JP2006026097A - Fundus camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fundus camera allowing an examiner without skill in the examination to easily perform the operation for transferring the observation state from an anterior ocular segment observation state to a fundus oculi observation state. <P>SOLUTION: This fundus camera comprises a body part 8 in which a photography optical system 120 for photographing the anterior ocular segment and the fundus oculi is stored, a joystick 4 operated when a subject of the photography by the photography optical system 120 is changed from the anterior ocular segment to the fundus oculi, a monitor 11 for displaying an image photographed by the photography optical system 120, an optical axis angle changing mechanism 20 permitting the change of the angle of the optical axis O of the photography optical system 120 to the optical axis OE of an eye E to be examined, and a swing sensor 60 and a tilting sensor 70 for detecting that the optical axis O of the photography optical system 120 is superimposed on the optical axis OE of the eye E to be examined in observing the displayed anterior ocular segment. When it is detected that the optical axis O is superimposed on the optical axis OE, a swing center mark M1 and a tilting center mark M2 are displayed in the monitor 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fundus camera used for photographing a fundus image in the ophthalmic field.

  FIG. 5 shows an external configuration of a general fundus camera. The fundus camera 1 includes a base 2 and a mount 3 mounted on the base 2 so as to be slidable in the front-rear and left-right directions (horizontal direction). A joystick 4 is installed on the gantry 3, and the examiner can move the gantry 3 forward, backward, left and right on the base 2 by operating the joystick 4. In addition, an operation button 4a is disposed at the tip of the joystick 4, and a fundus image is captured by pressing the operation button 4a.

  A support column 5 is erected on the base 1, and a chin rest 6 a for placing the subject's chin, a forehead rest 6 b against which the subject's forehead abuts, and an eye E to be examined are fixed. An external fixation lamp 7 is provided as a light source for the purpose.

  On the gantry 3, a main body 8 (main body) for storing various optical systems and control systems of the fundus camera 1 is mounted. The control system may be provided inside the base 2 or the gantry 3. The main body portion 8 is provided with an objective lens portion 8a disposed to face the eye E, and an eyepiece portion 8b for the examiner to observe the eye E and the like. The main body portion 8 is connected to the gantry 3 via a joint portion 8c.

  The main body 8 can be swung vertically and horizontally on the gantry 3. Thereby, the observation range and imaging range of the eye fundus to be examined can be changed. Hereinafter, swinging the main body portion 8 in the vertical direction is referred to as “uplifting”, and swinging in the left-right direction is referred to as “swing”.

  The following Patent Document 1 has a main body having a photographing optical system for photographing the fundus as a configuration capable of raising and lowering the main body 8, and the optical axis of the photographing optical system is the optical axis of the eye to be examined. The main body is movably provided so that it can be set at an arbitrary angle with respect to the angle detection means for detecting the angle formed by the main body and the optical axis of the eye to be examined, and the angle detected by the angle detection means is displayed. By providing the display means, it is possible to know the angle of the main body with respect to the optical axis of the eye to be examined, and the fundus image can be taken again at the same angle.

  The main body 8 is connected to a still camera 9 for capturing a still image of the fundus of the eye E and an imaging device 10 such as a television camera for capturing a moving image of the fundus. The still camera 9 and the imaging device 10 are detachably connected to the main body unit 8. In particular, as the still camera 9, a digital camera equipped with a CCD, a film camera (for example, 35 mm), an instant camera, or the like is applied depending on the purpose of inspection. Further, when the still camera 9 and the imaging device 10 are of a digital imaging system, the image data can be transmitted and stored in an image recording device such as a computer provided outside the fundus camera.

  Furthermore, a monitor 11 that displays a fundus image of the eye E based on a video signal acquired by the imaging device 10 is provided on the examiner side of the main body 8. The monitor 11 is constituted by a thin (preferably light) type, for example, a liquid crystal monitor. As the monitor 11, for example, a touch panel monitor is used, and an XY coordinate system with the origin at the center of the screen is displayed superimposed on the fundus image, and coordinate values corresponding to the position touched on the screen are displayed. .

  FIG. 6 shows a general configuration of an optical system mounted on the fundus camera 1. The fundus camera 1 is provided with an illumination optical system 100 that illuminates the fundus oculi Ef of the eye E and an imaging optical system 120 for observing and photographing the illuminated fundus oculi Ef.

