A 3p super wide-angle lens
An ultra-wide-angle lens and lens technology, applied in the optical field, can solve the problems of long lens length, increased cost, and complicated process assembly
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no. 1 example
[0026] see figure 1 , figure 1 It is a 3P super wide-angle lens provided by the first embodiment of the present invention. The 3P super wide-angle lens used under the ultra-fine object distance includes: a first lens, a second lens, a third lens, a filter located on the image side of the third lens, and an imaging surface arranged sequentially from the object side to the image side , the first lens is a negative lens, the surface of the first lens near the object side is P1R1, the center of the surface P1R1 is concave toward the object side, the surface of the first lens near the image side is called P1R2, and the center of the surface P1R2 is concave toward the image The side edge turns concave to the image side, the second lens is a positive lens, the surface of the second lens close to the object side is P2R1, the center of the surface P2R1 is convex to the object side, and the surface of the second lens P2 close to the image side is called P2R2. The center of the surface...
no. 2 example
[0045] The second embodiment is a counter-example introduced.
[0046] The shape of each lens in the second embodiment is: the first lens P1 is a negative lens (the surface of P1 close to the object side is called P1R1, and its center is concave to the object side, and the surface of P1 close to the image side is called P1R2 , whose center is concave toward the image side.
[0047] The second lens P2 is a positive lens (the side of P2 near the object side is called P2R1, and its center is convex toward the object side, and the side of P2 near the image side is called P2R2, and its center is concave toward the image side, and its core Thickness is T2).
[0048] The third lens P3 is a positive lens (the surface of P3 close to the object side is called P3R1, and its center is concave toward the object side, and the side of P3 close to the image side is called P3R2, and its center is convex toward the image side).
[0049] That is, the shapes of the three lenses of the second em...
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