JPH08117188A - Aligning device for ophthalmologic apparatus - Google Patents

Abstract

PURPOSE: To make it possible to automatically suspend alignment when a fixation defect and the like occur. CONSTITUTION: The cornea Ec of the eye E to be examined is irradiated with the luminous flux from a light source 11 and the reflected light is detected by two two-dimensional position detecting means 13a, 13b when an inspector pushes an eye examination start button. The signals thereof are stored in an image memory via an A/D converter and the position of the eye E to be examined with respect to an eye examination part is calculated by a CPU, etc. At this time, the position detection is attempted to be repeated again in case the position information of the eye E to be examined is not obtainable. An alignment error is generated to the testee in case of a failure in detection even if the detections are executed the prescribed number of times.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning device for an ophthalmologic apparatus which drives a driving device on the basis of position information of a position detecting device to automatically align the eye to be inspected with the device. .

[0002]

2. Description of the Related Art Conventionally, there has been a position detecting means for detecting the position of an eye to be inspected in the apparatus, and a driving means for moving a part of the apparatus up, down, left and right, or in the front-back direction. However, there is known a device for automatically aligning the drive means by driving the drive means based on the position information from the position detecting means.

In such a device, when the examiner presses the measurement switch, the relative position between the eye to be inspected and the device is detected,
If a part of the device moves to match the position of the eye to be inspected, and if further position displacement is detected by performing position detection again, by repeating the operation of moving to a new position again, the eye to be inspected and the device A method is adopted in which the ophthalmic measurement is started when the positional deviation of (3) reaches within a predetermined allowable amount.

[0004]

However, in the above-described conventional example, when the examinee is likely to have a poor fixation such as a child, an elderly person, or nystagmus, the position of the examinee's eye is detected once and the device is detected. After the adjustment, the eye position shifts again, the position is detected again, and the device is moved again.Therefore, the movement and detection are repeated, and the measurement does not end at any time. There is a problem.

A first object of the present invention is to solve the above-mentioned problems and to provide an alignment apparatus for an ophthalmologic apparatus which automatically stops the alignment when measuring an eye with poor fixation. is there.

A second object of the present invention is to provide an alignment device for an ophthalmologic apparatus which automatically relaxes the allowable alignment amount and continues the measurement when measuring a poor fixation eye. is there.

[0007]

A positioning device for an ophthalmologic apparatus according to a first aspect of the present invention for achieving the above object, is a position detecting device for detecting a relative position between an eye to be inspected and an optometry part, In order to have the driving means for driving the optometry section in at least one-dimensional direction for driving the driving means based on the output of the position detecting means to perform the positioning, The driving of the driving means is stopped when it is detected that the driving means has been driven a predetermined number of times or more or the position detecting means has operated for a predetermined time or more.

Further, according to a second aspect of the present invention, there is provided a position aligning device for an ophthalmologic apparatus, a position detecting means for detecting a relative position between an eye to be inspected and an eye examining part, and an eye examining part for aligning at least one-dimensional direction. By having the driving means for driving, driving the driving means based on the output of the position detecting means, and performing the position detection again, and the distance between the eye to be inspected and the optometry portion is within a predetermined allowable amount. In the alignment device for an ophthalmologic apparatus that completes the alignment, when it is detected that the drive means has been driven a predetermined number of times or more or the position detection means has operated for a predetermined time or longer, the allowable amount is increased and The feature is that alignment is performed.

[0009]

The position aligning device for an ophthalmologic apparatus according to the first aspect of the present invention, which has the above-described structure, detects the positions of the eye to be inspected and the eye examining part by the position detecting means, and drives the driving means based on the detection signal to perform the position adjustment. When the driving is performed, the driving means is stopped if the driving means is driven a predetermined number of times or more or the position detecting means operates for a predetermined time or more.

Further, in the alignment apparatus for an ophthalmologic apparatus according to the second aspect of the present invention, the positions of the eye to be inspected and the eye to be examined are detected by the position detecting means, and the driving means is driven based on this detection signal so that the position is within the allowable amount. When performing the adjustment, if the driving means is driven a predetermined number of times or more, or if the position detecting means operates for a predetermined time or more, the operation of the driving means is stopped, the allowable amount is relaxed, and the above operation is repeated again. Align.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 shows a perspective view of this embodiment, which is composed of a main body 1 of the apparatus and a face fixing portion 2 of the subject. The main body part 1 is composed of an optometry part 3 and three stages that move the optometry part 3 in the three-dimensional X, Y, and Z-axis directions, and a groove is provided in the X-axis direction on a fixed part 4 serving as a base. The movable portion 5 is formed and inserted into this groove, and the male screw rod 6a of the motor 6 fixed to the fixed portion 4 is meshed with the female screw portion punched in the movable portion 5.