  The illumination optical system 100 includes a halogen lamp 101, a condenser lens 102, a xenon lamp 103, a condenser lens 104, exciter filters 105 and 106, a ring translucent plate 107, a mirror 108, a liquid crystal display 109, an illumination diaphragm 110, a relay lens 111, A perforated mirror 112 and an objective lens 113 are provided.

  The halogen lamp 101 is an observation light source that emits steady light (observation illumination light). The condenser lens 102 is an optical element that collects steady light emitted from the halogen lamp 101 and irradiates the eye E (especially the fundus oculi Ef) evenly. The xenon lamp 103 is a photographing light source that emits flash when photographing the fundus oculi Ef. The condenser lens 104 is an optical element that collects flash light (imaging illumination light) emitted from the xenon lamp 103 and irradiates the fundus oculi Ef evenly.

  The exciter filters 105 and 106 are used when performing fluorescence photographing of the fundus image of the fundus oculi Ef, and are inserted into and removed from the optical path by a solenoid (not shown). An exciter filter 105 is inserted on the optical path during FAG imaging, and an exciter filter 106 is inserted on the optical path during ICG imaging. Further, at the time of color photographing, both the exciter filters 105 and 106 are retracted from the optical path.

  The ring translucent plate 107 is disposed at a position conjugate with the pupil of the eye E to be examined, and includes a ring translucent portion 107a centering on the optical axis. The mirror 108 reflects illumination light emitted from the halogen lamp 101 and the xenon lamp 103 in the optical axis direction of the photographing optical system 120. The liquid crystal display 109 displays a fixation target for promoting fixation of the eye E.

  The illumination stop 110 is a stop member that blocks part of the illumination light in order to prevent flare and the like. The illumination stop 110 is configured to be movable in the optical axis direction, thereby changing the illumination area of the fundus oculi Ef. The perforated mirror 112 is an optical element that synthesizes the optical axis of the illumination optical system 100 and the optical axis of the photographing optical system 120, and has a hole 112a that is substantially centered on both optical axes. The objective lens 113 is provided in the objective lens portion 8 a of the main body portion 8.

  With such an illumination optical system 100, the fundus oculi Ef is illuminated as follows. When observing the fundus, the halogen lamp 101 is turned on, and the observation illumination light irradiates the ring translucent plate 107 through the condenser lenses 102 and 104. The light that has passed through the ring transparent portion 107 a of the ring transparent plate 107 is reflected by the mirror 108, passes through the liquid crystal display 109, the illumination stop 110, and the relay lens 111, and then the light of the photographing optical system 120 by the aperture mirror 112. Reflected in the axial direction and focused by the objective lens 113, the eye E is illuminated. Since the ring translucent plate 107 is conjugated to the pupil of the eye E to be examined, a ring translucent image of the observation illumination light is formed on the pupil, and the fundus reflection is extracted from the eye E through the central dark part. The fundus oculi Ef is observed based on the image.

  Further, at the time of fundus photographing, the xenon lamp 103 emits flash light and similarly illuminates the fundus oculi Ef. In the case of fluorescence photography, the exciter filter 105 or 106 is selectively placed on the optical path depending on whether FAG photography or ICG photography.

  The photographing optical system 120 includes an objective lens 113, a perforated mirror 112 (hole 112a), a photographing diaphragm 121, barrier filters 122a and 122b, a correction lens 123 (for anterior eye portion observation), a variable power lens 124, and a relay lens 125. The photographic lens 126 and the quick return mirror 127 are included. Reference numeral 9a represents a photographing medium (CCD, camera film, instant film, etc.) of the still camera 9.

  The photographing aperture 121 is composed of, for example, a disk-shaped member in which a plurality of light-transmitting portions having different sizes are formed, and each light-transmitting portion is selectively placed on the optical path by being rotated by a stepping motor or the like. It is arranged and the aperture value is changed. The aperture value of the shooting aperture 121 is changed according to the shooting mode (color shooting, FAG shooting, ICG shooting), observation magnification or shooting magnification (field angle), or observation depth or shooting depth.

  The barrier filters 122a and 122b can be inserted into and removed from the optical path by a solenoid or the like. The barrier filter 122a is inserted into the optical path during FAG imaging, and the barrier filter 122b is inserted into the optical path during ICG imaging. Further, during color photographing, the barrier filters 122a and 122b are both retracted from the optical path.

  The correction lens 123 is a lens that is inserted on the optical path when observing the anterior segment of the eye E (for example, during alignment). When observing or photographing the fundus oculi Ef, the correction lens 123 is retracted from the optical path. The correction lens 123 is inserted into and removed from the optical path by a solenoid or the like.

