CN114355604B - Disposable hard tube endoscope optical system - Google Patents
Disposable hard tube endoscope optical system Download PDFInfo
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- CN114355604B CN114355604B CN202210074763.5A CN202210074763A CN114355604B CN 114355604 B CN114355604 B CN 114355604B CN 202210074763 A CN202210074763 A CN 202210074763A CN 114355604 B CN114355604 B CN 114355604B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 55
- 238000003384 imaging method Methods 0.000 claims abstract description 50
- 230000004075 alteration Effects 0.000 claims abstract description 30
- 238000012546 transfer Methods 0.000 claims abstract description 22
- 206010010071 Coma Diseases 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 4
- 230000005499 meniscus Effects 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims 2
- 230000001070 adhesive effect Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 12
- 238000012634 optical imaging Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 229910052594 sapphire Inorganic materials 0.000 description 2
- 239000010980 sapphire Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 210000003695 paranasal sinus Anatomy 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Abstract
The invention relates to a disposable hard tube endoscope optical system, which consists of a hard tube endoscope body and a CMOS camera imaging system. Wherein the hard tube endoscope body is formed by 1 with the same optical structure of the objective lens and 3 groups: 1 symmetrical image transfer system, the 3 groups of optical structures are the same 1: the 1 symmetrical image transfer system consists of 6 biconvex thick lenses with the same spherical radius; the CMOS camera imaging system consists of a collimating lens group and an imaging lens group, wherein the collimating lens group has the same optical structure as the 3 groups 1: and 1, imaging a final image of the symmetrical image-transferring system at infinity, and imaging an infinity image of the collimating lens group on a CMOS pixel surface by the imaging lens group, wherein the collimating lens group and the imaging lens group jointly correct spherical aberration, coma aberration, field curvature and other aberrations which cannot be corrected by the hard tube endoscope body, so as to obtain a clear image.
Description
Technical Field
The invention belongs to the technical field of optical design, and particularly relates to a disposable hard tube endoscope body and an optical system design method thereof.
Background
As shown in fig. 1, the conventional hard tube endoscope optical system includes three parts: OBJ is a hard tube endoscope objective lens that images an object upside down; REL is a hard tube endoscope optical imaging system, which re-images an image formed by an objective lens by 1:1, and forms an upright real image at the object focal plane of the eyepiece of the hard tube endoscope after repeated imaging, and the REL has the function of increasing the working length of the hard tube endoscope; OCU is a rigid tube endoscope eyepiece that images an endoscopic image at infinity through which an observer can observe the aforementioned positive real image.
Fig. 2 is a diagram showing the structure of an optical image transfer system of a conventional hard tube endoscope, wherein the structure is composed of a pair of double-cemented thin lens groups with the same structural parameters, a diaphragm is positioned in the middle, and the vertical axis aberration is well corrected. However, due to the adoption of the thin lens group, the light energy transmittance of the system is low, and the lens is easy to incline during assembly, so that the image quality is affected, and no enterprise uses the lens.
The conventional optical image transfer system of the hard tube endoscope shown in fig. 3 has a symmetrical structure, in which one end of a Hopkins rod lens is glued with a thin negative lens with a negative focal length, and the thin negative lens uses high refractive index and high dispersion optical glass for correcting axial chromatic aberration, but cannot correct curvature of field. The optical image transfer system of the hard tube endoscope has the advantages of simple structure and large radius of the non-glued surface of the Hopkins rod-shaped lens, and is difficult to process by the traditional optical processing technology.
The structure of the optical image transfer system of the conventional hard tube endoscope shown in fig. 4 is that the two ends of the Hopkins rod lens are bonded with the lens, the spherical radius of the Hopkins rod lens is small, the processing is simple, but the bonding surface is more, the bonding time is high, and meanwhile, the eccentric of the bonding surface seriously affects the image quality.
In the conventional hard tube endoscope optical image transfer system shown in fig. 5, only two Hopkins rod lenses with symmetrical structures are used, the number of lens sheets is minimum, any aberration cannot be corrected, the spherical radius is large, the processing difficulty is very high, and the system cannot be widely used by enterprises at present.
At present, a hard tube endoscope optical system consists of an ocular lens, a 3 or 5-group image transfer system and an ocular lens group, and has the advantages of duplicate structure, high cost and incapability of being used once.
The technical problems to be solved by the invention are as follows: the number of the lens sheets is minimum, and the traditional lens can be eliminated on the basis of no ocular lens and ocular shade, wherein the traditional lens is formed by the same structure of an objective lens and 3 groups of optics 1:1, aberrations such as spherical aberration, coma aberration, field curvature and the like which cannot be corrected and exist in a hard tube endoscope body optical system formed by the symmetrical image transfer system can be used for a hard tube endoscope optical system at one time.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: correction was made by objective lens and 3 groups of optics identical 1:1 symmetrical image-turning system, so that the cost of the disposable hard tube endoscope main body is the lowest and the structure is the simplest.
