JP4512394B2 - Ophthalmic imaging equipment - Google Patents

Description

  The present invention relates to an ophthalmologic photographing apparatus, more specifically, an illumination optical system that projects illumination light onto the fundus of a subject's eye via a diaphragm such as a ring-shaped diaphragm (ring slit), and a fundus image illuminated with the illumination light. The present invention relates to an ophthalmologic photographing apparatus including a photographing optical system for photographing.

When performing normal fundus color photography using an ophthalmologic photographing device such as a fundus camera, mydriatic photography in which a mydriatic agent is instilled into the subject's eye, or because the mydriatic agent imposes a burden on the subject, the mydriatic agent There is non-mydriatic photography that irradiates the fundus with infrared light and performs observation by observing the fundus, and in the case of fluorescence photography, visible fluorescence photography that captures a visible fluorescence image, infrared fluorescence image Infrared fluorescence photography for imaging The fundus camera specialized for each shooting mode is preferable because the illumination filter and shooting filter used differ depending on each shooting mode, or the optical characteristics are different, but it can also be used in consideration of cost performance. Various fundus cameras have been developed. For example, Patent Document 1 corresponds to a fundus camera that supports mydriatic imaging, non-mydriatic imaging, and visible fluorescence imaging, and Patent Document 2 corresponds to mydriatic imaging (color imaging), visible fluorescence imaging, and infrared fluorescence imaging. A fundus camera that can be used is a fundus camera that can be similarly used for mydriatic imaging (color imaging), visible fluorescence imaging, and infrared fluorescence imaging. Patent Document 3 further discloses the wavelength characteristics of filters used in each imaging mode. Patent Document 4 discloses a mechanism for interlocking a variable power lens, a fluorescent filter, and a ring slit in accordance with each photographing mode.
JP-A-9-140672 ([Table 1], [Table 2]) JP-A-8-150120 (paragraphs [0042] to [0054]) Japanese Patent Laid-Open No. 1-300926 (FIGS. 1 to 8) Japanese Patent No. 2894359 (FIG. 1)

  However, if the fundus camera is compatible with four shooting modes: mydriatic photography, non-mydriatic photography, visible fluorescence photography, and infrared fluorescence photography, various filters can be inserted and removed in complex combinations by switching to each photography mode. Therefore, the apparatus is complicated, various setting operations are complicated, and operation mistakes are increased. Therefore, there is no fundus camera corresponding to the above four photographing modes.

  Therefore, an object of the present invention is to provide an ophthalmologic photographing apparatus capable of photographing the fundus with at least four photographing modes of mydriatic photographing, non-mydriatic photographing, visible fluorescent photographing, and infrared fluorescent photographing with a simple configuration. .

The present invention for solving the above problems
An ophthalmologic photographing apparatus comprising: an illumination optical system that projects illumination light onto the fundus of an eye to be examined through a diaphragm; and a photographing optical system that photographs a fundus image illuminated with the illumination light,
An imaging filter having a wavelength characteristic as an infrared fluorescent filter, and inserted in the optical path of the imaging optical system;
An electronic imaging unit for infrared light for observing the fundus of the eye to be examined;
An electronic imaging device for visible light for taking a still image of the fundus of the eye to be examined,
When shooting a still image using an electronic imaging device for the visible light, thereby inserting and extracting the photographic filter in accordance with image information accumulation time of the visible light electronic imaging device to the optical path of the photographing optical system It is characterized by.

In the present invention, when taking a still image using the visible light electronic imaging device, the imaging device has a wavelength characteristic as an infrared fluorescent filter according to the image information accumulation time of the visible light electronic imaging device. since so as to insert and detach the filter in the optical path of the photographing optical system, it becomes unnecessary to turn off the observation light source.

  The present invention includes an illumination optical system that projects illumination light onto the fundus of a subject's eye via a diaphragm such as a ring slit, and an imaging optical system that captures a fundus image illuminated with the illumination light. The present invention will be described in detail with reference to an embodiment shown in the drawings.

