Light diffusion type light emitting diode

• US 5,140,220 A
• Filed: 09/01/1988
• Issued: 08/18/1992
• Est. Priority Date: 12/02/1985
• Status: Expired due to Fees

• Current Assignee: Masakatsu Uchiyama, Yumi Sakai
• Original Assignee: Masakatsu Uchiyama, Yumi Sakai
• Inventors: Hasegawa, Yasuo
• Primary Examiner(s): Yusko, Donald J.
• Assistant Examiner(s): Horabik, Michael
• Application Number:
  US07/240,416
• Time in Patent Office: 1,447 Days
• Field of Search: 313/110, 313/116, 313/499, 313/500, 313/501, 313/512, 340/815.01, 340/815.15, 340/815.17, 362/297, 362/327, 362/329, 362/800
• US Class Current: 313/512
• CPC Class Codes: F21V 17/04 the fastening being onto or by the light source
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 5/00 Refractors for light sources characterised by cooling arrangements F21V29/504
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

An improved light emitting diode housing member comprises a transparent housing that can extend over the light emitting surface of the LED and can position a plurality of granular optical particles, such as calcium fluoride, over the source of light to provide a diffusion of the emitted light, thereby increasing its viewing angle.

Claims

1. An improved light diffusing light emitting diode assembly comprising:

a light emitting device with a light radiating end capable of controlling the direction of a radiated output of light;

a transparent hollow housing member mounted on the light emitting device and extending over the light radiating end, and

a plurality of granular optical particles positioned within the transparent hollow housing member and extending between the light radiating end and the housing member, the granular optical particles having exposed surfaces within the hollow portion of the housing member for reflecting and refracting light from the light radiating end and also having particle surfaces adhering to the housing member to stationarily fix those optical particles, whereby a diffusion of light can be accomplished.

2. The diode assembly of claim 1 wherein the granular particles are formed of calcium fluoride.

3. The diode assembly of claim 1 wherein the granular particles are approximately 20 to 30 mesh in particle size.

4. The diode assembly of claim 1 wherein the granular particles are potted in methylene chloride within the housing member.

5. The diode assembly of claim 1 wherein the housing member has a plurality of planar facets.

6. The diode assembly of claim 4 wherein the granular particles are formed of calcium fluoride and are secured by methylene chloride within the housing member.

7. An improved light diffusing light emitting diode assembly comprising:

a light emitting base member having a light emitting device mounted in a transparent plastic housing member, the base member including a light radiating end member and a coupling portion extending adjacent to and around the light radiating end member on the plastic housing member;

a light diffusing member of a hemispherical hollow core configuration is dimensioned to interface with and is fixed to the coupling portion, and

a plurality of granular optical particles positioned within the hollow core and extending between the light radiating end member and the light diffusing member, the granular optical particles having air exposed surfaces within the hollow core of the diffusing member for reflecting and refracting light projecting from the light radiating end and also having particle surfaces adhering to the housing member to stationarily fix the optical particles.

8. The diode assembly of claim 7 wherein the granular particles are calcium fluoride.

9. The diode assembly of claim 7 wherein the granular particles are approximately 20 to 30 mesh in particle size.

10. The diode assembly of claim 7 wherein an exterior envelope of the diffusing member has a multifaceted configuration.

11. An improved light diffusing light emitting diode assembly consisting of:

a single light emitting device with a transparent light radiating end positioned above the light emitting device and capable of controlling the direction of a radiated output of light;

a coupling portion integrally positioned on the light radiating end;

a transparent hollow housing member mounted on the coupling portion of the light emitting device and extending over the light radiating end, an exterior surface of the housing member has a multifaceted configuration, and

a plurality of granular optical particles of approximately 20 to 30 mesh in particles size are positioned within the transparent hollow housing member and extend between the light radiating end and the housing member, the granular optical particles having air exposed surfaces within the hollow portion of the housing member for reflecting and refracting light from the light radiating end and some, but not all of the particles also having a portion of their particle surfaces adhering to the housing member to stationarily fix those optical particles, whereby a diffusion of light can be accomplished.

12. The diode assembly of claim 11 wherein the granular particles are embedded into an interior surface of the hollow housing member.