CN214278536U - Wide-angle miniature endoscope optical imaging system - Google Patents
Wide-angle miniature endoscope optical imaging system Download PDFInfo
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- CN214278536U CN214278536U CN202120172601.6U CN202120172601U CN214278536U CN 214278536 U CN214278536 U CN 214278536U CN 202120172601 U CN202120172601 U CN 202120172601U CN 214278536 U CN214278536 U CN 214278536U
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 32
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 238000003384 imaging method Methods 0.000 abstract description 6
- 230000004075 alteration Effects 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 206010002091 Anaesthesia Diseases 0.000 description 4
- 230000036407 pain Effects 0.000 description 3
- 230000036285 pathological change Effects 0.000 description 3
- 231100000915 pathological change Toxicity 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 208000002495 Uterine Neoplasms Diseases 0.000 description 2
- 230000037005 anaesthesia Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 206010046766 uterine cancer Diseases 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 206010028980 Neoplasm Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001574 biopsy Methods 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000013399 early diagnosis Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011369 optimal treatment Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Abstract
The utility model discloses a miniature endoscope optical imaging system of wide angle has in proper order from the object space to the image space along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; the object plane side of the first lens is a plane, and the image plane side of the first lens is a concave surface; the object surface side of the second lens is a convex surface, and the image surface side of the second lens is a convex surface; the object plane side of the third lens is a plane, and the image plane side of the third lens is a convex surface; the object plane side of the fourth lens is a concave surface, and the image plane side of the fourth lens is a concave surface; the object plane side of the fifth lens is a convex surface, and the image plane side of the fifth lens is a plane; the object side of the sixth lens is a convex surface, the image side is a plane, the wide-angle miniature endoscope optical imaging system of the invention has clear imaging, spherical aberration, chromatic dispersion, field curvature, distortion and the like are corrected by reasonably matching the first lens to the sixth lens and utilizing the characteristics of each lens, so that the field angle of the lens reaches 50 degrees, the lens forms an image on 1/4-inch CCD of the image surface, and a large-range picture can be observed.
Description
Technical Field
The utility model relates to an optical imaging system, especially a miniature endoscope optical imaging system of wide angle.
Background
With the development of science and technology, the medical industry has changed greatly, the endoscope is a very common medical tool at present in clinic, it is made up of light source, flexible part and lens, connect with the photoelectric sensor CCD or CMOS behind the endoscope; the doctor can directly guide the endoscope to the position to be checked, real-time dynamic imaging is carried out on the pathological change condition through the lens, the doctor can visually judge the pathological change condition through the image, an optimal treatment scheme is worked out according to the pathological change condition, and the doctor can also carry out accurate operation in the visual state; for the lens, the influence of factors such as a visual distance, a field angle, resolution and the like is mainly used, and with the development of the wide-angle lens and the appearance of a high-pixel chip, the ultra-large wide-angle lens can be applied to the endoscope, so that the condition of a patient can be better observed; an important field of electronic endoscopes is diagnosis of uterine cancer, the main diagnostic means at present are ultrasonic waves and electronic hysteroscopes, and due to the defects of indirect images and low resolution of ultrasonic technology, the electronic endoscopes are more and more applied to fixed-point biopsy of the uterine cancer, and if the outer diameter of the electronic endoscope is larger than the limit of 8mm free from anesthesia, anesthesia is required when the electronic endoscope is used for uterine cavity examination, so that the electronic endoscope is not suitable for early diagnosis of the cancer; the invention aims to provide a wide-angle medical endoscope imaging system which is beneficial to diagnosis and treatment in a small space and causes less pain to patients in the process of examination or treatment by using an electronic endoscope.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model provides a miniature endoscope optical imaging system of wide angle is favorable to diagnosing of little space, need not rotate the camera lens and carry out observation shooting on a large scale in narrow and small space, has improved work efficiency and has reduced size space.
