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wide angle lens

A wide-angle lens, lens technology, applied in optical elements, instruments, optics, etc., can solve the problem of the limitation of the requirement of improving the resolution at the center part, and achieve the effect of small dispersion and improvement of axial chromatic aberration

Active Publication Date: 2020-04-14
NIDEC SANKYO (DONGGUAN) PRECISION CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the wide-angle lens described in Patent Document 1, there is a limit to the requirement for resolution improvement at the center portion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0031] figure 1 It is a sectional view showing the lens unit 200 including the wide-angle lens 100 according to Embodiment 1 of the present invention.

[0032] figure 2 yes figure 1 An explanatory diagram of the wide-angle lens 100 shown, figure 2 of (a), figure 2 of (b), figure 2 (c) is an explanatory diagram showing a lens structure, an explanatory diagram showing spherical aberration, and an explanatory diagram showing lateral chromatic aberration, respectively. image 3 yes means figure 1 An explanatory diagram of the aberration characteristics of the wide-angle lens shown, image 3 of (a), image 3 of (b), image 3 (c) is an explanatory diagram showing astigmatism and the like, and an explanatory diagram showing lateral aberration, respectively. In addition, in figure 2 When each surface 1-9 is shown in (a), "*" is attached|subjected to an aspheric surface. exist figure 2 of (b), figure 2 (c) and image 3 (a) shows the aberrations in red light R (wave...

Embodiment approach 2

[0088] Figure 4 It is an explanatory diagram of the wide-angle lens 100 according to Embodiment 2 of the present invention, Figure 4 of (a), Figure 4 of (b), Figure 4 (c) is an explanatory diagram showing a lens structure, an explanatory diagram showing spherical aberration, and an explanatory diagram showing lateral chromatic aberration, respectively. Figure 5 yes means Figure 4 An explanatory diagram of the aberration characteristics of the wide-angle lens shown, Figure 5 of (a), Figure 5 of (b), Figure 5 (c) is an explanatory diagram showing astigmatism and the like, and an explanatory diagram showing lateral aberration, respectively. exist Figure 5 (b) shows lateral aberrations in two directions (y direction and x direction) perpendicular to the optical axis at angles of 0.00°, 12.09°, 23.88°, 35.17°, 46.00°, and 56.44°.

[0089] Such as Figure 4 As shown, the wide-angle lens 100 of this embodiment also has the first lens 10 , the second lens 20 , the a...

Embodiment approach 3

[0121] Figure 6 It is an explanatory diagram of the wide-angle lens 100 according to Embodiment 3 of the present invention, Figure 6 of (a), Figure 6 of (b), Figure 6 (c) is an explanatory diagram showing a lens structure, an explanatory diagram showing spherical aberration, and an explanatory diagram showing lateral chromatic aberration, respectively. Figure 7 yes means Figure 6 An explanatory diagram of the aberration characteristics of the wide-angle lens shown, Figure 7 of (a), Figure 7 of (b), Figure 7 (c) is an explanatory diagram showing astigmatism and the like, and an explanatory diagram showing lateral aberration, respectively. exist Figure 7 (b) shows lateral aberrations in two directions (y direction and x direction) perpendicular to the optical axis when the angles are 0.00°, 12.12°, 23.91°, 35.18°, 46.00°, and 56.55°.

[0122] Such as Figure 6 As shown, the wide-angle lens 100 of this embodiment also has the first lens 10 , the second lens 20 ...

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Abstract

PROBLEM TO BE SOLVED: To provide a wide-angle lens that offers improvement in axial chromatic aberration.SOLUTION: A wide-angle lens 100 consists of a first lens 10, second lens 20, aperture stop 40, and third lens 30 arranged in order from the object side. The first lens 10 is a negative meniscus lens with at least one aspherical surface and has a convex surface facing the object side. The second lens 20 is a positive meniscus lens with at least one aspherical surface and has a convex surface facing the image side. The third lens 30 is a positive lens with at least one aspherical surface and has a convex surface facing the image side. Abbe numbers ν1, ν2, and ν3 are all greater than 50, where ν1 represents an Abbe number of the first lens 10, ν2 represents an Abbe number of the second lens 20, and ν3 represents an Abbe number of the third lens 30.SELECTED DRAWING: Figure 2

Description

technical field [0001] The present invention relates to a wide-angle lens used in an intercom system at a main entrance and the like. Background technique [0002] As a lens installed in a surveillance camera, a vehicle camera, a camera for a portable device, etc., a three-group three-lens lens in which a first lens, a second lens, a diaphragm, and a third lens are sequentially arranged from the object side has been proposed. block lens. In the above-mentioned wide-angle lens, in order to achieve cost reduction and thinning, plastic lenses with relatively high refractive indices are used for the first lens, the second lens, and the third lens (see Patent Document 1). In addition, a biconvex lens in which both the object side and the image side lens surfaces are convex is used in the second lens. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2014-209190 [0006] Since a lens with a higher refractive inde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B13/06G02B13/18
Inventor 小宫山忠史
Owner NIDEC SANKYO (DONGGUAN) PRECISION CORPORATION