KR100399628B1 - Automatic Phoroptor for Eye-examination Having Improved Viewing Angle Changer - Google Patents

Abstract

The present invention relates to an auto optometrist for an optometry having a viewing angle adjusting device capable of automatically changing the direction of a line of sight for viewing a chart according to a position of an eye chart, and a horizontal frame including a driving shaft rotated by a driving means. ; A pair of disk bundles each including a plurality of vision inspection lenses; A disc bundle support shaft connecting the disc bundle and the horizontal frame so that the disc bundle can freely rotate with respect to the horizontal frame; A pair of first bevel gears mounted to face each other at a predetermined distance from the drive shaft; A pair of second bevel gears that rotate in engagement with the pair of first bevel gears; And an eccentric rotation member coupled to the rotation axis of the pair of second bevel gears, the eccentric rotation member for rotating the disk bundle about the disk bundle support shaft. .

Description

Automatic Phoroptor for Eye-examination Having Improved Viewing Angle Changer}

The present invention relates to an optometrist autohortor with an improved viewing angle changing device, and more particularly, a viewing angle adjusting device capable of automatically changing the direction of the eye of viewing a chart according to the position of an eye chart. It relates to an optometrist autohorter provided with.

Horobtor is a device to accurately measure the eye condition of the subject eye. It is a spherical lens, a cylindrical lens, a prism, a polarizing lens, a cross cylinder lens, and other special measures. The lenses are mounted on a plurality of disks, and the lenses are superimposed according to the distance to the pupil of the patient, and the eyesight of the subject is examined according to various lens powers, circumferential lens axis angles, and prism changes.

In general, such as an optician, using a trial lens set (trial lens set), by inserting a combination of several lenses to the frame, to find the lens of the appropriate power for the patient, through this method Tests that require eye disease or special prescriptions cannot be performed. In other words, it is possible to obtain the spherical power value for myopia and hyperopia and the cylinder value for astigmatism by using a trial lens set.However, the cylinder angle is precisely adjusted by looking at the angle scale of the cylinder with the naked eye. It is almost impossible to change, so even with the cross-cylinder method for finding a more precise astigmatism axis, it is very difficult to accurately find and prescribe the astigmatism axis of the patient. For the same reason, the prism prescription, which requires an accurate angle change depending on the patient, is also difficult to perform correctly using a trial lens set.

Therefore, the hobtor has been used instead of the trial lens set in an optometry operation of an ophthalmologist or a patient requiring a special prescription compared to the trial lens set. Horopters are equipped with Madox Rod, polarized lenses, and special lenses to facilitate inspection, so you can choose the angle change or the position change precisely. Therefore, more accurate eye examination can be performed. However, despite the accuracy of such inspections, conventional manual hoists have the disadvantage of being very complicated to use. For example, if you have a spherical power of -3.5 diopters and a cylinder power of -2.5 diopters, a -0.5 diopter lens will be placed behind the -3 diopters of spherical power lens to make -3.5 diopters. With a cylinder power of -1.0 diopter lens placed behind the -1.5 diopter lens, make -2.5 diopters. In other words, the four lenses must be superimposed to produce the required power, and the work must be manually adjusted by the operator. Since this process is a very cumbersome task for an optometrist, an automatic horror that can do this automatically has been developed and used.

In the case of the auto hotor, the patient who has the characteristics of the spherical power of -3.5 diopters and the cylinder power of -2.5 diopters as the example above, the optometrist enters the desired power, and the disks to which the respective lenses are assembled The disk is rotated automatically by the motor that controls the disk to produce the desired frequency. In addition, since the autohorter performs complicated optometry procedures automatically by the built-in program, the optometrist does not need to be familiar with the optometry procedure and perform the optometry depending on the memory. Therefore, the convenience of the optometry, the reduction of the optometry time, and the optometry Significant improvements have been made over manual hoists in terms of reliability of results.

As such, when performing presbyopic examination for older people among the features of the automatic houlter, which has several advantages over the manual houlter, accurate vision measurement is performed by changing the direction of the eye of the chart according to the position of the eye chart. There is an automatic viewing angle adjuster to make this happen. FIG. 1 schematically shows the shape of a conventional auto hobtor, and FIG. 2 is a view showing the positional relationship between the auto hobtor, the chart for visual inspection and the examinee. As shown in FIGS. The sight table 16 is viewed through the holes 14 formed in the two disk bundles 12 mounted on the horizontal frame 10 of the lopter. However, as shown in FIG. 3, there is no problem when the subject sees the chart 16a at a distance (typically 5 m) through the hobtor, but the chart 16b at the closest position (at least 30 cm) is not a problem. In the case of viewing, a difference occurs in the viewing angle and the position of the chart 16b. Therefore, in order to view the chart 16b through the fixed disk bundle 12a, the subject must apply the force to the pupil 18 to observe the chart 16b. do. As such, when the adjustment force enters the eye, it is difficult to achieve accurate optometry, so the disk bundle 12 of the horottor should be collected in the chart direction 16b (12a → 12b). In particular, since the chart for presbyopia inspection is installed in the position of 30, 35, 40, 45, 50, 55cm in front of the subject's eyes, the tilting angle of the disk bundle 12 to secure the viewing angle according to the distance should be changed.

