KR20170043714A

KR20170043714A - Portable retinal camera for both mydriasis and non-mydriasis

Info

Publication number: KR20170043714A
Application number: KR1020150142891A
Authority: KR
Inventors: 신인희; 이병일; 박형주
Original assignee: 한국광기술원
Priority date: 2015-10-13
Filing date: 2015-10-13
Publication date: 2017-04-24
Also published as: KR101778129B1

Abstract

The present invention relates to a portable fundus camera which acquires a variety of fundus images, and specifically, to a portable fundus camera which adjusts a light source and which easily and precisely images the condition or lesion of an examined eye. The portable fundus camera of the present invention, in a portable fundus camera which selectively irradiates an examined eye with light, comprises: a light source which generates light; a hole mirror which has different paths for incident light, which is incident from the light source into the examined eye, and reflected light, which is reflected from the examined eye; and a camera which collects the reflected light, which is reflected from the hole mirror, and which images the examined eye. The hole mirror is able to prevent the reflected light from being influenced by optical noise by the incident light, interference, or leaked light, for imaging the examined eye. According to the present invention, the present invention can minimize optical noise, which is generated from the light source, being incident into the camera by using the hole mirror, acquire a high-quality fundus image, make the distribution of the intensity of incident light even by using a proliferator, make the luminous intensity of a whole fundus image uniform, selectively realize a mydriasis or non-mydriasis method through a switch, and have an excellent usability as a diagnosis tool.

Description

{PORTABLE RETINAL CAMERA FOR BOTH MYDRIASIS AND NON-MYDRIASIS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable fundus camera for acquiring various fundus images, and more particularly to a portable fundus camera for easily and accurately capturing a state or lesion of a subject's eye by adjusting a light source.

In general, in order to photograph the eye fundus of the subject, a fundus camera is placed in front of the eye to be examined, the distance between the fundus camera and the cornea, the fundus camera and the apex of the pupil are aligned and then the distance between the eye and the pupil is maintained The retina is observed, the focus on the retina is adjusted, and the fundus, that is, the retina is photographed.

Specifically, the alignment of the cornea and the pupil of the fundus camera and the eye to be examined is performed by irradiating the cornea with a certain shape or angle to the cornea, and capturing the image of the cornea reflected from the cornea. Using the images of the reflected illumination and the images of the cornea, iris, and pupil of the eyeball, the use distance of the fundus camera is adjusted, and the center of the fundus camera and the eyeball are aligned. Further, in the step of photographing the retina, the optical system of the fundus camera is switched to a mode for observing the fundus (retina) in a state in which the use distance of the fundus camera and the eyeball are maintained and the central alignment state is maintained and visible light or infrared And then photographs the retina image.

The fundus camera that photographs the fundus of the subject's eye includes the Shandong fundus camera and the non-fundus fundus camera. Generally, when using the light source of visible light band in acquisition of fundus image, pupillary contraction occurs, so it is referred to as a Shandong fundus camera because artificial shading agent is injected and eye fundus image is acquired. In addition, when an infrared band light source is used to acquire the fundus image, the eye fundus image is acquired without the stimulation of the pupil because the pupil is not stimulated.

Korean Patent Registration No. 10-1321630 (ophthalmologic apparatus) discloses an imaging apparatus that includes a measurement unit for measuring characteristics of an eye of a subject, an imaging optical system for imaging an anterior segment image of the subject's eye, A display control section for displaying function information indicating the function of the operation switch on a screen; a display control section for displaying a state in which the function information is not displayed on the screen in a standard state And a second operation mode in which the function information is displayed on the screen as a standard state.

However, in the conventional art, the incident light incident on the subject and the reflected light reflected from the subject take the same path, and optical noise such as interference or light leakage may occur. In addition, there is a problem in that there is an economic loss due to the use of the color discriminating mirror for each light source path, and the distribution of the light intensity is not uniform, so that a high quality fundus image can not be obtained.

Korean Patent No. 10-1321630 (ophthalmic device)

It is an object of the present invention to obtain a high-quality fundus image by changing the intensity of an incident light source and by changing the paths of incident light and reflected light.

