CN100478730C - Objective lens for endoscope - Google Patents
Objective lens for endoscope Download PDFInfo
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- CN100478730C CN100478730C CNB2007100052504A CN200710005250A CN100478730C CN 100478730 C CN100478730 C CN 100478730C CN B2007100052504 A CNB2007100052504 A CN B2007100052504A CN 200710005250 A CN200710005250 A CN 200710005250A CN 100478730 C CN100478730 C CN 100478730C
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Abstract
The invention provides an objective lens for endoscope, which can not only ensure the sufficient rear cut-off distance of a light path transformation prism is inserted on the image side, but also well correct ratio chromatism. The objective lens for endoscope with the rear cut-off distance (Bf) of an overall system longer than the length of 2.5 times of the synthesized focal length f of the overall system comprises the follows in order on the object side: a front divergent lens system (G1); an aperture stop (St) and a back convergent lens system (G2). A joint lens(L34) consisting of a third lens (L3) and a fourth lens (L4) is arranged on the image side, which is closest to the back convergent lens system (G2). The joint lens (L34) meets the following conditional expression:|Upsilon3-Upsilon4|*f<2>/(|RA|*(Bf+DA/n4)) is more than or equal to 9 ellipsis ellipsis In the conditional expression, Upsilon 3 is the Abbe number of a third lens (L3); Upsilon 4 is the Abbe number of a fourth lens (L4); RA is the radius of curvature of the joint face of the third lens (L3) and the fourth lens (L4); DA is the central thickness of the fourth lens (L4); n4 is the refractive index of the fourth lens (L4).
Description
Technical field
The present invention relates to the object lens that are provided with at the leading section of introscope, particularly a kind of can be at the such pairing objective lens for endoscope of the optical system with longer rear cut-off distance of its image planes side configuration optical path shifting prism.
Background technology
In the past, the known introscope that a kind of structure that CCD solid-state imagers such as (Charge Coupled Device) is disposed according to the mode parallel with length direction at leading section is arranged.Figure 17 represents the summary of the objective lens optical system in this introscope.As shown in figure 17, solid-state imager 200 is disposed at the leading section of introscope according to the mode parallel with direction of principal axis (length direction) Z.And, between these object lens 100 and this solid-state imager 200, dispose optical path shifting prism 102 across cover plate (cover glass) 101 insertions.The optical axis Z1 of object lens 100 is spent by warpage approximate 90 to the direction of solid-state imager 200 by optical path shifting prism 102.The size of this optical path shifting prism 102 determines by picture size, need fully guarantee the distance (roughly equating with rear cut-off distance) from the final face of the object lens 100 that are inserted into configuration optical path shifting prism 102 to image space P.Therefore, need compare the long object lens of rear cut-off distance with the focal length of total system.But,, therefore be difficult to obtain enough rear cut-off distances even the object lens that introscope is used have the tendency that picture size the same focal length also shortens along with the requirement of its wide-angleization.At this point, the applicant has proposed to compare with the synthetic focal distance f of total system the objective lens for endoscope of sufficiently long three groups of four pieces of structures of rear cut-off distance in patent documentation 1.
On the other hand, objective lens for endoscope is most F value big (promptly dark) in order to deepen the depth of field, and spherical aberration or coma seldom become the major reason of decision image quality, can enumerate ratio chromatism, as the major reason of image quality deterioration.Particularly in recent years, along with the densification of solid-state imager development makes pixel count increase, need carry out the abundant correction of ratio chromatism.In order to proofread and correct ratio chromatism,, preferably at the optics of bearing the ratio chromatism, correction tasks away from the location of aperture setting.Particularly in the picture side of diaphragm, dispose the optics of taking on the ratio chromatism, correction tasks more near the position of imaging surface, its effect is remarkable more.But, in the long lens combination of rear cut-off distance, there is not optics near the position of imaging surface, so the correction of ratio chromatism, and being not easy.Though the objective lens for endoscope of patent documentation 1 record has enough rear cut-off distances,, for the correction of ratio chromatism,, room for improvement is arranged still.
[patent documentation 1] TOHKEMY 2005-148508 communique
Summary of the invention
The present invention puts in view of the above problems and proposes, and its purpose is to provide a kind of objective lens for endoscope of not only guaranteeing the rear cut-off distance of sufficient length but also can proofreading and correct ratio chromatism, well.
