Automatic focusing device with range boundary setting

Details Automatic focusing device with range boundary setting Automatic focusing device with range boundary setting

1984-08-20

1987-01-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354403, 356 4, G01J 120

Patent

active

046395881

ABSTRACT:
An automatic imaging lens focusing device comprises a detector for detecting a near focus state, a far focus state or an in-focus state of an imaging lens to an object and producing a corresponding signal, a driver for driving the imaging lens in accordance with the signal from the detector, a lens position detector for detecting a position of the imaging lens, a memory for storing two lens positions detected by the lens position detection means in response to a store signal, a switch for producing the store signal and a control circuit for permitting the operation of the driver between the two lens positions stored in the memory while inhibiting the driver operation beyond the stored lens positions.

REFERENCES:
patent: 4284335 (1981-08-01), Takemae et al.
patent: 4293206 (1981-10-01), Tokutomi et al.
patent: 4294527 (1981-10-01), Hashimoto et al.
patent: 4300823 (1981-11-01), Yamanaka et al.
patent: 4314748 (1982-02-01), Kawabata et al.
patent: 4336987 (1982-06-01), Shenk
patent: 4443078 (1984-04-01), Niwa et al.

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