  The variable magnification lens 124 can be moved in the optical axis direction by a drive mechanism (not shown), and is used for changing the observation magnification and photographing magnification, and focusing the fundus image. The photographing lens 126 is a lens that forms an image of fundus reflected light from the eye E on the photographing medium 9a.

  The quick return mirror 127 is provided so as to be rotatable around a rotation shaft 127a. The quick return mirror 127 is obliquely provided on the optical path when observing the eye E, and reflects the fundus reflection light and guides it toward the eyepiece lens 130 (in this case, the switching mirror 129 is obliquely provided on the optical path. ). Further, when a moving image of the fundus is captured by the imaging device 10 and the moving image is displayed on the monitor 11 for observation, the switching mirror 129 is retracted from the optical path.

  When photographing the fundus with the still camera 9, the quick return mirror 127 is flipped upward so that the fundus reflection light is temporarily guided to the photographing medium 9a. Further, at the time of fundus photographing by the imaging device 10, the quick return mirror 127 is obliquely arranged on the optical path and reflects fundus reflected light upward.

  The photographing optical system 120 includes a field lens (field lens) 128, a switching mirror 129, an eyepiece lens 130, a relay lens 131, a reflection mirror 132, and a relay lens 133 that guide fundus reflected light reflected by the quick return mirror 127. Is provided.

  Similar to the quick return mirror 127, the switching mirror 129 is rotatable around the rotation shaft 129a. The switching mirror 129 is obliquely arranged on the optical path when observing the eye E, reflects the fundus reflection light, and guides it to the eyepiece lens 130.

  Further, at the time of photographing by the imaging device 10, the switching mirror 129 is retracted from the optical path, and the fundus reflection light is projected onto the imaging device (CCD) 10a via the relay lens 131, the mirror 132, and the relay lens 133. Further, the fundus image Ef ′ photographed by the imaging device 10 is displayed on the monitor 11.

  In general, when the fundus camera moves the gantry 3 forward (in the direction of the eye E) by operating the joystick 4 while observing the anterior segment image displayed on the monitor 11, the fundus camera automatically enters the fundus observation state. It is supposed to migrate. In the conventional fundus camera, the following problems have been pointed out with respect to a procedure (referred to as “driving”) for shifting from the anterior ocular segment observation state to the fundus observation state. That is, in the case where the body portion 8 is driven in a state where the body portion 8 is not raised or swung, the examiner can smoothly shift to the fundus observation state if the joystick 4 is tilted straight forward as it is. When the head is swinging, it is necessary to drive while maintaining the elevation angle and the swinging angle. Therefore, the head must be driven while finely adjusting the direction up, down, left and right while tilting the joystick 4 forward. Such an operation is easy for an examiner who is skilled in examination, but difficult for an examiner who is not yet skilled in examination. Therefore, there are many cases where it takes time for one driving operation, and the driving operation is forced to be performed again, so that not only the examiner but also the subject are forced to bear a heavy burden.

JP-A-5-329108 (Claim 2)

  The present invention has been made in view of such circumstances, and even an examiner who is not skilled in examination can easily perform a driving operation for shifting from the anterior ocular segment observation state to the fundus oculi observation state. An object is to provide a fundus camera.

  In order to achieve the above-mentioned object, the invention according to claim 1 switches a main body storing a photographing optical system for photographing the anterior segment and the fundus, and switches an object to be photographed by the photographing optical system from the anterior segment to the fundus. Switching operation means operated at times, display means for displaying an image photographed by the photographing optical system, and an optical axis angle changing mechanism capable of changing the angle of the optical axis of the photographing optical system with respect to a predetermined reference axis A fundus camera comprising: a detecting unit that detects that the optical axis of the imaging optical system is coincident with the reference axis when observing the displayed anterior eye part; and the optical axis by the detecting unit And coincidence information display means for displaying coincidence information when a coincidence with the reference axis is detected.

  In order to achieve the above object, the invention according to claim 2 is the fundus camera according to claim 1, wherein the display means and the coincidence information display means are composed of the same monitor. Features.

  In order to achieve the above object, the invention according to claim 3 is the fundus camera according to claim 1 or 2, wherein the photographing object is switched to the fundus by the switching operation means. And a control means for controlling the coincidence information display means so that the coincidence information is displayed in a smaller size than before switching.

  In order to achieve the above object, the invention according to claim 4 is the fundus camera according to claim 1 or 2, wherein the photographing object is switched to the fundus by the switching operation means. And a control means for controlling the match information display means so as to end the display of the match information.

