JP2006075449A - Ophthalmic imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ophthalmic imaging apparatus capable of performing the stereoscopic photographing and monocular photographing of an eyeground with a simple optical configuration and efficiently managing an image. <P>SOLUTION: The image of the eyeground 1a in an eye to be examined is formed in the neighborhood of a field diaphragm 35. The eyeground image is formed in an observation CCD (charge coupled device) 40 by a lens 37, so as to be observed on a monitor 41. The image is formed in a photographing CCD 53 by variable power lenses 47a, 47b, so as to photograph the eyeground image. In the case of the stereoscopic photographing, two-hole diaphragms 50 and a division prism 51 are inserted. Linked with the insertion, the lens 47b of high power and a stereoscopic field diaphragm 39 are inserted into an optical path. The stereoscopic photographing and the monocular photographing of the eyeground are made to be possible by simple optical adjustment by using a same imaging means in such a configuration. The two images required for the stereoscopic photographing are obtained in one-time photographing, so that the image is efficiently managed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an ophthalmic imaging apparatus, and more particularly to an ophthalmic imaging apparatus capable of monocular imaging and stereoscopic imaging of the fundus.

  Conventionally, stereoscopic fundus cameras that divide reflected light from the fundus that is incident through an objective lens, and image a pair of left and right fundus images by imaging the divided light beams with a pair of imaging optical systems are known. (Patent Document 1).

Also, a fundus camera (Patent Document 2) that provides an infrared filter that transmits infrared light in the illumination optical path and enables stereoscopic imaging of the fundus with a non-mydriatic eye, the left and right positions of the divided luminous flux are switched, and the fundus image A fundus camera capable of stereoscopic viewing upright (Patent Document 3), a fundus camera capable of binocular photography and monocular photography with a single unit by inserting and removing a plurality of aperture stops for stereoscopic viewing at the position of the pupil conjugate (Patent Document 4), A stereoscopic fundus camera (Patent Document 5) that can vary the width of the two apertures for stereoscopic vision of the pupil conjugate diaphragm in accordance with the size of the pupil and expose the fundus with a constant amount of light, and a cylindrical lens for stereoscopic photography. There is known a fundus camera (Patent Document 6), a fundus camera (Patent Document 7) that can vary the diaphragm of the fundus conjugate position and the pupil conjugate position, and can perform stereoscopic photography and monocular photography on the same video medium.
Japanese Utility Model Publication No.57-20169 Japanese Patent Laid-Open No. 6-114011 Japanese Patent Laid-Open No. 4-71528 JP-A-5-245109 Japanese Patent Laid-Open No. 2-5922 Japanese Patent Laid-Open No. 10-165372 Japanese Patent Laid-Open No. 11-299739

  However, conventional fundus cameras capable of stereoscopic shooting require a dedicated camera for a stereoscopic camera or a dedicated imaging device for stereoscopic shooting, or are difficult to align because stereoscopic shooting is generally performed at a high magnification. There is a problem that a switching mechanism for a ring slit or a perforated mirror is required only for the purpose of ensuring parallax for stereoscopic shooting.

  Further, conventionally, since it is necessary to arrange lenses in two right and left optical paths for stereoscopic photography, there is a problem that not only the cost is increased but also the optical adjustment is complicated and the adjustment takes time.

  The present invention has been made to solve such problems, and provides an ophthalmologic photographing apparatus capable of performing three-dimensional photographing and monocular photographing of the fundus with a simple optical configuration and capable of efficient image management. Let it be an issue.

The ophthalmologic photographing apparatus of the present invention is
A first optical system that includes a lens that can move along the optical axis in order to correct a shift in the imaging position due to individual differences in the diopter of the eye to be examined, and that forms an image of the fundus of the eye to be examined in the vicinity of the field stop;
A second optical system that re-images a fundus image formed in the vicinity of the field stop at at least two different magnifications;
A third optical system that re-images the fundus image formed in the vicinity of the field stop in a different optical path from the second optical system;
Imaging means arranged at a re-imaging position of the fundus image by the second optical system;
Observation means arranged at a re-imaging position of the fundus image by the third optical system;
A splitting optical element for splitting a light beam for stereoscopic shooting, which is detachably disposed in the optical path of the second optical system;
It is provided with.

