JPS62112526A - 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) The present invention detects whether or not the subject's forehead is properly abutted against a forehead rest based on the detection result of a detection switch. The subject's eye is displayed based on the detection result of the alignment detection means that indicates whether the subject's eye has been properly aligned with the measuring device. This invention relates to an improvement in an ophthalmological instrument that indicates that the optometrist has been properly aligned.

(Prior Art) Traditionally, in ophthalmological instruments, in order to eliminate measurement errors and perform accurate measurements, the subject's chin is placed on a chin rest.
Ophthalmological measurements are performed by positioning the examinee's face by placing the examinee's forehead in contact with the forehead rest, and adjusting the alignment of the examinee's eye with respect to the measuring device. Based on the detection result of a detection switch that detects whether or not the forehead is properly abutted on the forehead rest, the examiner is made to perceive that the forehead is properly abutted on the forehead rest by displaying the information, and Displaying and perceiving to the examiner that the eye to be examined is properly aligned based on the detection result of the alignment detection means that detects whether or not the eye to be examined is properly aligned with the measuring device. I try to let them do it.

(Problems to be Solved by the Invention) However, in this conventional ophthalmological instrument, there is a display means for displaying that the forehead of the subject is properly in contact with the forehead rest, and a display means for displaying that the forehead of the subject is in proper contact with the forehead rest, and a Since the display means for displaying whether or not the optometrist has been properly aligned is provided separately, the examiner must check the display status of both display means when performing ophthalmological measurements. When it is difficult to judge whether or not the subject's eye is properly aligned with the measuring device, it is possible to be so focused on the judgment that one forgets to check that the forehead is properly in contact with the forehead rest. The problem is that it is troublesome to confirm when carrying out the process.

(Object of the Invention) The present invention was made in consideration of the above circumstances, and its purpose is to confirm whether the forehead of the subject is in proper contact with the forehead rest and to ensure that the eye of the subject is in contact with the measuring device. An object of the present invention is to provide an ophthalmological instrument that can easily confirm whether or not it has been properly aligned.

(Means for Solving the Problems) The ophthalmological instrument according to the present invention is characterized by a display indicating that the forehead is properly abutted on the forehead rest based on the detection result of the detection switch. A display state changing means is provided for changing the state to a display state including that the eye to be examined is properly aligned based on the detection result of the alignment detecting means.

(Function) According to the ophthalmological instrument according to the present invention, when the forehead of the examinee is properly in contact with the forehead rest, the forehead of the examinee is properly placed on the forehead rest based on the detection result of the detection switch. It is displayed that it is in contact with the When the forehead of the examinee is properly brought into contact with the forehead rest and the eye to be examined is properly aligned with the measuring device, the display state changing means causes the forehead of the examinee to be brought into proper contact with the forehead rest. The display state that only indicates that the subject's eye is in contact is changed to the display state that also indicates that the subject's eye is properly aligned. Therefore, by checking the display status, the examiner can easily confirm that the examinee's forehead is properly in contact with the forehead rest and that the examinee's eyes are properly aligned with the measuring device. can.

(Example) Examples of the ophthalmological instrument according to the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a first embodiment of the ophthalmological instrument according to the present invention. In FIG. The face is placed on the chin rest 3 and the forehead 4 is brought into contact with the forehead rest 5 to position the face relative to the measuring device. This forehead rest 5 is provided with a detection switch 6. A pair of detection switches 6 are provided at both end portions in the extending direction of the forehead rest 5, and have a function of detecting whether or not the forehead 4 of the subject 1 is properly abutted against the forehead rest 5. The detection output of the detection switch 6 is input to display state changing means, which will be described later.

The eye 7 of the subject 1 undergoes alignment adjustment with respect to the measuring device by an alignment optical system 8. In this alignment optical system 8.

For example, an optical system disclosed in Japanese Patent Application No. 60-59994 is used, but its detailed configuration is not directly related to the present invention, so a description thereof will be omitted. The detection light of the alignment optical system 8 is guided to a light receiving element 12 via half mirrors 9 and 10 and an imaging lens 11. This light receiving element 12 functions as an alignment detection means for detecting whether or not the eye 7 of the subject 1 is properly aligned with the measuring device. The detection output of the light receiving element 12 is sent to the CPU which constitutes a part of the display state changing means 13.
14.

