JPS6478207A - Focus detecting device - Google Patents

Focus detecting device

Info

Publication number
JPS6478207A
JPS6478207A JP23489587A JP23489587A JPS6478207A JP S6478207 A JPS6478207 A JP S6478207A JP 23489587 A JP23489587 A JP 23489587A JP 23489587 A JP23489587 A JP 23489587A JP S6478207 A JPS6478207 A JP S6478207A
Authority
JP
Japan
Prior art keywords
focus detection
focus
arithmetic
outputs
arithmetic means
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.)
Granted
Application number
JP23489587A
Other languages
Japanese (ja)
Other versions
JP2762440B2 (en
Inventor
Yasuhisa Sato
Keiji Otaka
Takashi Koyama
Akira Akashi
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 JP62234895A priority Critical patent/JP2762440B2/en
Publication of JPS6478207A publication Critical patent/JPS6478207A/en
Application granted granted Critical
Publication of JP2762440B2 publication Critical patent/JP2762440B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To decrease bodies which cause a failure in focus detection or focus misdetection by providing a means which switches the outputs of 1st and 2nd focus detection systems and an arithmetic means for focus detection, switching the focus detection systems which have different base lines and performing the focus detecting operation in two stages. CONSTITUTION:One of the outputs of the 1st focus detection system 18 and the 2nd focus detection system 19 is selected by the switching means 20 and inputted to the arithmetic means 21. The switching means 20 is controlled the arithmetic means 21 through a driver 22. The arithmetic means 21 detects the focus state of a photographic lens 11 by arithmetic operation and drives a lens driving motor 25 through a driving control circuit 24 to move the photographic lens 11 to a focusing position. In normal operation, the switching means 20 is switched to the side of the 1st focus detection system 18 to input the outputs of photoelectric converting element arrays 16a and 16b to the arithmetic means 21, and the lens driving is performed through the driving control circuit 24 according to the arithmetic result. Consequently, bodies which cause a focus detection failure or focus misdetection are decreased.
JP62234895A 1987-09-21 1987-09-21 Focus detection device Expired - Fee Related JP2762440B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62234895A JP2762440B2 (en) 1987-09-21 1987-09-21 Focus detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62234895A JP2762440B2 (en) 1987-09-21 1987-09-21 Focus detection device

Publications (2)

Publication Number Publication Date
JPS6478207A true JPS6478207A (en) 1989-03-23
JP2762440B2 JP2762440B2 (en) 1998-06-04

Family

ID=16977988

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62234895A Expired - Fee Related JP2762440B2 (en) 1987-09-21 1987-09-21 Focus detection device

Country Status (1)

Country Link
JP (1) JP2762440B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0680322U (en) * 1993-04-15 1994-11-08 株式会社平山製作所 Underfloor outlet box screwing structure of device support plate to bottom plate

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61295520A (en) * 1985-06-24 1986-12-26 Minolta Camera Co Ltd Focus detecting device
JPS62186214A (en) * 1986-02-10 1987-08-14 Olympus Optical Co Ltd Automatic focus adjuster

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61295520A (en) * 1985-06-24 1986-12-26 Minolta Camera Co Ltd Focus detecting device
JPS62186214A (en) * 1986-02-10 1987-08-14 Olympus Optical Co Ltd Automatic focus adjuster

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0680322U (en) * 1993-04-15 1994-11-08 株式会社平山製作所 Underfloor outlet box screwing structure of device support plate to bottom plate

Also Published As

Publication number Publication date
JP2762440B2 (en) 1998-06-04

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees