Lens for scanning devices
It is a lens comprising three elements for a scanning device; the lens is particularly for providing a linear scanning. A beam enters the lens from its front focus by rotating a constant angular velocity, will become a beam in parallel with the axis of the lens and moving at a contant speed when pas...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | It is a lens comprising three elements for a scanning device; the lens is particularly for providing a linear scanning. A beam enters the lens from its front focus by rotating a constant angular velocity, will become a beam in parallel with the axis of the lens and moving at a contant speed when passing through the lens; the distance H between the beam and the axis of the lens, the contained angle theta between the incident beam and the axis of the lens have the relation of H=KF theta , in which F is the focal length of the lens, and K is a constant. |
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