JP3810233B2 - Ophthalmic equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ophthalmologic apparatus that performs measurement, observation, imaging, and the like of an eye to be examined.
[0002]
[Prior art]
In an ophthalmologic apparatus such as an objective eye refracting power measuring apparatus, it is desirable to stabilize the face of the subject (eye to be examined) for accurate examination. For this reason, the stationary device is provided with a headrest that supports the face of the subject, but even a small device such as a hand-held device is provided with a forehead that can be moved back and forth from the measurement unit equipped with the inspection optical system. Is known. The forehead support is configured to be always pushed forward by a predetermined amount by an urging means such as a spring.
[0003]
[Problems to be solved by the invention]
However, the apparatus configured as described above has the following problems.
[0004]
When the subject is in the back, the distance for moving the measuring unit to the subject side becomes long, so that it takes time to align the working distance, and the subject is also burdened.
[0005]
In addition, when aligning the other eye after the inspection of one eye is completed, the forehead pad returns to a certain position again, so that the same alignment time is required and the inspection efficiency is poor.
[0006]
In view of the above-described drawbacks of the prior art, an object of the present invention is to provide an ophthalmologic apparatus that can perform an examination efficiently without imposing a burden on the subject or the examiner.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is characterized by having the following configuration.
[0008]
(1) An inspection optical system for inspecting the eye to be examined and an alignment system for aligning the eye to be examined with respect to the inspection optical system while the examiner observes the eye to be examined with the observation optical system. In the ophthalmologic apparatus including the housing that houses the forehead, the forehead includes a forehead that contacts the forehead of the subject, and a biasing unit that is attached to the housing and biases the forehead toward the subject. The support means for supporting the abutment so as to be movable in the front-rear direction with respect to the housing, and when the forehead approaching the support means side beyond the feeding position that changes stepwise, the feeding position exceeds the feeding position to the subject side. It has a restricting means for restricting the movement of the forehead pad and a releasing means for releasing the restriction of the restricting means, and comprises a feed amount varying means for changing the feed position stepwise .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, a hand-held objective eye refractive power measurement device will be described as an embodiment.
[0012]
(Embodiment 1)
FIG. 1 is a side view of a measuring apparatus and a subject according to the present invention, and FIG. 2 is a top view thereof. Reference numeral 2 denotes an apparatus main body, in which a measurement optical system 20 for measuring the eye refractive power of one eye of the subject 1 is housed. As this measurement optical system, for example, the one described in Japanese Patent Application Laid-Open No. 10-108836 by the present applicant can be used. The eye refractive power is measured by projecting a measurement index onto the eye to be examined, detecting light reflected from the fundus by a light receiving element, and measuring based on the detection result. However, this measurement optical system itself is not related to the present invention. Therefore, the explanation is omitted.
[0013]
The light beam from the measurement optical system 20 passes through the measurement window 4 and is projected onto the eye to be examined, and the reflected light beam from the fundus passes again through the measurement window 4 and is received by the internal optical system.
[0014]
3 is a forehead for the subject 1. The forehead pad 3 is slid in the direction of arrow A (the back side of the apparatus). By making the forehead pad 3 abut the forehead of the subject 1 at the time of measurement, an appropriate alignment distance can be secured while stabilizing the measuring device 2 against the face of the subject 1. The front portion of the forehead pad 3 is slightly rounded so as to be suitable for the curvature of the subject's forehead when the left and right eyes are measured. Furthermore, it is preferable to attach a soft resin or the like to the contact surface so that a fit with the forehead can be obtained.
[0015]
A liquid crystal display (LCD) 5 is arranged on the examiner side of the measuring apparatus 2 and alignment is performed while observing the eye to be examined displayed on the LCD 5 at the time of measurement. The LCD 5 displays information such as measurement data. Reference numeral 6 denotes a control unit for performing measurement, function switching, and the like.
[0016]
FIG. 3 is a top view for explaining the slide mechanism of the forehead pad 3, and FIG. 4 is a cross-sectional view taken along line BB of FIG.
[0017]
A slide plate 31 that moves integrally and two parallel rods 12 that extend in the front-rear direction are attached to the forehead support 3, and the rear ends of the parallel rods 12 are holes provided in the support plate 13. Is inserted. The parallel rod 12 serves as a guide when sliding. A compression spring 11 is attached between the forehead support 3 and the support plate 13 so as to cover the two parallel rods 12. Thereby, the forehead support 3 is always urged to the front side at the time of sliding, and the positional relationship between the eye to be examined and the apparatus can be stabilized to ensure an appropriate working distance.
