JPH08126608A - Ophthalmic apparatus - Google Patents

Abstract

PURPOSE: To certainly prevent an eye to be examined from abnormally approaching an ophthalmoscopic means by providing a position detecting means for detecting the relative position between a movable part on which the ophthalmoscopic means is placed and a fixed stand in a forward and rearward direction and operating a movement prescribing means preventing the abnormal approach to an eye to be examined on the basis of the detected position data. CONSTITUTION: In a tonometer, a movable part 2 and a measuring part 3 are arranged on a fixed stand 1 so as to be freely movable before and behind as well as left and right with respect to an examinee S and a jaw stand 4 supporting the face of the examinee S is provided on the fixed stand. At the time of measurement, the measuring part 3 is aligned with an eye E to be examined while the anterior part of the eye E to be examined displayed on an observation monitor 9 is observed by the anterior part observing part in an optical unit 17. At this time, the position of the movable part 2 with respect to the fixed stand 1 is detected by a position detector 5 and the moving quantity of a stopper 6 is determined from the detection result and a proper operation distance by a control circuit 11 to lock the stopper 6. By this constitution, the abnormal approach of the measuring part 3 to the eye to be examined is certainly prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus capable of safely performing optometry during optometry in an ophthalmic hospital, an eyeglass store, or the like.

[0002]

2. Description of the Related Art A conventional non-contact tonometer is disclosed in JP-A-1-27.
As disclosed in Japanese Patent No. 4737, the movable part is moved horizontally and vertically with respect to the fixed base to align the eye with the eye to be inspected, and the working distance between the eye to be inspected and the device is detected by the alignment detecting means. An approach prevention unit is provided to prevent the apparatus from approaching the eye to be inspected for a predetermined distance or more. The approach preventing means in this case is composed of a stop mechanism for preventing the movable portion from moving more than necessary with respect to the fixed base, and a retracting mechanism for retracting the movable portion.

There is also known an example of detecting the horizontal relative position between the movable part and the fixed base, but this is not provided with a restricting means for preventing access to the eye to be examined.

[0004]

However, the above-mentioned conventional example does not detect the relative position of the fixed base and the sliding base, but uses the alignment optical system at the time of the optometry to make the eye and the optometry part. The distance is being detected. Therefore, the position detection can be performed only when the eye to be inspected and the eye examination portion are almost opposed to each other,
The range that can be detected as a safety device is extremely narrow.
Further, when the device is aligned in the horizontal direction or the vertical direction with respect to the eye to be inspected, the working distance of the device is detected by the reflected light from the eye to be inspected. The tip of the device may come into contact with.

Further, since there is no means for displaying the operating state of the means for preventing the abnormal approach to the eye to be inspected, the examiner forgets to set the approach preventing means, and the aligning operation cannot be performed at ease. Furthermore, if the next subject is aligned without canceling the setting of the approach prevention means when the subject is replaced, the amount of movement for alignment is insufficient, or an abnormal approach causes a dangerous condition. Sometimes it becomes.

The object of the present invention is to solve the above-mentioned problems,
The present invention provides an ophthalmologic apparatus including a mechanism that prevents the tip of the apparatus from contacting the eye to be inspected.

[0007]

An ophthalmologic apparatus according to a first aspect of the present invention for achieving the above object is to fix an optometry means for projecting a light beam onto an eye to be examined and an optometry means, and a movable portion on which the optometry means is mounted. In the ophthalmologic apparatus including a positioning unit that horizontally moves with respect to the table to perform relative positioning of the eye to be inspected and the eye examining unit, and a movement restricting unit that prevents abnormal approach to the eye to be inspected, the movable unit and the It is characterized in that it has position detecting means for detecting the relative position of the fixed base in the front-rear direction, and control means for operating the movement restricting means based on the position information of the position detecting means.

An ophthalmologic apparatus according to a second aspect of the present invention comprises an optometry means for projecting a light beam onto an eye to be examined, and an optometry means for moving the optometry means horizontally with respect to a movable part and a fixed base on which the optometry means is mounted. It is characterized in that it has a positioning means for performing relative positioning, a movement regulating means for preventing abnormal approach to the eye to be inspected, and a display means for displaying an operating state of the movement regulating means.