According to an aspect of the present invention, there is provided a portable fundus camera for selectively irradiating light to be examined, comprising: a light source for generating light; A hole mirror for making a path of incident light incident on the subject's eye from a light source different from a path of reflected light reflected from the subject's eye; And a camera for picking up the eye to be examined by collecting the reflected light reflected from the hole mirror, wherein the hole mirror is provided on a horizontal path with the eye to be examined, passes the incident light irradiated to the eye to be examined through a hole in the center part, And the image of the eye to be examined is picked up by the reflection mirror.

Preferably, the light source includes a parabolic condensing mirror so as to reduce the divergence angle of the light, and may be designed to adjust the light amount of light by adjusting the focal distance of the condensing mirror.

Preferably, the light source comprises: a first light source for irradiating visible light in the subject; And a second light source for irradiating infrared rays at different angles from the first light source, wherein the first light source and the second light source can be changed in position using switches.

Preferably, the first light source and the second light source may be composed of at least one of a semiconductor laser (LD), a light emitting diode (LED), and a halogen lamp.

Preferably, the hole mirror includes: a planar-type hole mirror arranged parallel to the incident light incident on the eye to be examined and having an entrance through which an incident light enters into the center portion is wider than an exit, and a cross-section is square; And a cylindrical hole mirror having an inlet at a center portion where incident light is incident is formed wider than an outlet and an inclined surface is formed at an outlet portion so that a cross section of the cylindrical hole mirror is trapezoidal.

The present invention also provides a portable fundus camera for irradiating visible light or infrared light in a subject, comprising: a first light source for irradiating a visible light in a subject; A second light source for irradiating an infrared ray at an angle different from that of the first light source; A color discriminating mirror for selectively transmitting the first light source or the second light source using an optical filter; And a camera for picking up an image of the eye to be examined, wherein the color discriminating mirror selectively irradiates the first light source or the second light source according to the length of the wavelength and changes the path to the eye to be examined, Provides a fundus camera.

Preferably, the color-selection mirror is capable of selectively transmitting the first light source or the second light source through the switch.

A first diffuser disposed between the first light source and the color separating mirror to adjust the light intensity by making the distribution of the first light source uniform; And a second diffuser disposed between the second light source and the color selection mirror to adjust the light intensity by making the distribution of the second light source uniform.

According to the present invention, there is an advantage that a high-quality fundus image can be obtained by minimizing the incidence of optical noise generated from a light source into a camera by using a hole mirror.

Further, the present invention has an advantage that uniformity of the intensity of the entire funduscopic image can be achieved by uniformly distributing the light intensity incident using the diffuser.

In addition, the present invention has an advantage of being highly useful as a diagnostic tool because it can be selectively implemented through a switch.

FIG. 1 is a view of a portable eye fundus camera for Shandong Musan Mountains according to an embodiment of the present invention.
2 is a view of a condensing mirror according to an embodiment of the present invention.
FIG. 3 is a view showing transmission of infrared rays in a color discriminating mirror according to an embodiment of the present invention.
FIG. 4 illustrates the transmission of visible light in a color-separating mirror according to an embodiment of the present invention.
Figure 5 shows a planar aperture mirror and a cylindrical aperture mirror according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the exemplary embodiments. Like reference numerals in the drawings denote members performing substantially the same function.

The objects and effects of the present invention can be understood or clarified naturally by the following description, and the purpose and effect of the present invention are not limited by the following description. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Fig. 1 is a view of a portable eye fundus camera 1 for use in Shandong Musan Mountains according to an embodiment of the present invention. Referring to FIG. 1, the portable angular camera 1 for use with a Shandong diopter can include a light source, a diffuser, a color discriminating mirror 33, a hole mirror 31, a camera 50, and various lenses.

The light source is an element that generates light, and may be formed of at least one of a semiconductor laser (LD), a light emitting diode (LED), and a halogen lamp.

The light source may include a first light source 11 and a second light source 13. The first light source 11 can irradiate visible light to the eye to be examined 51 and the second light source 13 can irradiate infrared rays at a different angle from the first light source 11. [ In the embodiment of the present invention, the first light source 11 and the second light source 13 are represented by an angle of 90 degrees. However, the present invention is not limited to this, but may be designed to have the same path of the incident light 15 have.

The positions of the first light source 11 and the second light source 13 can be changed using switches. The first light source 11 and the second light source 13 may be configured as LEDs as described above and may be configured to change the type of light source by the switch. When the positions of the first light source 11 and the second light source 13 are changed, the transmission wavelength band of the color selection mirror 33 can also be changed so as to selectively enter the first and second light sources 11 and 13.

2 is a view of the condensing mirror 37 according to the embodiment of the present invention. Referring to FIG. 2, the light source may include a condensing mirror 37. The condensing mirror 37 can be formed in the same shape as the concave mirror.

The condensing mirror 37 may be designed to have a parabolic shape so as to reduce the divergence angle of the light, and the light amount of the condensing mirror 37 can be adjusted by adjusting the focal distance of the condensing mirror 37. The condensing mirror 37 may include a light chip, a PCB 371, and a reflector 373.

The optical chip may be composed of at least one of a semiconductor laser (LD), a light emitting diode (LED), and a halogen lamp as the light source. According to an embodiment of the present invention, the optical chip may be a visible ray or an infrared ray, but the present invention is not limited thereto, and a device for generating light to be irradiated to the eye to be examined 51 through the hole mirror 31 may be provided.

The PCB 371 corresponds to a substrate of a general LED chip, and a description thereof will be omitted.

The reflector 373 functions as a mirror used to collect the light emitted from the optical chip into one place, and can be designed in the form of a parabolic reflection surface 375 to collect the light in one focus. The condensing mirror 37 can adjust the amount of light through the adjustment of the focal length of the reflector 373.

The diffuser may transmit the visible light or infrared light generated from the light source and uniformly change the light intensity transmitted to the subject eye 51 with respect to the entire area. According to an embodiment of the present invention, the diffuser may include a first diffuser 71 and a second diffuser 73.

The first diffuser 71 is disposed between the first light source 11 and the color separating mirror 33 to adjust the light intensity by making the distribution of the first light source 11 uniform, Is disposed between the second light source 13 and the color discriminating mirror 33 so as to make the distribution of the second light source 13 uniform, so that the light intensity can be controlled.

The diffuser does not have a uniform distribution in the case of a general light source, and the light intensity is uneven throughout the whole because the specific portion has the highest density because it has a higher density than the other portions. The diffuser may be formed on the front surface of the light source to uniformly distribute the light emitted from the light source, thereby adjusting the light intensity to be constant.

Light having a uniform light intensity passing through the diffuser may pass through the first lens 91 and the second lens 93 and may be incident on the color discriminating mirror 33.

Figs. 3 to 4 show a state in which infrared rays or visible rays are transmitted through the color discriminating mirror 33 according to the embodiment of the present invention. Referring to FIG. 3, the color separating mirror 33 passes through 700 nm in the case of a long wavelength, and cuts off according to FIG.

The color discriminating mirror 33 can selectively transmit the first light source 11 or the second light source 13 using an optical filter. The color discriminating mirror 33 is capable of selectively transmitting light according to the length of the wavelength and changing the path to the eye to be examined 51 and irradiating it.

The color selection mirror 33 may comprise an optical filter. The color selection mirror 33 generally refers to a mirror for separating a light source into three primary colors, and can be fabricated by coating a thin film that reflects a specific wavelength region on a glass as a base. The color discriminating mirror 33 and the optical filter therein can select light for each wavelength region.

The hole mirror 31 can make the paths of the incident light 15 incident on the eye to be examined 51 from the light source and the reflected light 17 reflected from the eye to be examined 51 different. The hole mirror 31 can capture the image of the eye to be examined 51 without causing the reflected light 17 to be affected by optical noise, interference, or crosstalk by the incident light 15. [

The hole mirror 31 can be installed on the path of the eye to be examined 51 and the color discriminating mirror 33 and allows the incident light 15 to be irradiated to the eye to be examined 51 to pass through the hole in the center portion, Can be reflected to the camera 50 through the mirrors on both sides to make the path different.

Figure 5 shows a planar aperture mirror and a cylindrical aperture mirror according to an embodiment of the present invention. Referring to FIG. 5, the hole mirror includes a planar aperture mirror having an entrance whose entrance is parallel to the incident light incident on the eye to be examined and into which incident light is incident, the aperture being wider than the exit and having a square cross section; And a cylindrical hole mirror in which an entrance of a center portion in which incident light is incident is formed wider than an exit portion and an inclined surface is formed at an exit portion and a cross section is trapezoidal.

