| 摘要 |
A virtual data entry device including an illuminator generating a generally planar beam of light and an impingement sensor assembly operative to sense at least one location of impingement of the planar beam of light by at least one object, the impingement sensor assembly including at least one optical element arranged to receive light from the planar beam reflected by the at least one object, the at least one optical element having optical power in a first direction such that it focuses light at at least one focus line location, which the at least one focus line location is a function of the location of the at least one object relative to the at least one optical element and a multi-element detector arranged to receive light passing through the at least one optical element, wherein the distribution of the light detected by the multi-element detector among multiple elements thereof indicates the location of the at least one object.
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