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US 4,307,929 AGranted
Method of scanning a laser beam in a straight line
OwnerJason H. Evelethinventor
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Abstract
A method of scanning a laser beam in a straight line is disclosed wherein a series of different frequency overlapping signals are applied to a first axis transducer of an acousto-optic modulator and a slowly varying frequency signal is applied to a second axis transducer of the acousto-optic modulator to generate a parallelogram matrix scan of a format converter which converts the scan to a linear scan focused in an image plane.
Claims1
A method of scanning a laser beam in a straight line comprising the steps of:
- generating a laser beam in a direction along a first axis;
- applying a series of different frequency overlapping signals to a first axis transducer of an acousto-optic cell to produce corresponding first series acoustic signals in said acousto-optic cell;
- applying a slowly-varying frequency signal to a second axis transducer of said acousto-optic cell to produce a corresponding second series acoustic signals orthogonal to said first series acoustic signals in said acousto-optic cell;
- deflecting said laser beam responsive to said first and second acoustic signals in a pattern to scan a format converter arranged in a parallelogram matrix;
- converting the scan of the parallelogram matrix by said laser beam to a linear scan;
- and
- focusing said linear scan in an image plane.
4 more elements
Dependencies are inferred from the claim text.