Microsoft Technology Licensing, LLC

Tim Large

Karlton David Powell

Kurt Jenkins

Neil Emerton

Lincoln Matthew Ghioni

Yutaka Tokuda

The description relates to laminated input devices, such as keyboards. One example can include a laminated light-distribution assembly and a key assembly adhered in light receiving relation to the laminated light-distribution assembly as a laminated input device having a neutral axis in the light-distribution assembly.

Laminated input devices

Polarization state in retro-reflective arrays may be controlled throughout the optical path of a retro-reflective retro-imaging setup to enhance system efficiency. A polarization beam splitter layer and a retarder layer placed in front of the retro-reflector array may be oriented such that polarized light is used as source, source input light is efficiently reflected at the polarization beam splitter layer toward the retro-reflective layer, and polarization is converted to circular upon first pass through retarder layer. The polarization may also be oriented at or near 45&#xb0; with respect to input polarization state, light may be retro-reflected and reconverged at the retro-reflective layer, and converted to linear polarization state. The light may then be rotated about 90&#xb0; with respect to input linear state, and/or passed through the polarization beam splitter layer upon second pass to form the reconvergent image.

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Bellevue, WA, United States of America

Tim Large