CN1194131A - Optical system for objective optometry instrument - Google Patents
Optical system for objective optometry instrument Download PDFInfo
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- CN1194131A CN1194131A CN98107168A CN98107168A CN1194131A CN 1194131 A CN1194131 A CN 1194131A CN 98107168 A CN98107168 A CN 98107168A CN 98107168 A CN98107168 A CN 98107168A CN 1194131 A CN1194131 A CN 1194131A
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- lens
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- spectroscope
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Abstract
The said optical system is one to measure ametropia degree of eyes and it includes projection light path, measuring light path, visual system and measured eye positioning and monitoring system. The projection light path is independent of the measuring light path and this eliminates the parasitic light hoise, which exists in system with common light path. Lowering parasitic light noise makes the said system have precise measuring result as well simple structure and good technological property.
Description
The present invention relates to a kind of optical system of objective optometry instrument, it belongs to the optical system of measuring people's ametropia degree.
Measure at present the ametropic instrument of human eye and be divided into two types of subjective optometry instrument and objective optometry instruments, the subjective optometry instrument needs the tester to observe and differentiates the visual acuity chart symbol in the instrument and talk with optometrist, therefore Measuring Time is long, measuring process is loaded down with trivial details, runs into the changeling or other difficult person just can't measure.For overcoming above-mentioned shortcoming, produced objective optometry instrument, person to person's dialogue has realized the automatization and the intellectuality of measuring process when having avoided measuring.But since the projecting light path in the optical system of this objective optometry instrument with measure light path be regardless of from, most optical element all is shared (claiming with the light path design), the reflect stray light that produces on projecting light path's optical element surface is entered in the measurement light path form the veiling glare noise on the ccd image sensor, reduced the accuracy of measuring.
The purpose of this invention is to provide a kind of optical system that can effectively reduce veiling glare noise, simple in structure, objective optometry instrument that part process is good.
Task of the present invention is to adopt the following technical proposal realization: this optical system comprises projecting light path, measurement light path, solid viewing system and tested eye location monitor system, and projecting light path is respectively independently light path with the measurement light path.
Projecting light path is made up of infrared light supply, condenser lens, aperture, two groups of lens, Huan Guanglan, reflecting mirror and eyepieces, infrared light supply is located at a side of condenser lens, the opposite side of condenser lens is provided with aperture, lens and Huan Guanglan, after Huan Guanglan, be provided with reflecting mirror, be provided with lens and eyepiece after the reflecting mirror.
Above-mentioned infrared light supply is infraluminescence pipe or the small-power iraser pipe with safety assurance.
Above-mentioned ring light hurdle is annulus light hurdle or some ring light hurdle; Width a=(1/8～1/12) Φ of the printing opacity annulus on annulus light hurdle, Φ is footpath in the ring in the formula; Uniform 4 or 6 printing opacity small sircle holes on a middle footpath on ring light hurdle.
The intercept of above-mentioned eyepiece is pre-small post-large, and rear cut-off distance is not less than 75mm, also has enough big work distance with tested eye after guaranteeing to add spectroscope.
Measuring light route ccd image sensor, pick-up lens, eliminate stray light Guang Lan, one group of measurement object lens and one group of lens, spectroscope and reflecting mirror are formed, and are provided with pick-up lens, eliminate stray light light hurdle and lens between ccd image sensor and reflecting mirror in regular turn; Between spectroscope and reflecting mirror, be provided with the measurement object lens; Spectroscope is located at after projecting light path's eyepiece, before the measuring light drive test amount object lens, with two light paths separately so that eliminate the veiling glare noise phenomenon that on ccd image sensor, produces with in the light path design.
Above-mentioned spectroscope is made by the multilayer film vacuum method, and it is 1: 1 to the transmission and the reflectivity of specifying the infrared light supply wavelength.
Gu viewing system is made up of visible light source, solid view, lens and spectroscope, Gu view is located between visible light source and the lens, spectroscope is located at after the lens and between the reflecting mirror and lens of projecting light path.
