Radiation-sensitive record disc

Details Radiation-sensitive record disc Radiation-sensitive record disc

1983-01-24

1985-03-12

Hartary, Joseph W.

Recorders

Record receivers and/or driving means therefor

Disc

346 76L, 369284, G01D 1532

Patent

active

045048428

ABSTRACT:
A radiation-sensitive record disc having a first substrate and a second substrate, coaxially positioned and spaced from the first substrate. The second substrate has an inner vent hole perpendicular to its surface which provides fluid communication between the space and the outer surface to the substrate. A pressure equilibrium housing is coaxially provided on the outer surface of the second substrate in communication with the vent hold. This housing has a recess on its inner surface adjacent the outer surface of the second substrate so as to form a cavity. An expansible membrane is provided in the cavity for receiving, through the vent hole, the internal pressure which exists in the air space. This cavity also contains an outer vent hole, on its outer surface, to provide equilibrium between the pressure within the air space and the surrounding air so as to absorb the change of intended pressure within the air space.

REFERENCES:
patent: 3930260 (1975-12-01), Sicking
patent: 4038663 (1977-07-01), Day
patent: 4074282 (1978-02-01), Balas
patent: 4331966 (1982-05-01), Moe

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