High-precision angle measuring device
By adopting the design of fan-shaped optical code disk and linear array sensor in physical optical instruments, combined with friction shaft and miniature bearing, the problems of high price and large size of high-precision absolute encoder are solved, and a high-precision, low-cost miniaturized angle measurement device is realized.
Patent Information
- Application Number
- CN202510832603.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-20
- Publication Date
- 2025-09-23
AI Technical Summary
Existing high-precision absolute encoders are expensive and bulky, making it difficult to meet the cost-effectiveness and miniaturization requirements of domestic physical optical instruments.
The use of sector optical code disks and linear array sensors, combined with friction shafts and miniature bearings, achieves high-precision angle measurement, eliminates the need for a real rotating shaft, and optimizes space utilization using the three-point tangency principle.
While achieving high-precision angle measurement, it reduces costs and shrinks the size of the device, making it suitable for miniaturized physical optics instruments.
Smart Images
Figure CN120685015A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of measurement technology, and specifically relates to a high-precision angle measurement device. Background Art
[0002] At present, in the field of physical optical instruments such as automatic polarimeters and automatic refractometers, high-resolution angle encoders are required to achieve high-precision angle measurement. By entering the angle value into the algorithm formula, various physical quantities can be measured. Among them, high-precision absolute encoders with an accuracy of 0.001° on the market are usually monopolized by foreign companies, and are relatively expensive, often around 50,000 yuan, which seriously affects the cost-effectiveness of such domestic physical optical instruments; these encoders are also relatively large in size (they need to rotate bearings such as Figure 1 This severely impacts instrument miniaturization. Due to the instrument's specific usage, the measured angular range is relatively small. For example, the maximum angular range of an automatic polarimeter is ±90°, and that of an automatic refractometer is ±25°. Using a commercially available high-precision absolute encoder (with a 360° measurement range) with such a small measurement range would be wasteful. Summary of the Invention
[0003] In order to solve the above technical problems, this application provides the following technical solutions:
[0004] In order to solve the technical problems existing in the current commercial high-precision absolute encoders used in such instruments, the present invention proposes a high-precision angle measuring device. Through this device, high-precision angle measurement of 0.001° is fully realized, and it has the characteristics of small size, which perfectly solves the shortcomings of these instruments and achieves high precision and low cost.
[0005] A high-precision angle measuring device, comprising a light source, a sector optical code disk and a linear array sensor arranged in sequence above and below;
[0006] A code disc support is provided inside the sector-shaped optical code disc;
[0007] At least two groups of rotating shafts are provided on the inner side of the code disc bracket and a friction shaft is provided on the outer side. The rotating shafts are tangent to the inner side of the code disc bracket and the friction shafts are tangent to the outer side of the code disc bracket.
[0008] Preferably, the light source is an LED light source.
[0009] Preferably, the rotating shaft is a miniature bearing.
[0010] Preferably, it includes a spring, one end of which is fixed to the friction shaft, and the other end is fixed to the inner side of the code disc bracket.
[0011] Preferably, the friction shaft is connected to the rotating structure of the instrument for installing the angle measuring device through a coupling.
[0012] An angle measuring instrument is equipped with a high-precision angle measuring device as described in any one of the above items.
[0013] Preferably, the angle measuring instrument is any one of an automatic polarimeter or an automatic refractometer.
[0014] Compared with the prior art, the beneficial effects achieved by this application are:
[0015] 1. This structure uses a sector-shaped optical code disk. Compared with a circular optical code disk, the angle encoder with the same accuracy can save space and realize the miniaturization of the angle encoder.
[0016] 2. This structure uses a sector-shaped optical code disk. Compared with a circular optical code disk, the radius of the sector-shaped code disk can be very large, which improves the engraving accuracy of the code disk and achieves higher accuracy of the angle encoder.
[0017] 3. This structure adopts the three-point tangent principle to realize the angle-encoded virtual axis (eliminating the need for a real axis for a circular optical code disk), which can be located outside the instrument and can theoretically be infinite. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings:
[0019] Figure 1 This is the structural principle diagram of a commercial encoder;
[0020] Figure 2 This is a schematic diagram of the structure of the angle measuring device of the present application;
[0021] Figure 3 It is a three-dimensional diagram of the angle measuring device of the present application;
[0022] In the figure: LED light source 1, optical code disk 2, linear array sensor 3, precision rotating shaft 4, code disk bracket 5, friction shaft 6, spring 7, miniature bearing 8, spring fixing hole 9. DETAILED DESCRIPTION
[0023] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0024] In the description of this application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.
[0025] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0026] like Figures 1 to 3 As shown,
[0027] Figure 1 It is a prior art encoder.
[0028] Figure 2 and Figure 3 This is a high-precision angle measurement device of the present application. The light emitted by light source 1 (white LED lamp) is directly projected onto the optical code disk. The barcode image on the optical code disk is directly projected onto the linear array sensor. The collected barcode digital image is sent to the microprocessor for decoding to obtain the angle value.
[0029] The code disc bracket is internally tangent to the two miniature bearings, while the friction shaft is externally tangent to the code disc bracket via a spring preload. The other end of the spring is fixed to the spring mounting hole. The spring force is required to ensure comfortable and smooth rotation of the code disc bracket. The friction shaft can be connected to the rotating structure of the angle measurement instrument via a coupling to measure the instrument's angle. (Because the code disc is absolutely encoded, the friction shaft and code disc bracket rotate asynchronously, acting only as a rotary encoder. The spring mounting hole is actually located on the instrument used for the angle measurement device.)
[0030] It should be noted that, in this document, relational terms such as first and second, etc., are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or device. Finally, it should be noted that the above are only preferred embodiments of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.
Claims
1. A high-precision angle measuring device, characterized in that: It includes a light source, a sector optical code disk and a linear array sensor which are arranged in sequence up and down; A code disc support is provided inside the sector-shaped optical code disc; At least two groups of rotating shafts are provided on the inner side of the code disc bracket and a friction shaft is provided on the outer side. The rotating shaft is tangent to the inner side of the code disc bracket and the friction shaft is tangent to the outer side of the code disc bracket.
2. A high-precision angle measuring device according to claim 1, characterized in that: The light source is an LED light source.
3. A high-precision angle measuring device according to claim 1, characterized in that: The rotating shaft is a miniature bearing.
4. A high-precision angle measuring device according to claim 1, characterized in that: It includes a spring, one end of which is fixed to the friction shaft, and the other end is fixed to the inner side of the code disc bracket.
5. The high-precision angle measuring device according to claim 1, characterized in that: The friction shaft is connected to the rotating structure of the instrument for installing the angle measuring device through a coupling.
6. An angle measuring instrument, characterized in that: Install a high-precision angle measuring device as described in any one of claims 1 to 5.
7. An angle measuring instrument according to claim 1, characterized in that: The angle measuring instrument is any one of an automatic polarimeter and an automatic refractometer.