The display state changing means 13 displays that the forehead 4 of the subject 1 is properly in contact with the forehead rest 5 based on the detection result of the detection switch 6, and changes the display state to the light receiving element 1.
It has a function of changing the display state to include the fact that the eye 7 to be examined is properly aligned based on the detection result of step 2. This display state changing means 13 includes AND circuits 15, 16, and an oscillator 17 in addition to the CPU 14. Here, a negative logic type is used for the AND circuits 15 and 16. The output of this CPU 14 is H as shown in FIG. 2 when the eye 7 to be examined is not properly aligned with the measuring device, and when the eye 7 to be examined is properly aligned with the measuring device. It is said to be L. The oscillator 17 is turned on when the power is turned on, and has a function of outputting a rectangular pulse shown in FIG. 2.

The output of the CPU 14 is input to one terminal 15a of the AND circuit 15, and the output of the oscillator 17 is input to the other terminal 15b. The output of the AND circuit 15 is H when the output of the CPU 14 is L and the output of the oscillator 17 is L, and is L when at least one of the output of the CPU 14 and the output of the oscillator 17 is H. The output of this AND circuit 15 is input to one terminal 16a of the AND circuit 16.

The output of the detection switch 6 is input to the other terminal 16b of the AND circuit 16, and the detection switch 6 is
In terms of circuitry, it is included in the display state changing means 13 and displayed. One end of this detection switch 6 is grounded, and the other end is connected to the other terminal 16b of the AND circuit 16.

The output of this detection switch 6 is H when the forehead 4 is not properly abutted against the forehead rest 5, and becomes L when the forehead 4 is properly abutted against the forehead rest 5. A
The output of the ND circuit 16 becomes H as shown in FIG. 2 when the output of the AND circuit 15 is L and the output of the detection switch 6 is L, and the output of the AND circuit 15 and the output of the detection switch 6 are When at least one of the and is H, the L will sound.

The output of this AND circuit 16 is input to a switching circuit 18 forming part of the display means. Switching circuit 1
8 is a high active type switch, which is conceptually expressed as a contact type switch, 19 is a movable contact, and 20 and 21 are fixed contacts. Movable contact 19
is connected to the fixed contact 20 when the output of the AND circuit 16 is L, and is connected to the fixed contact 20 when the output of the AND circuit 16 is H.
1. The fixed contacts 20, 21 are connected to a lamp 22, which is dimly emitted when the movable contact 19 is connected to the fixed contact 20 and brightly emitted when the movable contact 19 is connected to the fixed contact 21. It is.

The illumination light from this lamp 22 is guided to a reticle plate 24 via a condensing lens 23, and illuminates the reticle plate 24. A circular mark is drawn on this reticle plate 24. The illumination light of the lamp 22 is as follows.

Passing through the reticle plate 24, the half mirrors 9, 10,
The image is guided to a CR7 screen 26 via an imaging lens 25, and a mark 27 corresponding to the circular mark is displayed on the CR7 screen 26 by the imaging lens 25.

This mark 27 indicates whether or not the forehead 4 is properly abutted against the forehead rest 5.
When the mark 27 is connected to the fixed contact 20, it is displayed darkly, and when the movable contact 19 is connected to the fixed contact 21, it is displayed brightly, and when the mark 27 is displayed darkly, the forehead 4 is properly attached to the forehead rest 5. A display state in which the mark 27 is brightly displayed corresponds to a display state in which the forehead 4 is in proper contact with the forehead rest 5.

Next, the operation of the ophthalmological instrument according to the present invention will be explained with reference to FIG.

The output of the CPUI 4 is H when the eye 7 to be examined is not properly aligned with the measurement device, so the output is A.
The output of the ND circuit 15 is L regardless of whether the output of the oscillator 17 is H or L. Therefore, the output of the AND circuit 16 becomes L when the output of the detection switch 6 is H, and becomes H when the output of the detection switch 6 is L. Therefore,
When the nod 4 is not in proper contact with the forehead rest 5, the output of the detection switch 6 is H, so the output of the AND circuit 16 is L, the movable contact 19 is connected to the fixed contact 20, and the lamp 22 is turned on. The light is emitted darkly, and the mark 27 is displayed darkly.