4 schematically shows the structure of the hovel equipped with a conventional viewing angle changing device for changing the tilting angle of the disk bundle 12 as described above. As shown in FIG. 4, a typical hovel is a horizontal frame 10, a pair of disk bundles 12, and a disk that connects the disk bundle 12 and the horizontal frame 10 so as to rotate freely with each other. Bundle support shaft 20 is included. The drive shaft 22 in which a pair of worm gears 26 are formed is mounted in the horizontal frame 10, and a stepping motor 24 for rotating the drive shaft 22 is external to the horizontal frame 10. It is mounted on.

The worm gear 26 is engaged with the worm wheel 28 so as to rotate the worm wheel 28 and the disk bunch rotating shaft 30 fixed to the worm wheel 28 in a direction perpendicular to the direction of rotation of the drive shaft 22. . Here, the worm gear 26 and the worm wheel 28 are left and right threaded, respectively, to turn the disk bundle 12 in a symmetrical direction. The tilting shaft 32 is mounted to the disk bunch rotating shaft 30 with an eccentric value, and a bearing 34 for smoothly rotating the disk bunch 12 is assembled at the end of the tilting shaft 32. In addition, the disk bundle 12 is formed with a slot 36 for guiding the tilting shaft 32 and the bearing 34. At the end of the disk bundle rotating shaft 30, a pin 42 for operating the home position limit switch 40 is assembled.

Referring to the operation of changing the viewing angle of the conventional hooltor as follows. First, when the power is turned on, the stepping motor 24 is operated to rotate the worm gear 26 coupled to the drive shaft 22 and the drive shaft 22, and the worm wheel 28 is driven by the rotation of the worm gear 26. 22) rotate vertically. At this time, since the pair of worm gears 26 are processed with left and right screws, respectively, the worm wheel 28 also rotates to the right and left, respectively. As the worm wheel 28 rotates, the disk bundle rotating shaft 30 fixed thereto rotates in the same direction, and the tilting shaft 32 and the bearing 34, which are eccentrically assembled thereto, are eccentric relative to the worm wheel 28. Will be Since the bearing 34 is sandwiched between the rectangular slots 36 formed parallel to the disk bundle 12 in the longitudinal direction, the disk bundle 12 has a disk bundle support shaft (according to the eccentric rotational movement of the bearing 34). 20) will rotate around. Since the rotation angle of the disk bundle 12 is automatically set according to the distance between the chart and the horobtor, the optometrist can comfortably observe the chart in front through the hole 14 formed in the disk bundle 12. That is, when the optometrist or the user places the presbyopia inspection chart at a certain position (30, 35, 40, 45, 50, 55 cm) and specifies the position on the controller, the stepping motor 24 is required by the calculation formula already set. The worm gear 26 is rotated by a predetermined angle by rotating by a pulse. In Fig. 4, reference numeral 40 denotes a limiting switch for home positioning, and reference numeral 42 denotes a pin for operating the limit switch 40, and a pin 42 mounted on an upper portion of the disk bundle rotating shaft 30. When the limit switch 40 is operated, the control unit (not shown) of the machine recognizes the position as the origin.

Such a viewing angle change device of the horobtor according to the prior art has the following disadvantages. First, the gear for rotating the tilting shaft 32 is composed of a worm gear 26 and a worm wheel 28, so the processing and assembly of the hovel is not easy. In addition, the worm gear 26 and the worm wheel 28 is difficult to process, it is difficult to replace the injection molding, the production cost is high, there is a disadvantage that the operation is not smooth if the assembly distance does not fit correctly at the final assembly. Second, the worm gear 26 and the worm wheel 28 made of metal generate a large amount of debris due to friction, that is, metal powder, compared to the spur gear, and the metal powder generated as described above is attached to various lenses of the disk in the lower portion, As it obstructs the subject's vision, accurate examination is impossible and the horror must be repaired or cleaned after long-term use. Third, since the worm gear 26 typically has a reduction ratio of about 40: 1, when the worm wheel 28 needs to rotate one turn for the tilting of the disk bundle 12, the stepping motor 24 should rotate more than 20 wheels. Therefore, there is a disadvantage in that the waiting time of the subject or the optometrist becomes long.

