CN104083145A - Fundus camera - Google Patents
Fundus camera Download PDFInfo
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- CN104083145A CN104083145A CN201410336663.0A CN201410336663A CN104083145A CN 104083145 A CN104083145 A CN 104083145A CN 201410336663 A CN201410336663 A CN 201410336663A CN 104083145 A CN104083145 A CN 104083145A
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Abstract
The invention relates to an ophthalmic optical instrument, in particular to a fundus camera. The fundus camera comprises a photographing light path and an illumination light path. The photographing light path is composed of an eye lens, a first diaphragm, a photographic field lens, an image sensor and a polarization detection element, wherein the eye lens, the first diaphragm, the photographic field lens and the image sensor are sequentially arranged, and the polarization detection element is arranged at the portion, between the eye lens and the image sensor, of the photographing light path. The illumination light path comprises an eye lens and a light source, wherein the eye lens and the light source are sequentially arranged, and a polarizing element is arranged at the portion, between the eye lens and the light source, of the illumination light path. The included angle formed between the polarization direction of the polarization detection element and the polarization direction of the polarizing element is 90 degrees. According to the fundus camera, due to the facts that the illumination light path and the photographing light path are provided with the polarizing element and the polarization detection element respectively, and the included angle formed between the polarization directions is 90 degrees, the polarization detection element can completely block stray light reflected from the cornea and the eye lenses of an illumination system, no stray light will reach the image sensor, and the stray light is completely eliminated. According to the fundus camera, the number of optical elements is small, the structure is simple, and the fundus camera can be held by hand.
Description
Technical field
The present invention relates to a kind of opticianry instrument, particularly a kind of fundus camera.
Background technology
Human eye (as retina) pathological manifestations is not only relevant with the disease of eyes own, and also have certain associated with health some other diseases (as diabetes), the patient of diabetes, often there is in early days retinopathy, by then optical fundus retinography is analyzed it, can find early eyes and some other diseases of health, for very large first chance has been won in the treatment of disease.Retina is checked, need to be to the optical fundus imaging of taking pictures, so fundus camera become the important instrument that ophthalmology carries out dynamic retinoscopy, is the important tool of ophthalmology diagnosis.Fundus camera is also the important instrument of internal medicine department of endocrinology early diagnosis diabetes in addition.
Fundus camera must have an illumination path to emit beam the optical fundus of throwing light on.But the light that light source sends is some relevant optical glasss and tested cornea reflex time in fundus camera, can produce the light of being returned by these optical surface reflection rays, these light that reflect tend to enter on the photosurface of light path of photography arrival photo-sensitive cell, cause serious veiling glare, or title " false image ", affect image quality, disturb the diagnosis of doctor to disease.The problem of veiling glare or " false image " is one of key technology in fundus camera developmental research always.
The fundus camera in past adopts the way that ring light hurdle, stain plate and hollow illuminator are set conventionally, can only eliminate the primary event of above-mentioned optical surface, generally can not eliminate secondary reflection or multiple reflections, that is to say and can not thoroughly eliminate veiling glare or " false image ".
In addition, in the light path of existing fundus camera, optical element is more, and complex structure is difficult to miniaturization to be applicable to making hand-held fundus camera.
Summary of the invention
The object of the invention is to provide in order to overcome the deficiencies in the prior art a kind of and can thoroughly eliminate veiling glare, can not cause photo center to occur shadow, and simple in structure, be applicable to making the fundus camera of hand-held.
To achieve these goals, the invention discloses a kind of fundus camera, comprise light path of photography and illumination path, it is characterized in that: described light path of photography by set gradually eyeglass, the first smooth hurdle, photographic objective and imageing sensor and be arranged on eyeglass and imageing sensor between inspection polarizer in light path form, described illumination path comprises eyeglass and the light source setting gradually, in the eyeglass of described illumination path and the light path between light source, be provided with polarizing element, the polarization direction of described inspection polarizer and polarizing element differs 90 °.
