Interpupillary distance measuring tool

Abstract

The utility model discloses an interpupillary distance measuring tool which comprises a bottom plate, two symmetrically distributed vertical plate supports are fixedly installed on the outer wall of one side of the bottom plate, screw rod fixing blocks are fixedly installed above and below the outer wall of one side of each vertical plate support, and a vertical ball screw is rotatably inserted into the screw rod fixing block on one side of each vertical plate support. The vertical ball screw is sleeved with a sliding block matched with the vertical ball screw, and a transverse support is fixedly arranged on the outer wall of one side of the sliding block located outside the vertical ball screw. According to the height of different instruments to be measured, the height of the device can be adjusted by adopting the vertical ball screw, so that the device can be used more properly; laser marking is more accurate compared with other marks; compared with a common graduated scale, the digital display caliper can directly display a measurement result without reading scales, the measurement result is more accurate, and errors caused by human eye measurement are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pupil distance measurement, in particular to a pupil distance measurement tool. Background Art

[0002] Pupillary distance refers to the distance between the centers of the pupils of the human eye. This parameter is usually used in the production and wearing of glasses to ensure that the lenses of the glasses are properly aligned with the eyes, thereby providing the best visual correction effect. For optometry instruments with adjustable pupil distance, accurate pupil distance adjustment is a necessary condition to maximize the function of the instrument, and it is also a necessary condition to optimize the user experience, avoiding poor user experience or even visual function damage caused by instrument problems.

[0003] Currently, pupil distance measurement devices can be roughly divided into head-mounted and desktop types. Almost all measuring devices use a marker to align with the center of the pupil or the center of the lens of an ophthalmic instrument, use a ruler to measure the position of the marker, and calculate the pupil distance by reading the scale reading at the corresponding position of the marker.

[0004] The measurement accuracy of the above method is very limited, and certain errors will occur when aligning the markers and reading the scale. In addition, misreading may occur when reading the scale. At the same time, the pupil distance measurement device for ophthalmic instruments is very limited and the accuracy is not high, which is difficult to meet the requirements of measuring the pupil distance of lenses of ophthalmic instruments with adjustable pupil distance. Therefore, it is urgent to design a pupil distance measurement tool to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a pupil distance measuring tool to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A pupil distance measuring tool comprises a base plate, two symmetrically distributed vertical plate brackets are fixedly mounted on the outer wall of one side of the base plate, screw fixing blocks are fixedly mounted above and below the outer wall of one side of the vertical plate bracket, a vertical ball screw is rotatably inserted inside the screw fixing block on one side of the vertical plate bracket, a sliding block matching with the vertical ball screw is sleeved on the outside of the vertical ball screw, a horizontal bracket is fixedly mounted on the outer wall of one side of the sliding block located outside the vertical ball screw, a horizontal ball screw is rotatably inserted inside the screw fixing block on the outer wall of one side of the horizontal bracket, two symmetrically distributed caliper brackets are welded on the outer wall of one side of the horizontal bracket, and a digital caliper assembly is arranged on the caliper bracket, a laser frame is fixedly mounted on the outer wall of one side of the sliding block to which the horizontal ball screw is sleeved outside, a laser base is fixedly mounted on one side above the laser frame, and a laser source is fixedly mounted on one side of the laser base.

[0008] Preferably, a slot is formed on the outer wall of one side of the bottom plate, and the vertical plate bracket is embedded in the slot.

[0009] Preferably, a hand wheel is fixedly mounted on the outside of one end of the vertical ball screw and the transverse ball screw, and a screw support block is fixedly mounted on the outer wall of one side of the screw fixing block close to the hand wheel.

[0010] Preferably, a synchronous pulley is fixedly mounted on the outer wall of the bottom end of the two vertical ball screws, and the external transmission of the two synchronous pulleys is connected with a synchronous belt.

[0011] Preferably, a bearing is fixedly installed inside the screw fixing block, and the vertical ball screw and the transverse ball screw are both inserted into the bearing.

[0012] Preferably, the digital caliper assembly comprises a movable ruler and a fixed ruler, the movable ruler is provided with an emitting electrode sheet and a common receiving electrode, and the fixed ruler is provided with a shielding electrode sheet and a reflecting electrode sheet.

