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Wide open wide-angle lens

A wide-angle, lens technology, used in optical components, optics, instruments, etc., can solve problems such as unsuitable lenses

Inactive Publication Date: 2013-05-08
JOS SCHNEIDER OPTISCHE WERKE AKTIENGESELLSCHAFT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the described lens is not suitable for use as an interchangeable lens for hybrid cameras

Method used

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  • Wide open wide-angle lens
  • Wide open wide-angle lens
  • Wide open wide-angle lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0077] The focal length is 16mm

[0078] The f-number is k=2.8

Embodiment approach 2

[0080] The focal length is 16mm

[0081] The f number is k=2.2

Embodiment approach 3

[0083] The focal length is 12mm

[0084] The f-number is k=2.4

[0085] The exact specifications relating to the various faces of the optical elements of the three exemplary embodiments can be found in Tables 1 to 3, together with the respective reference numerals associated therewith.

[0086] Lists of radii, thicknesses or air gaps, refractive indices, and Abbe numbers for three exemplary embodiments can be found in Table 1, Table 2, and Table 3.

[0087] The aspheric data for the lens element faces of the aspheric implementations presented as three wide angle lenses of the exemplary embodiment are listed in Table 1A, Table 2A, and Table 3A.

[0088] The face of an aspheric lens element can generally be described by the following formula:

[0089] z = cr 2 1 + 1 - ( 1 ...

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PUM

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Abstract

A high-aperture wide-angle lens for digital image acquisition, comprising five lens elements, as viewed from the object side, i.e. from the left, a first, negative meniscus lens element, a second, positive lens element, a third, positive lens element, a fourth, negative lens element and a fifth, positive meniscus lens element. A diaphragm is arranged between the second lens element and the third lens element. At least three surfaces upstream of the diaphragm and three surfaces downstream of the diaphragm are embodied as aspherical surface. However, further surfaces can also have an aspherical design. On account of its extremely compact design and its outstanding optical properties, the proposed high-aperture wide-angle lens is suitable as an interchangeable lens for so-called "hybrid cameras".

Description

technical field [0001] The present invention relates to high aperture wide angle lenses for digital image acquisition for photographic and industrial applications. Background technique [0002] In addition to digital reflex cameras, there is increasing interest in digital cameras with roughly comparable characteristics to mirrorless, in terms of image quality and accessories, especially in terms of the possibility of being able to use interchangeable lenses for specific tasks. [0003] The omission of the mirror primarily gives a size advantage over the system's reflective camera. The model size of mirrorless cameras has approached that of small and compact cameras. [0004] Digital cameras with interchangeable lenses and no mirrors are often referred to as "hybrid cameras". There is also a need for interchangeable lenses with a design as compact as possible, especially in order to enable various specific uses of such cameras. [0005] A wide-angle lens for digital image ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B9/60G02B13/00G02B13/06
CPCG02B13/04G02B13/06G02B9/60G02B13/18G02B13/00
Inventor H·艾伯斯梅尔T·施泰尼希
Owner JOS SCHNEIDER OPTISCHE WERKE AKTIENGESELLSCHAFT