Dainippon Screen Mfg. Co., Ltd.

Dainippon Screen Manufacturing Co., Ltd.

Yasuyuki Wada

Eiichi Tamaki

Masahide Okazaki

Shigeaki Shimazu

Kenji Endo

Takeshi Kageyama

Yoshio Kurata

Takumi Yoshida

Akira Kuwabara

Hideaki Ogawa

An optical beam scanning system for scanning photosensitive material (1) comprises a laser (201), a beam splitter (204) for producing multibeams (LB.sub.a, LB.sub.b), AOM's (207a, 207b), a multibeam adjuster (300) for turning the multibeams to intersect each other at a prescribed point (P.sub.C), a horizontal expander (211), an AOD (213), a vertical expander (214), a deflection direction adjuster (400) for rotating a deflection direction of the multibeams, and a variable focusing mechanism (500) comprising a plurality of object lenses (501-504). A pixel pitch and a spot diameter on the photosensitive material can be changed separately from each other by exchanging the object lenses and by adjusting an angle of intersection of multibeams (B.sub.a, B.sub.b) by means of the multibeam adjuster. Cylindrical lenses of the horizontal and vertical expanders are so positioned that they compensate a cylindrical lensing effect of the AOD.

Optical beam scanning system

A laser exposure system for use in scanning and recording images, the system comprising subdividing the laser beam from the laser source into several parallel traces of laser beams; modulating the laser beams individually in response to the image signals be means of a multi-channel optical modulator; directing the modulated laser beams through a first mirror and a second mirror so as to enable the laser beams from the second mirror to be in parallel with the reference plane with respect to the sub-scanning direction; varying the distance between the modulator and the first mirror; and adjusting the angles of the first and second mirrors to the reference plane so that a possible decline of the laser beams in the sub-scanning direction is compensated.

Laser exposure apparatus

A laser exposure system for use in scanning and recording images, the system comprising subdividing the laser beam from the laser source into several parallel traces of laser beams; modulating the laser beams individually in response to the image signals by means of a multi-channel optical modulator; directing the modulated laser beams through a first mirror and a second mirror so as to enable the laser beams from the second mirror to be in parallel with the reference plane with respect to the sub-scanning direction; varying the distance between the modulator and the first mirror; and adjusting the angles of the first and second mirrors to the reference plane so that a possible decline of the laser beams in the subscanning direction is compensated.

A device for fitting and adjusting an encoder comprising a first inclined plate and a second inclined plate joined together rotatably between an encoder fitting surface and a fitting flange, a joined surface between the two inclined plates being slightly inclined to a surface orthomic to the axis of a rotation shaft while remaining surfaces on the opposite side of each plate being orthogonal to the axis, so that the rotation shaft of a rotatable body is in parallel to a rotations shaft of the encoder by adjustment of either plate or both.

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Osaka, Japan

Yasuyuki Wada