Optical navigation system and method of estimating motion with optical lift detection
First Claim
Patent Images
1. An optical navigation system comprising:
- a light source configured to generate light;
an image sensor positioned to receive a first portion of said light reflected from a target surface, said image sensor being configured to generate frames of image data in response to said received first portion of said light for motion estimation; and
a lift detection unit comprising;
a plate with an aperture;
a photodetector positioned over said plate; and
an optical system positioned over said plate to receive a second portion of said light from said light source, said optical system being configured to direct said second portion of said light through said aperture of said plate, said optical system being further configured to direct said second portion of said light reflected from said target surface and transmitted back through said aperture of said plate toward said photodetector to be detected by said photodetector for lift detection.
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Abstract
An optical navigation system and method of estimating motion uses a plate with an aperture, a photodetector and an optical system for optical lift detection. The optical system is configured to direct an input light to a target surface through the aperture of the plate and to direct the input light reflected from the target surface and transmitted back through the aperture of the plate toward the photodetector to be detected by the photodetector for lift detection.
38 Citations
20 Claims
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1. An optical navigation system comprising:
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a light source configured to generate light; an image sensor positioned to receive a first portion of said light reflected from a target surface, said image sensor being configured to generate frames of image data in response to said received first portion of said light for motion estimation; and a lift detection unit comprising; a plate with an aperture; a photodetector positioned over said plate; and an optical system positioned over said plate to receive a second portion of said light from said light source, said optical system being configured to direct said second portion of said light through said aperture of said plate, said optical system being further configured to direct said second portion of said light reflected from said target surface and transmitted back through said aperture of said plate toward said photodetector to be detected by said photodetector for lift detection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An optical navigation system comprising:
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a plate with an aperture; a photodetector positioned over said plate; and an optical system positioned over said plate, said optical system comprising; a first prism positioned to receive an input light, said first prism being configured and orientated to refract said input light through said aperture of said plate; a second prism positioned to receive said input light reflected from a target surface and transmitted back through said aperture of said plate, said second prism being configured and orientated to refract said input light to a predefined direction; and a third prism positioned to receive said input light from said second prism, said third prism being configured to refract said input light toward said photodetector to be detected by said photodetector for lift detection. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of estimating motion comprising:
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generating light; directing a first portion of said light toward a target surface; receiving said first portion of said light reflected from said target surface at an image sensor for motion estimation; directing a second portion of said light toward said target surface through an aperture positioned over said target surface; directing said second portion of said light reflected from said target surface and transmitted back through said aperture toward a photodetector; and receiving said second portion of said light at said photodetector for lift detection. - View Dependent Claims (18, 19, 20)
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Specification