Optometry unit with rotation driving mechanism of light beam deflection component

Abstract

The utility model discloses an optometry unit with a rotation driving mechanism of a light beam deflection component, relates to the technical field of optometry units, and aims to solve the problem that the existing optometry unit cannot eliminate stray light and decoherence. The optometry unit comprises an optometry platform base and an optometry detection light path, the optometry detection light path is arranged on the optometry platform base, and the light beam deflection component is arranged on the optometry platform base. The optometry detection light path comprises a light beam deflection component, the light beam deflection component is rotatably arranged on the optometry platform base, coherence of stray light and a laser light source on the light path is eliminated through rotation of the light beam deflection component, and the light beam deflection component is driven by a power source to rotate, so that light beams on the optometry detection light path are deflected to eliminate the stray light and the coherence; the power source is provided with a hollow shaft straight cylinder and connected with the controller, the light beam deflection component is directly communicated with the power source, no other transmission component is arranged, and the structure is simple.

Description

Technical Field

[0001] The utility model relates to the technical field of optometry instruments, and more specifically to an optometry instrument with a rotation driving mechanism of a light beam deflecting component. Background Art

[0002] The current computer ophthalmometer uses an objective measurement method. It projects infrared images to the fundus of the human eye with the help of the optometry detection optical path, and generates scattered images on the retina of the human eye and reflects them back into the optometry detection optical path. By analyzing the measurement images collected by the high-precision CMOS (Complementary Metal Oxide Semiconductor), the refractive power of the eye can be objectively calculated. Due to the limitations of the light source, most computer ophthalmometers use laser lights as projection light sources. Lasers have incomparable advantages in the display field due to their high brightness, monochromaticity, and directionality. However, lasers have coherent characteristics. If they are directly used as light sources for projection without decoherence treatment, we will see images with obvious interference fringes on the receiving screen, which is the so-called speckle, which greatly affects the quality of infrared images and measurement images. Therefore, the optometry detection optical path requires a rotating prism to perform a rotational motion to decoherence.

[0003] At the same time, the projection light emitted by the laser lamp will generate additional stray light through multiple reflections between the lens surfaces or mechanism reflections. This stray light is harmful light and is unexpected light in the optical measurement system. When this stray light is also projected onto the CMOS, unnecessary bright spots will be generated on the captured image, reducing the imaging contrast and imaging quality, which is not conducive to measurement accuracy. This stray light must be eliminated or suppressed, so the prism needs to be rotated and rotated on the optometry detection optical path. When the light beam passes through the rotating prism, it will be deflected, and the light expected to be used for measurement will reach the measured human eye, and a scattered image will be generated on the retina of the human eye and reflected back into the optometry detection optical path. After the stray light is deflected, it will not be reflected back into the optometry detection optical path, and no bright spots not used for optometry calculation will be generated on the CMOS captured image.

[0004] In the prior art, all ophthalmometers have an active synchronous wheel on the output shaft of the driving motor, which fixes the rotating prism on the rotating lens barrel. The rotating lens barrel is provided with a driven synchronous wheel, which is provided with a rotating bearing. The active synchronous wheel and the driven synchronous wheel are connected by a synchronous belt transmission. The rotational vibration of the driving motor is transmitted to the rotating prism, which will cause unexpected optical axis deviation and failure. Unexpected optical axis deviation will affect the measurement position in the pupil and may cause a decrease in measurement accuracy. In addition, the sound caused by the rotational vibration brings discomfort to the examiner and the examinee, and the synchronous belt drive frequently turns and stops suddenly, which is easy to cause the belt to crack and the measurement function to fail. In addition, the rotation drive mechanism is very complicated, occupies a large space, has many parts, and is not convenient and economical to assemble and maintain.

[0005] Therefore, how to solve the problem of the complex structure of the rotation drive mechanism of the existing ophthalmometer is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide an ophthalmometer with a rotating drive mechanism of a beam deflecting component. The beam deflecting component is arranged to eliminate coherence and stray light, and the power source has a hollow shaft straight cylinder arrangement so that the beam deflecting component directly passes through the power source to simplify the structure.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] An optometre having a rotation drive mechanism for a beam deflecting member, comprising:

[0009] Optometry platform base;

[0010] The optometry detection optical path is arranged on the optometry platform base, and the optometry detection optical path includes a light beam deflecting component, and the light beam deflecting component is rotatably arranged on the optometry platform base. The light beam deflecting component is driven to rotate by a power source to deflect the light beam on the optometry detection optical path to eliminate stray light and coherence. The power source has a hollow shaft straight cylinder and is connected to the controller.