  FIG. 1 shows an embodiment of an ophthalmologic photographing apparatus (fundus camera) according to the present invention. A light beam from an observation light source 1 such as a halogen lamp is condensed by a concave mirror 2 and then taken by a photographing light source. After being reflected by a mirror 5 through a strobe 3 and a condenser lens 4, the light passes through relay lenses 20 and 21 and is reflected by a perforated total reflection mirror 22. The light beam reflected by the total reflection mirror 22 is reflected by an objective lens 23. After being imaged by the pupil Ep of the eye E, the light enters the fundus Er.

  In this fundus illumination optical system, an infrared transmission filter 6 is inserted after the observation light source 1 when there is no pupil, and a plurality of ring slits 11 to 13 can be switched in the illumination optical system. A turret disk 15 capable of switching the disk 10 and the plurality of illumination filters 16 to 18 is provided. As shown in FIG. 2 (A), the turret disk 10 can be rotated around a shaft 10a, and a standard ring slit (first ring-shaped aperture) 11 around the periphery of the turret disk 10 is used. A slit (second ring-shaped diaphragm) 12 and a fluorescent ring slit (third ring-shaped diaphragm) 13 which is a large ring slit are arranged. By rotating the disk, one of the ring slits is moved to the center. Can be inserted into the optical axis so as to coincide with the optical axis of the illumination optical system.

  The standard ring slit 11 is a ring-shaped stop in which the circular aperture stop 11a and the circular light shielding plate 11b are concentrically combined, and the outer diameter (diameter of the circular aperture stop 11a) is D1, and the inner diameter (diameter of the circular light shielding plate 11b). Is d1. The small pupil ring slit 12 is a ring-shaped stop in which the circular aperture stop 12a and the circular light shielding plate 12b are concentrically combined, and the outer diameter D2 (the diameter of the circular aperture stop 12a) is outside the standard ring slit 11. It is smaller than the diameter D1, and its inner diameter d2 (diameter of the circular light shielding plate 12b) is smaller than the inner diameter d1 of the standard ring slit. The fluorescent ring slit 13 is a ring-shaped stop in which the circular aperture stop 13a and the circular light shielding plate 13b are concentrically combined, and the outer diameter D3 (the diameter of the circular aperture stop 13a) is the outer diameter of the standard ring slit 11. The inner diameter d3 (the diameter of the circular light shielding plate 13b) is larger than D1 and smaller than the inner diameter d1 of the standard ring slit 11.

  In such a configuration, the small pupil ring slit 12 has at least an outer diameter smaller than that of the standard ring slit 11, and the fluorescent ring slit 13 has a ring shape through which illumination light passes through the standard ring slit 11. The area of the portion is large, and the amount of transmitted light increases corresponding to the area.

  These ring slits inserted into the optical path of the illumination optical system are imaged substantially at the position of the pupil Ep of the eye E, and the illumination light is incident through the ring-shaped opening, thereby illuminating the fundus uniformly. Is done. At this time, harmful reflected light from the fundus is blocked by the image of the circular light shielding plate of each ring slit. The standard ring slit 11 is a commonly used ring slit, and the small pupil ring slit 12 is a so-called small pupil when the mydriatic state of the subject is not sufficient or when the subject is a child. The outer diameter is made smaller than that of a standard ring slit and the inner diameter is also made smaller to prevent a reduction in illumination light. Further, the fluorescent ring slit 13 is mainly used in infrared fluorescent photographing, and has an outer diameter larger than that of the standard ring slit 11 and an inner diameter smaller in order to allow more illumination light to enter. . In the case of visible fluorescent photographing, the standard ring slit 11 is usually used. However, when the amount of light is required, the fluorescent ring slit 13 which is a large ring slit can be used.

