US 2019/0293904 A1Published application

Four-piece infrared single wavelength projection lens system

AssigneeNewmax Technology Co., Ltd.

InventorsFEI-HSIN TSAI, CHING-YUN HUANG

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Abstract

A four-piece infrared single wavelength projection lens system in accordance with the present invention comprises, in order from an image side to an image source side: a stop; a first lens element with a positive refractive power having an image-side surface being convex near an optical axis, the first lens element is made of glass material; a second lens element with a refractive power having an image-side surface being convex near the optical axis and an image source-side surface being concave near the optical axis; a third lens element with a negative refractive power having an image-side surface being concave near the optical axis and an image source-side surface being concave near the optical axis; and a fourth 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.

Claims18

Dependent claims

A four-piece infrared single wavelength projection lens system, in order from an image side to an image source side, comprising:

a stop;
a first lens element with a positive refractive power, having an image-side surface being convex near an optical axis, at least one of the image-side surface and an image source-side surface of the first lens element being aspheric, the first lens element being made of glass;
a second lens element with a refractive power, having an image-side surface being convex near the optical axis and an image source-side surface being concave near the optical axis, at least one of the image-side surface and the image source-side surface of the second lens element being aspheric;
a third lens element with a negative refractive power, having an image-side surface being concave near the optical axis and an image source-side surface being concave near the optical axis, at least one of the image-side surface and the image source-side surface of the third lens element being aspheric;
and
a fourth 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 fourth lens element being aspheric.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/936,411Filed 26 Mar 2018
Published: 26 Sep 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G02B 13/14
Optical objectives specially designed for the purposes specified below: for use with infrared or ultraviolet radiation
G02B 9/34
Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -: having four…
G02B 13/004
Having at least one aspherical surface: having four lenses
G02B 13/008
Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras: designed for infrared light