[0011] Preferably, the power source is arranged on the base of the optometry platform through a fixed bracket, the power source includes a fixed structure and a rotating structure, the rotating structure is provided with a hollow shaft straight cylinder, the fixed structure is provided with a circular hole for matching the hollow shaft straight cylinder, and the fixed structure and the rotating structure are rotatably connected.

[0012] Preferably, both end surfaces of the beam deflecting component are inclined surfaces with an inclination, and the beam deflecting component is a rotating prism.

[0013] Preferably, the beam deflecting member is disposed in the hollow shaft cylinder.

[0014] Preferably, a shoulder for fixing the beam deflecting component is provided in the hollow shaft cylinder.

[0015] Preferably, balance bearings are provided at both ends of the circular hole, and the balance bearings are pressed onto the outer circumference of the hollow shaft.

[0016] Preferably, a coaxial annular groove is provided on the outer periphery of the hollow shaft cylinder, and the annular groove is used for installing the electromagnetic induction magnetic ring.

[0017] Preferably, a plurality of electromagnetic induction magnetic rings are provided, and the plurality of electromagnetic induction magnetic rings are evenly arranged in the circumferential direction of the annular groove.

[0018] Preferably, a plurality of positioning portions corresponding to the electromagnetic induction magnetic ring are provided in the circumferential direction of the annular groove, one end of the electromagnetic induction magnetic ring abuts against the positioning portion, and the other end of the electromagnetic induction magnetic ring abuts against the balance bearing.

[0019] Preferably, the end surface where the fixing structure is connected to the fixing bracket is provided with at least two threaded holes, and the fixing structure is fixed to the fixing bracket by the cooperation of bolts and the threaded holes.

[0020] The utility model provides an optometry instrument with a rotating drive mechanism of a light beam deflecting component, which comprises an optometry platform base and an optometry detection optical path. Specifically, the optometry detection optical path is arranged on the optometry platform base, and the optometry detection optical path comprises a light beam deflecting component, which is rotatably arranged on the optometry platform base, and the stray light on the optical path and the coherence of the laser light source are eliminated by the rotation of the light beam deflecting component. The light beam deflecting component is driven to rotate by a power source, so that the light beam on the optometry detection optical path is deflected to eliminate the stray light and the coherence. The power source has a hollow shaft straight cylinder and is connected to a controller, and the light beam deflecting component is directly connected to the power source, and no other transmission components are provided, so the structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of an optometer provided by the utility model having a rotation drive mechanism of a light beam deflecting component;

[0023] Figure 2 A schematic diagram of the structure of the power source and the light beam deflection component provided by the utility model;

[0024] Figure 3 A schematic diagram of the structure of the power source provided by the utility model;

[0025] Figure 4This is a structural schematic diagram of the light beam deflection component provided by the utility model.

[0026] Reference numerals:

[0027] 1- Optometry platform base;

[0028] 2- beam deflection member;

[0029] 3- Power source;

[0030] 4-Fix the bracket;

[0031] 5-Fixed structure;

[0032] 6- Rotation structure. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] The core of the utility model is to provide an optometry instrument with a rotating drive mechanism of a beam deflecting component. By arranging the beam deflecting component 2 to eliminate coherence and stray light, the unique arrangement of the power source 3 can reduce vibration and noise during the rotation process.

[0035] Please refer to Figure 1 An optometre with a rotation driving mechanism of a beam deflecting component comprises an optometre platform base 1 and an optometre detection optical path.

[0036] Specifically, the optometry detection optical path is arranged on the optometry platform base 1, and the optometry detection optical path includes a beam deflecting component 2, and the beam deflecting component 2 is rotatably arranged on the optometry platform base 1, and the stray light and the coherence of the laser light source on the optical path are eliminated by the rotation of the beam deflecting component 2. The beam deflecting component 2 is driven by the power source 3 to rotate, so that the light beam on the optometry detection optical path is deflected to eliminate stray light and coherence. The power source 3 has a hollow shaft straight cylinder and is connected to the controller. The beam deflecting component 2 is directly connected to the power source 3, and there are no other transmission components, and the structure is simple.

