Baffle plate opening/closing device of photographic lens

Abstract

Provided is a baffle plate opening / closing device of a photographic lens, comprising a lens baffle plate component, an electric drive source which drives the baffle plate component by a first voltage under normal state, a switch component for monitoring the opening / closing movement of the lens baffle plate component, an elastic component which clamps a part of the lens baffle plate component by apair of end parts, a displacement component which can be displaced with respect to the lens baffle plate component with one part being embedded between a pair of end parts. The displacement componentis displaced by bearing a driving force, and opens and closes the lens baffle plate component through the elastic component. The baffle plate opening / closing device also comprises a control componentwhich drives the electric drive source by the first voltage, making the displacement component be displaced and the lens baffle plate component move. When the switch component is judged that the movement of the lens baffle plate component is obstructed, a second voltage higher than the first voltage is applied to the electric drive source for driving the displacement component. In this case, the elastic component generates an additional accumulating force larger than a pre-accumulating force, and the displacement component moves with respect to the lens baffle plate component.

Description

technical field [0001] The present invention relates to a shutter opening and closing device for a photographing lens, and more specifically, to a shutter opening and closing device for opening and closing the front surface of a photographing lens. Background technique [0002] Conventionally, photographing devices (hereinafter referred to as cameras) that receive an optical image formed by a photographing lens and generate an image are widespread. Among cameras of this type, cameras equipped with a barrier opening and closing device for opening and closing an opening provided on the front surface of the photographing lens are generally put into practical use. [0003] For example, the barrier opening and closing device in the camera disclosed in Japanese Patent Application Laid-Open No. 2008-185728 is constituted as follows: the barrier opening and closing device includes a lens barrier member arranged so as to shield the photographing lens. The opening of the front surfac...

AI Technical Summary

Problems solved by technology

[0011] However, in the case of such a structure, since the baffle member is driven with the maximum driving force, when an obstacle such as sand grains bites, it may bite deeper due to the driving inertial force.

When this happens, it will become more difficult to eliminate the factors that hinder the movement of the shutter member, and the camera itself, which is the equipment to which the shutter opening and closing device is applied, may not be able to operate.

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