[0018]
Grooves 32a, 32b, and 32c are formed at the center of the upper surface of the slide plate 31 for changing the amount of the forehead pad 3 in three stages. By fitting the ball plunger 15 in this groove, the range in which the forehead pad 3 moves is limited.
[0019]
The ball plunger 15 is attached to the knob 14, and the knob 14 can move in the left-right direction along the groove 16 formed in the body cover 10, and by selecting any position of the grooves 32 a, 32 b, 32 c The amount of the forehead pad 3 can be changed. Further, if the distance of the groove 32c is shortened and the ball plunger 15 is fitted in the groove 32c in a state where the forehead pad 3 is fully inserted in the direction A in FIG. The entire device can be made compact when packed or carried.
[0020]
Next, the operation at the time of measurement in the apparatus having the above configuration will be described.
[0021]
When performing the measurement, the examiner holds the measuring device 2 with both hands and brings the measurement window 4 to the front of the eye to be examined. Since the anterior segment image captured by the TV camera housed inside the apparatus main body 2 is displayed on the LCD 5, the approximate position is adjusted so that the anterior segment image comes to the center of the screen while viewing the screen. deep. Next, a forehead pad 3 is applied to the subject's forehead so that the reticle displayed on the LCD 5 and the alignment index projected on the eye to be in a predetermined relationship (alignment index and reticle can be known ones). ) Adjust the alignment in the vertical and horizontal directions and the front and rear working distance directions.
[0022]
At the time of this alignment, when the measuring apparatus main body 2 is moved in the direction of the subject 1, the forehead pad 3 is moved toward the apparatus main body 2 by the above-described slide mechanism. On the other hand, the compression spring 11 is pressed and compressed by the forehead pad 3, and the compressed spring tries to return to its original state. For this reason, since the forehead support 3 can always maintain contact with the forehead of the subject, the positional relationship with the eye to be examined can be stabilized.
[0023]
Here, the alignment state in the case of the subject 1a whose eyes are not so deep with respect to the forehead, such as an Oriental, is that the forehead pad 3 is the subject as shown in the side view of FIG. It will be in the state where it has come out long in the direction. On the other hand, in the case of the subject 1b at the back like a Westerner, the forehead pad 3 is considerably retracted to the back of the apparatus as compared with the subject 1a as shown in FIG. 5 (b). . That is, if the ball plunger 15 is positioned in the groove 32a at the time of measurement of the person at the back, the amount of the forehead pad 3 that is fed out is the largest. The distance moved to the subject side becomes long, and alignment takes time.
[0024]
Therefore, when measuring the back person such as the subject 1b, the knob 14 is slid in the direction of the groove 16 with the forehead pad 3 pushed into the apparatus main body 2 side, and the position where the ball plunger 15 fits is set to the groove 32b, Or it switches to the groove | channel 32c. If the feeding amount of the forehead pad 3 is set to be small, the moving distance after starting to hit the subject's forehead is shortened, the alignment time can be shortened, and the inspection can be performed efficiently.
[0025]
When the alignment adjustment can be performed by using the forehead pad 3 in this way, the examiner performs measurement by pressing the measurement switch in the control unit 6. Since the alignment can be performed smoothly as described above, the burden on the subject at the time of measurement can be reduced.
[0026]
(Embodiment 2)
The second embodiment is an example of a mechanism in which the forehead pad 3 slides to the side facing the subject and the operating range does not return to the subject side from the changing point when the operating range exceeds the changing point. is there. Hereinafter, only different parts from the first embodiment will be described.
[0027]
FIG. 6 is a diagram illustrating the configuration of the slide mechanism of the forehead pad 3 in the second embodiment. In addition, the same code | symbol is attached | subjected to the component similar to Embodiment 1, and the description is abbreviate | omitted.
[0028]
A slide plate 40 is integrally attached to the forehead pad 3. A high flat surface portion 42a, a middle flat surface portion 42b, and a low flat surface portion 42c are stepped on the upper surface of the slide plate 40 in order from the rear side (right side in the figure). It is formed in a shape. Reference numerals 43a, 43b, and 43c denote stepped step portions in each plane. Reference numeral 54 denotes a stopper, which is always urged by the leaf spring 51 to any one of the high plane part 42a, the middle plane part 42b, and the low plane part 42c. The stopper 54 rotates about the shaft 53 supported by the main body cover 10 by pushing the connecting rod 52 downward.
[0029]
Similarly to the first embodiment, two parallel rods 12 are attached to the forehead support 3 and the slide plate 40, and the parallel rod 12 is attached so as to cover the compression spring 11. Is always biased forward.
[0030]
The operation of the forehead pad 3 in such a slide mechanism will be described.
