Asphericity eyeglass

An aspherical, spectacle lens technology, applied in the field of myopia, hyperopia, and aspherical spectacle lenses, can solve the problems of increasing design difficulty, increasing the thickness of the lens, discomfort for the wearer, etc. The effect of symmetry

Inactive Publication Date: 2003-04-23
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Spectacle lenses used to correct nearsightedness or hyperopia are usually lenses that include two refractive surfaces. The two refractive surfaces of traditional lenses are spherical, which is convenient for processing. Hyperopia glasses are thicker in the middle and thinner at the edge. Due to the strength requirements for the thinnest part of the lens, the thickness of the entire lens is increased, which not only affects the appearance, but also causes discomfort to the wearer.
In order to solve this problem, people began to design aspherical spectacle lenses to offset the overall thickening of the lenses caused by the thickness of the center and edge of the lenses formed by two different curvature spherical surfaces. For example, Chinese invention patent application CN1212766A discloses a For a

Method used

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  • Asphericity eyeglass

Examples

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Embodiment 1

[0017] Embodiment one: a kind of aspherical myopia lens, power is-4D, and outer diameter is φ 70 millimeters, and getting outer surface is 0.5D, and surface shape is the aspheric surface expressed by following formula; Inner surface is-4.5D, and surface shape for the sphere. The expression for the shape of the outer surface is, z ( r ) = cr 2 1 + 1 - c 2 r 2 + a 1 r 4 + a 2 r 6 + a 3 r 8 + a ...

Embodiment 2

[0023] Embodiment two: a kind of aspherical hyperopia lens, power is 4D, and outer diameter is φ 70 millimeters, and getting outer surface is 5.0D, and surface shape is the aspheric surface expressed by following formula; Inner surface is-1.0D, and surface shape is sphere. The expression for the shape of the outer surface is, z ( r ) = cr 2 1 + 1 + - c 2 r 2 + a 1 r 4 + a 2 r 6 + a 3 r 8 + ...

Embodiment 3

[0029] Embodiment three: a kind of aspherical myopia lens, power is-4D, outer diameter is φ70 millimeter, gets outer surface and is 0.5D, and surface shape is spherical; Inner surface is-4.5D, and surface shape is expressed by the following formula Aspherical. The expression for the inner surface shape is, z ( r ) = cr 2 1 + 1 - c 2 r 2 + a 1 r 4 + a 2 r 6 + a 3 r 8 + a 4 ...

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Abstract

The present invention discloses an aspherical lens, including two refracting surface, in which at least one refracting surface is aspherical surface. Said invention also provides a formula for solve its form, and can obvisouly thin the lens, and make the field curvature superpose on the bend of far point spherical surface basically so as to make lens obtain excellent imaging quality.

Description

technical field [0001] The invention relates to an spectacle lens, in particular to an aspherical spectacle lens. By selecting the shape of the aspheric surface, the effect of better imaging quality and thinner thickness of the lens can be achieved, and the spectacle lens can be applied to nearsighted glasses and farsighted glasses. Background technique [0002] Spectacle lenses used to correct nearsightedness or hyperopia are usually lenses that include two refractive surfaces. The two refractive surfaces of traditional lenses are spherical, which is convenient for processing. Hyperopia glasses are thicker in the middle and thinner at the edge. Due to the strength requirement for the thinnest part of the lens, the thickness of the entire lens is increased, which not only affects the appearance, but also causes discomfort to the wearer. In order to solve this problem, people began to design aspherical spectacle lenses to offset the overall thickening ...

Claims

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Application Information

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IPC IPC(8): G02C7/06
Inventor 郭培基余景池
Owner SUZHOU UNIV
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