Accordingly, it is an object of the present invention to provide an optometrist hovel equipped with a viewing angle changing device that is not only easy to process and assemble, but also does not require the use of a worm gear and a worm wheel which may be easily worn. Another object of the present invention is to provide an optometrist hovel equipped with a viewing angle changing device, in which the subject or optometrist does not need to wait for a long time for changing the viewing angle of the horobator. Still another object of the present invention is to provide an optometrist hotor equipped with a viewing angle changing device which can reduce contamination by metal powder and thus requires little repair and cleaning.

1 is a schematic representation of the shape of a conventional auto hobtor.

2 is a view showing the positional relationship between the automatic hobbler, the subject and the chart for visual inspection.

3 is a view for explaining the process of changing the viewing angle of the automatic hobbler according to the position of the chart for visual inspection.

4 is a schematic diagram of an optometrist hobtor structure with a conventional viewing angle changing device.

5 is a schematic diagram of an optometrist hobtor structure with improved viewing angle changing device in accordance with one embodiment of the present invention.

In order to achieve the above object, the present invention is a horizontal frame including a drive shaft rotated by a drive means; A pair of disk bundles each including a plurality of vision inspection lenses; A disc bundle support shaft connecting the disc bundle and the horizontal frame so that the disc bundle can freely rotate with respect to the horizontal frame; A pair of first bevel gears mounted to face each other at a predetermined distance from the drive shaft; A pair of second bevel gears that rotate in engagement with the pair of first bevel gears; And an eccentric rotation member coupled to the rotation axis of the pair of second bevel gears, the eccentric rotation member for rotating the disk bundle about the disk bundle support shaft. .

Here, it is preferable that the drive shaft and the drive means transmit power by gears and pinions so as to improve rotational torque, and the bevel gears are preferably made of acetal synthetic resin.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In the accompanying drawings, the same reference numerals are given to members having the same functions as the prior art for the convenience of description.

The present invention relates to the improvement of an automatic hotar for performing various eye tests, and in particular, when the near vision table is installed in front of the patient for the presbyopic examination, the patient can see the vision table comfortably and accurately. The present invention relates to an improvement of a tilting mechanism for changing a viewing window viewing angle. The structure of an optometrist hotor equipped with an improved viewing angle changing device according to an embodiment of the present invention is schematically illustrated in FIG. 5. As shown in FIG. 5, the hobtor according to an embodiment of the present invention includes a horizontal frame 10, a pair of disk bundles 12 including a plurality of vision inspection lenses, and the disk bundle 12 and the disk bundles 12. Horizontal frame 10 includes a disk bundle support shaft 20 for connecting so as to rotate freely with each other. Inside the horizontal frame 10, a drive shaft 22 in which a pair of first bevel gears 26 are fitted is mounted, and drive means such as a stepping motor 24 for rotating the drive shaft 22 is provided in the horizontal frame. It is attached to the outside of (10). Since the drive shaft 22 and the stepping motor 24 are connected by a gear 54 and a pinion 56 for giving a reduction ratio, the drive shaft 22 is driven by reducing the rotation speed of the stepping motor 24. can do.

The first bevel gear 50 is vertically engaged with the second bevel gear 52, so that the second bevel gear 52 and the disk bunch rotating shaft 30 fixed thereto are rotated according to the rotation of the drive shaft 22. It rotates perpendicularly to the rotation direction of the drive shaft 22. Here, the pair of first bevel gears 50 are mounted on the drive shaft 22 to face each other, so that the pair of second bevel gears 52 and the disk bundle 12 are rotated in opposite directions. have. At the lower end of the second bevel gear 52, for example, the lower end of the disk bundle rotating shaft 30, an eccentric rotation member for rotating the disk bundle 12 around the disk bundle supporting shaft 20 is mounted. An example of the eccentric rotation member may include a tilting shaft 32 mounted with an eccentric value at the end of the disk bundle rotating shaft 30, and an opposite end of the eccentric rotating member such as the tilting shaft 32 may be provided. The disk bundle 12 is fitted in a rectangular slot 36 formed in parallel in the longitudinal direction. At the distal end of the tilting shaft 32, a bearing 34 for smoothly rotating and moving the tilting shaft 32 in the slot 36 may be further assembled.

In addition, any one of the second bevel gears 52 may be mounted such that an axis (not shown) that rotates together with the disk bundle rotating shaft 30 does not overlap with the driving shaft 22 or the second bevel gear ( 52, a third bevel gear 60 is mounted on the opposite surface of the first bevel gear 50, and a shaft 62 having protrusions 64 formed on the third bevel gear 60 is formed. And a photo interrupter 66 capable of detecting movement of the protrusion 64 of the rotary shaft 62 by rotating the disk bundle rotating shaft 30 together with the disk bundle rotating shaft 30. When it comes to a predetermined position it can be used to detect the origin of the disk bundle (12).

