Three-piece infrared single wavelength projection lens system
AssigneeNewmax Technology Co., Ltd.
InventorsFEI-HSIN TSAI, CHING-YUN HUANG
Life of this patent
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Abstract
A three-piece infrared single wavelength projection lens system includes, in order from an image side to an image source side: a first lens element with a positive refractive power; a second lens element with a refractive power; a third lens element with a positive refractive power; a stop disposed before an image source-side surface of the first lens element or between the image source-side surface of the first lens element and an image source-side surface of the second lens element; and the first lens element or the second lens element is made of glass. Such arrangements can provide a three-piece infrared single wavelength projection lens system with better image sensing function.
Claims17
A three-piece infrared single wavelength projection lens system, in order from an image side to an image source side, comprising:
- a first lens element with a positive refractive power, having an image-side surface being convex near an optical axis;
- a second lens element with a refractive power, having an image-side surface being convex near the optical axis;
- a third lens element with a positive refractive power, having an image-side surface being concave near the optical axis and an image source-side surface being convex near the optical axis, at least one of the image-side surface and the image source-side surface of the first lens element being aspheric;
- a stop disposed before an image source-side surface of the first lens element or between the image source-side surface of the first lens element and an image source-side surface of the second lens element;
- and
- wherein the first lens element or the second lens element is made of glass.
Dependencies are inferred from the claim text.