The utility model provides a technical scheme that its technical problem adopted is:
the wide-angle miniature endoscope optical imaging system comprises six coaxial spherical refractors, which are sequentially arranged from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; the object plane side of the first lens is a plane, and the image plane side of the first lens is a concave surface; the object side of the second lens is a convex surface, and the image side of the second lens is a convex surface; the object plane side of the third lens is a plane, and the image plane side of the third lens is a convex surface; the object plane side of the fourth lens is a concave surface, and the image plane side of the fourth lens is a concave surface; the object plane side of the fifth lens is a convex surface, and the image plane side of the fifth lens is a plane; the object plane side of the sixth lens is a convex surface, and the image plane side is a plane.
The curvature radius of the object plane of the first lens is R1 and ranges from-100 mm < R1< -120mm, the curvature radius of the image plane of the first lens is R2 and ranges from 0.8mm < R2<1.2 mm; the curvature radius of the object plane of the second lens is R3 and ranges from 5mm < R3<6mm, the curvature radius of the image plane of the second lens is R4 and ranges from-2.5 mm < R4< -3.5 mm; the curvature radius of an object plane of the third lens is R5 and ranges from 20mm < R5<25mm, the curvature radius of an image plane of the third lens is R6 and ranges from-2 mm < R6< -3 mm; the curvature radius of the object plane of the fourth lens is R7, the range of the curvature radius is-3.8 mm < R7< -4.6mm, the curvature radius of the image plane is R8, the range of the curvature radius is 3.0mm < R8<3.4 mm; the curvature radius of the object plane of the fifth lens is R9 and ranges from 4.1mm < R9<4.5mm, the curvature radius of the image plane of the fifth lens is R10 and ranges from-53.0 mm < R10< -56.5 mm; the curvature radius of the object plane of the sixth lens is R11, the range of the curvature radius is 1.7mm < R11<2.1mm, the curvature radius of the image plane is R12, and the range of the curvature radius is-11 mm < R12< -13 mm.
The focal power on the first lens is negative; the focal power on the second lens is positive; the focal power on the third lens is positive; the focal power of the fourth lens is negative; the focal power of the fifth lens is positive; the focal power on the sixth lens is positive
The focal length range of the first lens is-2 mm < f1< -2.1 mm; the focal length range of the second lens is 3.5mm < f2<3.6 mm; the focal length range of the third lens is 4.6mm < f3<4.7 mm; the focal length range of the fourth lens is-2.2 mm or more f4< -2.3 mm; the focal length range of the fifth lens is 4.5mm < f5<4.6 mm; the sixth lens has a focal length in a range of 3.5mm < f6<3.6 mm.
The optical imaging system further satisfies the following condition: 1.50< Nd1<1.55;62< Vd1< 66; 1.60< Nd2<1.65;41< Vd2< 45; 1.50< Nd3<1.55;62< Vd3< 66; 1.76< Nd4<1.80;24< Vd4< 28; 1.86< Nd5<1.90;38< Vd5< 42; 1.47< Nd6<1.51;82< Vd6< 86; wherein Nd1 is the refractive index of the first lens, and Vd1 is the abbe number of the first lens; nd2 is the refractive index of the second lens, and Vd2 is the Abbe number of the second lens; nd3 is the refractive index of the third lens, and Vd3 is the abbe number of the third lens; nd4 is the refractive index of the fourth lens, and Vd4 is the abbe number of the fourth lens; nd5 is the refractive index of the fifth lens, and Vd5 is the abbe number of the fifth lens; nd6 is a refractive index of the sixth lens, and Vd6 is an abbe number of the sixth lens.
The total optical length TTL of the optical imaging system is 9.0mm < TTL <10.0 mm.
The optical imaging system has an aperture F-number of 5.0< F < 5.2.
The utility model has the advantages that: the external diameter size of the optical system structure is controlled within 8mm, the external diameter requirement of an anesthesia-free uterine cavity examination instrument is met, and the structure is made to be tiny as much as possible on the premise of ensuring the imaging quality, so that the pain of a patient caused by the application of the optical system structure in the uterine cavity examination is reduced.
Drawings
The present invention will be further explained with reference to the drawings and examples.
