CN104116494B - Keratometry device based on telecentric system - Google Patents
Keratometry device based on telecentric system Download PDFInfo
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- CN104116494B CN104116494B CN201410412172.XA CN201410412172A CN104116494B CN 104116494 B CN104116494 B CN 104116494B CN 201410412172 A CN201410412172 A CN 201410412172A CN 104116494 B CN104116494 B CN 104116494B
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Abstract
The present invention relates to a kind of keratometry device based on telecentric system, it is made up of objective apparatus, luminous point collimator apparatus, scoring ring illuminator, scoring ring device, supervision beam divider device, monitoring system device and base plate, and objective apparatus includes that object lens fix seat, lens barrel and object lens；Luminous point collimator apparatus includes luminous point collimation lens barrel, light source circuit board, light emitting diode, diffusion sheet, aperture and collimating lens；Scoring ring illuminator includes scoring ring lighting circuit plate and at least three illumination light-emitting diode；Scoring ring device includes scoring ring hold-down support, scoring ring and scoring ring screening glass；Monitor that beam divider device includes monitoring beam divider seat and monitoring beam divider；Described monitoring system device includes monitoring hold-down support, monitoring lens barrel, supervision lens and diaphragm pressure cylinder.The present invention substantially increases automatic refractor focusing speed and the certainty of measurement of corneal curvature.
Description
Technical field
The invention belongs to automatic refractor, be specifically related to keratometry device based on telecentric system.
Background technology
Keratometry precision prescribed is the highest, the optical frames group that current keratometry device generally uses can be more visible eye cornea is carried out imaging, by different curvature cornea to illumination annulus catoptric imaging size and the calculating of variation of image grayscale thereof, can easily realize horizontal x direction and the focusing in vertical y direction, but in the focusing along optical axis z direction above, due to the image quality near optics focal plane, image sharpnesses etc. are more or less the same, thus it is difficulty with the z-axis focusing of degree of precision, thus cause cornea doughnut as the minor variations of size, and then the corneal curvature value making to calculate is the most accurate.
Summary of the invention
The present invention is aiming at current keratometry device time eye cornea is carried out imaging, owing to being difficulty with the z-axis focusing of degree of precision ground, and cause the accurate not problem of corneal curvature value obtained, and propose a kind of keratometry device based on telecentric system.
The technical solution used in the present invention: keratometry device based on telecentric system, it is made up of, wherein objective apparatus, luminous point collimator apparatus, scoring ring illuminator, scoring ring device, supervision beam divider device, monitoring system device and base plate
Described objective apparatus includes that object lens fix seat, lens barrel and object lens, and described object lens are fixed seat and are fixed on described base plate, and described lens barrel is fixed on described object lens and fixes on seat, and described object lens are fixed in lens barrel by wire ring；
Described luminous point collimator apparatus is provided with two about lens barrel centrosymmetry, it includes luminous point collimation lens barrel, light source circuit board, light emitting diode, diffusion sheet, aperture and collimating lens, described luminous point collimation lens barrel is fixed on described lens barrel, described diffusion sheet, aperture, light emitting diode and light source circuit board fit the most successively be fixed on luminous point collimation lens barrel centre bore in one end, described collimating lens be fixed on luminous point collimation lens barrel the other end；
Described scoring ring illuminator includes that scoring ring lighting circuit plate and at least three illumination light-emitting diode, described scoring ring lighting circuit plate are fixed on described base plate, and described at least three illumination light-emitting diode is circumferentially distributed on around the centre bore of scoring ring lighting circuit plate；
Described scoring ring device includes scoring ring hold-down support; scoring ring and scoring ring screening glass; described scoring ring hold-down support is fixed on described base plate; described scoring ring screening glass is fixed on central through hole one end of scoring ring hold-down support; described scoring ring is fitted in scoring ring screening glass side; wherein be provided with on scoring ring two about centrosymmetric two circular holes in scoring ring hole, its hole heart is in the range of the projection of described luminous point collimation lens barrel centre bore；
Described supervision beam divider device includes monitoring beam divider seat and monitoring beam divider, described supervision beam divider seat is fixed on described base plate, described supervision beam divider is fixed in supervision beam divider seat with the horizontal 45 angles, monitors that beam divider is in the range of the projection of described object lens；
Described monitoring system device includes monitoring hold-down support, monitoring lens barrel, supervision lens and diaphragm pressure cylinder, described supervision hold-down support is fixed on described base plate, the diaphragm pressure cylinder that described supervision lens are set with by monitoring lens barrel centre bore one end is pressed on it other end monitoring lens barrel centre bore, diaphragm pressure cylinder is fixed by screws in supervision lens barrel, monitoring that lens barrel is fixed by screws in supervision hold-down support, the hot spot that wherein object lens shine is by being incident upon after monitoring beam divider on supervision lens.
