Photoelectric sensor assembly with transparent housing an integrally molded lens
First Claim
1. A through beam photoelectric sensor assembly comprising:
- a molded transparent plastic housing comprising a chamber open to one side of said housing, a focusing lens portion integrally molded in a wall of said housing defining said chamber, said wall being opposite said open side, and a mounting block portion extending away from said chamber;
a circuit board positioned in said chamber at said open side, said circuit board comprising wiring terminals projecting from one surface of said board and a photoelectric device on an opposite surface of said board, said photoelectric device being disposed within said chamber and facing said lens portion;
a molded plastic cover overlying said open side of said housing and said circuit board, said cover comprising openings for said wiring terminals and a clamp portion extending therefrom substantially coextensive with and spaced from said mounting block portion;
aligned holes in said mounting block portion and said clamp portion; and
fastener means extending through respective said aligned holes for contemporaneously securing said cover to said housing and clamping said sensor assembly to a mounting member.
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Accused Products
Abstract
A low cost assembly comprising only three major components: a circuit board assembly, a molded plastic housing and a molded plastic cover. The plastic parts are transparent polycarbonate (natural "Lexan") wherein the housing has an integrally molded optical quality lens. Mounting features are integrally molded on the housing and cover. The circuit board assembly uses a common board, trace pattern and terminals and can be either a source or detector by appropriate selection of electronic components mounted to the board. A plurality of rounded bosses on the housing and larger round recesses in edges of the circuit board provide a light interference fit between housing and board to firmly hold the board in place and provide correct orientation of the board relative to the housing. The board may be readily removed and replaced for field repair of the sensor.
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Citations
9 Claims
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1. A through beam photoelectric sensor assembly comprising:
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a molded transparent plastic housing comprising a chamber open to one side of said housing, a focusing lens portion integrally molded in a wall of said housing defining said chamber, said wall being opposite said open side, and a mounting block portion extending away from said chamber; a circuit board positioned in said chamber at said open side, said circuit board comprising wiring terminals projecting from one surface of said board and a photoelectric device on an opposite surface of said board, said photoelectric device being disposed within said chamber and facing said lens portion; a molded plastic cover overlying said open side of said housing and said circuit board, said cover comprising openings for said wiring terminals and a clamp portion extending therefrom substantially coextensive with and spaced from said mounting block portion; aligned holes in said mounting block portion and said clamp portion; and fastener means extending through respective said aligned holes for contemporaneously securing said cover to said housing and clamping said sensor assembly to a mounting member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification