1. A touch-sensitive device, comprising:
a display;
a laser;
a scanning mirror configured to direct light from the laser through the display and to scan the light from the laser across the display;
a position-sensitive device;
optics configured to form an image of at least a portion of the display on the position-sensitive device; and
a processor and memory containing instructions executable by the processor to determine a location of an object relative to the display by detecting via output from the position-sensitive device a location on the position-sensitive device of laser light reflected by the object back through the display.
2. The device of claim 1, wherein the instructions are executable to determine a location at which the object is touching the display.
3. The device of claim 1, wherein the instructions are executable to determine whether the object is spaced from the display.
4. The device of claim 1, wherein the instructions are executable to compare the location on the position-sensitive device of the image of laser light reflected with an expected location of the image of laser light from the laser based upon a position of the scanning mirror.
5. The device of claim 1, further comprising a liquid crystal display panel disposed adjacent to the display for presenting an image to a user.
6. The device of claim 1, wherein the position-sensitive device is a one-dimensional position-sensitive device.
7. The device of claim 1, wherein the position-sensitive device is a two-dimensional position-sensitive device.
8. The device of claim 1, further comprising one or more photodetectors and instructions executable to record an image of the display via the one or more photodetectors.
9. The device of claim 1, further comprising a plurality of lasers and a plurality of position-sensitive devices configured to scan a plurality of portions of the display in parallel.
10. The device of claim 1, wherein the optics comprises one or more of a circular lens and a cylindrical lens.
11. The device of claim 1, further comprising an internal reflection device to transmit light from the laser to the display and to transmit reflected light from the object through the display to the position-sensitive device.
12. In an optical touch-sensitive device comprising a display, a laser, a scanning mirror configured to scan light from the laser across the display, a position-sensitive device, and optics configured to form an image of the display on the position-sensitive device, a method of determining whether an object is touching the display or spaced from the display, the method comprising:
directing the light from the laser through the display with the scanning mirror;
scanning the light from the laser across the display with the scanning mirror;
detecting a location on the position-sensitive device of an image of laser light reflected from an object and back through the display; and
determining a location of the object relative to the display by comparing the location on the position-sensitive device of the image of laser light reflected from the object with an expected location of the image of light from the laser based upon a position of the scanning minor.
13. The method of claim 12, further comprising synchronizing the position-sensitive device and the scanning mirror by detecting on the position-sensitive device light reflected from one or more preselected calibration locations.
14. The method of claim 12, further comprising synchronizing the position-sensitive device and the scanning minor by comparing a signal from the scanning mirror with a signal from the position-sensitive device.
15. The method of claim 12, further comprising determining a location of the object on the display.
16. The method of claim 12, further comprising determining whether the object is spaced from the display.
17. A method of operating an optical touch-sensitive device with an optical touch-sensitive display, the method comprising:
displaying an image viewable at the display;
directing a laser through the display;
scanning the laser across the display in two dimensions via a scanning mirror system;
acquiring an image of the display via one or more photodetectors;
forming an image of the display on a position-sensitive device;
determining whether an object is touching the display or located over the display by comparing a location of laser light reflected back through the display in the image of the display with an expected location of reflected laser light based upon a position of the scanning mirror system; and
modifying the image displayed on the display based upon whether the object is touching the display or spaced from the display.
18. The method of claim 17, further comprising determining a location of the object on the display.
19. The method of claim 17, further comprising modifying the image if the object is spaced from the display.
20. The method of claim 17, further comprising modifying the image only if the object is touching the display.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A seismic shotgun device, comprising:
a longitudinal support frame;
a platform mounted to said support frame, said platform having an upper surface, a lower surface, and an aperture;
a wheel assembly comprising at least one wheel mounted to said support frame;
a base plate proximate said wheel assembly, wherein said base plate is substantially perpendicular to said support frame;
an elongate stock detachably mounted to, and roughly perpendicular to, said platform, wherein said stock has a first and a second end;
wherein said aperture is adapted to receive said second end of said stock;
a firing mechanism at said first end of said stock;
a barrel detachably secured to said second end of said stock, said barrel adapted to receive ammunition;
a firing pin disposed between and in communication with said firing mechanism and said barrel;
and a skirt mounted to said lower surface of said platform, proximate said aperture.
2. The device of claim 1 wherein said base plate is opposite said wheel assembly.
3. The device of claim 2 wherein said support frame, wheel assembly and base plate comprise a preassembled, conventional hand truck.
4. The device of claim 1 wherein said aperture is roughly centrally located about said platform.
5. The device of claim 1 wherein said firing pin is disposed centrally within said stock.
6. The device of claim 1 wherein said firing mechanism further comprises a safety.
7. The device of claim 1 wherein said upper surface of said platform further comprises a non-skid material proximate said aperture.
8. The device of claim 1 wherein said wheel assembly comprises an axle and a tire and wheel at each end of said axle.
9. The device of claim 1, further comprising means for releasably mounting said stock to said lower surface of said platform.
10. The device of claim 1 comprising a plurality of barrels each adapted to receive a different type of ammunition.
11. The device of claim 1 wherein said skirt completely encircles the space beneath said aperture.
12. A seismic shotgun device, comprising:
a conventional hand truck, said hand truck comprising a longitudinal support frame, a wheel assembly, and a base plate opposite said wheel assembly and roughly perpendicular to said support frame;
a platform having an upper surface, a lower surface and an aperture, wherein said lower surface of said platform is mounted to said support frame;
an elongate stock having a first end and a second end, said stock detachably and roughly perpendicularly mounted to said platform, wherein said stock is disposed within said aperture;
a firing mechanism at said first end of said stock;
a barrel detachably secured to said second end of said stock, said barrel adapted to receive ammunition;
a firing pin disposed between said firing mechanism and said barrel;
wherein said platform and said base plate are adapted to transport cargo when said device is not in use; and
means for releasably mounting said stock to said lower surface of said platform.
13. A method for constructing a seismic shotgun device, comprising the steps of:
providing a preassembled, conventional hand truck having a longitudinal support frame, a wheel assembly, and a base plate that is substantially perpendicular to said support frame;
mounting a platform to said support frame, said platform having an upper surface, a lower surface, and an aperture;
detachably mounting an elongate stock to, and roughly perpendicular to, said platform, wherein said stock has a first and a second end;
adapting said aperture to receive said second end of said stock;
providing a firing mechanism at said first end of said stock;
detachably securing a barrel to said second end of said stock, said barrel adapted to receive ammunition;
disposing a firing pin between and in communication with said firing mechanism and said barrel;
and mounting a skirt to said lower surface of said platform, proximate said aperture.