Compared with prior art, the present invention is owing to being provided with polarizing element in illumination path, in light path of photography, be provided with inspection polarizer simultaneously, the polarization direction of simultaneously examining polarizer and polarizing element differs 90 ° of settings, the light reflecting when the light process eyeglass that send from illuminator like this and cornea just becomes line polarized light, when the polarization direction of the inspection polarizer in being arranged on light path of photography is vertical with it, the veiling glare that inspection polarizer just can reflect these stops completely, can not arrive imageing sensor, thereby thoroughly eliminated veiling glare.And optical element is few, simple in structure, be applicable to making the fundus camera of hand-held.
As the further setting of the present invention, inspection polarizer in described light path of photography is arranged between eyeglass and imageing sensor, described illumination path is by the eyeglass that set gradually, polarizing element, the first condenser lens, the second smooth hurdle, second condenser lens and light source form, described polarizing element and inspection polarizer form by sharing a polarization splitting prism, described illumination path overlaps with light path of photography after described polarization splitting prism reflection, described illumination path, the eyeglass of light path of photography share, described the second smooth hurdle images on cornea through second condenser lens and eyeglass.Above-mentioned setting, because described polarizing element and inspection polarizer consist of described polarization splitting prism, simplifies the structure, and is conducive to miniaturization, is more suitable for making hand-held fundus camera.
As of the present invention, further arrange again, the described analyzing beam splitter that shakes is arranged between eyeglass and imageing sensor, described illumination path is comprised of the eyeglass that set gradually, polarizing element and light source, and described light source images on the pupil edge of tested eye through eyeglass.Wherein said polarizer can be in polarization splitting prism, polaroid or crystal polarizer any form.Above-mentioned setting, photography and illumination path are simple in structure equally, are conducive to miniaturization, are more suitable for making hand-held fundus camera.
As of the present invention, further arrange, described photographic objective is comprised of monolithic or multi-disc lens, wherein can contain a slice or above non-spherical lens, to simplify structure, and optimal imaging quality.
As of the present invention, further arrange, described light source is LED lamp again.Selecting LED lamp is light source, and volume is little, brightness is higher, the life-span is long.
As of the present invention, further arrange, described imageing sensor can be CCD photo-sensitive cell or CMOS photo-sensitive cell again.
Below in conjunction with drawings and the specific embodiments, the invention will be further described.
Accompanying drawing explanation
Accompanying drawing 1 is the specific embodiment of the invention 1 light path system schematic diagram;
Accompanying drawing 2 is the specific embodiment of the invention 2 light path system schematic diagrams.
The specific embodiment
Fundus camera of the present invention comprises light path of photography and illumination path, it is characterized in that: described light path of photography by set gradually eyeglass, the first smooth hurdle, photographic objective and imageing sensor and be arranged on eyeglass and imageing sensor between inspection polarizer in light path form, described illumination path comprises eyeglass and the light source setting gradually, in the eyeglass of described illumination path and the light path between light source, be provided with polarizing element, the polarization direction of described inspection polarizer and polarizing element differs 90 °.Further embodiment is exemplified below:
Specific embodiment 1
Fundus camera comprises casing, mechano-electronic parts (not shown), light path of photography and illumination path, and described light path of photography and illumination path are as shown in Figure 1.Described light path of photography forms by setting gradually the smooth hurdle 3 of eyeglass 1, first, photographic objective 4 and imageing sensor 5 and examining polarizer 2, inspection polarizer 2 can be arranged on the optional position between eyeglass 1 and imageing sensor 5, in this specific embodiment, inspection polarizer 2 is arranged between eyeglass 1 and the first smooth hurdle 3, described imageing sensor 5 can be CCD photo-sensitive cell or CMOS photo-sensitive cell, and described inspection polarizer 2 consists of polarization splitting prism.Described illumination path is comprised of the eyeglass 1 that set gradually, polarizing element 10, the first smooth hurdle 7 of condenser lens 6, second, second condenser lens 8 and light source 9, the light that described light source 9 sends overlaps with light path of photography after described polarization splitting prism reflection, the eyeglass 1 of described illumination path, light path of photography share, and described the second smooth hurdle 7 images on cornea through second condenser lens 8 and eyeglass 1.Described polarizing element 10 and inspection polarizer 2 consist of same polarization splitting prism, the forward part optical axis of described illumination path preferably intersects with light path of photography and intersects in polarization splitting prism place, the polarization direction of described inspection polarizer 2 and polarizing element 10 differs 90 ° of settings, reflects the line polarized light becoming and the polarization direction that is arranged on the inspection polarizer 2 light path of photography perpendicular and be blocked while making the light that sends from illuminator through eyeglass 1 and cornea.
