Title:
LIGHT SOURCE DEVICE AND PROJECTION IMAGE DISPLAY DEVICE
Document Type and Number:
Japanese Patent JP2018194819
Kind Code:
A
Abstract:
To provide a light source device that prevents luminance unevenness and speckle noise in a projected image even when a laser light source is used, and a projection display device using the light source device.SOLUTION: The light source device of the present invention includes a solid-state light source unit, a dichroic mirror, a fluorescent plate, a first retardation plate, and a multi-reflection mirror. The solid-state light source unit emits two linearly polarized light rays at a predetermined ratio, the two linearly polarized light rays being orthogonal to each other. The dichroic mirror separates the two linearly polarized light rays, and combines blue light with yellow light. The fluorescent plate is excited by a first linearly polarized light ray separated from the two linearly polarized light rays and emits the yellow light to the dichroic mirror. The first retardation plate converts a second linearly polarized light ray separated from the two linearly polarized light rays into circularly polarized light. The multi-reflection mirror reflects the circularly polarized light converted by the first retardation plate toward the dichroic mirror as the blue light.SELECTED DRAWING: Figure 5
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Inventors:
OKUNO MANABU
TANAKA TAKAAKI
TANAKA TAKAAKI
Application Number:
JP2018029692A
Publication Date:
December 06, 2018
Filing Date:
February 22, 2018
Export Citation:
Assignee:
PANASONIC IP MAN CORP
International Classes:
G03B21/14; F21S2/00; F21V3/00; F21V7/28; F21V9/14; F21V9/30; G03B21/00; H04N5/74
Domestic Patent References:
| JP2012137744A | 2012-07-19 | |||
| JP2016145965A | 2016-08-12 | |||
| JP2018013764A | 2018-01-25 | |||
| JP2015227916A | 2015-12-17 | |||
| JP2013250494A | 2013-12-12 | |||
| JP2016180818A | 2016-10-13 |
Foreign References:
| WO2015151180A1 | 2015-10-08 | |||
| WO2016143274A1 | 2016-09-15 |
Attorney, Agent or Firm:
Kenji Kamada
Hiroo Maeda
Hiroo Maeda