JPS6479720A - High resolution light beam scanner - Google Patents

High resolution light beam scanner

Info

Publication number
JPS6479720A
JPS6479720A JP23618587A JP23618587A JPS6479720A JP S6479720 A JPS6479720 A JP S6479720A JP 23618587 A JP23618587 A JP 23618587A JP 23618587 A JP23618587 A JP 23618587A JP S6479720 A JPS6479720 A JP S6479720A
Authority
JP
Japan
Prior art keywords
face
lens
scanned
light beam
mirror
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
JP23618587A
Other languages
Japanese (ja)
Other versions
JP2613600B2 (en
Inventor
Takaki Hisada
Yoshio Ariki
Shunichi Taguchi
Takesuke Maruyama
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP62236185A priority Critical patent/JP2613600B2/en
Publication of JPS6479720A publication Critical patent/JPS6479720A/en
Application granted granted Critical
Publication of JP2613600B2 publication Critical patent/JP2613600B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Mechanical Optical Scanning Systems (AREA)
  • Lenses (AREA)

Abstract

PURPOSE:To reduce the diameter of a scan spot by constituting an ftheta characteristic optical system, which is provided between a deflecting device and a face to be scanned, of a first lens consisting of a cylinder face having a negative power in the subscanning direction and a spherical face and a second lens consisting of a cylinder face having a negative power in the subscanning direction and a toroidal face. CONSTITUTION:The emitted light from a semiconductor laser beam source 1 is collimated by a coupling lens 2 and is reflected on a small area mirror 3 and is made incident on a face 7a to be scanned of a second lens 7. A light beam from this face 7a passes a first lens 6 and is reflected on a polygonal mirror 4 of the deflecting device and scans a face 8 to be scanned of a photosensitive drum as light beams 11a-11c. At this time, a rotation center 9 of the polygonal mirror 4 is arranged on the extension of the optical axis of an optical system having the ftheta characteristic when viewed in a section in the main scanning direction. The angle of the mirror 3 is controlled with respect to the light beam reaching the face 8 to be scanned so that optical axes of lenses 6 and 7 cross in the subscanning section direction, and the lens 2 is moved in the optical axis direction so that the spot diameter is minimized.
JP62236185A 1987-09-22 1987-09-22 High resolution light beam scanner Expired - Lifetime JP2613600B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62236185A JP2613600B2 (en) 1987-09-22 1987-09-22 High resolution light beam scanner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62236185A JP2613600B2 (en) 1987-09-22 1987-09-22 High resolution light beam scanner

Publications (2)

Publication Number Publication Date
JPS6479720A true JPS6479720A (en) 1989-03-24
JP2613600B2 JP2613600B2 (en) 1997-05-28

Family

ID=16997033

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62236185A Expired - Lifetime JP2613600B2 (en) 1987-09-22 1987-09-22 High resolution light beam scanner

Country Status (1)

Country Link
JP (1) JP2613600B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0442624U (en) * 1990-08-10 1992-04-10
JPH09251138A (en) * 1996-01-10 1997-09-22 Ricoh Co Ltd Optical scanning device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5667816A (en) * 1979-10-29 1981-06-08 Xerox Corp Spot scanning device
JPS61245129A (en) * 1985-04-22 1986-10-31 Asahi Optical Co Ltd Scanning optical system for laser printer or the like

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5667816A (en) * 1979-10-29 1981-06-08 Xerox Corp Spot scanning device
JPS61245129A (en) * 1985-04-22 1986-10-31 Asahi Optical Co Ltd Scanning optical system for laser printer or the like

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0442624U (en) * 1990-08-10 1992-04-10
JPH09251138A (en) * 1996-01-10 1997-09-22 Ricoh Co Ltd Optical scanning device

Also Published As

Publication number Publication date
JP2613600B2 (en) 1997-05-28

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