LIGHT SOURCE UNIT

• US 20110273873A1
• Filed: 04/27/2011
• Published: 11/10/2011
• Est. Priority Date: 05/06/2010
• Status: Active Grant

• Current Assignee: Funai Electric Co., Ltd.
• Original Assignee: Funai Electric Co., Ltd.
• Inventors: SUZUKI, Yuto, TAJIRI, Tomohisa
• Granted Patent: US 8,608,338 B2
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21Y 2103/00 Elongate light sources, e.g. fluorescent tubes
• CPC Class Codes: F21Y 2115/20 Electroluminescent [EL] light sources
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: Y10T 29/49826 Assembling or joining

Abstract

A light source unit includes an LED mount bar and a set of LEDs. The LED mount bar has an inside channel that is located at a center portion of the LED mount bar, and outside channels that are located at outside portions of the LED mount bar, respectively. The set of LEDs is disposed in the inside channel and the outside channels. The set of LEDs is ranked into a plurality of chromaticity regions within a predetermined chromaticity range in a chromaticity coordinate system and ranked into a plurality of luminous flux ranges according to a luminous flux value of the LEDs, respectively. The inside channel including a plurality of first LEDs from a subset of the set of LEDs. The subset of LEDs is ranked in a predetermined chromaticity region of the chromaticity regions and ranked in a predetermined luminous flux range of the luminous flux ranges.

Claims

1. A light source unit comprising:

an LED mount bar having an inside channel that is located at a center portion of the LED mount bar, and outside channels that are located at outside portions of the LED mount bar, respectively, with the outside portions being disposed longitudinal outside of the LED mount bar relative to the center portion, respectively; and

a set of LEDs disposed in the inside channel and the outside channels, the set of LEDs being ranked into a plurality of chromaticity regions within a predetermined chromaticity range in a chromaticity coordinate system and ranked into a plurality of luminous flux ranges according to a luminous flux value of the LEDs, respectively, the inside channel including a plurality of first LEDs from a subset of the set of LEDs, the subset of LEDs being ranked in a predetermined chromaticity region of the chromaticity regions and ranked in a predetermined luminous flux range of the luminous flux ranges.

2. The light source unit according to claim 1, wherein

the outside channels include a plurality of second LEDs from the set of LEDs.

3. The light source unit according to claim 2, wherein

the second LEDs include LEDs from a combination of the subset of LEDs and outside of the subset of LEDs.

4. The light source unit according to claim 2, wherein

the second LEDs include LEDs only from outside of the subset of LEDs.

5. The light source unit according to claim 1, wherein

the chromaticity regions include first and second chromaticity regions, the first chromaticity region being positioned at a center region within the chromaticity range in the chromaticity coordinate system, the second chromaticity region being positioned on a periphery of the first chromaticity region within the chromaticity range in the chromaticity coordinate system,

the luminous flux ranges include first and second luminous flux ranges, the first luminous flux range having a larger luminous flux value than the second luminous flux range,

the first LEDs being from the subset of LEDs that is ranked in the first chromaticity region and ranked in the first luminous flux range.

6. The light source unit according to claim 2, wherein

the chromaticity regions include first and second chromaticity regions, the first chromaticity region being positioned at a center region within the chromaticity range in the chromaticity coordinate system, the second chromaticity region being positioned on a periphery of the first chromaticity region within the chromaticity range in the chromaticity coordinate system, and

the luminous flux ranges include first and second luminous flux ranges, the first luminous flux range having a larger luminous flux value than the second luminous flux range,

the first LEDs being from the subset of LEDs that is ranked in the first chromaticity region and ranked in the first luminous flux range.

7. The light source unit according to claim 6, wherein

the second LEDs include LEDs from a combination of the subset of LEDs and outside of the subset of LEDs, the outside of the subset of LEDs being ranked in the second chromaticity region and ranked in the second luminous flux range.

8. The light source unit according to claim 6, wherein

the second LEDs include LEDs only from outside of the subset of LEDs, the outside of the subset of LEDs being ranked in the second chromaticity region and ranked in the second luminous flux range.

9. The light source unit according to claim 5, wherein

the LED mount bar further has a second inside channel that is located at the center portion of the LED mount bar between the inside channel and one of the outside channels, the second inside channel including a plurality of third LEDs from the subset of LEDs.

10. The light source unit according to claim 6, wherein

the LED mount bar further has a second inside channel that is located at the center portion of the LED mount bar between the inside channel and one of the outside channels, the second inside channel including a plurality of third LEDs from the subset of LEDs.

11. The light source unit according to claim 7, wherein

the LED mount bar further has a second inside channel that is located at the center portion of the LED mount bar between the inside channel and one of the outside channels, the second inside channel including a plurality of third LEDs from the subset of LEDs.

12. The light source unit according to claim 8, wherein

the LED mount bar further has a second inside channel that is located at the center portion of the LED mount bar between the inside channel and one of the outside channels, the second inside channel including a plurality of third LEDs from the subset of LEDs.

13. A method for making a light source unit, the method comprising:

providing an inside channel and outside channels on an LED mount bar, the inside channel being located at a center portion of the LED mount bar, the outside channels being located at outside portions of the LED mount bar, respectively, with the outside portions being disposed longitudinal outside of the LED mount bar relative to the center portion, respectively;

providing a set of LEDs, the set of LEDs being ranked into a plurality of chromaticity regions within a predetermined chromaticity range in a chromaticity coordinate system and ranked into a plurality of luminous flux ranges according to a luminous flux value of the LEDs, respectively;

selecting a plurality of first LEDs from a subset of the set of LEDs, the subset of LEDs being ranked in a predetermined chromaticity region of the chromaticity regions and ranked in a predetermined luminous flux range of the luminous flux ranges; and

mounting the first LEDs on the inside channel of the LED mount bar.