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US 5,305,125 AGranted
Method of recording holograms for use in optical scanners
AssigneeOpticon Sensor Europe B.V.
InventorKe-Ou Peng
Life of this patent
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Abstract
A method of recording holograms for use in optical scanners comprises the steps of generating a reference beam by means of a reference source, generating an object beam by means of an object source, and illuminating a photosensitive surface with both said object beam and said reference beam, wherein said object beam is divergent in a first direction and non-divergent in a second direction.
Claims7
A scanning device comprising:
- a first mirror means drivingly connected to a motor by a hollow shaft;
- a light source to generate a light beam and to direct said light source to the first mirror means through said hollow shaft;
- stationary holographic means comprising at least one stationary holographic facet,
- wherein, during operation, the first mirror means is rotated by the motor and said light beam is reflected by said rotating mirror means to sweep across each stationary holographic facet to generate a scanning pattern of at least one line, and
- wherein each holographic facet is produced by means of at least the following process steps:
- a. generating a reference beam by means of a reference source,
- b. generating an object beam, which is focused to a line focus by appropriate focusing means, which line focus is then diverged in a first direction and is non-diverged in an orthogonal second direction, and
- c. illuminating a photosensitive surface with both said reference beam and said object beam.
5 more elements
Dependencies are inferred from the claim text.