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Objective lens of endoscope

A technology of endoscope and objective lens, which is applied in the field of endoscope objective lens, can solve the problems of unsatisfactory requirements, too long total length, increased length, etc.

Active Publication Date: 2010-01-20
SHANGHAI AOHUA PHOTOELECTRICITY ENDOSCOPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In the upper gastrointestinal electronic endoscope objective lens disclosed in the above invention patent, an infrared light filter is arranged in the endoscope objective lens, but the total length of the endoscope objective lens is too long. Further, as Figure 4 As shown, the infrared filter is located between the lens group and the CCD protective glass, and the imaging correction space is between the lens group and the CCD protective glass. Therefore, under the condition of leaving enough imaging correction distance, the endoscopic The total length of the mirror and objective lens will increase; moreover, in order to ensure that the positive lens part L4 has a sufficient length to the CCD imaging surface, it is necessary to insert a concave-convex positive lens part L3 that meets certain conditions, such as Figure 4 As shown, the concave-convex positive lens component L3 must be very long, further increasing the length of the entire system
[0013] Therefore, none of the existing endoscopic objective lenses can satisfy the needs

Method used

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  • Objective lens of endoscope
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  • Objective lens of endoscope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Such as Figure 5 As shown, in this embodiment, the parameter data of the endoscope objective lens is shown in the following table:

[0049] Table 1 Lens data list of endoscope objective lens of embodiment 1 of the present invention

[0050] Table 1.

[0051] f=1

[0052] F NO = 6

[0053] 1H=0.95

[0054] 2ω=120°

[0055] r1=∞ d1=0.25 nd1=1.85, vd1=25

[0056] r2 = 0.5 d2 = 0.65

[0057] r3=2.5 d3=0.5 nd1=1.65, vd1=555.9

[0058] r4=-0.9 d4=0.2

[0059] r5=∞(stop) d5=0.5 nd1=1.52, vd1=64.1

[0060] r6=∞ d6=0.3

[0061] r7=3.96 d7=0.6 nd1=1.52, vd1=64.1

[0062] r8=-0.8 d8=0.3 nd1=1.92, vd1=20.9

[0063] r9=-1.6 d9=1

[0064] r10=∞ d10=1 nd1=1.52, vd1=64.1

[0065] r11=∞

[0066] In Table 1, r represents the radius of curvature of each lens surface of the lens group, in mm; d represents the distance between each lens surface of the lens group on the optical axis, in mm; nd represents the endoscope objective lens relative to the object side The refractive index of d light (wavelength is 587...

Embodiment 2

[0070] Such as Image 6 As shown, in this embodiment, the parameter data of the endoscope objective lens is shown in the following table:

[0071] Table 2 Lens data list of endoscope objective lens of embodiment 2 of the present invention

[0072] Table 2.

[0073] f=1

[0074] F NO =5.6

[0075] 1H=1.08

[0076] 2ω=140°

[0077] r1=∞ d1=0.809464 nd1=1.85, vd1=25

[0078] r2 = 0.3736587 d2 = 0.2107098

[0079] r3 = 1.347762 d3 = 0.7231893 nd1 = 1.66, vd1 = 51.2

[0080] r4 = -0.6163903 d4 = 0.04478006

[0081] r5=∞(stop) d5=0.7 nd1=1.52, vd1=64.1

[0082] r6=∞ d6=0.175

[0083] r7=1.347762 d7=0.7231893 nd1=1.85, vd1=23.8

[0084] r8 = 0.9327373 d8 = 1.404528 nd1 = 1.59, vd1 = 68.4

[0085] r9=-1.640173 d9=0.5970111

[0086] r10=∞ d10=0.702366 nd1=1.52, vd1=64.1

[0087] r11=∞

[0088] In Table 2, r represents the radius of curvature of each lens surface of the lens group, in mm; d represents the distance between each lens surface of the lens group on the optical axis, in mm; nd represents the endo...

Embodiment 3

[0092] Such as Figure 7 As shown, in this embodiment, the parameter data of the endoscope objective lens is shown in the following table:

[0093] Table 3 The lens data list of the endoscope objective lens of the implementation example 3 of the present invention

[0094] table 3.

[0095] F=1

[0096] F NO =5.4

[0097] 1H=0.9

[0098] 2ω=120°

[0099] r1=∞ d1=0.2517174 nd1=1.88, vd1=41

[0100] r2=0.3335256 d2=0.08927863

[0101] r3 = 0.5089504 d3 = 1.044953 nd1 = 1.52, vd1 = 59.5

[0102] r4=-0.4794767 d4=0.02270298

[0103] r5=∞(stop) d5=0.6292936 nd1=1.52, vd1=64.1

[0104] r6=∞ d6=0.6292936

[0105] r7 = 3.11197 d7 = 0.7111438 nd1 = 1.62, vd1 = 60.3

[0106] r8=-1.072122 d8=0.3146468 nd1=1.92, vd1=21

[0107] r9=-1.873148 d9=1.154781

[0108] r10=∞ d10=0.4405055 nd1=1.52, vd1=64.1

[0109] r11=∞

[0110] In the above table 3, r represents the radius of curvature of each lens surface of the lens group, in mm; d represents the distance between each lens surface of the lens group on the optical...

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Abstract

The invention provides an objective lens of an endoscope, which comprises a front lens system and a back lens system; an aperture diaphragm is arranged between the front lens system and the back lens system; and the ratio of the focal distance of the front lens system to the focal distance of the back lens system is between 0.1 and 2.0. Compared with the prior objective lens of the endoscope, the objective lens of the endoscope effectively controls a distance from an object near plane to the aperture diaphragm and a distance from the aperture diaphragm to an imaging plane through the focal distance ratio of the front and back lens systems; a second lens system in the front lens system can correct most of coma and ratio chromatism generated by a first lens system, and a third lens system in the back lens system can further correct the coma and the ratio chromatism generated by the first lens system; simultaneously, an infrared light filter is arranged between the aperture diaphragm and the third lens system; therefore, the objective lens of the endoscope has the characteristics of short total length, good color restoration, big angle of view, small external diameter and the like to achieve the aim of the invention.

Description

Technical field [0001] The invention relates to an endoscope objective lens, in particular to an electronic inner lens which is suitable for micro-miniature image sensor imaging, has a large field of view, a total length, a small outer diameter, good color reproduction, and good correction of various aberrations. Speculum objective lens. Background technique [0002] Existing electronic endoscopes usually use micro-miniature image sensors such as CCD as the imaging element. Compared with fiber endoscopes, the advantages of high-resolution and high-definition images are undoubtedly displayed; CCD has been widely used and rapidly developed, and corresponding requirements are put forward for electronic endoscope objectives that match CCD, that is, electronic endoscope objectives must have high resolution and good ability to correct various phase differences. [0003] Electronic endoscopes, especially medical flexible electronic endoscopes, in order for doctors to minimize the harm to...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B9/04A61B1/00
Inventor 顾康蒋尊兴顾小舟
Owner SHANGHAI AOHUA PHOTOELECTRICITY ENDOSCOPE
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