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US 8,801,189 B2Granted
Laser projector
AssigneePanasonic Corporation
InventorsTetsuro Mizushima, Tatsuo Itoh, Kenichi Kasazumi, Kenji Nakayama
Life of this patent
Estimating the term…
Abstract
There is provided a laser projector, including: a laser source section for emitting laser beams; a spatial light modulator which modulates the laser beams to generate image light; a projector lens from which the image light is emitted; a beam shaper which shapes the laser beams into a shape of the spatial light modulator; and a pupil uniformizer which makes a light intensity distribution uniform at an exit pupil of the projector lens, wherein the pupil uniformizer is situated between the laser source section and the beam shaper.
Claims12
A laser projector, comprising:
- a laser source section configured to emit laser beams;
- a spatial light modulator which modulates the laser beams to generate image light;
- a projector lens from which the image light is emitted;
- a beam shaper configured to shape the laser beam into a shape of the spatial light modulator, the beam shaper being in a conjugated relationship with an exit pupil of the projector lens;
- and
- a pupil uniformizer which makes a light intensity distribution uniform at the exit pupil of the projector lens, wherein
- the pupil uniformizer is situated between the laser source section and the beam shaper and makes an intensity distribution of incident light to the beam shaper uniform.
4 more elements
A laser projector, comprising:
- a laser source section configured to emit laser beams;
- a spatial light modulator which modulates the laser beams to generate image light;
- a projector lens from which the image light is emitted;
- a beam shaper configured to shape the laser beam into a shape of the spatial light modulator;
- and
- a pupil uniformizer which makes a light intensity distribution uniform at an exit pupil of the projector lens,
- wherein the pupil uniformizer is situated between the laser source section and the beam shaper,
- wherein the pupil uniformizer includes a cluster of first element lenses which make the light intensity distribution uniform,
- wherein the beam shaper includes a cluster of second element lenses which shape the laser beams into the shape of the spatial light modulator,
- wherein the first element lenses spread the laser beams in response to a divergent angle of the first element lenses to make the light intensity distribution uniform, and
- wherein the second element lenses spread the laser beams in response to a divergent angle of the second element lenses to shape the laser beam.
8 more elements
A laser projector, comprising:
- a laser source section configured to emit laser beams;
- a spatial light modulator which modulates the laser beams to generate image light;
- a projector lens from which the image light is emitted;
- a beam shaper configured to shape the laser beam into a shape of the spatial light modulator;
- and
- a pupil uniformizer which makes a light intensity distribution uniform at an exit pupil of the projector lens,
- wherein the pupil uniformizer is situated between the laser source section and the beam shaper,
- wherein the laser source section includes a red laser source, which emits a red laser beam, a green light source, which emits a green laser beam, and a blue laser source, which emits a blue laser beam, and
- wherein a sectional area of the red laser beam incident to the beam shaper is smaller than sectional areas of the green and blue laser beams incident to the beam shaper.
6 more elements
A laser projector, comprising:
- a laser source section configured to emit laser beams;
- a spatial light modulator which modulates the laser beams to generate image light;
- a projector lens from which the image light is emitted;
- a beam shaper configured to shape the laser beam into a shape of the spatial light modulator;
- and
- a pupil uniformizer which makes a light intensity distribution uniform at an exit pupil of the projector lens,
- wherein the pupil uniformizer is situated between the laser source section and the beam shaper, and
- wherein a relationship of F#<f/D<2×F# is satisfied where F# is an f-number of the projector lens, D is a longitudinal beam diameter of the laser beams incident to the beam shaper, and f is a focal distance of a lens group through which the laser beams incident to the beam shaper pass up to the spatial light modulator.
5 more elements
Dependencies are inferred from the claim text.