JPS6332508A - Projecting system for automatic focus detection - Google Patents

Projecting system for automatic focus detection

Info

Publication number
JPS6332508A
JPS6332508A JP17507686A JP17507686A JPS6332508A JP S6332508 A JPS6332508 A JP S6332508A JP 17507686 A JP17507686 A JP 17507686A JP 17507686 A JP17507686 A JP 17507686A JP S6332508 A JPS6332508 A JP S6332508A
Authority
JP
Japan
Prior art keywords
lens
distance
different
pattern image
focal positions
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.)
Withdrawn
Application number
JP17507686A
Other languages
Japanese (ja)
Other versions
JPH0713699B2 (en
Inventor
Takashi Koyama
Keiji Otaka
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 JP61175076A priority Critical patent/JPH0713699B2/en
Publication of JPS6332508A publication Critical patent/JPS6332508A/en
Priority claimed from US07/382,029 external-priority patent/US4907026A/en
Publication of JPH0713699B2 publication Critical patent/JPH0713699B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE: To project a distinct pattern image within a range extending from a long distance to the closest focusing distance, by constituting a projection lens of plural lenses whose optical axes have been shifted and whose focal positions are different, respectively.
CONSTITUTION: A pattern 3 which has been illuminated by a light source 4 is projected into two directions in which object distances are different, by lens parts 23, 24 in which two focal positions are different, of a projection lens 2. For instance, the lens part 23 forms a focused pattern image on an object, of a long distance in the direction as indicated with a full line, and the lens part 24 forms a focused pattern image on an object, of a short distance in the direction as indicated with a dotted line being different from an object distance range by the lens part 23. In this way, an indistinct difference of the pattern image caused by a variation of the object distance at the time when the focal positions of the two lens parts 23, 24 have been set to the same is improved.
COPYRIGHT: (C)1988,JPO&Japio
JP61175076A 1986-07-25 1986-07-25 Projection system for automatic focus detection Expired - Fee Related JPH0713699B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61175076A JPH0713699B2 (en) 1986-07-25 1986-07-25 Projection system for automatic focus detection

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP61175076A JPH0713699B2 (en) 1986-07-25 1986-07-25 Projection system for automatic focus detection
US07/382,029 US4907026A (en) 1986-04-21 1989-07-19 Light projection system for automatic focus detection

Publications (2)

Publication Number Publication Date
JPS6332508A true JPS6332508A (en) 1988-02-12
JPH0713699B2 JPH0713699B2 (en) 1995-02-15

Family

ID=15989812

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61175076A Expired - Fee Related JPH0713699B2 (en) 1986-07-25 1986-07-25 Projection system for automatic focus detection

Country Status (1)

Country Link
JP (1) JPH0713699B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02101412A (en) * 1988-10-11 1990-04-13 Canon Inc Light projecting system for focus detection
JPH03143A (en) * 1989-05-25 1991-01-07 Nippon Steel Corp Removing device for ferromagnetic metallic piece
JPH0398655A (en) * 1989-09-12 1991-04-24 Nippon Steel Corp Apparatus for removing metal piece
JPH0452510A (en) * 1990-06-20 1992-02-20 Canon Inc Measuring apparatus of distance
JP2013197109A (en) * 2012-03-15 2013-09-30 Omron Corp Reflection type photoelectric sensor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61138222A (en) * 1984-12-11 1986-06-25 Minolta Camera Co Ltd Illuminating device of camera having t.t.l. focus detector
JPS6267507A (en) * 1985-09-20 1987-03-27 Hitachi Ltd Automatic focusing device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61138222A (en) * 1984-12-11 1986-06-25 Minolta Camera Co Ltd Illuminating device of camera having t.t.l. focus detector
JPS6267507A (en) * 1985-09-20 1987-03-27 Hitachi Ltd Automatic focusing device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02101412A (en) * 1988-10-11 1990-04-13 Canon Inc Light projecting system for focus detection
JPH03143A (en) * 1989-05-25 1991-01-07 Nippon Steel Corp Removing device for ferromagnetic metallic piece
JPH0398655A (en) * 1989-09-12 1991-04-24 Nippon Steel Corp Apparatus for removing metal piece
JPH0452510A (en) * 1990-06-20 1992-02-20 Canon Inc Measuring apparatus of distance
JP2013197109A (en) * 2012-03-15 2013-09-30 Omron Corp Reflection type photoelectric sensor

Also Published As

Publication number Publication date
JPH0713699B2 (en) 1995-02-15

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Legal Events

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