JPH10179522A - Ophthalmic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high quality eye image of even when a photographic light source is deteriorated. SOLUTION: This device has an illumination optical system 1A with an illumination light source 1 and a photographing light source 3 for irradiating illumination light and photographing light to an examined eye E, an observation photographing optical system 1B kept faced to an examined E eye for photographing the image thereof on the basis of light reflected from the eye E, a illumination light quantity detection means 2A for detecting the light quantity of the illumination light from the illumination light source 1, a reflected light quantity detection means 2B for detecting the quantity of light reflected from the observation photographing optical system 1B and a light emission control part 41 for controlling the emission of light from the photographing light source 1 of the illumination optical system 1A. Also, the light emission control part 41 controls the emission of light from the photographing light source 3 on the basis of each quantity of the illumination light and reflected light detected through the illumination light quantity detection means 2A and the reflected light quantity detection means 2B. Furthermore, the quantity of light emitted from the photographing light source 3 is detected with the illumination light quantity detection means 2A, thereby controlling the re-emission of light with the light emission control part on the basis of the detected light quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ophthalmologic apparatus such as a fundus camera for obtaining a fundus image of an eye to be examined.

[0002]

2. Description of the Related Art A conventional fundus camera has an illumination optical system having an illumination light source such as a halogen lamp and a photographing light source such as a xenon lamp for irradiating illumination light and photographing light to an eye to be examined. An observation and imaging optical system for taking an image of the eye to be examined based on the reflected light from the eye to be examined opposing the optometry, an illumination light amount detecting means for detecting the amount of illumination light from the illumination light source, and an observation and imaging optical system A reflected light amount detecting means for detecting the amount of reflected light of the system, and the light amount of the photographing light source is set based on the respective light amounts of the illumination light and the reflected light detected by the illumination light amount detecting means and the reflected light amount detecting means. The light emission of the photographing light source is controlled by the light emission control means according to the set light emission amount, and the fundus image is photographed by the observation photographing optical system.

[0003]

However, in the case of the above-mentioned conventional fundus camera, at present, no measures are taken against the deterioration of the photographing light source composed of a xenon lamp. However, there may be a case where the light amount is not actually emitted as set, and there is a problem that a good-quality fundus image cannot be obtained and a deterioration of the imaging light source cannot be determined.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can provide a good-quality eye image even when the imaging light source has deteriorated, and can easily determine the deterioration of the imaging light source. An object of the present invention is to provide an ophthalmic apparatus.

[0005]

According to a first aspect of the present invention, there is provided an ophthalmologic apparatus having an illumination light source and a photographing light source, and an illumination optical system for irradiating an eye to be examined with illumination light and photographing light; An observation and imaging optical system for taking an image of the eye to be examined based on the reflected light from the eye to be examined opposing the optometry, an illumination light amount detecting means for detecting the amount of illumination light from the illumination light source, and an observation and imaging optical system Reflected light amount detecting means for detecting the amount of reflected light of the system,
Light emission control means for controlling light emission of a photographing light source of the illumination optical system, wherein the light emission control means performs photographing based on the respective light amounts of the illumination light and the reflected light detected by the illumination light quantity detection means and the reflected light quantity detection means. In addition to performing light emission control of the light source, the light emission amount from the photographing light source is detected by the illumination light amount detection means, and re-emission control is performed by the light emission control means according to the detected light amount. is there.

According to the first aspect of the present invention, the light emission control means controls the light emission of the photographing light source based on the respective amounts of the illumination light and the reflected light detected by the illumination light quantity detection means and the reflected light quantity detection means. And the amount of light emitted from the photographing light source is detected by the illumination light amount detecting means, and re-emission control is performed by the light emission control means according to the detected light amount. The amount of emitted light can be controlled so that the eye to be inspected is irradiated with sufficient illumination light from the imaging light source, and an image of the eye can be obtained with high quality.