  Further, behind the turret disk 10 for switching the ring slit, as shown in FIG. 2B, various illumination light filters, that is, a through filter 16, an exciter filter for visible fluorescence that allows a blue light beam of 450 nm to 520 nm to pass therethrough. 17, a turret disk 15 is provided that is rotatable about a shaft 15a on which an infrared fluorescent exciter filter 18 that passes infrared light of 700 nm to 800 nm is disposed. When the turret disk 15 is rotated, any one of the illumination light filters can be inserted into the optical path of the illumination optical system. In the case of the through filter 16, all the light beams can pass therethrough. On the other hand, the exciter filter 17 for visible fluorescence is inserted at the time of visible fluorescence photography, and the exciter filter 18 for infrared fluorescence is inserted into the optical path at the time of infrared fluorescence photography, and transmits light only in the infrared region.

  The reflected light from the fundus Er of the eye E is again passed through the center of the pupil Ep, received through the objective lens 23, passed through the hole of the perforated total reflection mirror 22, and placed in the optical path of the photographing optical system. The light passes through the photographing diaphragm 24, the focus lenses 25 and 26, and the imaging lens 27, and enters the return mirror 30 (first return mirror). The imaging lens 27 can be exchanged for an imaging lens 28 having different magnifications, thereby constituting a zooming mechanism. Further, a barrier filter (imaging filter) 42 can be inserted between the imaging aperture 24 and the focus lens 25 in this imaging optical path so as to transmit visible fluorescence from the fundus during visible fluorescence imaging.

  The light flux from the fundus reflected by the return mirror 30 is reflected by the return mirror 31 (second return mirror) and enters an eyepiece (finder) 32 that constitutes the naked eye observation optical system. The fundus image can be observed through the. When the infrared transmission filter 6 is inserted and the return mirror 31 jumps up and leaves the optical path, the light beam from the fundus is reflected by the return mirror 33 (third return mirror) and enters the observation optical system for infrared light. To do. This infrared observation optical system has an infrared CCD (infrared light electronic imaging unit) 35 having sensitivity to infrared light, and an infrared fundus image picked up by the infrared CCD is passed through a switching circuit 39. Are displayed on the monitor 40. Since this imaging unit 35 captures an image during fundus observation, an infrared moving image of the fundus imaged during fundus observation is displayed on the monitor 40, and the examiner observes the fundus image on the monitor. Alignment and focusing can be performed.

  In addition, an infrared fluorescence barrier filter (imaging filter) 43 that transmits infrared light from 820 nm to 900 nm can be inserted into the optical path between the return mirror 31 and the return mirror 33 during infrared fluorescence imaging. Yes.

  When the return mirror 33 jumps up and leaves the optical path, the light beam from the fundus enters the dichroic mirror 34, and visible light and infrared light are separated by this optical element. Visible light is reflected by a dichroic mirror 34 and enters a color CCD (electronic imaging device for visible light) 36 having sensitivity to visible light, while infrared light is transmitted through the dichroic mirror 34 and has sensitivity to infrared light. It is incident on an infrared CCD (infrared light electronic imaging device) 37. Since the fundus image captured by the color CCD 36 is an image reflected by the dichroic mirror 34, it is an inverted image of the fundus captured by the infrared CCD 37. Therefore, an image inversion circuit 38 is provided, and the image inversion circuit 38 inverts one of the images from the color CCD 36 and the infrared CCD 37 to perform image processing so that the observation image and the photographed image coincide with each other. Since these imaging units 36 and 37 capture a fundus image obtained by light emission of the strobe 3 at the time of shooting, a fundus still image is displayed on the monitor 40 via the switching circuit 39. Although not shown in FIG. 1, a recording device is provided so that fundus images captured by the imaging units 36 and 37 can be recorded in the recording device.

  When the return mirror 30 jumps up and leaves the optical path, the fundus image can be taken on a photographic film 44 such as a 35 mm film. Instead of this photographic film, a fundus image can be taken using an imaging unit equivalent to the color CCD 36.

  The ophthalmologic photographing apparatus configured in this way can perform mydriatic photographing, non-mydriatic photographing, visible fluorescent photographing, and infrared fluorescent photographing, and normal color photographing is non-mydriatic photographing or non-mydriatic photographing. Performed with mydriatic photography.