The conventional planar type hole mirror has a disadvantage in that light transmission is a little difficult when the inclined plane is 45 °. On the other hand, the cylindrical hole mirror can be a little easier to enter or exit the light than the flat mirror.

The light having passed through the first lens 91 and the second lens 93 can be selected through visible light or infrared rays through the above-mentioned color-separating mirror 33, and the selected light is incident on the hole mirror 31. The incident light 15 passes through the third lens 95 and is irradiated on the eye to be examined 51 and the reflected light 17 reflected on the eye to be examined 51 passes through the third lens 95 again and passes through the hole mirror 31, Lt; / RTI >

The hole mirror 31 can reflect the reflected light 17 having passed through the third lens 95 to the fourth lens 97 provided at an angle different from the angle of the incident light 15. The light having passed through the fourth lens 97 is incident on the camera 50 through the reflecting mirror 35.

The camera 50 can pick up the reflected light 17 reflected from the hole mirror 31 and pick up the eye to be examined 51. The camera 50 may be a general CCD (Charge-Coupled Device) camera 50 and may be a digital camera that converts an image into an electric signal using a charge coupled device (CCD) Can be stored in the medium. The camera 50 can measure the subject's eye 51 using the reflected light 17 captured.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. will be. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by all changes or modifications derived from the scope of the appended claims and equivalents of the following claims.

1: Portable fundus camera combined with Shandong Musan Dong
11: first light source 13: second light source
15: incident light 17: reflected light
31: hole mirror 33: color selection mirror
35: reflective mirror 37: condensing mirror
50: camera 51:
71: first diffuser 73: second diffuser
91: first lens 93: second lens
95: third lens 97: fourth lens
371: PCB 373: Reflector
375: Reflecting surface

Claims

1. A portable eye fundus camera for selectively irradiating light to be examined,
A light source for generating the light;
A hole mirror for diffracting the path of the incident light incident on the eye to be examined from the light source and the reflected light reflected from the eye to be examined; And
And a camera for picking up the eye to be examined by collecting reflected light reflected from the hole mirror,
The hole mirror comprises:
And the image of the eye to be examined is picked up by passing the incident light irradiated on the eye to be examined on the horizontal path of the eye to be examined through the hole in the central portion and reflecting the reflected light to the camera through the mirrors on both sides, Handheld portable eye candy camera.

The method according to claim 1,
The light source includes:
And a parabolic condensing mirror for reducing the divergence angle of the light,
And the focal distance of the condensing mirror is adjusted to adjust the light amount of the light.

The method according to claim 1,
The light source includes:
A first light source for irradiating visible light in the subject; And
And a second light source for irradiating infrared light at an angle different from that of the first light source,
Wherein the first light source and the second light source include:
Wherein the position is changed using a switch.

The method of claim 3,
Wherein the first light source and the second light source include:
A portable fundus camera for simultaneous and simultaneous use in Shandong province, characterized by comprising at least one of a semiconductor laser (LD: Laser Diode), a light emitting diode (LED: Light Emitting Diode) and a halogen lamp.

The method according to claim 1,
The hole mirror comprises:
A planar hole mirror arranged parallel to the incident light incident on the eye to be examined and having an inlet through which the incident light is incident on a central portion thereof wider than an outlet and having a rectangular cross section; And
And a cylindrical hole mirror having an entrance at a center portion where the incident light is incident is formed wider than an exit and an inclined surface is formed at the exit portion so that a cross section of the hole is trapezoidal.

1. A portable eye fundus camera for irradiating visible light or infrared light to a subject,
A first light source for irradiating visible light in the subject;
A second light source for emitting infrared rays at an angle different from the first light source;
A color discriminating mirror for selectively transmitting the first light source or the second light source using an optical filter; And
And a camera for capturing the eye to be examined,
Wherein the color-
Wherein the first light source or the second light source is selectively transmitted according to the wavelength, and the path is changed to the eye to be examined to irradiate the light.

The method according to claim 6,
Wherein the color-
Wherein the first light source or the second light source is selectively transmitted through a switch.

The method according to claim 6,
A first diffuser disposed between the first light source and the color separating mirror to adjust the light intensity by making the distribution of the first light source uniform; And
And a second diffuser disposed between the second light source and the color discriminating mirror to adjust the light intensity by making the distribution of the second light source uniform.