JPH0683Y2 - Fundus camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention has an exciter filter device and a barrier filter device, and these filter devices are provided with a general fluorescence photographing filter and an infrared fluorescence photographing filter, respectively. Regarding fundus camera.

(Prior Art) In fundus photography with a fundus camera, general fluorescent (visible fluorescence) fundus photography performed after intravenous injection of sodium fluorescein and the like, and red developed in recent years performed after intravenous injection of indocyanine green etc. External fluorescent fundus photography is performed.

Since these fundus images are taken in different wavelength ranges, different filters are installed in the exciter filter device and the barrier filter device in order to take both of these fundus images with the same fundus camera. Then, it is necessary to select an appropriate filter depending on the shooting method.

Conventionally, an examiner selects these filters.

(Problems to be solved by the invention) However, this filter selection is complicated because it is necessary to select an appropriate filter from a plurality of filters for each filter device. It was easy, and it was a cause of failure in shooting if the wrong filter was selected.

The present invention has been made under such circumstances, and an object thereof is to prevent failure of fundus imaging due to an error in filter selection in this type of fundus camera.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides an exciter filter for visible fluorescence photography and an exciter filter for infrared fluorescence photography so that fluorescence photography can be performed with different fluorescence wavelengths. And is provided in the optical path of the illumination system so as to be removable, and a barrier filter for visible fluorescence imaging and a barrier filter for infrared fluorescence imaging are provided so as to be removable in the optical path of the imaging system. It is characterized in that an avoiding means is provided for avoiding a failure of photographing.

(Operation) According to this invention, an exciter filter for visible fluorescence photography and an exciter filter for infrared fluorescence photography are detachably provided in the optical path of the illumination system so that fluorescence photography can be performed with different fluorescence wavelengths. Even in the case of a fundus camera in which a barrier filter for visible fluorescence photography and a barrier filter for infrared fluorescence photography are provided so that they can be inserted into and removed from the optical path of the photography system, the avoidance means avoids the failure of photography in advance. be able to.

(Example) Hereinafter, the example shown in the drawings will be described. First, FIG.
The first embodiment shown in FIG. 3 will be described.

FIG. 1 is an explanatory view of a filter device, FIG. 2 is an electric circuit diagram, and FIG. 3 is an optical system of a fundus camera.

The optical system of the first embodiment will be described with reference to FIG. 3. The illumination system 1 includes a photographing light source 2 including a xenon lamp, a condenser lens 3, a half mirror 4, an exciter filter device 5, a mirror 6, a ring slit 7, and a relay. Optical members such as the lens 8, the perforated mirror 22, and the objective lens 21 are sequentially arranged in this order. Further, in the half mirror 4, an observation light source 11 and a condenser lens 12 are arranged in a direction perpendicular to the illumination optical axis O ₁ of the illumination system 1.

On the other hand, the photographing system 20 includes an objective lens 21, a perforated mirror 22, a relay lens 23, optical members such as a barrier filter device 24, and a film 26.

Further, the observation system 30 is the film 2 of the photographing system 20 described above.
Optical members other than 6 are provided, a flip-up mirror 25 which is provided between the film 26 and the barrier filter device 24 so as to be freely inserted and removed, and optical members such as a prism 31 and an eyepiece lens 32.

In such a configuration, the light emitted from the photographing light source 2 is projected onto the fundus of the eye E to be examined through each optical member of the illumination system 1. At this time, when the exciter filter described later is not provided in the illumination system 1, the light flux projected on the fundus is reflected by the fundus.

On the other hand, when an exciter filter, which will be described later, is provided in the illumination system 1, the exciter filter device 5 of the illumination system 1 transmits only light having a wavelength that can excite the fluorescent agent. When the illumination system 1 projects a light flux having a wavelength capable of fluorescence excitation onto the eye E to be examined, the light flux is absorbed by the fluorescent agent in the fundus blood vessel of the eye to be examined and fluorescence is emitted from the fluorescent agent.

Such reflected light or fluorescence on the fundus of the eye is reflected by the objective lens 21,
The film 26 is passed directly through the hole of the perforated mirror 22 and the relay lens 23 or after passing through the barrier filter device 24.
Will be guided to. As a result, a fundus image by general illumination or a fundus blood vessel image by fluorescence is recorded on the film 26.

Further, the flip-up mirror 25 is arranged on the optical axis O ₂ during observation. Thereby, the reflected light or fluorescence at the fundus passes through the objective lens 21, the hole of the perforated mirror 22 and the relay lens 23 and is guided to the flip-up mirror 25 directly or after passing through the barrier filter device 24. The light guided to the flip-up mirror 25 is guided to the examiner's eye through the prism 31 and the eyepiece lens 32. As a result, the eye E and the like of the eye E to be inspected can be observed.

The barrier filter device 24 and the flip-up mirror 2
An image pickup device 27, which is composed of a solid-state image pickup device or the like and has infrared sensitivity, is installed between the image pickup device 5 and the image pickup device 5 via a similar flip-up mirror, and outputs to a monitor television or the like (not shown) for monitor output.

The exciter filter device 5 and the barrier filter device 24 are configured as shown in FIG.
In this embodiment, these filter devices 5, 24
Have the same configuration, the description will be made below with reference to the barrier filter device 24 shown in FIG.

In the figure, 41 is the body of the fundus camera, and in the figure, O ₂
Indicates the photographing optical axis.

Then, the direction orthogonal to the optical axis O ₂ of the machine body 41 (first
The filter holder 42 is slidably attached to the barrier filter device 24 by a manual operation (see the arrow).

This filter holder 42 has three through holes 43a,
43b and 43c are installed in an array in the sliding direction,
The through hole 43b at the center is left unchanged, and the through holes 43 at both ends are left.
a and 43c have general fluorescence (also called visible fluorescence)
An imaging barrier filter 44 and an infrared fluorescence imaging barrier filter 45 are installed.

Therefore, by displacing the filter holder 42 in the direction of the arrow, the light transmitting 4 is moved to the optical path on the optical axis O _2.
3b, the general fluorescent photographing barrier filter 44, or the infrared fluorescent photographing barrier filter 45 can be positioned.

In this embodiment, the filter holder 4
2, two projections 46a and 46b are integrally formed corresponding to a microswitch described later, and these projections 46a and 46b are used for the general fluorescence imaging barrier filter 44 or infrared fluorescence imaging. When the barrier filter 45 is located on the optical axis O _2, it functions as an operator that turns on any one of micro switches 47 and 48 described later.

In this embodiment, the micro switch 47 is turned on by the protrusion 46a when the general fluorescence imaging barrier filter 44 is located on the optical axis O ₂ , and the micro switch 48 is operated by the infrared fluorescence imaging barrier filter 45 on the optical axis. When it is located on O ₂ , it is turned on by the protrusion 46b.

The exciter filter device 5 of this embodiment has the same structure as the barrier filter device 22 and is composed of an exciter filter for general fluorescence (also referred to as visible fluorescence) and an exciter filter for infrared fluorescence imaging. Microswitches 51 and 52 are installed, one of which is turned on depending on the position of the holder 42. The microswitch 51 is turned on when the exciter 44 for general fluorescence imaging is located on the optical axis O ₁ , and the microswitch 52 is red. It is turned on when the external fluorescence imaging exciter 45 is located on the optical axis O ₁ .

Then, these micro switches 47, 48, 5
1, 52 connect the microswitches 47 and 52 in series as shown in FIG.
8 and 51 are also connected in series, these are connected in parallel,
It is connected to a known alarm device 54 together with the power source 53.

Therefore, these micro switches 47, 48, 5
In the case where one of the filters located on the optical axis in the exciter filter device 5 and the barrier filter device 24 of 1, 52 is for general fluorescence imaging, and the other is for infrared fluorescence imaging, The alarm device 54 is energized, and a warning sound and a warning lamp are turned on to warn the examiner.

Therefore, if these filters are mistakenly inserted, the examiner can inspect and correct the filters by this alarm, prevent filter selection errors in the fundus camera, and prevent failure of fundus imaging. You can

The fundus camera has a cpu that controls each unit. Therefore, this cpu is turned on by the switches 47, 52 and 51.
By inputting an OFF signal and controlling the relays of the fundus camera by this cpu as follows, it is possible to prevent unnecessary photographing of the fundus. For this purpose, the relay processing of the fundus camera can be performed when the switches 47, 52 or 48, 51 are both turned on, or when all the switches 47, 52, 48, 51 are turned off. Let the state control relays with cpu. Moreover, when only one of the switches 47 and 52 or only one of the switches 48 and 51 is ON, relay control is performed by cpu so as to prohibit relay processing of the fundus camera.

Next, a second embodiment shown in FIGS. 4 and 5 will be described.

In the first embodiment described above, a warning is issued for the wrong insertion of the filter. In the second embodiment, however, the filter holder 42 is provided to mechanically prevent the wrong selection of the filter. The second embodiment is the same as the first embodiment except that it is configured so as to limit the operation of the above.

Hereinafter, only this point will be described.

That is, the first embodiment and the similarly configured protruding 46a in a state where the through hole 43b formed in the center is located on the photographing optical axis O ₂ of the filter holder 42, the 46b outer, respectively rods The solenoid devices 57 and 58 configured to be capable of retracting and retracting are installed, and by energizing these solenoid devices 57 and 58, the rod is in a protruding state and prevents the protrusions 46a and 46b from moving to the outside. This limits the movement of the filter holder 42.

Then, when the solenoid device 57 is operated, the projection 46a is locked to prevent the selection of the infrared fluorescence imaging barrier filter 45, and when the solenoid device 58 is operated, the projection 46b is locked and the general fluorescence imaging barrier filter 44 is locked. Choices are being blocked. Similarly, in the exciter filter device 5, solenoid devices 61 and 62 are similarly installed, and when the solenoid device 61 operates, selection of the general fluorescence imaging exciter filter is blocked, and when the solenoid device 62 operates, the infrared fluorescence imaging exciter filter is activated. Are configured to be blocked.

