1987-07-13
1988-03-08
Hix, L. T.
354400, G03B 300
Patent
active
047302011
ABSTRACT:
An automatic focus adjustment apparatus of this invention is constituted by: position detector for detecting the position of a photographing lens to be driven to the in-focus position in accordance with the state of focus; a memory section for storing therein a given position of the photographing lens which is specified by an operator; a command generator for generating a command for the photographing lens to be shifted to the thus-stored position; a difference calculating circuit for calculating the difference between the thus-stored position and the current focus position of the photographing lens; and a drive controller for controlling a drive motor so that the drive motor may drive the photographing lens to the stored position in response to the command from the command generator and in accordance with the thus-calculated difference. The command generator issues a command in correspondence with a desired focus position of the photographing lens. In response to the command, the drive controller controls the drive motor so that it may drive the photographing lens toward the stored position in accordance with the difference between the stored position and the current position which is calculated by the difference calculating circuit.
REFERENCES:
patent: 4314748 (1982-02-01), Kawabata et al.
patent: 4557577 (1985-12-01), Shinoda
Gray David M.
Hix L. T,.
Nippon Kogaku K. K.
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