Objective lens for endoscope of the present invention, possess successively from object side: preceding group of divergent lens system, aperture diaphragm and back group convergent lens system, the rear cut-off distance of total system is than 2.5 double-lengths of the synthetic focal length of total system, wherein, preceding group of divergent lens system is that one piece of first negative lens of concave surface constitute by the face of image planes side; Group convergent lens in back is constructed as follows: promptly dispose convex surface successively towards second lens of the positive meniscus shape of image planes side with to be positive lens and the opposing party according to any one party be joint lens that formed by the 3rd lens and the 4th lens that the mode of negative lens constitutes from object side, and, satisfy following conditional, υ
|υ
3-υ
4|×f
2/{|R
A|·(Bf+D
A/n
4)}≥9 ……(1)
Wherein, f is the synthetic focal length of total system, and Bf is the rear cut-off distance of total system, υ
3Be the Abbe number of the 3rd lens L3, υ
4Be the Abbe number of the 4th lens L4, R
ABe the radius-of-curvature on the composition surface of the 3rd lens and the 4th lens, D
ABe the center thickness of the 4th lens, n
4It is the refractive index of the 4th lens.
In objective lens for endoscope of the present invention, engage lens as taking on the optics that ratio chromatism, is proofreaied and correct in the configuration of image planes side, and make these joint lens formula (1) that satisfies condition, thus, not only guarantee to insert the rear cut-off distance of the sufficient length of configuration optical path shifting prism in the image planes side, and can proofread and correct ratio chromatism, well.
In objective lens for endoscope of the present invention, the Abbe number that engages the negative lens in the lens is made as υ
-, preferably satisfy following conditional.Thus, can the easier correction of carrying out ratio chromatism.
υ
-＜22 ……(2)
According to objective lens for endoscope of the present invention, possess successively from object side: preceding group of divergent lens system, aperture diaphragm and back group convergent lens system, the rear cut-off distance of total system is than 2.5 double-lengths of the synthetic focal length of total system, wherein, configuration engages lens as taking on the optics that ratio chromatism, is proofreaied and correct on the most close image planes side of back group convergent lens, and make these joint lens formula (1) that satisfies condition, thus, not only guarantee to insert the rear cut-off distance of the sufficient length of configuration optical path shifting prism in the image planes side, and can proofread and correct ratio chromatism, well.
Description of drawings
Fig. 1 is the pairing lens cut-open view of objective lens for endoscope that the embodiment of the invention 1 relates to.
Fig. 2 is the pairing lens cut-open view of objective lens for endoscope that the embodiment of the invention 2 relates to.
Fig. 3 is the pairing lens cut-open view of objective lens for endoscope that the embodiment of the invention 3 relates to.
Fig. 4 is the pairing lens cut-open view of objective lens for endoscope that the embodiment of the invention 4 relates to.
Fig. 5 is the figure of the lens data of the objective lens for endoscope that relates to of the expression embodiment of the invention 1.
Fig. 6 is the figure of the lens data of the objective lens for endoscope that relates to of the expression embodiment of the invention 2.
Fig. 7 is the figure of the lens data of the objective lens for endoscope that relates to of the expression embodiment of the invention 3.
Fig. 8 is the figure of the lens data of the objective lens for endoscope that relates to of the expression embodiment of the invention 4.
Fig. 9 is the figure that other each uniform data is represented at each embodiment.
Figure 10 is the aberration diagram of each aberration of the objective lens for endoscope that relates to of the expression embodiment of the invention 1, (A) is spherical aberration, (B) is astigmatism, (C) is distortion (distortion), (D) is ratio chromatism.
Figure 11 is the aberration diagram of each aberration of the objective lens for endoscope that relates to of the expression embodiment of the invention 2, (A) is spherical aberration, (B) is astigmatism, (C) is distortion (distortion), (D) is ratio chromatism.
Figure 12 is the aberration diagram of each aberration of the objective lens for endoscope that relates to of the expression embodiment of the invention 3, (A) is spherical aberration, (B) is astigmatism, (C) is distortion (distortion), (D) is ratio chromatism.
Figure 13 is the aberration diagram of each aberration of the related objective lens for endoscope of the expression embodiment of the invention 4, (A) is spherical aberration, (B) is astigmatism, (C) is distortion (distortion), (D) is ratio chromatism.
