JP3382660B2 - Fundus camera - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fundus camera, and more particularly, to a gantry displaceable in the front-rear and left-right directions with respect to an eye to be examined, and an observation optical system for observing the eye to be examined. A main body capable of being displaced in the front-rear and left-right directions integrally with the gantry, and an auxiliary lens system capable of switching an observation state of the subject's eye by the observation optical system between a fundus observation state and an anterior eye part observation state. Retinal camera. 2. Description of the Related Art Conventionally, an auxiliary lens system is provided so as to be insertable into and removable from an optical path of an observation optical system, and when the auxiliary lens system is inserted into an optical path of the observation optical system, an anterior eye of an eye to be examined. There is a fundus camera that allows observation of a subject and enables observation or photographing of the fundus of the subject's eye when the auxiliary lens system is detached from the optical path. When such a fundus camera is used, first, an auxiliary lens system is inserted into an optical path of an observation optical system to perform alignment of the apparatus while observing an anterior ocular segment. The lens system is detached from the optical path to observe and photograph the fundus. And
Insertion / removal of the auxiliary lens system is performed by manual operation of an operation switch. [0004] Incidentally, in the fundus camera configured as described above, for example, when photographing the right and left fundus of the eye to be examined or photographing the fundus of a different subject. In such cases, after taking the fundus with the completion of the alignment operation, pull the gantry to the front, push the gantry forward again to perform alignment, and take a picture.
There is a problem that the number of operations of the operation switch for inserting / removing the auxiliary lens system is increased, so that the operation is very troublesome. [0005] The present invention has been made in view of the above circumstances,
Switching of the observation optical system of the state can be automatically performed, with it, Sui for switching the state of the observation optical system
A fundus camera that not only makes the alignment operation easier and reduces the time by eliminating the need for a switch operation, but also allows the examiner / subject to arbitrarily change the setting of the switching position. It is intended to do so. [0006] In order to achieve the object, the present invention comprises a gantry displaceable in the front, rear, left and right directions with respect to an eye to be examined, and an observation optical system for observing the eye to be examined. A fundus camera comprising: a main body capable of being displaced in the front-rear and left-right directions integrally with the gantry; and an auxiliary lens system capable of switching an observation state of the eye to be examined by the observation optical system between a fundus observation state and an anterior eye observation state. In, when the gantry is displaced in the front-back direction with respect to the subject's eye, the state of the auxiliary lens system is automatically changed to a fundus observation state and an anterior eye observation state at a predetermined position.
Provided with a switching means for switching, by said changeover switching means
A change means for changing a switching position at which the fundus observation state and the anterior eye part observation state are switched is provided . In such a configuration, when the gantry displaceable in the front-rear and left-right directions with respect to the subject's eye is displaced by a predetermined amount in the front-rear direction and reaches a switching position that can be arbitrarily changed, the switching means operates. As a result, the state of the auxiliary lens system is automatically changed, whereby the observation optical system for observing the subject's eye is automatically switched between the fundus observation state and the anterior eye part observation state. Next, an embodiment of a fundus camera according to the present invention will be described with reference to FIGS. (First Embodiment) FIGS. 1 to 5 show a first embodiment of the present invention. In FIG. 5, reference numeral 10 denotes an observation illumination optical system for illuminating the fundus Er of the subject's eye E, reference numeral 20 denotes a photographing illumination optical system sharing a part of the observation illumination optical system 10, and reference numeral 30 denotes each illumination optical system 10, 20. This is an observation / photographing optical system for forming an image of the fundus Er illuminated by using, and includes an imaging system 40, an observation system 50, and a photographing system 60. Reference numeral 70 denotes an index projection optical system for a focusing operation. The observation illumination optical system 10 includes an observation illumination light source 1.
1. Infrared filter 12 that cuts visible light and transmits only infrared light, condenser lens 13, inclined mirror 14 that transmits visible light and reflects infrared light, ring slit 1
5, a relay lens 16, a perforated mirror 17, and an objective lens 18;
The illumination light from No. 1 is projected on the fundus Er of the eye E to be examined. The photographing illumination optical system 20 includes a photographing illumination light source 2.
1, condenser lens 22, oblique mirror 14, ring slit 15, relay lens 16, perforated mirror 17,
The objective lens 18 is provided, and illumination light from the imaging illumination light source 21 is projected onto the fundus Er by these optical components. The imaging system 40 includes an objective lens 18, a hole 17a of the perforated mirror 17, an aperture 41 for passing only a light beam passing through the center of the pupil Ep of the eye E, and a half mirror 4.
