CN103969819A - Stray light removing hard tube endoscope optical system - Google Patents
Stray light removing hard tube endoscope optical system Download PDFInfo
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- CN103969819A CN103969819A CN201310027055.7A CN201310027055A CN103969819A CN 103969819 A CN103969819 A CN 103969819A CN 201310027055 A CN201310027055 A CN 201310027055A CN 103969819 A CN103969819 A CN 103969819A
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Abstract
The invention provides an optical system of a hard tube endoscope. The optical system comprises an objective lens set and a relay system. The objective lens set comprises a first lens set, a second lens set, a third lens set and a fourth lens set. An aperture diaphragm is located in the second lens set. The relay system is composed of odd number pairs of transferring lens with the magnifying power being 1:1, the relay system comprises two completely same tri-agglutination bar lenses, the distances between every two adjacent bar lenses are equal, and images formed by objective lenses are transferred in a working telescope many times. A final image is received through the ocular lens human eye or a CCD detector. The full field angle of the system is within 70 degrees, stray light does not exist in an image plane when the system aligns with a light source, the interference on imaging from the stray light entering a lens cone is completely removed, the MTF value is larger than 0.3 at the 1,201p/mm position, and the optical system has the advantages of being large in visual field and field depth, small in field curvature, capable of removing distortion, even in brightness, simple in structure, low in cost and the like. The picture 1 is the structural representation of the optical system of the non-stray-light hard tube endoscope, and the number 1 is the objective lens set.
Description
Technical field
The present invention relates to a kind of optical system of rigid pipe endoscope, particularly a kind of veiling glare, large visual field, the large depth of field, the little curvature of field, the distortion that disappears, even, simple in structure and lower-cost endoscope optical system of brightness eliminated.
Background technology
Medical endoscope is the natural duct through human body, or mini-incision enters the apparatus of observing and treating in human body.It,, by utilizing many group relay lens group, repeatedly transmits object lens imaging in elongated lens barrel, finally via eyepiece, arrives human eye or is received by ccd detector.
Although the manufacture process technology of medical endoscope is quite ripe at present, more existing endoscope product exist more serious veiling glare problem.As shown in Figure 1, certain endoscope product is aimed to light source at a distance observes, when light source is positioned at visual field, center, picture point has unconspicuous veiling glare around, when light source departs from center, occurs that a center of circle is positioned at the veiling glare ring of field of view center in image planes, along with light source position moves to field of view edge, veiling glare ring increases thereupon, and radius equates with image height all the time, and home position remains unchanged.Veiling glare in image planes mixes with picture, affects observation and the demonstration of picture.
Summary of the invention
The present invention proposes in view of this situation of prior art just, its object be to provide a kind of can effectively eliminate veiling glare, large visual field, the large depth of field, the little curvature of field, the distortion that disappears, brightness evenly, be convenient to process the endoscope optical system of debuging.
In order to achieve the above object, the invention provides following scheme.
A rigid pipe endoscope, is characterized in that, it comprises objective lens and relay system, and described objective lens, relay system are arranged in order from object side, eye lens or ccd detector after relay system.
In one embodiment of the present of invention, described objective lens is comprised of four groups of lens combination: the 1st lens are negative lens, and face type is platycelous, and object side is plane, realizes the object that the present invention has 70 ° of larger visual fields; The 2nd lens are cemented doublet, by two meniscus shaped lens gummeds, are formed, and aperture diaphragm is positioned on cemented surface; The 3rd lens are cemented doublet, by a slice biconvex lens and a slice meniscus shaped lens gummed, are formed; The 4th lens are a slice falcate simple lens.
In one embodiment of the present of invention, described relay system is comprised of image rotation lenses group odd number, every pair of image rotation lenses group comprises two identical bar-shaped three balsaming lenss of structured material, its structure is a bar-shaped simple lens of longer biconvex, the thin meniscus shaped lens of a slice is respectively glued together at simple lens two ends, bar-shaped simple lens structural symmetry wherein, and two thin lens planforms and the material of gummed are identical, be the structure that above-mentioned bar-shaped three balsaming lenss are full symmetric, its Refractive Index of Material is all less than 1.8.Above-mentioned odd number is arranged in order after objective lens image rotation lenses group, and between each excellent mirror, distance equates.
Adopt embodiments of the invention, the light that object sends forms 1 handstand intermediary image through above-mentioned object lens, in the air of image planes between described objective lens and relay system; Intermediary image by image rotation repeatedly, has the intermediary image of equal and opposite in direction direction reversing in relay system in the air between every group of image rotation group, obtain upright intermediary image after relay system, finally by eyepiece or ccd detector, is received.
