Improved structure of short focus projection lens

The utility model provides an improved structure of a short focus projection lens. The improved structure comprises a lens body, a lens barrel and a base. The base is located below the lens barrel. The lens body is sleeved in the lens barrel. The lens body is composed of lenses from first to sixteen...

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Bibliographic Details
Main Authors CHEN HAO, YOU ZHICHENG, GUO HAIQUN
Format Patent
LanguageEnglish
Published 29.10.2014
Subjects
ACCESSORIES THEREFOR
APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES
APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM
CINEMATOGRAPHY
ELECTROGRAPHY
HOLOGRAPHY
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHOTOGRAPHY
PHYSICS
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Summary:The utility model provides an improved structure of a short focus projection lens. The improved structure comprises a lens body, a lens barrel and a base. The base is located below the lens barrel. The lens body is sleeved in the lens barrel. The lens body is composed of lenses from first to sixteenth, wherein the lenses from first to sixteenth are successively arranged side by side at interval from front to back, and comprise 12 spherical lenses and 4 aspheric lenses. The structure further comprises an irregular annular lens cover. The lens cover sleeves the first lens. According to the utility model, 3 aspheric lenses and 1 free-form surface aspheric lens are designed; short distance projection is realized; and the irregular annular dust-proof and light-leak-proof lens cover is designed, which greatly improves the projection performance of the lens.
Bibliography:Application Number: CN20142282090U