Radiant energy – Photocells; circuits and apparatus – Housings
Patent
1988-02-26
1989-06-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Housings
H01J 502
Patent
active
048411442
ABSTRACT:
A dust-proof tube for a photosensor including of a cylindrical portion having a thick wall and substantially the same length as that of the photosensor, the inner diameter of the cylindrical portion being substantially equal to the outer diameter of the photosensor so that the cylindrical portion can receive the photosensor sealingly, and a frustum portion integrally formed with the cylindrical portion and extending from the end of the cylindrical portion, the cylindrical portion and the frustum portion being made of elastic material.
REFERENCES:
patent: 2675488 (1954-04-01), Bickley
patent: 2688099 (1954-08-01), Bickley
patent: 3235739 (1966-02-01), Rottman
patent: 3433967 (1969-03-01), Bernheim
patent: 3536831 (1968-09-01), Kanemaki et al.
patent: 3557376 (1971-01-01), Senyk
patent: 3922557 (1975-11-01), Carnes, Jr.
patent: 4384303 (1983-05-01), Brenke et al.
Emori Hiroshi
Goi Kouichi
Sato Daiki
Laurel Bank Machines Co. Ltd.
Nelms David C.
Oen William
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