Cooling for a lamp assembly

Patent metadata

Field	Value
Publication number	US-11227738-B2
Application number	US-201716075596-A
Country	US
Kind code	B2
Filing date	Apr 21, 2017
Priority date	Apr 21, 2017
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

An apparatus, system, and method for cooling a lamp assembly is described herein. The apparatus includes an air channel and an axial slot. A flow of air is injected into the air channel of a lamp housing, wherein the lamp housing comprises at least a bulb. The axial slot is located in a reflector housing and has dimensions that enable a constant flow of air through the slot and across the bulb when a predetermined air flow is input to the air channel.

First claim

What is claimed is:

1. An apparatus for cooling a lamp assembly, comprising:
an air channel, wherein a flow of air is injected into the air channel of a lamp housing having an open end and a closed end opposite the open end, wherein the lamp housing comprises at least a bulb; and
an axial slot, wherein the axial slot is sized based on the air flow to enable a constant flow of air through the axial slot and across the bulb; and
wherein air is input into the air channel through the open end of the lamp housing and forced through the axial slot, across the bulb, and back out through the open end of the housing.

2. The apparatus of claim 1 , wherein the axial slot is located at the top of a reflector housing.

3. The apparatus of claim 1 , wherein the axial slot is located at the bottom of a reflector housing.

4. The apparatus of claim 1 , comprising a selective restrictor as a distal end of the axial slot, wherein the selective restrictor restricts the flow of air to achieve a particular temperature response.

5. The apparatus of claim 1 , wherein the bulb is a quartz-tungsten-halogen (QTH) bulb.

6. The apparatus of claim 1 , wherein the axial slot is sized to maintain a uniform temperature across the bulb.

7. A method for cooling a lamp assembly, comprising:
injecting a flow of air into an air channel through an open end of a lamp housing, wherein the lamp housing comprises at least a bulb;
directing the flow of air against a closed end of the lamp housing opposite the open end, through an axial slot, across the bulb, and back out through the open end of the lamp housing, the axial slot sized, based on the air flow, to enable a constant flow of air through the slot and across the bulb; and
guiding the flow of air away from the bulb.

8. The method of claim 7 , wherein the at least one axial slot is sized to reduce a pressure gradient used to drive the flow of air.

9. The method of claim 7 , wherein the at least one axial slot is sized to generate a flat temperature response.

10. The method of claim 7 , wherein the air flow at the distal end of the axial slot is selectively restricted to enable a temperature response that is slightly warmer at each end of the lamp tube.

11. The method of claim 7 , wherein the axial slot occurs at a top of a reflector that surrounds the lamp tube.

12. The method of claim 7 , wherein the axial slot occurs at a lower edge of a reflector that surrounds the lamp tube.

13. The method of claim 7 , wherein the axial slot occurs along a reflector at a location that minimally affects illumination.

14. A system for cooling a lamp assembly, comprising:
a lamp tube that generates heat;
a reflector to direct light produced by the lamp tube, wherein the reflector includes a least one axial slot;
an air channel that directs an air flow from an open end of the assembly, against a closed end of the assembly opposite the open end, across the lamp tube via the axial slot, and back out through the open end of the assembly, wherein the size of the axial slot is based on the air flow; and
a second air channel to guide hot air away from the lamp tube.

15. The system of claim 14 , wherein the axial slot is sized to generate a flat temperature response from the lamp tube.

Assignees

• Hewlett Packard Development Co

Inventors

• Carbone Kevin
• Post Alvin Marion

Classifications

• H01J7/26 Primary

  by flow of fluid through passages associated with tube or lamp · CPC title

• H01K1/58

  Cooling arrangements · CPC title

• B33Y30/00

  Apparatus for additive manufacturing; Details thereof or accessories therefor · CPC title

• B29C64/295 Primary

  Heating elements · CPC title

• F21V29/503

  of light sources (cooling arrangements structurally associated with gas-discharge or vapour-discharge lamps H01J61/52; cooling arrangements structurally associated with electric incandescent lamps H01K1/58; cooling arrangements structurally associated with light-emitting diodes H10H20/858) · CPC title