In the above-described embodiments, between the 1st, 2 lens of described objective lens, there is larger airspace, the lens thickness of the 2nd lens is thinner, the clear aperture of its front surface is very little, aperture diaphragm is positioned at the cemented surface place of the 2nd lens, owing to having this kind of design feature, this objective lens can be eliminated the veiling glare that enters internal system completely.
In the above-described embodiments, the material structure of the rod-shaped lens of composition relay system is identical, and its Refractive Index of Material is all less than 1.8, effectively cuts down finished cost.
In the above-described embodiments, the mtf value that is finally imaged on each visual field, 120lp/mm place is all greater than 0.3, and each aberration is all well proofreaied and correct, and picture element is desirable; The distortion of system, in 20%, can substantially be eliminated distortion after digital processing is proofreaied and correct, and distortion is less than 2%; Image planes relative exposure corresponding to each visual field is all more than 90%, and image planes brightness is even; The system depth of field is large, the curvature of field is little, simple in structure and cost is lower.
Endoscope optical system of the present invention, by objective lens and relay system, formed, can eliminate the interference of veiling glare completely, it is simple in structure, being convenient to processing debugs, field angle can obtain good picture element at 70 ° with interior in the situation that, thereby forms eliminate stray light, large visual field, the large depth of field, the little curvature of field, the distortion that disappears, brightness is even, simple in structure and picture element is good endoscope optical system.
Accompanying drawing explanation
Fig. 1 is the image planes veiling glare situation of certain endoscope product when alignment light source is observed;
Fig. 2 is the one-piece construction figure of the endoscope optical system of embodiments of the invention 1, and wherein 1 is objective lens;
Fig. 3 means the structural drawing of the objective lens of Fig. 2;
Fig. 4 means the structural drawing of one group of relaying image rotation group of Fig. 2;
Fig. 5 is the aberration diagram of the endoscope of the embodiment of the present invention 1, spherical aberration when wherein (A) is D=0.24mm, the astigmatism while being (B) 2 ω=70 °, (C) distortion while being 2 ω=70 °, wherein 1 is d light, the 2nd, F light, the 3rd, C light, the 4th, meridian, the 5th, the sagitta of arc;
Emulation image planes Illumination Distribution when Fig. 6 is 1 pair of light source different angles of the embodiment of the present invention;
Fig. 7 is the endoscope image planes relative exposure curve map of the embodiment of the present invention 1, wherein horizontal ordinate be field angle (°), ordinate is relative exposure (%);
Fig. 8 is the one-piece construction figure of the endoscope optical system of embodiments of the invention 2, and wherein 1 is objective lens;
Fig. 9 means the structural drawing of the objective lens of Fig. 8;
Figure 10 means the structural drawing of one group of relaying image rotation group of Fig. 8;
Figure 11 is the aberration diagram of the endoscope of the embodiment of the present invention 2, spherical aberration when wherein (A) is D=0.24mm, the astigmatism while being (B) 2 ω=70 °, (C) distortion while being 2 ω=70 °, wherein 1 is d light, the 2nd, C light, the 3rd, F light, the 4th, meridian, the 5th, the sagitta of arc;
Figure 12 is the endoscope image planes relative exposure curve map of the embodiment of the present invention 2, wherein horizontal ordinate be field angle (°), ordinate is relative exposure (%).
Embodiment
Below, with reference to Fig. 2～Figure 12 also in conjunction with the embodiments, further set forth the present invention.
Fig. 2 is the one-piece construction figure of embodiment 1, and as shown in Figure 2, all optical elements in objective of endoscope group and relay system all arrange in lens barrel successively along optical axis.
Fig. 3 is the structural drawing of the objective lens of embodiment 1, is arranged on the cephalic par of endoscope, comprises first lens group L1, the second lens combination L2, the 3rd lens combination L3 and the 4th lens combination L4, after intermediary image that objective lens becomes is positioned at the 4th lens combination L4.
First lens group L1 is negative lens, and its face type is platycelous, towards object side, is plane; The second lens combination L2 is formed by two meniscus shaped lens gummeds, is provided with aperture diaphragm S on cemented surface; The 3rd lens combination L3 is that biconvex positive lens and negative meniscus gummed form; The 4th lens combination L4 is positive lens, and face type is falcate.
Light is after by first lens group L1, and owing to having very large airspace between first lens group L1 and the second lens combination L2, the veiling glare that part incident angle is larger projects lens barrel inwall, is absorbed; Another part projects the front surface of the second lens combination L2, and because the clear aperture of this face is less, this part veiling glare cannot pass through, and by the end face of front surface, is absorbed; In light by front surface, still have the veiling glare with larger incident angle, this part light is stopped by diaphragm S; Light by diaphragm S is all imaging light, so veiling glare all eliminated, and only has the picture point that light source is corresponding in image planes.Light source is positioned at its corresponding image planes emulation Illumination Distribution of different field angle as shown in Figure 6.
