FIXED FOCAL POINT PROJECTION LENS

PURPOSE: To provide a fixed focal point projection lens that can maintain an excellent quality of pictures in a situation in which the total length of a system is limited.SOLUTION: The fixed focal point projection lens includes a first lens group and a second lens group. The first lens group and the...

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Bibliographic Details
Main Authors CHANG SHUOIEH, LEE MING-LIN, CHEN HSIN-TE
Format Patent
LanguageEnglish
Japanese
Published 04.01.2023
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Summary:PURPOSE: To provide a fixed focal point projection lens that can maintain an excellent quality of pictures in a situation in which the total length of a system is limited.SOLUTION: The fixed focal point projection lens includes a first lens group and a second lens group. The first lens group and the second lens group are divided at the position (diaphragm) where the inner diameter of a lens barrel is the smallest. The first lens group includes 6-8 lenses with a refractive power and two aspherical lens surfaces. The second lens group has a positive refractive power, and includes 5-8 lenses with a refractive power and two joint surfaces. The lenses with a reflection power are all spherical lenses.SELECTED DRAWING: Figure 1 【目的】システム全長が制限される状況において、優れた映像品質を維持することのできる固定焦点投影レンズを提供する。【解決手段】固定焦点投影レンズは、第1レンズ群および第2レンズ群を含み、第1レンズ群および第2レンズ群は、鏡筒の内径が最も小さい位置(絞り)で分割される。第1レンズ群は、屈折力を有する6~8枚のレンズを含み、且つ2つの非球面レンズ表面を含む。第2レンズ群の屈折力は、正であり、第2レンズ群は、屈折力を有する5~8枚のレンズを含み、且つ2つの接合面を含む。上述した屈折力を有するレンズは、いずれも球面レンズである。【選択図】図1
Bibliography:Application Number: JP20210139081