JPS55108642A - Focus indicator of camera - Google Patents
Focus indicator of cameraInfo
- Publication number
- JPS55108642A JPS55108642A JP1525379A JP1525379A JPS55108642A JP S55108642 A JPS55108642 A JP S55108642A JP 1525379 A JP1525379 A JP 1525379A JP 1525379 A JP1525379 A JP 1525379A JP S55108642 A JPS55108642 A JP S55108642A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- waveforms
- peak
- subject image
- converted
- 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
- Focusing (AREA)
- Indication In Cameras, And Counting Of Exposures (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE: To achieve simpler construction by converting the contrast signal of the subject image to sound.
CONSTITUTION: A sounding body 13 is connected via amplifier circuit 5, sample holding circuit 6, smoothing circuit 7, differentiating circuit 8, absolute value circuit 9, peak-to-peak value detecting circuit 10, V-F converter 11 and amplifier circuit 12 to the self-scanning type photoelectric element 3 which forms the image of the subject 1 through a lens 2. Then, when the luminance distribution of the subject image is electrically scanned and discrete time series photoelectric conversion waveforms are formed, the time series waveforms are converted to analog waveforms and are corrected to the same waveforms as the luminance distribution of the subject image. Further, they are differentiated and converted to absolute value, after which the peak-to-peak value within the scanning period is detected, by which intermittent oscillation sounds or oscillation sounds of various timbres are formed and the focusing is indicated by the recognition of the maximum frequency or maximum sound volume.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1525379A JPS55108642A (en) | 1979-02-13 | 1979-02-13 | Focus indicator of camera |
GB8003678A GB2047905B (en) | 1979-02-13 | 1980-02-04 | Focus indicating device for a camera |
DE19803005043 DE3005043C2 (en) | 1979-02-13 | 1980-02-11 | Automatic focus indicator for a camera |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1525379A JPS55108642A (en) | 1979-02-13 | 1979-02-13 | Focus indicator of camera |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55108642A true JPS55108642A (en) | 1980-08-21 |
Family
ID=11883682
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1525379A Pending JPS55108642A (en) | 1979-02-13 | 1979-02-13 | Focus indicator of camera |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55108642A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4934831A (en) * | 1972-07-31 | 1974-03-30 | ||
JPS5112982U (en) * | 1974-07-17 | 1976-01-30 |
-
1979
- 1979-02-13 JP JP1525379A patent/JPS55108642A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4934831A (en) * | 1972-07-31 | 1974-03-30 | ||
JPS5112982U (en) * | 1974-07-17 | 1976-01-30 |
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