  In the present invention, it is possible to perform stereoscopic imaging and monocular imaging of the fundus with the same imaging means with simple optical adjustment, and two images necessary for stereoscopic imaging can be obtained by one imaging, so that an efficient image can be obtained. Can be managed.

  The present invention is an ophthalmologic photographing apparatus capable of performing stereo photographing for stereoscopic viewing by one photographing using the same image sensor (imaging means) as monocular photographing, and the present invention will be described in detail below with reference to the accompanying drawings. .

  FIG. 1 shows a first embodiment of the present invention. In this embodiment, the ophthalmologic photographing apparatus is configured as a non-mydriatic fundus camera.

  In the ophthalmologic photographing apparatus shown in FIG. 1, the apparatus main body 10 is provided with an illumination optical system that illuminates the fundus and an imaging optical system that forms an image of the illuminated fundus. In the illumination optical system, the light emitted from the light source 11 such as a halogen lamp and the light reflected by the concave mirror 12 become infrared light through the visible cut infrared transmission filter 13, pass through the strobe 14, and enter the diffusion plate 15. The ring slit 16 that is incident and diffused and disposed at a position conjugate with the anterior eye portion (pupil) 1 b of the eye 1 to be examined is illuminated. The illumination light from the ring slit 16 passes through the lens 17, the black dot plate 18 for removing the reflection of the objective lens 22, the half mirror 19, and the relay lens 20, and a perforated total reflection mirror 21 having a hole in the center. Then, the light passes through the objective lens 22 and is incident on the fundus 1a from the anterior eye portion 1b of the eye 1 to be illuminated. The fundus 1a is illuminated with infrared light. The ring slit 16 is replaced with an illumination stop (binocular stop) 16 'for stereoscopic viewing during stereoscopic shooting.

  The reflected light from the fundus 1a is received through the objective lens 22, passes through the hole of the perforated total reflection mirror 21, and enters the photographing aperture 31 and the focus lens 32. The focus lens 32 is movable along the optical axis, and corrects the shift of the fundus imaging position due to individual differences in the eye diopter. The fundus image subsequently passes through the imaging lens 33, is reflected by the half mirror 34, and enters the infrared transmission visible reflection mirror 36 via the field stop 35 disposed at a position conjugate with the fundus 1a.

  As shown in FIG. 3A, the field stop (first field stop) 35 includes a light shielding portion 35a and a circular opening 35b. A (second field stop) 39 can be inserted into the optical path. As shown in FIG. 3B, the stereoscopic field stop 39 includes a light-shielding portion 39a, a region 39b having a circular outer periphery that transmits only infrared light, and a hollow through that transmits light in all wavelength regions. The outer periphery of the region 39b has the same size as the outer periphery of the circular opening 35b of the field stop 35. When the stereoscopic field stop 39 is inserted into the optical path coaxially with the field stop 35, the outer periphery of the region 39 b of the stereoscopic field stop 39 coincides with the outer periphery of the circular opening 35 b of the field stop 35.

  Returning to FIG. 1, the infrared light transmitted through the infrared transmission visible reflection mirror 36 is reflected by the mirror 38, passes through the imaging lens 37, and is configured by an infrared CCD having sensitivity to the infrared light. The light is incident on the image pickup means (image pickup element) 40 and the signal is input to the monitor 41.

  Further, the visible light reflected by the mirror 36 is received by an imaging means 53 including a visible CCD having sensitivity to visible light via at least two kinds of variable magnification lenses 47a and 47b, and imaging is performed. The fundus image picked up by the means 53 can be stored in the memory 54, and is taken into an external personal computer (not shown), displayed on the monitor 41, or output to a printer (not shown).

