To provide an exposure device for scanning a plurality of beams that is large in size, has high degree of freedom in an image formation unit, and is applicable to a high-speed color printer.
An exposure device 1 of the present invention comprises an imaging system 9 comprising three of a first to a third glass imaging lens 23, 25 and 27 having an Abbes number ν of 60 or more, 28 or less, and 65 or less, respectively. Optical paths of laser beams L (Y, M, C and B) passing through the respective lenses cross one another with respect to the rotating axis direction of a polygon mirror of a deflector 5 between the polygon mirror and first imaging lens 23. Consequently, the machining cost is reduced, and the degree of freedom in the optical path related to a shape required for an image forming section is enhanced, and it is possible to reduce variations in a beam diameter of the laser beam at an imaging position and variations in the imaging position.
| JP3682295 | LASER BEAM MACHINING DEVICE |
| JPS536050 | OPTICAL DEFLECTOR |
| JPH08234125 | OPTICAL SCANNER |
YAMAGUCHI MASAO
TOSHIBA TEC KK
| JPS6339208U | 1988-03-14 | |||
| JPH07256926A | 1995-10-09 | |||
| JPH0353213A | 1991-03-07 | |||
| JPH1048550A | 1998-02-20 | |||
| JPH09274151A | 1997-10-21 | |||
| JPH0618802A | 1994-01-28 | |||
| JPH02272517A | 1990-11-07 |
Takakura Shigeo
Satoshi Kono
Makoto Nakamura
Yoshihiro Fukuhara
Takashi Mine
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Kocho Chojiro
Naoki Kono
Katsu Sunagawa
Morisezo Iseki
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi
Takenori Masanori