{"id":2306,"date":"2021-03-04T13:15:53","date_gmt":"2022-12-19T04:15:53","guid":{"rendered":"http:\/\/optical-tech-group.toyotec.com\/?post_type=technicalcolumn&p=2306"},"modified":"2025-01-22T19:45:22","modified_gmt":"2025-01-22T10:45:22","slug":"what-is-an-aspherical-lens-about-its-features-and-benefits","status":"publish","type":"technicalcolumn","link":"https:\/\/optical-tech-group.toyotec.com\/de\/technicalcolumn\/what-is-an-aspherical-lens-about-its-features-and-benefits\/","title":{"rendered":"Was ist eine asph\u00e4rische Linse? \u00dcber seine Funktionen und Vorteile"},"content":{"rendered":"

An aspherical lens is a lens whose lens surface is not spherical. By using lenses with aspherical surfaces, which offer a high degree of freedom in design, it becomes possible to reduce aberrations that could not be fully corrected with spherical lenses alone.<\/p>\n

In this way, aspherical lenses make it possible to reduce the size and weight of products, and even to cut costs. However, the production of aspherical lenses requires a very high level of manufacturing technology.<\/p>\n

In this section, we will explain the features, advantages \/ disadvantages, and manufacturing methods of aspheric lenses.<\/p>\n

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Principles of Light Collection and Divergence and Classification of Lenses by Surface Type<\/strong><\/h4>\n

There are many different types of lenses. They can be broadly classified as the following according to the principle of light focusing and divergence and the type of surface.<\/p>\n

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Lenses \u2460 to \u2464 are lenses that have a focusing and diverging effect solely due to refraction on the lens surface. Of these, lenses \u2460 to \u2463 have a continuous smooth surface, while lens \u2464 has a lens surface that is divided into discontinuous zones.<\/p>\n

On the other hand, in the case of \u2465, the refractive index inside the lens is not homogeneous but distributed, and in the case of \u2466, light is focused and diverged by using the diffraction effect on the surface instead of refraction.<\/p>\n

Lenses \u2461 to \u2463 are lenses with continuous, smooth, non-spherical lens surfaces and are called aspherical lenses in a broad sense. \u2461 is a lens with an aspheric surface that is axi-symmetric (rotationally symmetric) with respect to the optical axis of the lens, and is often used in imaging optical systems. Lenses \u2462 to \u2463 are aspheric lenses that do not have axisymmetry (rotational symmetry) with respect to the optical axis of the lens, and are mainly used in lighting and focusing optical systems.<\/p>\n

\uff1e\uff1eWhat Problems do Spherical Lenses Have?<\/u><\/strong><\/a><\/p>\n

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What is an Aspheric Lens?<\/strong><\/h4>\n

An aspheric lens is a lens with a non-spherical lens surface.<\/p>\n

Features of Aspheric Lenses<\/strong><\/p>\n

Aspherical surfaces are classified into two categories: axi-symmetric aspherical surfaces, which have axial symmetry (rotational symmetry) with respect to the lens optical axis, and aspherical surfaces, which do not have axial symmetry. Each type of aspheric surface has its own characteristics.<\/p>\n

Aberration reduction<\/strong><\/p>\n

Axi-symmetric aspheres include rotational parabolas, rotational hyperbolic surfaces, rotational elliptic surfaces, and rotational quadric surfaces. In imaging optics, the use of such axisymmetric aspheres increases the degree of freedom in shape and makes it possible to suppress aberrations that would be difficult with spherical lenses alone.<\/p>\n

In addition, when axi-symmetric aspheres are used in illumination and focusing optics, it is possible to achieve uniform illumination distribution and increase the degree of freedom in ray control.<\/p>\n

Addition of new functions<\/strong><\/p>\n

Aspheres that are not axi-symmetrical (rotationally symmetrical) can be used to change the magnification of vertical and horizontal images in imaging optics. Also, in illumination and focusing optics, light emitted from a point light source can be projected in the form of a line. In this way, aspheres that are not axisymmetric (rotationally symmetric) can achieve new functions that cannot be achieved with spherical lenses alone.<\/p>\n

