Compact lamp unit and socket

Details Compact lamp unit and socket Compact lamp unit and socket

1980-10-29

1982-03-16

McGlynn, Joseph H.

Geometrical instruments

339 75R, H01R 1362

Patent

active

043197965

ABSTRACT:
A compact lamp unit and associated socket for use in a projection system such as a slide projector, microfilm viewer, and so forth. The lamp unit includes a reflector molded from a plastic material and an electric lamp secured within the reflector. In order to decrease the axial dimension of the reflector and to avoid the use of pin connectors, electrical contacts for the lamp are pressed into recesses formed in the outer surface of the reflector. The reflector includes an opening at its apex through which electrical leads from the lamp extend outwardly of the reflector. The electrical leads are secured to the contacts by being forced into the recesses along with the contacts. This construction technique is fast and simple.
The lamp unit also includes a handle to enable a heated lamp unit to be replaced by the user and a guide means to enable the lamp unit to be oriented quickly and accurately upon insertion into the socket. In their preferred forms, the handle and the guide means are identically configured and comprise fins extending outwardly of the convex surface of the reflector, the fins lying on opposite sides of the opening and in the same plane.
The socket into which guide means is inserted includes a first upstanding member defining a reference plane against which a portion of the reflector is engaged in use. A second upstanding structure engages another portion of the reflector to securely retain the reflector when it is inserted into the socket. The socket includes a pair of flexible contacts engageable with the contacts carried by the lamp unit, the socket contacts being positioned in a plane substantially parallel with the reference plane. When the lamp unit is inserted into the socket, the socket contacts are flexed sufficiently to make good electrical contact with the contacts carried by the lamp unit. A retention mechanism in the form of a flexible bail may be used to prevent inadvertent displacement of the lamp unit from the socket.

REFERENCES:
patent: 2415902 (1947-02-01), Noel
patent: 2955274 (1960-10-01), Binder et al.
patent: 3003058 (1961-10-01), Babcock
patent: 3014197 (1961-12-01), Werner
patent: 3314331 (1967-04-01), Wiley
patent: 3502864 (1970-03-01), Wagner
patent: 4100592 (1978-07-01), Henkel et al.

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