Fig. 4 is the structural drawing of one group of relaying image rotation group of embodiment 1, after being arranged on objective lens, comprise the 5th lens combination L5 and the 6th lens combination L6, the front end of the 5th lens combination L5 is the intermediary image that object lens become, the rear end of the 6th lens combination L6 intermediary image that image rotation group becomes for this reason.
The 5th lens combination L5 is combined into by three lens glues, and lens 51 are a slice negative meniscus, and lens 52 are the biconvex rod-shaped lens of a symmetry, and lens 53 are identical with the structured material of lens 51.The 6th lens combination L6 is identical with the 5th lens combination L5.
As Fig. 2, relay system comprises the image rotation group shown in odd number group Fig. 4, and the distance between adjacent image rotation group equates.In relay system, intermediary image is positioned at the airspace of every group of image rotation group, the equal and opposite in direction of each adjacent intermediary image, opposite direction.
Embodiment 1
As shown in Figure 2, in the present embodiment, the structural parameters of described endoscope are referring to table 1.
Table 1
In above-mentioned table 1, r represents each surperficial radius-of-curvature of lens combination, and unit is mm; D represents the face interval of each lens face of lens combination on optical axis, and unit is mm; Nd represents the refractive index of the relative d light of lens material (wavelength is 587.6nm); Vd represents the Abbe number of the relative d light of lens material.
As shown in Figure 5, the aberration diagram that Fig. 5 is the embodiment of the present invention, wherein (A) is spherical aberration, is (B) astigmatism, is (C) distortion; Aberration in each aberration diagram be take d light as reference wavelength, and spherical aberration has represented the aberration of C light and F light, and D represents entrance pupil diameter, and 2 ω represent full field angle.
As shown in Figure 7, the image planes relative exposure curve map that Fig. 7 is the embodiment of the present invention, wherein horizontal ordinate represents the field angle of system, ordinate represents the relative exposure of image planes.
Embodiment 2
As shown in Figure 8, in the present embodiment, the structural parameters of described endoscope are referring to table 2.
Table 2
In above-mentioned table 2, r represents each surperficial radius-of-curvature of lens combination, and unit is mm; D represents the face interval of each lens face of lens combination on optical axis, and unit is mm; Nd represents the refractive index of the relative d light of lens material (wavelength is 587.6nm); Vd represents the Abbe number of the relative d light of lens material.
As shown in figure 11, the aberration diagram that Figure 11 is the embodiment of the present invention, wherein (A) is spherical aberration, is (B) astigmatism, is (C) distortion; Aberration in each aberration diagram be take d light as reference wavelength, and spherical aberration has represented the aberration of C light and F light, and D represents entrance pupil diameter, and 2 ω represent full field angle.
As shown in figure 12, the image planes relative exposure curve map that Figure 12 is the embodiment of the present invention, wherein horizontal ordinate represents the field angle of system, ordinate represents the relative exposure of image planes.
More than show and described ultimate principle of the present invention and main feature and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present invention; under the premise without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications; these changes and improvements all fall in the claimed scope of the invention, and the claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (9)
1. a rigid pipe endoscope optical system, its field angle, in 70 °, comprises objective lens and relay system.
2. endoscope optical system as claimed in claim 1, its objective lens focal length meets 1mm < EFL < 2mm, and relay system magnification is 1: 1.
3. objective lens as claimed in claim 2, is characterized in that: comprise first lens group, the second lens combination, the 3rd lens combination and the 4th lens combination.First lens group is negative lens group, and face type is platycelous; The second lens combination is one group of cemented doublet, by two meniscus shaped lens gummeds, is formed, and aperture diaphragm is positioned on cemented surface; The 3rd lens combination is one group of cemented doublet, by a slice biconvex positive lens and a slice negative meniscus gummed, is formed; The 4th lens are a slice falcate positive lenss.
4. objective lens as claimed in claim 3, is characterized in that: light consists of the intermediary image of a handstand object lens, intermediate image plane is arranged in the air after objective lens.
5. objective lens as claimed in claim 3, it is characterized in that: between first lens group and the second lens combination, have larger airspace, the lens thickness of the second lens combination is less, and the clear aperture of the front surface of the second lens combination is very little, and aperture diaphragm is positioned at the cemented surface of the second lens combination.Adopt the endoscope lens of this kind of design feature can eliminate the veiling glare of the system of entering completely.