An ophthalmologic apparatus according to a third aspect of the present invention comprises an optometry means for projecting a light beam onto an eye to be examined and an optometry means for moving the optometry means horizontally with respect to a movable part and a fixed base on which the optometry means is mounted. Positioning means for performing relative positioning, movement restricting means for preventing abnormal approach to the eye to be inspected, and restricting conditions according to the operation involved when the subject changes the restricting conditions of the movement restricting means. It is characterized by having a regulation condition releasing means for releasing.

[0010]

In the ophthalmologic apparatus of the first invention having the above-described structure, when the eye examination means and the eye to be examined are relatively aligned, the movable table on which the eye examination means is mounted is moved in the front-back direction with respect to the fixed table. The relative position at this time is sequentially detected by the position detecting means, and the movement restricting means is operated by the control means based on the position information to prevent the eye to be inspected from abnormally approaching the eye examining means.

The ophthalmologic apparatus of the second invention is provided with display means for displaying the operating state of the means for preventing abnormal approach to the eye to be inspected so that the setting of the approach preventive means can be confirmed and the examiner is prevented from forgetting to set. .

The ophthalmologic apparatus of the third invention is provided with means for canceling the setting of the approach preventing means in response to the input operation when the subject is replaced, and the position is adjusted when the next subject is aligned. It is possible to prevent the amount of movement for alignment from becoming insufficient, or to prevent a dangerous situation due to abnormal proximity.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 shows a block diagram of this embodiment of the tonometer,
The movable part 2 and the measuring part 3 are arranged on the fixed base 1 so as to be movable back and forth, left and right with respect to the subject S.
Is provided with a chin rest 4 that supports the face of the subject S. The movable table 2 is said to move forward, backward, leftward and rightward, and the measuring section 3 moves vertically with respect to the movable section 2 so that the eye E to be examined can be aligned. A position detector 5 is provided between the fixed base 1 and the movable portion 2 so that the position of the movable portion 2 moving in the front-rear direction with respect to the fixed base 1 can be detected over the entire stroke.

Further, the movable portion 2 is provided with a stopper 6, an operating rod 7, an operating panel 8, an observation monitor 9 and a control circuit 11 having a memory 10 built therein. Wires are connected. On the other hand, in the measuring unit 3, the nozzle 12, the objective lens 13, the air chamber 14,
A piston 15, a solenoid 16, and an optical unit 17 are arranged. Inside the optical unit 17, a measurement light source, an alignment detection unit, a deformation detection unit, and an anterior eye observation unit are provided.

FIG. 2 is a side view of the position detector 5, showing a slit plate 18 having a thin slit formed on the plane of the fixed base 1.
Is erected vertically in the front-back direction, and this slit plate 1
A photo interrupter 19 is fixed to the slide member 20 so as to straddle the eight. The slide member 20 is the bearing 2
It is possible to slide on the two guide shafts 22 fixed to the movable portion 2 in the left-right direction via 1. With such a configuration, the photo interrupter 19 can move along the slit plate 18 as the movable section 2 moves in the front-rear direction regardless of the movement of the movable section 2 in the left-right direction. The photo interrupter 19 detects each slit of the slit plate 18 when moving the part 2 to the examiner side as an initial position in the memory 10 in the control circuit 11 and moving from there to the subject S side. The current position in the front-rear direction can be detected by pulse counting this in the control circuit 11.

FIG. 3 shows a side view of the stopper 6, in which a retainer 26 is built in a housing 25 fixed to the movable portion 2 side and a stopper shaft 27 is sandwiched. A part of the stopper shaft 27 has a tooth shape and a gear 28 is meshed with the brake shaft. A brake receiving portion 29 is provided on a concentric circle of the gear 28, and a brake driving portion 30 is provided above the gear 28 on the movable portion 2 side.
Is fixed, and a pair of brake arms 31 are fixed to the brake drive unit 30 via a shaft 32. The brake drive unit 30 opens and closes the brake arm 31 in the direction of arrow P, and the brake pad 33 at the tip of the brake arm 31 presses or releases the brake receiving unit 29. A belt 34 is hung on the back side of the gear 28,
The opposite side of the belt 34 is stretched around a shaft of a pulse motor 35 fixed to the movable portion 2. The brake drive unit 30 and the pulse motor 35 are electrically connected to the control circuit 11.

