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US 5,515,206 AGranted
Multi-facet lens component
AssigneesGentle Peng, Chieh-Yu Lin, Wei-Chang W. Liauh
InventorGentle Peng
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AssigneesGentle Peng, Chieh-Yu Lin, Wei-Chang W. Liauh
InventorGentle Peng
Estimating the term…
A multi-facet lens member for use in an optical device such as a conventional camera or a video camera, comprising: (a) a multi-facet optical lens having at least four optical surfaces arranged in at least two pairs, each pair of the optical surfaces being adapted to provide a predetermined effective focal length in a light path; and (b) a rotational member for rotating the multi-facet optical lens so as to position a desired pair of the optical surfaces in the light path and provide a desired effective focal length for the optical device. The multi-facet optical lens member can be used alone or in conjunction with other conventional optical lens to obtain optimum effect. In an example embodiment of a fouri-facet lens member, one arrangement of the optical surfaces provides an effective focal length of 25 mm, thus representing a wide-angle lens. By a simple 90 degrees rotation of the lens member, an effective length of 90 mm can be obtained, thus representing a telephoto lens, from the same optical device.
A multi-facet lens member for use in an optical device, comprising:
An optical instrument with adjustable effective focal lengths containing a multi-facet lens member, said multi-facet lens member comprising:
A method for adjusting focal length in an optical device comprising the steps of
Dependencies are inferred from the claim text.