Described photographic objective 4 can be comprised of monolithic or multi-disc lens, wherein can contain a slice or above non-spherical lens; The light source 9 of fundus camera of the present invention can have multiple choices, and as Halogen light, small-sized small electric bulb or LED lamp, preferably LED lamp is conducive to miniaturization as light source 9, and is applicable to making hand-held fundus camera, and light source 9 can be the LED lamp of one or more colors.
Specific embodiment 2
Fundus camera comprises casing mechano-electronic parts (not shown), light path of photography and illumination path, and described light path of photography and illumination path are as shown in Figure 2.Described light path of photography forms by setting gradually the smooth hurdle 3 of eyeglass 1, first, photographic objective 4 and imageing sensor 5 and examining polarizer 2, inspection polarizer 2 can be arranged on the optional position between eyeglass 1 and imageing sensor 5, in this specific embodiment, inspection polarizer 2 is arranged between eyeglass 1 and the first smooth hurdle 3, and described imageing sensor 5 can be CCD photo-sensitive cell or CMOS photo-sensitive cell.Described illumination path is comprised of the eyeglass 1 that set gradually, polarizing element 10 and light source 9, and described light source 9 images in through eyeglass 1 on the pupil edge of tested eye, to avoid strongly reflective near the corneal vertex at pupil center place.The polarization direction of described inspection polarizer 2 and polarizing element 10 differs 90 ° of settings, while making the light that sends from illuminator through eyeglass 1 and cornea, reflect the line polarized light becoming and the polarization direction that is arranged on the analyser plate light path of photography perpendicular and be blocked, described inspection polarizer 2 and polarizing element 10 can adopt polaroid, and polarization splitting prism or crystal polarizer form.
The same with specific embodiment 1, described photographic objective 4 can be comprised of monolithic or multi-disc lens, wherein can contain a slice or above non-spherical lens; The light source 9 of fundus camera is for can there be multiple choices, and as Halogen light, small-sized small electric bulb or LED lamp, preferably LED lamp is conducive to miniaturization as light source 9, and is applicable to making hand-held fundus camera, and light source 9 can be the LED lamp of one or more colors.
Claims (7)
1. a fundus camera, comprise light path of photography and illumination path, it is characterized in that: described light path of photography by set gradually eyeglass, the first smooth hurdle, photographic objective and imageing sensor and be arranged on eyeglass and imageing sensor between inspection polarizer in light path form, described illumination path comprises eyeglass and the light source setting gradually, in the eyeglass of described illumination path and the light path between light source, be provided with polarizing element, the polarization direction of described inspection polarizer and polarizing element differs 90 °.
2. fundus camera according to claim 1, it is characterized in that: the inspection polarizer in described light path of photography is arranged between eyeglass and imageing sensor, described illumination path is by the eyeglass that set gradually, polarizing element, the first condenser lens, the second smooth hurdle, second condenser lens and light source form, described polarizing element and inspection polarizer form by sharing a polarization splitting prism, described illumination path overlaps with light path of photography after described polarization splitting prism reflection, described illumination path, the eyeglass of light path of photography share, described the second smooth hurdle images on cornea through second condenser lens and eyeglass.
3. fundus camera according to claim 1, it is characterized in that: described inspection polarizer is arranged between eyeglass and imageing sensor, described illumination path is comprised of the eyeglass that set gradually, polarizing element and light source, and described light source images on the pupil edge of tested eye through eyeglass.
4. according to the fundus camera described in claims 1 to 3, it is characterized in that: any in polarization splitting prism, polaroid or crystal polarizer of described polarizer forms.
5. according to the fundus camera described in claims 1 to 3 any one, it is characterized in that: the LED lamp that described light source is one or more colors.
6. according to the fundus camera described in claims 1 to 3 any one, it is characterized in that: described photographic objective is comprised of monolithic or multi-disc lens, wherein can contain a slice or above non-spherical lens.
7. according to the fundus camera described in claims 1 to 3 any one, it is characterized in that: described imageing sensor is CCD photo-sensitive cell or CMOS photo-sensitive cell.