[0013] In the above technical solution, the utility model provides a pupil distance measurement tool, which has the following beneficial effects:

[0014] The utility model can use a vertical ball screw to adjust its height according to different heights of the instrument to be measured, so as to more appropriately meet the use; the use of laser marking is more accurate than other marks; the use of a digital caliper can directly display the measurement result without reading the scale, and the measurement result is more accurate, reducing the error caused by human eye measurement, improving the accuracy of pupil distance measurement, simplifying the operation of the device, and making the pupil distance measurement simpler and faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0016] Figure 1 The present invention provides a structural stereogram of an embodiment of a pupil distance measuring tool of the present invention.

[0017] Figure 2 A schematic diagram of the structure of a digital caliper assembly provided in an embodiment of the pupil distance measuring tool of the utility model.

[0018] Figure 3 The present invention provides an operation flow chart of an embodiment of a pupil distance measurement tool of the present invention.

[0019] 1 bottom plate, 2 vertical plate bracket, 3 slider, 4 screw fixing block, 5 screw support block, 6 vertical ball screw, 7 hand wheel, 8 synchronous belt, 9 synchronous pulley, 10 bearing, 11 digital caliper assembly, 12 horizontal bracket, 13 horizontal ball screw, 14 laser frame, 15 laser base, 16 caliper bracket, 17 laser source, 18 moving ruler, 19 fixed length, 20 emitter electrode, 21 common receiving electrode, 22 shielding electrode, 23 reflecting electrode. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0021] like Figure 1-3 As shown, a pupil distance measuring tool provided by an embodiment of the utility model comprises a base plate 1, two symmetrically distributed vertical plate brackets 2 are fixedly installed on the outer wall of one side of the base plate 1, screw fixing blocks 4 are fixedly installed above and below the outer wall of one side of the vertical plate bracket 2, a vertical ball screw 6 is rotatably inserted in the screw fixing block 4 on one side of the vertical plate bracket 2, a slider 3 matching therewith is sleeved on the outside of the vertical ball screw 6, a horizontal bracket 12 is fixedly arranged on the outer wall of one side of the slider 3 located outside the vertical ball screw 6, a horizontal ball screw 13 is rotatably inserted in the screw fixing block 4 on the outer wall of one side of the horizontal bracket 12, two symmetrically distributed caliper brackets 16 are welded on the outer wall of one side of the horizontal bracket 12, and a digital caliper assembly 11 is arranged on the caliper bracket 16, a laser frame 14 is fixed on the outer wall of one side of the slider 3 sleeved on the outside of the horizontal ball screw 13, a laser base 15 is fixedly installed on one side above the laser frame 14, and a laser source 17 is fixedly installed on one side of the laser base 15.

[0022] Specifically, in this embodiment, a bottom plate 1 is included. The bottom plate 1 is a right-angled trapezoid in side view, and has a long strip structure, which plays a supporting role so that the device can be balanced on the desktop. Two symmetrically distributed vertical plate brackets 2 are fixedly installed on the outer wall of one side of the bottom plate 1. The vertical plate brackets 2 are in the shape of a flat rectangular parallelepiped. The two vertical plate brackets are fixed on both sides of the bottom plate, and the structure is symmetrical, providing installation positions for the vertical screw rod fixing block and the screw rod supporting block, and providing space for the vertical adjustment of the device;

[0023] The structure on the vertical plate bracket 2 is symmetrically distributed on the left and right, and the structure on one side of the vertical plate bracket 2 is used as an example for explanation:

[0024] A screw fixing block 4 is fixedly installed above and below the outer wall of one side of the vertical plate bracket 2. The screw fixing block 4 fixes the relative positions of the vertical ball screw 6 and the horizontal ball screw 13 so that the screw will not move. The vertical ball screw 6 is rotatably inserted inside the screw fixing block 4 on one side of the vertical plate bracket 2. The vertical ball screw 6 is sleeved on the outside with a slider 3 that matches it. A horizontal bracket 12 is fixedly arranged on the outer wall of one side of the slider 3 outside the vertical ball screw 6. The horizontal bracket 12 is fixed on the outer wall on one side of the horizontal bracket 12. A transverse ball screw 13 is rotatably inserted inside the screw fixing block 4, two symmetrically distributed caliper brackets 16 are welded on the outer wall of one side of the transverse bracket 12, and a digital caliper assembly 11 is arranged on the caliper bracket 16, a laser frame 14 is fixed on the outer wall of one side of the slider 3 which is sleeved on the outside of the transverse ball screw 13, and a laser base 15 is fixedly installed on one side above the laser frame 14, and a laser source 17 is fixedly installed on one side of the laser base 15, and laser is emitted by the laser source 17 when measuring the pupil distance.

[0025] In one embodiment of the present invention, a slot is formed on the outer wall of one side of the bottom plate 1, and the vertical plate bracket 2 is embedded in the slot.

