JPS5762013A - Focusing detecting circuit - Google Patents

Focusing detecting circuit

Info

Publication number
JPS5762013A
JPS5762013A JP13636680A JP13636680A JPS5762013A JP S5762013 A JPS5762013 A JP S5762013A JP 13636680 A JP13636680 A JP 13636680A JP 13636680 A JP13636680 A JP 13636680A JP S5762013 A JPS5762013 A JP S5762013A
Authority
JP
Japan
Prior art keywords
distance
turns
led4
led2
pulses
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
JP13636680A
Other languages
Japanese (ja)
Inventor
Akira Takahashi
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 JP13636680A priority Critical patent/JPS5762013A/en
Priority to US06/299,291 priority patent/US4479706A/en
Priority to DE3135710A priority patent/DE3135710A1/en
Publication of JPS5762013A publication Critical patent/JPS5762013A/en
Priority to US06/599,772 priority patent/US4533227A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
    • G03B3/10—Power-operated focusing

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)

Abstract

PURPOSE:To enable continuous distance measurement and to perform the distance measurement accurately, by advancing the distance measuring operation in prescribed sequence. CONSTITUTION:On the basis of pulses phi1, a projector LED1 emits light to an object 4 intermittently and reflected light from the object 4 is converted 5 into an electric signal, which is integrated at 8 through an analog switch S1. An intergral output is compared with reference voltages ref1 and ref2, respectively and latched by pulses phi2. When the object is at close distance, an LED2 turns on, and when at intermediate distance, an LED3 turns on; and when it is at long distance, an LED4 turns on. The respective LED2-LED4 turn on in a finder to display the distance.
JP13636680A 1980-09-09 1980-09-30 Focusing detecting circuit Pending JPS5762013A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP13636680A JPS5762013A (en) 1980-09-30 1980-09-30 Focusing detecting circuit
US06/299,291 US4479706A (en) 1980-09-09 1981-09-03 Distance measuring circuit
DE3135710A DE3135710A1 (en) 1980-09-09 1981-09-09 DISTANCER SWITCHING ARRANGEMENT
US06/599,772 US4533227A (en) 1980-09-09 1984-04-13 Distance measuring circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13636680A JPS5762013A (en) 1980-09-30 1980-09-30 Focusing detecting circuit

Publications (1)

Publication Number Publication Date
JPS5762013A true JPS5762013A (en) 1982-04-14

Family

ID=15173481

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13636680A Pending JPS5762013A (en) 1980-09-09 1980-09-30 Focusing detecting circuit

Country Status (1)

Country Link
JP (1) JPS5762013A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60100009A (en) * 1983-11-05 1985-06-03 Ricoh Co Ltd Detecting device of distance
JPS60168034A (en) * 1984-02-13 1985-08-31 Tokuda Seisakusho Ltd Leak testing device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5518690A (en) * 1978-07-21 1980-02-08 Agfa Gevaert Ag Camera focus adjuster

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5518690A (en) * 1978-07-21 1980-02-08 Agfa Gevaert Ag Camera focus adjuster

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60100009A (en) * 1983-11-05 1985-06-03 Ricoh Co Ltd Detecting device of distance
JPS60168034A (en) * 1984-02-13 1985-08-31 Tokuda Seisakusho Ltd Leak testing device

Similar Documents

Publication Publication Date Title
JPS56130608A (en) Range finding system
JPS5527987A (en) Distance measuring instrument
ATE25313T1 (en) MEASURING ARRANGEMENT WITH A NUMBER OF MEASURING POINTS CONNECTED BY A CABLE.
JPS5762013A (en) Focusing detecting circuit
GB2076547A (en) Resistance Measuring Circuit
JPS56138206A (en) Displacement measuring equipment
JPS57201664A (en) Ink residual quantity detector
JPS57110980A (en) Wrist watch with sphygmometer
JPS5762014A (en) Range finding circuit
JPS5726761A (en) Electronic watt-hour meter
JPS5679946A (en) Optical densitometer
JPS5518906A (en) Photoelectric position locator
JPS5724850A (en) Clouding point measuring device
JPS5748665A (en) Resistance component measuring circuit
JPS5764106A (en) Indicating meter
JPS5524676A (en) Infrared thermometer
JPS5229777A (en) Small-size measuring instrument
JPS51114978A (en) Light source of pulse light emission
JPS5766383A (en) Electronic timepiece with illuminometer
JPS52120704A (en) Individual selection call receiver
JPS5565110A (en) Distance meter
JPS5676666A (en) Detection circuit for call-out signal
JPS574664A (en) Beam diameter measuring device of cathode-ray tube
JPS5682455A (en) High voltage direct current measuring apparatus
SU146369A1 (en) Device for measuring voltage levels