Light sources for digital pen
First Claim
Patent Images
1. Apparatus comprising:
- a writing instrument including, an elongated housing configured to be hand-held, a light source in the housing, and a lens in the housing configured to receive light from the light source and convey the light through a free-air path to optical sensors spaced from the writing instrument, the lens being configured to enable light to be directed parallel to the writing surface no matter what the orientation or position of the writing instrument to the writing surface.
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Accused Products
Abstract
Motion of a writing instrument is tracked from sensors located in the vicinity. The signals generated from the sensors are processed and used in a wide variety of ways.
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Citations
16 Claims
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1. Apparatus comprising:
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a writing instrument including, an elongated housing configured to be hand-held, a light source in the housing, and a lens in the housing configured to receive light from the light source and convey the light through a free-air path to optical sensors spaced from the writing instrument, the lens being configured to enable light to be directed parallel to the writing surface no matter what the orientation or position of the writing instrument to the writing surface. - View Dependent Claims (3, 4, 5, 6, 7)
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2. Apparatus comprising:
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a writing instrument including, an elongated housing configured to be hand-held, and a light source in the housing, the light source comprising an array of light sources arranged around an axis of the writing instrument and configured to emit light in a direction normal to the axis.
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8. Apparatus comprising:
a writing instrument including, an elongated housing configured to be hand-held, and a light source in the housing, the light source being arranged to emit light in a direction parallel to a longitudinal axis of the writing instrument. - View Dependent Claims (9, 10)
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11. Apparatus comprising:
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a writing instrument;
a light-source in the writing instrument configured to convey light to sensors spaced from the writing instrument; and
a device configured to turn the light source on and off in response to a user applying pressure from the writing instrument to a writing surface, the switch being configured so that an amount of pressure required to trigger the switch is not so large as to disrupt normal writing motion of the writing instrument on the writing surface. - View Dependent Claims (12, 13, 14)
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15. Apparatus comprising:
a writing instrument and a sensor, the writing instrument including a reflective element configured to reflect light received from outside of the writing instrument to the sensor for use in tracking motion of the writing instrument. - View Dependent Claims (16)
Specification