[0026] In another embodiment provided by the utility model, a hand-cranked wheel 7 is fixedly installed on the outside of one end of the vertical ball screw 6 and the transverse ball screw 13, and the rotation of the hand-cranked wheel 7 drives the rotation of the vertical ball screw 6 and the transverse ball screw 13. A screw support block 5 is fixedly installed on the outer wall of the screw fixing block 4 close to the hand-cranked wheel 7. The screw support block 5 maintains the vertical and horizontal postures of the vertical ball screw 6 and the transverse ball screw 13 to prevent the vertical ball screw 6 and the transverse ball screw 13 from shaking left and right or other offset movements.

[0027] As another embodiment provided by the utility model, a synchronous pulley 9 is fixedly installed on the outer wall of the bottom end of the two vertical ball screws 6, and the external transmission of the two synchronous pulleys 9 is connected with a synchronous belt 8. The synchronous pulleys 9 at the lower ends of the two vertical ball screws 6 are connected by the synchronous belt 8. When the hand-cranked wheel 7 on one side is rotated to rotate the vertical ball screw 6, the synchronous pulley 9 at the lower end of the vertical ball screw 6 rotates to drive the synchronous belt 8 to move, so that the synchronous pulley 9 on the other side drives the vertical ball screw 6 on that side to rotate at the same speed and in the same direction, and finally rotates at the same angle, so that the rotation of both sides is always synchronized, ensuring that the cross bracket is always level, avoiding the back-and-forth adjustment on both sides and the side slip or damage of the cross bracket caused by the asynchronous adjustment, and further improving the measurement accuracy.

[0028] As an embodiment provided by the utility model, a bearing 10 is fixedly installed inside the screw fixing block 4, and the vertical ball screw 6 and the transverse ball screw 13 are both inserted into the bearing 10. Through the bearing 10 structure, the vertical ball screw 6 and the transverse ball screw 13 can rotate in a fixed position without displacement.

[0029] In another embodiment provided by the utility model, the digital caliper assembly 11 includes a movable scale 18 and a fixed scale 19, the movable scale 18 is provided with an emitter plate 20 and a common receiving electrode 21, the fixed scale 19 is provided with a shielding stage 22 and a reflective electrode plate 23, and the front end of the laser frame 14 has a nested structure, which is nested on the digital caliper as the movable scale 18 part of the digital caliper. A caliper bracket is fixed between the horizontal bracket screw support block and the screw fixing block, and the two ends of the digital caliper are fixed on the caliper bracket, parallel to the horizontal bracket, as the fixed scale 19 part of the caliper. The electrode plates of the movable scale 18 and the fixed scale 19 are opposite to each other and parallel to each other, leaving a certain distance; when a certain voltage (generally the same voltage) is applied to each reflective electrode plate 23 on the fixed scale 19, the edge effect of the capacitor is not considered, and the induced voltage formed on the reflective stage of each reflective electrode plate 23 is proportional to the opposite area of ​​the two, and a voltage output is generated on the common receiving electrode 21 of the fixed scale through the same principle. A voltage with very strict frequency and phase is applied to the emitter. When stationary, the voltage of the reflector is proportional to the emitter and the phase is exactly the same. When the reflector moves relative to the emitter, due to the change in the area of ​​the capacitor, the voltage of the reflector will produce a certain phase shift, and the amplitude does not change much. This phase shift is also reflected on the common receiving electrode 21. At this time, the displacement can be calculated based on the frequency of the applied signal and the phase difference between the emitter and the reflector, and the accuracy can reach the micron level. Compared with grating, magnetic grating, and time grating displacement sensors, capacitive grating displacement sensors have a small size, low cost, and high accuracy, and can well achieve accurate distance measurement.

[0030] Working principle: When starting the measurement, place the instrument to be measured at the front end of the pupil distance measuring device, turn on the laser source 17, and shake the hand wheel 7 at the vertical plate bracket 2 on one side. The hand wheel 7 drives the vertical ball screw 6 to rotate, and at the same time, the synchronous pulley 9 at the bottom of the vertical ball screw 6 rotates, and the synchronous belt 8 drives the synchronous pulley 9 on the other side to rotate at the same speed and in the same direction, and stops at the same time and rotates at the same angle. The vertical ball screw 6 converts the rotational motion of the ball screw 6 into the linear motion of the slider 3 through the threaded structure, and the sliders 3 on the vertical ball screws 6 on both sides move up and down synchronously, driving the horizontal bracket 12 and the structure fixed on the horizontal bracket 12 to move up and down together. In this way, the measurement height is adjusted so that the laser emitted by the laser source 17 is located at the height of the lens of the device to be measured.

