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An LED module that includes an LED (light-emitting diode) and a rotationally symmetrical, bowl-shaped collimator lens is provided. The collimator lens has an inner refractive wall, an outer reflective wall, a first surface having an entrance aperture with a recess in which the LED is situated and wh

An LED module that includes an LED (light-emitting diode) and a rotationally symmetrical, bowl-shaped collimator lens is provided. The collimator lens has an inner refractive wall, an outer reflective wall, a first surface having an entrance aperture with a recess in which the LED is situated and which collimator lens is also provided with a second surface from which light generated by the LED emerges, the normal to the surface extending substantially parallel to the axis of symmetry of the lens, and the LED module also includes one or more of the following structures: (1) a conic wall portion of the recess of the inner refractive wall at the entrance aperture that includes a curved portion, and an outer reflective wall so configured in accordance with the structure of the inner refractive wall to achieve substantial collimation of a source of light at the entrance aperture; and/or (2) a first surface of the lens that is recessed away from the LED source; and/or (3) two surfaces of said refractive wall between which the refractive function of said refractive wall is divided. The LED module offers an improvement in the performance of the Flat top Tulip Collimator disclosed and claimed in our co-pending application Ser. No. 09/415,833 in terms of reduced size, beam divergence, beam uniformity, and to some degree efficiency. Moreover, it allows a wider variety of choices in optimizing various performance characteristics, and this in turn allows more flexibility in the structure design.

대표청구항 ▼

An LED module that includes an LED (light-emitting diode) and a rotationally symmetrical, bowl-shaped collimator lens is provided. The collimator lens has an inner refractive wall, an outer reflective wall, a first surface having an entrance aperture with a recess in which the LED is situated and wh

An LED module that includes an LED (light-emitting diode) and a rotationally symmetrical, bowl-shaped collimator lens is provided. The collimator lens has an inner refractive wall, an outer reflective wall, a first surface having an entrance aperture with a recess in which the LED is situated and which collimator lens is also provided with a second surface from which light generated by the LED emerges, the normal to the surface extending substantially parallel to the axis of symmetry of the lens, and the LED module also includes one or more of the following structures: (1) a conic wall portion of the recess of the inner refractive wall at the entrance aperture that includes a curved portion, and an outer reflective wall so configured in accordance with the structure of the inner refractive wall to achieve substantial collimation of a source of light at the entrance aperture; and/or (2) a first surface of the lens that is recessed away from the LED source; and/or (3) two surfaces of said refractive wall between which the refractive function of said refractive wall is divided. The LED module offers an improvement in the performance of the Flat top Tulip Collimator disclosed and claimed in our co-pending application Ser. No. 09/415,833 in terms of reduced size, beam divergence, beam uniformity, and to some degree efficiency. Moreover, it allows a wider variety of choices in optimizing various performance characteristics, and this in turn allows more flexibility in the structure design. e of incidence relative to the first wafer plane, the second light source directing a ring pattern of light toward the bump at a second angle of incidence relative to the first wafer plane, the second angle of incidence being different than the first angle of incidence. 4. An apparatus according to claim 3 comprising at least a third light source for directing a ring pattern of light toward the bump at a third angle of incidence relative to the first wafer plane, the third angle of incidence being different than the first and second angles of incidence. 5. An apparatus according to claim 4 wherein the first angle of incidence is between about eighteen degrees and twenty-two degrees, the second angle of incidence is between about fifty-eight degrees and sixty-two degrees, and the third angle of incidence is between about forty-three degrees and about forty-seven degrees. 6. An apparatus according to claim 5 wherein the first angle of incidence is twenty degrees, the second angle of incidence is sixty degrees, and the third angle of incidence is forty-five degrees. 7. An apparatus according to claim 3 wherein the first angle of incidence is between about eighteen degrees and twenty-two degrees and the second angle of incidence is between about fifty-eight degrees and sixty-two degrees. 8. An apparatus according to claim 1 wherein the light support includes a first annular light supporting section for carrying the first light source and a second annular light supporting section for carrying the second light source. 9. An apparatus according to claim 8 wherein the first light source comprises a plurality of discrete lighting elements distributed about the first annular light supporting section and the second light source comprises a plurality of discrete lighting elements distributed about the second annular light supporting section. 10. An apparatus for directing light toward at least one light reflective bump formed on a first wafer surface of a semiconductor wafer, the apparatus comprising: a first set of a plurality of first light emitting diodes arranged in a ring to emit light in a first light source plane, and a second light source comprising a second set of a plurality of second light emitting diodes arranged in a ring to emit light in a second light source plane, the first wafer surface being planar and in a plane which is parallel to the first and second light source planes. 11. An apparatus according to claim 10 in which the intensity of light from the first set of first light emitting diodes is independently adjustable from the intensity of light from the second set of second light emitting diodes. 12. An apparatus according to claim 10 in which the light emitting diodes emit red light. 13. An apparatus according to claim 10 in which at least a majority of the light emitting diodes emit red light. 14. An apparatus according to claim 10 in which the light emitting diodes have a narrow focus of no greater than about fifteen degrees. 15. An apparatus for directing light toward a wafer surface of a semiconductor wafer, the apparatus comprising at least a first ring of light sources and a second ring of light sources, the first and second rings of light sources being supported at locations such that the rings are spaced apart from one another and from the wafer surface, the intensity of the light from the first and second rings of light sources being independently adjustable. 16. An apparatus according to claim 15 comprising at least one third ring of light sources supported at a location intermediate to the first and second ring of light sources, the intensity of light from the third ring of light sources being independently adjustable from the intensity of light from the first and second rings of light sources. 17. An apparatus for directing ring patterns of light toward a wafer surface of a semiconductor wafer, the apparatus comprising a light support with at least a first set of bores arranged in a first ring patt