JPS55101915A - Range finder type focus detector - Google Patents

Range finder type focus detector

Info

Publication number
JPS55101915A
JPS55101915A JP1268580A JP1268580A JPS55101915A JP S55101915 A JPS55101915 A JP S55101915A JP 1268580 A JP1268580 A JP 1268580A JP 1268580 A JP1268580 A JP 1268580A JP S55101915 A JPS55101915 A JP S55101915A
Authority
JP
Japan
Prior art keywords
curvature
lens
luminous flux
photo detecting
periphery becomes
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
JP1268580A
Other languages
Japanese (ja)
Inventor
Hideo Yokota
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP1268580A priority Critical patent/JPS55101915A/en
Publication of JPS55101915A publication Critical patent/JPS55101915A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To achieve the extension of the maximum measurable distance, enhance distance measurement accuracy, and achieve lighter weight and smaller size by using the aspherical lens in which the curvature on the periphery becomes subsequently smaller than the curvature at the face vertex.
CONSTITUTION: The luminous flux emitted from a light emitting diode 1 of a narrow wavelength region to the extent of not generating chromatic aberrations by lens is refracted and converged by the projecting lens 2 provided with the aspheric surface in which the curvature of the periphery becomes subsequently smaller than the curvature at the lens face vertex. This luminous flux is radiated to the surface of the subject 7. The luminous flux scattered and reflected by the subject 7 is condensed to the photo detecting surface of a photoelectric conversion means 3 by the photo detecting lens 6 provided with the aspheric surface in which the curvature of the periphery becomes subsequently smaller than the curvature of the lens face vertex. When the light source 1 is moved, the centroid position of the reflected images incident to the photo detecting surface moves and the output electric signals of the elements 4 and 5 change. By utilizing this signal as the distance measuring signal, the distance measurement is accomplished.
COPYRIGHT: (C)1980,JPO&Japio
JP1268580A 1980-02-05 1980-02-05 Range finder type focus detector Pending JPS55101915A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1268580A JPS55101915A (en) 1980-02-05 1980-02-05 Range finder type focus detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1268580A JPS55101915A (en) 1980-02-05 1980-02-05 Range finder type focus detector

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP15337078A Division JPS5588001A (en) 1978-12-11 1978-12-11 Distance measuring optical system

Publications (1)

Publication Number Publication Date
JPS55101915A true JPS55101915A (en) 1980-08-04

Family

ID=11812224

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1268580A Pending JPS55101915A (en) 1980-02-05 1980-02-05 Range finder type focus detector

Country Status (1)

Country Link
JP (1) JPS55101915A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5975209A (en) * 1982-10-22 1984-04-27 Asahi Optical Co Ltd Optical system of focus position detector

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5047488A (en) * 1973-08-31 1975-04-26

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5047488A (en) * 1973-08-31 1975-04-26

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5975209A (en) * 1982-10-22 1984-04-27 Asahi Optical Co Ltd Optical system of focus position detector

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