FIG. 1 is an optical path diagram of a wide-angle miniature endoscope optical imaging system of the present invention;
FIG. 2 is a diagram of the optical transfer function of the wide angle miniature endoscopic optical imaging system of the present invention;
FIG. 3 is a dot-column diagram of the wide-angle miniature endoscope optical imaging system of the present invention;
FIG. 4 is an aberration analysis diagram of the wide angle miniature endoscope optical imaging system of the present invention.
Detailed Description
Referring to fig. 1 to 4, a wide-angle miniature endoscope optical imaging system comprises six coaxial spherical refractors, which are sequentially arranged from an object side to an image side along an optical axis: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a sixth lens 6; the object plane side of the first lens 1 is a plane, and the image plane side is a concave surface; the object surface side of the second lens 2 is a convex surface, and the image surface side is a convex surface; the object plane side of the third lens 3 is a plane, and the image plane side is a convex surface; the object surface side of the fourth lens 4 is a concave surface, and the image surface side is a concave surface; the object plane side of the fifth lens 5 is a convex surface, and the image plane side is a plane; the object plane side of the sixth lens element 6 is a convex surface, and the image plane side is a flat surface.
The curvature radius of an object plane of the first lens 1 is R1, the range of the curvature radius is-100 mm < R1< -120mm, the curvature radius of an image plane is R2, the range of the curvature radius is 0.8mm < R2<1.2 mm; the curvature radius of the object plane of the second lens 2 is R3, the range of the curvature radius is 5mm < R3<6mm, the curvature radius of the image plane is R4, the range of the curvature radius is-2.5 mm < R4< -3.5 mm; the curvature radius of an object plane of the third lens 3 is R5, the range of the curvature radius is 20mm < R5<25mm, the curvature radius of an image plane is R6, and the range of the curvature radius is-2 mm < R6< -3 mm; the curvature radius of an object plane of the fourth lens 4 is R7, the range of the curvature radius is-3.8 mm < R7< -4.6mm, the curvature radius of an image plane is R8, the range of the curvature radius is 3.0mm < R8<3.4 mm; the curvature radius of an object plane of the fifth lens 5 is R9 and ranges from 4.1mm < R9<4.5mm, the curvature radius of an image plane of the fifth lens 5 is R10 and ranges from-53.0 mm < R10< -56.5 mm; the curvature radius of the object plane of the sixth lens 6 is R11, the range of the curvature radius is 1.7mm < R11<2.1mm, the curvature radius of the image plane is R12, and the range of the curvature radius is-11 mm < R12< -13 mm.
The focal power of the first lens 1 is negative; the focal power on the second lens 2 is positive; the focal power on the third lens 3 is positive; the focal power of the fourth lens 4 is negative; the focal power of the fifth lens 5 is positive; the focal power of the sixth lens 6 is positive
In the present embodiment, the focal length of the first lens 1 is in the range of-2 mm < f1< -2.1mm, and the preferred focal length is-2.057 mm; the focal length range of the second lens 2 is 3.5mm < f2<3.6mm, and the preferred focal length is 3.505 mm; the focal length range of the third lens 3 is 4.6mm < f3<4.7mm, and the preferred focal length is 4.691 mm; the focal length range of the fourth lens 4 is-2.2 mm ≤ f4< -2.3mm, and the preferred focal length is-2.216 mm; the focal length range of the fifth lens 5 is 4.5mm < f5<4.6mm, and the preferred focal length is 4.532 mm; the focal length of the sixth lens 6 ranges from 3.5mm < f6<3.6mm, preferably the focal length is 3.508 mm.