[0031] After the height adjustment is completed, the hand wheel 7 on the left side of the transverse ball screw 13 is turned, and the hand wheel 7 drives the transverse ball screw 13 to rotate, and the transverse ball screw 13 converts its own rotational motion into the horizontal linear motion of the slider 3. The laser base 15, the laser frame 14 and the laser source 17 are fixed on the slider 3, and the laser source 17 is in the on state. Turn the hand wheel 7, the transverse ball screw 13 rotates and drives the slider 3 to move, and the laser source 17 on the slider 3 is adjusted to emit laser light roughly at the center of the lens of the instrument to be tested. At this time, the hand wheel 7 of the vertical ball screw 6 and the hand wheel 7 of the transverse ball screw 13 can be fine-tuned to make the laser at the center of the lens, and the initial position adjustment is completed.

[0032] At this time, the slider 3 is located at a certain position on the digital caliper. The digital caliper is reset to zero through the zeroing function of the digital caliper, and this position is recorded as the starting point. Turn the hand wheel 7, and the transverse ball screw 13 rotates to drive the slider 3 to move. Adjust the position of the slider 3 until the laser emitted by the laser source 17 on the slider 3 irradiates the center of the lens on the other side of the instrument to be measured. According to the principle of the digital caliper, moving the slider is to move the moving scale of the digital caliper. The signal of the receiving pole of the moving scale and the signal of the transmitting pole of the static scale produce a phase difference and are reflected on the common receiving pole. The digital caliper calculates the moving distance of the slider based on the phase difference generated by the transmitting pole and the receiving pole, and displays the calculation result on the digital caliper. This is the pupil distance between the lenses of the instrument to be measured. After the measurement is completed, turn off the laser source.

[0033] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pupil distance measurement tool, comprising a base plate (1), characterized in that: Two symmetrically distributed vertical plate brackets (2) are fixedly mounted on the outer wall of one side of the base plate (1); screw fixing blocks (4) are fixedly mounted above and below the outer wall of one side of the vertical plate bracket (2); a vertical ball screw (6) is rotatably inserted into the screw fixing block (4) on one side of the vertical plate bracket (2); a sliding block (3) matching with the vertical ball screw (6) is sleeved on the outside of the vertical ball screw (6); a transverse bracket (12) is fixedly mounted on the outer wall of one side of the sliding block (3) outside the vertical ball screw (6); and a side of the transverse bracket (12) is provided with a plurality of screw fixing blocks (4). A transverse ball screw (13) is rotatably inserted inside the screw fixing block (4) on the outer wall, two symmetrically distributed caliper brackets (16) are welded on the outer wall of one side of the transverse bracket (12), and a digital caliper assembly (11) is arranged on the caliper bracket (16), and a laser frame (14) is fixed on the outer wall of one side of the slider (3) sleeved on the outside of the transverse ball screw (13), and a laser base (15) is fixedly installed on one side above the laser frame (14), and a laser source (17) is fixedly installed on one side of the laser base (15).

2. A pupil distance measurement tool according to claim 1, characterized in that: A slot is provided on the outer wall of one side of the bottom plate (1), and the vertical plate bracket (2) is embedded in the slot.

3. A pupil distance measurement tool according to claim 1, characterized in that: A hand wheel (7) is fixedly mounted on the outside of one end of the vertical ball screw (6) and the transverse ball screw (13), and a screw support block (5) is fixedly mounted on the outer wall of one side of the screw fixing block (4) close to the hand wheel (7).

4. A pupil distance measurement tool according to claim 1, characterized in that: A synchronous pulley (9) is fixedly mounted on the outer wall of the bottom end of the two vertical ball screws (6), and a synchronous belt (8) is connected to the external transmission of the two synchronous pulleys (9).

5. The pupil distance measurement tool according to claim 1, characterized in that: A bearing (10) is fixedly installed inside the screw fixing block (4), and the vertical ball screw (6) and the horizontal ball screw (13) are both inserted into the bearing (10).

6. A pupil distance measurement tool according to claim 1, characterized in that: The digital caliper assembly (11) comprises a movable ruler (18) and a fixed ruler (19); the movable ruler (18) is provided with an emitting electrode sheet (20) and a common receiving electrode (21); and the fixed ruler (19) is provided with a shielding electrode sheet (22) and a reflecting electrode sheet (23).

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