JPS5749905A - Distance measuring circuit - Google Patents

Distance measuring circuit

Info

Publication number
JPS5749905A
JPS5749905A JP55125168A JP12516880A JPS5749905A JP S5749905 A JPS5749905 A JP S5749905A JP 55125168 A JP55125168 A JP 55125168A JP 12516880 A JP12516880 A JP 12516880A JP S5749905 A JPS5749905 A JP S5749905A
Authority
JP
Japan
Prior art keywords
subject
distance
light
reflected light
hpf3
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
JP55125168A
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 JP55125168A priority Critical patent/JPS5749905A/en
Priority to US06/299,291 priority patent/US4479706A/en
Priority to DE3135710A priority patent/DE3135710A1/en
Publication of JPS5749905A publication Critical patent/JPS5749905A/en
Priority to US06/599,772 priority patent/US4533227A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G01S17/10—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/30—Systems for automatic generation of focusing signals using parallactic triangle with a base line
    • G02B7/32—Systems for automatic generation of focusing signals using parallactic triangle with a base line using active means, e.g. light emitter

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Optics & Photonics (AREA)
  • Measurement Of Optical Distance (AREA)
  • Automatic Focus Adjustment (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

PURPOSE:To take a measurement of distance precisely even in case of disturbing light and noise, by extracting only the part of a photodetection signal, which corresponds to projection, by a semiconductor switch and by integrating or averaging it. CONSTITUTION:A light-emitting diode projector LED1 projects light to a subject 1 periodically. External light including reflected light from the subject 1 is passed through a photodetecting element PD, a sensor amplifier 2 and an HPF3 to cut its DC component and low-frequency component, thus extracting a signal corresponding to the reflected light from the subject 1. The output signal of the HPF3 is passed through an amplifier 4 and integrated by an integral network 5. An analog switch A1 extracts only the part of the subject reflected light. The output of the integral network 5 is latched by an FF1 and an FF2 through comparators COM1 and COM2. Then, an LED2 for the short distance of the subject 1, an LED3 for the intermediate distance, and an LED4 for the long distance turn on selectively through AND circuits AND1 and AND2, and an NOR circuit NOR, thus performing distance display. Consequently, a high-precision measurement of distance is taken by the said constitution.
JP55125168A 1980-09-09 1980-09-09 Distance measuring circuit Pending JPS5749905A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP55125168A JPS5749905A (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
JP55125168A JPS5749905A (en) 1980-09-09 1980-09-09 Distance measuring circuit

Publications (1)

Publication Number Publication Date
JPS5749905A true JPS5749905A (en) 1982-03-24

Family

ID=14903560

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55125168A Pending JPS5749905A (en) 1980-09-09 1980-09-09 Distance measuring circuit

Country Status (1)

Country Link
JP (1) JPS5749905A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57187676A (en) * 1981-05-15 1982-11-18 Secoh Giken Inc Measuring device for distance

Citations (1)

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

Patent Citations (1)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57187676A (en) * 1981-05-15 1982-11-18 Secoh Giken Inc Measuring device for distance

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