According to a second aspect of the present invention, there is provided an ophthalmologic apparatus having an illumination light source and a photographing light source. The illumination optical system irradiates illumination light and photographing light to an eye to be inspected. An observing and photographing optical system for photographing an image of the subject's eye based on the reflected light from the examinee's eye, an illumination light amount detecting means for detecting the amount of illumination light from the illumination light source, and the amount of reflected light of the observing and photographing optical system A reflected light amount detecting means for detecting the light emitting amount of the photographing light source, a light emitting amount setting means for setting the light emitting amount of the photographing light source, and a light emitting control means for controlling the light emitting of the photographing light source of the illumination optical system based on the set value of the light emitting amount setting means. Alarm means for taking in a value detected by the illumination light amount detection means of the light emission amount from the imaging light source controlled by the light emission control means, and outputting alarm information when the detected value is insufficient for the set light emission amount. Features .

[0008] According to the ophthalmologic apparatus according to the second aspect of the present invention, the detection value of the amount of light emitted from the photographing light source controlled by the light emission control unit is detected by the illumination light amount detection unit, and the detected light amount is set. Is provided with an alarming means for outputting alarm information when it is insufficient. Therefore, it is possible to determine the deterioration of the imaging light source by outputting the alarm information.

According to a third aspect of the present invention, in the ophthalmologic apparatus according to the first or second aspect of the present invention, the illumination light amount detecting means and the reflected light amount detecting means include a light passing through an illumination optical system and an observation light. A pair of reflecting members for reflecting a part of the light passing through the imaging optical system, a pair of optical fibers for guiding each light reflected by the pair of reflecting members, and a single light receiving the light guided by the pair of optical fibers And an element.

According to the ophthalmologic apparatus according to the third aspect of the present invention, the configuration of the illumination light amount detecting means and the reflected light amount detecting means can be simplified by the above structure.

According to a fourth aspect of the present invention, in the ophthalmologic apparatus according to the third aspect of the present invention, the reflection member of the reflected light amount detecting means can be inserted into and removed from the optical path of the observation and photographing optical system. It is composed.

According to the ophthalmologic apparatus of the present invention, the reflecting member of the reflected light amount detecting means is configured to be insertable into and removable from the optical path of the observation and photographing optical system. When irradiating the illumination light for imaging, the reflecting member is instantaneously inserted into the optical path of the observation / imaging optical system and immediately separated therefrom, so that the obstacle to the imaging of the eye to be inspected can be eliminated.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fundus camera as an ophthalmologic apparatus according to an embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, reference numeral 1 denotes an illumination observation light source made of a halogen lamp. The illumination light emitted from the illumination observation light source 1 passes through a relay lens 2 to form an image. An imaging light source 3 composed of a xenon lamp is provided at the position. A relay lens 4 is arranged in the direction of the optical path from the image forming position. Observation light passing through the relay lens 4 reaches a ring-shaped aperture stop 5, and observation illumination light passing through the ring-shaped aperture stop 5 is reflected. The light is reflected by the mirror 6, guided to the objective lens 9 by the perforated mirror 8 via the relay lens 7, and radiated to the fundus of the eye E as an annular light flux.

The observation light source 1, the relay lens 2, the photographing light source 3, the relay lens 4, the ring-shaped aperture stop 5, the reflecting mirror 6, the relay lens 7, and the perforated mirror 8 are illuminated for observation toward the eye E to be examined. An illumination optical system 1A that emits light and illumination light for photography is configured.

The reflected light reflected by the fundus of the eye E is emitted from the cornea C of the eye E as substantially parallel light, collected by the objective lens 9 at its focal position, and The light passes through the hole 8a of the mirror 8 and is guided to the imaging lens 11,
The reflected light that has passed through the imaging lens 11 is deflected in the optical path by a quick return mirror 13 provided in the photographing camera 12, and forms an image on the imaging surface 14 as a fundus image. The quick return mirror 13 can be retracted from the optical path of the observation and imaging optical system 1B described later.

The fundus image formed on the image plane 14 can be observed by the observation eye via the eyepiece 16 and the prism 15. In FIG. 1, reference numeral 17 denotes a film of the photographing camera 12 disposed behind the quick return mirror 13.

The objective lens 9, the imaging lens 11, the quick return mirror 13, the prism 15, the eyepiece 1
6 constitutes an observation and imaging optical system 1B for observing and photographing the image of the eye E to be inspected.

The ring-shaped aperture stop 5 is provided with a reflecting member 18 for reflecting light at a central light shielding portion 5a.
Part of the observation illumination light is deflected (reflected) to the side of the ring-shaped aperture stop 5 by the reflection member 18, condensed by the condenser lens 19, and enters the light receiving element 20.

