Integrated type optical pickup having packaging with gas-tight s

Details Integrated type optical pickup having packaging with gas-tight s Integrated type optical pickup having packaging with gas-tight s

1996-05-01

1998-07-21

Le, Que

Radiant energy

Photocells; circuits and apparatus

Housings

250216, 257433, 369 4414, H01J 502

Patent

active

057838186

ABSTRACT:
In an optical pickup, an optical guide member is provided in an optical path of light from a light source, and has a plurality of inclined surfaces inclined with respect to a light beam emitted from the light source. A light-receiving element is provided for receiving light and for converting the received light into an electrical signal. The optical guide member and the light-receiving element are contained in a packaging member. The light beam from the light source is reflected by the plurality of inclined surfaces of the optical guide member, and then are directed to a recording medium. The reflected light from the recording medium is directed to the light-receiving element. At least one of dry air and inert gas such as nitrogen gas is charged in the interior of the packaging member at a pressure of 0.5 atm to 1.5 atm, thereby preventing the optical characteristics from being degraded.

REFERENCES:
patent: 3737667 (1973-06-01), Babb et al.
patent: 4788421 (1988-11-01), Ogawa et al.
patent: 5198916 (1993-03-01), Kim
patent: 5604606 (1997-02-01), Miyashita et al.

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