When the forehead 4 comes into proper contact with the forehead rest 5, the output of the detection switch 6 becomes L, so the output of the AND circuit 16 becomes H, the movable contact 19 is connected to the fixed contact 21, and the lamp 2
2 is emitted brightly, and the mark 27 is displayed brightly.

Therefore, the examiner can confirm whether the forehead 4 is properly abutted against the forehead rest 5 by visually observing whether the mark 27 is displayed brightly.

In this bright display state.

When the eye 7 to be examined is properly aligned with the measuring device, based on the detection output of the light receiving element 12.

The output of the CPU 14 changes from H to L. Then, the output of the AND circuit 15 alternately repeats H and L.

In accordance with the output of the AND circuit 15, the output of the AND circuit 16 alternately repeats H and L, so that the movable contacts 19 of the switching circuit 18 are alternately connected to the fixed contacts 20, 21, and the lamps 22 are alternately connected. The light and dark state will be repeated. Therefore, the mark 27 is in a blinking state, and is in a display state that indicates that the eye 7 to be examined has been properly aligned based on the detection result of the light receiving element 12 as an alignment detection means. By visually observing the flashing state of the mark 27, the examiner can confirm that the alignment with respect to the eye 7 to be examined is appropriate and that the forehead 4 is properly abutted against the forehead rest 5.

FIG. 3 shows a second embodiment of the ophthalmological instrument according to the present invention, which is configured to allow the subject 1 to confirm whether or not the forehead 4 is properly abutted against the forehead rest 5. A switching circuit 28 is provided in parallel with the switching circuit 18, and the light emission of the lamp 30 for illuminating the fixation target 29 is controlled between the fixed contacts 31 and 32 and the movable contact 33 based on the output of the display state changing means 13. The configuration is such that the state can be changed between a bright state and a dark state by switching the connection state. With this configuration, when the forehead 4 is not properly abutted against the forehead rest 5, the subject 1 himself/herself confirms this and adjusts the amount so that the forehead 4 is properly brought into contact with the forehead rest 5. 4 can be adjusted, so the examiner can adjust the forehead 4 to the forehead rest 5 to the subject 1.
This eliminates the inconvenience of constantly informing that the object is not properly abutted. 3, reference numeral 34 is a half mirror that constitutes a part of the fixation target optical system, and the illumination light that has passed through the fixation target 29 is guided to the eye 7 to be examined via this half mirror 34. It is something that can be done.

(Effects of the Invention) As explained above, the ophthalmic instrument according to the present invention adjusts the display state indicating that the forehead is properly abutted against the forehead rest based on the detection result of the detection switch. Since the display state changing means is provided to change the display state to a display state that indicates that the examinee's eye is properly aligned based on the detection result of the detection means, the examinee's forehead is properly aligned with the forehead rest. 6. It is possible to easily check whether the eye is in contact with the measuring device and whether the eye to be examined is properly aligned with the measuring device.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the main part configuration of the ophthalmological instrument according to the present invention, FIG. 2 is a timing chart for explaining the operation of the ophthalmic instrument shown in FIG. 1, and FIG. 3 is a diagram showing the ophthalmic instrument according to the present invention. This is a diagram for explaining the second embodiment. 1... Subject, 4... Forehead. 5...Forehead rest, 6...Detection switch, 7.
... Eye to be examined, 8... Alignment optical system, 1
2... Light receiving element, 13... Display state changing means, 14... CPU, 15.16... A
ND circuit, 17... Oscillator, 18... Switching circuit, 19... Movable contact, 20.21...
・Fixed contact, 22... Lamp, 24... Reticle plate, 26... CRT, 27...
mark.

Claims (1)

[Claims] (1) Based on the detection result of a detection switch that detects whether or not the subject's forehead is properly abutted against the forehead rest, it is displayed that the forehead of the subject is properly abutted against the forehead rest, and , an ophthalmological instrument that displays that the eye to be examined is properly aligned based on a detection result of an alignment detection means that detects whether or not the eye to be examined is properly aligned with respect to the measuring device, A display state indicating that the forehead is properly abutted on the forehead rest based on the detection result of the detection switch is adjusted so that the eye to be examined is properly aligned based on the detection result of the alignment detection means. 1. An ophthalmological instrument characterized by being provided with display state changing means for changing the display state to a display state that includes the information that has been displayed.