Focussing device for a bar code reader
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United States of America Patent
Stats
-
Feb 7, 1995
Grant Date -
N/A
app pub date -
May 12, 1992
filing date -
May 13, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A focussing device for a bar code reader comprises a lens system and a drive therefor. The lens system comprises at least one lens or set of lenses moveable in the direction of its optical axis. The drive comprises at least one coil and a magnetic element, wherein at least one moveable lens or set of lenses is fixed to the magnetic element and the magnetic element is a magnetic ring slideably arranged in a holding element, and wherein said at least one coil is fixed relative to the holding element. The lens system may comprise at least two fixed lenses or sets of lenses, at least one moveable lens or set of lenses being arranged between two fixed lenses or sets of lenses. A gating device selectively passes signals output by a sensor that senses light scattered by a bar code passing through the focussing device.
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