JPS55108642A - Focus indicator of camera - Google Patents

Focus indicator of camera

Info

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
Application number
JP1525379A
Other languages
Japanese (ja)
Inventor
Katsuhiko Miyata
Harumi Aoki
Kiyoshi Negishi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Priority to JP1525379A priority Critical patent/JPS55108642A/en
Priority to GB8003678A priority patent/GB2047905B/en
Priority to DE19803005043 priority patent/DE3005043C2/en
Publication of JPS55108642A publication Critical patent/JPS55108642A/en
Pending legal-status Critical Current

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
JP1525379A 1979-02-13 1979-02-13 Focus indicator of camera Pending JPS55108642A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4934831A (en) * 1972-07-31 1974-03-30
JPS5112982U (en) * 1974-07-17 1976-01-30

Patent Citations (2)

* Cited by examiner, † Cited by third party
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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