JPS647774A - Autofocus video camera - Google Patents
Autofocus video cameraInfo
- Publication number
- JPS647774A JPS647774A JP62294938A JP29493887A JPS647774A JP S647774 A JPS647774 A JP S647774A JP 62294938 A JP62294938 A JP 62294938A JP 29493887 A JP29493887 A JP 29493887A JP S647774 A JPS647774 A JP S647774A
- Authority
- JP
- Japan
- Prior art keywords
- focus
- lens
- evaluation value
- autofocussing
- action
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE:To always achieve stable autofocussing action rapidly without malfunction by providing a zooming mechanism, a focus evaluation value detecting means, a focus lens moving means, and respective response characteristic switching means. CONSTITUTION:From an image formed by a lens 1, an illluminating signal is generated by an image pickup circuit 4 and inputted to a focus evaluation ganerating circuit 5. After starting autofocussing action, first focus evaluation value is held in a maximum value memory 10 and an initial value memory 11. Thereafter, a first focus motor control circuit 15 rotates a focus motor 3, monitors a second comparator 13, and compares a focus evaluation value with the evaluation value held in the memory 11 to output the result. After executing such quick autofocussing action as above, the lens is stopped, and the lens is finely adjusted positionally by a second focus motor control circuit 17 even if the lens stops at a position out of focus because of a violent moving of an object. In such a way, the zooming area of the zoom lens can be detected, as well as a focus position can be detected rapidly.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62294938A JPH0644807B2 (en) | 1986-12-19 | 1987-11-20 | Autofocus video camera |
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61-304411 | 1986-12-19 | ||
JP30441186 | 1986-12-19 | ||
JP4340687 | 1987-02-26 | ||
JP62-43406 | 1987-02-26 | ||
JP62-43405 | 1987-02-26 | ||
JP4340587 | 1987-02-26 | ||
JP62294938A JPH0644807B2 (en) | 1986-12-19 | 1987-11-20 | Autofocus video camera |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5252959A Division JPH0754971B2 (en) | 1993-10-08 | 1993-10-08 | Autofocus video camera |
JP5252958A Division JPH0754970B2 (en) | 1993-10-08 | 1993-10-08 | Autofocus video camera |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS647774A true JPS647774A (en) | 1989-01-11 |
JPH0644807B2 JPH0644807B2 (en) | 1994-06-08 |
Family
ID=27461362
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62294938A Expired - Lifetime JPH0644807B2 (en) | 1986-12-19 | 1987-11-20 | Autofocus video camera |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0644807B2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04212320A (en) * | 1991-03-27 | 1992-08-03 | Tokyo Electric Co Ltd | Vacuum cleaner |
JPH04212319A (en) * | 1991-03-27 | 1992-08-03 | Tokyo Electric Co Ltd | Vacuum cleaner |
JPH10233962A (en) * | 1996-08-16 | 1998-09-02 | Fuji Photo Film Co Ltd | Automatic focus adjustment device for film scanner |
US6621521B1 (en) | 1996-07-26 | 2003-09-16 | Fuji Photo Film Co., Ltd. | Automatic focusing device for film scanner |
JP2007279659A (en) * | 2006-03-16 | 2007-10-25 | Matsushita Electric Ind Co Ltd | Variable focal lens and imaging apparatus |
WO2013100131A1 (en) | 2011-12-28 | 2013-07-04 | 株式会社東芝 | Electric vacuum cleaner |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58179067A (en) * | 1982-04-15 | 1983-10-20 | Copal Co Ltd | Automatic focus controller |
JPS60102606A (en) * | 1983-11-09 | 1985-06-06 | Sanyo Electric Co Ltd | Auto focus controlling circuit |
-
1987
- 1987-11-20 JP JP62294938A patent/JPH0644807B2/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58179067A (en) * | 1982-04-15 | 1983-10-20 | Copal Co Ltd | Automatic focus controller |
JPS60102606A (en) * | 1983-11-09 | 1985-06-06 | Sanyo Electric Co Ltd | Auto focus controlling circuit |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04212320A (en) * | 1991-03-27 | 1992-08-03 | Tokyo Electric Co Ltd | Vacuum cleaner |
JPH04212319A (en) * | 1991-03-27 | 1992-08-03 | Tokyo Electric Co Ltd | Vacuum cleaner |
US6621521B1 (en) | 1996-07-26 | 2003-09-16 | Fuji Photo Film Co., Ltd. | Automatic focusing device for film scanner |
US6989864B2 (en) | 1996-07-26 | 2006-01-24 | Fuji Photo Film Co., Ltd. | Automatic focusing device for film scanner |
JPH10233962A (en) * | 1996-08-16 | 1998-09-02 | Fuji Photo Film Co Ltd | Automatic focus adjustment device for film scanner |
JP2007279659A (en) * | 2006-03-16 | 2007-10-25 | Matsushita Electric Ind Co Ltd | Variable focal lens and imaging apparatus |
US8068286B2 (en) | 2006-03-16 | 2011-11-29 | Panasonic Corporation | Variable focal lens and imaging apparatus |
WO2013100131A1 (en) | 2011-12-28 | 2013-07-04 | 株式会社東芝 | Electric vacuum cleaner |
Also Published As
Publication number | Publication date |
---|---|
JPH0644807B2 (en) | 1994-06-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term | ||
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080608 Year of fee payment: 14 |