LIGHT-EMITTING DEVICE AND ILLUMINATION APPARATUS USING THE SAME

• US 20090316384A1
• Filed: 01/11/2008
• Published: 12/24/2009
• Est. Priority Date: 01/12/2007
• Status: Abandoned Application

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Kanayama, Yoshihiko, Ueda, Kenji, Tamura, Tetsushi
• Application Number:
  US12/518,566
• Publication Number:
  US 20090316384A1
• Time in Patent Office: Days
• US Class Current: 362/84
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21S 41/147 the main emission direction of the LED being angled to the optical axis of the illuminating device
• CPC Class Codes: F21S 41/148 the main emission direction of the LED being perpendicular to the optical axis
• CPC Class Codes: F21S 41/153 arranged in a matrix
• CPC Class Codes: F21S 41/24 Light guides
• CPC Class Codes: F21S 41/323 the reflector having two perpendicular cross sections having regular geometrical curves of a distinct nature
• CPC Class Codes: F21S 41/43 characterised by the shape thereof
• CPC Class Codes: F21S 8/02 of recess-mounted type, e.g. downlighters specially adapted for vehicle exteriors F21S41/00-F21S45/00
• CPC Class Codes: F21V 7/0025 Combination of two or more reflectors for a single light source array of reflectors for a cluster of light sources F21V7/0083
• CPC Class Codes: F21V 7/06 with parabolic curvature
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/0401 Bonding areas specifically adapted for bump connectors, e.g. under bump metallisation [UBM]
• CPC Class Codes: H01L 2224/16 of an individual bump connector
• CPC Class Codes: H01L 24/17 of a plurality of bump connectors
• 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 2924/00011 Not relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• 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 2924/01012 Magnesium [Mg]
• CPC Class Codes: H01L 2924/0102 Calcium [Ca]
• CPC Class Codes: H01L 2924/01025 Manganese [Mn]
• CPC Class Codes: H01L 2924/01029 : Copper [Cu]
• CPC Class Codes: H01L 2924/01046 : Palladium [Pd]
• CPC Class Codes: H01L 2924/01057 : Lanthanum [La]
• CPC Class Codes: H01L 2924/01063 : Europium [Eu]
• CPC Class Codes: H01L 2924/01079 : Gold [Au]
• CPC Class Codes: H01L 2924/01322 : Eutectic Alloys, i.e. obtained by a liquid transforming into two solid phases
• CPC Class Codes: H01L 2924/12041 : LED
• 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

Abstract

A light-emitting device (1) includes: a base (11); a light-emitting element (12) that is disposed on one principal surface (11a) of the base (11); and a light distribution control reflector (14) that is disposed so as to surround the light-emitting element (12). The light distribution control reflector (14) is at least part of a substantial paraboloid of revolution, and a substantial paraboloid-of-revolution surface (14a) that constitutes an inner surface of the light distribution control reflector (14) is a light-reflecting surface for collecting light emitted from the light-emitting element (12). The light-emitting element (12) is disposed at a position of a substantial focal point of the substantial paraboloid-of-revolution surface (14a), and a normal (N) to the one principal surface (11a) of the base (11) is inclined toward a vertex (P) of the substantial paraboloid of revolution with respect to a direction orthogonal to an axis (X) of the substantial paraboloid of revolution. Thus, the light-emitting device (1) can be provided in which light distribution control can be facilitated.

Claims

1. A light-emitting device, comprising:

a base;

a light source portion that includes a light-emitting portion disposed on one principal surface of the base; and

a light distribution control reflector that is disposed so as to surround the light source portion,

wherein the light distribution control reflector is at least part of a substantial paraboloid of revolution, and a substantial paraboloid-of-revolution surface that constitutes an inner surface of the light distribution control reflector is a light-reflecting surface for collecting light emitted from the light source portion,

a light outgoing portion of the light source portion is disposed at a position of a substantial focal point of the substantial paraboloid-of-revolution surface, and

an optical axis of the light source portion is inclined toward a vertex of the substantial paraboloid of revolution with respect to a direction orthogonal to an axis of the substantial paraboloid of revolution.

2. The light-emitting device according to claim 1,

wherein the light-emitting portion comprises a light-emitting element.

3. The light-emitting device according to claim 2,

wherein the light-emitting portion further comprises a translucent material that covers the light-emitting element.

4. The light-emitting device according to claim 2,

wherein the light-emitting portion further comprises a phosphor portion that covers the light-emitting element.

5. The light-emitting device according to claim 1,

wherein a normal to the one principal surface of the base is inclined toward the vertex of the substantial paraboloid of revolution with respect to the direction orthogonal to the axis of the substantial paraboloid of revolution.

6. The light-emitting device according to claim 1,

wherein an optical axis of the light-emitting portion is inclined toward the vertex of the substantial paraboloid of revolution with respect to the direction orthogonal to the axis of the substantial paraboloid of revolution.

7. The light-emitting device according to claim 1,

wherein the light-emitting portion further comprises an optical path changing portion, and an optical axis of the light-emitting portion is inclined toward the vertex of the substantial paraboloid of revolution with respect to the direction orthogonal to the axis of the substantial paraboloid of revolution.

8. The light-emitting device according to claim 1,

wherein the light source portion further comprises an optical path changing portion.

9. The light-emitting device according to claim 1,

wherein the light distribution control reflector is the substantial paraboloid of revolution.

10. The light-emitting device according to claim 1, further comprising an optical path changing portion that changes an optical path of light emitted from an opening of the light distribution control reflector.

11. An illumination apparatus comprising a light-emitting device as claimed in claim 1.