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Medical endoscope ultra-wide field type pick-up lens

An ultra-wide-angle and endoscopic technology, which is applied in optics, instruments, surgery, etc., can solve the problems of difficult to take into account optical performance such as depth of field and resolution, large lens components, and large external dimensions, etc., to achieve low cost, The effect of high resolution and large field of view

Inactive Publication Date: 2012-11-07
凤凰光学(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the medical endoscope camera system produced in China has the disadvantage of small field of view. The field of view is generally within 100°, and most of them adopt spherical lens design. Taking into account the shortcomings of optical performance requirements such as depth of field and resolution
Although the field of view of medical endoscopes produced abroad can reach 120°, and the aspheric lens design is adopted, the number of lenses is mostly more than three, and the lens components are large in size and relatively high in cost.

Method used

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  • Medical endoscope ultra-wide field type pick-up lens

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Embodiment one of the present invention satisfies the conditions of table 1 and table 2:

[0040] Table 1

[0041]

[0042] Table 2

[0043]

[0044] In this embodiment, the on-axis point spherical aberration chromatic aberration, field curvature and distortion, defocus optical transfer function and full-frequency optical transfer function curves are as follows Figure 3 to Figure 6 It can be seen from the figure that the above-mentioned aberrations, field curvature, chromatic aberration and full-frequency optical transfer function (MTF) can be well corrected.

Embodiment 2

[0046] Embodiment 2 satisfies the conditions of Table 3 and Table 4, wherein the material used for the first lens 10 and the second lens 30 is also Zeonex E48R.

[0047] table 3

[0048]

[0049] Table 4

[0050]

[0051] In the second embodiment, the on-axis point spherical aberration chromatic aberration, field curvature and distortion, defocus optical transfer function and full-frequency optical transfer function curves are as follows Figure 7 to Figure 10 It can be seen from the figure that the above-mentioned aberrations, field curvature, chromatic aberration and full-frequency optical transfer function (MTF) have all been well corrected.

Embodiment 3

[0053] The third embodiment satisfies the conditions in Table 5 and Table 6, and the material used for the first lens 10 and the third lens 30 is Zeonex 480R.

[0054] table 5

[0055]

[0056] table 6

[0057]

[0058] In the third embodiment, the on-axis point spherical aberration chromatic aberration, field curvature and distortion, defocus optical transfer function and full-frequency optical transfer function curves are as follows Figure 3 to Figure 6 It can be seen from the figure that its aberration, field curvature, chromatic aberration and full-frequency optical transfer function (MTF) can be well corrected.

[0059] Table 7 lists the optical characteristics corresponding to the above three embodiments, including focal length, aperture, field angle, and values ​​corresponding to the above conditional formulas (1) to (6). Wherein, the first lens 10 and the second lens 30 in the three embodiments are all made of Zeonex (brand E48R or 480R), an amorphous polyolefin...

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Abstract

The invention discloses a medical endoscope ultra-wide field type pick-up lens, which sequentially comprises a first lens stop and a second lens from an object side to an image side, wherein two faces of the first lens stop bulge toward the object side, focal power of the first lens stop is negative, and the first lens stop is in a crescent shape; two faces of the second lens bulge, and focal power of the second lens stop is positive; the first lens stop and the second lens meet the following conditions: (1)4<T / f<6, wherein T is the distance from a surface peak of a first lens near the object space to an imaging face; and f is focal length of the medical endoscope ultra-wide field type pick-up lens. The medical endoscope ultra-wide field type pick-up lens provided by the invention has the advantages of great field angle, miniaturization, low cost and high resolution, can obtain good imaging quality under the field angle at about 120 degrees, has nearest imaging distance at 2.8mm and meets requirements of great field angle, miniaturization and high resolution of the medical endoscope. In addition, both the first lens and the second lens are made of the sameplastic, so that the manufacturing process is simplified, the cost is reduced, and thus the medical endoscope ultra-wide field type pick-up lens is suitable for mass production.

Description

technical field [0001] The invention relates to the technical field of medical equipment, in particular to an ultra-wide-angle miniature camera lens for a medical endoscope. Background technique [0002] In the past two hundred years, the medical endoscope camera system has gone through the rigid endoscope stage, the semi-flex endoscope stage and the electronic endoscope era. At present, the medical endoscope camera system produced in China has the disadvantage of a small field of view. The field of view is generally within 100°, and most of them use spherical lens design. Not only the number of lenses is large, the size is large, but also difficult Take into account the shortcomings of optical performance requirements such as depth of field and resolution. Although the field of view of medical endoscopes produced abroad can reach 120°, and the aspheric lens design is adopted, the number of lenses is mostly more than three, and the lens components are large in size and rela...

Claims

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Application Information

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IPC IPC(8): G02B13/06G02B13/18G02B13/00G02B1/04A61B1/00
Inventor 侯晓萍
Owner 凤凰光学(上海)有限公司
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