  In the optical path to the image pickup means 53, a three-dimensional photographing light beam splitting element (light beam splitting means) including a two-hole aperture 50 and a split prism 51 is detachably disposed after the variable magnification lens. The insertion position is set so that the insertion position of the two-hole aperture 50 is in the vicinity of a position conjugate with the anterior eye portion to be examined. As shown in FIG. 3C, the two-hole aperture 50 is a multi-aperture aperture having two apertures 50a and 50b, and a light beam enters the split prism 51 via the two-hole aperture 50. The fundus image is divided into two to enable stereoscopic shooting. When the two-hole aperture 50 and the split prism 51 are inserted in the optical path for stereoscopic shooting, the low-magnification zoom lens 47a is switched to the high-magnification zoom lens 47b in conjunction with the two-hole aperture 50 and the split prism 51. A field stop 39 is inserted into the optical path.

  The two-hole aperture 50 and the split prism 51 are illustrated so as to split the light beam vertically in the drawing, but actually split in the left-right direction (direction perpendicular to the paper surface). However, since it is difficult to illustrate the state in which the light beam is split in the left-right direction in the drawing, in FIG. 1, the two-hole aperture 50 and the split prism 51 are as viewed from a direction perpendicular to the paper surface for convenience. Is shown. Such illustration also applies to FIGS. 2, 4 and 5 below.

  In such an imaging optical system, the position conjugate to the fundus la of the eye 1 to be examined is indicated by R, and the position conjugate to the anterior eye part (particularly the pupil) is indicated by P. The field stop 35 is an objective lens. 22, a focus lens 32, an imaging lens 33, and the like, which are arranged at the fundus conjugate position with respect to the optical system (first optical system). In addition, the imaging surface of the imaging means 40 is at a position conjugate with the field stop 35 with respect to the imaging lens 37 (third optical system), and the imaging surface of the imaging means 53 is a variable magnification lens 47a, 47b (first lens). 2 is arranged at a position conjugate with the field stop 35, the fundus image of the field stop 35 is re-imaged by the imaging lens 37 and the variable power lenses 47a and 47b, and is picked up by the imaging means 40 and the like. The fundus image by the observation means configured It is possible to observe, by the imaging means 53, can be photographed fundus image.

  In such a configuration, since the visible cut infrared transmission filter 13 is inserted in the illumination optical path, the fundus is illuminated with infrared light, and the fundus image is reduced by the objective lens 22, the focus lens 32, and the imaging lens 33. An image is formed at the position 35. Since the fundus image of the field stop 35 is transmitted through the infrared transmission visible reflection mirror 36 and re-imaged on the imaging surface of the imaging means 40 by the imaging lens 37, the fundus image is displayed on the monitor 41 as a monochrome image, The examiner can observe the fundus image with a non-mydriatic via the monitor 41.

  The illumination optical system is provided with a focus dot light source 30, and a light beam from the light source 30 is incident on the fundus 1 a via the half mirror 19, and the focus dot position changes according to the movement of the focus lens 32. The examiner can focus on the eye to be examined by observing the focus dot. Further, since the anterior segment lens 42 is inserted in the initial stage of alignment, the examiner can confirm the image of the anterior segment 1b of the eye 1 to be examined on the monitor 41. In the alignment or focusing operation, one of the LED light sources 43a of the internal fixation lamp 43 including the plurality of LED light sources 43a is turned on, and the examiner causes the subject to gaze at the fixation lamp. Alignment and focusing operations can be ensured.

  When the alignment is completed, the shutter switch 46 is operated, the shutter operation signal is input to the imaging means 53 and the memory 54, the imaging means 53 is activated, and the operation for capturing the still image of the fundus is started. Since a signal for instructing light emission is transmitted from the imaging means 53 to the strobe 14 in synchronization with the operation signal, the strobe 14 emits light. The fundus image illuminated by the light emission of the strobe 14 is once formed at the position of the field stop 35 and then re-imaged on the image pickup surface of the image pickup means 53 by the zoom lens 47a. Captured as a still image.

