Origin detector in image scanner
AssigneeSharp Kabushiki Kaisha
InventorsKazunori Miyamoto, Kenji Nakanishi, Kenji Tanaka, Kazuya Masuda
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Abstract
An apparatus according to the present invention includes a stepping motor (5) and a motor drive circuit (4) for first moving a lamp unit to hit the unit against a reference object opposite to an origin and then moving the unit toward the origin, a CPU (3) for measuring the distance through which the lamp unit is moved from the reference object toward the origin, and the CPU (3) for controlling the lamp unit so that the lamp unit stops at the origin according to the distance measured from the reference object.
Claims4
An origin detector used for an image scanner, for detecting an origin for a movably installed lamp unit with a light source for reading an original, said origin detector comprising:
- moving means for first moving said lamp unit in a first direction so said lamp unit hits against a reference object, the reference object being disposed opposite to the origin, and then moving said lamp unit in a second direction away from said reference object toward the origin,
- means for measuring a distance through which the lamp unit is moved in said second direction, and
- means for controlling said moving means, responsive to the distance measured by said measuring means so said lamp unit is stopped a specified distance from said reference object, whereby said lamp unit is disposed at the origin.
Dependencies are inferred from the claim text.