Optics: image projectors – Polarizer or interference filter
Reexamination Certificate
2000-10-20
2003-05-20
Adams, Russell (Department: 2851)
Optics: image projectors
Polarizer or interference filter
C353S031000, C353S033000, C353S034000, C353S037000, C353S038000, C353S097000, C349S007000, C349S009000
Reexamination Certificate
active
06565211
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of Japanese Patent Application No. 11-301304 filed Oct. 22, 1999, the disclosure of which is incorporated herein by reference.
DETAILED DESCRIPTION OF THE INVENTION
1. Field of the Invention
The present invention relates to a projection type display device, which, modulating light incident on light valves, projects the light.
2. Description of the Related Art
The full color type of projection type display device of Japanese Patent Application No. 2505758 is known as an example of a prior art projection type display device.
Moreover, it is known to use a fly's eye integrator as an illuminating device of a light valve of a projection type display device. Nevertheless, when a fly's eye integrator was simply applied to a projection type display device, uniform illumination of the light valves was attained, but there were problems of reduced contrast and non-uniformity in the projected image. Moreover, there were problems of low degree of design freedom from the large size of the device.
SUMMARY OF THE INVENTION
The present invention has as its object to provide a projection type display device having increased contrast and reduced non-uniformity of the projected image in comparison with the prior art devices. Moreover a particular object of the present invention is to provide a small sized device having a high degree of design freedom in comparison with the prior art devices.
In order to solve the above problems, the first exemplary projection type display device has a secondary light source image forming optical system
202
,
203
that forms plural secondary light source images from light emitted from a light source, and a polarized light separating optical system
206
which polarization separates a first polarized light component of light emitted from said plural secondary light source images, and a color separating optical system
207
A,
207
B,
207
C which separates into plural colors, the first polarized light component emitted from said polarized light separating system
206
and emits these, and, respectively arranged for each color light emitted from said color separating optical system
207
A,
207
B,
207
C, plural reflecting type light valves
208
which modulate, based on image information, the first polarized light component to a second polarized light component, and a color synthesizing optical system
207
A,
207
B,
207
C which color synthesizes and emits modulated lights respectively emitted from the plural reflecting type light valves
208
, and an analyzing optical system
206
which analyzes said second polarized light component from light emitted from the color synthesizing optical system
207
A,
207
B,
207
C, and a condenser lens
204
which causes the condensing of light beam fluxes emitted from the plural secondary light source images, and also causes the superposition, on the whole surface of respective plural reflection type light valves
208
, of the light beam fluxes respectively emitted from said plural secondary light source images, and, arranged between said plural secondary light source images and said plural reflecting type light valves
208
, a field lens
205
which converts into a parallel light beam flux the light beam flux emitted from the predetermined point of said plural secondary light source images: the polarized light separating optical system
206
, and the plural reflecting type light valves
208
, and the analyzing optical system
206
, are arranged in the parallel light beam flux converted by means of the field lens
205
.
Another projection type display device is the first exemplary projection type display device noted above, having a projection type optical system
209
a
,
209
b
which projects images of the plural reflection type light valves
208
, and an aperture stop
209
c
which sets the numerical aperture of the reflected light emitted from the plural light valves
208
; by means of the lens
209
a
toward the plural reflecting type light valves
208
within the projection optical system
209
a
,
209
b
, arid of the field lens
205
, the predetermined point and the central portion of the aperture stop
209
c
are in a conjugate relationship.
Another projection type display device is the first exemplary projection type optical system noted above, having a projection optical system
209
a
,
209
b
which projects images of the plural reflecting type light valves
208
, and an aperture step
209
c
which sets the numerical aperture of the reflected light emitted from said plural light valves
208
; the principal rays defined by the aperture stop
209
c
are parallel with respect to the optical axis extending at right angles to the center of the plural reflecting type light valves
208
, in a position in which the light beam flux emitted from the predetermined point of the plural secondary light source images becomes a parallel light beam flux by means of the field lens
205
.
Another projection type display device is the first exemplary projection type display device noted above where the plural reflecting type light valves
208
are arranged in a position of optical path length of air equivalent length about (f
1
(f
2
−f
1
))/f
2
from the a field lens
205
(where f
1
is the focal length of the field lens, f
2
is the local length of the condenser lens).
Another projection type display device is the first exemplary projection type optical system noted above, where the secondary light source forming optical system includes a fly's eye integrator
202
,
203
. Another projection type display device is the first exemplary projection type display device noted above, where the fly's eye integrator
202
,
203
′ comprises a first lens plate
202
with plural first lens components
202
a
in a planar configuration, and a second lens plate
203
′, having plural second lens components
203
′
a
respectively arranged in focal positions of said plural first lens components
202
a
disposed corresponding to the first lens plate
202
, the plural second light source images being formed by the plural second lens components
203
′
a
; the second lens plate
203
′ conjointly has the function of the condenser lens.
Another projection type display device is the first exemplary projection type display device noted above, where the secondary light source forming optical system includes a rod integrator
520
and a relay lens
521
. Another projection type display device is the first exemplary projection type display device noted above, where the function of the field lens and the function of the condenser lens are combined by means of one conjointly used optical system
104
.
A second exemplary projection type display device has a secondary light source forming optical system
102
,
103
which forms plural secondary light source images on a predetermined surface from light emitted from a light source, and light valves
108
which modulate, based on image information, and emit light emitted from said plural secondary light source images, and a conjoint use optical system
104
combining the function of a condenser lens which is arranged between the plural secondary light source images and the light valves
108
, which causes condensation of the light beam fluxes emitted from the plural secondary light source images, and which causes superposition in the light valves
108
whole surface of light beam fluxes emitted from the plural secondary light source images, and the function of the field lenses which convert to a parallel light beam flux, the light beam flux emitted from the predetermined point of the plural secondary light source images.
Another projection type display device is the second exemplary projection type display device noted above, where a projection optical system
109
a
,
109
B which projects an image of the light valves
108
, and an aperture stop
109
C which sets the numerical aperture of light emitted from the light valves
108
; by means of the lens on the light valve
108
side within
Hattori Tetsuo
Manabe Yuji
Sekine Atsushi
Adams Russell
Cruz Magda
Nikon Corporation
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