Passive touch-sensitive optical marker
AssigneeInternational Business Machines Corporation
InventorsFerdinand Hendriks, John P. Karidis
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Abstract
A passive optical marker for use in accordance with an electronic whiteboard system that selectively allows a reflector associated with the optical marker to be exposed to a light emitting source. Thus, the optical marker of the present invention selectively provides information pertaining to the location of the optical marker and pen-up/pen-down states.
Claims28
An optical marker for use in accordance with an electronic whiteboard system, the electronic whiteboard system including a light emitting source, the optical marker comprising:
- a reflector for reflecting at least a portion of light emitted from the light emitting source when exposed thereto;
- and
- means for selectively allowing the reflector to be exposed to the light emitted by the light emitting source.
An optical marker for use in accordance with an electronic whiteboard system, the electronic whiteboard system including a light emitting source, the optical marker comprising:
- a reflector for reflecting at least a portion of light emitted from the light emitting source when exposed thereto;
- and
- a substance layer interposed between the reflector and the light emitting source for at least partially blocking transmission of the light.
A method of writing in accordance with an electronic whiteboard system, the method comprising the steps of:
- emitting light from a light emitting source associated with the electronic whiteboard system toward a reflector associated with an optical marker of the electronic whiteboard system;
- the reflector reflecting at least a portion of light emitted from the light emitting source when the reflector is exposed to the light;
- and
- selectively allowing the reflector to be exposed to the light emitted by the light emitting source.
Dependencies are inferred from the claim text.