The technical scheme of the invention is as follows:
1 where the objective lens has the same optical structure as 3 groups: 1 symmetrical image transfer system can meet the 175mm working length requirement of arthroscope and nasosinusitis, and as the aberration is not corrected and the eyepiece is not available for independent use, the endoscope can be put into normal operation after being matched with a CMOS camera imaging system and computer software which are designed in addition in the invention and the view field direction of the hard tube endoscope is calibrated.
The optical system of the disposable hard tube endoscope comprises 3 groups of optical structures with the same structure as 1: the 1 symmetrical image transfer system consists of 6 biconvex thick lenses with the same spherical radius, and the objective lens and 3 groups of optical structures are the same 1:1 the symmetrical image-turning system forms a hard tube endoscope body, which is suitable for paranasal sinuses, arthroscopes and the like. 1 with the same optical structure from 3 groups: the image transfer system formed by the 1-symmetry image transfer system can only image the image of the objective lens positioned at the front focus of the first group of image transfer system at the rear focus of the last group of image transfer system after passing through the 3 groups of image transfer systems, and at the moment, any aberration cannot be corrected, and the aberration is corrected by the subsequent CMOS camera imaging system. The CMOS camera imaging system consists of a collimating lens group and an imaging lens group, wherein the collimating lens group images an image of the image transfer system at infinity, and meanwhile, aberrations such as spherical aberration, coma aberration, field curvature and the like which cannot be corrected by a hard tube endoscope body optical system formed by an objective lens and a 3-group image transfer system are corrected; the imaging lens group of the CMOS camera imaging system focuses an image which is imaged by the collimating lens group of the CMOS camera imaging system at infinity on the CMOS image surface, and simultaneously further corrects the residual aberration of the optical system in front of the image to obtain an ideal image. In order to calibrate the view field direction of the hard tube endoscope, a method of controlling the image display range by computer software is adopted to limit the view field display range of the hard tube endoscope and provide a direction indicator function.
The beneficial effects of the invention are as follows:
1) The disposable hard tube endoscope optical system has the advantages of less number of lenses, no ocular and eye cover, simple structure and low cost.
2) The CMOS camera imaging system can effectively correct various aberrations of the optical system of the disposable hard tube endoscope body to obtain clear images.
3) The disposable hard tube endoscope body can be used once or repeatedly;
4) The CMOS camera imaging system of the invention replaces the traditional interface lens structure, thereby saving a large number of ocular lenses and eyeshields.
5) The electronic view field diaphragm saves the cost of the mechanical view field diaphragm, and the mechanical part has simpler structure.
Drawings
Fig. 1 is a schematic view of an optical system of a conventional three-stage hard tube endoscope.
Fig. 2 is a schematic diagram of the structure of an optical imaging system of a conventional hard tube endoscope.
Fig. 3 shows a first conventional optical imaging system structure of a hard tube endoscope.
Fig. 4 shows a second conventional optical imaging system structure of a hard tube endoscope.
Fig. 5 shows a third conventional optical imaging system structure of a hard tube endoscope.
Fig. 6a is a general view showing the structure of the disposable hard tube endoscope body of the present invention.
Fig. 6b is a view of the objective lens structure of the 0-degree direct view endoscope of the present invention.
Fig. 6c is a structural diagram of a 30-degree oblique view objective lens of the present invention.
Fig. 6d is a block diagram of a 70 oblique view objective lens of the present invention.
Fig. 6e is a block diagram of a 3-group relay system according to the present invention.
Fig. 7a is an optical block diagram of a CMOS camera imaging system of the present invention.
Fig. 7b is a diagram of the collimating lens group structure of the CMOS camera imaging system of the present invention.
Fig. 7c is a block diagram of an imaging lens group of the CMOS camera imaging system of the present invention.
Fig. 8 is an imaging view of the present invention after processing by computer software.
Detailed Description
As shown in fig. 6a, the disposable hard tube endoscope body is composed of an objective lens and 3 groups of optical structures which are identical 1:1, a symmetrical image rotating system. Wherein 1-1 is a sapphire protection sheet, 1-2 is a plano-concave lens, 1-3 is a diaphragm sheet, 1-5 is a steering prism, 1-5 is a plano-convex lens, and 5 optical parts are glued together according to design requirements to form a first component of an objective lens; 2-1 is a plano-concave lens and 2-2 is a plano-convex lens, which are glued together to form a second objective lens assembly; 3-1, 3-2, 3-3, 3-4, 3-5 and 3-6 are biconvex thick lenses with identical structural parameters, and front and back focuses of the lenses are connected to form 3 groups of 1 with identical optical structures: in the 1-symmetry imaging system, the front focus of the 3-1 coincides with the Image position of the object lens Image plane, and the images of the 3-group imaging system are Image1, image2 and Image3, and the Image3 is positioned at the rear focus of the 3-6 biconvex lens.