  The still image picked up by the image pickup means 53 is stored in the memory 54 and is taken into an external personal computer (not shown), displayed on the monitor 41, or output to a printer (not shown). Alternatively, the memory 54 itself can be configured as a cartridge so that it can be removed from the apparatus main body 10, and when the memory 54 is inserted into another device, the contents of the memory can be read by the device.

  Note that the fundus image can be zoomed with the zoom lenses 47a and 47b, and the images at that time are schematically shown as A and B in the upper right of FIG. A is a fundus image taken by the high-magnification zoom lens 47b, B is a fundus image taken by the low-magnification zoom lens 47a, and an image of the field stop drawn by oblique lines is also taken around the image. You can see that Thus, the examiner can identify an approximate photographing magnification by looking at the image of the field stop.

  Also, the image incident on the imaging means 40 arranged in the observation optical system has no zooming effect, and the examiner has black and white at the same magnification (preferably smaller than the magnification by the zooming lenses 47a and 47b) on the monitor 41. Observe the image. At this time, in order to facilitate alignment, the optical system (third optical system) reaching the imaging unit 40 so that the imaging unit 40 can capture an image C in a range wider than the range captured by the imaging unit 53. Set the magnification. As a result, the alignment by the imaging means 40 can always be performed at a wide angle regardless of the magnification of the variable magnification lens 47a (47b).

  The above is the case of monocular photography, but when performing stereoscopic photography, as shown in FIG. 2, the two-hole aperture 50 and the split prism 51 are inserted into the optical path of the second optical system. The insertion position of the two-hole aperture 50 is set in the vicinity of a position P conjugate with the anterior eye portion 1b to be examined after the zoom lens (47a, 47b). In conjunction with the insertion, a variable power lens 47b having a high magnification is inserted into the second optical system optical path as a variable power lens, and a stereoscopic field stop 39 is inserted in the vicinity of the field stop 35. As an illumination stop, a stereoscopic illumination stop 16 ′ is inserted in the optical path instead of the ring slit 16.

  When the stereoscopic field stop 39 is inserted into the optical path close to the field stop 35, the outer periphery of the region 39b of the stereoscopic field stop 39 coincides with the outer periphery of the circular opening 35b of the field stop 35, and the region 39b is infrared. Since only the light is transmitted, when viewed from the CCD 53 side sensitive to visible light, an effect of changing (reducing) the aperture of the field stop (35, 39) is provided, and it corresponds to a high magnification at the time of stereoscopic photographing. be able to. In this case, it is preferable that the aperture of the photographing aperture 31 disposed in the first optical system is variably, that is, enlarged in conjunction with the insertion of the two-hole aperture 50 and the split prism 51 into the optical path.

  The rectangular opening 39c of the stereoscopic field stop 39 has a rectangular opening when the fundus image is divided through the two-hole stop 50 and the dividing prism 51 and imaged at the position of the imaging means 53 by the variable power lens 47b. Since the image of the portion 39c is set to a size that is about half of the imaging range of the imaging means 53, as shown at A 'in the upper right of FIG. The left and right fundus images 1c and 1d are acquired by one imaging, and are recorded in the memory 54 and recorded and stored in an external recording device (not shown). As described above, two images necessary for stereoscopic viewing can be obtained by one photographing, so that the photographing speed is improved and the prevention of eye miosis is improved. In addition, the same image sensor 53 as that for monocular photography is used, and the screen that is one image for monocular photography is divided into two, and two images (1c, 1d) are used as one piece of image data as in the case of monocular photography. Can be recorded and stored in the recording device, so that efficient image management can be performed.

  The region 39b of the three-dimensional diaphragm 39 is a region that transmits only infrared light, and the rectangular opening 39c transmits the light flux in all bands, so that the image is picked up by the image pickup means 40 and displayed on the monitor 41. As shown by C in the upper right of FIG. 2, a rectangular outline 39d corresponding to the rectangular opening 39c is displayed in the observation image, and the examiner has an imaging range during stereoscopic imaging. Can be confirmed.

