JPS5581325A - Distance measuring device of camera - Google Patents
Distance measuring device of cameraInfo
- Publication number
- JPS5581325A JPS5581325A JP15557678A JP15557678A JPS5581325A JP S5581325 A JPS5581325 A JP S5581325A JP 15557678 A JP15557678 A JP 15557678A JP 15557678 A JP15557678 A JP 15557678A JP S5581325 A JPS5581325 A JP S5581325A
- Authority
- JP
- Japan
- Prior art keywords
- luminance
- subject
- value
- absolute value
- output
- 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
- 238000001514 detection method Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
Landscapes
- Focusing (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE: To judge whether the subject is of the luminance suited for automatic focusing operation or not by comparing the change rate of the absolute value of the detected two signals difference for distance measurement with a set value and judging the suitability of the luminance.
CONSTITUTION: The two detection signals for focusing detected by two sets of photoelectric transducers 7, 8 is applied via difference detecting circuit to an absolute value circuit 11. The differential absolute value is differentiated by a differentiating circuit 12 and the change rate of the differential absoulte value voltage with time is compared with a set voltage in a voltage comparator 12. When the subject luminance is above the specified value and the differentiated output of the absolute value difference is more than the set value, an FF17 is set by the comparing output of the circuit 15, by which an FF18 is set. While the subject luminance is high, a display lamp 22 is lighted by the high level set output of the FF18. When the subject luminance is low, the low level output of the FF18 lights a warning indicator lamp 21 to warn that the subject luminance is inadequate for automatic focusing operation. Hence, the operation of automatic focusing, etc. of large errors by the low luminance subject may be stopped.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15557678A JPS5581325A (en) | 1978-12-16 | 1978-12-16 | Distance measuring device of camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15557678A JPS5581325A (en) | 1978-12-16 | 1978-12-16 | Distance measuring device of camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5581325A true JPS5581325A (en) | 1980-06-19 |
Family
ID=15609060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15557678A Pending JPS5581325A (en) | 1978-12-16 | 1978-12-16 | Distance measuring device of camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5581325A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58117528A (en) * | 1982-01-06 | 1983-07-13 | Hitachi Denshi Ltd | Signal processing system for automatic focusing camera |
| KR100704764B1 (en) * | 2000-07-26 | 2007-04-09 | 삼성테크윈 주식회사 | Passive auto focusing apparatus and method, and camera system comprising the apparatus |
-
1978
- 1978-12-16 JP JP15557678A patent/JPS5581325A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58117528A (en) * | 1982-01-06 | 1983-07-13 | Hitachi Denshi Ltd | Signal processing system for automatic focusing camera |
| KR100704764B1 (en) * | 2000-07-26 | 2007-04-09 | 삼성테크윈 주식회사 | Passive auto focusing apparatus and method, and camera system comprising the apparatus |
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