Above-mentioned solid view can use the method for common landscape photography to make on photochromatic film, and the method for hard sheet of also available colour or picture reprint makes; Must have the attractive eye fixation of a special objective thing at solid view center, to reach the fixedly effect of axis oculi.
Tested eye location monitor system is made up of ccd image sensor, photographic lens, spectroscope and infrared light supply, photographic lens is located between ccd image sensor and the spectroscope, spectroscope is located between the lens and eyepiece of projecting light path, and infrared light supply is located at tested side near the eyes.
Because the present invention has adopted above-mentioned projecting light path and has measured the isolating technical scheme of light path, therefore compares with background technology, has following advantage:
1, reduces the veiling glare noise effectively, guaranteed the accuracy of measurement result;
2, simple in structure, good manufacturability.Because the specification requirement of each optical element surface lining light-transmissive film can be relaxed in the whole system, and also can suitably relax the requirement of signal processing circuit, so native system good manufacturability and simple in structure.
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the structural representation on annulus light hurdle;
Fig. 3 is a structural representation on ring light hurdle;
Fig. 4 is the pre-small post-large goggle structure sketch map of intercept.
As shown in Figure 1, the present invention includes projecting light path's (100 sequence), measure light path (200 sequence), solid viewing system (300 sequence) and tested eye location monitor system (400 sequence), projecting light path's (100 sequence) is respectively independently light path with measurement light path (200 sequence).The infrared light supply 101 that projecting light path's (100 sequence) is made of the infraluminescence pipe, condenser lens 102, aperture 103, two groups of lens 104,107, annulus light hurdle 105, reflecting mirror 106 and eyepieces 108 are formed.Infrared light supply 101 is located at a side of condenser lens 102, and the opposite side of condenser lens 102 is provided with aperture 103, lens 104 and annulus light hurdle 105, is provided with reflecting mirror 106 after annulus light hurdle 105, is provided with lens 107 and eyepiece 108 after the reflecting mirror 106.Measure light path (200 sequence) by ccd image sensor 207, pick-up lens 206, eliminate stray light light hurdle 205, measure object lens 202 for one group, one group of lens 204, spectroscope 201 and reflecting mirror 203 are formed, between ccd image sensor 207 and reflecting mirror 203, be provided with pick-up lens 206 in regular turn, eliminate stray light light hurdle 205 and lens 204, between spectroscope 201 and reflecting mirror 203, be provided with and measure object lens 202, spectroscope 201 is located at after projecting light path's eyepiece 108, before the measuring light drive test amount object lens 202, with two light paths separately, so that eliminate the veiling glare noise phenomenon that on ccd image sensor, produces with in the light path design.Gu solid view 302, lens 303 and spectroscope 304 that viewing system (300 sequence) makes by visible light source 301, with the method for common landscape photography are formed, Gu view 302 is located between visible light source 301 and the lens 303, spectroscope 304 is located at after the lens 303 and between the reflecting mirror 106 and lens 107 of projecting light path.Tested eye location monitor system (400 sequence) is made up of ccd image sensor 404, photographic lens 403, spectroscope 402 and infrared light supply 401.Photographic lens 403 is located between ccd image sensor 404 and the spectroscope 402, and spectroscope 402 is located between the lens 107 and eyepiece 108 of projecting light path, and infrared light supply 401 is located at tested eye 109 all sides.
