Projection type image display apparatus
AssigneeKonica Minolta Opto, Inc.
InventorsTomokazu Masubuchi, Atsushi Matsuura, Satoshi Onishi, Kohei Wataru, Takashi Ohta
Life of this patent
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Abstract
A projection type image display apparatus has: an illumination optical system generating illumination light; a projection optical system projecting an image light onto a screen; a digital micromirror device (DMD) modulating the illumination light so as to form the image light; and a reflection mirror arranged in a position opposite to an optical path of the illumination light entering the DMD. The reflection mirror reflects an off-light reflected by the DMD in an “OFF” state in a direction separated from a projection light reflected by the DMD in an “ON” state.
Claims20
A projection type image display apparatus comprising:
- an illumination optical system generating an illumination light;
- a projection optical system projecting an image light onto a screen;
- a reflection type image forming device modulating the illumination light so as to form the image light, the reflection type image forming device having an image forming surface on which a plurality of micromirrors are arranged two-dimensionally, a rotational angle of the micromirrors being set to at least one of first and second angles according to a picture signal input into the reflection type image forming device, the micromirrors reflecting the illumination light in a first direction where the light is led to the screen via the projection optical system at the first angle and reflecting the illumination light in a second direction where the light is not led to the screen at the second angle;
- and
- a reflection mirror arranged in a position opposite to an optical path of the illumination light to enter the reflection type image forming device across an optical path of the image light reflected in the first direction by the micromirrors at the first angle, the reflection mirror reflecting the light reflected in the second direction by the micromirrors at the second angle in a direction separated from the image light.
An projection type image display apparatus comprising:
- a projection optical system projecting an image light onto a screen;
- an optical component holding member holding at least one optical component of the projection optical system;
- a reflection type image forming device separating an illumination light into the image light to be projected onto the screen and the other unnecessary light according to an input signal thereto;
- and
- a reflection element for reflecting the unnecessary light arranged in a space between the reflection type image forming device and the projection optical system.
An projection type image display apparatus comprising:
- a projection optical system projecting an image light onto a screen;
- an optical component holding member holding at least one optical component of the projection optical system;
- a digital micromirror device separating an illumination light into the image light to be projected onto the screen and the other unnecessary light according to an input signal thereto;
- and
- a reflection mirror arranged in a space between the digital micromirror device and the projection optical system, and reflecting the unnecessary light in a direction which crosses an optical path of the image light.
Dependencies are inferred from the claim text.