  In the case of mydriatic imaging, a mydriatic agent is instilled into the subject. At this time, the infrared transmission filter 6 is detached from the optical path. As the ring slit, the standard ring slit 11 is normally selected, and in the case of a small pupil, the small pupil ring slit 12 is selected and inserted into the optical path. A through filter 16 is selected as the illumination filter and inserted into the optical path. Since the barrier filters 42 and 43 are for fluorescence photography, they are separated from the optical path, and the return mirrors 30, 31, and 33 occupy the positions shown in the figure. After the light beam from the observation light source 1 is reflected by the mirror 5, it passes through the standard ring slit 11 (or the small pupil ring slit 12), the through filter 16, and the relay lenses 20 and 21, and is a perforated total reflection mirror. 22 is reflected into the objective lens 23 to illuminate the fundus Er. The reflected light from the fundus Er of the eye E passes through the objective lens 23, the perforated total reflection mirror 22, the photographing aperture 24, the focus lenses 25 and 26, and the imaging lens 27, and then the eyepiece through the return mirrors 30 and 31. The light enters the lens 32. Thus, the examiner can observe the fundus with the viewfinder, and can perform alignment such as alignment and focusing. When alignment and focusing are completed, a shutter button (not shown) is operated. In conjunction with this, the strobe 3 emits light, and the return mirror 30 then leaves the optical path, so that the fundus can be photographed in color on the film 44 (or color CCD) or the like. Note that the fundus can be observed by infrared observation without using the eyepiece lens 32. At this time, the return mirror 31 is detached from the optical path, and the fundus image is captured by the infrared CCD 35 as a moving image. Since the fundus image is displayed on the monitor 40 via the switching circuit 39, the examiner can observe the fundus via the monitor 40 and perform alignment and focusing.

  The above-mentioned mydriatic imaging is also summarized in FIG. 3, and a standard or small pupil ring slit is selected as the ring slit depending on whether it is a normal pupil or a small pupil. In addition, since the through filter is selected, the exciter filter is “none”, and the barrier filters 42 and 43 are also separated from the optical path. The observation light quantity and the photographing light quantity are adjusted according to the ring slit, and “0” (default value) is set for the standard ring slit, while “+1” is set for the small pupil ring slit. Is called. In addition, since it is not fluorescent photographing, a timer (not shown) for measuring time after intravenously injecting the fluorescent agent is “none”. In addition, as described above, observation with the naked eye through the finder (eyepiece 32) or observation with the monitor 40 using the infrared CCD 35 is performed as described above, and 35 mm film or color CCD is used as the photographing means. It is done.

  When non-mydriatic photographing is performed, the infrared transmission filter 6 is inserted, and the small pupil ring slit 12 is selected as the ring slit. Further, the return mirror 31 jumps up and leaves the optical path, and at the time of observation, the observation with the monitor 40 by the infrared CCD 35 is different from that at the time of mydriatic photographing. Therefore, the observation means in FIG. 3 is an infrared CCD. Shooting is the same as in mydriatic shooting. In the case of non-mydriatic imaging, since there is no mydriatic eye drop, the burden on the subject is reduced.

  At the time of visible fluorescent imaging, the standard or small pupil ring slits 11 and 12 are selected depending on whether the ring slit is a normal pupil or a small pupil, and the exciter filter 17 for visible fluorescence is used as the illumination light filter. However, the visible fluorescence barrier filter 42 is selected as the imaging filter. At the time of observation, when monitoring with the infrared CCD 35, the infrared transmission filter 6 is inserted, and the return mirror 31 is removed from the optical path. On the other hand, when observation is performed with the finder 32, the infrared transmission filter 6 is detached from the optical path, and the return mirror 31 is inserted into the optical path. When observing with a finder, an exciter filter 17 for visible fluorescence is inserted in the optical path. When alignment and focusing are completed, the fluorescent agent is intravenously injected, the exciter filter 17 and the barrier filter 42 are inserted into the optical path, and the timer starts timing. When the predetermined time T1 elapses, a visible fluorescent image is generated on the fundus by the excitation light that has passed through the visible fluorescent exciter filter 17, so that the shutter button is pressed and the strobe 3 emits light. At this time, since the return mirror 30 jumps up, a visible fluorescent image is taken by the 35 mm film 44 or the color CCD. The same operation is performed every time the shutter button is operated, and a visible light image is taken. When a color image is captured by the color CCD 36, the return mirror 30 is inserted into the optical path, and the return mirrors 31 and 33 are separated from the optical path. Further, when photographing using the color CCD 36, it is preferable to turn off the light source 1 because the light beam from the observation light source 1 becomes an obstacle. However, the infrared fluorescent barrier filter 43 is effective against visible light. Since it has a light shielding effect, the infrared fluorescent barrier filter 43 may be inserted into or removed from the optical path in accordance with the image information storage time of the color CCD 36 instead of turning off the light source 1.

  In the case of visible fluorescent photographing, depending on the condition of the eye to be examined, a fluorescent ring slit 13 that increases the amount of light may be used instead of the standard ring slit 11.

  The case of this visible fluorescent photographing is also summarized in FIG. When a small pupil ring slit is selected, the observation light amount and the photographing light amount are increased as necessary. For example, when the standard ring slit is increased by “+3”, when the small pupil ring slit is selected, the increased amount is “+4”. In addition, when the fluorescent ring slit 13 is used, a large amount of light is irradiated to the eye to be examined, so that the observation light source light amount and the photographing light source light amount are reduced. This is illustrated by “+2” in FIG.

  During infrared fluorescent photography, increasing the illumination light quantity and the photography light quantity does not impose a burden on the subject, and the sensitivity deteriorates. Therefore, both the observation light quantity and the photographing light quantity are increased, and the ring slit is applied to the fundus. The fluorescence ring slit 13 that maximizes the amount of projection light is selected. Further, an infrared fluorescent exciter filter 18 is selected as the illumination light filter, and an infrared fluorescent barrier filter 43 is selected as the photographing filter. At the time of observation, the large ring slit 13 (or the standard ring slit 11) and the infrared fluorescence exciter filter 18 are inserted into the optical path, the return mirror 31 is detached from the optical path, and monitor observation is performed by the infrared CCD 35. When alignment and focusing are completed, the fluorescent agent is intravenously injected, the infrared fluorescent barrier filter 43 is inserted, and the timer starts measuring time. When the predetermined time T2 elapses, an infrared fluorescent image is generated on the fundus by the excitation light that has passed through the infrared fluorescent exciter filter 18, so that the shutter button is pressed and the strobe 3 emits light. At this time, the return mirror 30 is fixed at the position shown in the figure, the return mirror 31 is flipped up and fixed, and the return mirror 33 jumps up each time the shutter button is operated, so that the infrared fluorescent image is dichroic. The image is picked up by the infrared CCD 37 through the mirror 34. The infrared fluorescent image is displayed as a still image on the monitor 40 via the switching circuit 39 after the image is inverted by the image inversion processing circuit 38.

  This infrared fluorescent photographing is also illustrated in FIG. 3 in the same manner. The fluorescent ring slit 13 or the standard ring slit 11 is used as the ring slit, and the observation light quantity and photographing light quantity are adjusted according to the ring slit to be used. To do. For example, “+5” is used when a fluorescent ring slit is used, and “+6” is used when a standard ring slit is used.

  The fluorescence ring slit 13 is inserted into the optical path mainly during infrared fluorescence photography. At this time, an infrared fluorescence exciter filter 18 having wavelength characteristics that transmits light only in the infrared region. As shown in FIG. 1, this is not selected by separate turrets, but instead of the fluorescence ring slit 13 and the infrared fluorescence exciter filter 18 integrated. You may make it arrange | position to a turret. As a result, the fluorescence ring slit 13 has a wavelength characteristic that transmits light only in the infrared region, that is, a wavelength characteristic as an infrared fluorescence excitation filter, and thus does not require a separate infrared fluorescence exciter filter. , The mechanism is simplified.

