Compact image taking lens system with a lens-surfaced prism
First Claim
1. A compact image taking lens system with a lens-surfaced prism comprising from an object side to an image side:
- a) a prism having a concave surface on the abject side, an internal reflective surface, and a surface on the image side;
b) an aperture stop;
c) a first lens element having a negative optical refractive power, wherein the first lens element has both side aspheric surfaces on the object side and on the image side;
d) a second lens element having a positive optical refractive power; and
e) an image surface, wherein the image taking lens system makes image on the image surface.
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Accused Products
Abstract
A compact image taking lens system with a lens-surfaced prism of the present invention comprises a prism, an aperture stop, a first lens element, a second lens element, reflecting mirror surface, and image surface, optionally an infrared cut-off filter. By introducing a lens-surfaced prism, the compact image taking lens system with a lens-surfaced prism of the present invention has many advantages over the prior arts in the field of invention, such as compactness in thickness, small number of optical elements, high performance of optical quality, enough space for optional elements such as an infrared cut-off filter and diversity in optical geometries.
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Citations
28 Claims
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1. A compact image taking lens system with a lens-surfaced prism comprising from an object side to an image side:
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a) a prism having a concave surface on the abject side, an internal reflective surface, and a surface on the image side; b) an aperture stop; c) a first lens element having a negative optical refractive power, wherein the first lens element has both side aspheric surfaces on the object side and on the image side; d) a second lens element having a positive optical refractive power; and e) an image surface, wherein the image taking lens system makes image on the image surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A compact image taking lens system with a lens-surfaced prism comprising from an object side to an image side:
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a) a prism having a concave surface on the object side, an internal reflective surface, and a surface on the image side, wherein both sides of the object side and the image sides are aspheric; b) an aperture stop; c) a first lens element, wherein the first lens element is a negative optical refractive power meniscus shape lens with a convex on the object side, wherein the first lens element is made of plastic with at least one aspheric surface on the object side surface and the image side surface; d) a second lens element having a positive optical refractive power; e) a reflective surface to reduce thickness of the compact image taking lens system; and f) an image surface, wherein the image taking lens system makes image on the image surface. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A compact image taking lens system with a lens-surfaced prism comprising from an object side to an image side:
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a) a prism having a concave surface on the object side, an internal reflective surface, and a concave surface on the image side; b) an aperture stop; c) a first lens element, wherein the first lens element is a negative optical refractive power meniscus shape lens with a convex on the object side, wherein the first lens element is made of plastic with at least one aspheric surface on the object side surface and the image side surface; d) a second lens element having a positive optical refractive power with a convex on the object side, wherein the second lens element is made of plastic with Abbe number larger than 45.0; e) a reflective surface to reduce thickness of the compact image taking lens system; and f) an image surface, wherein the image taking lens system makes image on the image surface. - View Dependent Claims (25, 26, 27, 28)
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Specification