Next, the operation of changing the viewing angle of the hovel according to the embodiment of the present invention will be described. When power is applied to the houlter, the stepping motor 24 operates to rotate the drive shaft 22, and the pair of second bevel gears 52 engages with the first bevel gear 50 assembled to the drive shaft 22. Rotate in opposite directions. At this time, since the first bevel gear 50 is mounted on the drive shaft 22 to face each other, the pair of second bevel gears 52 and the disk bundle 12 rotate in opposite directions. The first and second bevel gears 50 and 52 may be made of, for example, synthetic resin of an acetal system, and may be assembled while confirming that there is little debris due to friction between the gears and that the gears are firmly contacted during assembly. This eliminates the need to adjust the assembly distance exactly as with worm gears.

In the horotator according to the exemplary embodiment of the present invention, when the first bevel gear 50 rotates once, the disk bundle rotating shaft 30 also rotates once, so that the disk bundle 12 according to the operation of the stepping motor 24 is rotated. Angular tilting occurs quickly. That is, when the worm gear is used, it has a reduction ratio of about 40: 1, but when the bevel gears 50 and 52 are used, the gear 54 and the pinion 56 are about 5: 1 to improve the torque of the stepping motor 24. Since only the reduction ratio of the step, the tilting time is significantly shorter than the conventional. When the disc bundle rotating shaft 30 rotates by the rotation of the second bevel gear 52, the tilting shaft 32 and the tip of the tilting shaft 32 are eccentrically assembled to the disc bundle rotating shaft 30. The bearing 34 has an eccentric motion relative to the disk bunch rotating shaft 30. Since the bearing 34 is sandwiched between the rectangular slots 36 formed in parallel in the longitudinal direction to the disk bundle 12, the disk bundle 12 is the disk bundle support shaft (according to the eccentric rotational movement of the bearing 34) It rotates by the amount of eccentricity around 20). Since the rotation angle of the disk bundle 12 is automatically set according to the distance between the chart and the horobtor, the optometrist can comfortably observe the chart in front through the hole 14 formed in the disk bundle 12. In the process, as the third bevel gear 60 mounted to engage the first bevel gear 50 on the opposite surface of the second bevel gear 52 rotates, the protrusion mounted on the third bevel gear 60 is rotated. The shaft 62 on which the 64 is formed also rotates, and the photo interrupter 64 mounted on the horizontal frame 10 detects the movement of the protrusion 64 and recognizes the position as the origin. It is possible to select the origin more precisely than the existing mechanical type.

Summarizing the above, when the optometrist or the examinee places the presbyopia inspection chart at a certain position (30, 35, 40, 45, 50, 55cm) and specifies the position on the controller, the stepping motor 24 is a calculation formula already set. Rotates the drive shaft 22 by the required pulse. According to the rotation of the drive shaft 22, the disk bunch rotating shaft 30 engaged with the first and second bevel gears 50 and 52 rotates, and a tilting shaft assembled eccentrically to the disk bunch rotating shaft 30 ( 32 moves by the amount of eccentricity, and rotates the disk bundle 12 suspended from the horizontal frame 10 by the support shaft 20 about the support shaft 20, so that the optometrist comfortably relaxes the chart near the front. For viewing, the sight window of the houter can be tilted in the direction of the sight table.

As described above, the optometrist autohorter equipped with the improved viewing angle changing device according to the present invention uses a bevel gear that can be manufactured by injection, so that the system can be configured at a much lower cost than a worm gear. In addition, the automatic optometrist for the optometrist equipped with the improved viewing angle changing device according to the present invention does not have to wait for a long time for the examinee or optometrist to change the viewing angle of the hoult, and can reduce contamination by metal powder, thereby increasing the service life of the hooper This has an extended effect.

Claims (4)

A horizontal frame including a drive shaft rotated by the drive means; A pair of disk bundles each including a plurality of vision inspection lenses; A disc bundle support shaft connecting the disc bundle and the horizontal frame so that the disc bundle can freely rotate with respect to the horizontal frame; A pair of first bevel gears mounted to face each other at a predetermined distance from the drive shaft; A pair of second bevel gears that rotate in engagement with the pair of first bevel gears; And An optometry optometrist having an improved viewing angle changing device coupled to a rotation axis of the pair of second bevel gears, the eccentric rotation member for rotating the disc bundle about the disc bundle support axis. 2. An optometry optometrist with an improved viewing angle change device according to claim 1, wherein said drive shaft and said drive means transmit power by gears and pinions to improve rotational torque. 2. The optometrist hobtor according to claim 1, wherein the bevel gear is made of an acetal synthetic resin. According to claim 1, wherein the eccentric rotation member is a tilting shaft mounted with an eccentric value on the lower end of the second bevel gear, the opposite end of the tilting shaft to fit in a rectangular slot formed parallel to the disk bundle in the longitudinal direction An optometrist hobtor having an improved viewing angle change device, characterized in that.