Similarly, a groove is formed in the Z-axis direction on the movable portion 5, and the movable portion 7 is inserted into the groove. The movable portion 7 is fixed to the motor 8 and its screw. It is meshed via a rod. Further, a groove is formed in the movable portion 7 in the Y-axis direction, and the optometry section 3 is inserted and fitted in the movable section 7. The optometry section 3 is meshed with a motor 9 on the movable section 7 via a screw rod thereof.

The motors 6, 8 and 9 are electrically connected to a drive control circuit (not shown) so that the eye examination unit 3 can be controlled to move to a predetermined position in the three-dimensional direction. The motors 6, 8 and 9 are pulse motors, DC
An arbitrary motor or the like may be used, but if the rotation cannot be quantitatively controlled like a DC motor, it is preferable to provide a detection element for detecting the movement distance of the stage and the rotation amount of the motor in the apparatus. .

FIG. 2 shows the structure of a position detection optical system for detecting the positions of the eye E to be inspected and the eye examination section 3 of the apparatus. The projection lens 10 and the eye E to be inspected are placed on the optical axis O1 in front of the eye E to be inspected. A light source 11 that illuminates the cornea Ec of the image forming lens 12 is arranged in two oblique directions of a predetermined angle symmetrical with respect to the optical axis O1.
a, 12b and two-dimensional position detecting means 13a, 13b are arranged. The two-dimensional position detecting means 13a and 13b include
A four-leaf element, an image pickup element such as a CCD, a position sensor, and the like, which can detect the light flux position in the two-dimensional direction, are used.

FIG. 3 shows a block diagram of an electric block circuit.
The outputs of the two-dimensional position detecting means 13a and 13b are connected to a switch 20 that selectively switches the output signal, and the output of the switch 20 is an A / D converter 21 that performs digital conversion.
Is connected to the image storage memory 22 via. The output of the image memory 22 is connected to the data bus 23, and the image memory 22, the CPU 24, and the ROM 2 are connected via the data bus 23.
5, the signals of RAM 26 are connected to each other, and further C
The signal from the PU 24 causes the motor 6 to move the stage,
Drivers 27, 28, 29 for driving 9 and 8 respectively
It is connected to the.

FIG. 4 shows a flow chart of the operation procedure. When the examiner presses an optometry start button (not shown), the CPU 24 recognizes the measurement start trigger, and the values such as the detection start time, the number of movements, and the allowable amount are initialized. To be done. At the same time, the light source 11
A light flux is emitted from the light source, and the light flux illuminates the cornea Ec of the eye E through the projection lens 10. As a result, the reflected image formed on the cornea Ec of the eye E to be examined is reflected by the optical path O1 of the projection optical system.
The two-dimensional position detecting means 13 is formed by the image forming lenses 12a and 12b which are arranged symmetrically with respect to each other in a direction forming a predetermined angle with
It is re-imaged on a and 13b.

The signals from the two-dimensional position detecting means 13a and 13b are selectively switched by the changeover switch 20 into the A / D converter 21.
Is input to and stored in the image memory 22 as digital information, and the information signal thus taken in is calculated by the CPU 24 or the like to calculate the position of the eye E to be inspected with respect to the eye examination unit 3.

The positions of the eye E to be inspected and the eye examination unit 3 are described in Japanese Patent Laid-Open No.
When the detection method disclosed in Japanese Unexamined Patent Application Publication No. 8-97340 is used to detect quantitatively in the three-dimensional direction and the amount is within the allowable range, optometry measurement is started. On the other hand, if it is not within the allowable amount, the control circuit such as the CPU 24 causes the drivers 27, 28, 2 to pass through the data bus 23.
By driving 9 and rotating each of the motors 6, 9 and 8 by a predetermined amount, the optometry unit 3 moves to a desired position in the three-dimensional direction.

Here, the position detecting operation of the eye E to be examined is repeated again, and it is automatically controlled so as to try the detection a predetermined number of times or perform the positioning for a predetermined time. If the position cannot be detected even after performing such a process, the examiner is notified of an error in the positioning by an error signal, and the positioning operation is stopped.