In the state of FIG. 6A, the forehead pad 3 is biased forward by the compression spring 11, but a stopper 54 biased downward by the leaf spring 51 holds down the stepped step 43 a. Therefore, the feeding of the forehead pad 3 is restricted at this position. At this time, the amount of feeding of the forehead pad 3 is the largest.
[0031]
In this state, first, for example, the right eye of the subject is first aligned and measured. When the subject has a relatively deep eye, when the forehead pad 3 is put on the subject's forehead and the apparatus main body 2 is pushed toward the subject side, the stopper 54 slides on the high flat surface portion 42a, and the stairs It goes over the flat step 43b and reaches the middle flat surface part 42b. Assume that the alignment of the right eye is completed in the state of FIG.
[0032]
After the measurement of one eye is finished, when the apparatus main body 2 is moved away from the subject as it is, the forehead pad 3 is pushed forward by the urging force of the compression spring 11, but at this time the stopper 54 slides on the middle plane 42b, As shown in FIG. 6 (c), the forehead pad 3 is stopped from coming out in front of the stepped step 43b.
[0033]
Next, in this state, alignment for measuring the left eye, which is the other eye, is performed. In the case of the same subject, the working distances of the left and right eyes are almost the same, so in the measurement of the left eye, alignment can be performed from a state in which the amount of the forehead pad 3 is less than that of the right eye, and measurement can be performed efficiently It can be carried out. Of course, as with the first embodiment, for the subject at the back, the amount of the forehead pad 3 may be reduced from the right eye measurement stage.
[0034]
In addition, in order to return to the state of Fig.6 (a) from the state of FIG.6 (c) in which the amount of feeding of the forehead pad 3 was changed, the end which has come out from the cover 10 of the connecting rod 52 is made downward. Press it. Since the stopper 54 attached to the other end of the connecting rod 52 rotates around the shaft 53, the lock with the step 43b is released, and the forehead pad 3 is pushed forward by the force of the compression spring 11. The stopper 54 hits the stepped step 43a, stops the forehead pad 3 from coming forward, and stops at the position shown in FIG.
[0035]
Further, if the forehead pad 3 is pushed in all the way and the stopper 54 stops at the position of the stepped step 43c, the amount of protrusion of the forehead pad 3 from the entire apparatus can be reduced, and the entire apparatus during packing or carrying. Can be made compact.
[0036]
In the first and second embodiments described above, the compression spring is used as the urging of the forehead pad 3 toward the subject. However, air pressure or hydraulic pressure may be used to change the pressure of the spring.
[0037]
Furthermore, in the present embodiment, a hand-held eye refractive power measuring device has been described as an example.However, the present invention is a variety of devices for observing and photographing the eye to be examined, including hand-held and stationary types, and performing other measurements and examinations. Applicable to ophthalmic devices.
[0038]
【The invention's effect】
As described above, according to the present invention, it is possible to efficiently inspect the person in the back and reduce the burden on the subject and the examiner.
[Brief description of the drawings]
FIG. 1 is a side view of an apparatus according to an embodiment and a subject.
FIG. 2 is a top view of the apparatus of the embodiment and a subject.
FIG. 3 is a top view of a forehead support portion of the apparatus according to the first embodiment.
4 is a cross-sectional view taken along the line BB in FIG. 3 of the forehead padding portion of the apparatus according to the first embodiment.
FIG. 5 is a side view comparing a case where a subject measures a person in the back and a normal person with the apparatus of the embodiment.
FIG. 6 is a side cross-sectional view of a forehead support portion of the apparatus according to the second embodiment.
[Explanation of symbols]
2 Measuring device 3 Forehead support 11 Compression spring 12 Parallel rod 13 Support plate 14 Knob 15 Ball plunger 16 Groove 31 Slide plate 40 Slide plate 51 Plate spring 52 Connecting rod 53 Shaft 54 Stopper

Claims (1)

  An inspection optical system for inspecting the eye to be examined, and an alignment system for aligning the eye to be examined with respect to the inspection optical system while the examiner observes the eye to be examined by the observation optical system, and houses the inspection optical system and the alignment system An ophthalmologic apparatus including a housing includes a forehead abutting against a subject's forehead and an urging means attached to the housing for biasing the forehead toward the subject and the forehead rest. The support means that supports the body so as to be movable in the front-rear direction, and when the forehead approaching the support means side beyond the feeding position that changes stepwise, the forehead is placed on the subject side beyond the feeding position. An ophthalmologic apparatus comprising: a restricting unit that restricts movement; and a releasing unit that releases the restriction of the restricting unit; and a feeding amount varying unit that changes a feeding position stepwise.

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