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Endoscope objective lens

An endoscope and objective lens technology, applied to the field of endoscope objective lens, can solve the problems of difficulty in processing glass aspheric surfaces, high production cost, the overall mirror body cannot meet the functional requirements, and it is difficult to take into account the requirements of fine diameter, etc. Manufacturing tolerance requirements, accurate correction, and the effect of improving image quality

Pending Publication Date: 2019-01-22
INNERMEDICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the processing difficulty and production cost of glass aspheric surfaces are very high
However, for some designs that do not use aspheric surfaces, it is difficult to meet the requirements of small diameter, resulting in the overall mirror body not meeting the functional requirements or the size is too large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] like figure 1 Shown, a kind of endoscopic objective lens, it comprises the first lens 1~the fifth lens 5 and filter plate 6 that are arranged in sequence, described first lens 1 is negative lens, second lens 2 is positive lens, the third lens 3 is a positive lens, the fourth lens 4 is a positive lens, and the fifth lens 5 is a negative lens; the fourth lens 4 and the fifth lens 5 form a cemented lens with negative refractive power; the second lens 2, the third lens 3 , the fourth lens 4, and the fifth lens 5 form an optical group with positive refractive power. The filter 6 is located outside the fifth lens 5 . The first lens 1 is a plano-concave negative lens with a plane facing the object side. The second lens 2 is a concave-convex thick meniscus positive lens, and the concave surfaces are all facing the object side. The third lens 3 is a biconvex positive lens, and the side with the larger absolute value of the radius of curvature faces the object side. The fourt...

Embodiment 2

[0042] like Figure 5 As shown, on the basis of Embodiment 1, the difference of this embodiment is that the parameters of each component of the endoscope objective lens are different, and the parameters are shown in Table 2. The system parameters tested are: F: 0.9938472, FNO.: 6, viewing angle FOV: 140°, image height: 0.943mm.

[0043] Table 2

[0044]

[0045]

[0046] The distortion figure of the optical system adopting the endoscope objective lens of the present embodiment is as follows Image 6 As shown, the chromatic aberration diagram of magnification is shown as Figure 7 As shown, the MTF curve is shown as Figure 8 shown.

Embodiment 3

[0048] like Figure 9 As shown, on the basis of Embodiment 1, the difference of this embodiment is that the parameters of each component of the endoscope objective lens are different, and the parameters are shown in Table 3. The system parameters tested are: F: 0.9916756, FNO.: 6, viewing angle FOV: 150°, image height: 0.9586mm. The distortion figure of the optical system adopting the endoscope objective lens of the present embodiment is as follows Figure 10 As shown, the chromatic aberration diagram of magnification is shown as Figure 11 As shown, the MTF curve is shown as Figure 12 shown.

[0049] table 3

[0050]

[0051] From the data of Examples 1 to 3, it can be seen that the endoscope objective lens of the present invention has the effect of high definition and small diameter, and can meet the requirements of large field of view and large depth of field of the objective lens.

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Abstract

The invention provides an endoscope objective lens, which comprises a first lens to a fifth lens arranged in turn. The first lens is a negative lens, the second lens is a positive lens, the third lensis a positive lens, the fourth lens is a positive lens, and the fifth lens is a negative lens; the fourth lens and the fifth lens constitute a bonding lens with a negative refractive force; and the second lens, the third lens, the fourth lens and the fifth lens form a group of light with a positive refractive force. The technical scheme of the invention has the effects of high definition and finediameter, meets the requirements of large field angle and large field depth of the objective lens, and can better correct the chromatic aberration of on-axis and magnification, improve the image edgequality, and reduce the manufacturing tolerance requirement of the objective lens, and the endoscope objective lens is a spherical endoscope objective lens capable of meeting the requirements of large field depth of 3-100 mm.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to an endoscope objective lens. Background technique [0002] In the process of electronic endoscopic surgery, the acquisition of high-definition images can provide a crucial basis for doctors to judge the condition, and the thinner endoscopic insertion part can effectively relieve the patient's pain, improve the success rate of the operation, and reduce the Accidental abrasion of mucous membranes in the patient's body by the insertion part. In order to achieve high-definition and fine-diameter purposes, image acquisition chips use chips with smaller and smaller package sizes and larger overall pixel counts. The effect it brings is the reduction of the pixel size, so the requirements for the endoscope objective lens are high resolution, large aperture, small size, and large depth of field. These requirements are inherently contradictory and cannot be accommodated at th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B1/00G02B23/24
CPCA61B1/00163G02B23/243
Inventor 白晓淞
Owner INNERMEDICAL CO LTD
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