Plastic article or earthenware shaping or treating: apparatus – Means applying electrical or wave energy directly to work – Radiated energy
Patent
1997-04-18
1999-09-14
Mackey, James P.
Plastic article or earthenware shaping or treating: apparatus
Means applying electrical or wave energy directly to work
Radiated energy
21912165, 2191218, 21912184, 264400, 264482, 269 483, 269 50, 269 52, 425385, G11B 584
Patent
active
059520140
ABSTRACT:
An apparatus for forming a textured zone in a predetermined surface area on a magnetic data recording disc, which is capable of precisely controlling the position and range of the texturing zone. Bumps 4 are formed on a CSS zone on the inner peripheral side of a magnetic recording disc 1 by the use of a spindle means 6 and a laser beam bombarding means 7. The spindle means 6 is provided with a chuck mechanism 13 with opposingly confronting tapered surfaces 18a and 21a to hold a disc 1 in a centered position in alignment with the rotational axis of a spindle shaft 10. On the other hand, the laser beam bombarding means 7 has part of component parts of its optical system, from a laser energy source 34 up to an electromagnetic shutter 39, mounted on its main casing 7a, and has a reflector mirror 40 and an objective lens 41 accommodated in a movable housing 31 which is movable in the direction of its optical axis to displace a laser spot position on the surface of the disc 1 in a radial direction thereof.
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Ichikawa Hisayoshi
Ishida Takahisa
Wada Kenya
Hitachi Electronics Engineering Co. Ltd.
Mackey James P.
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