Distance measurement apparatus for camera

Details Distance measurement apparatus for camera Distance measurement apparatus for camera

1988-05-11

1989-05-02

Adams, Russell E.

G03B 300

Patent

active

048273023

ABSTRACT:
According to the invention, a distance measurement apparatus for a camera is disclosed. In this apparatus, a plurality of light-emitting elements are arranged at different positions in a direction perpendicular to a base line and an optical axis of projected light. A driver causes the light-emitting elements to selectively emit near-distance measurement light and far-distance measurement light having a higher intensity than that of the near-distance measurement light. When an amount of light reflected by an object cannot reach a predetermined value necessary for distance measurement upon emission of a light-emitting element selected by the driver, a microcomputer controls an operation of the driver so as to cause another light-emitting element to emit light. The near- or far-distance measurement light reflected by the object is received so as to measure a distance to the object.

REFERENCES:
patent: 4065778 (1977-12-01), Harvey
patent: 4615616 (1986-10-01), Shiomi
patent: 4733062 (1988-03-01), Horikawa
patent: 4740806 (1988-04-01), Takehana
patent: 4748469 (1988-05-01), Tamura
patent: 4773751 (1988-09-01), Matsuda et al.

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