  In order to achieve the above object, the invention according to claim 5 is the fundus camera according to claim 1 or 2, which is operated when the fundus image is captured by the photographing optical system. In response to the operation of the imaging operation means, the control means for controlling the matching information display means to display the matching information in a smaller size than before the operation. Features.

  In order to achieve the above object, the invention according to claim 6 is the fundus camera according to claim 1 or 2, which is operated when the fundus image is captured by the photographing optical system. An imaging operation means, and a control means for controlling the match information display means so as to end the display of the match information in response to the operation of the image pickup operation means.

  In order to achieve the above object, the invention according to claim 7 is the fundus camera according to claim 1 or 2, wherein the detecting means is used when observing the displayed anterior segment. And a notifying means for notifying that the coincidence between the optical axis and the reference axis is not detected.

  In order to achieve the above object, the invention according to claim 8 is the fundus camera according to any one of claims 1 to 7, wherein the optical axis angle changing mechanism is the main body. And a swing mechanism that supports the body so as to be pivotable in the horizontal direction, the reference axis is the optical axis of the eye to be examined, and the detection means And detecting that the main body is supported by the elevation mechanism and the swing mechanism so that the optical axis of the imaging optical system coincides with the optical axis of the eye to be examined.

  In order to achieve the above object, the invention according to claim 9 is the fundus camera according to any one of claims 1 to 7, wherein the optical axis angle changing mechanism is the main body. And an elevating mechanism for supporting the main body so as to have the same maximum rotation angle in the left and right directions relative to the swing center position. A swing mechanism, wherein the detection means detects that the body is supported at the elevation center position by the elevation mechanism, and the body is moved to the swing center position by the swing mechanism. Swinging detecting means for detecting that the main body is supported at the elevation center position by the elevation detection means. It is detected and, when it is detected that the main body is supported by the swing center position by the swing detection means, and displays the matching information, characterized in that.

  According to the present invention, in an examination by a fundus camera, if it is confirmed that matching information is displayed and then an operation for shifting from anterior ocular segment observation to fundus observation is performed, the operation becomes easy. Therefore, even an examiner who is not skilled in the examination using the fundus camera can easily perform the driving operation for shifting from the anterior ocular segment observation state to the fundus observation state.

  A preferred embodiment of a fundus camera according to the present invention will be described in detail with reference to the drawings. The fundus camera according to the present invention has the same external appearance configuration and optical system configuration as in the past. Hereinafter, an embodiment of the present invention will be described with reference to FIG. 5 for the external configuration and FIG. 6 for the configuration of the optical system.

  FIG. 1 shows a configuration of a fundus camera 1 of the present embodiment. The fundus camera 1 includes a base 2 and a gantry 3 mounted on the base 2 so as to be slidable in the front-rear and left-right directions, as in the prior art. A joystick 4 is installed on the rear side (right side in FIG. 1) of the gantry 3, and the examiner can move the gantry 3 forward, backward, left and right on the base 2 by operating the joystick 4. In addition, an operation button 4a is disposed at the tip of the joystick 4, and a fundus image is captured by pressing the operation button 4a.

  The main body 8 stores an optical system (illumination optical system 100, photographing optical system 120) as shown in FIG. The photographing optical system 120 is provided with a correction lens 123 (for anterior eye portion observation) that can be inserted into and removed from the optical path. On the back surface of the main body 8, a monitor 11 on which an image captured by the imaging optical system 120 is displayed is provided. The monitor 11 constitutes display means and coincidence information display means of the present invention.

  Here, in FIG. 1, the symbol O represents the optical axis of the photographing optical system 120. A symbol OE represents the optical axis of the eye E. The optical axis OE of the eye E corresponds to the reference axis in the present invention. The symbol Ep represents the center of the pupil of the eye E to be examined.

  Next, the main body 8 is supported on the gantry 3 and the angle of the optical axis O of the imaging optical system 120 with respect to the optical axis OE of the eye E can be changed. The optical axis angle changing mechanism 20 that enables the swing operation will be described. The optical axis angle changing mechanism 20 has the same configuration as a conventional fundus camera.

  The optical axis angle changing mechanism 20 includes a swing mechanism 30 that supports the main body 8 so as to be pivotable in the horizontal direction, and an elevation mechanism 40 that supports the main body 8 so as to be pivotable in the vertical direction. At the time of examination, the main body 8 is aligned so as to rotate about the pupil center Ep of the eye E to be rotated.

