CN109044246A - A kind of endoscopic optical system - Google Patents

A kind of endoscopic optical system Download PDF

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Publication number
CN109044246A
CN109044246A CN201811097485.5A CN201811097485A CN109044246A CN 109044246 A CN109044246 A CN 109044246A CN 201811097485 A CN201811097485 A CN 201811097485A CN 109044246 A CN109044246 A CN 109044246A
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CN
China
Prior art keywords
group
focal length
lens
optical system
following conditions
Prior art date
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Pending
Application number
CN201811097485.5A
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Chinese (zh)
Inventor
陈新华
赵知诚
罗宗平
杨惠林
沈为民
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Suzhou University
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Suzhou University
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Publication date
Application filed by Suzhou University filed Critical Suzhou University
Priority to CN201811097485.5A priority Critical patent/CN109044246A/en
Publication of CN109044246A publication Critical patent/CN109044246A/en
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00131—Accessories for endoscopes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00163—Optical arrangements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below

Abstract

The present invention relates to a kind of endoscopic imaging systems of medical use, and miniature planar array detector can be cooperated to use, and obtain high resolution video image；To solve visual field in the prior art and the not high technical problem of resolution ratio, using a kind of endoscopic optical system, including front group and rear group, described preceding group towards object and focal power is negative, the collection for incident beam；Group has positive light coke after described, for outgoing beam to be converged to image planes；Wide visual field high-resolution based endoscopic imaging is realized, while cooperating deflecting prism that can also realize that oblique visual field is imaged；Also based endoscopic imaging design only can be realized with two kinds of glass materials, reduce processing cost.

