Focus adjusting device wherein effective focal length is derived

Details Focus adjusting device wherein effective focal length is derived Focus adjusting device wherein effective focal length is derived

1994-04-08

1996-08-06

Greening, Wendy R.

Television

Camera, system and detail

Optics

348345, H04N 5232

Patent

active

055438393

ABSTRACT:
A focus adjusting device having an added capability of discriminating effective focal length information by using an image signal produced from an image pickup element is provided with an automatic focus adjusting circuit for moving a lens to the in-focus position on the basis of a high-frequency component in the image signal, and a circuit for discriminating effective focal length information of the lens from the degree of change of a low-frequency component in the image signal, wherein the gain of the automatic focus adjusting circuit is controlled in accordance with the discriminated focal length information.

REFERENCES:
patent: 4611244 (1986-09-01), Hanma et al.
patent: 4735494 (1988-04-01), Makino et al.
patent: 4902115 (1990-02-01), Takahashi

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