rotation are provided on the outer peripheral portion of the sector ring 4. As described above, in the present invention, the movement of the intermediate wheel in the axial direction is not restricted by the motor substrate and the intermediate plate as in the prior art. Thus, a reduction in the number of parts and a reduction in the thickness of the device can be realized.

In this embodiment, the intermediate wheel is fitted on a shaft protruding from the motor board, but it may be fitted on a shaft protruding from the shutter board. Although not shown in the drawings, the positioning of the rotor pinion 2 can be received by one side of the sector ring 4 as in the case of the intermediate wheel. However, in order to stabilize the motor, It is also effective to extend the rotor shaft 2 to be supported on the upper surface of the shutter substrate 5.

[0014]

According to the present invention, the intermediate wheel is positioned by the shaft projecting from the motor substrate or the shutter substrate and the sector ring without providing the intermediate plate, so that the number of parts can be reduced. In addition, it is possible to reduce the thickness of the shutter driving device.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of the present invention.

FIG. 2 is a plan view showing a configuration of the present invention by removing a motor substrate.

[Explanation of symbols]

 OA shutter opening 3 intermediate wheel 4 sectoring 5 shutter board 6 sector 7a support shaft

Claims (1)

[Claims] A sector ring provided rotatably concentrically with respect to a shutter opening; an intermediate wheel provided so as to transmit rotation of a rotor mounted on a motor substrate to the sector ring; And a plurality of sectors attached to a shutter substrate provided so as to be opposed to and swingably by the rotational movement of the sector ring. The sector ring is rotatably fitted on a support shaft protruding from one of the motor substrate and the shutter substrate, and the sector ring is provided at least on the intermediate wheel in order to regulate the axial movement of the intermediate wheel. A camera shutter driving device having a width capable of receiving one end.