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Advantages of aspheric lens<\/strong><\/h4>\n

In this section, we will introduce the advantages and disadvantages of axi-symmetric (rotationally symmetric) aspheres in imaging optics. There are three major advantages.<\/p>\n

Number of lenses can be reduced<\/strong><\/p>\n

In imaging optics, multiple spherical lenses are used in combination to reduce aberrations such as image blur and distortion. By using aspherical lenses, it is possible to reduce the number of lenses while maintaining the same performance. For example, you can achieve the same performance of an 5-spherical-lens optical system with a total of 4 lenses using 2 spherical lenses and 2 aspherical lenses.<\/p>\n

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Lens units can be made smaller and lighter<\/strong><\/p>\n

The fewer the number of lenses, the more compact and lighter the optical unit can be.<\/p>\n

Cost reduction for optical products<\/strong><\/p>\n

With fewer lenses, it is possible to reduce lens materials, processing costs, and assembly man-hours, leading to overall cost reductions.<\/p>\n

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Disadvantages of aspheric lenses<\/strong><\/h4>\n

On the other hand, aspheric lenses have their own disadvantages, too.<\/p>\n

Expensive if produced in small quantities<\/strong><\/p>\n

A spherical glass lens is processed by grinding one surface at a time, but grinding and polishing an aspherical lens one surface at a time would be very expensive. For this reason, aspheric shapes are generally processed into molds, which are then transferred and molded onto glass or plastic.<\/p>\n

Although the time required for transfer and molding is shorter than for the spherical polishing process, manufacturing of precision aspheric molds (which incurs cost) in advance are necessary. For this reason, consideration of whether or not to use aspheric lens prior to production, based on the estimated total cost of the production volume is necessary.<\/p>\n

High processing difficulty<\/strong><\/p>\n

Spherical surfaces are characterized by the fact that the radius of curvature is the same at all positions on the sphere, and this leads to the fact that they are easy to polish and high precision can be obtained. On the other hand, aspheric lenses require the radius of curvature to be made different depending on the position, which requires precision mold processing and technology to precisely transfer and mold the aspheric shape.<\/p>\n

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Manufacturing of Aspheric Lenses<\/b><\/h4>\n

The method of manufacturing aspherical lenses by transferring and molding the aspherical shape of the mold onto the lens requires three technologies: ultra-precision mold processing technology, ultra-precision transfer and molding technology, and precision measurement and evaluation technology for these surface shapes.<\/p>\n

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At Optical Design Technology Navigator, we use state-of -the-art ultra-precision processing machines to process aspheric surfaces on a sub-micron order, transfer these aspheric surfaces using molding technology that incorporates a high level of know-how, and then transfer these aspheric surfaces into an ultra-precision 3D mold.<\/p>\n

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Optical Design Technology Navigator will solve all your needs for aspherical lens manufacture!<\/strong><\/h4>\n

TOYOTEC, operator of the Optical Design Technology Navigator, is an all-around optical manufacturer with proficiency in optical, mechanical, and electronical technology. We can design and develop products from scratch based on our customers’ needs, and provides integrated support from design to productization. In addition to manufacturing aspheric lenses, we offer one-stop manufacturing services from ultra-precision machining of lens cores to the design and assembly of lens units, including systems and peripheral components.<\/p>\n

If you are thinking about something like,
\n“If only there was a product like this…”, or, “Is it possible to do these kind of things with lenses?”, Optical Design Technology Navigator, a website operated by a group of optical design professionals, is the place to go. If you have any questions about optical design, please feel free to contact us at Optical Design Technology Navigator.<\/p>","protected":false},"featured_media":2658,"parent":0,"template":"","technicaltypes":[],"columns":[],"category_columns":[34],"acf":[],"yoast_head":"\nAspherical Lens - Features & Benefits | Toyoyec Solutions<\/title>\n<meta name=\"description\" content=\"An aspherical lens is a lens whose lens surface is not spherical. 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