An optical lens includes a first lens group and a second lens group. The first lens group includes a first lens, a second lens, and a third lens arranged in sequence from a magnified side towards a reduced side. Refractive powers of the first lens, the second lens, and the third lens are negative, negative and positive respectively. The third lens is a glass lens. The second lens group is disposed between the first lens group and the reduced side. The second lens group includes a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the magnified side towards the reduced side. Refractive powers of the fourth lens, the fifth lens, and the sixth lens are positive, negative and positive respectively. The first lens, the second lens, the fourth lens, the fifth lens and the sixth lens are plastic lenses.
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Published patent application
Disclosure date: 08-03-2017
Publication date: 02-14-2018
Applicant: CORETRONIC CORP, TW
Inventor: CHUANG FU-MING, TW ; LO HSIN-HSIANG, TW
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