Figure 14 is the lens cut-open view of structure of representing the objective lens for endoscope of comparative example of the present invention relatively.
Figure 15 is the figure of lens data that represents the objective lens for endoscope of comparative example of the present invention relatively.
Figure 16 is the aberration diagram of each aberration of representing the objective lens for endoscope of comparative example of the present invention relatively, (A) is spherical aberration, (B) is astigmatism, (C) is distortion (distortion), (D) is ratio chromatism.
Figure 17 is the pie graph of the summary of the objective lens optical system in the existing introscope of expression.
Among the figure: group divergent lens system before the G1-, organize convergent lens system behind the G2-, GP-optical path shifting prism, L1-first lens, L2-second lens, L3-the 3rd lens, L4-the 4th lens, L34-engages lens, the St-aperture diaphragm, Ri-is apart from the radius-of-curvature of the lens face of object side i face, and Di-is apart from the interval of the face between the lens face of object side i face and i+1 face, Z1-optical axis.
Embodiment
Below, with reference to accompanying drawing embodiments of the present invention are elaborated.
Fig. 1 represents first configuration example of the objective lens for endoscope that one embodiment of the present invention relates to.This configuration example constitutes corresponding with the lens of the first numerical value embodiment (Fig. 5) described later.Fig. 2 represents second configuration example.This configuration example constitutes corresponding with the lens of second value embodiment described later (Fig. 6).Fig. 3 represents the 3rd configuration example.This configuration example constitutes corresponding with the lens of third value embodiment described later (Fig. 7).Fig. 4 represents the 4th configuration example.This configuration example constitutes corresponding with the lens of the 4th numerical value embodiment (Fig. 8) described later.In Fig. 1～Fig. 4, symbol Ri represents along with the mode that increases in turn towards image planes side (imaging side), to be endowed the radius-of-curvature of the i face of symbol as number one according to the face of the inscape of close object side.Symbol Di represents i face and the i+1 face face on optical axis Z1 at interval.In addition, because the basic comprising of each configuration example is all identical, so, be that the basis describes with first configuration example shown in Figure 1 below.
This objective lens for endoscope is set at the leading section of introscope, is preferably used the object lens of the introscope (with reference to Figure 17) that disposes abreast as solid-state imager and direction of principal axis (length direction) especially.This objective lens for endoscope has from object side in turn along optical axis Z1: integral body has preceding group of divergent lens system G1, aperture diaphragm St and the whole back group of convergent lens system G2 with positive refracting power of negative refracting power.At the image planes side of this objective lens for endoscope configuration optical path shifting prism GP, and near the image planes side of this optical path shifting prism GP solid-state imager such as configuration CCD.Between optical path shifting prism GP and solid-state imager, also dispose other optics such as cover plate sometimes.In addition, P is expressed as the image position in Fig. 1～Fig. 4.In Fig. 1～Fig. 4, though illustrate according to making image space P and incident light axis Z1 become unidirectional mode along launching of equal valuely optical path shifting prism GP with the same direction of incident light axis Z1, but, in fact same with configuration example shown in Figure 17, adopt following formation: promptly make roughly 90 degree of light path bending by optical path shifting prism GP.
Preceding group divergent lens system G1 is made of the first lens L1, and back group convergent lens system G2 is made of the second lens L2 and joint lens L34 in turn from object side.Engaging lens L34 is made of the 3rd lens L3 and the 4th lens L4.Thus, the whole lens arrangement that adopts three groups four pieces of this objective lens for endoscope.
The first lens L1 becomes the negative lens of the little face of radius-of-curvature towards the image planes side.The face that the first lens L1 is for example formed the image planes side is a concave surface and the face of object side is the plano-concave lens on plane.The second lens L2 is formed the lens of convex surface towards positive bent moon (meniscus) shape of image planes side.In engaging lens L34, any one party of the 3rd lens L3 and the 4th lens L4 is made of positive lens and the opposing party is made of negative lens.In first, third and fourth configuration example of Fig. 1, Fig. 3 and Fig. 4, the 3rd lens L3 is biconvex positive lens, and the 4th lens L4 becomes the negative lens of concave surface towards the meniscus shape of object side.In second configuration example of Fig. 2, the 3rd lens L3 becomes the negative lens of concave surface towards the meniscus shape of image planes side, and the 4th lens L4 becomes biconvex positive lens.
