Distance measuring device using both active and passive distance

Details Distance measuring device using both active and passive distance Distance measuring device using both active and passive distance

1990-06-29

1992-01-14

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502018, 356 1, G01J 120

Patent

active

050813447

ABSTRACT:
A distance measuring device for use in automatic focusing of a camera combines an active system, in which light is projected onto an object and the distance of the object is measured in accordance with the received position of the reflected light on a line sensor, with a passive system in which the distance of the object is measured in accordance with a difference between the phases of two object images respectively formed in the line sensor through a pair of light receiving optical systems. The device uses both the light receiving optical systems and line sensors. Which of the active and passive system is used for measurement is decided in accordance with the light receiving position of the line sensor or the amount of the reflected projected light component.

REFERENCES:
patent: 4818865 (1989-04-01), Matsui et al.
patent: 4843227 (1989-06-01), Matsui et al.

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