JPS63130040A - Ophthalmic machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Application Field This invention prevents an optometric unit (for example, a non-contact tonometer, a refractometer, an ocular fundus camera, etc.) from coming into contact with the eye to be examined. This invention relates to an ophthalmological instrument equipped with a safety device.

Conventional ophthalmic instruments, such as non-contact air-puff tonometers, which have a short working distance and which measure the cornea, a weak and easily damaged tissue, have traditionally been used to ensure safety. is the biggest requirement.

As one of the safety measures, this air-puff type tonometer employs a device that notifies the examiner if the forehead is not properly touching the forehead rest.

This is because when the examinee pulls his or her face back for some reason, the optometry unit approaches the examinee in an attempt to follow it.
This prevents the subject from coming into contact with the advancing optometry unit when the subject tries to apply the forehead correctly.

For this purpose, a safety device having a circuit configuration as shown in FIG. 5 is used. In this device, the forehead rest switch 1 is turned on and the lamp 2 is turned on only when the subject's forehead is correctly in contact with the forehead rest part. This allows the examiner to detect whether or not the forehead is placed correctly. Furthermore, instead of turning on the lamp 2, there is a system that notifies the examiner by changing the brightness of the alignment light.

Based on this detection, the examiner performs alignment only when the forehead is correctly in contact with the forehead rest, thereby preventing the optometry unit from coming into contact with the subject's eye.

Q. However, with conventional systems like this, the inspector performs alignment by checking that lamp 2 is lit, but it is possible that this lighting may be overlooked. , perfect safety measures are rough, and again.

During alignment, the examiner must always pay attention to the lighting state of the lamp 2, which poses a problem in that the alignment operation is difficult and time-consuming.

In order to solve these conventional problems, the present invention provides a pedestal equipped with an optometry unit that is movable back and forth on the pedestal base, and also allows the examinee's forehead to In the ophthalmological instrument, the forehead rest is provided with a forehead rest, and further equipped with a safety device for preventing the optometry unit from coming into contact with the subject's eye. The ophthalmological instrument is characterized in that it has a detection means for detecting a state in which the pedestal is not in use, and a prevention means for preventing the pedestal from moving forward based on a detection signal from the detection means.

According to this method, before performing an eye examination, an alignment operation is performed in advance, and the pedestal is advanced to bring the optometry unit close to the eye of the subject to be examined at an appropriate distance. During this alignment, if the subject's forehead does not properly contact the forehead rest of the ophthalmological instrument, this condition is detected by the detection means. Then, this detection signal activates the blocking means to automatically prevent the gantry from moving forward. Therefore, even if the examiner misperceives the state of the forehead rest relative to the forehead rest, the forward movement is prevented as described above, so that it is possible to prevent the eye to be examined from coming into contact with the optometry unit. At the same time, since the examiner does not have to constantly pay attention to the state of the forehead rest, he or she can concentrate on alignment, which can reduce the labor and time required for eye examination.

衷胤楌 Hereinafter, this invention will be explained based on examples.

1 to 3 are diagrams showing a first embodiment of the present invention.

First, to explain the configuration, the ophthalmological instrument of this example has a second
As shown in the figure, a pair of guide rails 12 (one of which is omitted) with a U-shaped cross section extending in the front-rear direction are arranged approximately parallel to each other on a pedestal base 11. A guide shaft 15 extending in the direction is slidably passed through, and transfer gears 16 are provided at both ends of the guide shaft 15.
is fixed, and this transfer gear 16 is configured to roll on a rack 12a disposed within the guide rail 12 as shown in FIG. Further, the pedestal 14 is provided with a joystick 17 for movement operation. Furthermore, a pair of columns 18.18 are erected on the front end side (subject side) of this gantry base 11, and the lower side of a pair of horizontal members 19.19 installed on these columns 18.18. A chin rest 20 is provided on the horizontal member 19, and a forehead rest 21 is provided on the upper horizontal member 19. The subject's face is fixed by these chinrest part 20 and forehead rest part 21.

Further, in order to prevent the eye examination unit 13 from coming into contact with the eye to be examined, a safety device @10 having the following configuration is provided.

That is, as shown in FIG. 1, the forehead resting section 21 includes a forehead detection switch 22 as a detection means that turns off when the forehead of the subject is not properly in contact with the forehead resting section 21.
is installed. Then, this switch 22 is turned OFF.
A blocking means is provided to prevent the pedestal 14 from advancing when this condition occurs. This blocking means is constructed as follows.

First, as shown in FIG. 3, a locking gear 23 is fixed inside the transfer gear 16 on the guide shaft 15. On the other hand, the rotary solenoid 24 is connected to the forehead detection switch 22.
is electrically connected, and an arm 25 is connected to this solenoid 24.
The proximal end of the arm 25 is fixed, and a tension spring 26 is disposed between the distal end of the arm 25 and the gantry base 11 to bias the arm 25 in the direction of arrow C in FIG. Further, a support column 27 is erected on the gantry base 11 near the locking gear 23.

A base end portion of a stopper member 28 having a rack-shaped tooth portion 28a is rotatably attached to the support column 27.