This objective lens for endoscope constitutes, and the rear cut-off distance Bf of total system is longer than 2.5 times of synthetic focal distance f of total system, and satisfies following condition.
|υ
3-υ
4|×f
2/{|R
A|·(Bf+D
A/n
4)}≥9 ……(1)
Wherein, establish υ
3Be the Abbe number of the 3rd lens L3, υ
4Be the Abbe number of the 4th lens L4, R
ABe the radius-of-curvature on the composition surface of the 3rd lens L3 and the 4th lens L4, D
ABe the center thickness of the 4th lens L4, n
4It is the refractive index of the 4th lens L4.
And, in this objective lens for endoscope, the Abbe number that engages the negative lens among the lens L34 is made as υ
-, preferably satisfy following conditional.
υ
-＜22 ……(2)
Then, effect and the effect to the objective lens for endoscope that constituted as mentioned above describes.
In this objective lens for endoscope, possess successively from object side: preceding group of divergent lens system G1, aperture diaphragm St and back group convergent lens G2, in the lens combination of the rear cut-off distance Bf of total system than 2.5 double-lengths of the synthetic focal distance f of total system, engage lens L34 in position configuration and be used as taking on the optics that ratio chromatism, is proofreaied and correct away from aperture diaphragm St, and make these joint lens L34 formula (1) that satisfies condition, thus, not only guarantee to insert the rear cut-off distance of the sufficient length of configuration optical path shifting prism in the image planes side, and can proofread and correct ratio chromatism, well.Conditional (1) expression is at taking on the degree of correction of ratio chromatism, that optics that ratio chromatism, proofreaies and correct promptly engages the composition surface of lens L34.Conditional (1) is constitute to engage Abbe number poor of the 3rd lens L3 of lens L34 and the 4th lens L4 | υ
3-υ
4|, divided by with the synthetic focal distance f of total system the radius of curvature R on composition surface of standardized joint lens L34
A, and the rear cut-off distance Bf of total system has been added the air characteristic chamber length D of the 4th lens L4
A/ n
4Value (Bf+D
A/ n
4).The Abbe number of conditional (1) expression the 3rd lens L3 and the 4th lens L4 is poor | υ
3-υ
4| big more, the radius of curvature R on composition surface
AMore little, composition surface and image space are short more, help the correction of ratio chromatism, more.
Usually, in the inadequate imaging len of chromatic aberration correction, because short wavelength's focal distance ratio long wavelength's focal length is short, so, for axial chromatic aberration and ratio chromatism,, short wavelength's the minus side that all is positioned at reference wavelength (not enough (under)).Here, under the situation that the deficiency of ratio chromatism, is proofreaied and correct, than aperture diaphragm St by rear place, the Abbe number of positive lens can be increased, the Abbe number of negative lens is reduced.Therefore, the Abbe number that preferably will engage the negative lens of lens L34 reduces to satisfy above-mentioned conditional (2).Thus, the correction of ratio chromatism, is more prone to.
As described above, the objective lens for endoscope that relates to according to present embodiment, possess successively from object side: preceding group of divergent lens system G1, aperture diaphragm St, with back group convergent lens G2, and in the lens combination of the rear cut-off distance Bf of total system than 2.5 double-lengths of the synthetic focus f of total system, the most close image planes side configuration at back group convergent lens system G2 engages lens L34 as taking on the optics that ratio chromatism, is proofreaied and correct, and make these joint lens L34 formula (1) that satisfies condition, so, not only guarantee to insert the rear cut-off distance of the sufficient length of configuration optical path shifting prism in the image planes side, and can proofread and correct ratio chromatism, well.
In addition, in the above description, for example understand the lens combination of the rear cut-off distance Bf of total system than 2.5 double-lengths of the synthetic focal distance f of total system, because if rear cut-off distance Bf is long, then can insert big optical path shifting prism GP, this moment, efficient beam can increase prism dimensions relatively, helped the generation that suppresses ghost image (ghost) or dazzle light (flare) thus.In addition, under the situation that does not increase prism dimensions, can finally between lens and optical path shifting prism GP, guarantee enough intervals, have the advantages such as insertion that easily to carry out color filter as required.Fully obtain under the situation of these advantages wanting, the rear cut-off distance Bf of preferred total system is more than three times of synthetic focal distance f of total system.
