Optical Position Sensor Architecture for Servo Systems
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Abstract
System and method for an optical position sensor architecture for use in servo systems. A preferred embodiment comprises a light source configured to produce a light with an intensity dependent upon a control signal, a first light sensor and a second light sensor positioned adjacent to one another, each light sensor configured to produce a current based upon an amount of light incident upon each light sensor. The preferred embodiment also comprises a slotted device coupled to the load and positioned between the light source and the first light sensor and the second light sensor. The slotted device regulates an amount of light striking the first light sensor and the second light sensor based upon a position of the load. The slotted device features a slot that has a radius with a linearly increasing radius as a function of rotation angle so that the optical position sensor has linear behavior.
6 Citations
23 Claims
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1-10. -10. (canceled)
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11. A method for generating a feedback control signal for an optical servo system, the method comprising:
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computing the feedback control signal from a difference of a first current produced by a first optical sensor and a second current produced by a second optical sensor; and computing a light modulation signal for a light source illuminating the first optical sensor and the second optical sensor, wherein the modulation of the light source results in an automatic normalization of the feedback control signal. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A display system for displaying images, the display system comprising:
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an array of light modulators configured to create images comprised of pixels by setting each light modulator in the array of light modulators into a state matching a corresponding pixel; a light source to illuminate the array of light modulators, wherein a light from the light source reflecting off the array of light modulators forms the images on a display; an aperture positioned in between the light source and the array of light modulators, the aperture configured to modulate the light produced by the light source; and a servo system coupled to the aperture, the servo system configured to move the aperture into position to modulate the light by a desired amount. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification