Blade driving devie for projector

Abstract

A blade driving device for use in cameras includes a mechanical shutter blade that is openably and closably disposed in front of a CCD and that is capable of blocking light passing through an exposure aperture, a motor that drives a shutter blade, and a control means that drive-controls the motor. In this blade driving device, photography is performed such that the storage of an electric charge starts in the CCD and the closing motion of the shutter blade is completed. Opening energization is applied to the motor in order to allow the shutter blade to pre-perform an opening motion before performing a closing motion whenever a still image is photographed. Thus, the shutter blade always reaches an opened state prior to photography even if the shutter blade is closed without permission by receiving an impulsive force from the outside because of, for example, its being dropped. Therefore, photography can be reliably performed.

Description

technical field [0001] The present invention relates to a blade driving device for a video camera which can be opened and closed in front of an imaging element and can block or reduce a part or all of light passing through an opening for exposure, and particularly relates to a blade drive device mounted on a mobile phone or a portable personal computer. Blade drive device for cameras on mobile information terminals such as Background technique [0002] As a conventional digital still camera having an imaging element such as a CCD (charge-coupled device), it is known to have a mechanical shutter blade that opens and closes an optical path disposed in front of the CCD. The shutter blade of the type is kept in an open state, as shown in Figure 1, when the shutter operates, the CCD starts to accumulate charge and the specified exposure time passes, the electromagnetic actuator such as the motor is turned off and energized and controlled to be mechanical A state where the shutte...

AI Technical Summary

Problems solved by technology

[0004] On the other hand, such a mechanical shutter blade, for example, is applied to a portable video camera mounted on a mobile phone, a portable personal computer, etc., because the frequency of use is higher than that of a general digital video camera, so it may be accidentally dropped or There is an increased chance of receiving an external impact such as colliding with another object

[0005] Therefore, in the shooting standby state, when such an impact force or the like is applied from the outside, the shutter blades held in the open state will be closed arbitrarily due to the impact force, so there may be a problem that shooting cannot be performed.

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