  Further, the left and right optical paths divided by the dividing prism 51 can form a fundus image on the image pickup means 53 by the variable power lens 47b without providing a lens, so that an inexpensive configuration and optical adjustment are easy. The effect of becoming is also obtained.

  The projection position of the fixation target is changed by selecting lighting of the LED light source 43a of the internal fixation lamp 43 in conjunction with the insertion of the two-hole aperture 50 and the split prism 51 into the optical path. The split prism 51 is made of two types of optical glass having different dispersions in order to suppress the occurrence of chromatic aberration.

  Further, whether or not the two-hole aperture 50 or the split prism 51 is inserted in the optical path indicates whether or not stereoscopic shooting is performed. Therefore, the insertion information is externally related to the image information of the fundus image captured as the imaging condition. The data is stored in the storage device.

  FIG. 4 shows a second embodiment of the present invention. In this embodiment, the ophthalmologic photographing apparatus is configured as a fundus camera capable of photographing in non-mydriatic, mydriatic, visible fluorescence, and infrared fluorescence modes. In addition, a filing device 150 and a video adapter 160 are connected to the main body 100 of the ophthalmologic photographing apparatus so that the video adapter 160 corresponds to stereoscopic photographing.

  In FIG. 4, the light beam from the observation light source 101 is condensed by the concave mirror 102, reflected by the mirror 105 through the strobe 103 and the condenser lens 104, and then passes through the relay lenses 120 and 121. Then, the light beam reflected by the perforated total reflection mirror 122 is imaged by the objective lens 123 at the pupil 1b of the eye 1 to be examined, and then enters the fundus 1a.

  In the optical path of the illumination optical system, an infrared transmission filter 106 is inserted after the observation light source 101 when there is no mydriasis, and a standard ring slit 111, a small pupil ring slit 112, a fluorescence ring are inserted by a turret disk 110. Either the slit 113 or the stereoscopic illumination stop 114 is inserted, and the turret disk 115 allows the through filter 116 to pass the blue light beam of 450 nm to 520 nm. The visible fluorescence exciter filter 117, the infrared light of 700 nm to 800 nm. Either an infrared fluorescent exciter filter 118 that transmits light or an infrared light cut visible light transmission filter 119 is inserted.

  The reflected light from the fundus 1a of the eye 1 to be examined again passes through the center of the pupil 1b and is received through the objective lens 123, passes through the hole of the perforated total reflection mirror 122, and is disposed in the optical path of the photographing optical system. It passes through the photographing aperture 124 and the focus lenses 125 and 126. The focus lens 126 is movable along the optical axis, and corrects a shift in the fundus imaging position due to individual differences in the eye diopter. The fundus image subsequently passes through the imaging lens 127 and enters the return mirror 130. The imaging lens 127 can be exchanged for an imaging lens 128 having a different magnification, thereby constituting a zooming mechanism. In addition, a barrier filter 142 is inserted between the photographing aperture 124 and the focus lens 125 in this photographing optical path in order to transmit visible fluorescence from the fundus during visible fluorescent photographing.

  Since the light flux from the fundus reflected by the return mirror 130 is reflected by the return mirror 131 and enters the eyepiece (finder) 132 constituting the naked eye observation optical system, the examiner observes the fundus image through the eyepiece 132. can do. Further, when the infrared transmission filter 106 is inserted and the return mirror 131 jumps up and leaves the optical path, the fundus image is reflected by the return mirror 133 via the field lens 154 and the field stop 155, and is infrared by the imaging lens 134. It is incident on an infrared CCD 135 as an imaging means having sensitivity to light.

  A fundus image is formed in the vicinity of the field stop 155, and this fundus image is re-imaged by the imaging lens 134 onto an infrared CCD 135 as observation means. The fundus image is displayed on the monitor 140 via the switching circuit 152 of the filing device 150 and also recorded on the recording device 153. Further, the fundus image of the infrared CCD 135 is also displayed on the monitor 141 built in the main body 100, so that the examiner can observe the fundus on the monitor 140, the monitor 141, etc., and perform alignment and focusing. .