  The swing mechanism 30 includes a base 31 fixed on the gantry 3, a support arm 32 provided so that one end is fixed on the base 31 and the other end is disposed on the front side of the apparatus, and the support arm A column-shaped swing shaft portion 33 formed on the other end of the shaft 32 and the swing shaft portion 33 so as to rotate in the horizontal direction about the central axis R of the swing shaft portion 33 as a rotation axis. The horizontal rotation part 34 united is comprised.

  The head shaft 33 is formed at a position such that the center axis R passes through the pupil center Ep of the eye E after alignment. Moreover, the horizontal rotation part 34 can be rotated within the same angle range to the left and right with respect to a predetermined center position (swing center). In other words, the horizontal rotation unit 34 has the same maximum rotation angle in the right direction and maximum rotation angle in the left direction. Such limitation of the rotation angle is provided by providing stoppers on the outer peripheral surface of the swing shaft portion 33 and the inner peripheral surface (that is, both contact surfaces) of the horizontal rotation portion 34, for example. By the alignment, the swing center is (almost) coincident with the optical axis OE direction of the eye E to be examined.

  The elevation mechanism 40 includes a bending arm 41 and a guide member 42. One end of the bending arm 41 is fixed to the back surface of the horizontal rotating portion 34, and has a shape that is bent upward from there toward the device back surface direction. The curved arm 41 has a curvature that forms an arc centered on the pupil center Ep after alignment. That is, after alignment, the curved arm 41 (at least a part thereof) is formed in a shape that forms an arc centered on the pupil center Ep.

  The guide member 42 is composed of a plurality of members fixed to the side surface of the main body 8. Each member of the guide member 42 is disposed so as to come into contact with both side surfaces of the bending arm 41, and restricts the moving direction of the main body 8 with respect to the bending arm 41. Thereby, the main body 8 is configured to move along a circle centered on the pupil center Ep of the eye E with respect to the bending arm 41. The guide member 42 may be constituted by a guide rail or the like.

  Here, the main body 8 is rotatable with respect to the bending arm 41 within a range of the same angle up and down with a predetermined center position (elevation center) as a reference. In other words, the main body portion 8 has the maximum upward rotation angle and the maximum downward rotation angle equal. Such limitation of the rotation angle is provided by providing a convex stopper on the side surface of the bending arm 41, for example. The elevation center is a position where the optical axis O of the photographing optical system 120 is horizontal.

  The fundus camera 1 is provided with a gantry position sensor 50 that detects that the gantry 3 is at a predetermined position in the front-rear direction on the base. The gantry position sensor 50 includes a gantry side contact 51 fixedly arranged on the side surface of the gantry 3 and a base side contact 52 fixedly arranged on the side surface of the base 2. When the examiner tilts the joystick 4 forward and moves the gantry 3 forward, when the gantry 3 reaches a predetermined position in the front-rear direction, the gantry-side contact 51 and the base-side contact 52 come into contact with each other. Connected. Thereby, the gantry position sensor 50 detects that the gantry 3 has been moved to a predetermined position in the front-rear direction on the base 2.

  Further, the fundus camera 1 is provided with a swing sensor 60 that detects that the horizontal rotation unit 34 is located at the swing center with respect to the swing shaft portion 33. The swing sensor 60 is disposed on the first sensor 61 disposed on the notch surface 32a on the upper surface of the end portion of the support arm 32 on the front side of the apparatus, and on the notch surface 34a formed on the lower surface of the horizontal rotation unit 34. This is a position detection sensor including the second sensor 62. The position of the first sensor 61 is unchanged with respect to the swinging motion, and the second sensor 62 rotates to the left and right with the swinging motion. The second sensor 62 is disposed on the notch surface 34a so as to be positioned immediately above the first sensor 61 when the horizontal rotation unit 34 is positioned at the swing center, and thereby the neck The swing sensor 60 detects that the horizontal rotation unit 34 is positioned at the swing center. Note that a slight play may be given to the detection range of the swing center by the swing sensor 60. That is, even if the horizontal rotation unit 34 is slightly deviated from the swing center, it may be detected that it is the center. For this purpose, for example, the areas of the opposing surfaces of the first and second sensors 61 and 62 may be increased. The swing sensor 60 may be a contact type sensor or a non-contact type sensor.

