JPS55111925A - Focusing point signal generator - Google Patents

Focusing point signal generator

Info

Publication number
JPS55111925A
JPS55111925A JP1892079A JP1892079A JPS55111925A JP S55111925 A JPS55111925 A JP S55111925A JP 1892079 A JP1892079 A JP 1892079A JP 1892079 A JP1892079 A JP 1892079A JP S55111925 A JPS55111925 A JP S55111925A
Authority
JP
Japan
Prior art keywords
focusing
signal
distance
point signal
focusing point
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
Application number
JP1892079A
Other languages
Japanese (ja)
Other versions
JPS5933881B2 (en
Inventor
Akira Takahashi
Susumu Iguchi
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP1892079A priority Critical patent/JPS5933881B2/en
Publication of JPS55111925A publication Critical patent/JPS55111925A/en
Publication of JPS5933881B2 publication Critical patent/JPS5933881B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Focusing (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE: To stably create the focusing point signal in the automatic fucusing device by performing the generation and OFF of the focusing point signal at the specified time.
CONSTITUTION: Front and rear focuses are displayed in lamps 8, 10 through AND gates 5, 6 according to the front and rear focus decision signals from the comparison part of a module for automatic focus detection inputted from terminal 7. When the photographing lens is moved by turning its distance ring, the decision signal inputted to the terminal 7 inverts in the focusing position, causing an FF 4 to be set by way of an inverter 9, differentiation circuits 12, 11 and OR circuit 13 then the gates 6, 5 become forbidden state, to go off the lamps 8, 10. At the same time, the focusing display lamp 14 to which the set output of the FF 14 is applied as the focusing signal lights up. Thence, the FF4 is reset by way of the differentiation circuit 16 by the turning angle signal of the distance ring applied at the time when the photographing distance by the photographing lens moving together with the distance ring deviates from the preset allowable distance range. The focusing signal then goes ON, thus the focusing signal is stably created.
COPYRIGHT: (C)1980,JPO&Japio
JP1892079A 1979-02-20 1979-02-20 Focus signal generator Expired JPS5933881B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1892079A JPS5933881B2 (en) 1979-02-20 1979-02-20 Focus signal generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1892079A JPS5933881B2 (en) 1979-02-20 1979-02-20 Focus signal generator

Publications (2)

Publication Number Publication Date
JPS55111925A true JPS55111925A (en) 1980-08-29
JPS5933881B2 JPS5933881B2 (en) 1984-08-18

Family

ID=11985040

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1892079A Expired JPS5933881B2 (en) 1979-02-20 1979-02-20 Focus signal generator

Country Status (1)

Country Link
JP (1) JPS5933881B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5772115A (en) * 1980-10-23 1982-05-06 Canon Inc Output stablizing circuit for focus detector
JPS57157224A (en) * 1981-03-23 1982-09-28 Olympus Optical Co Ltd Display device for focusing of camera
JPS57208520A (en) * 1981-06-19 1982-12-21 Hitachi Ltd Automatic focusing device
JPS58126440U (en) * 1982-02-22 1983-08-27 旭光学工業株式会社 Camera viewfinder display device
JPS593406A (en) * 1982-06-29 1984-01-10 Olympus Optical Co Ltd Detector for focusing state
US4561746A (en) * 1983-06-15 1985-12-31 Minolta Camera Kabushiki Kaisha Focus detection device and automatic focusing device for camera

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5772115A (en) * 1980-10-23 1982-05-06 Canon Inc Output stablizing circuit for focus detector
JPS57157224A (en) * 1981-03-23 1982-09-28 Olympus Optical Co Ltd Display device for focusing of camera
JPH0147763B2 (en) * 1981-03-23 1989-10-16 Olympus Optical Co
JPS57208520A (en) * 1981-06-19 1982-12-21 Hitachi Ltd Automatic focusing device
JPH0230486B2 (en) * 1981-06-19 1990-07-06 Hitachi Ltd
JPS58126440U (en) * 1982-02-22 1983-08-27 旭光学工業株式会社 Camera viewfinder display device
JPH0452737Y2 (en) * 1982-02-22 1992-12-11
JPS593406A (en) * 1982-06-29 1984-01-10 Olympus Optical Co Ltd Detector for focusing state
JPH0254523B2 (en) * 1982-06-29 1990-11-21 Olympus Optical Co
US4561746A (en) * 1983-06-15 1985-12-31 Minolta Camera Kabushiki Kaisha Focus detection device and automatic focusing device for camera

Also Published As

Publication number Publication date
JPS5933881B2 (en) 1984-08-18

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