[0037] In the ophthalmometer with a rotating drive mechanism of a light beam deflecting member arranged in the above manner, the power source 3 has a hollow shaft straight cylinder design. When the power source 3 is powered on, the light beam deflecting member 2 is directly driven to rotate by the power source 3, which can reduce the vibration of the power source 3 and the light beam deflecting member 2 during rotation, thereby reducing the rotation noise. The light beam on the optometry detection optical path is deflected by the rotation of the light beam deflecting member 2, which can be decoupled and the remaining stray light on the optometry detection optical path can be eliminated.

[0038] Please refer to Figure 2 and Figure 3 The power source 3 is arranged on the optometry platform base 1 through a fixed bracket 4. The power source 3 includes a fixed structure 5 and a rotating structure 6. The rotating structure 6 is provided with a hollow shaft straight cylinder. The fixed structure 5 is provided with a circular hole for matching the hollow shaft straight cylinder. The fixed structure 5 and the rotating structure 6 are rotatably connected.

[0039] It should be noted that a power source 3 is fixed on the fixed bracket 4, and the power source 3 is divided into a fixed structure 5 and a rotating structure 6 that rotates relative to the fixed structure 5. The fixed structure 5 is directly fixed to the side of the fixed bracket 4, and the rotating structure 6 is designed with a hollow shaft straight cylinder feature. The fixed structure 5 is provided with a circular hole that cooperates with the hollow shaft straight cylinder, and the hollow shaft straight cylinder is directly sleeved in the circular hole, so that the rotating structure 6 can rotate relative to the fixed structure 5.

[0040] Please refer to Figure 4 The two end surfaces of the beam deflecting member 2 are inclined surfaces with inclinations, and the beam deflecting member 2 is a rotating prism.

[0041] It can be understood that the optometry detection optical path includes a projection optical path for irradiating light onto the eye to be tested, and a measurement optical path for receiving light reflected from the eye to be tested. The light beam deflection component 2 is simultaneously arranged on the projection optical path and the measurement optical path through the power source 3. The light beam deflection component 2 is tilted relative to the optical axis of the optical path, so as to eliminate stray light on the optical path and coherence of the laser light source.

[0042] Furthermore, the beam deflecting member 2 is disposed in the hollow shaft cylinder.

[0043] It should be noted that the beam deflecting component 2 is directly fixed in the hollow shaft cylinder of the rotating structure 6 of the power source 3, and the rotating structure 6 of the power source 3 directly drives the beam deflecting component 2 to rotate, which can avoid connecting other transmission components to reduce rotation fluctuations.

[0044] In the above embodiment, a shoulder for fixing the beam deflecting member 2 is provided in the hollow shaft cylinder.

[0045] It can be understood that the cylindrical surface of the beam deflecting member 2 matches with the axial hole of the hollow straight shaft of the rotating structure 6 , and a shoulder is provided in the axial hole to achieve axial positioning of the beam deflecting member 2 .

[0046] On the basis of the above embodiment, balance bearings are provided at both ends of the circular hole, and the balance bearings are pressed onto the outer circumference of the hollow shaft.

[0047] It should be noted that a circular hole is designed inside the fixing structure 5 of the power source 3, and balance bearings for rotation support are press-fitted at both ends of the circular hole.

[0048] In the above embodiment, a coaxial annular groove is provided on the outer periphery of the hollow shaft cylinder, and the annular groove is used to install the electromagnetic induction magnetic ring.

[0049] It can be understood that the rotating structure 6 of the power source 3 is integrally designed with a thin-walled concentric circular ring feature coaxial with the hollow shaft cylinder, and the electromagnetic induction magnetic ring is evenly nested on the inner circumference of the circular ring.

[0050] As a preferred implementation, a plurality of electromagnetic induction magnetic rings are provided, and the plurality of electromagnetic induction magnetic rings are evenly arranged in the circumferential direction of the annular groove.

[0051] It should be noted that, by energizing the electromagnetic induction magnetic ring, a magnetic field is generated to drive the rotating structure 6 and the beam deflecting component 2 to rotate synchronously.

[0052] In the above situation, a plurality of positioning parts corresponding to the electromagnetic induction magnetic ring are provided in the circumferential direction of the annular groove, one end of the electromagnetic induction magnetic ring abuts against the positioning part, and the other end of the electromagnetic induction magnetic ring abuts against the balance bearing.

[0053] It can be understood that when the power source 3 is powered on, the rotating structure 6 of the power source 3 can realize rotational motion under the action of electromagnetic force, and an electromagnetic induction coil is nested and fixed in the middle part of the hollow shaft straight cylinder. The hollow shaft straight cylinder passes through the circular hole in the fixed structure 5 and can rotate with the inner ring of the balance bearing.

