Automatic focusing circuit using a two period detection interval

Details Automatic focusing circuit using a two period detection interval Automatic focusing circuit using a two period detection interval

1988-02-16

1989-08-01

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358225, H04N 5232

Patent

active

048537896

ABSTRACT:
In an automatic focusing circuit of a video camera, an automatic focusing operation is performed by a focus evaluating value produced in response to a video signal obtained in an image sensing circuit (4). A focusing motor control circuit (14) controls rotation of a focusing motor (3) so that a focusing lens (1) is once fixed in the position where the focus evaluating value takes the maximum value. Then, a control circuit (14) resumes the automatic focusing operation after a lapse of a second time period when it is determined that the focus evaluating value was decreased to a predetermined level during a first time period and maintained the level over the second time period, and does not resume the automatic focusing operation when it is determined that the focus evaluating value did not maintain the level. On the other hand, the control circuit (14) resumes the automatic focusing operation after a lapse of the first time period when it is determined that a time period which is more than the first time period is required until the focus evaluating value attains the predetermined level.

REFERENCES:
patent: 4531158 (1985-07-01), Murakami et al.
patent: 4614975 (1986-09-01), Kaite
patent: 4638364 (1987-01-01), Hiramatu
patent: 4647979 (1987-03-01), Urata

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