OPTICAL SYSTEM, AN ANALYSIS SYSTEM AND A MODULAR UNIT FOR AN ELECTRONIC PEN
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United States of America Patent
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Issued Date -
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app pub date -
Sep 9, 2010
filing date -
Dec 15, 2003
priority date (Note) -
Abandoned
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Abstract
A modular unit is designed for an electronic pen. The modular unit comprises a carrier with a receiver for a writing implement, a printed circuit board, a two-dimensional radiation sensor mounted on the printed circuit board, and an imaging unit which defines an image plane. The carrier, the printed circuit board, and the imaging unit are joined together with the imaging unit facing the radiation sensor to locate the image plane at the radiation sensor. A radiation source, such as an LED or a laser diode, may be arranged on the printed circuit board or mounted in a holder on the imaging unit. The imaging unit may be implemented as a boresight unit for controlling the spatial origin of radiation transmitted towards the radiation sensor. The boresight unit may comprise a radiation-transmitting channel, an imaging lens, and a redirecting mirror in the channel.
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