Short TTL camera lens of big angle of vision

The utility model discloses a short TTL camera lens of big angle of vision, including aperture stop, 4 lens and light filter, first piece lens and third piece lens have a positive refractive power, and second piece lens and fourth piece lens have a negative optical power, and the thing side optical...

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Bibliographic Details
Main Authors QIU XIAOXIONG, SUN WEI
Format Patent
LanguageChinese
English
Published 08.06.2018
Subjects
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:The utility model discloses a short TTL camera lens of big angle of vision, including aperture stop, 4 lens and light filter, first piece lens and third piece lens have a positive refractive power, and second piece lens and fourth piece lens have a negative optical power, and the thing side optical surface of second piece lens and picture incline the optical surface and be the concave surface, thething side optical surface of third piece lens is the concave surface, is the convex surface like the side optical surface, fourth piece lens accessory things side direction looks like to look sideways and is M shape, satisfy following condition: 0.2&lt, (D1+d2+d3, ) ih&lt, 0.4, 0.5&lt, (T1+T2+T3+T4, ) ih&lt, 0.8 D1 is the air gap between first piece lens and second piece lens, and d2 be the airgap of between second piece lens and third piece lens, and d3 is third piece lens and fourth piece lens air gap within a definite time, and T1 is the central thickness of 4 lens to T4, and ih is the biggest image height. The u
Bibliography:Application Number: CN201721431004U