Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Limited to treatment of surface or coated surface
Patent
1998-12-02
2000-08-15
Silverman, Stanley S.
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Limited to treatment of surface or coated surface
430321, 264400, 264482, 356363, 356373, 356375, 21912168, 21912169, 21912175, 21912182, 216 24, 216 39, 216 65, 216 85, 216 97, 3461076, B29C 5916, H05B 600
Patent
active
061031771
ABSTRACT:
A mastering apparatus for recording optical information onto a glass master 6, includes an objective lens 3, a slider 5 for controlling the movement of the objective lens 3 in the tracking direction, a turn table 7 for rotating the glass master 6, a spindle motor 8 for controlling the rotation of the turn table 7, a positioning beam generator 9, a positioning beam detector 10 for detecting a positioning beam reflected and/or diffracted by positioning units 16 and 17 and a slider controller 11 for moving the slider 5 based on the result of reception of a beam at the positioning beam detector 10. The positioning unit 16 is mounted on the vicinity of the objective lens 3, and the positioning unit 17 is mounted on the upper surface of a spindle stationary portion 13. Since the position of the positioning unit 17 is always stable, relative positional deviation between the positioning units 16 and 17 can be accurately detected by detecting the beam diffracted by the positioning units 16 and 17.
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Kikuiri Nobutaka
Nishida Jun
Colaianni Michael P.
Kabushiki Kaisha Toshiba
Silverman Stanley S.
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