JPS5540459A - Focus adjusting method of optical system - Google Patents

Focus adjusting method of optical system

Info

Publication number
JPS5540459A
JPS5540459A JP11324678A JP11324678A JPS5540459A JP S5540459 A JPS5540459 A JP S5540459A JP 11324678 A JP11324678 A JP 11324678A JP 11324678 A JP11324678 A JP 11324678A JP S5540459 A JPS5540459 A JP S5540459A
Authority
JP
Japan
Prior art keywords
spacing
light
lens unit
change
optical system
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
JP11324678A
Other languages
Japanese (ja)
Inventor
Nobushiro Shimura
Toshiaki Anzai
Masahito Kawashima
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP11324678A priority Critical patent/JPS5540459A/en
Publication of JPS5540459A publication Critical patent/JPS5540459A/en
Pending legal-status Critical Current

Links

Landscapes

  • Dot-Matrix Printers And Others (AREA)
  • Laser Beam Printer (AREA)
  • Mechanical Optical Scanning Systems (AREA)

Abstract

PURPOSE: To prevent the change in printing width accompanied with focus adjustment by changing the spacing between each lens in the expander lens unit thereby performing focus adjustment.
CONSTITUTION: The spacing d between the lenses 61 and 62 in the expander lens unit 6 disposed between the second reflecting mirror 5 which reflects the laser light 4 having passed through a modulator 3 and a rotary mirror 8 is made adjustable. When the spacing d is made d' where the spacing d is d and where it is assumed that the magnified light 7 is parallel rays, then the light 7' is no longer parallel rays and the size of the image when it reached a projecting lens 9 differs form the one when it is out from the expander lens unit 6, thus the fous position is controlled. Hence, with the position of the projecting lens 9 being intact, the focus position is adjusted and the scanning range of light on the recording plane 10' does not change, thus the intended object is achieved.
COPYRIGHT: (C)1980,JPO&Japio
JP11324678A 1978-09-14 1978-09-14 Focus adjusting method of optical system Pending JPS5540459A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11324678A JPS5540459A (en) 1978-09-14 1978-09-14 Focus adjusting method of optical system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11324678A JPS5540459A (en) 1978-09-14 1978-09-14 Focus adjusting method of optical system

Publications (1)

Publication Number Publication Date
JPS5540459A true JPS5540459A (en) 1980-03-21

Family

ID=14607268

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11324678A Pending JPS5540459A (en) 1978-09-14 1978-09-14 Focus adjusting method of optical system

Country Status (1)

Country Link
JP (1) JPS5540459A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61234306A (en) * 1985-04-09 1986-10-18 Mitsutoyo Mfg Corp Optical measuring apparatus
JPH01101511A (en) * 1987-10-14 1989-04-19 Fuji Photo Film Co Ltd Laser light source for multiplexing
JPH02271314A (en) * 1989-04-12 1990-11-06 Canon Inc Optical scanner

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61234306A (en) * 1985-04-09 1986-10-18 Mitsutoyo Mfg Corp Optical measuring apparatus
WO1986006159A1 (en) * 1985-04-09 1986-10-23 Mitutoyo Mfg. Co., Ltd. Optical measuring instrument
JPH01101511A (en) * 1987-10-14 1989-04-19 Fuji Photo Film Co Ltd Laser light source for multiplexing
JP2631666B2 (en) * 1987-10-14 1997-07-16 富士写真フイルム株式会社 Laser light source device for multiplexing
JPH02271314A (en) * 1989-04-12 1990-11-06 Canon Inc Optical scanner

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