Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-01-02
1986-12-23
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
33125C, H01J 314, H01J 516
Patent
active
046314032
ABSTRACT:
The scanning unit which is movable along the scale member comprises signal-generating means, which are accommodated in one or more covering hoods. Each covering hood has an annular boundary surface facing the scale member and is provided at said boundary surface with an annular seal which consists of elastomeric material and is in sealing contact with the scale member under initial compressive stress throughout the peripheral extent of the boundary surface. The covering hood and the scale member thus define between them a measuring chamber in which the atmospheric conditions are favorable for an accurate measurement. As the scanning unit is moved along the scale member, the measuring chamber will always be disposed at a portion of the scale member in which the surface of the scale member has just been cleaned by the sliding contact between the annular seal and the scale member.
REFERENCES:
patent: 3816003 (1974-06-01), Litke
patent: 4031595 (1977-06-01), Welker
patent: 4376543 (1983-03-01), Sakagami
patent: 4400890 (1983-08-01), Ohkubo et al.
patent: 4564294 (1986-01-01), Ernst
Rieder Heinz
Schwaiger Max
Kelman Kurt
Nelms David C.
Oen William L.
RSF Elektronik Gesellschaft M.B.H.
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