Automatic focus apparatus

Details Automatic focus apparatus Automatic focus apparatus

G - Physics

03

B

88/94.5

G03B 3/10 (2006.01) G02B 7/30 (2006.01)

Patent

CA 1038211

APPLICATION OF NORMAN L. STAUFFER AUTOMATIC FOCUS APPARATUS ABSTRACT A focus control system for a still camera includes a photo- electric amplifier and a high frequency spatial filter. The filter is arranged to scan the image region of a fixed focus lens as the taking lens of the camera is moved from an extended posi- tion toward the infinity position thereof. During a first portion of the scanning movement the filter provides an initial signal representative of the brightness of the imaging light bundles for automatic gain control. The gain of a photosensitive detector is initially set during this period. During a second portion of the scanning movement, the filter moves through the image space and continues to provide a signal for adjusting the gain of the detector. This signal has a maximum amplitude signal as the filter passes through the actual image. A change of slope detec- tor senses this position and actuates a mechanical stop to freeze the position of the taking lens at that position. It is contem- plated that the shutter of the camera would then be released to initiate the exposure.

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