Then, these solenoid devices 57, 58, 61, 6
2 are connected to form the electric circuit shown in FIG.

That is, these solenoid devices 57, 58, 61,
62 connects the solenoid devices 57 and 61 in series as shown in FIG.
And are also connected in series, these are connected in parallel, and a selection switch 63 for selectively connecting these is provided and connected to the power supply 53.

The selection switch 63 is a switch for selecting the type of imaging, and either general fluorescence imaging or infrared fluorescence imaging is selected, and the combination of the solenoid devices selected by the selection switch 63 is energized. The selection of one of the filters is prevented in the filter device.

That is, when the solenoid devices 57 and 61 are energized,
Exciter filter device 5 and barrier filter device 2
4, the selection of the general fluorescence imaging filter is blocked, and only the selection of the infrared fluorescence imaging filter becomes possible, and vice versa when the solenoid devices 58 and 62 are energized.

For this reason, the examiner cannot make a selection other than the filter corresponding to the type of imaging to be selected by the selection switch 63, and the erroneous insertion of the filter can be prevented.
It is possible to prevent failure of fundus imaging.

In this embodiment, the combination of the solenoid devices to be energized is determined based on the operation of the selection switch 63. However, the exciter filter device 5 or the barrier filter device 24 is pushed first. It is configured to detect which photographing is performed from the position of the filtered filter holder 42 and the like, and to automatically operate the selection switch 63 using an actuator such as a solenoid device based on the result. Good.

Next, a third embodiment shown in FIGS. 6 and 7 will be described. In this embodiment, a drive device 64 such as a solenoid device for driving the filter holder 42 in the exciter filter device 5 and the barrier filter device 24 is used. Each of them is provided, and a filter corresponding to the type of shooting selected by the selection switch 63 is automatically set. Other points are the same as those of the first and second embodiments, and the exciter is also provided. The filter device 5 and the barrier filter device 24 have the same configuration.

The barrier filter device 24 will be described below with reference to FIG.

That is, in FIG. 6, reference numeral 64 is a drive unit composed of a three-position solenoid device, and 65 is a guide bush, which is a general fluorescence imaging barrier filter 44 and infrared fluorescence installed in the filter holder 42 by the operation of the drive unit 64. The photographing barrier filter 45 or the through hole 43b is alternatively positioned on the optical axis O ₂ .

Then, the drive device 64 for these filter devices 5, 24
Are connected as shown in FIG.

In FIG. 7, reference numeral 66 is a control device including a CPU, and 6
3 is a selection switch for the type of photographing, 68 is an insertion / removal switch for the filter holder 42, and these selection switches 6
7, both the exciter filter device 5 and the filter holder 42 of the barrier filter device 24 are driven by the drive devices 64 respectively installed therein, and selected by the selection switch 63 based on the inputs of the switch 7 and the insertion / removal switch 68. A filter suitable for the type of the captured image is located on the optical axes O ₁ and O ₂ .

Therefore, the examiner does not need to operate the filter, and there is no possibility of an erroneous operation by the examiner, so that failure of fundus imaging can be prevented.

(Effect of the Invention) Since the present invention is configured as described above, the exciter filter for visible fluorescence photography and the exciter filter for infrared fluorescence photography illuminate so that fluorescence photography can be performed with different fluorescence wavelengths. Even in the case of a fundus camera that is removably provided in the optical path of the system and has a barrier filter for visible fluorescence photography and a barrier filter for infrared fluorescence photography that is removably provided in the optical path of the photography system, Failure can be avoided in advance.

[Brief description of drawings]

The drawings are related to an embodiment of the present invention. FIG. 1 is an explanatory view of a main part of the first embodiment, FIG. 2 is an electric circuit diagram of the first embodiment, and FIG. 3 is an optical layout diagram of the first embodiment. FIG. 4 is an explanatory view of essential parts of the second embodiment, FIG. 5 is an electric circuit diagram of the second embodiment, FIG. 6 is an explanatory view of essential parts of the third embodiment, and FIG. 7 is control of the third embodiment. It is a block diagram. DESCRIPTION OF SYMBOLS 1; Illumination system, 5; Exciter filter device, 20; Imaging system, 24; Barrier filter device, 26; Film, 44; Barrier filter for general fluorescence imaging, 45; Barrier filter for infrared fluorescence imaging, 54; Warning device, 63; selection switch; 64; drive device; 68; insertion / removal switch.

Claims (1)

[Scope of utility model registration request] 1. An exciter filter for visible fluorescence photography and an exciter filter for infrared fluorescence photography are detachably provided in an optical path of an illumination system so that fluorescence photography can be performed with different fluorescence wavelengths. A barrier filter for photographing and a barrier filter for infrared fluorescent photographing are detachably provided in the optical path of the photographing system, and avoidance means for avoiding photographing failure due to the different fluorescence wavelength is provided. Fundus camera characterized by.