The system also includes a cladding layer directly coupled to the first side of the compliant optical waveguide.The cladding layer has an index of refraction sufficiently lower than the index of refraction of the compliant optical waveguide so that deformation of the cladding layer causes some of the light undergoing total internal reflection to scatter and to escape the compliant optical waveguide. It is therefore an object of the present invention to provide multi-touch sensing systems/processes that are relatively simple, inexpensive and scalable for providing high-resolution multi-touch sensing.Tags: www fdating com englandRandom video datingwho is dating lil kimonline dating services pollock idahobest online friend dating u a eAunty sex numberLive sex chat with nigerian girls100 25 dating com
One fairly straightforward approach for sensing multiple points of contact simultaneously or “multi-touch sensing” employing non-FTIR based methods is to utilize multiple sensors, with each sensor sensing a respective point of contact. has a line of array sensors for use as floor sensors, security devices and other applications. 4,134,063 to Nicol et al., incorporated herein by reference, discloses the use of capacitive electrodes for this purpose. 6,323,846 to Westerman et al., incorporated herein by reference, discloses additional examples of using such an array in a multi-touch surface system.
4,484,179 to Kasday, incorporated herein by reference, discloses this approach in the context of a touch sensitive display.
The systems and processes described provide true multi-touch (multi-input) and high-spatial and temporal resolution capability due to the continuous imaging of the frustrated total internal reflection that escapes the entire optical waveguide. The system also includes a cladding layer directly coupled to the compliant layer.
Among other features and benefits, the systems and processes are scalable to large installations. The cladding layer has an index of refraction sufficiently lower than the index of refraction of the compliant layer so that deformation of the cladding layer causes some of the light undergoing total internal reflection to scatter and to escape the compliant layer and the optical waveguide.
An image sensor detects some of the light that escapes the compliant optical waveguide.
For each of these embodiments, the present invention includes a number of aspects, features and variations.As a further aspect of the present invention, the compliant layer is deformable by depressing a second surface of the compliant layer by a finger of the user of the multi-touch sensing system.As another aspect of the present invention, the image sensor is optically disposed to receive the light that escapes from the second side of the optical waveguide. However, another material at the interface can frustrate this total internal reflection, causing light to escape the waveguide there instead. Y., 289-296 (2004); and tracking markers embedded within a deformable substrate as disclosed in Kamiyama, K., Vlack, K., Mizota, T., Kajimoto, H., Kawakami, N., and Tachi, S., “Vision-Based Sensor for Real-Time Measuring of Surface Traction Fields,” IEEE Comput. In view of the foregoing, it is seen that there has been only limited development in the field of multi-touch sensing. Fiber optics, light pipes, and other optical waveguides rely on this phenomenon to transport light efficiently with very little loss. 13-15, 2004), ICMI '04, ACM Press, New York, N. Additional publications that set forth various interaction techniques include: Buxton, W., Hill, R., and Rowley, P., “Issues and Techniques in Touch-Sensitive Tablet Input,” Proceedings of the 12th Annual Conference on Computer Graphics and Interactive Techniques SIGGRAPH '85, ACM Press, New York, N. and Leigh, D., “Diamond Touch: A Multi-User Touch Technology,” Proceedings of the 14th Annual ACM Symposium on User Interface Software and Technology (Orlando, Fla., Nov. and Balakrishnan, R., “Multi-Finger and Whole Hand Gestural Interaction Techniques for Multi-User Tabletop Displays,” Proceedings of the 16th Annual ACM Symposium on User Interface Software and Technology (Vancouver, Canada, Nov. Y., 193-202 (2003), each of which is incorporated herein by reference. In accordance with the present invention, a multi-touch sensing system comprises an optical waveguide having an index of refraction sufficient to cause light of at least one wavelength (e.g., narrow band wavelength) received in a predetermined direction to undergo total internal reflection within the optical waveguide. It is a further object of the present invention to provide multi-touch sensing systems/processes that are based on frustrated total internal reflection.As a further aspect of the present invention, the optical waveguide may be a compound component.As a particular feature of this aspect, the optical waveguide is comprised of a non-compliant optical waveguide treated with a compliant layer.As a feature of this aspect, a band pass filter optically disposed between the second side of the optical waveguide and the image sensor allows substantially only the light at said wavelength to pass from the optical waveguide to the image sensor.As a further aspect of the present invention, the image sensor is a flat image sensor such as a TFT (thin-film transistor) image sensor.