The reflection member 18, the condenser lens 19 and the light receiving element 20 constitute an illumination light amount detecting means 2A for detecting the amount of the illumination light.

A lens-equipped prism 22 as an optical path deflecting member is disposed between the perforated mirror 8 and the imaging lens 11, and a rotary solenoid 23 is provided so as not to hinder observation of the eye E at all times. Observation photographing optical system 1 by operation
It is driven to retreat from the optical path of B. The reflected light deflected by the lens-equipped prism 22 is incident on the light receiving element 28. A reflected light amount detecting means 2B for detecting the light amount of the reflected light from the eye E by the lens-equipped prism 22 and the light receiving element 28 is constituted.

Next, a control system of the fundus camera will be described.

This fundus camera operates by a control program which takes in the respective detection signals of the light receiving element 20 and the light receiving element 28, obtains values of an illumination light amount, a reflected light amount, a ratio thereof, and the like, and performs overall control. A light amount calculation unit 21 to be sent to the control unit 30 is provided. The control unit 30 is connected with a light emission control unit 41 that controls light emission of the imaging light source 3 composed of the xenon lamp and a drive unit 42 that drives the rotary solenoid 23.

Further, the control unit 30 provides the light amount of the photographing light source 3 (reflectance of the fundus) based on the value of the light amount obtained by the light amount calculation unit 21 or the ratio of the light amount to the reflected light amount (reflectance of the fundus). A light amount setting unit 31 for calculating and storing data of, for example, light emission time), and the photographing light source 3 obtained by the light amount calculation unit 21 based on each detection signal of the light receiving element 20 and the light receiving element 28, which will be described in detail later. An alarm unit 32 for issuing an alarm when the light emission amount of the light source 3 is lower than a predetermined value determined by the rating (W value) of the photographing light source 3, a photographing switch 33 for issuing a light emission command to the photographing light source 3, An illumination light amount table 35 storing data of the rated light emission amount of the light source 3 is connected.

The light quantity setting unit 31 can manually set the data of the light emission quantity (for example, light emission time) of the photographing light source 3 by a key input unit 34 connected to the control unit 30.

Considering the amount of light required for proper exposure of the film 17, for example, when the reflectance of the fundus is large or the pupil diameter is large, the amount of light emitted from the photographing light source 3 is relatively small. In the case where the reflectivity of the fundus is small and the diameter of the pupil is small, the appropriate exposure cannot be obtained unless the amount of light emitted from the photographing light source 3 is relatively large.

Next, the operation of the above-described fundus camera will be described with reference to a flowchart based on the control program shown in FIG.

The subject's eye E faces the fundus camera, the observation light source is turned on, and the subject's eye E is irradiated with illumination light for observation. At this time, a part of the illumination light for observation is deflected (reflected) to the side of the ring-shaped aperture stop 5 by the reflection member 18 constituting the illumination light amount detection means 2A, and the condensing lens 19
And is incident on the light receiving element 20. Light receiving element 2
The output signal of "0" is sent to the light amount calculation unit 21, and the value of the illumination light amount is obtained.

A part of the reflected light from the eye E is deflected by the prism 22 with the lens which is instantaneously inserted into the optical path of the observation and photographing optical system 1B by the operation of the rotary solenoid 23 driven by the drive unit 42. , And enters the light receiving element 28. The output signal of the light receiving element 28 is sent to the light amount calculation unit 21, and the value of the reflected light amount is obtained. Further, the light amount calculation unit 21 also obtains a ratio between the illumination light amount and the reflected light amount (step S1).

The control unit 30 sends the value of the ratio between the illumination light amount and the reflected light amount obtained by the light amount calculation unit 21 to the light amount setting unit 31. The light amount setting unit 31 calculates the light amount (for example, light emission time) of the photographing light source 3 based on the ratio between the illumination light amount and the reflected light amount.
Is calculated and stored (step S).
2).

Next, when the examiner presses down the photographing switch 33 and issues a light emission command to the photographing light source 3 (step S).
3) The control unit 30 controls the light emission control unit 41 with reference to the data of the light emission amount based on the control program,
The imaging light source 3 is turned on to emit illumination light for imaging (step S4). Illumination light for photography from the photography light source 3 passes through a relay lens 4 and a ring-shaped aperture stop 5 of the illumination optical system 1A, is reflected by a reflection mirror 6, passes through a relay lens 7, and is perforated by a perforated mirror 8 to an objective lens 9 And irradiates the fundus of the eye E as an orbicular luminous flux. At this time, part of the illumination light for imaging is deflected to the side of the ring-shaped aperture stop 5 by the reflecting member 18 ( Reflected) and the condensing lens 19
And is incident on the light receiving element 20. Light receiving element 2
The output signal of "0" is sent to the light amount calculation unit 21, and the value of the illumination light amount for photographing is obtained (step S5).

Next, the control unit 30 controls the light amount calculation unit 21.
Then, the value of the illumination light amount for photography at this time is fetched, and it is determined with reference to the illumination light amount table 35 whether or not the value of the illumination light amount for photography is a rated light amount determined by the imaging light source 3 ( In step S6), if the amount of light is smaller than the rated light amount, re-emission control (extension of light emission time) of the photographing light source 3 is performed (step S7). Thereby, the imaging light source 3
The amount of emitted light is actually detected, and control can be performed so that a sufficient amount of light is emitted. Even if the imaging light source 3 is deteriorated, the eye E is irradiated with sufficient illumination light from the imaging light source 3 to the eye E. To obtain a good-quality fundus image.

Next, the operation of manually setting the light emission amount of the photographing light source 3 to the light amount setting section 31 will be described with reference to FIG.

In this case, the examiner must input the key unit input 3
4 to input a value (light emission time) for instructing the light emission amount of the photographing light source 3 (step S11). Key part input 34
Is stored in the light amount setting unit 31 under the control of the control unit 30 (step S12).

Next, when the examiner presses the photographing switch 33 and issues a light emission command to the photographing light source 3 (step S).
13) The control unit 30 controls the light emission control unit 41 with reference to the light emission amount data of the light amount setting unit 31 based on the control program, turns on the imaging light source 3, and emits illumination light for imaging. (Step S14). Illumination light for photography from the photography light source 3 passes through a relay lens 4 and a ring-shaped aperture stop 5 of the illumination optical system 1A, is reflected by a reflection mirror 6, passes through a relay lens 7, and is perforated by a perforated mirror 8 to an objective lens 9 And irradiates the fundus of the eye E as an orbicular luminous flux. At this time, part of the illumination light for imaging is deflected to the side of the ring-shaped aperture stop 5 by the reflecting member 18 ( The light is reflected (reflected), condensed by the condenser lens 19, and enters the light receiving element 20. The output signal of the light receiving element 20 is sent to the light amount calculation unit 21, and the value of the illumination light amount for photographing is obtained (step S).
15).

The control unit 30 refers to the illumination light amount table 35 to determine whether or not the value of the illumination light amount for photography is a rated light amount determined by the imaging light source 3 (step S1).
6) If the amount of light is smaller than the rated light amount, alarm information to that effect is output (step S17).

As a specific example of the alarm information, as shown in FIG. 4, a liquid crystal display unit 4 provided on the surface of the housing of the fundus camera is used.
In accordance with the control program, the character "error" is displayed on the surface of the fundus camera 3 as shown in FIG.
Red, yellow, and green 3 that schematically indicate the degree of deterioration of the light source 3
LED lamps 50a to 50c of colors are provided together with a tilt graph 51 having a full display F and an empty display E,
For example, the LED lamp 50b of the LED lamps 50a to 50c may be turned on to make the examiner recognize that the light emission amount of the imaging light source 3 is slightly small.

Next, a modified example of the fundus camera according to the embodiment of the present invention will be described with reference to FIG. The retinal camera shown in FIG. 6 has the same basic configuration as the retinal camera shown in FIG.
The configuration of B is changed.

That is, instead of the condenser lens 19, the light receiving element 20, and the light receiving element 28, the respective incident ends of the optical fibers 61, 62 are arranged near the reflecting member 18, the prism 22 with the lens. Are guided to one light receiving element 63, and the detection signal of the optical fiber 63 is sent to the light amount calculation unit 21.

With such a configuration, the same operation as the fundus camera shown in FIG. 1 can be exhibited.
The optical fibers 61 and 62 are used and one light receiving element 63 is connected to the illumination light amount detecting means 2A and the illumination light amount detecting means 2B.
The structure of the retinal camera can be simplified by using the light receiving means.