Described luminous point collimator apparatus tilts certain angle, and after two luminous point collimator apparatuses inclinations, the joint of its centrage is located at the eyeball central authorities in scoring ring device centre bore front.
Further, the right side of described supervision beam divider device is provided with reflector apparatus, described reflector apparatus includes mirror unit and reflecting mirror, mirror unit is fixed on described base plate, reflecting mirror becomes inverted " v " with the horizontal 45 angles and with described supervision beam divider, described monitoring system device is arranged on below reflector apparatus, and the hot spot being reflected mirror reflection can project on the supervision lens in supervision lens barrel.
Compared with prior art it provides the benefit that the present invention: when 1. same eye cornea is measured by the present invention, when automatic refractor movable supervision eyeball focusing, the difference that the diameter of circumferential dispersion hot spot produced according to this device and the line line segment length of a pair hot spot change, the real focal plane position of eye cornea can be found fast and accurately, it is achieved thereby that accurately focusing along optical axis z direction, it is ensured that certainty of measurement；2. when the present invention measures in the case of accurately z direction does not focuses, according to ring-shaped light spot diameter now and the ratio of the line line segment length of a pair hot spot, the corneal curvature now calculated is modified, obtain the identical value of corneal curvature when focusing with z direction, substantially increase automatic refractor focusing speed；3. the present invention improves the certainty of measurement of corneal curvature；4. the present invention is that full-automatic eye refractometer realizes automatic tracking system and provides sufficient condition.
Accompanying drawing explanation
Fig. 1 is the side view of present configuration；
Fig. 2 is the sectional view in Fig. 1 along A-A hatching, is also the structural representation of embodiments of the invention one；
Fig. 3 is the sectional view in Fig. 1 along A-A hatching, is also the structural representation of embodiments of the invention two；
Fig. 4 is the structural representation of objective apparatus；
Fig. 5 is the structural representation of luminous point collimator apparatus；
Fig. 6 is the structural representation of scoring ring device；
Fig. 7 is the structural representation monitoring beam divider device；
Fig. 8 is the structural representation of monitoring system device；
Fig. 9 is the structural representation of reflector apparatus in embodiment two.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings.
Embodiment 1
A kind of keratometry device based on telecentric system, such as Fig. 2, it is by objective apparatus 1, luminous point collimator apparatus 2, scoring ring illuminator 3, scoring ring device 4, monitor beam divider device 5, monitoring system device 6 and base plate 36 form, when starting to measure, people's eyeball is positioned at the emergent pupil of full-automatic eye refractometer, i.e. it is positioned at scoring ring device 4 centre bore front, wherein, such as Fig. 4, objective apparatus 1 includes that seat 7 fixed by object lens, lens barrel 8 and object lens 9, object lens 9 are fixed seat 7 and are fixed on base plate 36, lens barrel 8 is fixed on object lens by screw 10 and fixes on seat 7, object lens 9 are fixed in lens barrel 8 by pressure cylinder；nullSuch as Fig. 5，Luminous point collimator apparatus 2 is provided with two about lens barrel 8 centrosymmetry，And luminous point collimator apparatus 2 tilts 10 degree，After two luminous point collimator apparatuses 2 inclinations, the joint of its centrage is located at the eyeball central authorities in scoring ring device 4 centre bore front，It includes that luminous point collimates lens barrel 12、Light source circuit board 13、Light emitting diode 14、Diffusion sheet 15、Aperture 16 and collimating lens 17，Wherein the middle part of luminous point collimation lens barrel 12 is the central through hole that a mid diameter little two ends diameter is big，Described central through hole left side is a tapered ramp，It is easy to fit with scoring ring 22，Described central through hole right-hand member cylindrical is provided with the plate on the band inclined-plane of a projection，Wherein said tapered ramp is parallel with the inclined-plane of the plate on the band inclined-plane of described projection，Luminous point collimation lens barrel 12 is screwed on lens barrel 8 by the plate on the band inclined-plane of described projection on luminous point collimation lens barrel 12，Diffusion sheet 15、Aperture 16、Light emitting diode 14 and light source circuit board 13 are fixed on inside the central through hole right-hand member described in luminous point collimation lens barrel 12 with glue laminating the most successively，Collimating lens 17 glue is fixed on inside the central through hole right-hand member described in luminous point collimation lens barrel 12；Such as Fig. 2, scoring ring illuminator 3 includes scoring ring lighting circuit plate 19 and 8 illumination light-emitting diodes 20, and scoring ring lighting circuit plate 19 is fixed on base plate 36, around 8 the most uniform centre bores being welded on scoring ring lighting circuit plate 19 of illumination light-emitting diode 20；Such as Fig. 6; scoring ring device 