Illumination type keytop

Details Illumination type keytop Illumination type keytop

1990-02-16

1991-07-30

Lazarus, Ira S.

Illumination

With switch plate or socket

362 29, 362293, 362351, F21Q 300

Patent

active

050364405

ABSTRACT:
An illumination type keytop is disclosed, in which a transmitted light restricting member is disposed opposite to a display portion formed in a part of a light intercepting layer and a colored and transparent filter member is disposed on the rear side thereof so that the display portion can be illuminated with light having a high directivity, which has passed through the transmitted light restricting member, at the illumination in the night, etc.

REFERENCES:
patent: 2931117 (1960-04-01), Bosworth et al.
patent: 3076178 (1963-01-01), Hastings
patent: 4688156 (1987-08-01), Suzuki et al.
patent: 4758701 (1988-04-01), Nagel
patent: 4845595 (1989-07-01), Fujii et al.
patent: 4877308 (1989-10-01), Okuno et al.

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