# US 4,686,612 A · Lamp reflector assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,686,612 A - Document ID: US4686612A - Status: Granted - Kind: A - Application number: 06/791,214 - Filed: 1985-10-25 - Granted: 1987-08-11 - Earliest claimed: 1985-10-25 - Assignees: Optech Inc. - Inventors: David A. Pringle; Helen Gourley - Web page: https://patentgrep.com/patent/US4686612A ## CPC - F21V 29/83: the elements having apertures, ducts or channels, e.g. heat radiation holes - F21V 5/04: of lens shape - F21V 7/09: with a combination of different curvatures - F21V 17/02: with provision for adjustment (F21V17/04 - F21V17/08 take precedence) - F21V 17/107: {using hinge joints} - F21V 29/763: {the planes containing the fins or blades having the direction of the light emitting axis} - F21W 2131/406: for theatres, stages or film studios - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS ## Abstract A reflector assembly for projecting a beam of light along an optical axis, the assembly including an enclosure having an aperture for projecting the beam of light and a source of light mounted within the enclosure. A reflecting mirror is disposed within the enclosure and arranged to move axially with respect to the optical axis of the beam of light between positions adjacent the aperture and remote from the aperture. A plurality of reflector segments are disposed between the movable reflector and the aperture in the enclosure, the segments each being defined as a portion of a cone or cylinder and with gaps therebetween arranged so as to permit the passage of air between the segments. ## Claims ### Claim 1 A reflector assembly for projecting a beam of light along an optical axis, said assembly comprising: (a) an enclosure having an aperture for projecting said beam of light; (b) a source of light mounted within said enclosure; (c) a reflecting mirror disposed within said enclosure, arranged to move axially with respect to the optical axis of the beam of light between positions adjacent said aperture and remote from said aperture, and disposed to reflect light source through said aperture; and (d) a plurality of reflector segments disposed between said movable reflector and the aperture in said enclosure, said segments each being defined as a portion of a cone or cylinder and with gaps therebetween arranged so as to permit the passage of air between such segments. ### Claim 2 (depends on 1) The reflector assembly of claim 1, wherein said segments are disposed at differing angles to the optical axis, said differing angles being selected such as to project the light emitted by the bulb either toward said aperture or toward said reflecting mirror. ### Claim 3 (depends on 1) Reflector assembly of claim 1, wherein a fresnel lens is disposed in said aperture. ### Claim 4 (depends on 1) The reflector assembly of claim 1 wherein said reflecting mirror is defined by upper and lower portions each of which defines a portion of a sphere, said portions being arranged with respect to each other to return images of the light source above an below said light source. ### Claim 5 (depends on 4) The reflector assembly of claim 4, wherein each said portion of said reflecting mirror comprises two parts of a spherical reflecting mirror, each part being canted toward said optical axis. ### Claim 6 (depends on 1) The reflector assembly of claim 1, wherein one group of said reflector segments is fixed relative to said reflecting mirror to move axially therewith and a second group of said reflector segments is fixed relative to the enclosure such as to remain fixed when the reflecting mirror and the first group of reflector segments is moved axially within the enclosure. ### Claim 7 (depends on 6) The reflector assembly of claim 6, wherein the first group of reflector segments reflects light toward said aperture and wherein the second group of reflector segments reflects light towards said reflecting mirror when said reflecting mirror is disposed remote from said aperture. ### Claim 8 A reflecting mirror for reflecting a beam of light emitted from a light source along an optical axis, said mirror comprising at least two spherical sections for reflecting the light generally in the same direction along said optical axis, each said mirror being arranged to produce an image of the light source adjacent to but not coincident with the light source. ### Claim 9 (depends on 8) The mirror of claim 8, wherein the reflecting surface of each of said portions defines a portion of a sphere, which portion is defined by taking a first chord through a sphere dividing the sphere into two unequally size pieces, taking a second chord at right angles to the first cord through the smaller of the two pieces thereby dividing the smaller piece into still two more unequally size pieces, the portion of the mirror being defined by the larger of the last mentioned two pieces. ### Claim 10 (depends on 8) The reflecting mirror of claim 8 wherein said at least two spherical sections are joined along a line which intersects the optical axis of the reflecting mirror. ### Claim 11 (depends on 10) The reflecting mirror of claim 10, wherein a lamp provides the light source and is disposed on the optical axis of the mirror and forwardly of said line. ### Claim 12 (depends on 8) The reflecting mirror of claim 8, wherein the reflecting surface of each of said sections define a portion of a sphere, which portion is defined by taking a first chord through a sphere, dividing the sphere into two unequally sized pieces. ### Claim 13 A reflecting mirror for reflecting a beam of light emitted from a light source along an optical axis, said mirror comprising at least two concave sections which confront each other and are disposed on the same side of said light source, each section being arranged to produce an image of the light source which is adjacent to but not coincident with the light source. ### Claim 14 (depends on 13) The reflecting mirror of claim 13, wherein the reflecting surface of each of said sections defines a portion of a sphere, which portion is obtained by taking a first cord through a sphere, dividing the sphere into two unequally sized pieces, taking a second cord at right angles to the first cord through a smaller of the two pieces thereby dividing the smaller piece into still two more unequally sized pieces, the section of the mirror being defined by the larger of the last two-mentioned pieces. ### Claim 15 (depends on 13) The reflecting mirror of claim 13, wherein said at least two sections are joined along a line which intersects the optical axis of the reflecting mirror. ### Claim 16 (depends on 15) The reflecting mirror of claim 15, wherein said light source is provided by a lamp which is disposed on the optical axis of the mirror and forwardly of said line. ### Claim 17 (depends on 13) The reflecting mirror of claim 13, wherein the reflecting surface of each of said sections defines a portion of a sphere. ### Claim 18 (depends on 17) The reflecting mirror of claim 17, wherein each portion is defined by taking a first cord through a sphere which divides the sphere into two unequally sized pieces.