JPS5723910A - Automatic focusing device - Google Patents
Automatic focusing deviceInfo
- Publication number
- JPS5723910A JPS5723910A JP9758480A JP9758480A JPS5723910A JP S5723910 A JPS5723910 A JP S5723910A JP 9758480 A JP9758480 A JP 9758480A JP 9758480 A JP9758480 A JP 9758480A JP S5723910 A JPS5723910 A JP S5723910A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- gate
- inputted
- motor
- signals
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Automatic Focus Adjustment (AREA)
- Focusing (AREA)
- Lens Barrels (AREA)
Abstract
PURPOSE:To speed the operation of a motor and to improve focusing precision by providing a means of varying the turning speed of the motor with the pulse width of a pulse signal and of prescribing the minimum limit of the pulse width. CONSTITUTION:Signals inputted from a focus detector to input terminals 1 and 2 are converted by comparators 3 and 4 into rectangular wave signals A and B. For example, the signal B leading the signal A in terms of phase. In this case, the signals A and B are inputted to an EX-OR gate 6, which supplies a phase difference signal C to an OR gate 10. The signals A and B are passed through an OR gate 7 to operate monostable multivibrators 8 and 9 by the signal B. The output E of the monostable multivibrator 8 is inputted to an OR gate 10, whose output signal H has pulse width greater than that of the signal C. The output signal F of the monostable multivibrator 9, on the other hand, serves as the clock signal of an FF11 to latch the signal C. The signal H and G are ANDed by an AND gate 12, whose output is inputted to an EX-OR gate 13, thereby controlling focusing by flowing a current IM, which depends upon a difference voltage K from a signal J from an FF5, to a motor M. Consequently, the speed of the motor is increased and focusing precision is improved.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9758480A JPS5723910A (en) | 1980-07-18 | 1980-07-18 | Automatic focusing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9758480A JPS5723910A (en) | 1980-07-18 | 1980-07-18 | Automatic focusing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5723910A true JPS5723910A (en) | 1982-02-08 |
JPH0232605B2 JPH0232605B2 (en) | 1990-07-23 |
Family
ID=14196281
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9758480A Granted JPS5723910A (en) | 1980-07-18 | 1980-07-18 | Automatic focusing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5723910A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5949522A (en) * | 1982-09-14 | 1984-03-22 | Nippon Kogaku Kk <Nikon> | Automatic focusing device |
JPS59159115A (en) * | 1983-03-01 | 1984-09-08 | Nippon Kogaku Kk <Nikon> | Automatic focusing device |
JPS59224806A (en) * | 1983-06-06 | 1984-12-17 | Hitachi Denshi Ltd | Focusing controller |
JPH0772374A (en) * | 1994-01-26 | 1995-03-17 | Nikon Corp | Position controller for photographing lens |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4990529A (en) * | 1972-12-27 | 1974-08-29 | ||
JPS50158327A (en) * | 1974-06-10 | 1975-12-22 | ||
JPS5484940U (en) * | 1977-11-29 | 1979-06-15 | ||
JPS54119232A (en) * | 1978-02-23 | 1979-09-17 | Asahi Optical Co Ltd | Automatic focusing controller |
-
1980
- 1980-07-18 JP JP9758480A patent/JPS5723910A/en active Granted
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4990529A (en) * | 1972-12-27 | 1974-08-29 | ||
JPS50158327A (en) * | 1974-06-10 | 1975-12-22 | ||
JPS5484940U (en) * | 1977-11-29 | 1979-06-15 | ||
JPS54119232A (en) * | 1978-02-23 | 1979-09-17 | Asahi Optical Co Ltd | Automatic focusing controller |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5949522A (en) * | 1982-09-14 | 1984-03-22 | Nippon Kogaku Kk <Nikon> | Automatic focusing device |
JPH0474684B2 (en) * | 1982-09-14 | 1992-11-26 | ||
JPS59159115A (en) * | 1983-03-01 | 1984-09-08 | Nippon Kogaku Kk <Nikon> | Automatic focusing device |
JPS59224806A (en) * | 1983-06-06 | 1984-12-17 | Hitachi Denshi Ltd | Focusing controller |
JPH0772374A (en) * | 1994-01-26 | 1995-03-17 | Nikon Corp | Position controller for photographing lens |
Also Published As
Publication number | Publication date |
---|---|
JPH0232605B2 (en) | 1990-07-23 |
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