2. A correction lens 43, a focusing lens 44, and an imaging lens 45 are provided as auxiliary lens systems. The correction lens 43 is inserted into the optical path as shown by the solid line in FIG. 5 during the alignment operation, and is retracted from the optical path as shown by the chain line in FIG. 5 during photographing. The operation of inserting and removing the correction lens 43 into and from the optical path is performed by automatic detection of automatic detection means described later. The observation system 50 includes a field lens 51, a relay lens 52, a reflection mirror 53, an image pickup tube 54, and a monitor 55. The monitor 55 has a correction lens 4
When the lens 3 is inserted in the optical path, the anterior segment image Ep ′ is displayed as shown in FIG.
Is retracted from the optical path, a fundus image Er ′ is displayed as shown in FIG. The photographing system 60 includes a flip-up mirror 61, a focal plane shutter 62, and a film 63.
Note that the shooting system 60 including the flip-up mirror 61, the focal plane shutter 62, and the film 63 is housed in a shooting / recording camera 84 described later. During observation, such as when performing an alignment operation or a focusing operation of the eye E to be inspected, the flip-up mirror 61 is inserted into the imaging optical path (indicated by the optical axis O1) indicated by a solid line in FIG. And the reflected light flux from the eye E is guided to the observation system 50. Further, when an image of the fundus Er is taken, the fundus E is located at a position retracted from the optical axis O1 shown by a chain line in FIG.
The image of r is photographed on the film 63. The index projection optical system 70 includes an index projection light source 7
1, a condenser lens 72, an index plate 73 having a predetermined shape index and a prism (both not shown) for refracting the index, a relay lens 74, a total reflection mirror 75, a half mirror 42, an aperture 41, and a hole 17a and the objective lens 18 are shared. The illumination light emitted from the index projection light source 71 projects the index formed on the index plate 73 onto the fundus Er through these optical components. The examiner uses the index projected on the fundus Er as an index image 73 ′ as shown in FIG.
Is observed on the screen 56, and the focusing operation is performed so that the index image 73 'is in a predetermined state for recognizing the focusing. Each of such optical systems 10, 20, 30, 7
0 is provided in the fundus camera 80 shown in FIG. In FIG. 3, a fundus camera 80 includes a gantry 82 mounted on a base 81 so as to be displaceable in the front and rear (Z direction) and left and right (X direction) with respect to the eye E to be inspected. The main body 83 includes a connected main body 83 that can be displaced up and down (Y direction), and a photographing / recording camera 84 that is detachably installed on the main body 83. The base 81 has a raised portion 81a formed at a rear portion near the left and right center, and a concave portion 8 formed at the raised portion 81a.
1b, a sliding member 85 slidably provided in the inner wall 1b, an operation dial 86 provided on the rear wall surface for slidingly displacing the sliding member 85, and a longitudinal movement device 87 for supporting the longitudinal displacement of the gantry 82. It has. As shown in FIG. 2A, the slide member 85 is formed on the shaft 85a, with the end of a shaft 85a protruding from the rear facing the cylindrical portion 86a fixed to the operation dial 86. Male thread (not shown) and tube 8
A female screw portion (not shown) formed on the inner wall surface of 6a is connected to the operation dial 86 in a screwed state. Therefore, by rotating the operation dial 86, the slide member 85 slides in the front-back direction. The slide operation of the slide member 85 is performed by a worm 86c fixed to a shaft 86b integral with a rack 85b formed on the bottom surface of the slide member 85 and the operation dial 86 as shown in FIG. 2B. 2C, or, as shown in FIG. 2C, a rack 85b formed on the bottom surface of the slide member 85 and the base 8.
No particular limitation is imposed on the operation dial 86 provided on the side wall surface of the first gear 86 and the external gear 86e fixed to the shaft 86d integrated with the operation dial 86. The front and rear moving devices 87, 87 are provided with a cover 87a.
And a rack 87 fixed to the base 81 and extending in the front-rear direction.
b and an external gear 87c that meshes with the rack 87b. The external gear 87c supports both ends of a shaft 88 passing through the gantry 82. Therefore, the gantry 82 is guided back and forth by the rack 87b and the external gear 87c, and is guided left and right by the shaft 88. The mount 82 has a shooting execution switch 8
The joystick 89 provided with 9a is displaced forward, backward, left and right. The gantry 82 is supported by the base 81 by a ball portion 89b formed at the lower end of the joystick 89 and moving support devices 87,87. further,
An operation ring 90 coaxial with the joystick 89 is provided on the gantry 82, and the main body 83 is displaced up and down by rotating the operation ring 90. That is, as shown in FIG.
