JPS57150826A - Lens motor driving system of auto-focusing camera - Google Patents
Lens motor driving system of auto-focusing cameraInfo
- Publication number
- JPS57150826A JPS57150826A JP3617781A JP3617781A JPS57150826A JP S57150826 A JPS57150826 A JP S57150826A JP 3617781 A JP3617781 A JP 3617781A JP 3617781 A JP3617781 A JP 3617781A JP S57150826 A JPS57150826 A JP S57150826A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- lens
- focusing
- motor
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
- G03B3/10—Power-operated focusing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Focusing (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE:To drive a lens up to a focusing position by making a large current flow to a lens motor when it is not focused, by deciding whether a lens which has reached around its focusing position is focused or not, in a prescribed time ater only a small current has flowed to the lens motor. CONSTITUTION:An automatic focus controlling circuit 5 forms a prepin signal (a), a postpin signal (c) and a focusing deviation signal (b) in accordancd with a signal from a photoelectric element 3. These 3 signals are applied to a motor driving circuit 6, are used for driving a lens motor 7, also the prepin signal (a) and the postpin signal (c) are applied to a focusing deciding circuit 10 through an OR gate OR and an inverter INV, also the focusing deviation signal (b) is applied to a threshold value detecting circuit 8, its output is provided to a delaying circuit 9, the focusing deciding circuit 10 and a start pulse generating circuit 11 are operated by an output of the delaying circuit 9, a start pulse is generated and provided to the motor driving circuit 6, the lens motor 7 is driven, and the lens is moved to the focusing position.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3617781A JPS57150826A (en) | 1981-03-13 | 1981-03-13 | Lens motor driving system of auto-focusing camera |
US06/356,318 US4432620A (en) | 1981-03-13 | 1982-03-09 | Lens motor drive device in automatic focusing camera |
DE19823209036 DE3209036A1 (en) | 1981-03-13 | 1982-03-12 | LENS MOTOR CONTROL DEVICE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3617781A JPS57150826A (en) | 1981-03-13 | 1981-03-13 | Lens motor driving system of auto-focusing camera |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57150826A true JPS57150826A (en) | 1982-09-17 |
Family
ID=12462450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3617781A Pending JPS57150826A (en) | 1981-03-13 | 1981-03-13 | Lens motor driving system of auto-focusing camera |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57150826A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6022117A (en) * | 1996-10-09 | 2000-02-08 | Canon Kabushiki Kaisha | Illuminating device for projecting light |
US6078752A (en) * | 1996-10-09 | 2000-06-20 | Canon Kabushiki Kaisha | Illuminating device and photographing apparatus |
-
1981
- 1981-03-13 JP JP3617781A patent/JPS57150826A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6022117A (en) * | 1996-10-09 | 2000-02-08 | Canon Kabushiki Kaisha | Illuminating device for projecting light |
US6078752A (en) * | 1996-10-09 | 2000-06-20 | Canon Kabushiki Kaisha | Illuminating device and photographing apparatus |
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