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Function curved surface lens capable of accurately focusing

A curved lens and precise focusing technology, which is applied in the direction of lenses, optics, instruments, etc., can solve the problems of limiting the application range of spherical lenses

Inactive Publication Date: 2020-05-19
杨兆强
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The condition of "paraxial rays" essentially limits the scope of application of spherical lenses in focusing parallel light beams

Method used

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  • Function curved surface lens capable of accurately focusing
  • Function curved surface lens capable of accurately focusing
  • Function curved surface lens capable of accurately focusing

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Embodiment Construction

[0087] The specific embodiment will design a piece of diameter to be the solar energy concentrating lens of the Fresnel lens form of 30 centimetres, refer to Figure 5. We can think of sunlight as beams of parallel light. The lens is made of glass, and the size of the selected glass is: 30 cm in diameter and 2 cm in thickness. Find relevant information and determine that the refractive index n of the glass is 1.65. The focal length of the designed lens is 50 cm. Considering that if the lens is made into a single-curved functional surface lens, the maximum height of the middle part of the lens will exceed 2 cm (thickness of the glass), which cannot be manufactured, so it is chosen to be made in the form of a Fresnel lens. Type A functional surface lens type. Divide the lens refraction surface line into three segments, and the X values ​​of the starting points of the three refraction surface lines are R1, R2 and R3 respectively, such as Figure 5 shown. Take the central axi...

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Abstract

A function curved surface lens capable of accurately focusing regular light beams belongs to one kind of aspheric lenses and is divided into an A type, a B type and an AA type according to different incident light beam conditions. Compared with a plano-convex spherical lens, when the function curved surface lens is used for focusing parallel light beams, focusing precision of the function curved surface lens is higher than that of the plano-convex spherical lens. An absolute value of a tangent slope of any point on a refraction curved surface of the function curved surface lens can be calculated by using a YZQ tangent formula, and coordinate values of a series of points on a refraction curved surface of the function curved surface lens can be calculated by using a differential link calculation method or a micro-decomposition equation calculation method. The function curved surface lens can also be manufactured into a form of a Fresnel lens, and the focusing precision is not influencedwhen the function curved surface lens is manufactured into the form of the Fresnel lens. Because the focusing precision of the function curved surface lens is high, the function curved surface lens can be used for manufacturing an optical instrument with high precision or manufacturing a solar condensing lens in the form of the Fresnel lens and the like.

Description

technical field [0001] The invention relates to a new type of aspherical lens which can precisely focus regular light beams. Background technique [0002] A convex spherical lens with a flat surface on one side is called a "plano-convex spherical lens", and the lens provided by the present invention is hereinafter referred to as "this lens" for short. [0003] In some occasions, the focus accuracy of the lens will directly affect the working performance of the lens. For example, the lens is used to focus sunlight. To focus parallel light beams, it is currently known to use spherical lenses to achieve. To accurately calculate the focal length of a spherical lens, all we can know and do at present is to find calculation formulas in standard textbooks. In the chapter of geometrical optics in college physics textbooks, the derivation of the spherical lens focal length calculation formula is conditional, one of the conditions is that the incident ray must be "paraxial ray". Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B3/08
CPCG02B3/08
Inventor 杨兆强
Owner 杨兆强
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