Description

A kind of endoscopic optical system
Technical field
The present invention relates to a kind of endoscopic imaging systems of medical use, and miniature planar array detector can be cooperated to use, and obtain high score Resolution video image.
Background technique
In medical consultations, in order to accurately arrive at lesion, reduce the damage to patient, it is desirable that in biopsy or Positioning accuracy with higher when operation.Compared with the auxiliary positionings means such as X-ray or ultrasonic wave, medical endoscope has user Just, the advantages that intuitive and positioning accuracy is high, has become one of the important means of clinical treatment.By means of endoscope, doctor Life can observe lesion by eyepiece, can also obtain video image by planar array detector.With detector technology Development, the pixel dimension of detector is smaller and smaller, it is desirable that endoscope optical system has higher resolution ratio.While in order to make Obtain doctor has the sufficiently large visual field in operation, it is desirable that endoscope optical system has wider visual field.
Using non-spherical element, the performance of endoscope optical system can be effectively improved, but there is at high cost, difficulty of processing The disadvantages of big.In order to which system cost and manufacture difficulty is effectively reduced, it is desirable in wide visual field high-resolution endoscope optical system Spherical optics element is used as far as possible.CN104305951 " thin footpath wide-angle medical electronic endoscope optical imaging system " proposes to use 6 Piece aspherical elements realize that 100 ° of field angles, spatial resolution reach 100lp/mm.6 kinds of glass materials have been used in design result. CN103370646B " endoscope optical system and endoscope " proposes a variety of designs, double glued saturating using 3 simple lenses and 1 Mirror realizes big visual field based endoscopic imaging.4 kinds of glass materials have been used in design result.
Summary of the invention
The present invention be solve visual field in the prior art and the not high technical problem of resolution ratio, the technical solution adopted is as follows:
A kind of endoscopic optical system, including front group and rear group, described preceding group towards object and focal power is negative, be used for into The collection of irradiating light beam；Group has positive light coke after described, for outgoing beam to be converged to image planes；If whole system focal length is F, preceding group of focal length are fBefore, rear focal length of organizing is fAfterwards, then optical system meets the following conditions: -1.7 < fBefore/ f < -1.75 and 1.5 < fAfterwards/f< 1.6, wherein the fBefore/ f is preceding group of focal length fBeforeWith whole system focal length f ratio, fAfterwards/ f organizes focal length f after beingBeforeWith whole system coke Away from f ratio.
Group is the plano-concave lens with negative power before described, and plane is towards object space, concave curvature radius R1Meet The following conditions: 0.55mm < R1<0.65mm.Meet the angle that conditions above can be effectively compressed outgoing beam, and front surface is flat Face, easy to process and assembly.
Group successively includes the first lens with positive light coke, second with positive light coke from the object side to the image side after described Lens, the third lens with positive light coke and the 4th lens with negative power, the focal length of the first lens meet following item Part: 1.8mm < f1The focal length of < 2mm, the second lens meet the following conditions: 3mm < f2< 3.2mm, the focal length of the third lens meet following Condition: 2mm < f3< 2.2mm, the focal length of the 4th lens meet the following conditions: -0.9mm < f4<-1.2mm.Meet conditions above, it can Effectively to correct system aberration, reach the image quality close to diffraction limit.
It include two kinds of glass materials in above scheme endoscopic optical system.
In many applications, endoscope optical system needs are mounted in the steel pipe with inclined surface, are required at this time Endoscopic optical system has certain viewing directional angle.By the way that deflecting prism is added between front group and rear group, may be implemented this kind of to incline Tiltedly imaging endoscopic optical system.
Detailed description of the invention
Fig. 1 is endoscopic optical system schematic；
Fig. 2 is the endoscopic optical system diagram of embodiment 1；
Fig. 3 is the point range figure of embodiment 1；
Fig. 4 is the modulation transfer function curve of embodiment 1；
Fig. 5 is the distortion curve of embodiment 1；
Fig. 6 is the endoscopic optical system diagram of the embodiment of the present invention 2.
Wherein: group before 1-, group after 2-, 11- plano-concave lens, the first lens of 21-, the second lens of 22-, 23- the third lens, The 4th lens of 24-, 3- detector window, 4- image planes, 5- deflecting prism.
Specific embodiment
In order to illustrate more clearly of invention, it is further described with reference to the accompanying drawings and embodiments:
Embodiment one:
A kind of endoscopic optical system for the collection of incident beam, and is compressed as shown in Figure 1, preceding group 1 towards object The angle of incident beam, so that the angle of emergence of light beam is effectively compressed after preceding group 1, rear group 2 is used for the convergence of light beam At the image planes 4 of detector window 3, the rear corrections to system aberration simultaneously of group 2, so as to obtain clearly image include preceding group and Group afterwards；Described preceding group towards object and focal power is negative, the collection for incident beam；Group has positive light coke after described, For outgoing beam to be converged to image planes；If whole system focal length is f, preceding group of focal length is fBefore, rear focal length of organizing is fAfterwards, then optics System meets the following conditions: -1.7 < fBefore/ f < -1.75 and 1.5 < fAfterwards/ f < 1.6, wherein the fBefore/ f is preceding group of focal length fBeforeWith it is entire System focal length f ratio, fAfterwards/ f organizes focal length f after beingBeforeWith whole system focal length f ratio.
The endoscopic optical system of specific embodiment 1 as shown in Fig. 2, be followed successively by plano-concave lens 11, from the object side to the image side One lens 21, the second lens 22, the third lens 23 and the 4th lens 24, detector window 3 and image planes 4.The optical system Service band is 0.4-0.7um, F/# 4.37, focal length 0.6726mm, and full filed angle is 90 °.The ginseng of lens in whole system Number is as shown in table 1.
The lens parameter table of 1 embodiment 1 of table
Front surface radius of curvature (mm) Rear surface radius of curvature (mm) Thickness (mm) Material
Plano-concave lens 11 Inf 0.6 0.25 HK9L
First lens 21 1.566 -2.32 0.3321 HK9L
Second lens 22 2.52 -2.7 0.3105 HK9L
The third lens 23 2.445 -1.445 0.3785 HZF7
4th lens 24 -1.083 3.704 0.1675 HK9L
Fig. 3 is the asterism figure of embodiment 1, it is seen that the optical system is about 1.414um in the asterism geometric dimension of 0 visual field, It is about 1.17um in the asterism geometric dimension of 0.5 visual field, the asterism geometric dimension in 0.7 field range is about 1.412um, The asterism geometric dimension of 1 visual field is about 1.164um, and each visual field asterism size is respectively less than Aili spot size.
Fig. 4 is the modulation transfer function curve of embodiment 1, and specific transfer function values are as shown in table 2.
The modulating transfer function value of 2 embodiment 1 of table
Fig. 5 is the distortion curve of embodiment 1, and the system is there are certain distortion known in figure, this is in endoscopic system In be relatively common.The maximum distortion of embodiment 1 appears in peripheral field, about 26.7%.By the methods of image procossing, Distortion when imaging can be corrected.
Embodiment two:
A kind of inclination imaging endoscopic optical system, including preceding group, deflecting prism and rear group, the focal power organized before described are Negative, for the collection of wide visual field incident beam, the deflecting prism is used for the deflection of incident beam, and organizing after described has positive light focus Degree, for the outgoing beam of deflecting prism group to be converged to image planes, the deflecting prism successively includes two reflections from object space Face, the chief ray incidence angles θ 1 of the first reflecting surface meet the following conditions: 1 < 47 ° of 24 ° < θ；The chief ray of its second reflecting surface enters Firing angle θ 2 meets the following conditions: 2 < 67 ° of 43 ° < θ.Fig. 6 is the optical system diagram of embodiment 2, and compared with Example 1, preceding group with after It joined deflecting prism 5 between group.The Y-axis inclination angle of first reflecting surface of deflecting prism is 35.5 °, and the Y-axis of the second reflecting surface is inclined Angle is 55 °, and the viewing directional angle of the system is 45 °.
Since the use of the technical program realizes wide visual field high-resolution based endoscopic imaging, while deflecting prism being cooperated may be used also To realize that oblique visual field is imaged.The technical program also only can realize based endoscopic imaging design with two kinds of glass materials, reduce processing Cost.