  In addition, an infrared fluorescent barrier filter 143 that transmits infrared light of 820 nm to 900 nm can be inserted into the optical path between the return mirror 131 and the field lens 154 during infrared fluorescent photographing.

  When the return mirror 133 jumps up and leaves the optical path, the fundus image enters the video adapter 160, passes through the imaging lens 161, enters the dichroic mirror 162, and the dichroic mirror 162 causes visible light and infrared light. Are separated. The fundus image of visible light is formed in the vicinity of the field stop 163 by the imaging lens 161, and the fundus image of the field stop 163 is re-applied to the color CCD 136 as an imaging means having sensitivity to visible light by the imaging lens 166. Imaged. On the other hand, the fundus image of infrared light is focused on an infrared CCD 137 as an imaging means having sensitivity to infrared light by the imaging lens 161.

  Further, at the time of stereoscopic shooting, as shown in FIG. 5, a light beam splitting element composed of a two-hole aperture 167 and a splitting prism 168 is inserted into the optical path reaching the color CCD 136. In this case, the insertion position of the two-hole aperture 167 is set to be in the vicinity of a position conjugate with the anterior eye portion 1b to be examined, as in the first embodiment. In conjunction with the insertion of the two-hole aperture 167 and the split prism 168 into the optical path, the low-magnification imaging lens 166 is replaced with the high-magnification imaging lens 165, and the stereoscopic field aperture 164 is replaced with the field aperture 163. Inserted in close proximity.

  The field stop 163 is the same as the field stop 35 of the first embodiment, and includes a light shielding portion 163a and a circular opening 163b, as shown in FIG. As shown in FIG. 6B, the light blocking portion 164a and the rectangular opening 164b smaller than the circular opening 163b of the field stop 163 are formed. Further, the two-hole stop 167 is the same as the two-hole stop 50 of the first embodiment, and is a multi-aperture stop having two openings 167a and 167b as shown in FIG. Reference numeral 168 denotes the same as the splitting prism 51 of the first embodiment.

  With such a configuration, an image is formed near the field stop 155 by an optical system (first optical system) including the objective lens 123, the focus lenses 125 and 126, the variable magnification lens 127 (128), the field lens 154, and the like. The obtained fundus image is reflected by the return mirror 133 and re-imaged on the infrared CCD 135 as the observation means by the imaging lens 134 (third optical system), whereby the examiner uses the monitor 141 or the like to obtain the fundus image. , And alignment and focusing operations can be performed. Further, the fundus image formed in the vicinity of the field stop 155 is reconnected to the color CCD 136 by an optical system (second optical system) including an imaging lens 161, imaging lenses 165 and 166 having different magnifications, and the like. The fundus image is taken.

  In this case, since the fundus image captured by the color CCD 136 is an image reflected by the dichroic mirror 162, the fundus image is an inverted image of the fundus captured by the infrared CCD 137. Therefore, an image inversion circuit 151 is provided in the filing device 150, and the image inversion circuit 151 inverts one of the images from the color CCD 136 and the infrared CCD 137 so that the upper and lower sides of the observed image and the photographed image coincide with each other. To process. Since these CCDs 136 and 137 capture the fundus image obtained by the light emission of the strobe 103 at the time of shooting, the fundus still image is displayed on the monitor 140 via the switching circuit 152. Further, the filing device 150 is provided with a recording device 153 so that the fundus image captured by the CCDs 136 and 137 can be recorded in the recording device 153.

  When the return mirror 130 jumps up and leaves the optical path, the fundus image can be taken on a photographic film 144 such as a 35 mm film. It is also possible to take a fundus image using an image sensor equivalent to the color CCD 136 instead of this photographic film.

  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. It is performed by mydriatic photography and stereoscopic photography is possible.

