Method and apparatus for adjusting relative disposition of projection optics based on operating conditions
View Patent ↗A system, method, and apparatus for sensing an operational condition of a projection device and generating a signal to be used in the adjustment of the relative disposition of a component of the projection device, are disclosed herein.
1. An apparatus comprising:
a light valve adapted to output a first image;
a calibration object, positioned adjacent to the light valve, to output a second image;
projection optics optically coupled to the light valve to project the first image and optically coupled to the calibration object to project the second image, the projection optics having a first lens element relatively disposed away from the light valve;
a temperature sensor, adapted to sense a temperture of the apparatus, and to generate a first sensor signal based at least in part upon the sensed temperture; and
a controller adapted to determine a change in focal distance of the projection optics based at least in part upon the sensed temperture, and to generate a control signal based at least in part upon the change in the focal distance for use to adjust the ralative disposition of the first lens element and the light valve.
2. The apparatus of claim 1 , comprising:
a mechanical actuator coupled to at least a selected one of the first lens element or the light valve, to move the selected one(s) to adjust the relative disposition of the first lens element and the light valve, based at least in part on the sensor signal and/or the control signal.
3. The apparatus of claim 1 , further comprising:
an image capture device adapted to receive the second image, and to generate a second sensor signal based at least in part upon the second image.
4. The apparatus of claim 3 , wherein the second image has an expected focal status and the controller is further adapted to determine a current focal status for the second image based at least in part upon the second sensor signal, and to generate the control signal based at least in part upon a selected one of the current focal status or a difference between the current and expected focal statuses.
5. The apparatus of claim 4 , wherein the first image has an expected focal status that is correlated to the second image's expected focal status.
6. The apparatus of claim 1 , wherein the projection optics output the first image in a first direction and the second image in a second direction that is different than the first direction.
7. The apparatus of claim 1 , wherein the apparatus further comprises:
a dichroic reflector optically coupled to the projection optics and adapted to transmit the first image and to reflect the second image.
8. The apparatus of claim 7 , wherein the second image comprises infrared light.
9. An apparatus comprising:
a light valve adapted to output a first image;
a calibration object, positioned adjacent to the light valve, to output a second image having a current focal status and an expected focal status;
projection optics optically coupled to the light valve and the calibration object to project the first image and the second image, the projection optics having a first lens element relatively disposed away from the light valve;
a sensor adapted to receive the second image, and to generate a sensor signal based at least in part upon the second image; and
a controller adapted to determine the current focal status for the second image based at least in part upon the sensor signal, and to generate a control signal based at least in part upon a selected one of the current focal status or a difference between the current and expected focal statuses, for use to adjust the relative disposition of the first lens element and the light valve.
10. The apparatus of claim 9 , further comprising:
a projection device including the light valve, calibration object, projection optics, control and sensor; and
an input device coupled to the projection device, to provide an input signal to the projection device, the first image based at least in part upon the input signal.
11. The apparatus of claim 9 , wherein the sensor comprises an image capture device.
12. The apparatus of claim 11 , wherein the image capture device comprises a charge-coupled device.
13. The apparatus of claim 9 , further comprising:
a mechanical actuator coupled to at least a selected one of the first lens element or the light valve, to move the selected one(s) to adjust the relative disposition of the first lens element and the light valve, based at least in part on the sensor signal and/or the control signal.
14. The apparatus of claim 9 , wherein the first image has an expected focal status that is correlated to the second image's expected focal status.
15. The apparatus of claim 9 , wherein the calibration object comprises a linear pattern.
16. The apparatus of claim 9 , wherein the projection optics output the first image in a first direction and the second image in a second direction that is different than the first direction.
17. The apparatus of claim 9 , wherein the apparatus further corn prises:
a dichroic reflector optically coupled to the projection optics and adapted to transmit the first image and to reflect the second image.
18. The apparatus of claim 17 , wherein the second image comprises infrared light.
19. The apparatus of claim 9 , wherein the light valve and the calibration object are positioned in a common plane.