Method of providing a substrate with an optically readable infor

Details Method of providing a substrate with an optically readable infor Method of providing a substrate with an optically readable infor

1985-09-23

1987-06-02

Silbaugh, Jan H.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

1562722, 1563082, 264 13, 264 22, 264106, 264259, B29D 1700

Patent

active

046700773

ABSTRACT:
The invention relates to a method of providing a substrate with a centered optically detectable structure, such as a servo structure on a transport substrate of an optical information disc. The method uses a mould (1) having a base (1A) carrying a mould structure (2) which is covered with a reproduction layer (4) of a transparent radiation-curable resin, which after curing is detached from the mould together with the substrate. In its center the base (1A) of the mould is provided with base-centering means (7) relative to which the mould structure is centered accurately. Before it is placed on the mould a substrate (3) is provided with a disc hub (8) comprising separate disc-centering means (9) which serve to center the finished information disc (17) on the drive spindle (27) of a drive apparatus. The intermediate product comprising the substrate (3) and the disc hub (8) is centered on the base (1a) of the mould by cooperation between the base-centering means (17) and the disc-centering means (9). This may be effected by the use of an auxiliary centering means (12) which is in contact with a wall (14) of a central centering hole (11) in the disc hub (8) and with a wall (13) of a central centering recess (10) in the base (1A). Thus, the reproduction layer is cured in the position which is thus centered without any play, after which the substrate together with the disc hub is detached from the mould without the centering of the servo track on the substrate being disturbed.

REFERENCES:
patent: 4224648 (1980-09-01), Roling
patent: 4312823 (1982-01-01), Kraakman et al.
patent: 4435343 (1984-03-01), Ando et al.
patent: 4527971 (1985-07-01), Strausfeld et al.

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