Wide-area lamp

• US 5,084,804 A
• Filed: 10/13/1989
• Issued: 01/28/1992
• Est. Priority Date: 10/21/1988
• Status: Expired due to Fees

• Current Assignee: Telefunken Electronic GmbH FED REP of Germany
• Original Assignee: Telefunken Electronic GmbH
• Inventors: Schairer, Werner
• Primary Examiner(s): Lazarus, Ira S.
• Assistant Examiner(s): Hagarman, Sue
• Application Number:
  US07/421,234
• Time in Patent Office: 837 Days
• Field of Search: 362/61, 362/80, 362/800, 362/245, 362/250, 362/327, 362/328, 357/72, 357/67, 357/68
• US Class Current: 362/459
• CPC Class Codes: F21S 43/14 Light emitting diodes [LED]
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2107/70 on flexible or deformable supports or substrates, e.g. for changing the light source into a desired form
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 25/13 the devices being of a type provided for in group H01L33/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

The invention relates to a wide-area lamp in which luminescent semiconductor elements in a wide-area spread are connected to one another by a conducting path structure and the individual luminescent semiconductor elements are surrounded by casing elements. The invention provides for the conducting path structure between the individual casing elements to be designed movable such that the lamp can be curved to any shape required. The casing elements are here surrounded by parabolic reflectors, with the conducting path structure with the semiconductor elements being so arranged that one semiconductor element is in the focal point of each reflector.

Claims

1. A wide-area lamp wherein:

a plurality of luminescent semiconductor elements in a wide-area spread are mounted directly on and connected to one another by a conducting path structure;

wherein each semiconductor element and an adjacent respective portion of said connector path structure is surrounded by a respective casing element;

the casing elements are surrounded in part by respective reflectors; and

the conducting path structure between said individual casing elements is movable such that the lamp can be curved to the shape required.

2. A wide-area lamp according to claim 1, wherein the reflectors are parabolic in form and wherein the conducting path structure with the connected semiconductor elements is arranged such that in each case one semiconductor element is in the area of the focal point of a respective said reflector.

3. A wide area lamp according to claim 2 wherein said semiconductor elements and said reflectors are arranged on a lower side of said conducting path structure.

4. A wide-area lamp according to claim 3, wherein:

additional reflectors are arranged on the upper side of the conducting path structure; and

each additional reflector has the shape of a truncated parabola and together with a respective reflector on the underside of said conducting path structure has the form of a respective paraboloid.

5. A wide-area lamp according to claim 4, wherein the additional reflectors on the upper side of the conducting path structure are plastic elements whose outer surfaces are highly reflective.

6. A wide-area lamp according to claim 2, wherein each said casing element is formed of plastic in which the respective said semiconductor element is embedded, wherein the respective outer faces of said plastic casing elements are of said parabolic form, and wherein said reflectors are disposed on said outer faces.

7. A wide-area lamp according to claim 6, wherein the respective outer faces of the plastic casing elements each are surrounded by a mold whose inside forms the respective reflector.

8. A wide area lamp according to claim 6 wherein said reflectors are reflective coatings disposed on said outer faces of said casing elements.

9. A wide-area lamp according to claim 2, wherein the casing elements of the semiconductor elements are formed of transparent plastic and are surrounded in part by a shaped element whose inside forms the reflectors, and wherein there is air between each plastic casing element and said shaped element.

10. A wide-area lamp according to claim 1, wherein the semiconductor elements are connected in parallel and/or in series by means of the conducting path structure.

11. Use of a wide-area lamp according to claim 1 for automobile lights, signal lights or side lights.

12. In a method for manufacturing a wide-area lamp according to claim 2, the improvement wherein:

initially the semiconductor elements are mounted and provided with contacts on a self-supporting conducting path structure stabilized by auxiliary path connections;

wherein the semiconductor elements are provided with said casing elements; and

wherein the auxiliary connections are subsequently removed.

13. A method according to claim 12, wherein the semiconductor elements are sealed in plastic with the aid of a mold for forming said casing elements, wherein after removal of the mold the outer surfaces of said casing elements are coated with a highly reflective material, wherein the auxiliary connections are subsequently removed by being cut free, and wherein the conducting path structure is provided with a certain curvature required by bending it between said casing elements.

14. A method according to claim 12, wherein the inner surfaces of a mold having a certain curvature required is coated with a highly reflective material, wherein the semiconductor elements are sealed in said mold with a plastic to form said casing elements, and wherein the auxiliary connections are removed by being cut free without removing said mold.

15. A method according to claim 12, wherein the semiconductor elements have a plastic material dripped onto them to form said casing elements, wherein the inner surface of a shaped element having a certain curvature required is coated with a highly reflective material, and wherein the conducting path structure with said semiconductor elements is placed on said shaped element and glued to said shaped, element after cutting free the auxiliary connections.

16. A method according to claim 12, wherein said semiconductor elements and said casing elements are disposed on a lower side of said stabilized conducting path structure;

and further comprising attaching additional casing elements to the upper side of said stabilized conducting path structure and metallically coating the outer surfaces of said additional casing elements.

17. A wide area lamp according to claim 1 wherein said reflectors are parabolic and each of said luminescent semiconductor elements is disposed on a surface of said conducting path structure which faces the surface of the respective said reflector.

18. A wide area lamp comprising:

a plurality of luminescent semiconductor elements arranged in a wide-area spread;

a conductor path structure including a plurality of flat metal flexible conductors formed from a flexible sheet of metal for physically and electrically connecting said elements together, with each of said semiconductor elements being mounted on one surface of and electrically contacting one end of one said conductor and being electrically connected to an end of an adjacent different one of said conductors;

a respective plastic housing element surrounding and embedding each of said semiconductor elements and the associated said ends of said conductors so that said conductors between said housing elements remain flexible, whereby said lamp can be curved to a desired shape by flexing of the conductors between said housing elements; and

a respective reflector partially surrounding each said casing element such that said one surface of each said conductor faces the surface of the respective said reflector.

19. A wide area lamp comprising:

a plurality of luminescent semiconductor elements arranged in a wide-area spread;

a conductor path structure including a plurality of flat metal flexible conductors formed from a flexible sheet of metal for physically and electrically connecting said elements together, with each of said semiconductor elements being mounted on one surface of and electrically contacting one end of one said conductor and being electrically connected to an end of an adjacent different one of said conductors;

a respective plastic housing element surrounding and embedding each of said semiconductor elements and the associated said ends of said conductors so that said conductors between said housing elements remain flexible, whereby said lamp can be curved to a desired shape by flexing of the conductors between said housing elements, and with the outer surface of each of said housing elements facing said one surface of said conductors having the shape of a paraboloid, and with each said semiconductor element being disposed in the area of the focal point of the respective said parabola of the associated said housing element.

20. A wide area lamp as defined in claim 19 further comprising a respective reflective surface disposed adjacent and covering said outer surface of each of said housing elements.