FIG. 6b is a 0 direct view endoscope objective lens configuration without prisms 1-4; FIG. 6c is a 30 oblique view objective lens configuration; FIG. 6d is a 70 oblique view objective lens configuration; fig. 6e is a block diagram of a 3-group relay system.
The optical system of the disposable hard tube endoscope main body is designed to have an object distance of 6mm, a field angle of greater than 90 degrees, an intermediate image diameter of 2mm and an exit pupil of infinite distance, and is mainly applicable to arthroscopes, and specific optical parameters are as follows:
the 1-9 rows are structural parameters of the first group objective lens component of the objective lens, namely a sapphire protection sheet 1-1, a plano-concave lens 1-2, a diaphragm sheet 1-3, a prism 1-4 and a plano-convex lens 1-5; rows 10-12 are the structural parameters of the second component of the objective lens consisting of a meniscus lens 2-1 and a biconvex lens 2-2; rows 14-30 are 3 sets of 1's of identical optical structures: 1 structural parameters of symmetrical image transfer system, L 3 ＝25.35、r 3 ＝10.85、f 3 =17.4, satisfy f 3 <L 3 <1.5f 3 ，0.4L 3 <r 3 <0.5d 3 Relationship.
The third-order aberration of the optical system is as follows:
as can be seen from the 3 rd order aberrometer described above, various aberrations are not corrected.
The disposable hard tube endoscope body and the CMOS camera imaging system constitute the whole of the optical system, and the aberration joint correction results thereof are as follows.
Fig. 7a is an optical structure diagram of a CMOS camera imaging system, fig. 7b is a structure diagram of a collimating lens group of the CMOS camera imaging system, and fig. 7c is a structure diagram of an imaging lens group of the CMOS camera imaging system.
The 32-37 rows are the optical structural parameters of the collimation group of the CMOS camera imaging system, and the focal length is f 4 Lines 32-34 are the resulting parameters of the 4-1 and 4-2 glues, their focal lengths f 412 The method comprises the steps of carrying out a first treatment on the surface of the Rows 35-37 are structural parameters of the 4-3 and 4-4 glues, their focal length f 434 The method comprises the steps of carrying out a first treatment on the surface of the Center distance of two sets of glue members l=l 34 = 10.746 spherical radius r of the cemented surface of the lenticular lens 4-4 434 ＝r 36 =2.03. In order to well correct the aberration of the disposable hard tube endoscope body and keep the size of the CMOS camera imaging system small, the CMOS camera imaging system collimates the group opticsThe structural parameters satisfy:
0.9f` 4 <L<1.5f` 4
1.8<r 434 <0.3f` 4
0.5f` 4 <f` 412 <f` 4
25f｀ 4 <f｀ 434 <40f｀ 4
rows 38-44 are CMOS camera imaging system convergence group optical configuration parameters,
its focal length f 5 ，f｀ 4 <f｀ 5 <2.5f｀ 4 。
1 by the same objective lens as 3 groups of optical structures: the aberration of the disposable hard tube endoscope body formed by the 1-symmetry image-turning system is not corrected, and the aberration is well corrected after the CMOS camera imaging system is added, which is clear from the two third-order aberrations. Image3 is imaged at infinity by the CMOS camera imaging system collimator lens group, and Image4 is imaged on the CMOS Image plane by the CMOS camera imaging system collimator lens group.
Fig. 8 shows a single-use hard tube endoscope image with pixels outside the range of 3.2mm in diameter of the CMOS center not shown and with direction marks set in the range of 3.2mm in diameter by computer software. In order to obtain clear optical images, the CMOS camera imaging system imaging lens group may be micro-focused in the optical axis direction.
The CMOS camera imaging system replaces the traditional interface lens structure, saves a large number of ocular lenses and eye shields, can simultaneously correct spherical aberration, chromatic aberration and field curvature of the traditional hard tube endoscope body optical system, saves the cost of a mechanical field diaphragm by adopting an electronic field diaphragm, and has simpler mechanical part structure.
