JP3526091B2 - Ophthalmic equipment - Google Patents

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 safety lock means is released each time the measurement of the subject is completed
The object of the present invention is to provide an ophthalmologic apparatus that facilitates alignment .

[0007]

SUMMARY OF THE INVENTION An ophthalmologic apparatus according to the present invention for achieving the above object comprises an optometry means for projecting a light beam onto an eye to be examined, and an optometry means for mounting the optometry means relative to a fixed base. A movable portion that is movable to the relative position, relative position detection means that detects the relative position of the movable portion with respect to the fixed base, and safety lock means for preventing abnormal movement of the movable portion to the subject's eye. The lock position setting means for setting the lock position of the safety lock means based on the output of the relative position detection means, and the display means for displaying the operating state of the safety lock means are obtained by the optometry means.
It is characterized in that the setting of the lock position is released according to a switch operation for outputting a measured value .

[0008]

[0009]

[0010]

In the ophthalmologic apparatus of the present invention having the above-described structure, the lock position of the safety lock means is released for each subject in accordance with the switch operation for outputting the measured value , and the safety lock means Display status.

[0011]

[0012]

[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 is 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 meshes therewith, 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 driving 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 to be inspected E, 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 see 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 the lock at the past measurement position is performed in combination with the above-described embodiment, it is possible to perform more reliable and reliable intraocular pressure measurement. 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 present invention is accompanied by the switch operation for outputting the measured value,
Each time the examinee changes, the setting of the lock position of the safety lock means is released to facilitate alignment, and the state of the safety lock means is displayed.

[0030]

[0031]

[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 base 2 movable parts 3 measuring section 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, Kanagawa Canon Inc. Kosugi Plant (72) Inventor Toshifumi Masaki 53, Imaiue-cho, Nakahara-ku, Kawasaki, Kanagawa Canon Inc. Kosugi Business In-house (56) Reference JP-A-3-94727 (JP, A) JP-A-6-142044 (JP, A) JP-A-63-212317 (JP, A) JP-A-61-243515 (JP, A) JP-A-4-96730 (JP, A) JP-A-1-274737 (JP, A) JP-A-2-265525 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) A61B 3/00-3/16

Claims (3)

(57) [Claims] 1. An optometry means for projecting a light beam onto an eye to be examined, an movable part on which the optometry means is mounted and movable relative to a fixed base, and a relative position of the movable part to the fixed base. Relative position detecting means for detecting various positions, safety lock means for preventing abnormal movement of the movable part to the subject's eye, and setting the lock position of the safety lock means based on the output of the relative position detecting means Lock position setting means,
A display unit for displaying the operating state of the safety lock unit, and outputs the measurement value obtained by the optometry unit.
An ophthalmologic apparatus, wherein the setting of the lock position is released in response to a switch operation for performing the operation. 2. When the safety lock means is in the lock standby state, the display means indicates that it is in the standby state, and when the lock position of the safety lock means is set, the display means sets the lock position. The ophthalmologic apparatus according to claim 1, wherein the display means indicates that the lock position of the safety lock means is released, and the display means indicates that the safety lock means is released. 3. The ophthalmic apparatus according to claim 1, wherein the switch for outputting the measured value is <br/> print switch.