6. relay system as claimed in claim 2, it is characterized in that: by odd number, image rotation lenses is formed, every pair of image rotation lenses comprises two identical bar-shaped three balsaming lenss, three balsaming lenss are glued at the bar-shaped simple lens both ends of the surface of symmetrical biconvex by 2 identical meniscus shaped lenses and form, the spacing of adjacent two rod-shaped lens equates, the refractive index of rod mirror material is all less than 1.8, and cost is lower.
7. relay system as claimed in claim 6, is characterized in that: the intermediary image being become by objective lens transmits odd number via relay system, forms intermediary image, adjacent intermediary image equal and opposite in direction, opposite direction in the airspace between image rotation group.
8. endoscopic system as claimed in claim 2, is characterized in that: the field angle of described endoscopic system is in 70 °, and the mtf value at 120lp/mm place is greater than 0.3; Distortion is less than 20%, can substantially eliminate image planes distortion after digital processing is proofreaied and correct, and distortion is less than 2%; The corresponding image planes relative exposure in each visual field is all more than 90%, and image planes brightness is even; The system depth of field is large, the curvature of field is little, simple in structure and cost is lower.
9. the rigid pipe endoscope optical system as described in claim 1 to 8,4 millimeters of the mirror pipe diameters of take are example, and for the rigid pipe endoscope optical system of other diameter mirror pipe, principle is consistent, and structure is similar, only needs to finely tune in parameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310027055.7A CN103969819A (en) | 2013-01-25 | 2013-01-25 | Stray light removing hard tube endoscope optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310027055.7A CN103969819A (en) | 2013-01-25 | 2013-01-25 | Stray light removing hard tube endoscope optical system |
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| CN103969819A true CN103969819A (en) | 2014-08-06 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105361839A (en) * | 2015-11-30 | 2016-03-02 | 青岛大学附属医院 | Endoscope system with improved optical performance |
| CN107085295A (en) * | 2017-06-30 | 2017-08-22 | 江苏鹰利视医疗器械有限公司 | The optical imaging system of endoscope |
| CN107102433A (en) * | 2017-06-30 | 2017-08-29 | 江苏鹰利视医疗器械有限公司 | Hard pipe type endoscopic optical is imaged display system |
| CN111358419A (en) * | 2020-04-18 | 2020-07-03 | 鹰利视医疗科技有限公司 | Rotating image mirror structure of laparoscope |
| JP2021006899A (en) * | 2019-06-06 | 2021-01-21 | オリンパス ビンテル ウント イーベーエー ゲーエムベーハーＯｌｙｍｐｕｓ Ｗｉｎｔｅｒ ＆ Ｉｂｅ Ｇｅｓｅｌｌｓｃｈａｆｔ Ｍｉｔ Ｂｅｓｃｈｒａｎｋｔｅｒ Ｈａｆｔｕｎｇ | Reversal system for endoscope and endoscope |
| WO2022048081A1 (en) * | 2020-09-04 | 2022-03-10 | 鹰利视医疗科技有限公司 | 4k ultra-high-definition laparoscopic relay lens structure |
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| JP2005091655A (en) * | 2003-09-17 | 2005-04-07 | Pentax Corp | Endoscope objective optical system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105361839A (en) * | 2015-11-30 | 2016-03-02 | 青岛大学附属医院 | Endoscope system with improved optical performance |
| CN107085295A (en) * | 2017-06-30 | 2017-08-22 | 江苏鹰利视医疗器械有限公司 | The optical imaging system of endoscope |
| CN107102433A (en) * | 2017-06-30 | 2017-08-29 | 江苏鹰利视医疗器械有限公司 | Hard pipe type endoscopic optical is imaged display system |
| JP2021006899A (en) * | 2019-06-06 | 2021-01-21 | オリンパス ビンテル ウント イーベーエー ゲーエムベーハーＯｌｙｍｐｕｓ Ｗｉｎｔｅｒ ＆ Ｉｂｅ Ｇｅｓｅｌｌｓｃｈａｆｔ Ｍｉｔ Ｂｅｓｃｈｒａｎｋｔｅｒ Ｈａｆｔｕｎｇ | Reversal system for endoscope and endoscope |
| CN111358419A (en) * | 2020-04-18 | 2020-07-03 | 鹰利视医疗科技有限公司 | Rotating image mirror structure of laparoscope |
| WO2022048081A1 (en) * | 2020-09-04 | 2022-03-10 | 鹰利视医疗科技有限公司 | 4k ultra-high-definition laparoscopic relay lens structure |
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Application publication date: 20140806 |