JPS6486123A - Blurring shake preventing device for camera - Google Patents

Abstract

PURPOSE:To prevent a shutter chance from being missed by releasing a shutter an exposure preparatory operation time later if it is predicted that the time when a blurring becomes minimum for the 1st time after the time required for preparation from the depression of a shutter release button to the opening and closure of the shutter exceeds a predetermined limit time. CONSTITUTION:When the release button S2 is pressed, a blurring is normally generated, so this blurring is detected by the blurring detector 24 consisting of an acceleration sensor 3, an oscillator 4, and a frequency discriminator 5. A blurring arithmetic part 6 receives data corresponding to blur waveform from the blurring detector 2 and calculate the period of the blur by utilizing the single vibration of the blurring in its beginning to determine the time when the direction of the blurring changes, i.e. the time when the blurring becomes minimum. This time is contrasted with a preparatory operation time inputted to this blurring arithmetic part 6 previously to calculate a specific time, with which the shutter is driven and opened and closed for an expected exposure time. Consequently, no shutter change is missed.