4 includes scoring ring hold-down support 21; scoring ring 22 and scoring ring screening glass 23; scoring ring hold-down support 21 is fixed on base plate 36; scoring ring screening glass 23 is fixed on the central through hole left end of scoring ring hold-down support 21; scoring ring is fitted on the right side of scoring ring screening glass 23, be wherein provided with on scoring ring 22 two about centrosymmetric two circular holes in scoring ring 22 hole, its hole heart is in the range of the projection of luminous point collimation lens barrel 12 centre bore；Such as Fig. 7, monitor that beam divider device 5 includes monitoring beam divider seat 25 and monitoring beam divider 26, monitor that beam divider seat 25 is screwed on base plate 36, monitor that beam divider 26 is fixed in supervision beam divider seat 25 with the horizontal 45 angle glue, monitor that beam divider 26 is in the range of the projection of object lens 9；Such as Fig. 8, monitoring system device 6 is fixed on the right side of supervision beam divider device 5, it includes monitoring hold-down support 27, monitor lens barrel 28, monitor lens 29 and diaphragm pressure cylinder 30, the left end center of diaphragm pressure cylinder 30 is offered porose, monitor that hold-down support 27 screw is fixed on base plate 36, monitor that it is pressed on the right-hand member monitoring lens barrel 28 centre bore to lens 29 by the diaphragm pressure cylinder 30 of supervision lens barrel 28 centre bore left end suit, diaphragm pressure cylinder 30 is fixed by screws in supervision lens barrel 28, monitor that lens barrel 28 is fixed by screws in supervision hold-down support 27, the hot spot that wherein object lens 9 shine is by being incident upon on supervision lens 29 by diaphragm pressure cylinder 30 after monitoring beam divider 26, consequently facilitating measure.
Embodiment 2
A kind of keratometry device based on telecentric system, such as Fig. 3, it is by objective apparatus 1, luminous point collimator apparatus 2, scoring ring illuminator 3, scoring ring device 4, monitor beam divider device 5, reflector apparatus 33, monitoring system device 6 and base plate 36 form, when starting to measure, people's eyeball is positioned at the emergent pupil of full-automatic eye refractometer, i.e. it is positioned at scoring ring device 4 centre bore front, wherein, such as Fig. 4, objective apparatus 1 includes that seat 7 fixed by object lens, lens barrel 8 and object lens 9, object lens 9 are fixed seat 7 and are fixed on base plate 36, lens barrel 8 is fixed on object lens by screw 10 and fixes on seat 7, object lens 9 are fixed in lens barrel 8 by wire ring；nullSuch as Fig. 5，Luminous point collimator apparatus 2 is provided with two about lens barrel 8 centrosymmetry，And luminous point collimator apparatus 2 tilts 10 degree，After two luminous point collimator apparatuses 2 inclinations, the joint of its centrage is located at the eyeball central authorities in scoring ring device 4 centre bore front，It includes that luminous point collimates lens barrel 12、Light source circuit board 13、Light emitting diode 14、Diffusion sheet 15、Aperture 16 and collimating lens 17，Wherein the middle part of luminous point collimation lens barrel 12 is the central through hole that a mid diameter little two ends diameter is big，Described central through hole left side is a tapered ramp，It is easy to fit with scoring ring 22，Described central through hole right-hand member cylindrical is provided with the plate on the band inclined-plane of a projection，Wherein said tapered ramp is parallel with the inclined-plane of the plate on the band inclined-plane of described projection，Luminous point collimation lens barrel 12 is screwed on lens barrel 8 by the plate on the band inclined-plane of described projection on luminous point collimation lens barrel 12，Diffusion sheet 15、Aperture 16、Light emitting diode 14 and light source circuit board 13 are fixed on inside the central through hole right-hand member described in luminous point collimation lens barrel 12 with glue laminating the most successively，Collimating lens 17 glue is fixed on inside the central through hole right-hand member described in luminous point collimation lens barrel 12；Such as Fig. 3, scoring ring illuminator 3 includes scoring ring lighting circuit plate 19 and 6 illumination light-emitting diodes 20, and scoring ring lighting circuit plate 19 is fixed on base plate 36, around 6 the most uniform centre bores being welded on scoring ring lighting circuit plate 19 of illumination light-emitting diode 20；Such as Fig. 6; scoring ring device 4 includes scoring ring hold-down support 21; scoring ring 22 and scoring ring screening glass 23; scoring ring hold-down support 21 is fixed on base plate 36; scoring ring screening glass 23 is fixed on the central through hole left end of scoring ring hold-down support 21; scoring ring is fitted on the right side of scoring ring screening glass 23, be wherein provided with on scoring ring 22 two about centrosymmetric two circular holes in scoring ring 22 hole, its hole heart is in the range of the projection of luminous point collimation lens barrel 12 centre bore；Such as Fig. 7, monitor that beam divider device 5 includes monitoring beam divider seat 25 and monitoring beam divider 26, monitor that beam divider seat 25 is screwed on base plate 36, monitor that beam divider 26 is fixed in supervision beam divider seat 25 with the horizontal 45 angle glue, monitor that beam divider 26 is in the range