FIG. 4 shows the arrangement of keys on the operation panel 8 arranged in the vicinity of the operation rod 7, in which a menu switch 41, a safety lock switch 42, and a print switch 43 for setting the mode related to the measurement operation are arranged. Has been done. Further, FIG. 5 shows a display screen of the observation monitor 9, in which an anterior segment image E ′ of the eye E to be measured, a measurement value T, a display C of the left and right eyes,
The brake lock display L is displayed.

At the time of eye examination, the examiner instructs the subject S to put his face on the chin rest 4, and the safety lock switch 4
Press 3 to set the safety lock mode to the set standby state. By operating the anterior ocular segment observation unit of the measurement unit 3, the anterior ocular segment image E ′ of the eye E to be inspected is displayed on the display screen of the observation monitor 9, and the examiner looks at the image E ′ of the anterior segment of the eye E to measure the measurement unit. Align 3 At this time, the brake lock display L on the upper left of the screen of the observation monitor 9 is in a blinking state.

When the eye E to be inspected is aligned with an appropriate measurement position, a signal is sent from the alignment detection section of the measurement section 3 to the control circuit 11, and the position detector 5 outputs the current fixed base 1.
A pulse signal for the position of the movable part 2 is sent to the stopper shaft 2 from the signal of the position detector 5 and a predetermined proper working distance.
The movement amount of 7 is determined by the control circuit 11. A pulse signal is sent to the pulse motor 35 of the stopper 6 and the brake drive unit 30, the gear 28 rotates, and the stopper shaft 27 moves by a predetermined distance, and then the gear 28 is locked by the brake arm 31. Stopper shaft 2 locked in this way
7 moves integrally with the movable portion 2, and when it abuts on the protrusion of the fixed base 1, the movable portion 2 does not move further forward.

When the safety lock is set, the brake lock display L at the upper left of the screen of the observation monitor 9 changes from a blinking state to a lighting state, and the examiner can confirm that the brake is locked by this, and thereafter, It is possible to measure intraocular pressure with confidence. When the lock is set, the examiner cannot move the movable portion 2 closer to the eye E from the proper working distance by a predetermined distance or more, so that the measurement unit 3 shifts in the left-right direction and the eye E cannot be observed. However, the operation can be performed safely, and the work can be performed without problems even when the movable portion 2 is moved to switch between the left and right eyes. The once set brake lock is reset by pressing the print switch 43 to output the measured value.

By this reset, the restriction of the safety lock of the previous subject is released, so that when the next subject is aligned, the movement amount of the alignment becomes insufficient,
It is possible to avoid a dangerous situation due to abnormal proximity.

As described above, in this embodiment, when the relative position between the measuring section 3 of the tonometer and the eye E is to be adjusted,
The movable part 2 on which the measuring part 3 is placed is moved in the front-rear direction with respect to the fixed base 1, the relative position at this time is detected by the position detector 5, and the stopper 6 is operated based on this position information.
It is possible to prevent the tonometer and the eye E to be inspected from abnormally approaching each other.

Further, when the information from the alignment detecting unit cannot be obtained or in the case of an ophthalmologic apparatus having no alignment detecting unit, when the eye image E'to-be-inspected is substantially in focus when the observation monitor 9 is observed, the examiner can take safety measures. If the lock switch 43 is pushed to lock the brake, the approach prevention can be performed as in the above-described embodiment.

Even if the safety lock switch 43 is not provided, the position detector 5 detects this pulse signal when the operator inclines the operating rod 7 three times when the working distance becomes substantially appropriate, for example. It is also possible to set to lock when the pulse counting interval within a predetermined time satisfies a predetermined condition.

As described above, the safety lock is set on the basis of the information from the alignment detection section and the observation of the observation monitor 9. However, the measurement position of the movable section 2 in the front-rear direction has a narrow movement range and is set at a substantially predetermined position. Since it can be fixed, a predetermined relative position between the movable portion 2 and the fixed base 1 can be determined in advance, and the lock can be applied when the predetermined position is reached. Further, the past measurement position of the subject S detected by the position detector 5 is stored in the memory 10 of the control circuit 11, and a lock is applied so that the subject S does not approach a predetermined distance or more even if the subject S takes over. You may do it. Then, if the lock is applied at the predetermined position in this way, or if the control for locking at the measurement position in the past is performed in combination with the above-described embodiment, a safer and more reliable intraocular pressure measurement can be performed. it can.

