Optical modules that reduce speckle contrast and diffraction artifacts
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United States of America Patent
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Aug 4, 2016
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Sep 23, 2013
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Abstract
An optical module, for use in a depth camera, includes a plurality of laser emitting elements, each of which emits a corresponding laser beam, and a micro-lens array (MLA) that includes a plurality of lenslets. Laser beams emitted by adjacent laser emitting elements at least partially overlap one another prior to being incident on the MLA For each lenslet of at least a majority of the lenslets of the MLA, the lenslet is at least partially filled by light corresponding to laser beams emitted by at least two of the laser emitting elements. The inclusion of the plurality of laser emitting elements is used to reduce speckle contrast. The overlap of the laser beams, and the at least partially filling of the lenslets of the MLA with light corresponding to laser beams emitted by multiple laser emitting elements, is used to reduce diffraction artifacts.
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