  Further, the fundus camera 1 is provided with an elevation sensor 70 that detects that the main body 8 is located at the elevation center with respect to the bending arm 41. As with the above-described swing sensor 60, the elevation sensor 70 includes a first sensor 71 provided on the bending arm 41 and a second sensor 72 fixedly disposed on the side surface of the main body 8. It is a sensor. The position of the first sensor 71 is unchanged with respect to the elevation operation, and the second sensor 72 rotates up and down with the elevation operation. The second sensor 72 is disposed so as to be located immediately beside the first sensor 71 when the main body portion 8 is positioned at the elevation center. Detects that it is located at the supine center. In addition, you may give some play to the detection range of the elevation center by the elevation sensor 70.

  FIG. 2 shows the configuration of the control system of the fundus camera 1 of the present embodiment. The control system of the fundus camera 1 includes a control unit 80, a joystick 4 provided with an operation button 4a, a monitor 11, a head swing sensor 60, an elevation sensor 70, an audio output unit 90, and a correction lens on the optical path of the photographing optical system 120. A solenoid 123A for inserting and removing 123 is included.

  Here, the joystick 4 is the switching operation means of the present invention, the operation button 4a is the imaging operation means, the swing sensor 60 is the swing detection means, the elevation sensor 70 is the elevation detection means, the oscillation sensor 60 and the elevation sensor. Reference numeral 70 denotes detection means, and the audio output unit 90 constitutes notification means.

  The control unit 80 is a control unit of the present invention configured to include an arithmetic control device such as a CPU, and executes a computer program stored in a storage device such as a ROM or a hard disk drive (not shown) to execute the optical function of the fundus camera 1. The system (see FIG. 6) and each part of the control system are controlled. The control unit 80 is stored in the main body unit 8, the gantry 3, the base 2, and the like. Note that when a system configuration in which a computer apparatus is connected to the fundus camera 1 is employed, the CPU or the like of the computer apparatus may be used as the control unit 80.

  The audio output unit 90 includes an audio output circuit controlled by the control unit 80 and an audio output speaker.

  The solenoid 123 </ b> A is connected to the correction lens 123 for observing the anterior segment, and the correction lens 123 is inserted into and removed from the optical path of the photographing optical system 120 under the control of the control unit 80.

  An operation mode of the fundus camera 1 realized by such a control system will be described.

  In the examination by the fundus camera 1, first, the main body 8 is aligned with the eye E to be examined. Specifically, the joystick 4 is operated to move the main body unit 8 up and down and left and right so that the optical axis O of the imaging optical system 120 is aligned with the optical axis OE of the eye E and the joystick 4 is operated back and forth. Thus, the central axis R of the swing shaft portion 33 is aligned with the pupil position of the eye E to be examined. Thereby, the optical axis O of the photographing optical system 120 and the central axis R of the swinging shaft part 33 are arranged so as to be orthogonal to each other at the pupil center Ep of the eye E, and the horizontal rotating part 34 by the swinging mechanism 30 is arranged. That is, the swinging motion of the main body portion 8 (ie, the main body portion 8) and the raising / lowering motion of the main body portion 8 by the lifting / lowering mechanism 40 are respectively rotational operations about the pupil center Ep.

  When the alignment is completed, the examiner observes the anterior segment of the eye E to be examined. For this purpose, the control unit 80 turns on the halogen lamp 101 of the illumination optical system 110 to illuminate the eye E in accordance with a predetermined operation by the examiner, and controls the solenoid 123A to control the correction lens 123 with the imaging optical system. Insert into 120 optical paths. The imaging optical system 120 images the anterior ocular segment reflected light of the illumination light with the imaging device 10, and the imaging device 10 transmits the imaging result to the control unit 80 as a video signal. The control unit 80 transmits this video signal to the monitor 11 and causes the monitor 11 to display an image.

  The examiner observes the image E ′ of the anterior segment displayed on the monitor 11 as shown in FIG. At the time of observing the anterior segment, the examiner observes various portions of the anterior segment while raising and swinging the main body 8.

  At this time, when the swing sensor 60 detects that the main body 8 is positioned at the swing center, the control unit 80 receives the detection signal and displays the swing center mark M1 as shown in FIG. To display. Further, when the elevation sensor 70 detects that the main body 8 is positioned at the elevation center, the control unit 80 receives the detection signal and causes the monitor 11 to display the elevation center mark M2. The swing center mark M1 and the elevation center mark M2 constitute coincidence information according to the present invention.

  When the head sensor 60 or the elevation sensor 70 does not detect the center, that is, when the detection signal from these sensors is not received, a voice message such as “Please adjust to the center position when moving to fundus observation” You may control to output a beep sound from the audio | voice output part 90. FIG.

