Method of manufacturing an optically readable disc record and di

Details Method of manufacturing an optically readable disc record and di Method of manufacturing an optically readable disc record and di

1987-05-19

1989-01-03

Wityshyn, Michael

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156219, 156245, 1563096, 264 23, 264219, 264248, 264250, 264293, B29C 5902, B29C 6508

Patent

active

047955112

ABSTRACT:
A disc-shaped information carrier (1) is formed by welding two injection-moulded plastics discs concentrically to each other (1A, 1B), which discs are manufactured by means of a method comprising the manufacture of a matrix (9), which matrix is formed with recesses (6) which form projections (5A, 5B) on the disc during injection-moulding and which are fused to the facing disc during welding. Said recesses are formed in the matrix by pressing an indenter pin (7) having a pointed end (8) into the matrix surface, to form locally pit-shaped recesses each surrounded by a ridge (11) of displaced material, which ridge has a volume which is substantially equal to the volume of the pit-shaped recess, so that during injection-moulding the disc is provided with a corresponding pin-shaped projection which is surrounded by a groove (12) which can receive the volume of that part of the pin which is melted during welding.

REFERENCES:
patent: 2442022 (1948-05-01), Schulz
patent: 4051218 (1977-09-01), Hotton
patent: 4564932 (1986-01-01), Lange
patent: 4647325 (1987-03-01), Bach

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