JPS6476020A - Optical device for image forming device - Google Patents
Optical device for image forming deviceInfo
- Publication number
- JPS6476020A JPS6476020A JP23234587A JP23234587A JPS6476020A JP S6476020 A JPS6476020 A JP S6476020A JP 23234587 A JP23234587 A JP 23234587A JP 23234587 A JP23234587 A JP 23234587A JP S6476020 A JPS6476020 A JP S6476020A
- Authority
- JP
- Japan
- Prior art keywords
- ftheta
- condensing power
- image carrier
- image
- main 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.)
- Granted
Links
Landscapes
- Mechanical Optical Scanning Systems (AREA)
- Lenses (AREA)
Abstract
PURPOSE:To reduce the variation of the image height on an image carrier caused by the deviation of an image surface and to improve an image quality by setting the ftheta lenses whose condensing power in a subscanning direction is larger than the condensing power in a main scanning direction on the side of a scanning mirror. CONSTITUTION:The plural Ftheta lenses 40a, 40b which have a larger condensing power in the subscanning direction vertical to the main scanning direction than condensing power of the main scanning direction are set in an ftheta lens system. The condensing power in the subscanning direction of the ftheta lens 40a on the side of the scanning mirror 34 of the ftheta lens system consisting of the plural lenses 40a, 40b is larger than the condensing power in the main scanning direction; therefore, the height of the laser beam passing ftheta lens 40b on the side of the image carrier 38 is reduced and the angle of incidence of the laser beam from the ftheta lens system to the image carrier 38 is reduced. The variation on the subscanning direction of the laser beam on the image carrier 38 is reduced even if the image carrier 38 surface makes the deviation, and the image quality is improved.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62232345A JP2610274B2 (en) | 1987-09-18 | 1987-09-18 | Optical device in image forming apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62232345A JP2610274B2 (en) | 1987-09-18 | 1987-09-18 | Optical device in image forming apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6476020A true JPS6476020A (en) | 1989-03-22 |
JP2610274B2 JP2610274B2 (en) | 1997-05-14 |
Family
ID=16937751
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62232345A Expired - Lifetime JP2610274B2 (en) | 1987-09-18 | 1987-09-18 | Optical device in image forming apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2610274B2 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5915219A (en) * | 1982-07-16 | 1984-01-26 | Minolta Camera Co Ltd | Light beam scanner |
JPS6128918A (en) * | 1984-07-20 | 1986-02-08 | Fuji Xerox Co Ltd | Laser beam scanning device |
JPS62172317A (en) * | 1986-01-24 | 1987-07-29 | Ricoh Co Ltd | Scanning optical system having face inclination correcting function |
-
1987
- 1987-09-18 JP JP62232345A patent/JP2610274B2/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5915219A (en) * | 1982-07-16 | 1984-01-26 | Minolta Camera Co Ltd | Light beam scanner |
JPS6128918A (en) * | 1984-07-20 | 1986-02-08 | Fuji Xerox Co Ltd | Laser beam scanning device |
JPS62172317A (en) * | 1986-01-24 | 1987-07-29 | Ricoh Co Ltd | Scanning optical system having face inclination correcting function |
Also Published As
Publication number | Publication date |
---|---|
JP2610274B2 (en) | 1997-05-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term | ||
FPAY | Renewal fee payment |
Free format text: PAYMENT UNTIL: 20080213 Year of fee payment: 11 |