Camera with infrared beam type remote controller

Details Camera with infrared beam type remote controller Camera with infrared beam type remote controller

1993-10-07

1996-02-13

Blankenship, Howard B.

Optics: measuring and testing

Range or remote distance finding

With photodetection

354403, 356 401, G03B 1738

Patent

active

054915295

ABSTRACT:
A camera according to the present invention prevents distance measurement errors in remote control shots under high luminance and those in which the distance of a background between right and left objects is measured, by projecting a remote control signal including a ranging signal in a form of infrared beam from a transmitter. The ranging signal, within the remote control signal, includes multiple pulses with different pulse widths, and each pulse width is set so that the number of pulses received by the receiving circuit becomes fewer accordingly as the distance between the transmitter and a receiver provided in the camera becomes larger. When the receiver receives a ranging signal from the transmitter, a distance recognizing unit counts a pulse number of the ranging signal received by the receiver, and recognizes the distance to the transmitter, namely the object, from the relationship of received pulse numbers and distance stored in a memory unit.

REFERENCES:
patent: 4408288 (1983-10-01), Kondo et al.
patent: 4601557 (1986-07-01), Bogle et al.
patent: 4998125 (1991-04-01), Watanabe et al.

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