The assignee for this patent, patent number 8783886, is
Reporters obtained the following quote from the background information supplied by the inventors: "The present invention provides an illumination system, and more particularly, to an illumination system which is for use in a projection device, has less optical components and can improve the light combining efficiency.
"Because solid light sources such as lasers and light emitting diodes (LEDs) have advantages, such as saving energy, a high light-emitting efficiency, a concentrated luminance and a long service life, the use of the solid light sources as light sources of projection devices has received much attention in the art. In U.S. Patent Publication No. US 2009/0262308, a light source unit and a projector 10 are disclosed. As shown in FIG. 1, the light source unit 63 has a red LED 161R, a green LED 161G and a blue LED 161B, and light beams are combined through a plurality of condensing lenses 164 disposed adjacent to the LEDs 161R, 161B and 161G respectively. It shall be noted that the light source unit 63 has to condense the light beams through the condensing lenses 164 disposed adjacent to the LEDs 161R, 161B and 161G to combine the light beams; therefore, in this U.S. Patent Publication, the light source unit 63 has to be provided with a large number of optical components, which increases the weight of the light source unit 63. Moreover, sufficient space is needed in the projector 10 to accommodate the light source unit 63. Consequently, this type of light source unit is limited by the volume and is unsuitable for use in a miniaturized projector.
"In view of this, an urgent need exists in the art to provide a solution that can effectively arrange a plurality of light sources and optical components in a projector so that the light-emitting efficiency is improved while the volume and the weight of the light emitting source can still be effectively reduced."
In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventor's summary information for this patent: "An objective of the present invention is to provide an illumination system in which, by skillfully arranging the individual light sources and optical components, the number of optical components to be used and the volume of the illumination system are reduced and the light combining efficiency of the illumination system is increased.
"To achieve the aforesaid objective, an illumination system according to an embodiment of the present invention comprises a first light source, a second light source, a third light source, an optical device, a wavelength transformer and a first dichroic mirror. The first light source and the second light source emit a first light beam and a second light beam respectively. The optical device defines a main optical axis and focuses the first light beam and the second light beam onto a first focal point and a second focal point respectively. In addition, the first focal point and the second focal point are disposed on two opposite sides of the main optical axis respectively. The first dichroic mirror is disposed between the light sources and the optical device, and is adapted to allow the first light beam, the second light beam and the fourth light beam to travel therethrough and to reflect the third light beam. The first and the fourth light beams are focused into the first focal point. The second light beam is focused into the second focal point. The wavelength transformer is disposed at the second focal point and transforms the second light beam into a third light beam. The third light beam emitted from the second focal point then sequentially passes through the optical device, and is then reflected by the first dichroic mirror to the optical device to be focused on the first focal point.
"The detailed technology and preferred embodiments implemented for the subject invention are described in the following paragraphs accompanying the appended drawings for people skilled in this field to well appreciate the features of the claimed invention."
For more information, see this patent: Huang, June-Jei. Illumination System. U.S. Patent Number 8783886, filed
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