  Further, instead of using the turret disk 10, the fluorescent ring slit 13 is fixed to the optical path, and the standard ring slit 11 and the small pupil ring slit 12 are selected by a solenoid or the like according to the photographing mode and inserted into the optical path by sliding. You may do it. When the standard ring slit 11 and the small pupil ring slit 12 are not selected and are not inserted into the optical path, the fluorescent ring slit 13 is fixed in the optical path, so the fluorescent ring slit 13 is selected with the turret disk. Be the same. Further, as shown in FIG. 2A, since the inner diameter d3 of the fluorescent ring slit 13 fixed in the optical path is small and the outer diameter D3 is large, the standard ring slit 11 and the small pupil ring slit 12 are provided. When selected, the same effect as when those ring slits are selected on the turret disk can be obtained.

  Similarly, instead of using the turret disk 15, the exciter filter 17 for visible fluorescence and the exciter filter 18 for infrared fluorescence may be selected using a solenoid or the like and slid into the optical path for insertion. When neither the visible fluorescence exciter filter 17 nor the infrared fluorescence exciter filter 18 is inserted, it is the same as when the through filter 16 is selected with the turret disk, and when any one of the filters 17 and 18 is selected. The same effect as when the corresponding filters 17 and 18 are selected by the turret disk can be obtained.

  Further, the turret disks 10 and 15 can be integrated by integrating the ring slit and the illumination filter in accordance with various photographing modes. An example of this is shown in FIG. The turret has three standard ring slits 11, two small pupil ring slits 12, and one fluorescent ring slit 13 arranged around the circumference. Among these, one standard ring slit and one for small pupils are arranged. The visible fluorescence exciter filter 17 is fixed to the ring slit, and the standard ring slit and the small pupil ring slit are integrated with the visible fluorescence exciter filter ((b), (c)). In addition, an infrared fluorescence exciter filter 18 is fixed to one standard ring slit and a fluorescence ring slit, and the standard ring slit and the fluorescence ring slit are integrated with the infrared fluorescence exciter filter ((e), (F)).

  In such a configuration, in the case of the upper mydriatic imaging shown in FIG. 3, the standard ring slit at the position shown in FIG. 4A is selected, and in the case of the second visible fluorescence imaging, The standard ring slit in which the exciter filter for visible fluorescence at the position (c) is integrated is selected, and in the case of the third infrared fluorescent photographing, the exciter filter for infrared fluorescence at the position (f) is integrated. In the case of the fourth non-mydriatic photographing and the fifth mydriatic photographing, the small pupil ring slit at the position (d) is selected, and the sixth visible fluorescent photographing is selected. In this case, a ring slit for a small pupil in which an exciter filter for visible fluorescence at the position (b) is integrated is selected. In the case of the seventh infrared fluorescence photography, infrared fluorescence at the position (e) is selected. Fluorescent ring sleeve with integrated exciter filter Doo is selected, each of which is inserted into the optical path. In this example, since the corresponding ring slit and exciter filter are integrated, the selection mechanism can be simplified and the operability can be improved.

  FIG. 5 illustrates another embodiment of the present invention. This embodiment is different from the embodiment of FIG. 1 in the configuration of the ring slit and the illumination filter, and is different in that the infrared CCD camera for observation and photographing is used in common. Since other parts are the same, the same or similar parts in the embodiment of FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the case of the embodiment of FIG. 5 as well, the standard ring slit 61, the small pupil ring slit 62, and the fluorescent ring slit 63 are arranged on the turret disk in the same manner as in FIG. 1, or by rotating the turret disk, or Any one of them can be inserted into the optical axis by using a slide mechanism or the like arranged on a straight line.