  Next, the examiner shifts from the anterior ocular segment observation state to the fundus oculi observation state while tilting the joystick 4 forward. At this time, the examiner confirms whether the swing center mark M1 and the elevation center mark M2 are displayed on the monitor 11, and then tilts the joystick 4 forward. When the gantry 3 is moved forward in response to an operation on the joystick 4, the gantry side contact 51 comes into contact with the base side contact 52, and a detection signal is transmitted from the gantry position sensor 50 to the control unit 80.

  When the control unit 80 receives the control signal from the gantry position sensor 50, the control unit 80 controls the solenoid 123A to retract the correction lens 123 from the optical path of the imaging optical system 120, thereby capturing the imaging optical system 120. The state is shifted to the fundus photographing state. At this time, the image displayed on the monitor 11 is also switched from the anterior eye image to the fundus image.

  Further, in response to receiving the detection signal from the gantry position sensor 50, the control unit 80 displays the swing center mark M1 and the elevation center mark M2 displayed on the monitor 11 with a small size as shown in FIG. The swing center mark M1 ′ and the elevation center mark M2 ′ are respectively changed. The swing center mark M1 'and the elevation center mark M2' are sized so as not to overlap the observation range (illumination range) of the fundus image Ef 'shown in a circle in FIG.

  In addition, instead of reducing the size of the swing center mark M1 and the like in this way, it is also possible to control to end the display of them.

  When fundus observation is performed on the monitor screen as shown in FIG. 4, the operation button 4 a of the joystick 4 is pressed to image the attention site of the fundus oculi Ef. Thus, fundus photographing with the fundus camera 1 is completed.

  According to such an operation mode of the present embodiment, the main body 8 is vertically moved so that the swing center mark M1 and the elevation center mark M2 are displayed on the monitor 11 when shifting from the anterior ocular segment observation to the fundus oculi observation. By adjusting the right and left inclination, the main body 8 can be easily adjusted to the swing center and the elevation center. Therefore, in order to shift from the anterior ocular segment observation to the fundus oculi observation (follow-up), it is only necessary to tilt the joystick 4 straight forward, so that even the examiner who is not skilled in the examination using the fundus camera can easily perform the follow-up operation. Can be performed.

  Since the swing center mark M1 and the elevation center mark M2 are displayed on the monitor 11 together with the image E ′ of the anterior eye part, the examiner observes the image E ′ of the anterior eye part while observing the image E ′ of the anterior eye part. It is convenient because it can be easily recognized whether or not is located at the center.

  Further, when the main body part 8 is not located at the center during the anterior ocular segment observation, it is configured to notify that effect by voice. You can bring it to the center without forgetting it. Note that the configuration for notifying that the main body unit 8 is not located at the center is not limited to audio output, and any configuration such as display on the monitor 11 or lighting / flashing of the LED can be applied. Is possible.

  Further, in response to the shift from the anterior ocular segment observation to the fundus oculi observation, the swing center mark and the elevation center mark (also simply referred to as a mark) displayed on the monitor 11 are reduced and displayed in a size that does not overlap the fundus image. The Therefore, even if the mark is displayed, the fundus observation is not disturbed. In the configuration in which the mark display is terminated in response to the shift to fundus observation, similarly, the fundus observation is not obstructed, and even if the display image of the monitor 11 is recorded as it is, the mark is reflected in the recorded image. There is no advantage.

[Modification]
The configuration described in detail above is merely an example for implementing the fundus camera of the present invention, and various modifications can be made within the scope of the gist of the present invention.

  For example, when shifting from anterior ocular segment observation to fundus oculi observation, it is not necessary to reduce the size of the mark displayed on the monitor 11 or to end the display of the mark, and the fundus image is captured by pressing the operation button 4a. Sometimes the size may be reduced or the display may be terminated. Then, when the display image of the monitor 11 is recorded as it is, the mark does not overlap with the fundus image displayed on the recording image, so that a good recording image can be obtained.

  Further, as a display mode of the coincidence information of the present invention, instead of displaying the swinging mark and the lifting / lowering mark separately as in the above-described embodiment, for example, both the center of the swinging and the lifting / lowering are matched. A single mark may be displayed at the same time.

  In addition, regarding the display mode (size and display end) of the mark at the time of switching from anterior ocular segment observation to fundus oculi observation or at the time of fundus image capture, for example, the mark color is changed or the mark is displayed in a hollow state. May be.

