This patent application has not been assigned to a company or institution.
The following quote was obtained by the news editors from the background information supplied by the inventors: "Various illumination optical systems are currently proposed as the illumination optical system used in a projector such as an LED (Liquid Crystal Display) projector or a DLP (Digital Light Processing) projector.
"Japanese Unexamined Patent Application Publication No. 2010-237443 (hereinbelow referred to as Patent Document 1) and Japanese Unexamined Patent Application Publication No. 2010-256457 (hereinbelow referred to as Patent Document 2) disclose illumination optical systems and projectors in which a fluorophore is irradiated by an excitation light to obtain light emission of a predetermined wavelength band from a fluorophore.
"The illumination optical system (light source device) disclosed in each of these patent documents is equipped with a light source that irradiates laser light of the blue wavelength band and a light-emitting wheel on which is provided a light-emitting substance that emits light with light irradiated from the light source as excitation light. The light-emitting wheel is provided with: a red region in which a light-emitting substance is provided that emits light of the red wavelength band when excited by light from the light source, a green region in which a light-emitting substance is provided that emits light of the green wavelength band, and a blue region that transmits light of the blue wavelength band. The light-emitting substances of the light-emitting wheel are formed on a reflection layer.
"The light-emitting wheel is configured so as to be rotatable. Due to the rotation of the fluorophore wheel, blue light that is emitted from the light source successively irradiates the red region, the green region, and the transmission region of the light-emitting wheel. The red light and green light generated from the fluorophores are reflected by the reflection layer.
"Red light and green light that are reflected by the reflection layer and blue light that is transmitted by the transmission region are combined by a dichroic mirror or relay optical system.
"The combined light is irradiated upon a digital mirror device (DMD). Light of each color that is emitted in time divisions by the light-emitting wheel is spatially modulated according to input images by the DMD and projected by way of a projection lens onto a screen.
"Literature of the Prior Art
"Patent Document 1: Japanese Unexamined Patent Application Publication No. 2010-237443
"Patent Document 2: Japanese Unexamined Patent Application Publication No. 2010-256457"
In addition to the background information obtained for this patent application, VerticalNews journalists also obtained the inventor's summary information for this patent application: "Technical Problem
"In the case of the illumination optical systems described in Patent Document 1 and Patent Document 2, the light path of blue light differs from the light path of red light and green light.
"This difference occurs because the blue light is transmitted through the fluorophore wheel while the red light and green light are reflected by the fluorophore wheel. As a result, the optical system through which the blue light passes differs from the optical system through which the red light and green light pass.
"In order for the blue light and red and green light that pass over different light paths to be emitted from the illumination optical system in the same direction, an optical system is absolutely necessary that combines the light paths of the light of each color. The problem therefore arises in which the size of the illumination optical system increases or in which the number of optical parts that make up the illumination optical system increases.
"A compact illumination optical system having few optical parts is therefore desired in the illumination optical system that includes a fluorophore that produces fluorescent light by the irradiation of excitation light."
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