The optical imaging system further satisfies the following condition:
(1)1.50<Nd1<1.55；62<Vd1<66；
(2)1.60<Nd2<1.65；41<Vd2<45；
(3)1.50<Nd3<1.55；62<Vd3<66；
(4)1.76<Nd4<1.80；24<Vd4<28；
(5)1.86<Nd5<1.90；38<Vd5<42；
(6)1.47<Nd6<1.51；82<Vd6<86；
wherein Nd1 is the refractive index of the first lens 1, and Vd1 is the abbe number of the first lens 1; nd2 is the refractive index of the second lens 2, and Vd2 is the abbe number of the second lens 2; nd3 is the refractive index of the third lens 3, and Vd3 is the abbe number of the third lens 3; nd4 is the refractive index of the fourth lens 4, and Vd4 is the abbe number of the fourth lens 4; nd5 is the refractive index of the fifth lens 5, and Vd5 is the abbe number of the fifth lens 5; nd6 is the refractive index of the sixth lens 6, and Vd6 is the abbe number of the sixth lens 6.
The total optical length TTL of the optical imaging system is 9.0mm < TTL <10.0 mm.
The optical imaging system has an aperture F-number of 5.0< F < 5.2.
The following table shows specific design data for the wide-angle miniature endoscope optical imaging system of the present invention.
Referring to the optical transfer function diagram of fig. 2, the imaging surface of the wide-angle miniature endoscope optical imaging system is 1/4-inch CCD, the spatial resolution is 78lp/mm, the spatial resolution corresponding to the optical transfer function MTF of 0.2 is the maximum resolution of the optical system, the MTF of the wide-angle miniature endoscope optical imaging system reaches more than 0.5 under the field angle of 50 degrees, the resolution of the CCD 78lp/mm exceeds 1/4 inches, and the requirement of 1/4-inch CCD spatial resolution is met.
Referring to the dot-sequence diagram of fig. 3, the present invention adjusts the parameters of each lens so that the diffuse spot remains within the airy class at a large field angle of 50 °, with an RMS radius of 0.938 and a GEO radius of 2.194.
In conclusion, the external diameter size of the optical system structure is controlled within 8mm, the external diameter requirement of the anesthesia-free uterine cavity examination instrument is met, and the structure is made as small as possible on the premise of ensuring the imaging quality, so that the pain of a patient caused by the application of the optical system structure in the uterine cavity examination is reduced.
The above embodiments do not limit the scope of the present invention, and those skilled in the art can make equivalent modifications and variations without departing from the overall concept of the present invention.
Claims (7)
1. The utility model provides a miniature endoscope optical imaging system of wide angle which characterized in that includes six coaxial spherical refractors, has in proper order along the optical axis from the object space to the image space: a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), and a sixth lens (6); the object plane side of the first lens (1) is a plane, and the image plane side of the first lens is a concave surface; the object plane side of the second lens (2) is a convex surface, and the image plane side of the second lens is a convex surface; the object surface side of the third lens (3) is a plane, and the image surface side is a convex surface; the object surface side of the fourth lens (4) is a concave surface, and the image surface side is a concave surface; the object plane side of the fifth lens (5) is a convex surface, and the image plane side is a plane; the object plane side of the sixth lens (6) is a convex surface, and the image plane side is a plane.
2. The wide-angle microendoscope optical imaging system of claim 1, characterized in that the first lens (1) has a radius of curvature of the object plane R1 in the range-100 mm < R1< -120mm, a radius of curvature of the image plane R2 in the range 0.8mm < R2<1.2 mm; the curvature radius of the object plane of the second lens (2) is R3, the range of the curvature radius is 5mm < R3<6mm, the curvature radius of the image plane is R4, and the range of the curvature radius is-2.5 mm < R4< -3.5 mm; the curvature radius of an object plane of the third lens (3) is R5, the range of the curvature radius is 20mm < R5<25mm, the curvature radius of an image plane is R6, and the range of the curvature radius is-2 mm < R6< -3 mm; the curvature radius of an object plane of the fourth lens (4) is R7, the range of the curvature radius is-3.8 mm < R7< -4.6mm, the curvature radius of an image plane is R8, and the range of the curvature radius is 3.0mm < R8<3.4 mm; the curvature radius of an object plane of the fifth lens (5) is R9 and ranges from 4.1mm < R9<4.5mm, the curvature radius of an image plane of the fifth lens (5) is R10 and ranges from-53.0 mm < R10< -56.5 mm; the curvature radius of the object plane of the sixth lens (6) is R11, the range of the curvature radius is 1.7mm < R11<2.1mm, the curvature radius of the image plane is R12, and the range of the curvature radius is-11 mm < R12< -13 mm.
