Wide-angle lens with 2.6mm fixed focus
A wide-angle lens and lens technology, applied in optical components, optics, instruments, etc., can solve the problems of low optical performance index, difficult to achieve large wide-angle, and small number of day and night confocal lenses, and achieve a simplified optical structure and high resolution. , the effect of reducing production costs
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[0014] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0015] Such as Figure 1~3 As shown, a 2.6mm fixed-focus wide-angle lens, the optical system of the lens is provided with the front group A of the lens group and the rear group B of the lens group with opposite refractive powers along the incident direction of the light from left to right. A diaphragm C is set between group A and rear group B, the front group A includes biconcave lens A-1 and biconvex lens A-2 arranged in sequence from left to right; the rear group B includes The double-convex lens B-1 and the negative crescent-shaped sheet lens B-2 are set as a cemented group in close contact.
[0016] In this embodiment, the radii of curvature on both sides of the biconvex lens A-1 are 49.89 mm and 3.10 mm respectively, the radii of curvature on both sides of the biconvex lens A-2 are 9.03 mm, and the two sides of the biconvex lens B-1 are ...
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