A drive gear 90a is formed coaxially with the operation ring 90 below the support ring 90.
a driven gear 9 screwed into the screw portion 83c of the screw rod 83b projecting from
1 is engaged. Therefore, when the operation ring 90 is rotated,
The driven gear 91 rotates via the driving gear 90a in conjunction with this rotation, and the support 83a moves up and down in response to this rotation, and the main body 83 moves up and down. In addition, 82a is a cylindrical guide for guiding the screw rod 83b up and down, and 82b is a support 8
This is a guide cylinder that guides a guide bar 83d provided in 3a up and down. On the other hand, the insertion / removal of the correction lens 43 to the gantry 82, that is, the switching position for automatically switching the observation state by the observation / photographing optical system 30 between the fundus observation state and the anterior eye observation state is detected. A micro switch 92 is provided. The micro switch 92 has a sliding portion
Guide taper 93 and ridge 81 formed at the tip of material 85
a to be guided in contact with the guide taper 94 formed in
5 and a switch section 96 turned on / off by a pin 95
The micro switch 92 has a gantry 82 to be inspected.
Assist at a predetermined position when displaced in the front-back direction with respect to the eye E
Switches the lens system state between the fundus observation state and the anterior segment observation state.
It functions as switching means for switching. Operation dial 8
6 and the slide member 85 cooperate with each other by the switching means.
Switching position where bottom observation state and anterior eye observation state are switched
It functions as a change means for changing. Therefore, when the tip of the pin 95 is in contact with the flat portion 81c of the base 81, the switch 96 is turned off, and the correction lens 43 retreats from the optical path.
The monitor 55 displays a fundus image Er ′. The pin 95 is guided by the guide taper 93 and is in contact with the upper surface 93a of the slide member 85, and the pin 95 is guided by the guide taper 94 and the upper surface 9 of the raised portion 81a.
When it is in contact with 4a, the switch 96 is turned on, the correction lens 43 is inserted into the optical path, and the monitor 55 displays the anterior eye image Ep '. When the micro switch 92 is configured as a two-stage switch, for example, when the pin 95 is completely on the flat portion 81d of the raised portion 81a, the photographing operation is performed even if the photographing execution switch 89a is pressed. It is also possible to add a function other than the switching of the status display such as canceling of the display. When observing and photographing the fundus Er of the subject's eye E using the fundus camera 80 configured as described above, first, the position of the slide member 85 is adjusted by operating the operation dial 86. This position adjustment is determined, for example, by a position corresponding to the eye E to be examined (for example, by race) or by the examiner's preference. Then, the gantry 82 and the main body 83 are aligned in the left, right, up and down directions by operating the joystick 89. At this time, since the gantry 82 is located behind the base 81, the pins 95 are located on the upper surface 93a of the slide member 85 or the upper surface 94a of the raised portion 81a.
Therefore, the observation / photographing optical system 30 enters the anterior ocular segment observation state in which the correction lens 43 is inserted into the optical path, and the monitor 55 displays the anterior ocular segment image Ep ′. From this state, the joystick 89 is further moved.
To displace the gantry 82 and the main body 83 forward,
The pin 95 is guided by the guide tapers 94 and 93 and
When the abutment is made on the flat portion 81c, the switch 96 is turned off, the correction lens 43 is retracted from the optical path, the observation / photographing optical system 30 is in the fundus observation state, and the fundus image Er ′ is displayed on the monitor 55. The examiner can change the index image 7 from this state.
After performing a focusing operation so that 3 ′ is in a predetermined state as shown in FIG. 4B, a fundus image Er ′ is photographed by pressing a photographing execution switch 89a. On the other hand, when this photographing is completed and a new photographing or another photographing is started, the gantry 82 and the main body 83 are once displaced backward by operating the joystick 89, and then the alignment operation and the matching operation are performed again. Start the focus operation. At this time, when the gantry 82 is displaced rearward and the pin 95 at least rides on the guide taper 93, the switch 96 is turned on in conjunction with this, and the correction lens 43 is inserted into the optical path. The observation / photographing optical system 30 enters the anterior segment observation state, and the monitor 55 displays the anterior segment image Ep ′. Second Embodiment In the above embodiment, the observation state of the observation / photographing optical system 30 is changed by the correction lens 4.
Although the thing which made it switch by insertion / removal of 3 was disclosed,
For example, as shown in FIG. 6, it is also possible to switch the observation state of the observation / photographing optical system 30 by displacing the focusing lens 44 between a position indicated by a solid line and a position indicated by a chain line. . At this time, when the focusing lens 44 is at the solid line position, the fundus observation state is set, and when the focusing lens 44 is at the chain line position, the anterior eye observation state is set. In FIG. 6, the same components as those of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted. (Third Embodiment) FIGS. 7 and 8 show a third embodiment of the present invention. In the third embodiment, the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 7, reference numeral 100 denotes an illumination optical system for illuminating the fundus Er, and reference numeral 110 denotes an observation / photographing optical system for observing / photographing the anterior segment of the eye E to be examined and the fundus Er. The illumination optical system 100 includes an illumination light source 101, a photographing light source 102, condenser lenses 103 and 103, a half mirror 104, a ring opening plate 105 having a ring opening 105a, a relay lens 106, a mirror 107, a relay lens 108, and a hole. Mirror 17, objective lens 18
Etc. are provided. The observation optical system 110 includes an objective lens 18, an auxiliary lens system 111 composed of a plurality of lens groups, a perforated mirror 17, a diopter correcting lens 112, and a relay lens 11.
