JPS55105229A - Focusing detector - Google Patents
Focusing detectorInfo
- Publication number
- JPS55105229A JPS55105229A JP1201579A JP1201579A JPS55105229A JP S55105229 A JPS55105229 A JP S55105229A JP 1201579 A JP1201579 A JP 1201579A JP 1201579 A JP1201579 A JP 1201579A JP S55105229 A JPS55105229 A JP S55105229A
- Authority
- JP
- Japan
- Prior art keywords
- focusing
- register
- signal
- optical system
- data
- 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
Landscapes
- Automatic Focus Adjustment (AREA)
- Focusing (AREA)
Abstract
PURPOSE: To improve the responsiveness of focusing operation and ease the incorporation into a small-size camera by converting contrast to digital signal, compare the change in said signal with time and driving the focusing device.
CONSTITUTION: When a photographic lens system 8 and a focusing optical system 2 are in a focus position, the image of a detecting face 10 shows sharp contrast as compared to that at the non-focusing. When the focusing operation is started, a control pulse generator 18 generates the synchronizing pulses of a fixed period and an A/D conversion register 5 is inputted with the level signal of the generator 4 and stores the same as L or H level signal. A comparator 7 compares the contents of the data D1 of the register 5 and the data D2 of the register 6 and causes an LEd to light when D1>D2. This lighting light is applied to a control unit 20. The unit 20 drives a motor 12 in its forward running direction which in turn moves the optical system 2 and lens system 8 from, e.g., ∞ position to a near distance position.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1201579A JPS55105229A (en) | 1979-02-05 | 1979-02-05 | Focusing detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1201579A JPS55105229A (en) | 1979-02-05 | 1979-02-05 | Focusing detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55105229A true JPS55105229A (en) | 1980-08-12 |
Family
ID=11793760
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1201579A Pending JPS55105229A (en) | 1979-02-05 | 1979-02-05 | Focusing detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55105229A (en) |
-
1979
- 1979-02-05 JP JP1201579A patent/JPS55105229A/en active Pending
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