Therefore, when measuring an eye with poor fixation, it is possible to avoid the problem that the eye examination operation does not end because the alignment time is long and the alignment is not completed. The position can be switched by switching to, and the optometry can be ended.

FIG. 5 shows a flow chart of another operation procedure. In FIG. 4, the positioning operation is stopped when the positioning is not completed a predetermined number of times or within a predetermined time, but in FIG. After stopping the procedure, the allowable range is expanded and the same procedure is repeated again to perform the alignment. That is, when the movement of the optometry unit 3 by the driving means for alignment exceeds the predetermined number of times or when the alignment time is required for the predetermined time or longer, the allowable alignment amount is automatically relaxed and the alignment target is re-read. The position detection of the optometry E is continued.

In this way, if the optometry measurement is performed after the alignment is completed and the allowable amount at this time is stored and is displayed together with the optometry result at the end of the optometry, this result can be displayed as a normal optometry result. The examiner can determine at a glance that the value is in a state in which the optometry accuracy is lower than the case.

In the present embodiment, as shown in FIG. 1, the eye examination unit 3 is moved in the three-dimensional direction to perform the alignment. However, in ordinary ophthalmologic equipment, the eye E to be examined is used for alignment. An anterior ocular segment observation optical system is provided, and positioning can be performed with sufficient accuracy in the horizontal X direction and vertical Y direction, but with respect to the working distance Z direction, it is more accurate than in the X and Y directions. Has the drawback of being bad. Therefore, the method of the present embodiment may be adopted for the alignment in the working distance Z direction and may be used by incorporating it in the conventional device.

[0024]

As described above, in the alignment apparatus for an ophthalmologic apparatus according to the first aspect of the present invention, when the driving means is driven a predetermined number of times or more or the position detecting means operates for a predetermined time or more,
By stopping the alignment operation, it takes a lot of time to perform alignment when measuring the eye with poor fixation,
It is possible to avoid the state where the optometry is not completed because the alignment is not completed.

Further, the alignment device for an ophthalmologic apparatus according to the second aspect of the present invention automatically relaxes the allowable amount and performs the alignment when the alignment within the predetermined allowable amount is impossible. Even if the alignment accuracy is a little incomplete, automatic measurement can proceed, and even if the accuracy is sacrificed a little, the measurement is completed within a predetermined time, and the alignment is not completed forever and the optometry does not end. It can be avoided.

[Brief description of drawings]

FIG. 1 is a perspective view of the present embodiment.

FIG. 2 is a configuration diagram of a position detection optical system.

FIG. 3 is a configuration diagram of an electric block circuit.

FIG. 4 is a flow chart diagram.

FIG. 5 is a flowchart of another operation procedure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 main body part 2 face fixing part 3 optometry part 4 fixing part 5, 7 moving part 6, 8, 9 motor 11 light source 13a, 13b two-dimensional position detecting means 20 changeover switch 22 image memory 23 data bus 24 CPU

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshifumi Masaki 53 Imaiue-cho, Nakahara-ku, Kawasaki-shi, Kanagawa Canon Inc. Kosugi Plant (72) Inventor Satoshi Shimashita 53 Imaiue-cho, Nakahara-ku, Kawasaki, Kanagawa Inside the Kosugi Plant of Canon Inc.

Claims (2)

[Claims] 1. A position detecting means for detecting a relative position between an eye to be inspected and an eye examining portion, and a driving means for driving the eye examining portion in at least one-dimensional direction for alignment, the position detecting means. In the alignment device of the ophthalmologic apparatus that drives the drive means to perform the alignment based on the output of the above, it is detected that the drive means has been driven a predetermined number of times or more, or that the position detection means has operated for a predetermined time or more. In case,
A positioning device for an ophthalmologic apparatus, characterized in that the driving of the driving means is stopped. 2. A position detecting means for detecting a relative position between an eye to be inspected and an eye examining portion, and a driving means for driving the eye examining portion in at least a one-dimensional direction for alignment, the position detecting means. In the alignment device of the ophthalmologic instrument, which drives the drive means based on the output of the above, detects the position again, and ends the alignment by the distance between the eye to be inspected and the eye examination part being within a predetermined allowable amount. A position of the ophthalmologic instrument characterized by increasing the allowable amount and performing the alignment when detecting that the drive means has been driven a predetermined number of times or more or the position detection means has operated for a predetermined time or more. Matching device.