  In the case of mydriatic imaging, the infrared transmission filter 106 is removed from the optical path, and the standard ring slit 111 or the small pupil ring slit 112 and the through filter 116 are inserted into the optical path. The return mirrors 130, 131, and 133 occupy the positions shown in the figure, and the examiner observes the fundus with the eyepiece 132, performs alignment such as alignment and focusing, and operates a shutter button (not shown). . The strobe 103 emits light in conjunction with the operation, and the return mirror 130 is then removed from the optical path, so that the fundus image is photographed on the film 144. Alternatively, the fundus can be photographed by the color CCD 136 with the return mirror 130 at the time of photographing and the return mirrors 131 and 133 detached from the optical path.

  In the case of non-mydriatic imaging, the infrared transmission filter 106 is inserted, and the small pupil ring slit 112 is inserted into the optical path. Further, the return mirror 131 jumps up and leaves the optical path, and at the time of observation, the observation with the monitor 140 or 141 by the infrared CCD 135 is different from the case of mydriatic imaging.

  At the time of visible fluorescent photographing, the standard or small pupil ring slits 111 and 112 and the visible fluorescent exciter filter 117 are inserted in the optical path, and observation is performed with the infrared CCD 135 or the eyepiece 132. The visible fluorescence barrier filter 142 is inserted into the optical path, and the strobe 103 is emitted as the visible fluorescence image is generated, and the visible fluorescence image is photographed by the 35 mm film 144. When the visible fluorescent image is captured by the color CCD 136, the return mirror 130 is inserted into the optical path, and the return mirrors 131 and 133 are separated from the optical path.

  At the time of infrared fluorescence imaging, the fluorescence ring slit 113 and the infrared fluorescence exciter filter 118 are inserted into the optical path, and observation is performed using the infrared CCD 135. At the time of imaging, the infrared fluorescence barrier filter 143 is used. Is inserted, and the shutter button is operated in accordance with the generation of the infrared fluorescent image. Thereby, the strobe 103 is emitted and the return mirror 133 jumps up, so that the infrared fluorescent image is transmitted through the dichroic mirror 162 and the infrared fluorescent image is captured by the infrared CCD 137.

  The above is a case of monocular photography. However, in the case of stereoscopic photography, as shown in FIG. 5, a two-hole aperture 167 and a split prism 168 are inserted in the optical path, and in conjunction therewith, an illumination aperture for stereoscopic vision. 114 and the infrared cut visible light transmission filter 119 are inserted into the optical path, and the imaging lens 166 previously inserted in the optical path is replaced with an imaging lens 165 having a higher magnification, and a stereoscopic field stop 164 is provided. Is inserted into the optical path close to the field stop 163.

  This stereoscopic photographing is possible when photographing is performed by the color CCD 136, that is, at the time of mydriatic, non-mydriatic photographing, and visible fluorescent photographing, and for stereoscopic viewing separated by the light beam splitting elements 167 and 168 by the color CCD 136. Left and right fundus images are acquired in a single shot. At this time, the rectangular opening 164b of the stereoscopic field stop 164 is approximately half the size of the imaging range when the fundus image is formed on the color CCD 136 as in the first embodiment. Therefore, the left and right fundus images 1c and 1d for stereoscopic viewing as shown by A ′ in the upper right of FIG. 2 are photographed and recorded in the recording device 153 of the filing device 150. In this way, since two images necessary for stereoscopic viewing can be obtained by one shooting, the speed of shooting is improved, the prevention of the eye miosis is improved, and the same image sensor 136 as in monocular shooting is used, Since one screen for monocular photography is divided into two and two images (1c, 1d) can be recorded and saved as one piece of image data in the same way as for monocular photography, efficient image management can be performed.

  In addition, since the fundus image can be formed on the imaging unit 136 without providing a lens in each of the left and right optical paths divided by the dividing prism 168, an inexpensive configuration and optical adjustment can be simplified. can get.

  As in the first embodiment, in conjunction with the insertion of the two-hole aperture 167 and the split prism 168 into the optical path, the projection position of the fixation target (not shown) is changed, or the aperture of the imaging aperture 124 is changed. Try to make it smaller. Similarly to the first embodiment, whether or not the two-hole aperture 167 or the split prism 168 is inserted in the optical path is recorded and stored in the storage device 153 in relation to the image information of the fundus image.

