JP2003010119A - Ophthalmologic examination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ophthalmologic examination device capable of positioning a body part by proper operability even in either of a front eye part observing state and an eyeground observing state with light operation force. SOLUTION: A front eye part observing mode for observing a front eye part of a subject eye or an eyeground observing mode for observing the eyeground of the subject eye is selected according to insertion-extraction of a front eye part lens L1 by a front eye part switch 109 or according to positions of the body part 101 and the subject eye. The front eye part switch 109 is interlocked with a switch 114, and source voltage of a DC motor 107 for controlling a vertical movement of the body part 101 is switched, and a moving speed of the body part 101 is controlled so as to become fast in the front eye part observing mode, and become slow in the eyeground observing mode of requiring to finely adjust a position since an observation visual field is small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration of an optical system or an optical system for an anterior ocular segment observation state for observing an anterior ocular segment of an eye to be inspected or a fundus observation state for observing a fundus of an eye to be inspected. The present invention relates to an ophthalmic examination apparatus capable of adjusting the position of a main body portion including the ophthalmic examination apparatus.

[0002]

2. Description of the Related Art Conventionally, an ophthalmologic examination apparatus such as a fundus camera has been used for performing examinations such as photographing, observation, and measurement of the fundus.

With such a device, examinations such as photographing, observation, and measurement of the fundus of the eye (in the following, unless otherwise particularly distinguished, these various "examinations" are simply treated as the term "observation") In order to perform the same as in the description of the claims), it is necessary to perform alignment work for adjusting the relative position of the device and the eye to be inspected.

In this alignment, for example, the anterior ocular segment of the eye to be inspected is first aligned with the apparatus, and then the fundus of the eye to be inspected and the apparatus are aligned more precisely. Of these states, the state in which the anterior segment of the eye to be inspected and the device are aligned is the anterior segment observation state, and the state in which the fundus and the device are subsequently aligned is the fundus observation state.

As described above, the ophthalmologic examination apparatus is required to be able to adjust the configuration of the optical system or the position of the main body including the optical system in the anterior segment observation state and the fundus observation state.

[0006]

To adjust the apparatus to the anterior segment observation state or the fundus observation state, a method of adjusting the distance between the apparatus and the eye to be inspected and inserting / removing the anterior segment lens into / from the optical system. The configuration is known.

It is necessary to perform, for example, the above-described alignment operation in either the anterior segment observation state or the fundus observation state, and the main body of the apparatus can be vertically and horizontally moved and adjusted in any of the upper and lower directions. .

There are a manual type and an electric type for moving the main body, but the manual type has a drawback that the vertical operation feeling tends to be particularly bad (heavy), while the electric type has a fine position adjustment. There is a difficult problem.

An object of the present invention is to solve the above problems, and an ophthalmologic examination capable of aligning the main body portion with a light operating force and with appropriate operability in any of the anterior segment observation state and the fundus observation state. To provide a device.

[0010]

In order to solve the above problems, according to the present invention, an anterior segment observation state for observing the anterior segment of the eye or a fundus observation state for observing the fundus of the subject's eye is performed. In an ophthalmologic examination apparatus capable of adjusting the position of a main body portion including the configuration of an optical system or the optical system in any one, drive means for moving the main body portion, the moving speed of the main body portion and the anterior segment observation state A configuration is adopted that has a control unit that changes the driving speed of the driving unit so that the moving speed becomes different in the fundus observation state.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of an optical system of an ophthalmic examination apparatus and a periphery of a gantry which employ the present invention. In the present embodiment, an electric type having a light operating force is basically used for the movement of the apparatus main body, and a configuration for improving the operability by controlling the moving speed is exemplified.

First, the optical system of the apparatus will be described. In this device, as shown in FIG. 1, an observation light source 2 such as a halogen lamp is arranged at the center of a mirror 1, and the light emitted from this light source 2 is condensed by a condenser lens 3, a filter 4,
The light enters the lens 6 through the mirror 5 and the ring slit 7 for forming ring-shaped illumination. The filter 4 is an infrared filter that transmits only infrared light, and the mirror 5 is a half mirror, a dichroic mirror (visible light transmission, infrared light reflection), or a return mirror (removable mirror).
It consists of either.

The light beam which has passed through the ring slit 7 subsequently passes through a relay lens 8 and a black spot plate 9 for reflecting the objective lens, a return mirror M1 and a lens 10 and a position conjugate with the anterior segment of the eye to be examined. After being reflected by the perforated total reflection mirror 11 arranged at, the light enters the fundus Er from the pupil (iris) Ep of the eye E through the objective lens 12.

