JPS5749906A - Distance measuring circuit - Google Patents

Distance measuring circuit

Info

Publication number
JPS5749906A
JPS5749906A JP12516980A JP12516980A JPS5749906A JP S5749906 A JPS5749906 A JP S5749906A JP 12516980 A JP12516980 A JP 12516980A JP 12516980 A JP12516980 A JP 12516980A JP S5749906 A JPS5749906 A JP S5749906A
Authority
JP
Japan
Prior art keywords
subject
amplifiers
hpf3
passed
component
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
JP12516980A
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 JP12516980A priority Critical patent/JPS5749906A/en
Priority to US06/299,291 priority patent/US4479706A/en
Priority to DE3135710A priority patent/DE3135710A1/en
Publication of JPS5749906A publication Critical patent/JPS5749906A/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)
  • Optical Radar Systems And Details Thereof (AREA)
  • Measurement Of Optical Distance (AREA)

Abstract

PURPOSE:To prevent malfunction due to the low saturation point of an amplifier, etc., by amplifying a photodetection signal by amplifiers differing in gain and by comparing the resulting signal with a reference voltage. CONSTITUTION:A projector LED1 projects light to a subject 1 periodically. External light including reflected light from the subject 1 is passed through a photodetector PD, an HPF3, etc., to cut its DC component and low-frequency component, thereby extracting a component corresponding to the reflected light. The output signal of the HPF3 is passed through two parallel-connected amplifiers 4 and 5 and then integrated by integral networks 6 and 7. The amplifiers 4 and 5 have adequately set different gains. When the gains of the front stages are set to mutually different values by comparators COM1 and COM2, each area can take a measurement of distance by fully utilizing a power voltage and becomes to lerant to noise, etc. Then, the distance area of the subject 1 is displayed through AND circuits AND1 and AND2, and an NOR circuit NOR, etc. Consequently, malfunction due to the low saturation point of the aplifiers, etc., is prevented.
JP12516980A 1980-09-09 1980-09-09 Distance measuring circuit Pending JPS5749906A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP12516980A JPS5749906A (en) 1980-09-09 1980-09-09 Distance measuring 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
JP12516980A JPS5749906A (en) 1980-09-09 1980-09-09 Distance measuring circuit

Publications (1)

Publication Number Publication Date
JPS5749906A true JPS5749906A (en) 1982-03-24

Family

ID=14903588

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12516980A Pending JPS5749906A (en) 1980-09-09 1980-09-09 Distance measuring circuit

Country Status (1)

Country Link
JP (1) JPS5749906A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6064283A (en) * 1983-09-19 1985-04-12 Asahi Optical Co Ltd Light emitting type distance measuring apparatus
JPS6082913A (en) * 1983-10-14 1985-05-11 Canon Inc Active type range finder
JPH05169529A (en) * 1991-12-20 1993-07-09 Asahi Chem Ind Co Ltd Manufacture of inflation film

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4813062B1 (en) * 1968-09-03 1973-04-25
JPS4888862A (en) * 1972-02-23 1973-11-21

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4813062B1 (en) * 1968-09-03 1973-04-25
JPS4888862A (en) * 1972-02-23 1973-11-21

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6064283A (en) * 1983-09-19 1985-04-12 Asahi Optical Co Ltd Light emitting type distance measuring apparatus
JPS6082913A (en) * 1983-10-14 1985-05-11 Canon Inc Active type range finder
JPH05169529A (en) * 1991-12-20 1993-07-09 Asahi Chem Ind Co Ltd Manufacture of inflation film

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