US 7,832,641 B2Granted

Scanner switched to active state by sensed movement in quiescent scanning mechanism

AssigneeMetrologic Instruments, Inc.

InventorsRobert E. Blake, Donald T. Hudrick, David M Wilz, Sr., Stephen Colavito

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Abstract

The disclosure generally relates to a method and apparatus for determining if an optical scanner is moving. In one embodiment the method for sensing movement of an optical scanner comprises the steps of providing an oscillating system comprising a flexible member, a magnet coupled to the flexible member, a coil disposed within a magnetically effective distance from the magnet, and sense circuitry coupled to the coil; generating a first electrical signal from the oscillations of the flexible member; amplifying the generated electrical signal; analyzing the first electrical signal to determine if the generated signal is indicative of movement of the optical scanner.

Claims11

Dependent claims

A method for controlling an optical scanner having a housing, a movable oscillating element and an electrically operated drive mounted within said housing and wherein said movable oscillating element is mounted resiliently relative to said housing and said housing is subject to manual movement, and wherein said electronically operated drive includes a sleep state, an active state, a sense coil to sense active movement of said movable oscillating element, and a drive coil to periodically move said movable oscillating element over a path, said method comprising the steps of:

(a) said sense coil sensing the active movement of said movable oscillating element within said housing in response to movement of said housing, and automatically generating a sense signal;
(b) in response to the generation of said sense signal, said electronically operated drive automatically switching from said sleep state to said active state, and generating a drive signal causing said drive coil to generate electromagnetic forces causing said movable oscillating element to periodically move over said path;
and
(c) said sense coil detecting when the movement of said movable oscillating element over said path dissipates and, in response thereto, said electronically operated drive automatically returning to said sleep state.

1 more element

An optical scanning apparatus, comprising:

a housing;
a flipper assembly including a flexible member with a fixed end affixed to said housing, said flexible member carrying a reflector spaced from said fixed end and a weight spaced from said fixed end, and said flipper assembly being configured to oscillate resiliently relative to said fixed end when perturbed, for varying an angle of the reflector during periodic scanning;
an electronically operated drive circuit including
(i) a sense coil for sensing active movement of said flexible element within said housing in response to movement of said housing, and generating a sense signal in response to sensed motion of said flipper element, and
(ii) a drive coil for generating electromagnetic forces causing said flipper element to oscillate over a path in response to the generation of a drive signal provided to said drive coil;
a control circuit for enabling said electronically operated drive circuit during an active state, and disabling said electronically operated drive circuit during a sleep state,
wherein during said active state, said electronically operated drive circuit is enabled and driving said drive coil and causing said flipper element to oscillate over said path, and
wherein during said sleep state, said electronically operated drive circuit is disabled and thereby permitting said flipper element to cease oscillation over a predetermined period of time;
and
wherein said control circuit switches from said sleep state to said active state when said sense coil senses active movement of said flipper element within said housing and generates said sense signal;
and
wherein said control circuit switches from said active state to said sleep state when said sense coil senses that the oscillation of said flipper element over said path has dissipated.

9 more elements

Dependencies are inferred from the claim text.