JPS56109313A - Light beam scanner - Google Patents

Light beam scanner

Info

Publication number
JPS56109313A
JPS56109313A JP1269880A JP1269880A JPS56109313A JP S56109313 A JPS56109313 A JP S56109313A JP 1269880 A JP1269880 A JP 1269880A JP 1269880 A JP1269880 A JP 1269880A JP S56109313 A JPS56109313 A JP S56109313A
Authority
JP
Japan
Prior art keywords
image
lens
light beam
axis
scanning
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
JP1269880A
Other languages
Japanese (ja)
Inventor
Masamichi Tatsuoka
Takao Tsuji
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 JP1269880A priority Critical patent/JPS56109313A/en
Publication of JPS56109313A publication Critical patent/JPS56109313A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • G02B27/0031—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration for scanning purposes

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Lenses (AREA)

Abstract

PURPOSE:To keep the spot intensity of a light beam nearly constant by setting a distortion aberration coefficient of an image-formation optical system to >=2/3 and <=1.13, and by prolonging the time of a modulated signal from a modulation control means when a light beam travels at a position away from the optical axis of the image-formation optical system. CONSTITUTION:Image-forming lens 15 consists of three elements 20, 21 and 22 in three groups. In the scanning system of 200mm. in scanning width, concave lens 20 is located 40mm. away from surface S of rotary polygon mirror 13. Lenses 21 and 22 are both convex ones and the interval between convex lens 22 and photosensitive material 16 is 403.3mm.. The constitution of image-forming lens 15 is expressed by formula I (R is a radius of curvature, D is an air interval on the axis or thickness on the axis, and N is a refractive index). The focal length of lens 15 is 300mm. and its F number is 60. A light beam modulated usually by modulator 12 and deflected by rotary polygon mirror 13 passes through lens 15 to form an image, which scans on photosensitive material 16 as shown by arrow 17; the dot width on the scanning surface is equal and its spot intensity never lowers at the circumference of the surface to be scanned.
JP1269880A 1980-02-05 1980-02-05 Light beam scanner Pending JPS56109313A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1269880A JPS56109313A (en) 1980-02-05 1980-02-05 Light beam scanner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1269880A JPS56109313A (en) 1980-02-05 1980-02-05 Light beam scanner

Publications (1)

Publication Number Publication Date
JPS56109313A true JPS56109313A (en) 1981-08-29

Family

ID=11812602

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1269880A Pending JPS56109313A (en) 1980-02-05 1980-02-05 Light beam scanner

Country Status (1)

Country Link
JP (1) JPS56109313A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS597918A (en) * 1982-07-06 1984-01-17 Asahi Optical Co Ltd F-theta lens system
JPS5933423A (en) * 1982-08-18 1984-02-23 Fujitsu Ltd Scanning system
EP0433953A2 (en) * 1989-12-20 1991-06-26 Canon Kabushiki Kaisha F-theta lens and scanning optical system using the same
WO2014071741A1 (en) * 2012-11-09 2014-05-15 珠海艾派克微电子有限公司 Laser scanning method, laser scanning apparatus and imaging device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS597918A (en) * 1982-07-06 1984-01-17 Asahi Optical Co Ltd F-theta lens system
JPS6151289B2 (en) * 1982-07-06 1986-11-08 Asahi Optical Co Ltd
JPS5933423A (en) * 1982-08-18 1984-02-23 Fujitsu Ltd Scanning system
EP0433953A2 (en) * 1989-12-20 1991-06-26 Canon Kabushiki Kaisha F-theta lens and scanning optical system using the same
WO2014071741A1 (en) * 2012-11-09 2014-05-15 珠海艾派克微电子有限公司 Laser scanning method, laser scanning apparatus and imaging device
CN103809288A (en) * 2012-11-09 2014-05-21 珠海艾派克微电子有限公司 Laser scanning method, device and imaging equipment

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