Claims (8)
1. A disposable hard tube endoscope optical system, characterized in that: the endoscope consists of a hard tube endoscope body and a CMOS camera imaging system, wherein the hard tube endoscope body is formed by 1 with the same optical structure of an objective lens and 3 groups: 1, a symmetrical image transfer system, wherein the objective lens consists of a first group of objective lens components and a second group of objective lens components, and the CMOS camera imaging system consists of a collimating lens group and an imaging lens group;
the collimating lens group consists of two groups of double-cemented lenses, and the focal length f' of the collimating lens group 4 The first group of the collimating lens group is formed by bonding a biconvex lens (4-1) and a meniscus lens (4-2) together by ultraviolet photosensitive adhesive, and the focal length f 'of the first group is equal to the focal length f' of the second group 412 The method comprises the steps of carrying out a first treatment on the surface of the The second group of the collimating lens group is formed by bonding a plano-concave lens (4-3) and a biconvex lens (4-4) together by ultraviolet photosensitive adhesive, and the focal length of the second group is equal to that of the first group
Is f 、 434 Spherical radius r of the bonding surface of the plano-concave lens (4-3) and the biconvex lens (4-4) 434 The center distance L between the first collimating lens group and the second collimating lens group meets the following structural parameters:
0.9f 、 4 <L<1.5f 、 4
1.8<r 434 <0.3f 、 4
0.5f 、 4 <f 、 412 <f 、 4
25f 、 4 <f 、 434 <40f 、 4 ；
the imaging lens group of the CMOS camera imaging system consists of a first bonding part formed by bonding a meniscus lens (5-1) and a biconvex lens (5-2) by ultraviolet photosensitive glue, a biconvex thick lens (5-3) and a meniscus negative lens (5-4).
2. The disposable hard tube endoscope optical system according to claim 1, wherein the hard tube endoscope body is composed of 1:1 symmetrical image transfer system, the 3 groups of optical structures are the same 1: the 1-symmetry image transfer system is composed of 6 biconvex thick lenses with the same spherical radius.
3. The disposable hard tube endoscope optical system according to claim 1, wherein the imaging lens group of the CMOS camera imaging system has a focal length f 5 It is identical to the foregoingThe focal length of the collimating lens group of the CMOS camera imaging system meets the following conditions:
1.5f 、 4 <f 、 5 <2f 、 4 。
4. the disposable hard tube endoscope optical system of claim 1, wherein: the collimating lens group has the same optical structure as the 3 groups 1: the final image of the 1-symmetry image-turning system is amplified to infinity.
5. The disposable hard tube endoscope optical system of claim 1, wherein: the imaging lens group of the CMOS camera imaging system can collect and image an image at infinity on a CMOS image plane, and further correct spherical aberration, coma aberration, field curvature, chromatic aberration and other aberration of the hard tube endoscope body.
6. The disposable hard tube endoscope optical system of claim 1, wherein: with the aid of an electronic field stop, the imaging field range is set by computer software to display no image for pixels outside the range of 3.2mm of the CMOS center diameter, and a direction indicator is set.
7. A nasosinusitis, characterized in that: use of a disposable hard tube endoscope optical system as defined in any one of claims 1-6.
8. An arthroscope, characterized in that: use of a disposable hard tube endoscope optical system as defined in any one of claims 1-6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210074763.5A CN114355604B (en) | 2022-01-21 | 2022-01-21 | Disposable hard tube endoscope optical system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210074763.5A CN114355604B (en) | 2022-01-21 | 2022-01-21 | Disposable hard tube endoscope optical system |
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| CN114355604B true CN114355604B (en) | 2024-03-01 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005099080A (en) * | 2003-09-22 | 2005-04-14 | Pentax Corp | Imaging optical system, imaging apparatus for endoscope and endoscopic system |
| CN105278094A (en) * | 2014-06-24 | 2016-01-27 | 中国航天科工集团第三研究院第八三五八研究所 | Hard-tube endoscope optical system |
| JP2017221658A (en) * | 2016-06-10 | 2017-12-21 | 株式会社Ｊｖｃケンウッド | Rigid endoscope system |
| CN207096564U (en) * | 2017-06-30 | 2018-03-13 | 鹰利视医疗科技有限公司 | Hard pipe type endoscopic optical is imaged display system |
| CN210803862U (en) * | 2019-11-29 | 2020-06-19 | 重庆西山科技股份有限公司 | Endoscope optical system and eyepiece optical unit |
-
2022
- 2022-01-21 CN CN202210074763.5A patent/CN114355604B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005099080A (en) * | 2003-09-22 | 2005-04-14 | Pentax Corp | Imaging optical system, imaging apparatus for endoscope and endoscopic system |
| CN105278094A (en) * | 2014-06-24 | 2016-01-27 | 中国航天科工集团第三研究院第八三五八研究所 | Hard-tube endoscope optical system |
| JP2017221658A (en) * | 2016-06-10 | 2017-12-21 | 株式会社Ｊｖｃケンウッド | Rigid endoscope system |
| CN207096564U (en) * | 2017-06-30 | 2018-03-13 | 鹰利视医疗科技有限公司 | Hard pipe type endoscopic optical is imaged display system |
| CN210803862U (en) * | 2019-11-29 | 2020-06-19 | 重庆西山科技股份有限公司 | Endoscope optical system and eyepiece optical unit |
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| CN114355604A (en) | 2022-04-15 |
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