Optical disc with inhibited thermal distortion

PCT No. PCT/JP87/00343 Sec. 371 Date Mar. 4, 1988 Sec. 102(e) Date Mar. 4, 1988 PCT Filed May 28, 1987 PCT Pub. No. WO88/00755 PCT Pub. Date Jan. 28, 1988.An optical disc in which distortion due to temperature change is inhibited has a magnetic positioning disc 3 of specified diameter mounted at the...

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Bibliographic Details
Main Authors KUSAURA; AKIO, FUJISAWA; HIDEMITSU, HATTORI; MICHINOBU
Format Patent
LanguageEnglish
Published 31.10.1989
Edition4
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:PCT No. PCT/JP87/00343 Sec. 371 Date Mar. 4, 1988 Sec. 102(e) Date Mar. 4, 1988 PCT Filed May 28, 1987 PCT Pub. No. WO88/00755 PCT Pub. Date Jan. 28, 1988.An optical disc in which distortion due to temperature change is inhibited has a magnetic positioning disc 3 of specified diameter mounted at the center of the disc substrate 1 having an information recording layer 2 on a specified radial area. The positioning disc is bonded to the disc substrate by an element(s) made of a material whose thermal expansion coefficient is almost equivalent to that of the disc substrate.
Bibliography:Application Number: US19880168125