Reflected light from the fundus Er is again received from the pupil Ep through the objective lens 12, and the perforated total reflection mirror 1 is received.
The light passes through the focusing lens 16 and the imaging lens 17 through the hole No. 1 and enters the return mirror 18. Return mirror 1
The light reflected by 8 passes through a field stop (mask) 19 placed at a focus position, and then passes through a field lens 20, a mirror 21, and a lens 22, and an image sensor 23 such as a CCD.
And is observed by the examiner on the monitor M.

When the fundus image is to be photographed on a film, the strobe 14 placed at the center of the mirror 13 emits light, and the fundus Er is illuminated through the condenser lens 15 and the mirror 5 in the same manner as described above. In synchronization with this, the return mirror 18 is removed from the optical path, and a fundus image is photographed on the film F.

An auxiliary lens (hereinafter referred to as an anterior segment lens) L1 for observing the anterior segment of the eye is arranged between the perforated total reflection mirror 11 and the objective lens 12 so that it can be inserted into or removed from the optical path. And a light source 30 for projecting an index for alignment through the return mirror M1.
And an index 31 for alignment including a pinhole, etc.
Is provided. The position of the index 31 is set so as to form an image on the anterior segment of the eye to be examined, that is, the pupil (iris) Ep of the subject's eye through the anterior segment lens L1 when the alignment between the subject's eye and the device is correct. It That is, when the anterior segment lens L1 is inserted, the anterior segment of the eye to be examined becomes conjugated to the observation surface instead of the fundus, and the image formation state of the alignment index formed on the pupil (iris) Ep of the eye to be examined can be observed. Like

The above optical system is housed in the main body 101, and the objective lens 12 is arranged on the front side of the eye E and the monitor M is arranged on the back side of the examiner.

The main body 101 is mounted on the gantry 102. A screw shaft 10 is provided at the base of the main body 101.
4 are planted, and the balance spring 10 is provided around the screw shaft 104 between the main body 101 and the mount 102.
Five are stretched.

The screw shaft 104 is a gear train 106.
Screwed to the gear train 106 by the DC motor 107.
The position of the main body 101 can be adjusted in the vertical direction by changing the screwing amount of the screw shaft 104 with respect to the gantry 102 via.

Further, the pedestal part 102 has a base 1 below it.
It is supported by 03, can be operated by a drive mechanism (an electric mechanism by a motor or a solenoid, or a manual mechanism) (not shown), and can be moved in a horizontal plane.

The vertical position of the main body 101 is a switch (U
P) 110 and switch (DOWN) 111 control the DC motor 107 for adjustment. Reference numeral 108
As shown by the contact points of the switches 110 and 111,
The switches 110 and 111 are wired so as to invert the drive polarity of the DC motor 107. When the switch 110 is turned on, the main body 101 rises, and when the switch 111 is turned on, the main body 101 is moved. The DC motor 107 is driven in the descending direction.

The horizontal position of the gantry 102 is the pedestal 102.
It can be controlled by a joystick 112 provided on the. The joystick 112 is a drive mechanism (not shown) that determines the position of the gantry 102 in the horizontal plane.
By operating the joystick 112, the position of the gantry 102 in the horizontal plane can be controlled as desired. Further, the shutter switch 1 for determining the photographing timing is provided on the head of the joystick 112.
13 are provided.

Further, on the gantry 102, as a mode switch for controlling the anterior segment observation mode (anterior segment observation state) or the fundus observation mode (fundus observation state),
The anterior segment switch 109 is provided (however, the position of the anterior segment switch 109 is arbitrary). The anterior segment switch 109 is for controlling whether or not the anterior segment lens L1 is inserted in the optical path. The anterior segment switch 109 is connected to a motor, solenoid, or the like (not shown), and the examiner can operate the anterior segment switch 109 to control the insertion / removal of the anterior segment lens L1.

In the present embodiment, the anterior segment switch 109 is linked with the switch 114 for controlling the drive voltage of the DC motor 107 to either 12V or 5V. This interlocking state is as follows.

