Method and apparatus for generating a control signal
First Claim
1. An apparatus for capturing an image, complipsing a substantially spherical glass lens for transmitting electromagnetic radiation corresponding to the image, and a detector for receiving the electromagnetic radiation and generating charge corresponding to the image in response thereto, wherein the lens is coupled to the detector using a material having a first index of refraction which is substantially the same as a second index of refraction associated with the lens.
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Abstract
A method and apparatus for generating a control signal which corresponds to movement of an object in contact with a first surface are described. The apparatus includes a platen having the first surface. The platen is characterized by a critical angle beyond which light incident upon the first surface is not transmitted. A source of electromagnetic radiation emits electromagnetic radiation through the platen thereby illuminating the object. A detector having a plurality of sectors receives a portion of the electromagnetic radiation diffused by the object and transmitted through the platen beyond the critical angle. The sectors of the detector accumulate charge in response to the incident electromagnetic radiation. Conversion circuitry then converts the charge accumulated in the detector to the control signal, which in a specific embodiment is for controlling the movement of a pointer on a display.
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Citations
14 Claims
- 1. An apparatus for capturing an image, complipsing a substantially spherical glass lens for transmitting electromagnetic radiation corresponding to the image, and a detector for receiving the electromagnetic radiation and generating charge corresponding to the image in response thereto, wherein the lens is coupled to the detector using a material having a first index of refraction which is substantially the same as a second index of refraction associated with the lens.
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14. An optical system for generating a magnified image of an object, comprising a substantially spherical glass lens for transmitting electromagnetic radiation corresponding to the image, and a detector for receiving the electromagnetic radiation and generating charge corresponding to the image in response thereto, wherein the lens is coupled to the detector using a material having a first index of refraction which is substantially the same as a second index of refraction associated with the lens.
Specification