FIG. 6 is a perspective view of another structure of the position detector 5, in which a striped pattern 45 is formed on the upper surface of the fixed base 1 and a reflection type detection sensor 46 is provided on the movable portion 2 side. A light source is provided inside the reflection type detection sensor 46, and the light flux can be photoelectrically converted into a pulse waveform signal having a high contrast by irradiating the stripe pattern 45. Since the line group of the striped pattern 45 extends along the moving direction of the movable portion 2, it can be detected even when the movable portion 2 is moving.

Although the above description has been made on the tonometer, it can be similarly applied to an ophthalmologic apparatus such as an autorefractometer, a keratometer and a fundus camera.

In the ophthalmologic apparatus of the present embodiment as described above, a special alignment detection unit is not required, and the mutual alignment positions of the eye to be inspected and the apparatus are not detected,
Since it is possible to prevent the approach, it is possible to safely perform the ophthalmologic measurement while avoiding a malfunction due to an optical cause such as external light. Further, since it is possible to surely prevent the approach of the predetermined distance or more without sequentially setting the approach prevention position, it is not necessary to perform a complicated operation such as changing the setting for each subject.

[0029]

As described above, the ophthalmologic apparatus according to the first aspect of the present invention sequentially detects the relative position between the movable portion and the fixed base to prevent the eye examining means from approaching the eye to be examined abnormally. Without having a special alignment detection mechanism,
It is possible to prevent contact between the eye to be inspected and the eye examining means and perform a safe operation, and avoid malfunction due to external light or the like.

In the ophthalmologic apparatus according to the second aspect of the present invention, by providing the display means for displaying the operating state of the means for preventing the abnormal approach to the eye to be inspected, the setting of the approach preventive means can be confirmed and the examiner forgets to set it. Prevents the error and can perform the alignment operation with peace of mind.

The ophthalmologic apparatus according to the third aspect of the present invention is provided with a means for canceling the setting of the approach preventing means in response to the input operation when the subject is replaced, so that the next subject can be aligned. In addition, it is possible to prevent the amount of movement for alignment from becoming insufficient, or to prevent an abnormal approach and a dangerous state.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment.

FIG. 2 is a side view of a position detector.

FIG. 3 is a side view of a stopper.

FIG. 4 is a front view of an operation panel.

FIG. 5 is a front view of an observation monitor.

FIG. 6 is a perspective view of another position detector.

[Explanation of symbols]

 1 Fixed Stand 2 Movable Part 3 Measuring Part 5 Position Detector 7 Observation Monitor 9 Control Circuit 10 Stopper 11 Operation Panel 17 Optical Unit

Front page continued (72) Inventor Satoshi Shimashita 53 Imaiue-cho, Nakahara-ku, Kawasaki-shi, Kanagawa Canon Inc. Kosugi Plant (72) Inventor Toshifumi Masaki 53 Imaiue-cho, Nakahara-ku, Kawasaki-shi, Kanagawa Canon Inc. Kosugi Office

Claims (4)

[Claims] 1. An eye examination means for projecting a light beam onto an eye to be inspected and an movable portion on which the eye examination means is placed are horizontally moved with respect to a fixed base to perform relative alignment between the eye to be inspected and the eye examination means. In an ophthalmologic apparatus including a position aligning unit and a movement restricting unit that prevents abnormal approach to an eye to be inspected, a position detecting unit that detects a relative position in the front-rear direction between the movable unit and the fixed base, and the position detecting unit. And a control unit that operates the movement restricting unit based on the position information of 1. 2. The ophthalmologic apparatus according to claim 1, wherein the control means controls the movement restricting means so as to restrict the approach of a predetermined distance or more based on the position information of the position detecting means at the time of past eye examination. 3. An optometry means for projecting a light beam onto an eye to be inspected, and a movable part on which the optometry means is mounted and a fixed base are horizontally moved to perform relative alignment between the eye to be inspected and the optometry means. An ophthalmologic apparatus comprising: a positioning means, a movement restricting means for preventing abnormal approach to an eye to be inspected, and a display means for displaying an operation state of the movement restricting means. 4. An optometry means for projecting a light beam onto an eye to be inspected, and a movable part on which the optometry means is placed and a fixed base are horizontally moved to perform relative alignment between the eye to be inspected and the optometry means. Positioning means, movement restricting means for preventing abnormal approach to the eye to be inspected, and restriction condition releasing means for canceling the restricting conditions according to the operation involved when the examinee changes the restricting conditions of the movement restricting means. An ophthalmic device having: