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IR-Block lamp using IR selective optical elements Disclosure Number: IPCOM000010554D
Publication Date: 2002-Dec-17
Document File: 3 page(s) / 55K

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IR-Block lamp using IR selective optical elements

1     Abstract

An IR-Block radiation (IR = infrared) is generated by means of diffuse[1] selective scattering of IR radiation while leaving the wanted part (e. g. light) unchanged. After diffusing of the IR the optical system is "out of focus" for IR because the diffusor is acting as new source with the result that the IR radiation is randomly directed and lost.

2     Introduction

Typical incandescent lamps emit more than 90% of the power consumed as IR radiation. For many applications this is disturbing. Cool beam reflector lamps using a dichroic mirror and IR filters are frequently used to eliminate unwanted IR radiation. Within this invention some design principles are presented how this IR-Block effect might be achieved which extend the status quo. The IR-Block effect is recently used in the Japanese market for "C1b"-type lamps (description of code below).

3     Application

IR-Block for lamps is used in all kinds of applications. The effect is most interesting for focused beams and optical systems used for accent lighting, fibre optics and medical lighting.

4     Starting-point

Subsequently, the different aspects of IR-Block will be discussed also taking into account the status quo.

1. Parameter: Physical treatment of the IR radiation:

A          Diffusion: diffuse selective scattering of IR radiation. This is comparable with the visual effect of frosted lamps now applied selectively to IR.

B          Reflection to absorption: selective reflection of IR with subsequent absorption (e. g. by coil).

C          Reflection to diffusion: selective reflection of IR with subsequent diffuse emission (e. g. due to higher orders of incidence on filter with transmission coefficient >0).

D          Absorption: selective absorption of IR.

2. Parameter: Design part causing of selective IR-Block:

1               Coating on lamp bulb surface.

2               Coating on lamp reflector surface.

3               Lamp glass characteristics.

4               Filter outside lamp.

3. Parameter: Effect achieved by IR-Block:

a               IR-elimination: lower amount of IR radiation relative to visible radiation emitted.

b               IR-redirection: IR part of radiation outside used radiation part.

To explain the above parameters better, one example is given in detail. A typical cool beam MR16 dichroic reflector lamp represents the design "C2b". A reflector that reflects the visible radiation is transparent for the IR radiation. Therefore within the used beam the IR is missing due to a relatively isotropic emission without the reflector effect. IR and visual radiation are decoupled.

The following table gives the well-known combinations.

lamp family

design principle


cool beam reflector lamps


accent lighting, p...