The patent's inventors are Miyazaki,
This patent was filed on
From the background information supplied by the inventors, news correspondents obtained the following quote: "The present invention relates to a light source unit which utilizes laser for a light source and a projector which includes the light source unit.
"In these days, data projectors are used in many cases as image projection apparatuses which project images including video images shown on screens of personal computers on to a screen, and the data projectors further read out image data or dynamic image data stored in memory cards for projection on to the screen. These projectors are such that light emitted from a light source is concentrated on a micromirror device called a DMD (Digital Micromirror Device) or a liquid crystal plate for display of a color image on the screen.
"In projectors of the type described above, conventionally, projectors using a high-intensity discharge lamp as a light source have been the mainstream of projectors. In recent years, however, there have been made many developments and proposals on light source units which utilize as a light source a light emitting diode or a laser diode, or devices utilizing organic EL technology or luminescence technology using luminescent materials. For example, a light source unit described in Japanese Unexamined Patent Publication No. 2004-341105 (JP-A-2004-341105) includes a luminescent wheel which is made up of a disc-shaped transparent base material on which a luminescent material layer is disposed and a solid-state light source which emits ultraviolet light, and the luminescent wheel is described as converting ultraviolet light received into visible light. In the light source unit described in JP-A-2004-341105, ultraviolet light is shone on to the luminescent material layer formed on the luminescent wheel as excitation light, so that luminescent light having red, green and blue wavelength bands can be emitted.
"However, since the light emitting efficiency of the red luminescent material is remarkably lower than those of the other luminescent materials, there has been caused a problem that the luminance of red becomes insufficient."
Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "The invention has been made in view of the problem inherent in the related art and an object thereof is to provide a light source unit including a luminescent wheel having a luminescent material of a kind having a good light emitting efficiency, a light source for exciting the luminescent material, and a single-color light source for emitting light having a corresponding wavelength band to a luminescent material of a kind having a relatively low light emitting efficiency to thereby increase a luminance of a screen, and a projector including this light source.
"According to a preferred aspect of the invention, there is provided a light source unit including: a light emitting plate which has a plurality of segment areas and in which a luminescent material layer which emits light having a predetermined wavelength band by receiving excitation light and a transmissive portion which transmits light are formed on at least the plurality of segment areas; a primary light source for emitting excitation light on to the luminescent material; a secondary light source for emitting light having a wavelength band which differs from those of luminescent light emitted from the luminescent material layer and excitation light emitted from the primary light source; a light guiding optical system for guiding light emitted from the light emitting plate and light emitted from the secondary light source to the same optical path; and a light source control means for controlling the emission of light from the primary light source and the secondary light source.
"Namely, the light source unit is provided which can emit highly luminous light of a plurality of colors, and the light source unit can emit such light while time-sharing the plurality of colors. Then, by making the light source unit into a light source unit which emits at least light of the three primary colors, the resulting light source unit can be suitable for optical equipment such as a projector.
"In addition, according to another preferred aspect of the invention, there is provided a projector having the light source unit described above. By being equipped with the light source unit, although it is small in size, the projector can be made into a projector which can project an image which is bright and superior in tone."
For the URL and additional information on this patent, see: Miyazaki,
Keywords for this news article include: Technology,
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