(embodiment)
Then, the concrete numerical value embodiment of the objective lens for endoscope that present embodiment is related to describes.Below, the numerical value embodiment to first～the 4th concludes explanation.
Fig. 5 represents the basic lens data of the objective lens for endoscope that embodiment 1 relates to.The basic lens of the objective lens for endoscope that this embodiment 1 relates to constitute, and are illustrated with reference to Fig. 1.In the face of lens data shown in Figure 5 numbering Si one hurdle, the face of having represented the inscape of close object side is as number one, according to the number of i (i=1～10) face that has been endowed symbol towards the mode that increases successively as side.In radius of curvature R i one hurdle, corresponding with the symbol Ri that gives in Fig. 1, expression is apart from the value (mm) of the radius-of-curvature of object side i face.In face interval D i one hurdle, represented the interval (mm) on the optical axis of object side i face Si and i+1 face Si+1 too.Ndj represents the value of the refractive index of the relative d line (wavelength 587.6nm) between the adjacent lenses face.In υ dj one hurdle, expression is apart from the value of the Abbe number of the relative d line of object side j (j=1～5) individual optical parameter.In addition, with the numerical standardization of radius of curvature R i and face interval D i so that the synthetic focal distance f of total system becomes 0.5mm.
According to the same mode of objective lens for endoscope that relates to above embodiment 1, Fig. 6 represents the basic lens data of the objective lens for endoscope that embodiment 2 relates to.The basic lens of the objective lens for endoscope that embodiment 2 relates to constitute, and are illustrated with reference to Fig. 2.Equally, Fig. 7 represents the basic lens data of the objective lens for endoscope that embodiment 3 relates to.The basic lens of the objective lens for endoscope that embodiment 3 relates to constitute, and are illustrated with reference to Fig. 3.Equally, Fig. 8 represents the basic lens data of the objective lens for endoscope that embodiment 4 relates to.The basic lens of the objective lens for endoscope that embodiment 4 relates to constitute, and are illustrated with reference to Fig. 4.In addition, in embodiment 2～embodiment 4 similarly to Example 1, with the numerical standardization of radius of curvature R i and face interval D i so that the synthetic focal distance f of total system becomes 0.5mm.
Fig. 9 represents the value as value of the ratio chromatism, at the picture size of the object lens of other each data, each embodiment, subject distance, field angle, rear cut-off distance Bf, maximum field of view angle (F line-C line) and above-mentioned conditional.In addition, the C line is that wavelength 656.27nm, F line are wavelength 486.13nm.As can be seen from Figure 9, the value of each embodiment is in the numerical range of each conditional.And for each embodiment, the rear cut-off distance Bf of total system is than 2.5 double-lengths of the synthetic focal distance f of total system.Especially in embodiment 1～embodiment 3, the rear cut-off distance Bf of total system is than three double-lengths of the synthetic focal distance f of total system.In addition, the υ in each conditional
3, υ
4, υ-and n
4By the d line is calculated as reference wavelength.
The value of also having represented the objective lens for endoscope that the relative present embodiment of objective lens for endoscope of comparative example relates among Fig. 9.The objective lens for endoscope of comparative example depart from from the value of each conditional, and the value of ratio chromatism, is compared increase with the value of each embodiment.Here, Figure 14 represents the formation of the objective lens for endoscope of comparative example.In addition, Figure 15 has represented the basic lens data of the objective lens for endoscope of comparative example.The part that symbol is corresponding with the objective lens for endoscope that present embodiment relates to is invested same mark.This comparative example is recited as embodiment 2 in above-mentioned patent documentation 1 (spy opens flat 2005-148508 communique).In addition, for this comparative example, with the numerical standardization of radius of curvature R i and face interval D i so that the synthetic focal distance f of total system becomes 0.5mm.
Figure 10 (A)～Figure 10 (D) represents spherical aberration, astigmatism, distortion (distortion aberration) and the ratio chromatism, of the objective lens for endoscope that embodiment 1 relates to respectively.In each aberration diagram, represented with the d line to be the aberration of reference wavelength.Spherical aberration has also been represented the aberration at C line and F line.Ratio chromatism, is represented relative C line and F line.FNO. mean that F value, ω represent angle of half field-of view.