3. A wide-angle microendoscope optical imaging system as claimed in claim 1, characterized in that the optical power on the first lens (1) is negative; the focal power on the second lens (2) is positive; the focal power on the third lens (3) is positive; the focal power of the fourth lens (4) is negative; the focal power on the fifth lens (5) is positive; the focal power on the sixth lens (6) is positive.
4. A wide-angle microendoscope optical imaging system as claimed in claim 3, characterized in that the focal length of the first lens (1) ranges from-2 mm < f1< -2.1 mm; the focal length range of the second lens (2) is 3.5mm < f2<3.6 mm; the focal length range of the third lens (3) is 4.6mm < f3<4.7 mm; the focal length range of the fourth lens (4) is more than or equal to-2.2 mm and less than or equal to f4< -2.3 mm; the focal length range of the fifth lens (5) is 4.5mm < f5<4.6 mm; the focal length range of the sixth lens (6) is 3.5mm < f6<3.6 mm.
5. The wide-angle miniature endoscopic optical imaging system according to claim 1, wherein said optical imaging system further satisfies the following condition: 1.50< Nd1<1.55;62< Vd1< 66; 1.60< Nd2<1.65;41< Vd2< 45; 1.50< Nd3<1.55;62< Vd3< 66; 1.76< Nd4<1.80;24< Vd4< 28; 1.86< Nd5<1.90;38< Vd5< 42; 1.47< Nd6<1.51;82< Vd6< 86; wherein Nd1 is the refractive index of the first lens (1), and Vd1 is the abbe number of the first lens (1); nd2 is the refractive index of the second lens (2), and Vd2 is the Abbe number of the second lens (2); nd3 is the refractive index of the third lens (3), and Vd3 is the Abbe number of the third lens (3); nd4 is the refractive index of the fourth lens (4), and Vd4 is the abbe number of the fourth lens (4); nd5 is the refractive index of the fifth lens (5), and Vd5 is the abbe number of the fifth lens (5); nd6 is a refractive index of the sixth lens (6), and Vd6 is an Abbe number of the sixth lens (6).
6. The wide-angle miniature endoscopic optical imaging system according to claim 1, wherein said optical imaging system has an overall optical length TTL of 9.0mm < TTL <10.0 mm.
7. A wide angle miniature endoscope optical imaging system as set forth in claim 1, wherein said optical imaging system has an F-number of aperture of 5.0< F < 5.2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120172601.6U CN214278536U (en) | 2021-01-21 | 2021-01-21 | Wide-angle miniature endoscope optical imaging system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120172601.6U CN214278536U (en) | 2021-01-21 | 2021-01-21 | Wide-angle miniature endoscope optical imaging system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112782842A (en) * | 2021-01-21 | 2021-05-11 | 电子科技大学中山学院 | Wide-angle miniature endoscope optical imaging system |
| CN116009221A (en) * | 2023-03-24 | 2023-04-25 | 联创电子科技股份有限公司 | Optical lens and camera module |
| CN117297533A (en) * | 2023-11-29 | 2023-12-29 | 桐庐优视医疗器械有限公司 | Uterine cavity endoscope free of dilatation |
-
2021
- 2021-01-21 CN CN202120172601.6U patent/CN214278536U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112782842A (en) * | 2021-01-21 | 2021-05-11 | 电子科技大学中山学院 | Wide-angle miniature endoscope optical imaging system |
| CN112782842B (en) * | 2021-01-21 | 2024-10-11 | 电子科技大学中山学院 | Wide-angle miniature endoscope optical imaging system |
| CN116009221A (en) * | 2023-03-24 | 2023-04-25 | 联创电子科技股份有限公司 | Optical lens and camera module |
| CN117297533A (en) * | 2023-11-29 | 2023-12-29 | 桐庐优视医疗器械有限公司 | Uterine cavity endoscope free of dilatation |
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