Image forming apparatus including position detector
First Claim
1. An image forming apparatus, comprising:
- a movable member configured to move cyclically in synchronization with an image forming process; and
a position detector comprising;
a scale attached to the movable member and including a plurality of optical marks formed in line at a substantially constant interval, an image sensor configured to capture data relating to at least one of the plurality of optical marks at a time, a signal processor configured to determine a coordinate of an optical mark with respect to a reference position using the data captured by the image sensor, and a position computing unit configured to compute a distance traveled by the optical mark based on a number of the optical marks that pass the reference position and the coordinate of the optical mark with respect to the reference position.
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Accused Products
Abstract
An image forming apparatus includes a movable member that moves cyclically in synchronization with an image forming process and a position detector. The position detector includes a scale, an image sensor, a signal processor, and a position computing unit. The scale is attached to the movable member and includes a plurality of optical marks formed in line at a substantially constant interval. The image sensor captures data relating to at least one optical mark at a time. The signal processor computes a coordinate of the optical mark with respect to a reference position. The position computing unit computes a distance traveled by the optical mark based on a number of the optical marks that pass the reference position and the coordinate of the optical mark with respect to the reference position.
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Citations
9 Claims
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1. An image forming apparatus, comprising:
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a movable member configured to move cyclically in synchronization with an image forming process; and
a position detector comprising;
a scale attached to the movable member and including a plurality of optical marks formed in line at a substantially constant interval, an image sensor configured to capture data relating to at least one of the plurality of optical marks at a time, a signal processor configured to determine a coordinate of an optical mark with respect to a reference position using the data captured by the image sensor, and a position computing unit configured to compute a distance traveled by the optical mark based on a number of the optical marks that pass the reference position and the coordinate of the optical mark with respect to the reference position. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A position detector, comprising:
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a scale attached to a movable member and including a plurality of optical marks formed in line at a substantially constant interval;
an image sensor configured to capture data relating to at least one of the plurality of optical marks at a time;
a signal processor configured to determine a coordinate of an optical mark with respect to a reference position using the data captured by the image sensor; and
a position computing unit configured to compute a distance traveled by the optical mark based on a number of the optical marks that pass the reference position and the coordinate of the optical mark with respect to the reference position.
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9. A travel detector for detecting a rotation speed and a position of a rotationally movable member, comprising:
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a scale attached to a rotationally movable member and including a plurality of optical marks formed in line at a substantially constant interval;
an image sensor configured to capture data relating to at least one of the plurality of optical marks at a time;
a signal processor configured to determine a coordinate of an optical mark with respect to a reference position using the data captured by the image sensor; and
a position computing unit configured to compute a distance traveled by the optical mark based on a number of the optical marks that pass the reference position and the coordinate of the optical mark with respect to the reference position.
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Specification