Light-source device and projection type display device

• US 6,631,997 B2
• Filed: 06/13/2001
• Issued: 10/14/2003
• Est. Priority Date: 06/14/2000
• Status: Expired due to Term

• Current Assignee: Rakuten Group, Inc.
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Miyata, Akihisa, Shikama, Shinsuke, Okamori, Shinji
• Primary Examiner(s): Adams, Russell
• Assistant Examiner(s): SEVER, ANDREW T
• Application Number:
  US09/878,992
• Publication Number:
  US 20020036833A1
• Time in Patent Office: 853 Days
• Field of Search: 353/75, 353/79, 353/31, 353/97
• US Class Current: 353/97
• CPC Class Codes: G02B 26/0841 the reflecting element being moved or deformed by electrostatic means
• CPC Class Codes: H04N 5/7458 the modulator being an array of deformable mirrors, e.g. digital micromirror device [DMD]
• CPC Class Codes: H04N 9/3102 using two-dimensional electronic spatial light modulators micromechanical modulators as such G02B26/0833; liquid crystal modulators as such G02F1/13

Abstract

A light-source device comprising: a rod integrator having an injection end and an emitting end; a lens unit for collecting a luminous flux emitted from the emitting end; and, a diaphragm. The rod integrator forms a plurality of imaginary light-source points, each of which virtually emits the luminous flux toward the emitting end. The diaphragm is disposed in the vicinity of a plane on which the lens unit forms the images of the imaginary light-source points, and selectively blocks luminous flux emitted from each of the images of the imaginary light-source points.

Claims

1. A light-source device comprising:

a first lens unit for condensing light emitted by a lamp;

a rod integrator having an injection end and an emitting end, the injection end being disposed in the vicinity of a convergence point of the light condensesd by the first lens, the rod integrator forming a plurality of imaginary light-source points each of which virtually emits the luminous flux to the emitting end

a second lens unit for forming the images of the imaginary light source points and

a diaphragm being disposed in the vicinity of a plane on which the images of the imaginary light-source points are formed, the diaphragm having an aperture which is shaped so that the diaphragm selectively blocks an image of an imaginary light-source point emitting undesirable light components.

2. A light-source device of claim 1, wherein the second lens unit comprises afocal lens system.

3. A projection type display device comprising a light-source device of claim 1,

a light valve means being disposed in the vicinity of a plane on which the second lens unit form an image of the emitting end, and

a projection means for projecting an image formed by the light valve means onto a screen.

4. A projection type display device of claim 3, wherein the projection means comprises a condenser lens and a projection lens, the condenser lens which re-forms images of the imaginary light-source points in the vicinity of an entrance pupil of the projection lens.

5. A projection type display device of claim 3, wherein the cross-sectional shape of the emitting end of the rod integrator is analogous to that of the light valve means.

6. A projection type display device comprising:

a first lens unit for condensing light emitted by a lamp;

a rod integrator having an injection end being disposed in the vicinity of a convergence point of the light condensed by the first condenser lens and an emitting end, the rod integrator forming a plurality of imaginary light-source points each of which virtually emits the luminous to the emitting end;

a second lens unit for forming images of the imaginary light-source points;

a diaphragm being disposed in the vicinity of a plane on which the images of the imaginary light-source points are formed, the diaphragm selectively blocks luminous flux emitted from each of the images of the imaginary light-source points;

a light valve means being disposed in the vicinity of a plane on which the second lens unit form an image of the emitting end, the light valve means having a plurality of mirrors forming mirror array each of which reflects light in a first direction or in a second direction, the light valve means which forms images with the light reflected in the first direction; and

,

a projection means for projecting the images formed by the light valve means onto a screen.

7. A projection type display device of claim 6, wherein the diaphragm blocks a luminous flux to enter into the projection means after being reflected from a cover glass disposed in front of the light valve means.

8. A projection type display device comprising:

a first lens unit for condensing light emitted by a lamp;

a rod integrator having an injection end being disposed in the vicinity of a convergence point of the light condensed by the first condenser lens and an emitting end, the rod integrator forming a plurality of imaginary light-source points each of which virtually emits the luminous to the emitting end;

a second lens unit for forming images of the imaginary light-source points;

a diaphragm being disposed in the vicinity of a plane on which the images of the imaginary light-source points are formed, the diaphragm selectively blocks luminous flux emitted from each of the images of the imaginary light-source points;

a light valve means being disposed in the vicinity of a plane on which the second lens unit form an image of the emitting end, the light valve means having a plurality of mirrors forming mirror array each of which reflects light in a first direction or in a second direction, the light valve means which forms images with the light reflected in the first direction; and

,

a projection means for projecting the images formed by the light valve means onto a screen, wherein the diaphragm blocks scattered light or diffracted light to enter into the projection means, which is contained in light reflected in the second direction by the light valve means.

9. A light-source device comprising:

a first lens unit for condensing light emitted by a lamp;

a rod integrator having an injection end and an emitting end, the injection end being disposed with no other intervening optical elements in relation to a convergence point of the light condensed by the first lens unit, the rod integrator forming a plurality of imaginary light-source points each of which virtually emits the luminous flux to the emitting end

a second lens unit for forming the images of the imaginary light source points and

a diaphragm being disposed with no other intervening optical elements in relation to a plane on which the images of the imaginary light-source points are formed, the diaphragm selectively blocks luminous flux emitted from each of the images of the imaginary light-source points.