Claims (5)

1. a kind of endoscopic optical system, including front group and rear group, described preceding group towards object and focal power is negative；Group after described With positive light coke, for outgoing beam to be converged to image planes；Optical system meets the following conditions: -1.7 < fBefore/f<-1.75 And 1.5 < fAfterwards/ f < 1.6, wherein the f is that system focal length is, fBeforeFor preceding group of focal length, fAfterwardsFor rear group of focal length, fBefore/ f is preceding group of focal length fBeforeWith whole system focal length f ratio, fAfterwards/ f organizes focal length f after beingBeforeWith whole system focal length f ratio.
2. endoscopic optical system according to claim 1, it is characterised in that: preceding group is the plano-concave lens with negative power, Its plane is towards object space, concave curvature radius R1Meet the following conditions: 0.55mm < R1<0.65mm。
3. endoscopic optical system according to claim 1, it is characterised in that: group is from the object side to the image side successively comprising tool after described There are the first lens of positive light coke, the second lens with positive light coke, the third lens with positive light coke and there is negative light 4th lens of focal power, the focal length f of the first lens1Meet the following conditions: 1.8mm < f1< 2mm, the focal length f of the second lens2Meet The following conditions: 3mm < f2< 3.2mm, the focal length f of the third lens3Meet the following conditions: 2mm < f3< 2.2mm, the focal length of the 4th lens f4Meet the following conditions: -0.9mm < f4<-1.2mm。
4. endoscopic optical system according to claim 3, it is characterised in that: include two kinds of glass in the endoscopic optical system Material.
5. endoscopic optical system, including preceding group, deflecting prism and rear group is imaged in a kind of inclination, the focal power organized before described is Negative, the deflecting prism is used for the deflection of incident beam, it is described after group there is positive light coke, for by the outgoing of deflecting prism group Light beam converges in image planes, and the deflecting prism successively includes two reflectings surface, the master of the first reflecting surface from the object side to the image side Angle of incidence of light θ 1 meets the following conditions: 1 < 47 ° of 24 ° < θ；The chief ray incidence angles θ 2 of its second reflecting surface meets the following conditions: 43°<θ2<67°。
CN201811097485.5A 2018-09-19 2018-09-19 A kind of endoscopic optical system Pending CN109044246A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112790721A (en) * 2021-01-29 2021-05-14 之江实验室 High-resolution lateral imaging miniature endoscopic microscope objective set and probe

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101021606A (en) * 2006-02-14 2007-08-22 富士能株式会社 Objective lens for endoscope
US20090237807A1 (en) * 2008-03-18 2009-09-24 Olympus Medical Systems Corp. Objective lens for endoscope
CN102338924A (en) * 2011-10-18 2012-02-01 杭州首天光电技术有限公司 Wide-angle object lens of electronic endoscope
CN105403992A (en) * 2015-12-28 2016-03-16 天津市融和机电科技有限公司 Hard tube endoscope object lens and manufacturing method thereof
CN107874733A (en) * 2017-12-04 2018-04-06 中山市众盈光学有限公司 A kind of small-bore endoscope optical system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101021606A (en) * 2006-02-14 2007-08-22 富士能株式会社 Objective lens for endoscope
US20090237807A1 (en) * 2008-03-18 2009-09-24 Olympus Medical Systems Corp. Objective lens for endoscope
CN102338924A (en) * 2011-10-18 2012-02-01 杭州首天光电技术有限公司 Wide-angle object lens of electronic endoscope
CN105403992A (en) * 2015-12-28 2016-03-16 天津市融和机电科技有限公司 Hard tube endoscope object lens and manufacturing method thereof
CN107874733A (en) * 2017-12-04 2018-04-06 中山市众盈光学有限公司 A kind of small-bore endoscope optical system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112790721A (en) * 2021-01-29 2021-05-14 之江实验室 High-resolution lateral imaging miniature endoscopic microscope objective set and probe
CN112790721B (en) * 2021-01-29 2023-07-18 之江实验室 High-resolution lateral imaging miniature endoscopic microscope objective group and probe

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Application publication date: 20181221

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