Liquid displacer in LED bulbs

• US 8,820,954 B2
• Filed: 07/23/2012
• Issued: 09/02/2014
• Est. Priority Date: 03/01/2011
• Status: Expired due to Fees

• Current Assignee: Switch Bulb Company, Inc.
• Original Assignee: Switch Bulb Company, Inc.
• Inventors: Horn, David, Moylan, Christopher R., Wheelock, Glenn
• Primary Examiner(s): Truong, Bao Q
• Application Number:
  US13/556,141
• Publication Number:
  US 20120287608A1
• Time in Patent Office: 771 Days
• Field of Search: 362/294, 362/373, 362/101, 362/96, 362/580, 362/547, 362/126, 362/218, 362/264, 362/345, 362/800
• US Class Current: 362/101
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21V 29/58 characterised by the coolants
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y10T 29/49002 Electrical device making

Abstract

An LED bulb includes at least one LED mount disposed within a shell. At least one LED is attached to the at least one LED mount. A thermally conductive liquid is held within the shell. The LED and LED mount are immersed in the thermally conductive liquid. A liquid displacer is immersed in the thermally conductive liquid. The liquid displacer is configured to displace a predetermined amount of the thermally conductive liquid to reduce the amount of thermally conductive liquid held within the shell. The liquid displacer is also configured to be compressible, where the liquid displacer is compressed in response to expansion of the thermally conductive liquid.

Claims

1. A light-emitting diode (LED) bulb comprising:

a shell;

at least one LED mount disposed within the shell;

at least one LED attached to the at least one LED mount;

a thermally conductive liquid held within the shell, wherein the LED and LED mount are immersed in the thermally conductive liquid; and

a liquid displacer immersed in the thermally conductive liquid, wherein the liquid displacer is configured to displace a predetermined amount of the thermally conductive liquid to reduce the amount of thermally conductive liquid held within the shell, wherein the liquid displacer is configured to be compressible, wherein the liquid displacer is compressed in response to expansion of the thermally conductive liquid, and wherein the liquid displacer is suspended in the thermally conductive liquid.

2. A light-emitting diode (LED) bulb comprising:

a shell;

at least one LED mount disposed within the shell;

at least one LED attached to the at least one LED mount;

a thermally conductive liquid held within the shell, wherein the LED and LED mount are immersed in the thermally conductive liquid; and

a liquid displacer immersed in the thermally conductive liquid, wherein the liquid displacer is configured to displace a predetermined amount of the thermally conductive liquid to reduce the amount of thermally conductive liquid held within the shell, wherein the liquid displacer is configured to be compressible, wherein the liquid displacer is compressed in response to expansion of the thermally conductive liquid, and wherein the liquid displacer is not attached to other components or structures of the LED bulb.

3. A light-emitting diode (LED) bulb comprising:

a base;

a shell connected to the base;

at least one LED;

a thermally conductive liquid held within the shell, wherein the LED is immersed in the thermally conductive liquid; and

a liquid displacer immersed in the thermally conductive liquid, wherein the liquid displacer is configured to be compressible, wherein the liquid displacer is compressed in response to expansion of the thermally conductive liquid, and wherein the liquid displacer is suspended in the thermally conductive liquid.

4. A light-emitting diode (LED) bulb comprising:

a base;

a shell connected to the base;

at least one LED;

a thermally conductive liquid held within the shell, wherein the LED is immersed in the thermally conductive liquid; and

a liquid displacer immersed in the thermally conductive liquid, wherein the liquid displacer is configured to be compressible, wherein the liquid displacer is compressed in response to expansion of the thermally conductive liquid, and wherein the liquid displacer is not attached to other components or structures of the LED bulb.

5. A light-emitting diode (LED) bulb comprising:

a base;

a shell connected to the base;

a plurality of LEDs arranged in a radial configuration;

a thermally conductive liquid held within the shell, wherein the LEDs are immersed in the thermally conductive liquid; and

a liquid displacer immersed in the thermally conductive liquid, wherein the liquid displacer is configured to be compressible, wherein the liquid displacer is compressed in response to expansion of the thermally conductive liquid, wherein the liquid displacer is an elastic bladder, and wherein the liquid displacer is suspended in the thermally conductive liquid.

6. A light-emitting diode (LED) bulb comprising:

a base;

a shell connected to the base;

a plurality of LEDs arranged in a radial configuration;

a thermally conductive liquid held within the shell, wherein the LEDs are immersed in the thermally conductive liquid; and

a liquid displacer immersed in the thermally conductive liquid, wherein the liquid displacer is configured to be compressible, wherein the liquid displacer is compressed in response to expansion of the thermally conductive liquid, wherein the liquid displacer is an elastic bladder, wherein the liquid displacer is suspended in the thermally conductive liquid, and wherein the liquid displacer is not attached to other components or structures of the LED bulb.

7. A light-emitting diode (LED) bulb comprising:

a base;

a shell connected to the base;

a plurality of LEDs arranged in a radial configuration;

a thermally conductive liquid held within the shell, wherein the LEDs are immersed in the thermally conductive liquid; and

a liquid displacer immersed in the thermally conductive liquid, wherein the liquid displacer is configured to be compressible, wherein the liquid displacer is compressed in response to expansion of the thermally conductive liquid, wherein the liquid displacer is configured as bellows, and wherein the liquid displacer is suspended in the thermally conductive liquid.

8. A light-emitting diode (LED) bulb comprising:

a base;

a shell connected to the base;

a plurality of LEDs arranged in a radial configuration;

a thermally conductive liquid held within the shell, wherein the LEDs are immersed in the thermally conductive liquid; and

a liquid displacer immersed in the thermally conductive liquid, wherein the liquid displacer is configured to be compressible, wherein the liquid displacer is compressed in response to expansion of the thermally conductive liquid, wherein the liquid displacer is configured as bellows, wherein the liquid displacer is suspended in the thermally conductive liquid, and wherein the liquid displacer is not attached to other components or structures of the LED bulb.