1 is an optical diagram showing a configuration of a first example of an ophthalmologic photographing apparatus. It is the optical figure which showed the optical arrangement | positioning at the time of three-dimensional photography in the 1st Example. (A) is a block diagram showing the structure of the field stop in the first embodiment, (B) is a block diagram of a stereoscopic field stop, and (C) is a block diagram of a two-hole stop. It is an optical diagram which shows the structure of the 2nd Example of an ophthalmic imaging device. It is the optical figure which showed the optical arrangement | positioning at the time of three-dimensional photography in the 2nd Example. (A) is the block diagram which showed the structure of the field stop in a 2nd Example, (B) is a block diagram of the field stop for solids, (C) is a block diagram of a 2 hole stop.

Explanation of symbols

31 Field stop 35 Field stop 39 Stereo field stop 47a, 47b Variable lens 50 2-hole aperture 51 Split prism 155, 163 Field stop 164 Stereo field stop 167 2-hole aperture 168 Split prism

Claims (12)

A first optical system that includes a lens that can move along the optical axis in order to correct a shift in the imaging position due to individual differences in the diopter of the eye to be examined, and that forms an image of the fundus of the eye to be examined in the vicinity of the field stop;
A second optical system that re-images a fundus image formed in the vicinity of the field stop at at least two different magnifications;
A third optical system that re-images the fundus image formed in the vicinity of the field stop in a different optical path from the second optical system;
Imaging means arranged at a re-imaging position of the fundus image by the second optical system;
Observation means arranged at a re-imaging position of the fundus image by the third optical system;
A splitting optical element for splitting a light beam for stereoscopic shooting, which is detachably disposed in the optical path of the second optical system;
An ophthalmologic photographing apparatus comprising:   The ophthalmologic photographing apparatus according to claim 1, wherein the split optical element is configured by a plurality of aperture stops and a split prism.   3. The ophthalmologic photographing apparatus according to claim 1, wherein a position at which the plurality of aperture stops are inserted into the optical path is in the vicinity of a position conjugate with the anterior eye portion to be examined.   The ophthalmologic photographing apparatus according to any one of claims 1 to 3, wherein the magnification of the second optical system is set to a predetermined magnification in conjunction with the insertion of the split optical element into the optical path. .   The ophthalmologic photographing apparatus according to any one of claims 1 to 4, wherein an opening of the field stop changes in conjunction with insertion of the divided optical element into an optical path.   The ophthalmologic according to any one of claims 1 to 5, wherein an aperture of a photographing diaphragm arranged in the first optical system changes in conjunction with insertion of the split optical element into an optical path. Shooting device.   The field stop is a first field stop having a circular opening, and a second field stop having a rectangular opening smaller than the circular opening is inserted into the optical path adjacent to the first field stop. The ophthalmologic photographing apparatus according to any one of claims 1 to 6, wherein   8. The rectangular opening of the second field stop is set to a size such that an image is formed with a size about half the imaging range of the imaging means. Ophthalmic photography device.   A region that transmits only infrared light is provided around the rectangular opening of the second field stop, and the infrared light that has passed through the region is incident on the observation means via a third optical system, and the region The ophthalmologic photographing apparatus according to claim 7, wherein an outer periphery of the ophthalmic imaging device is substantially equal in size to an outer periphery of the circular opening of the first field stop.   10. The ophthalmologic photographing apparatus according to claim 1, wherein the projection position of the internal fixation target changes in conjunction with the insertion of the divided optical element into the optical path.   The ophthalmologic according to any one of claims 2 to 10, wherein whether or not the plurality of aperture stops or the split prism is inserted in an optical path is recorded and stored in association with image information captured as a photographing condition. Shooting device.   The ophthalmologic photographing apparatus according to any one of claims 2 to 11, wherein the split prism is composed of two types of optical glasses having different dispersions in order to suppress the occurrence of chromatic aberration.

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