Optical navigation device adapted for navigation on a transparent plate
View Patent ↗An optical navigation device, such an optical mouse, includes a housing, an illumination system, a tracking engine, and multiple height-specific imaging systems located within the housing. The height-specific imaging systems generate image information in response to reflected light from a navigation surface and each one the height-specific imaging systems is positioned to detect the largest portion of reflected light at a different separation distance between the housing and the navigation surface. An integrated circuit (IC) device for optical navigation includes an aperture plate having height-specific apertures and height-specific navigation sensor arrays aligned in one-to-one correspondence with the height-specific apertures and configured to generate image information in response to light that passes through the corresponding height-specific apertures. An optical element for use in an optical navigation system includes an illumination source lens and multiple height-specific focal lenses.
1. An optical navigation device comprising:
a housing;
an illumination system located within the housing and configured to illuminate a navigation surface;
a plurality of height-specific imaging systems located within the housing, wherein the height-specific imaging systems are configured to generate image information in response to reflected light from the illumination of the navigation surface and wherein each one of the height-specific imaging systems is positioned to detect the largest portion of the reflected light at a different separation distance between the housing and the navigation surface; and
a tracking engine configured to generate relative movement information, related to movement between the housing and the navigation surface, in response to the image information;
wherein the tracking engine is configured to select image information from one of the height-specific imaging systems in response to a comparison of the image information from the plurality of height-specific imaging systems and to use the selected image information to generate the relative movement information;
wherein the plurality of height-specific imaging systems comprises:
a first height-specific focal lens configured to focus light that reflects off the navigation surface, wherein the first height-specific focal lens is positioned to receive the largest portion of reflected light at a first separation distance between the optical navigation device and the navigation surface, wherein the first separation distance is the distance when the optical navigation device sits directly on the navigation surface; and
a plurality of additional height-specific focal lenses configured to focus light that reflects off the navigation surface, wherein the plurality of additional height-specific focal lenses are positioned to receive the largest portion of reflected light at a plurality of different separation distances between the optical navigation device and the navigation surface, wherein the plurality of different separation distances are greater than the first separation distance and different from each other.
2. The optical navigation device of claim 1 wherein each height-specific imaging system comprises configured to generate image information related to the illuminated navigation surface.
3. The optical navigation device of claim 2 further comprising an aperture plate having height-specific apertures that correspond to the height-specific focal lenses and the height-specific sensor arrays.
4. The optical navigation device of claim 2 wherein each height-specific imaging system comprises a height-specific aperture.
5. The optical navigation device of claim 2 wherein the height-specific lenses are integrated into a single optical element.
6. The optical navigation device of claim 2 wherein each height-specific sensor array outputs a SQUAL value that is representative of light that is detected by the respective height-specific navigation sensor array.
7. The optical navigation device of claim 6 wherein the tracking engine is configured to select image information from one of the height-specific imaging systems in response to the SQUAL values and to use the selected image information to generate the relative movement information.
8. The optical navigation device of claim 1 wherein the navigation surface is located below a transparent plate.
9. An optical navigation device comprising:
an illumination system configured to illuminate a navigation surface;
a first height-specific focal lens configured to focus light that reflects off the navigation surface, wherein the first height-specific focal lens is positioned to receive the largest portion of reflected light at a first separation distance between the optical navigation device and the navigation surface, wherein the first separation distance is the distance when the optical navigation device sits directly on the navigation surface; and
a plurality of additional height-specific focal lenses configured to focus light that reflects off the navigation surface, wherein the plurality of additional height-specific focal lenses are positioned to receive the largest portion of reflected light at a plurality of different separation distances between the optical navigation device and the navigation surface, wherein the plurality of different separation distances are greater than the first separation distance and different from each other;
a sensor array comprising multiple sub-arrays, wherein each sub-array is configured to generate image information related to the illuminated navigation surface; and
a tracking engine configured to select image information from one of the sub-arrays and to generate relative movement information, related to movement between the navigation sensor array and the navigation surface, in response to the selected image information;
wherein the tracking engine is configured to select image information from one of the sub-arrays in response to a comparison of the image information generated from the sub-arrays.
10. The optical navigation device of claim 9 further comprising height-specific focal lenses positioned to correspond to the sub-arrays.
11. The optical navigation device of claim 10 wherein the height-specific lenses are integrated into a single optical element.
12. The optical navigation device of claim 9 further comprising an aperture plate having height-specific apertures that correspond to the sub-arrays.
13. The optical navigation device of claim 9 wherein each sub-array outputs a SQUAL value that is representative of light that is detected by the respective height-specific sensor arrays.
14. The optical navigation device of claim 13 wherein the tracking engine is configured to select image information from one of the height-specific imaging systems in response to the SQUAL values and to use the selected image information to generate the relative movement information.
15. An optical element for use in an optical navigation system that includes an illumination source and that is configured to detect relative movement between the optical navigation system and a navigation surface, the optical element comprising:
an illumination source lens configured to focus light, which is output from the illumination source, onto the navigation surface;
a first height-specific focal lens configured to focus light that reflects off the navigation surface, wherein the first height-specific focal lens is positioned to receive the largest portion of reflected light at a first separation distance between the optical navigation system and the navigation surface, wherein the first separation distance is the distance when the optical navigation system sits directly on the navigation surface; and
a plurality of additional height-specific focal lenses configured to focus light that reflects off the navigation surface, wherein the plurality of additional height-specific focal lenses are positioned to receive the largest portion of reflected light at a plurality of different separation distances between the optical navigation system and the navigation surface, wherein the plurality of different separation distances are greater than the first separation distance and different from each other.
16. The optical element of claim 15 wherein the first and plurality of additional height-specific lenses are linearly aligned.
17. The optical element of claim 15 wherein the illumination source lens and the first and plurality of additional height-specific lenses are linearly aligned.