US 6,142,634 A · Projector

Abstract

A projection-type display apparatus in accordance with the invention reduces the margin formed around the image forming range of the light valves, and forms a bright projected image. Emitted light from a light source lamp unit of a projection-type display apparatus illuminates liquid crystal light valves of each color via an integrator optical system. First and second lens plates of an integrator optical system that serves as a uniform illuminating optical system are disposed such that the attachment position thereof is capable of fine adjustment in a direction vertical to the optical axis. By performing fine adjustment of the attachment position of these, the forming position of the illumination range B can be adjusted to include the image forming range A of the liquid crystal light valves. Accordingly, there is no need to provide a wide margin around the image forming range A, taking shifting of the forming position of the illumination range B into consideration. Thus, efficient usage of the illumination light can be increased, thereby improving the brightness of the projected image.

Claims21

Dependent claims

A projector having an optical axis, comprising:

a light source emitting light flux;
a modulating device for modulating the light flux emitted from said light source in accordance with image signals;
projecting lens unit for performing enlarged projection of said light flux modulated by said modulating device upon a projection surface;
a first lens plate and a second lens plate, each of which include a plurality of lenses arrayed in matrix-form disposed in the optical path between said light source and said modulating device;
wherein at least one of said first and second lens plates is arranged so that any attachment position thereof is adjustable in a direction intersecting the optical axis.

2 more elements

A projector having an optical axis, comprising:

a light source emitting light fluxes;
a first optical component for splitting the emitted light fluxes from said light source into a plurality of intermediate light fluxes, the intermediate light fluxes being focused at a position;
a second optical component disposed in proximity to the position at which said intermediate light fluxes are focused;
a modulating device for modulating the light flux emitted from said second optical component;
and
projecting lens unit for performing enlarged projection of said light flux modulated by said modulating device upon a projection surface;
wherein said second optical component includes:
a focusing lens array for focusing each of the plurality of intermediate light fluxes split by said first optical component;
a polarization converting device which spatially splits each of the plurality of intermediate light fluxes focused by said focusing lens array into P-polarization light flux and S-polarization light flux, and emits the P-polarization light flux and S-polarization light flux with the polarization direction of one matching the polarization direction of the other;
and
a combining lens for superimposing the light fluxes emitted from said polarization converting device;
and
wherein at least one of the first optical component and second optical component is arranged so that an attachment position thereof is adjustable in a direction intersecting the optical axis.

10 more elements

A projector having an optical axis, comprising:

a light source emitting light fluxes;
a first optical component for splitting the emitted light fluxes from said light source into a plurality of intermediate light fluxes, the intermediate light fluxes being focused at a position;
a second optical component placed in proximity to the position at which said intermediate light fluxes are focused, said second optical component including:
a focusing lens for focusing each of the plurality of intermediate light fluxes split by said first optical component;
a polarization converting device which spatially splits each of the plurality of intermediate light fluxes focused by said focusing lens array into P-polarization light flux and S-polarization light flux, and emits the P-polarization light flux and S-polarization light flux with the polarization direction of one matching the polarization direction of the other;
and a combining lens for superimposing the light fluxes emitted form said polarization converting device;
modulating device for modulating light flux emitted form said second optical component;
projecting lens unit for performing enlarged projection of said light flux modulated by said modulating device upon a projection surface;
and
an adjusting mechanism for adjusting an attachment position of at least one of the first optical component and second optical component in a direction intersecting the optical axis.

7 more elements

Dependencies are inferred from the claim text.

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Abstract

Claims21