The teeth 28a of this stopper member 28 mesh with the locking gear 23, thereby preventing the pedestal 14 from moving forward or backward. Furthermore, the tip of this stopper member 28 and the tip of the arm 25 are connected by a lever 29.

Next, the operation of the ophthalmological instrument having such a configuration will be explained.

First, when the subject's chin is placed on the chinrest 20 of the ophthalmological instrument and the forehead is correctly placed on the forehead rest 21, the forehead detection switch 22 is turned on. Then, the rotary solenoid 24 is activated and the arm 25 is activated by the tension spring 2.
It is rotated in the direction of arrow C in FIG. 1 against the urging force of 6.

This rotation causes the stopper member 2 to move through the lever 29.
8 is rotated upward (in the direction of arrow C in FIG. 1). Then, the locking gear 23 and the stopper member 28 are disengaged, and the rolling gear 16 rolls on the rack 12a, allowing the frame work 4 to move back and forth, allowing the inspector to move the frame I4. After moving forward and performing alignment, perform a limit check.

On the other hand, if the subject moves his or her face during the alignment operation and the subject's forehead separates from the forehead rest 21, the forehead detection switch 22 is turned off. Then, the operation of the rotary solenoid 24 is stopped, and the stopper member 28 is rotated in the arrow direction in FIG. 1 by the urging force of the tension spring 26 via the arm 25 and lever 29. By meshing the tooth portion 28a with the locking gear 23, the pedestal 14 cannot be moved back and forth. in this way.

If the subject moves his or her face, the frame 1 will automatically move.
4 is blocked from moving forward and alignment cannot be performed.
The eye test can be performed safely without any contact with the subject's eye. Moreover, since the examiner does not have to constantly pay attention to the state of the forehead rest, the alignment operation can be easily performed and the eye examination time can be shortened.

Further, FIG. 4 shows a second embodiment of the present invention.

In this embodiment, a train 33 is provided in place of the locking gear 23 of the above embodiment, and the teeth 38a of the stopper member 38 are formed in the shape of a claw. and.

Only the forward movement of the pedestal 14 is prevented in a state where the train 33 and the teeth 38a of the stopper member 38 are engaged.

The claws are formed in a predetermined direction. Of course, retreat is possible.

According to this, when the subject's forehead does not hit the forehead rest part 21 correctly, the train 33
and the teeth 38a of the stopper member 38 mesh with each other. Then, the gantry 14 is prevented from moving forward, and the optometry unit 13 can be prevented from coming into contact with the eye to be examined, as in the above embodiment.

At the same time, since it is possible to retreat, it is convenient to retreat the optometry unit to avoid further danger.

The other configurations and operations are the same as those in the first embodiment, so their explanations will be omitted.

In each of the above embodiments, the blocking means is the locking gear 2.
3. Although the rotary solenoid 24 and the stopper member 28 are used, the structure is not limited to this.
If the structure is such that the forward movement of the stopper member 28 is prevented, for example, a member corresponding to the stopper member 28 described above may be disposed on the pedestal 14 side, and a member corresponding to the locking gear 23 or the like may be disposed on the pedestal base 11 side. It is also possible to set Further, in the above embodiment, a locking gear 23 etc. is provided separately from the transfer gear 16 to lock this gear 23 etc., but it is not necessary to provide this separate part such as the locking gear 23 etc. Of course, the transfer gear 16 may also be directly locked.

As explained above, according to the present invention, if the forehead of the examinee does not touch the forehead rest correctly, the advancement of the pedestal is automatically prevented, so that the optometry unit is prevented from moving forward. In addition to preventing contact with the subject's eye, the examiner does not have to pay attention to the state of the forehead rest, which has the practical effect of reducing labor and eye examination time. .

[Brief explanation of the drawing]

1 to 3 are diagrams showing a first embodiment of the optometry device of the present invention, in which FIG. 1 is a schematic diagram showing a safety device, FIG. 2 is a perspective view of the optometry device, and FIG. 3 is a guide rail. FIG. 4 is a partially sectional plan view showing the transfer gear, etc., and FIG.
FIG. 5 is a side view showing a stopper member and a train, and FIG. 5 is an electric circuit diagram showing a conventional safety device. lO... Safety device 11... Frame base, 1
3...Optometry unit 14...Base 21...Forehead rest part 22...Forehead detection switch (detection means) Fig. 1 10-Safety device 11-Each person 22--1! I Inspection switch (detection means) 2nd monitor 1 13 = -# Eye unit 14 - Frame 21 - Forehead holder Figure 3 Figure 4

Claims (1)

[Scope of Claims] A pedestal equipped with an optometry unit is disposed on a pedestal base so as to be movable back and forth, and a forehead rest against which the forehead of the subject comes into contact is provided, In an ophthalmological instrument equipped with a safety device that prevents contact with the subject's eye, the safety device includes a detection means for detecting a state in which the forehead of the subject is not properly in contact with the forehead rest, and a An ophthalmological instrument comprising: a blocking means for blocking the advancement of the pedestal in response to a detection signal.