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R lamp having an improved neck section for increasing the useful light output

  • US 4,536,834 A
  • Filed: 05/22/1984
  • Issued: 08/20/1985
  • Est. Priority Date: 05/22/1984
  • Status: Expired due to Fees
First Claim
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1. A reflector lamp comprising an electrically conductive base, a concave reflector, and a finite light source having its geometric center located approximately at the focal point of the concave reflector and rigidly affixed to an electrically insulative stem;

  • said concave reflector comprising;

    (a) a primary reflective section having a parabolic shape and a focal point;

    (b) one or more intermediate reflective section each having a parabolic shape substantially confocal with said primary reflective section and each respectively joined by one or more transitional sections and;

    (c) a neck section effective in advantageously reflecting light rays impinging onto its surface back into the useful beam pattern of the reflector lamp and comprising;

    (ci) a reducing section;

    (cii) a first substantially straight cylindrical section;

    (ciii) an expanding section, and;

    (ciiii) a second substantially straight cylindrical section for mating with the electrically conductive base.

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