OPTICAL LENS

An optical lens comprises in order from an object side to an image-forming side, a first lens group having positive refractive power and a second lens group having negative refractive power. The second lens group comprises a third lens and a fourth lens. The optical lens satisfies at least one of th...

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Bibliographic Details
Main Authors Chang, Yu-Min, Chen, Jung-Yao
Format Patent
LanguageEnglish
Published 21.06.2018
Subjects
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:An optical lens comprises in order from an object side to an image-forming side, a first lens group having positive refractive power and a second lens group having negative refractive power. The second lens group comprises a third lens and a fourth lens. The optical lens satisfies at least one of the following conditions: a thickness of the first lens group is less than a first distance between the first lens group and the second lens group, and |δ7/D4|≥2. The second distance is between a projected position which an effective diameter of an object-side surface of the fourth lens projected on an optical axis and a first intersection point which the object-side surface of the fourth lens and the optical axis is δ7, and a thickness of the fourth lens is D4.
Bibliography:Application Number: US201815896022