Automatic focus adjusting device

Details Automatic focus adjusting device Automatic focus adjusting device

1984-09-12

1985-05-21

Adams, Russell E.

G03B 300

Patent

active

045182426

ABSTRACT:
The disclosed automatic focus adjusting device has a first distance measuring circuit of the active type and a second distance measuring circuit of the passive type. Based on output signals from the distance measuring circuits, a focusing lens is driven by either the first or second distance measuring circuits. When switching between distance measuring circuits to obtain a change in output signals from the distance measuring circuits, the system makes the selected measuring circuit continue operating until the output signal exceeds a prescribed range of values.

REFERENCES:
patent: 4423936 (1984-01-01), Johnson

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