ILLUMINATION SYSTEM TO ELIMINATE LASER SPECKLE AND PROJECTION SYSTEM EMPLOYING THE SAME
First Claim
1. An illumination system to remove speckle of a laser beam, the illumination system comprising:
- a laser light source having at least one laser to emit a laser beam;
an optical fiber bundle including a plurality of fibers with the same length to divide the laser beam emitted from the laser light source into a plurality of sub-beams; and
a vibrator to vibrate to temporally average the plurality of sub-beams such that an image is formed according to the sub-beams.
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Accused Products
Abstract
An illumination system designed to remove laser speckle and a projection system including the same. The illumination system includes a laser light source having at least one laser, a diffractive optical element to divide a laser beam emitted from the laser light source into a plurality of sub-beams and to periodically move in such a way as to temporally average the speckle of the laser beam, and an optical fiber bundle including a plurality of fibers with the same length to divide the sub-beams into smaller sub-beams. The illumination system divides the laser beam emitted from the laser light source into sub-beams and temporally or spatially averages the sub-beams, thereby effectively reducing or removing laser speckle. The projection system employing the illumination system can provide improved image quality.
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Citations
16 Claims
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1. An illumination system to remove speckle of a laser beam, the illumination system comprising:
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a laser light source having at least one laser to emit a laser beam; an optical fiber bundle including a plurality of fibers with the same length to divide the laser beam emitted from the laser light source into a plurality of sub-beams; and a vibrator to vibrate to temporally average the plurality of sub-beams such that an image is formed according to the sub-beams. - View Dependent Claims (2, 3, 4, 5, 6)
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7. The illumination system, comprising:
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a laser light source unit to emit a laser beam; a movable temporal averaging unit to temporally average the laser beam emitted from the laser light source unit; and an optical fiber bundle having a plurality of optical fibers each having the same length to divide the averaged laser beam emitted from the laser light source unit into a plurality of sub-beams so that an image is formed according to the sub-beams, wherein the optical fiber bundle is disposed between the laser light source unit and the movable temporal averaging unit, and the movable temporal averaging unit comprises; a reflective mirror to reflect the plurality of sub-beams output from the optical fiber bundle; and one or more piezoelectric elements to vibrate the reflective mirror to temporally average the plurality of sub-beams.
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8. A projection system to remove speckle of a laser beam, the projection system comprising:
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a laser light source having at least one laser to emit a laser beam; an optical fiber bundle including a plurality of fibers with the same length to divide the laser beam emitted from the laser light source into a plurality of sub-beams; a beam-shaping unit to shape the plurality of sub-beams output by the optical fiber bundle; a vibrator to vibrate to temporally average the plurality of sub-beams; a display device to produce an image using the plurality of sub-beams temporally averaged by the vibrator; a screen; and a projection lens unit to enlarge and project the image produced by the display device onto the screen. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An image projection system, comprising:
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a laser light source to emit a laser beam; a first averaging unit to average the laser beam; an optical bundle to divide the laser beam averaged by the first averaging unit into sub-beams; a second averaging unit to average the sub-beams; and a display device to form and display an image using the sub-beams.
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16. An image projection system, comprising:
- a laser light source to emit a laser beam;
an optical fiber bundle having a plurality of optical fibers to divide the laser beam into first sub-beams; a collimating lens to collimate the first sub-beams; a first fly-lens array to divide the collimated first sub-beams into second sub-beams; a second fly-lens array to focus the second sub-beams to overlap with each other and to provide a beam of a predetermined shape; an averaging unit to temporally average the beam of the predetermined shape; and a display device to form and display an image using the temporally averaged beam of the predetermined shape.
- a laser light source to emit a laser beam;
Specification