  As shown in detail in FIG. 6, each ring slit is composed of a lens and a plurality of diaphragms. The standard ring slit 61 includes a lens 61 a and a ring slit 61 b (for example, an outer diameter = 16 mm, an inner diameter = 8 mm), It is composed of a circular aperture stop 61c (for example, diameter = 12 mm) and a ring slit 61d (for example, outer diameter = 16 mm, inner diameter = 8 mm). These elements 61a, 61b, 61c, 61d are unitized as a unitary structure. Yes. The small pupil ring slit 62 includes a lens 62a, a ring slit 62b (for example, outer diameter = 13 mm, inner diameter = 7 mm), a circular aperture stop 62c (for example, diameter = 10 mm), and a ring slit 62d (for example, outer diameter = 13 mm). , The inner diameter = 7 mm), and these elements 62a, 62b, 62c, 62d are also integrated and unitized. The fluorescent ring slit 63 includes a lens 63a (for example, diameter = 18 mm) and a ring slit 63c (for example, outer diameter = 16 mm, inner diameter = 2 mm), and an infrared fluorescent exciter filter 46 (the embodiment of FIG. 1). Corresponding to the infrared fluorescence exciter filter 18), and similarly, each of the elements 63a, 63c, and 46 has a unitary structure and is unitized.

  Further, the ring slit 61b of the standard ring slit 61 and the ring slit 62b of the small pupil ring slit 62 are arranged at the corneal conjugate position, and at the corneal conjugate position of the fluorescent ring slit 63, the diaphragm effect by the lens barrel is obtained. As a result, a circular aperture stop is formed. Therefore, in the diaphragm configuration at this corneal conjugate position, the outer diameter and inner diameter of the ring slit 62b are smaller than the outer diameter and inner diameter of the ring slit 61b, respectively, and are formed at the corneal conjugate position of the fluorescent ring slit 63. Since the circular aperture stop is substantially the same as the diameter of the lens 63a, the illumination light quantity (transmission light quantity) passing through the circular aperture stop is larger than that of the ring slit 61b.

  In addition, the circular aperture stop 61c of the standard ring slit 61, the circular aperture stop 62c of the small pupil ring slit 62, and the ring slit 63c of the fluorescent ring slit 63 are respectively arranged at the pupil conjugate position. In a certain aperture configuration, the diameter of the circular aperture stop 62c is smaller than the diameter of the circular aperture stop 61c, and the amount of illumination light (transmitted light amount) passing through the ring slit 63c is larger than that of the circular aperture stop 61c. It has become.

  Further, the ring slit 61d of the standard ring slit 61 and the ring slit 62d of the small pupil ring slit 62 are arranged at the lens conjugate position, and at the lens conjugate position of the fluorescence ring slit 63, the diaphragm effect by the lens barrel is obtained. As a result, a circular aperture stop is formed. Therefore, in the diaphragm configuration at this lens conjugate position, the outer diameter and inner diameter of the ring slit 62d are smaller than the outer diameter and inner diameter of the ring slit 61d, respectively, and formed at the lens conjugate position of the fluorescent ring slit 63. Since the circular aperture stop is almost the same as the diameter of the lens 63a, the illumination light quantity (transmission light quantity) passing through the circular aperture stop is larger than that of the ring slit 61d.

  In the embodiment of FIG. 5, the through filter 16 of the embodiment of FIG. 1 is omitted because it is substituted by the lenses 61a, 62a, 63a, and the exciter filter 17 for visible fluorescence of the embodiment of FIG. In the embodiment of FIG. 5, the exciter filter for visible fluorescence 45 is inserted and removed between the lens 4 and the mirror 5, and the exciter filter for infrared fluorescence 18 of the embodiment of FIG. In the example, as described above, the exciter filter 46 for infrared fluorescence is integrated and arranged in the ring slit 63 for fluorescence.

  In such a configuration, the standard ring slit 61, in the mydriatic, non-mydriatic, visible fluorescence, and infrared fluorescence imaging modes, respectively, according to the table shown in FIG. The small pupil ring slit 62, the fluorescence ring slit 63, the visible fluorescence exciter filter 45, and the infrared fluorescence exciter filter 46 are selected, and the fundus is observed and photographed. At that time, the relationship between the transmitted light amounts of the illumination light diaphragms is the same as that in FIG. 1, so that the same effect as in the embodiment of FIG. 1 can be obtained.