[0054] In the above embodiment, at least two threaded holes are provided on the end surface where the fixing structure 5 is connected to the fixing bracket 4 , and the fixing structure 5 is fixed to the fixing bracket 4 by the cooperation of bolts and the threaded holes.

[0055] It should be noted that, in the present embodiment, the fixing structure 5 and the fixing bracket 4 are connected by bolts, but in actual life, there is no limitation on the connection method between the fixing structure 5 and the fixing bracket 4, as long as the above-mentioned technical effect can be achieved.

[0056] In summary, the optometry instrument with a rotating drive mechanism of a beam deflecting member provided by the utility model directly drives the rotating prism to rotate by the rotating structure 6 of the power source 3, thereby deflecting the light beam on the detection optical path to eliminate stray light, so that the optometry detection optical path can accurately measure the axis position, astigmatism and diopter data of the eye being tested. The power source 3 operates stably and reliably, has a simple structure, a small overall size, is easy to install and maintain, is low in cost, and has a low noise effect.

[0057] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0058] The above is a detailed introduction to an optometry instrument with a rotating drive mechanism of a beam deflecting member provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. An optometre having a rotation drive mechanism for a beam deflecting member, characterized in that: include: Optometry platform base (1); The optometry detection optical path is arranged on the optometry platform base (1), and the optometry detection optical path includes a light beam deflection component (2). The light beam deflection component (2) is rotatably arranged on the optometry platform base (1), and the light beam deflection component (2) is driven to rotate by a power source (3) to deflect the light beam on the optometry detection optical path to eliminate stray light and coherence. The power source (3) has a hollow shaft straight cylinder and is connected to a controller.

2. The optometry instrument having a rotation drive mechanism of a beam deflecting member according to claim 1, characterized in that: The power source (3) is arranged on the optometry platform base (1) via a fixed bracket (4), and the power source (3) comprises a fixed structure (5) and a rotating structure (6), wherein the rotating structure (6) is provided with the hollow shaft straight cylinder, and the fixed structure (5) is provided with a circular hole for matching with the hollow shaft straight cylinder, and the fixed structure (5) and the rotating structure (6) are rotatably connected.

3. The ophthalmometer having a rotation drive mechanism of a beam deflecting member according to claim 2, characterized in that: The two end surfaces of the light beam deflecting component (2) are inclined surfaces with an inclination, and the light beam deflecting component (2) is a rotating prism.

4. The optometry instrument having a rotation drive mechanism of a beam deflecting member according to claim 3, characterized in that: The light beam deflecting component (2) is arranged in the hollow shaft cylinder.

5. The optometry instrument having a rotation drive mechanism of a beam deflecting member according to claim 4, characterized in that: A shaft shoulder for fixing the light beam deflecting component (2) is arranged inside the hollow shaft cylinder.

6. The optometry instrument having a rotation drive mechanism of a beam deflecting member according to claim 5, characterized in that: Balance bearings are provided at both ends of the circular hole, and the balance bearings are pressed onto the outer circumference of the hollow shaft.

7. The optometry instrument having a rotation drive mechanism of a beam deflecting member according to claim 6, characterized in that: A coaxial annular groove is provided on the outer periphery of the hollow shaft cylinder, and the annular groove is used for installing an electromagnetic induction magnetic ring.

8. The optometry instrument having a rotation drive mechanism of a beam deflecting member according to claim 7, characterized in that: The electromagnetic induction magnetic rings are provided in plurality, and the plurality of electromagnetic induction magnetic rings are evenly arranged in the circumferential direction of the annular groove.

9. The optometry instrument having a rotation drive mechanism of a beam deflecting member according to claim 8, characterized in that: A plurality of positioning parts corresponding to the electromagnetic induction magnetic ring are provided in the circumferential direction of the annular groove, one end of the electromagnetic induction magnetic ring abuts against the positioning part, and the other end of the electromagnetic induction magnetic ring abuts against the balance bearing.

10. The ophthalmometer having a rotation drive mechanism of a beam deflecting member according to any one of claims 2 to 9, characterized in that: The end surface where the fixing structure (5) is connected to the fixing bracket (4) is provided with at least two threaded holes, and the fixing structure (5) is fixed to the fixing bracket (4) by the cooperation of bolts and the threaded holes.

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