JPS57147607A - Zone detecting device - Google Patents

Zone detecting device

Info

Publication number
JPS57147607A
JPS57147607A JP3356381A JP3356381A JPS57147607A JP S57147607 A JPS57147607 A JP S57147607A JP 3356381 A JP3356381 A JP 3356381A JP 3356381 A JP3356381 A JP 3356381A JP S57147607 A JPS57147607 A JP S57147607A
Authority
JP
Japan
Prior art keywords
spc
photodetector
photodetecting
detection range
lens
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
JP3356381A
Other languages
Japanese (ja)
Inventor
Masahiko Ogawa
Shuichi Tamura
Mutsuhide Matsuda
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 JP3356381A priority Critical patent/JPS57147607A/en
Publication of JPS57147607A publication Critical patent/JPS57147607A/en
Pending legal-status Critical Current

Links

Classifications

    • 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)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To extend the detection range of a photodetecting means for the projection range of a light projecting means to the side of a shorter distance, by fixing projecting and photodetecting means a prescribed base line length apart from each other and detecting the reflection light due to a material of the light projected from the projecting means by the photodetecting means. CONSTITUTION:A projector LED and a photodetector SPC' are combined, and a point C on the photodetecting face of the photodetector SPC' is matched to the optical axis of a lens L2 for photodetection. In this case, a detection range B2 of the photodetecting means consisting of the photodetector SPC' and the lens L2 is extended to the side of the projecting means, namely, the side of a shorter distance in comparison with a detection range B1 of the photodetecting means consisting of a photodetector SPC and the lens L2. When the projector LED and the photodetector SPC' are combined and used, a short distance zone signal is obtained accurately in the range of distances (a)-(d). That is, the detection error is reduced, and the detection range as the short distance zone is extended to the side of a shorter distance.
JP3356381A 1981-03-09 1981-03-09 Zone detecting device Pending JPS57147607A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3356381A JPS57147607A (en) 1981-03-09 1981-03-09 Zone detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3356381A JPS57147607A (en) 1981-03-09 1981-03-09 Zone detecting device

Publications (1)

Publication Number Publication Date
JPS57147607A true JPS57147607A (en) 1982-09-11

Family

ID=12390010

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3356381A Pending JPS57147607A (en) 1981-03-09 1981-03-09 Zone detecting device

Country Status (1)

Country Link
JP (1) JPS57147607A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0523940U (en) * 1991-06-17 1993-03-30 伊藤喜オールスチール株式会社 Drawer support structure for table etc.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0523940U (en) * 1991-06-17 1993-03-30 伊藤喜オールスチール株式会社 Drawer support structure for table etc.

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