Operation principle of the present invention is: the light that infrared light supply 101 sends converges at aperture 103 (A through condenser lens 102
1) locate, aperture 103 is positioned on the focal plane of lens 104, forms annular target through lens 104 and ring light hurdle 105, converges at A through reflecting mirror 106, lens 107 again
2The place.A
2Being the back focus of lens 107, also is the front focus of eyepiece 108, again through eyepiece 108 parallel injecting in the tested eye 109.If tested eye 109 is normal eye, annular target imaging is at retina A
3On, from optical fundus A
3The light that reflects penetrates pupil arrival spectroscope 201 and is folded to measurement object lens 202, through reflecting mirror 203, lens 204 and eliminate stray light light hurdle 205, pick-up lens 206, forms a certain size and encircle as A clearly on ccd image sensor 207
4(see A among Fig. 1
4-a figure), prove that tested eye 109 is normal.If there is ametropia (myopia or hypermetropia) in human eye, the ring on the ccd image sensor 207 changes as size and is unintelligible, and then the scanning device of being made up of device in the frame of broken lines carries out scan compensation, and annular target is still clearly imaged on the retina.When demarcated ring picture (A on the ccd image sensor 207 with normal eye (normally using the OD simulated eye)
4Behind-a) the diameter, measure improperly at the moment as long as obtain identical with it big circlet picture on ccd image sensor 207, the displacement of scanning device is with regard to the number of degrees of corresponding tested eye hypermetropia or myopia so, by Newton's formula: xx '=-f '
2
Get x/D=-f '
2D=-x/f '
2
In the formula: f ' is the focal length of eyepiece,
X is an eyepiece object space defocusing amount for the scanning device displacement,
X ' is an eyepiece picture side defocusing amount,
D is a tested eye ametropia concave-sphere value (hypermetropia or myopia).
If there is astigmatism in tested eye, on ccd image sensor 207, having obtained becoming the ring picture of shape---ellipse (is seen A among Fig. 1
4-b figure), by scanner scans this oval major and minor axis is equated respectively with the circular diameter of normal eye calibration value, the difference of twice scanning device displacement is with regard to the astigmatism value of corresponding tested eye, the ametropic concave-sphere value of the corresponding tested eye of one displacement wherein, the astigmatism shaft angle can pass through date processing, and the fitted ellipse curve obtains.
The operation principle of tested eye location monitor system is as follows: eye before the tested eye 109 (going up lower eyelid, cornea and pupil position) B
2By infrared light 401 (wavelength is different from infrared light 101) irradiation, eye imaging before 403 pairs of tested eye of photographic lens, eye imaging (B on ccd image sensor 404 before making
3) clear, and make tested oculopupillary picture B
3The point-like circle B that presets on-C and the display monitor central monitoring system
3-d is concentric, guarantees the optical axis of pupil center by optical system, so just can guarantee that tested eye accurately locatees, and reduces measurement error.
Above-mentioned infrared light supply 101 also optional usefulness except that can selecting the infraluminescence pipe for use has the small-power iraser pipe of safety assurance.When selecting small-power iraser pipe for use, must be in (under the intrabeam viewing condition) under the service condition of strictness, according to laser-induced ocular injury threshold value and radiation limit value, accurately calculate the safety value of laser tube power, and the laser power that should use accurate laser power meter monitoring to enter human eye.The infrared wavelength range of infrared light supply 101 is near infrared band (between 800 μ m～1000 μ m).
As Fig. 2, shown in Figure 3, ring light hurdle is annulus light hurdle or some ring light hurdle.The parameter of footpath and ring width is subjected to the restriction of characteristic of size, optical system amplification, resolution and the ccd image sensor element of human eye pupil in the annulus on ring light hurdle, so the parameter that the present invention adopts is as follows: arrive footpath φ=2.8 ± 0.2mm in the annulus at tested eye place; Width a=(1/8～1/12) Φ of printing opacity annulus 1.Uniform the small sircle hole 2 of 4 printing opacities on a middle footpath on ring light hurdle.The middle footpath of some ring and the diameter of printing opacity small sircle hole 2 can be determined by the principle on annulus light hurdle.The photoetching manufactured can be used in above-mentioned ring light hurdle, also can use other method manufacturing.Also can be uniform on the middle footpath on some ring light hurdle the small sircle hole 2 of 6 printing opacities.
As shown in Figure 4, eyepiece 108 of the present invention is a kind of asymmetric structures, and the intercept of this eyepiece 108 is pre-small post-large, and rear cut-off distance is not less than 75mm, also has enough big work distance with tested eye after guaranteeing to add spectroscope.F, F ' are eyepiece 108 forward and backward focuses among the figure; H, H ' are eyepiece 108 forward and backward interareas;-f, f ' are eyepiece 108 forward and backward focal lengths;-L
F, L '
FBe eyepiece 108 forward and backward intercepts.
