SUPER WIDE-ANGLE LENS DEVICE

PURPOSE:To provide the super wide-angle lens device which consists of a small number of lens elements and has an extremely large photographic field angle and long back focus and is low in cost. CONSTITUTION:This device is constituted by arranging a 1st lens 10 composed of a negative meniscus lens, a...

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Bibliographic Details
Main Authors SATO MASAE, YOKOTA MINORU
Format Patent
LanguageEnglish
Published 10.02.1994
Edition5
Subjects
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:PURPOSE:To provide the super wide-angle lens device which consists of a small number of lens elements and has an extremely large photographic field angle and long back focus and is low in cost. CONSTITUTION:This device is constituted by arranging a 1st lens 10 composed of a negative meniscus lens, a 2nd positive lens 20, and a 3rd lens 30 composed of a positive meniscus lens in order from an object side and a space for stop arrangement is formed between the 2nd lens and 3rd lens; and a condition (1) -2.2f<f1<-1.4f, a condition (2) 1.2f<f3<2.2f, and a condition (3) 0.45f<d4<0.09f are satisfied, where (f) is the total focal distance, f1 the focal distance of the 1st lens, f3 the focal distance of the 3rd lens, and d4 the interval between the image-side surface of the 2nd lens and the object-side surface of the 3rd lens.
Bibliography:Application Number: JP19920212340