That is, when the anterior segment switch 109 is set to the anterior segment observation mode, the anterior segment lens L1 is inserted into the optical path and the switch 114 is switched so that the drive voltage of the DC motor 107 becomes 12V. When the anterior segment switch 109 is set to the fundus observation mode, the anterior segment lens L1 is removed from the optical path, and the switch 1
14 is switched so that the drive voltage of the DC motor 107 becomes 5V. Power supply voltages of 12 V and 5 V are supplied from a power supply unit (not shown).

Thus, by controlling the drive voltage of the DC motor 107 to be large in the anterior segment observation mode and small in the fundus observation mode, the rotation speed of the DC motor 107 is large (fast) in the anterior segment observation mode. In the fundus observation mode, it is controlled smaller (slower) than that.

As a result, the ascending / descending speed of the main body 101 becomes faster in the anterior segment observation mode, and slower than that in the fundus observation mode.

That is, the moving speed of the main body 101 is fast in the anterior ocular segment observation mode where the observation field of view is large and rough position adjustment is required, and the fundus observation mode where the observation field of view is small and fine position adjustment is required. You can control late.

Therefore, for example, the switch 110,
If 111 is a momentary-type button switch or the like, the movement amount when the switches 110 and 111 are operated at the same time is large in the anterior segment observation mode and small in the fundus observation mode. Very easy to operate.

In the above description, the configuration is such that the moving speed of the main body 101 is set to different values in the anterior segment observation mode and the fundus observation mode, but in addition to this, a mechanism for controlling the moving speed of the main body 101 is provided. be able to.

For example, as shown in FIG. 2, the voltage control circuits 201 to 203 are inserted into the control circuit of the DC motor 107. It is assumed that the voltage control circuits 201 to 203 can control the voltage of the power supply line at each insertion position by using, for example, a variable resistor (volume), a resistor array, a rotary switch, or the like.

As an embodiment, the voltage control circuits 201 to 201
It is conceivable that 203 is provided with any one, two, or all of them.

For example, since the voltage control circuit 201 performs voltage control immediately before the DC motor 107, it operates like a master volume (switch), and voltage control is performed in both the anterior segment observation mode and the fundus observation mode. The moving speed of the main body 101 can be adjusted with only one circuit 201.

Voltage control circuit 202, voltage control circuit 203
If they are individually provided, the voltage control circuit 202 and the voltage control circuit 203 respectively act as means for adjusting the moving speed of the main body 101 in the anterior segment observation mode and the fundus observation mode. If such an adjusting means is required only in either the anterior segment observation mode or the fundus observation mode, only one of the voltage control circuit 202 and the voltage control circuit 203 may be provided.

If the voltage control circuits 201 to 203 are provided, the examiner can preset and adjust the moving speed of the main body 101 to a desired value by these voltage control circuits in advance, and then the anterior segment of the eye. Switch 109, switch 1
It is possible to concentrate on the operation of 10, 111.

In the above, the switch 11 is used as an up / down switch for operating the vertical movement of the main body 101.
Although the configuration in which 0 and 111 are provided has been illustrated, this main body 10
The structure of the means for operating the vertical movement of 1 is arbitrary, for example, the grip 112a of the joystick 112 (FIG. 1).
Is a rotating type, and the switch 1 is provided inside the grip 112a.
10 and 111 are moved so that the switch 110 (UP) is turned on when the grip 112a is turned clockwise, and the switch 111 (DOWN) is turned on when the grip 112a is turned counterclockwise (turned). The relationship between the dynamic operation direction and the switches 110 and 111 that are turned on may be reversed.). With such a configuration, the joystick 112 alone can control the vertical movement of the main body and the horizontal movement, which is very convenient.

Although an example of controlling the drive speed of the mechanism for moving the main body 101 in the vertical direction has been shown above,
A similar control system can be used for the horizontal movement of the main body 101. For example, if the DC motor 107 is a motor that drives the main body 101 in the horizontal x-axis or y-axis direction and is controlled by the joystick 112, the anterior ocular segment switch 109 can be operated in the same manner as described above. .

In the above description, the motor for driving the main body 101 is a DC motor. However, the driving method of the motor is arbitrary, and any motor such as a pulse motor can be used. By using a drive speed control circuit suitable for the motor drive method, the movement speed of the main body 101 is fast in the anterior segment observation mode, the observation field of view is small, and fine position adjustment is required. In the observation mode, it can be controlled slowly.

In the above description, the moving speed of the main body 101 is controlled by controlling the rotation speed of the motor. However, of course, the moving speed of the main body 101 is controlled by controlling the gear ratio of the gearbox or the V belt. It goes without saying that the object of the present invention can be achieved even with a configuration for controlling the.