Equally, each aberration of Figure 11 (A)～objective lens for endoscope that Figure 11 (D) expression embodiment 2 relates to, each aberration of Figure 12 (A)～objective lens for endoscope that Figure 12 (D) expression embodiment 3 relates to, each aberration of Figure 13 (A)～objective lens for endoscope that Figure 13 (D) expression embodiment 4 relates to.And, each aberration of the objective lens for endoscope of Figure 16 (A)～Figure 16 (D) expression Figure 14 and comparative example shown in Figure 15.
By each above numeric data and each aberration diagram as can be known, each embodiment compares with the objective lens for endoscope of comparative example, can realize especially ratio chromatism, by well-corrected objective lens for endoscope.
In addition, the present invention is not limited to above-mentioned embodiment and each embodiment, and various distortion implements to be all possibility.For example, the value of the radius-of-curvature of each lens composition, face interval and refractive index etc. are not limited to the value shown in above-mentioned each data embodiment, also can get other value.
Claims (2)
1. objective lens for endoscope possesses successively from object side: preceding group of divergent lens system, aperture diaphragm and back group convergent lens system, the rear cut-off distance of total system be than 2.5 double-lengths of the synthetic focal length of total system,
The group divergent lens system is that one piece of first negative lens of concave surface constitute by the face of image planes side before described,
Described back group convergent lens is constructed as follows: dispose convex surface successively towards second lens of the positive meniscus shape of image planes side with to be positive lens and the opposing party according to any one party be joint lens that formed by the 3rd lens and the 4th lens that the mode of negative lens constitutes from object side, and, satisfy following conditional
|υ
3-υ
4|×f
2/{|R
A|·(Bf+D
A/n
4)}≥9 ……(1)，
Wherein,
F: the synthetic focal length of total system,
Bf: the rear cut-off distance of total system,
υ
3: the Abbe number of the 3rd lens,
υ
4: the Abbe number of the 4th lens,
R
A: the radius-of-curvature on the composition surface of the 3rd lens and the 4th lens,
D
A: the center thickness of the 4th lens,
n
4: the refractive index of the 4th lens.
2, objective lens for endoscope according to claim 1 is characterized in that,
With the Abbe number that engages the negative lens in the lens be made as υ _, satisfy following conditional,
υ_＜22 ……(2)。
Applications Claiming Priority (3)
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|---|---|---|---|
| JP2006036582 | 2006-02-14 | ||
| JP2006036582 | 2006-02-14 | ||
| JP2006140242 | 2006-05-19 |
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| CN100478730C true CN100478730C (en) | 2009-04-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100582855C (en) * | 2007-08-23 | 2010-01-20 | 鸿富锦精密工业（深圳）有限公司 | Endoscopy lens and endoscopy device |
| CN101408662B (en) * | 2007-10-11 | 2010-06-02 | 鸿富锦精密工业（深圳）有限公司 | Wide-angle lens |
| AU2010281512A1 (en) * | 2009-07-29 | 2012-02-16 | Alcon Lensx, Inc. | Optical system for ophthalmic surgical laser |
| CN102713717B (en) * | 2010-05-20 | 2014-07-02 | 奥林巴斯医疗株式会社 | Endoscope objective lens unit and endoscope |
| CN103748496B (en) * | 2011-08-25 | 2016-10-19 | 富士胶片株式会社 | Imaging lens and the imaging device including this imaging lens |
| EP2662718B1 (en) * | 2011-10-06 | 2016-04-27 | Olympus Corporation | Optical system for endoscope |
| TWI456287B (en) * | 2012-02-15 | 2014-10-11 | Largan Precision Co Ltd | Optical lens system |
| EP3260899A4 (en) * | 2015-02-20 | 2018-11-14 | Olympus Corporation | Oblique-view objective optical system and oblique-view endoscope equipped with same |
| CN109044246A (en) * | 2018-09-19 | 2018-12-21 | 苏州大学 | A kind of endoscopic optical system |
| CN111610000B (en) * | 2020-05-14 | 2022-04-19 | 中国科学院光电技术研究所 | Method for measuring multiplying power chromatic aberration of star sensor optical system based on angle |
| CN113866994B (en) * | 2020-06-30 | 2023-04-18 | 上海微电子装备（集团）股份有限公司 | Collimating lens and image sensor |
| CN112748556B (en) * | 2020-12-31 | 2023-04-14 | 上海澳华内镜股份有限公司 | Endoscope optical system |
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