Gu the solid view 302 in the viewing system both can use the method for common landscape photography to make on photochromatic film, the method for hard sheet of also available colour or picture reprint makes; Must have the attractive eye fixation of a special objective thing at solid view center, to reach the fixedly effect of axis oculi.Gu view 302 forms a colored view target under the illumination of visible light source 301, its effect is to allow people's eye fixation, is used for fixing the optical axis of human eye, make the optical axis coincidence of the optical axis and optical system, it to lens 303 should have+1～+ positive bias of 2D, the guiding tested eye is loosened, and improves certainty of measurement.
Claims (10)
1, a kind of optical system of objective optometry instrument is characterized in that: this optical system comprises projecting light path, measurement light path, solid viewing system and tested eye location monitor system, and projecting light path is respectively independently light path with the measurement light path.
2, the optical system of objective optometry instrument according to claim 1, it is characterized in that: described projecting light path is made up of infrared light supply, condenser lens, aperture, two groups of lens, Huan Guanglan, reflecting mirror and eyepieces, infrared light supply is located at a side of condenser lens, the opposite side of condenser lens is provided with aperture, lens and Huan Guanglan, after Huan Guanglan, be provided with reflecting mirror, be provided with lens and eyepiece after the reflecting mirror.
3, the optical system of objective optometry instrument according to claim 2 is characterized in that: described infrared light supply is infraluminescence pipe or the small-power iraser pipe with safety assurance.
4, the optical system of objective optometry instrument according to claim 2 is characterized in that: described ring light hurdle is annulus light hurdle or some ring light hurdle; Width a=(1/8～1/12) Φ of the printing opacity annulus on annulus light hurdle, Φ is footpath in the ring in the formula; Uniform 4 or 6 printing opacity small sircle holes on a middle footpath on ring light hurdle.
5, the optical system of objective optometry instrument according to claim 2 is characterized in that: the intercept of described eyepiece is pre-small post-large, and rear cut-off distance is not less than 75mm, also has enough big work distance with tested eye after guaranteeing to add spectroscope.
6, the optical system of objective optometry instrument according to claim 1, it is characterized in that: described measuring light route ccd image sensor, pick-up lens, eliminate stray light Guang Lan, one group of measurement object lens and one group of lens, spectroscope and reflecting mirror are formed, and are provided with pick-up lens, eliminate stray light light hurdle and lens between ccd image sensor and reflecting mirror in regular turn; Between spectroscope and reflecting mirror, be provided with the measurement object lens; Spectroscope is located at after projecting light path's eyepiece, before the measuring light drive test amount object lens, with two light paths separately so that eliminate the veiling glare noise phenomenon that on ccd image sensor, produces with in the light path design.
7, the optical system of objective optometry instrument according to claim 6 is characterized in that: described spectroscope is made by the multilayer film vacuum method, and it is 1: 1 to the transmission and the reflectivity of specifying the infrared light supply wavelength.
8, the optical system of objective optometry instrument according to claim 1, it is characterized in that: described solid viewing system is made up of visible light source, solid view, lens and spectroscope, Gu view is located between visible light source and the lens, spectroscope is located at after the lens and between the reflecting mirror and lens of projecting light path.
9, the optical system of objective optometry instrument according to claim 8 is characterized in that: described solid view can use the method for common landscape photography to make on photochromatic film, and the method for hard sheet of also available colour or picture reprint makes; Must have the attractive eye fixation of a special objective thing at solid view center, to reach the fixedly effect of axis oculi.
