Light emitting diode lamp and light emitting diode display unit

• US 20060039143A1
• Filed: 10/11/2005
• Published: 02/23/2006
• Est. Priority Date: 07/17/2002
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Omoto, Masatoshi, Seko, Masahiro, Miyata, Masataka, Takasugi, Keiji, Katoh, Masaaki
• Granted Patent: US 7,473,014 B2
• Time in Patent Office: Days
• US Class Current: 362/244
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• 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: Y10S 362/80 Light emitting diode

Abstract

An LED lamp has a convex lens 3 which has an upper portion 5 and a lower portion 6. An upper curved surface 5A of the upper portion is different in shape from a lower curved surface 6A of the lower portion 6 so as to refract rays of light from an LED chip 2 more strongly than the lower curved surface 6A does. This avoids reflection of incident outside light toward a front and hence prevents misrecognition. An interface plane S1 between the upper and lower portions 5 and 6 of the convex lens 3 is located on an upper end face 2A to thereby prevent collection of outgoing light upon the interface plane S1 and generation of an irregular emission peak at the front.

Claims

1. A light emitting diode lamp comprising:

at least one light emitting diode chip; and

a convex lens through which rays of light emitted from the at least one light emitting diode chip pass, wherein the convex lens has two different curved surfaces, one on each side of a plane, wherein the plane is orthogonal to a light emitting surface of the light emitting diode chip, and either extending from a point on the light emitting surface other than a center of the light emitting surface or extending from a point on an extension of the light emitting surface, and one of the curved surfaces of the convex lens refracts outgoing rays of light from the light emitting diode chip more than the other of the curved surfaces of the convex lens does.

2. The light emitting diode lamp as defined in claim 1, wherein the orthogonal plane does not intersect with the light emitting diode chip.

3. The light emitting diode lamp as defined in claim 1, comprising more than one light emitting diode chips, which are arrayed in one direction.

4. The light emitting diode lamp as defined in claim 1, wherein said at least one light emitting diode chip is molded by resin having light absorption band in a wavelengths other than a peak wavelength of rays of light emitted by the light emitting diode chip, and the resin constitutes the convex lens.

5. The light emitting diode lamp as defined in claim 1, wherein said at least one light emitting diode chip is mounted on a black surface-treated lead frame.

6. The light emitting diode lamp as defined in claim 1, further comprising a reflection cup surrounding at least a part of a periphery of the light emitting diode chip, and an inner peripheral surface of the reflection cup is black surface-treated.

7. The light emitting diode lamp as defined in claim 1, wherein black-colored resin is mounted on a lead frame on which the light emitting diode chip is mounted, the black-colored resin being positioned behind the light emitting diode chip.

8. A light emitting diode display unit comprising the light emitting diode lamp as defined in claim 1.

9. The light emitting diode lamp as defined in claim 1, wherein at least one of said two curved surfaces of the convex lens comprises a plurality of curved surfaces different in shape.

10. The light emitting diode lamp as defined in claim 9, wherein the plurality of curved surfaces include a curved surface on one side and a curved surface on the other side of a plane that is orthogonal to the extension of the light emitting surface of the light emitting diode chip and that does not intersect with the light emitting diode chip.

11. The light emitting diode lamp as defined in claim 9, comprising more than one light emitting diode chips, which are arrayed in one direction.

12. The light emitting diode lamp as defined in claim 9, wherein the light emitting diode chips are molded by resin having a light absorption band in wavelengths other than a plurality of wavelength peaks of rays of lights emitted by the light emitting diode chips, and the resin constitutes the convex lens.

13. The light emitting diode lamp as defined in claim 9, further comprising a reflection cup surrounding at least a part of a periphery of the light emitting diode chip, and an inner peripheral surface of the reflection cup is black surface treated.

14. The light emitting diode lamp as defined in claim 9, wherein black-colored resin is mounted on a lead frame on which the light emitting diode chip is mounted, the black-colored resin being positioned behind the light emitting diode chip.

15. A light emitting diode display unit comprising the light emitting diode lamp as defined in claim 9.

16. The light emitting diode lamp as defined in claim 9, wherein the at least one LED chip is mounted on a black surface-treated lead frame.

17. A light emitting diode lamp comprising:

a lead frame having a mounting portion, said lead frame having a center axis;

at least one light emitting diode chip mounted on the mounting portion of the lead frame and having an optical axis; and

a resin in which said at least one light emitting diode chip is encapsulated, said resin having a tip portion convexly curved forward in an emission direction of the light emitting diode chip such that the tip portion functions as a convex lens, wherein the optical axis of the at least one light emitting diode chip passes through said tip portion of the resin, and wherein

the optical axis of the at least one light emitting diode chip coincides with or is parallel to the center axis of the lead frame, and

the resin has, at at least the tip portion, two different curved surfaces, one on each side of a plane, wherein the plane is orthogonal to a light emitting surface of the light emitting diode chip, and either extends from a point on the light emitting surface other than a center of the light emitting surface or extends from a point on an extension of the light emitting surface.

18. The light emitting diode lamp as defined in claim 17, wherein one of the curved surfaces of the resin is a curved surface that refracts outgoing rays of light from the light emitting diode chip more than the other of the curved surfaces of the convex lens does.

19. The light emitting diode lamp as defined in claim 17, wherein the two curved surfaces of the resin are configured such that incoming sunlight refracted by one of the curved surfaces into the resin and then reflected upon the mounting portion of the lead frame is totally reflected by the other of the curved surfaces.

20. A light emitting diode lamp comprising:

a plurality of light emitting diode chips; and

a convex lens through which rays of light emitted from the light emitting diode chips pass, wherein

the convex lens has two different curved surfaces, one on each side of an interface plane, wherein the interface plane is orthogonal to a light emitting surface of each light emitting diode chip, and either extends from a point on the light emitting surface other than a center of the light emitting surface or extends from a point on an extension of the light emitting surface, and

the plurality of light emitting diode chips are arrayed in a lateral direction parallel to the interface plane.