Distance measuring apparatus and focusing device
AssigneeSeiko Precision Inc.
InventorYoshiro Kurokawa
Life of this patent
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Abstract
An object being distance-measured is detected of its status change by a simple structure. A processing operating circuit 7 samples and stores outputs of a monitor cell 8 and compares between a value sampled in the last time and a value sampled in the present time. When a difference thereof is out of a predetermined range, it is determined that the state of a subject has changed due to movement or the like of the subject and the output of the monitor cell 8 has changed thus outputting a detection signal to a terminal D. A control-logic 12 causes a gate section 2 due to an input of the detection signal to forcibly end the storage operation of a line sensor section 1. Meanwhile, due to the detection signal outputted on the terminal D, an alarm section 14 gives alarm that the subject has moved.
Claims3
A distance measuring apparatus comprising:
- a monitor element for generating an output depending on an intensity of light of an object;
- a charge-storage type light receiving element formed by a plurality of pixels for receiving the light of the object;
- a control circuit for controlling storage operation of said charge-storage type light receiving element depending on the output of said monitor element;
- a distance detecting circuit for detecting a distance to said object by a photoelectric output of said charge-storage type light receiving element;
- and
- a detection-signal output circuit for outputting a detection signal when there is change in output of said monitor element during storage operation of said charge-storage type light receiving element.
Dependencies are inferred from the claim text.