Wide-angle lens
A wide-angle lens and lens technology, applied in the field of optical systems, can solve the problems of large chromatic aberration and long lens length of ultra-wide-angle lenses
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[0031] Please refer to figure 1 , The one shown is the first embodiment of the present invention. The wide-angle lens includes a first lens 10, a second lens 20, and a third lens 30 in order from the object side A to the image side B on the optical axis L. An aperture ST, a fourth lens 40 and a fifth lens 50. A CCD, CMOS or other photosensitive element (not shown) is arranged on the image side B. A filter may be arranged between the photosensitive element and the fifth lens 50. Flat lenses 60 such as light sheets and / or protective glass, and the number of flat lenses 60 can be increased or decreased or not provided according to requirements.
[0032] In this embodiment, the first lens 10 has negative refractive power, the object side is convex and the image side is concave, and the curvature radius of the object side is positive and larger than the curvature radius of the image side. The first lens 10 made of plastic has a Both the object side and the image side can be aspherical...
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