  Further, the display means and the coincidence information display means of the present invention do not need to be configured from the same monitor, and may be configured from separate monitors. In addition to the monitor device, the coincidence information display means can use an LED, a lamp, or the like. In this case, the coincidence information is “LED lighting”, that is, light.

It is a side view showing an example of composition of an embodiment of a fundus camera concerning the present invention. It is a block diagram showing an example of composition of a control system of an embodiment of a fundus camera concerning the present invention. It is the schematic for demonstrating an example of the display screen by embodiment of the fundus camera which concerns on this invention. It is the schematic for demonstrating an example of the display screen by embodiment of the fundus camera which concerns on this invention. It is a side view showing an example of the appearance composition of a fundus camera. It is a figure showing an example of composition of an optical system of a fundus camera.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fundus camera 2 Base 3 Base 4 Joystick 4a Operation button 8 Main part 11 Monitor 20 Optical axis angle changing mechanism 30 Swing mechanism 31 Base 32 Support arm 33 Swing shaft part 34 Horizontal rotating part 40 Lifting mechanism 41 Bending arm 42 Guide Member 50 gantry position sensor 60 swing sensor 70 elevation sensor 80 control unit 90 audio output unit 120 photographing optical system 123 correction lens 123A solenoid E eye to be examined Ef fundus Ep pupil center O optical axis OE of imaging optical system optical axis R of eye to be examined Center axis M1, M1 'of swing shaft part Swing center mark M2, M2' Lifting center mark

Claims (9)

A main body storing a photographing optical system for photographing the anterior eye part and the fundus, switching operation means operated when the photographing object by the photographing optical system is switched from the anterior eye part to the fundus, and photographed by the photographing optical system. A fundus camera comprising: display means for displaying an image; and an optical axis angle changing mechanism capable of changing an angle of the optical axis of the photographing optical system with respect to a predetermined reference axis,
Detecting means for detecting that the optical axis of the imaging optical system coincides with the reference axis at the time of observing the displayed anterior segment;
Coincidence information display means for displaying coincidence information when coincidence between the optical axis and the reference axis is detected by the detection means;
A fundus camera characterized by comprising:   The fundus camera according to claim 1, wherein the display unit and the coincidence information display unit include the same monitor.   And a control means for controlling the coincidence information display means so that the coincidence information is displayed in a smaller size than before the change when the photographing object is switched to the fundus by the switching operation means. The fundus camera according to claim 1 or 2.   2. The control device according to claim 1, further comprising a control unit that controls the coincidence information display unit so as to end the display of the coincidence information when the photographing object is switched to the fundus by the switching operation unit. The fundus camera according to claim 2. Imaging operation means operated when imaging the fundus image by the imaging optical system;
In response to the operation of the imaging operation means, a control means for controlling the coincidence information display means to display the coincidence information in a smaller size than before the operation,
The fundus camera according to claim 1, wherein the fundus camera is provided. Imaging operation means operated when imaging the fundus image by the imaging optical system;
In response to the operation of the imaging operation means, a control means for controlling the match information display means to end the display of the match information;
The fundus camera according to claim 1, wherein the fundus camera is provided.   2. An informing means for informing that the coincidence between the optical axis and the reference axis is not detected by the detecting means during observation of the displayed anterior eye part. The fundus camera according to claim 2. The optical axis angle changing mechanism includes an elevating mechanism that supports the main body so as to be rotatable in a vertical direction, and a swing mechanism that supports the main body so as to be rotatable in a horizontal direction.
The reference axis is the optical axis of the eye to be examined;
The detection means detects that the main body is supported by the elevation mechanism and the swing mechanism so that the optical axis of the imaging optical system coincides with the optical axis of the eye to be examined;
The fundus camera according to any one of claims 1 to 7, wherein the fundus camera is provided. The optical axis angle changing mechanism includes an elevating mechanism that supports the main body so as to have the same maximum rotation angle in the vertical direction with respect to the elevation center position, and a maximum that is equal to the left and right with respect to the swing center position. A swing mechanism that supports the pivot angle so as to have a rotation angle,
The detecting means detects that the body is supported at the elevation center position by the elevation mechanism, and the body is supported at the swing center position by the swing mechanism. Swing detection means for detecting
The coincidence information display means detects that the body is supported at the elevation center position by the elevation detection means, and the body is supported at the swing center position by the swing detection means. Display the match information when it is detected that
The fundus camera according to any one of claims 1 to 7, wherein the fundus camera is provided.

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