3. Quick return mirror 61, field lens 5
1, reflection mirror 53, relay lens 52, imaging tube 54,
It comprises a monitor 55 and the like. Auxiliary lens system 111 and diopter correcting lens 1
The insertion and removal of 12 from the observation optical path is controlled by a control device (not shown) by detecting the position of the pin 95 by the microswitch 92. For example, as shown in FIG. 8, when the pin 95 is in contact with the flat end portion 81c, that is, at the point P1
The auxiliary lens system 111 and the diopter correction lens 112 are in a detached state so as to be in the fundus oculi observation state when it is positioned closer to the subject (left side in FIG. 8). At this time, when the eye E to be examined is an amorphous eye, and when photographing the fundus Er of the eye E to be examined, the diopter correcting lens 112 is inserted into the observation optical path. When the pin 95 is in contact with the upper surface 93a, that is, when the pin 95 is located between the point P1 and the point P2, it is in the anterior eye observation state and the image of the anterior eye is displayed on the screen 56. The anterior ocular segment is in a state where Ep ′ is displayed, the auxiliary lens system 111 is in the inserted state, and the diopter correction lens 112 is in the detached state. Further, when the pin 95 is in contact with the flat end portion 81d, that is, when the pin 95 is closer to the examiner than the point P2 (FIG. 8).
(Right side in FIG. 5), the anterior segment is in the anterior segment observing state, and the anterior segment image Ep ′ is displayed more clearly on the screen 56, and the anterior segment is ready for photographing. The auxiliary lens system 111 is in the detached state, and the diopter correction lens 112 is in the inserted state. Accordingly, the position of the gantry 82 is detected by the pin 95 in conjunction with the forward / backward movement operation of the gantry 82 when the examiner observes or photographs the eye E to be inspected, and an optical system corresponding to the position of the pin 95 is used. The insertion / removal of the auxiliary lens system 111 and the diopter correction lens 112 into and out of the observation optical path is controlled so as to be as follows. As described above, in the fundus camera of the present invention, when the gantry is displaced in the front-rear direction with respect to the subject's eye, the state of the auxiliary lens system is determined at a predetermined position in the fundus observation state and the anterior ocular segment. observation state automatically switches provided with a switching means and the anterior segment and the fundus observation state by the switching means
Changing means for changing the switching position at which the state is switched to the observation state
Is provided, so that the state of the observation optical system can be automatically switched, so that a switch operation for switching the state of the observation optical system is not required, thereby facilitating the alignment operation and shortening the time. In addition to this, it is possible to allow the examiner / examinee to arbitrarily change the setting of the switching position.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an enlarged sectional view of a main part of a fundus camera according to the present invention. 2A is a cross-sectional view of a switching position changing unit, FIG. 2B is a cross-sectional view showing a second embodiment thereof, and FIG. 2C is a third embodiment thereof. FIG. 3A is a side view of a fundus camera, and FIG. 3B is a rear view of the same. FIG. 4A is a front view of a screen in an anterior segment observation state,
(B) is a front view of the screen in the fundus oculi observation state. FIG. 5 is an optical explanatory diagram of a fundus camera having the auxiliary lens system of the present invention. FIG. 6 is an optical explanatory diagram of the second embodiment. FIG. 7 is an optical explanatory diagram of the third embodiment. FIG. 8 is an explanatory view showing the operation of the third embodiment. [Explanation of Symbols] E: Eye to be inspected Ep: Anterior eye part Er: Eye fundus 84 ... Stand 30 ... Observation / photographing optical system 81 ... Body 43 ... Correction lens (auxiliary lens system) 80 ... Eye fundus camera 85 ... Slide member (switching means) ) 86 ... operating dial (switching means) 92 ... microswitch (switching means)

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Claims (1)

(57) [Claim 1] A gantry capable of being displaced in the front-rear and left-right directions with respect to the eye to be inspected, and an observation optical system for observing the eye to be inspected, and being integrated with the gantry in the front-rear and left-right directions. In a fundus camera including a displaceable main body and an auxiliary lens system capable of switching an observation state of the eye to be inspected by the observation optical system between a fundus oculi observation state and an anterior ocular segment observation state, the gantry is attached to the eye to be examined. Switching means for automatically switching the state of the auxiliary lens system between a fundus observation state and an anterior ocular segment observation state at a predetermined position when displaced in the front-rear direction is provided, and the switching means switches the state of the fundus observation state to the anterior eye observation state. Before said
Change to change the switching position to switch to the eye observation state
A fundus camera characterized by comprising means .