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| CN201410336663.0A CN104083145A (en) | 2014-07-15 | 2014-07-15 | Fundus camera |
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| CN201410336663.0A CN104083145A (en) | 2014-07-15 | 2014-07-15 | Fundus camera |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105411524A (en) * | 2015-12-07 | 2016-03-23 | 温州医科大学眼视光器械有限公司 | Pupil detection device |
| CN106618477A (en) * | 2016-12-30 | 2017-05-10 | 上海美沃精密仪器股份有限公司 | Portable non-mydriatic fundus imaging device |
| CN107007250A (en) * | 2017-05-31 | 2017-08-04 | 广东工业大学 | A kind of fundus imaging optical system |
| CN107028588A (en) * | 2016-02-04 | 2017-08-11 | 慈济学校财团法人慈济大学 | Optical detection apparatus and its system |
| CN108324242A (en) * | 2017-12-28 | 2018-07-27 | 东北大学 | A kind of multispectral fundus imaging device and method based on intelligent terminal |
| CN108433699A (en) * | 2018-06-07 | 2018-08-24 | 杭州瞳创医疗科技有限公司 | A kind of eyes eye-ground photography machine equipment |
| CN111035358A (en) * | 2019-12-28 | 2020-04-21 | 重庆贝奥新视野医疗设备有限公司 | Stray light eliminating system of fundus camera and working method thereof |
| WO2020088113A1 (en) * | 2018-11-02 | 2020-05-07 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Depth camera systems |
| CN112472022A (en) * | 2020-12-10 | 2021-03-12 | 上海雄博精密仪器股份有限公司 | Optical structure of hand-held fundus camera |
| CN112869703A (en) * | 2019-12-01 | 2021-06-01 | 深圳硅基智能科技有限公司 | Optical system of fundus camera and fundus camera |
| CN117204805A (en) * | 2023-07-05 | 2023-12-12 | 李抄 | Objective analysis optical system for analyzing visual quality |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105411524A (en) * | 2015-12-07 | 2016-03-23 | 温州医科大学眼视光器械有限公司 | Pupil detection device |
| CN107028588B (en) * | 2016-02-04 | 2019-03-22 | 慈济学校财团法人慈济大学 | Optical detection apparatus and its system |
| CN107028588A (en) * | 2016-02-04 | 2017-08-11 | 慈济学校财团法人慈济大学 | Optical detection apparatus and its system |
| CN106618477A (en) * | 2016-12-30 | 2017-05-10 | 上海美沃精密仪器股份有限公司 | Portable non-mydriatic fundus imaging device |
| CN107007250B (en) * | 2017-05-31 | 2018-11-30 | 广东工业大学 | A kind of fundus imaging optical system |
| CN107007250A (en) * | 2017-05-31 | 2017-08-04 | 广东工业大学 | A kind of fundus imaging optical system |
| CN108324242A (en) * | 2017-12-28 | 2018-07-27 | 东北大学 | A kind of multispectral fundus imaging device and method based on intelligent terminal |
| CN108433699A (en) * | 2018-06-07 | 2018-08-24 | 杭州瞳创医疗科技有限公司 | A kind of eyes eye-ground photography machine equipment |
| WO2020088113A1 (en) * | 2018-11-02 | 2020-05-07 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Depth camera systems |
| US11893756B2 (en) | 2018-11-02 | 2024-02-06 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Depth camera device |
| CN112869703A (en) * | 2019-12-01 | 2021-06-01 | 深圳硅基智能科技有限公司 | Optical system of fundus camera and fundus camera |
| CN111035358A (en) * | 2019-12-28 | 2020-04-21 | 重庆贝奥新视野医疗设备有限公司 | Stray light eliminating system of fundus camera and working method thereof |
| CN111035358B (en) * | 2019-12-28 | 2022-03-11 | 重庆贝奥新视野医疗设备有限公司 | Stray light eliminating system of fundus camera and working method thereof |
| CN112472022A (en) * | 2020-12-10 | 2021-03-12 | 上海雄博精密仪器股份有限公司 | Optical structure of hand-held fundus camera |
| CN117204805A (en) * | 2023-07-05 | 2023-12-12 | 李抄 | Objective analysis optical system for analyzing visual quality |
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Application publication date: 20141008 |