of the projection of object lens 9；Monitor that the right side of beam divider device 5 is provided with reflector apparatus 33, such as Fig. 9, reflector apparatus 33 includes mirror unit 35 and reflecting mirror 34, mirror unit 35 screw is fixed on base plate 36, reflecting mirror 34 becomes inverted " v " with the horizontal 45 angles and with supervision beam divider 26, and the hot spot being reflected mirror 34 reflection can project on the supervision lens 29 in supervision lens barrel 28.Such as Fig. 8, monitoring system device 6 is fixed on immediately below reflector apparatus 33, including monitoring hold-down support 27, monitor lens barrel 28, monitor lens 29 and diaphragm pressure cylinder 30, the left end center of diaphragm pressure cylinder 30 is offered porose, monitor that hold-down support 27 screw is fixed on base plate 36, monitor that it is pressed on the right-hand member monitoring lens barrel 28 centre bore to lens 29 by the diaphragm pressure cylinder 30 of supervision lens barrel 28 centre bore left end suit, diaphragm pressure cylinder 30 is fixed by screws in supervision lens barrel 28, monitor that lens barrel 28 is fixed by screws in supervision hold-down support 27, the hot spot that wherein object lens 9 shine is by monitoring being reflected through diaphragm pressure cylinder 30 and can be incident upon on supervision lens 29 through reflecting mirror 34 after beam divider 26, consequently facilitating measure.
Operation principle: when automatic refractor carries out corneal curvature detection, parallel light spots after circumferential dispersion light source illuminates annulus sighting target and pair of alignment is simultaneously irradiated on eye cornea, through corneal reflex, telecentric optic group collects corneal reflex light, imaging on the CCD of focal plane, the corneal reflex image that CCD obtains is an annulus and a pair smooth speckle, when same eye cornea is measured, when being moved before and after keratometry device, the line line segment length of the diameter of annulus and a pair smooth speckle changes difference, compared with a pair hot spot line line segment length by circle diameter size, correctly find the real focal plane position of eye cornea, accurately calculate corneal curvature parameter.
Claims (3)
1. keratometry device based on telecentric system, it by objective apparatus, luminous point collimator apparatus, scoring ring illuminator, scoring ring device, monitor that beam divider device, monitoring system device and base plate form, it is characterized in that:
Described objective apparatus includes that object lens fix seat, lens barrel and object lens, and described object lens are fixed seat and are fixed on described base plate, and described lens barrel is fixed on described object lens and fixes on seat, and described object lens are fixed in lens barrel by wire ring；
Described luminous point collimator apparatus is provided with two about lens barrel centrosymmetry, it includes luminous point collimation lens barrel, light source circuit board, light emitting diode, diffusion sheet, aperture and collimating lens, described luminous point collimation lens barrel is fixed on described lens barrel, described diffusion sheet, aperture, light emitting diode and light source circuit board fit the most successively be fixed on luminous point collimation lens barrel centre bore in one end, described collimating lens be fixed on luminous point collimation lens barrel the other end；
Described scoring ring illuminator includes that scoring ring lighting circuit plate and at least three illumination light-emitting diode, described scoring ring lighting circuit plate are fixed on described base plate, and described at least three illumination light-emitting diode is circumferentially distributed on around the centre bore of scoring ring lighting circuit plate；
Described scoring ring device includes scoring ring hold-down support; scoring ring and scoring ring screening glass; described scoring ring hold-down support is fixed on described base plate; described scoring ring screening glass is fixed on central through hole one end of scoring ring hold-down support; described scoring ring is fitted in scoring ring screening glass side; wherein be provided with on scoring ring two about centrosymmetric two circular holes in scoring ring hole, its hole heart is in the range of the projection of described luminous point collimation lens barrel centre bore；
Described supervision beam divider device includes monitoring beam divider seat and monitoring beam divider, described supervision beam divider seat is fixed on described base plate, described supervision beam divider is fixed in supervision beam divider seat with the horizontal 45 angles, monitors that beam divider is in the range of the projection of described object lens；
Described monitoring system device includes monitoring hold-down support, monitoring lens barrel, supervision lens and diaphragm pressure cylinder, described supervision hold-down support is fixed on described base plate, the diaphragm pressure cylinder that described supervision lens are set with by monitoring lens barrel centre bore one end is pressed on it other end monitoring lens barrel centre bore, diaphragm pressure cylinder is fixed by screws in supervision lens barrel, monitoring that lens barrel is fixed by screws in supervision hold-down support, the hot spot that wherein object lens shine is by being incident upon after monitoring beam divider on supervision lens.