10, the optical system of objective optometry instrument according to claim 1, it is characterized in that: described tested eye location monitor system is made up of ccd image sensor, photographic lens, spectroscope and infrared light supply, photographic lens is located between ccd image sensor and the spectroscope, spectroscope is located between the lens and eyepiece of projecting light path, and infrared light supply is located at tested side near the eyes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98107168 CN1055205C (en) | 1998-03-30 | 1998-03-30 | Optical system for objective optometry instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98107168 CN1055205C (en) | 1998-03-30 | 1998-03-30 | Optical system for objective optometry instrument |
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| Publication Number | Publication Date |
|---|---|
| CN1194131A true CN1194131A (en) | 1998-09-30 |
| CN1055205C CN1055205C (en) | 2000-08-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98107168 Expired - Fee Related CN1055205C (en) | 1998-03-30 | 1998-03-30 | Optical system for objective optometry instrument |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100391398C (en) * | 2001-08-12 | 2008-06-04 | 想象之眼公司 | Device for measuring aberrations in an eye-type system |
| CN100431480C (en) * | 2003-06-30 | 2008-11-12 | 株式会社来易特制作所 | Ocular refractive power measuring instrument |
| 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 |
| CN102843956A (en) * | 2010-02-01 | 2012-12-26 | 雷萨公司 | Placido ring measurement of astigmatism axis and laser marking of astigmatism axis |
| CN103040433A (en) * | 2011-10-14 | 2013-04-17 | 上海美沃精密仪器有限公司 | Tilt-shift tomography eye scanning system and method thereof |
| CN104027067A (en) * | 2014-05-29 | 2014-09-10 | 温州眼视光发展有限公司 | Human eye front tissue coaxial imaging, fixation and lighting system |
| CN104905763A (en) * | 2015-06-18 | 2015-09-16 | 苏州四海通仪器有限公司 | Optometry device capable of measuring paracentral defocus |
| US9267229B2 (en) | 2006-03-31 | 2016-02-23 | Lg Electronics Inc. | Dryer and method for controlling the same |
| CN106419829A (en) * | 2016-08-30 | 2017-02-22 | 宁波法里奥光学科技发展有限公司 | Optical system of full-automatic optometry unit and automatic detecting and positioning method of optical system |
| WO2021031538A1 (en) * | 2019-08-22 | 2021-02-25 | 长兴爱之瞳医疗科技有限公司 | Subjective and objective integrated precise optometry device, and optometry method |
-
1998
- 1998-03-30 CN CN 98107168 patent/CN1055205C/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100391398C (en) * | 2001-08-12 | 2008-06-04 | 想象之眼公司 | Device for measuring aberrations in an eye-type system |
| CN100431480C (en) * | 2003-06-30 | 2008-11-12 | 株式会社来易特制作所 | Ocular refractive power measuring instrument |
| US9267229B2 (en) | 2006-03-31 | 2016-02-23 | Lg Electronics Inc. | Dryer and method for controlling the same |
| 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 |
| CN102843956A (en) * | 2010-02-01 | 2012-12-26 | 雷萨公司 | Placido ring measurement of astigmatism axis and laser marking of astigmatism axis |
| CN103040433A (en) * | 2011-10-14 | 2013-04-17 | 上海美沃精密仪器有限公司 | Tilt-shift tomography eye scanning system and method thereof |
| CN104027067A (en) * | 2014-05-29 | 2014-09-10 | 温州眼视光发展有限公司 | Human eye front tissue coaxial imaging, fixation and lighting system |
| CN104905763A (en) * | 2015-06-18 | 2015-09-16 | 苏州四海通仪器有限公司 | Optometry device capable of measuring paracentral defocus |
| WO2016202312A1 (en) * | 2015-06-18 | 2016-12-22 | 苏州四海通仪器有限公司 | Para-central defocusing measuring optometry apparatus |
| US10478062B2 (en) | 2015-06-18 | 2019-11-19 | Suzhou Seehitech Equipments Co., Ltd | Optometry apparatus capable of measuring para-central defocus |
| CN106419829A (en) * | 2016-08-30 | 2017-02-22 | 宁波法里奥光学科技发展有限公司 | Optical system of full-automatic optometry unit and automatic detecting and positioning method of optical system |
| CN106419829B (en) * | 2016-08-30 | 2018-07-31 | 宁波法里奥光学科技发展有限公司 | A kind of optical system and its automatic detecting-positioning method of full-automatic optometry unit |
| WO2021031538A1 (en) * | 2019-08-22 | 2021-02-25 | 长兴爱之瞳医疗科技有限公司 | Subjective and objective integrated precise optometry device, and optometry method |
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| Publication number | Publication date |
|---|---|
| CN1055205C (en) | 2000-08-09 |
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