JPH0248931U - - Google Patents

Description

[Brief explanation of drawings]

Figure 1 is a plan view showing one embodiment of the present invention, Figure 2 is a plan view showing one embodiment of the present invention;
The figure is a perspective view showing the relationship between the ratchet lever, the movable iron piece, and the iron piece lever. Figure 3 is an enlarged plan view of the ratchet wheel and the ratchet lever. Figure 4 is a block diagram of an example of the control system of the present invention. Figure 5. is a time chart showing the pulse at initial startup. DESCRIPTION OF SYMBOLS 1... Main drive ring, 1b... Engaging piece, 2... Step motor, 4... Cam ring, 4e... Engaging pin, 8
... Ratchet wheel, 8a... Shelf, 8b... Ratchet gear, 9... Ratchet lever, 12... Movable iron piece, 13... Iron piece lever, 15... Cam interlocking lever, 17... Vane drive cam, 20... Magnet, 21
...Iron core, 22...Restriction lever, 22a...First arm, 22b...Second arm, 25...Cam, P2...Engagement point.

Claims (1)

[Claims for Utility Model Registration] (1) A step motor that can rotate in both forward and reverse directions, and a main drive member that is connected to the step motor and opens and closes the shutter blade in the latter region of forward movement;
It is always biased in the forward direction, is engaged with an engaging portion disposed on the main drive member, and is restricted from rotating in the forward direction, and is within the operating range before the main drive member drives the shutter blade. A lens driving member having a limited effective operating area and driving a lens within the effective operating area, and a ratchet gear that is provided in association with the lens driving member and has a row of ratchet pawls that restrict forward movement of the lens driving member. and a ratchet lever that is biased toward the travel line of the ratchet pawls arranged in the row and engages any one of the ratchet pawls arranged in the row; In the lens drive mechanism with a shutter drive mechanism, the ratchet lever is continuously held in the direction of the origin of a portion of the ratchet gear where the ratchet claws are arranged in rows. A cam portion is formed that retracts the ratchet from the running motion line of the ratchet pawl, and the ratchet lever is applied to a portion where the ratchet gear moves in the forward direction from the origin position of the cam portion and before reaching the first ratchet pawl. a first arm that forms an engagement point that is engaged with the lens drive member, and that is engaged with the lens drive member to restrict the main drive member from moving forward relative to the lens drive member; A regulating lever having an integrally formed second arm is pivotably attached to the main drive member, and contacts the second arm of the regulating lever to drive the first arm of the regulating lever and the lens drive member. The cam portion that releases the engagement with the member is set at a point on the passage path of the second arm in the forward direction and before the first ratchet pawl formed on the ratchet gear reaches the position of the ratchet lever. A malfunction prevention device for a lens drive mechanism with a shutter drive mechanism, characterized in that the device is formed at a location where an arm reaches. (2) Utility Model Registration In the malfunction prevention device for a lens drive mechanism with a shutter drive mechanism as set forth in claim 1, a pulse having a phase such that the ratchet lever comes into contact with a cam portion formed on the ratchet gear is applied to the step motor. What is claimed is: 1. A malfunction prevention device for a lens drive mechanism with a shutter drive mechanism, characterized in that the step motor is rotated in the normal direction after the step motor is applied to the shutter drive mechanism.