Keratometry device based on telecentric system the most according to claim 1, it is characterized in that: described luminous point collimator apparatus tilts certain angle, and after two luminous point collimator apparatuses inclinations, the joint of its centrage is located at the eyeball central authorities in front, center, scoring ring hole.
Keratometry device based on telecentric system the most according to claim 1 and 2, it is characterized in that: the right side of described supervision beam divider device is provided with reflector apparatus, described reflector apparatus includes mirror unit and reflecting mirror, mirror unit is fixed on described base plate, reflecting mirror becomes inverted " v " with the horizontal 45 angles and with described supervision beam divider, described monitoring system device is arranged on below reflector apparatus, and the hot spot being reflected mirror reflection can project on the supervision lens in supervision lens barrel.
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| CN201410412172.XA CN104116494B (en) | 2014-08-21 | 2014-08-21 | Keratometry device based on telecentric system |
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| CN201410412172.XA CN104116494B (en) | 2014-08-21 | 2014-08-21 | Keratometry device based on telecentric system |
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| CN104921698B (en) * | 2015-07-13 | 2016-08-24 | 中北大学 | A kind of method revising corneal curvature instrument system astigmatism |
| CN109222887A (en) * | 2018-08-30 | 2019-01-18 | 上海理工大学 | A kind of portable hand-held cornea curvimeter based on object space telecentric beam path |
| CN110887452B (en) * | 2019-12-05 | 2021-03-23 | 中国人民解放军国防科技大学 | Method for measuring surface inclination angle of target position of curved surface object |
| CN115067872B (en) * | 2022-08-18 | 2022-11-29 | 上海佰翊医疗科技有限公司 | Eye parameter evaluation device |
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| US5500697A (en) * | 1993-07-30 | 1996-03-19 | Nidek Co., Ltd. | Ophthalmic apparatus for measuring refractive characteristic of eye to be measured |
| JP4769923B2 (en) * | 1998-12-10 | 2011-09-07 | カール ツァイス メディテック アクチエンゲゼルシャフト | Integrated device for non-contact measurement of the axial length of the eye and / or the curvature of the cornea and / or the depth of the anterior chamber, suitable for the calculation of intraocular lenses |
| CN101416870B (en) * | 2008-09-24 | 2012-10-10 | 太原中北新缘科技中心 | Light-spot alignment device of monitoring center |
| KR101056960B1 (en) * | 2008-11-25 | 2011-08-16 | 주식회사 휴비츠 | Corneal curvature measuring method to compensate for measurement position error and optometry using the same |
| CN102499632A (en) * | 2012-01-05 | 2012-06-20 | 沈激 | Ocular anterior segment detection and illumination system |
| CN102715886B (en) * | 2012-06-21 | 2014-08-06 | 宁波明星科技发展有限公司 | Corneal curvature calculation method for computerized refractometer |
| CN103340596B (en) * | 2013-07-20 | 2014-08-06 | 太原中北新缘科技中心 | Device and method for measuring corneal curvature |
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Address after: 030051 No. 0301 and 0402, building 1, No. 19, Chuangye street, Taiyuan Xuefu Park, comprehensive reform demonstration zone, Taiyuan City, Shanxi Province Patentee after: Taiyuan Zhongbei Xinyuan Technology Center (Co.,Ltd.) Address before: 030051 photoelectric factory of Zhongbei University, No. 3 Xueyuan Road, Jiancaoping District, Taiyuan City, Shanxi Province Patentee before: TAIYUAN XINYUAN HIGH TECH CENTER NORTH University OF CHINA |