Infrared zooming lens
OwnerKouji Kawaguchi, Minoru Andoinventors
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Abstract
The present invention is directed to an infrared zoom lens that has one or more of its lens pieces made of chalcogenide tractable in processing such as press-molding, grinding, and the like, so as to facilitate compensating for spherical aberration that is generally hard to do, thereby producing a clear and vivid image. The infrared zoom lens has first to fourth lens elements arranged in series from the foremost position closest to the object; each of the first to fourth lens elements being of a single lens piece, and at least one of the first to fourth elements is made of chalcogenide.
Claims22
An infrared lens comprising first to fourth lens elements arranged in series from the foremost position closest to the object;
- each of the lens element being of a single lens piece, and at least one of the first to fourth lens elements being made of chalcogenide.
An infrared lens having first to fourth lens elements arranged in series from the foremost position closest to the object;
- each of the first to fourth lens elements being of a single lens piece, at least one of the first to fourth lens elements being made of chalcogenide that meets requirements as defined in the following formulae:
- 2.4≦N≦3.9
- where N is a refractive index of the chalcogenide for incident light ranging from 8 to 12 μm in wavelength.
Dependencies are inferred from the claim text.