  Further, in the photographing optical system in the embodiment of FIG. 5, the infrared CCD 35 for observation and the infrared CCD 37 for photographing in the embodiment of FIG. 1 are one infrared CCD 51 functioning as an observation photographing unit for infrared light. It has become. Therefore, the infrared CCD 51 can be used for both observation and photographing, so that the configuration is less expensive than the embodiment of FIG. In this case, since the sensitivity of the infrared CCD 51 needs to be changed depending on whether it is used for observation or when it is used for photographing, a gain switching circuit 52 is provided. Is switched from the setting value for observation to the setting value for photographing in synchronization with the shutter operation, and the sensitivity is set to a lower gain value than that at the time of observation. Further, at the time of observation, the sensitivity of the infrared CCD 51 is preferably increased, and in that case, the sensitivity setting value (gain) is preferably made variable in accordance with each photographing mode.

  Further, when the fundus still image information is recorded in association with the shooting time information, a preferable result is obtained. Therefore, a timer 54 used for fluorescent shooting is connected to the recording unit 53 for recording a still image, and the time of shooting is set to the timer. 54, and the fundus still image is recorded together with the photographing time.

It is a block diagram which shows the structure of the 1st Example of the ophthalmic imaging device concerning this invention. (A) is a front view of the turret disk which showed the mechanism which switches a ring slit, (B) is a front view of the turret disk which showed the mechanism which switches the filter for illumination. It is a table | surface figure which showed the use condition of the ring slit and the filter in various imaging | photography modes, the kind of observation means and imaging | photography means, etc. in the form of a table | surface. It is explanatory drawing which showed the other Example which switches a ring slit and the filter for illumination. It is a block diagram which shows the structure of the other Example of the ophthalmologic imaging device concerning this invention. It is an optical diagram which shows the detailed structure of the ring slit of the other Example of FIG.

Explanation of symbols

11 Standard ring slit 12 Ring slit for small pupil 13 Ring slit for fluorescence 17 Exciter filter for visible fluorescence 18 Exciter filter for infrared fluorescence 42 Barrier filter for visible fluorescence 43 Barrier filter for infrared fluorescence 45 Exciter filter for visible fluorescence 46 Infrared Exciter filter for fluorescence 61 Standard ring slit 62 Ring slit for small pupil 63 Ring ring slit for fluorescence

Claims (7)

An ophthalmologic photographing apparatus comprising: an illumination optical system that projects illumination light onto the fundus of an eye to be examined through a diaphragm; and a photographing optical system that photographs a fundus image illuminated with the illumination light,
An imaging filter having a wavelength characteristic as an infrared fluorescent filter, and inserted in the optical path of the imaging optical system;
An electronic imaging unit for infrared light for observing the fundus of the eye to be examined;
An electronic imaging device for visible light for taking a still image of the fundus of the eye to be examined,
When photographing a still image using the visible light electronic imaging device, the photographing filter is inserted into and removed from the optical path of the photographing optical system according to the image information storage time of the visible light electronic imaging device. An ophthalmologic photographing apparatus characterized by. A first diaphragm, said first at least second diaphragm outside diameter is small relative to the diaphragm, and a third diaphragm the first transmitted light quantity of the stop is large, the illumination optical system by selecting ophthalmic imaging apparatus according to claim 1, characterized in that means for inserting the optical path is provided. The ophthalmologic photographing apparatus according to claim 2 , wherein the third diaphragm has a wavelength characteristic as an infrared fluorescence excitation filter. The illumination light filter having a wavelength characteristic as an infrared fluorescence excitation filter is inserted into the optical path of the illumination optical system when the third diaphragm is inserted into the optical path of the illumination optical system. ophthalmic imaging apparatus according to 2. When the third stop is inserted into the optical path of the illumination optical system, ophthalmologic photographing apparatus according to claim 3 or 4, wherein said imaging filter to be inserted into the optical path of the photographing optical system. The ophthalmic imaging apparatus according to claim 5 , wherein a wavelength range that transmits the imaging filter is different from a wavelength range that transmits the third diaphragm. The ophthalmic imaging apparatus according to claim 5 , wherein a wavelength range that transmits the imaging filter is different from a wavelength range that transmits the illumination light filter.

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