[0041]

According to the first aspect of the present invention, the amount of light emitted from the imaging light source can be actually detected and controlled so that the amount of emitted light is sufficient, whereby sufficient illumination light from the imaging light source is supplied to the subject's eye. It is possible to provide an ophthalmologic apparatus that can perform irradiation and imaging to obtain a high-quality eye image.

According to the second aspect of the present invention, it is possible to provide an ophthalmologic apparatus that can easily determine the deterioration of the imaging light source.

According to the third aspect of the present invention, it is possible to provide an ophthalmologic apparatus capable of simplifying the configurations of the illumination light amount detecting means and the reflected light amount detecting means.

According to the fourth aspect of the present invention, it is possible to provide an ophthalmologic apparatus capable of eliminating a problem in photographing an eye to be inspected.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an overall configuration of an ophthalmologic apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation of the ophthalmologic apparatus according to the embodiment of the present invention.

FIG. 3 is a flowchart illustrating an operation of the ophthalmologic apparatus according to the embodiment of the present invention in the case of manually setting the amount of emitted light.

FIG. 4 is an explanatory diagram showing a display example of alarm information of the ophthalmologic apparatus according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing another display example of alarm information of the ophthalmologic apparatus according to the embodiment of the present invention.

FIG. 6 is a diagram showing a modified example of the ophthalmologic apparatus according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Observation light source 1A Illumination optical system 1B Observation imaging optical system 2A Illumination light amount detection means 2B Reflection light amount detection means 3 Imaging light source 9 Objective lens 18 Reflection member 19 Condensing lens 20 Light receiving element 21 Light amount calculation part 22 Prism with lens 28 Light receiving element 30 Control unit 31 Light amount setting unit 32 Alarm unit 33 Shooting switch 34 Key input unit 35 Illumination light amount table 41 Light emission control unit 42 Drive unit 61 Optical fiber 62 Optical fiber 63 Light receiving element

Claims (4)

[Claims] An illumination optical system having an illumination light source and a photographing light source for irradiating the subject's eye with illumination light and photographing light; and an illumination optical system facing the subject's eye and reflecting light from the subject's eye based on the reflected light from the subject's eye. An observation optical system that captures an image of the eye to be inspected; an illumination light amount detector that detects the amount of illumination light from the illumination light source; a reflected light amount detector that detects the amount of reflected light from the observation optical system; A light emission control unit for controlling light emission of a photographing light source of an illumination optical system, wherein the illumination light amount is detected by the illumination light amount detection unit and the reflected light amount detection unit. An ophthalmologic apparatus, wherein the light emission control of the imaging light source is detected by the illumination light amount detection means, and the re-emission control is performed by the light emission control means in accordance with the detected light quantity. 2. An illumination optical system having an illumination light source and an imaging light source for irradiating illumination light and imaging light to an eye to be inspected, and an illumination optical system facing the eye to be inspected and based on reflected light from the eye to be inspected. An observation and imaging optical system that captures an image of the eye to be inspected; an illumination light amount detection unit that detects the amount of illumination light from the illumination light source; a reflected light amount detection unit that detects the amount of reflected light from the observation and imaging optical system; Light emission amount setting means for setting the light emission amount of the light source; light emission control means for controlling light emission of a photographing light source of the illumination optical system based on a set value of the light emission amount setting means; and a photographing light source controlled by the light emission control means Capture the detection value of the amount of light emitted from the illumination light amount detection means,
An ophthalmologic apparatus comprising: an alarm unit that outputs alarm information when a detected value is insufficient for a set light emission amount. 3. The illumination light amount detecting means and the reflected light amount detecting means comprise a pair of reflecting members for reflecting a part of light passing through an illumination optical system and a part of light passing through an observation and photographing optical system, and a pair of reflecting members. 3. The ophthalmologic apparatus according to claim 1, wherein the pair of optical fibers guides each reflected light, and one light receiving element on which the light guided by the pair of optical fibers is incident. 4. The ophthalmologic apparatus according to claim 3, wherein the reflecting member of the reflected light amount detecting means is configured to be insertable into and removable from an optical path of the observation and photographing optical system.