News Column

Patent Issued for Illumination Optical System and Image Display Apparatus

September 3, 2014



By a News Reporter-Staff News Editor at Journal of Engineering -- Sony Corporation (Tokyo, JP) has been issued patent number 8810740, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventors are Taketsu, Iori (Saitama, JP); Kita, Koji (Kanagawa, JP); Ono, Tomoki (Kanagawa, JP); Kita, Tetsuya (Kanagawa, JP).

This patent was filed on June 26, 2012 and was published online on August 19, 2014.

From the background information supplied by the inventors, news correspondents obtained the following quote: "The present technique relates to an illumination optical system and an image display apparatus.

"Front projectors (projection apparatuses) are a type of image display apparatus. A front projector includes a discharge lamp, which is used as a light source, and a reflective liquid crystal display device, a transmissive liquid crystal device, or a digital micromirror device (DMD), which is used as a light modulation device. Various improvements have been made in the devices and optical systems.

"Recently, the use of laser as a new light source of an image display apparatus has been proposed. A laser beam is emitted from a significantly small emitting region. The luminance of the beam is highest at the center and rapidly decreases toward the periphery of the emitting region, developing a luminance distribution that is substantially a Gaussian distribution. Thus, the light from illumination optical systems that include laser devices as light sources can be used as illumination with a uniform distribution only when the luminance is made uniform. Such illumination optical systems have been proposed (for example, refer to Japanese Unexamined Patent Applications Publication Nos. 2006-5015 and 2009-192789)."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "The proposed illumination optical systems are one-dimensional laser-array light sources and disadvantageous in that their size is increased as a result of the increased number of devices for generating a large amount of light.

"The present technique has been conceived in light of such circumstances and provides an illumination optical system and an image display apparatus having an illumination optical system, the illumination optical system being small in size even when the number of included devices, i.e., light sources, is increased.

"To solve the problem described above, an illumination optical system includes a two-dimensional laser-array light source, an integrator optical system, a plurality of first lenses, and a plurality of second lenses. The two-dimensional laser-array light source includes a plurality of laser light sources arranged in a two-dimensional array on a plane. The integrator optical system is configured to superpose incident light and emit the light to an irradiated surface. The plurality of first lenses is disposed parallel to the plane and is configured to superpose beams from the two-dimensional laser-array light source in a first axis direction and emit the beams to the integrator optical system while limiting a divergence angle in the first axis direction of the two-dimensional array. The plurality of second lenses is disposed rearward of the first lenses and is configured to superpose the beams from the two-dimensional laser-array light source in a second axis direction orthogonal to the first axis direction and emit the beams to the integrator optical system while limiting a divergence angle in the second axis direction.

"To solve the problem described above, an image display apparatus includes a light modulation device, a two-dimensional laser-array light source, an integrator optical system, a plurality of first lenses, and a plurality of second lenses. The two-dimensional laser-array light source includes a plurality of laser light sources arranged in a two-dimensional array on a plane. The integrator optical system is configured to superpose incident light and emit the light to the light modulation device. The plurality of first lenses is disposed parallel to the plane and is configured to superpose beams from the two-dimensional laser-array light source in a first axis direction and emit the beams to the integrator optical system while limiting a divergence angle in the first axis direction of the two-dimensional array. The plurality of second lenses is disposed rearward of the first lenses and is configured to superpose the beams from the two-dimensional laser-array light source in a second axis direction orthogonal to the first axis direction and emit the beams to the integrator optical system while limiting a divergence angle in the second axis direction.

"The illumination optical system and image display apparatus described above have a small illumination optical system even with an increased number of devices, which are the light sources."

For the URL and additional information on this patent, see: Taketsu, Iori; Kita, Koji; Ono, Tomoki; Kita, Tetsuya. Illumination Optical System and Image Display Apparatus. U.S. Patent Number 8810740, filed June 26, 2012, and published online on August 19, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8810740.PN.&OS=PN/8810740RS=PN/8810740

Keywords for this news article include: Sony Corporation.

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Source: Journal of Engineering


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