Title:
【発明の名称】オートフォーカス装置
Document Type and Number:
Japanese Patent JP2742741
Kind Code:
B2
Abstract:
PURPOSE:To prevent undesired movement of a focus lens when a focus evaluation value is changed regardless of a focusing state. CONSTITUTION:A level of a prescribed frequency band component included in a luminance signal is detected by a detection circuit 16 and sampled at a sampling circuit 24. A maximum value of the sampled level is held by a peak hold circuit 22 and the sampling values for a period are integrated by an integration circuit 23. So long as the peak level held in the peak hold circuit 22 is not changed, a focus control means is set to a state when the integration value integrated by the integration circuit 23 is a maximum value.
Inventors:
Miyake Makoto
Application Number:
JP30884591A
Publication Date:
April 22, 1998
Filing Date:
November 25, 1991
Export Citation:
Assignee:
Sharp Corporation
International Classes:
G02B7/28; H04N5/232; (IPC1-7): H04N5/232; G02B7/28
Domestic Patent References:
| JP63203069A | ||||
| JP63197176A |
Attorney, Agent or Firm:
Fukami Hisaro