Focusing arrangement
AssigneeHewlett-Packard Development Company, L.P.
InventorsP Guy Howard, Anurag Gupta
Life of this patent
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Abstract
A focusing arrangement has a lens disposed adjacent a lamp, a sensor for detecting a parameter which varies with a focal position of light focused by the lens, and a controller for adjusting the position of the lens based upon an output from the sensor in a manner which modifies the focal position of the light by the lens and maximizes the parameter detected by the sensor.
Claims20
A method of focusing light in a device having a light source and a lens associated with the light source for focusing the light from the light source onto a light transmitting element, comprising:
- sensing a parameter which varies with the light focused onto the light transmitting element, wherein the step of sensing comprises arranging a plurality of sensing elements in a predetermined spatial arrangement with respect to one another and an entrance of the light transmitting element;
- determining relative spatial adjustment of the one of the light source and the lens with respect to the other necessary to maximize the sensed parameter;
- and
- implementing the relative spatial adjustment.
A focusing arrangement comprising:
- a light transmitting element;
- a source of light;
- a condensing lens disposed between the source of light and the light transmitting element so as to focus the light on the light transmitting element;
- a sensor responsive to a parameter which varies with the focus of light on the light transmitting element;
- and
- a drive arrangement operatively connected with the condensing lens to adjust the position of the lens relative to the light transmitting element in response to an output of the sensor;
- wherein the sensor is disposed at an entrance of the light transmitting element, and wherein the sensor comprises a plurality of detectors arranged in a predetermined spatial arrangement with respect to one another and the entrance of the light transmitting element.
A focusing arrangement, comprising;
- a lens disposed adjacent a lamp;
- a sensor for detecting a parameter which varies with a focal position of light focused by the lens;
- a controller for adjusting a position of the lens based upon an output from the sensor in a manner which modifies the focal position of the light by the lens and maximizes the parameter detected by the sensor;
- and
- a light transmitting element onto which the light focused by the lens, is focused, and which is operatively interposed between the lens and a screen which lies at an end of a projection patch along which light emitted by the light transmitting element, is directed;
- wherein the light transmitting element comprises a light integrating device;
- wherein the sensor is disposed at an entrance of the light integrating device;
- wherein the sensor comprises a plurality detectors which are arranged in a predetermined spatial arrangement with respect to each other and the entrance of the light integrating device.
A focusing arrangement having a light source and a lens associated with the light source for focusing light from the light source onto a light transmitting element, comprising:
- means for sensing a parameter which varies with the focus of the light on the light transmitting element by the lens;
- means for comparing the sensed parameter with a predetermined value and calculating, in the event that the sensed parameter is less than the predetermined value, the relative spatial adjustment between the lens and the light transmitting element which will increase the sensed parameter toward the predetermined value;
- and
- means for implementing the calculated relative spatial adjustment;
- wherein the parameter sensing means comprises a sensor which comprises a plurality of detectors which are arranged in a predetermined spatial arrangement with respect to each other and the light transmitting element.
Dependencies are inferred from the claim text.