Further, in the above, the contact point of the switch 114 is controlled in association with the insertion / removal of the anterior segment lens L1, that is, in association with the insertion / removal of the anterior segment lens L1, the anterior segment observation mode and the fundus. Although the configuration has been shown in which the observation modes are detected and the moving speed of the main body 101 in these modes is controlled, the anterior segment observation mode and the fundus observation mode can be detected by other methods.

For example, the main body 101 (and the gantry 1)
02) A limit switch for detecting the position on the base 103 is provided, and it is possible to detect whether the apparatus is in the anterior segment observation mode or the fundus observation mode from the detection state of the limit switch. For example, if the body 101 is closer to the eye E to be examined, the anterior ocular segment observation mode is determined, and if the body 101 is farther than the eye E to be examined, the fundus observation mode is determined, and the switch 114 may be controlled in the same manner as described above. Such a configuration is also useful in a fundus camera that does not use the anterior segment lens L1.

[0043]

As is apparent from the above description, according to the present invention, the anterior segment observation state for observing the anterior segment of the subject's eye,
Alternatively, in an ophthalmologic examination apparatus capable of adjusting the configuration of the optical system or the position of the main body including the optical system in any of the fundus observation states for observing the fundus of the eye to be inspected, drive means for moving the main body, and the main body Since the moving speed of the part has a control means for changing the driving speed of the driving means so that the moving speed of the anterior segment is different from that in the anterior ocular segment observing state and the fundus observing state, a light operating force is used. In addition, the excellent effect that the position of the main body can be adjusted with appropriate operability in either the anterior segment observation state or the fundus observation state is obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of an ophthalmologic examination apparatus adopting the present invention.

FIG. 2 is a circuit diagram showing a modified example of the control circuit of the device of FIG.

[Explanation of symbols]

2 light sources 3 condenser lens 4 filters 5 mirror 6 lenses 7 ring slit 8 relay lens 9 black dots 10 lenses 11 Perforated total reflection mirror 12 Objective lens 13 mirror 14 Strobe 15 Condenser lens 16 Focusing lens 17 Imaging lens 18 Return mirror 20 field lens 21 mirror 22 lens 23 Image sensor 30 light sources 31 indicators 101 main body 102 mount 103 base 104 screw shaft 105 balance spring 106 Gear Train 107 DC motor 109 Anterior segment switch 110 switch (UP) 111 switch (DOWN) 112 joystick 113 shutter switch 114 switch 201-203 voltage control circuit L1 anterior segment lens M monitor M1 return mirror E eye to be examined Er fundus F film

Claims (9)

[Claims] 1. The configuration of the optical system or the position of the main body including the optical system is set to either the anterior segment observation state for observing the anterior segment of the subject's eye or the fundus observation state for observing the fundus of the subject's eye. In an adjustable ophthalmic examination apparatus, drive means for moving the main body, and drive of the drive means so that the moving speed of the main body is different in the anterior ocular segment observation state and the fundus observation state. An ophthalmologic examination apparatus comprising control means for changing speed. 2. The control means controls the drive speed of the drive means so that the moving speed of the main body is higher in the anterior ocular segment observing state than in the fundus observing state. The ophthalmic examination apparatus according to 1. 3. The control means controls the driving speed of the driving means in accordance with the position of the anterior segment lens inserted into the optical system in the anterior segment observation state. Alternatively, the ophthalmic examination apparatus according to claim 2. 4. The ophthalmic examination according to claim 1, wherein the control unit controls a driving speed of the driving unit according to a distance between an eye to be inspected and an objective lens of the optical system. apparatus. 5. The ophthalmic examination apparatus according to claim 1, wherein the driving unit controls vertical movement of the main body. 6. The ophthalmic examination apparatus according to claim 1, wherein the driving unit controls movement of the main body in a horizontal plane. 7. The ophthalmic examination apparatus according to claim 1, further comprising adjusting means capable of presetting a driving speed of the driving means in the anterior segment observation state or the fundus observation state. 8. An operation for controlling the vertical movement of the main body and the horizontal movement of the main body through the driving means, the operation for controlling the vertical movement of the main body and the horizontal movement of the main body. 7. An ophthalmologic examination apparatus according to claim 5, wherein a joystick is provided as the means. 9. The ophthalmologic examination apparatus according to claim 5, wherein the vertical movement of the main body is controlled by rotating the joystick.