Reflection-type incremental encoder and rotation position detection device

Abstract

The utility model relates to the field of micro-control systems, and provides a reflective incremental encoder and a rotation position detection device. The reflective incremental encoder comprises a substrate, a transmitting device, a receiving device and a coating colloid, the transmitting device and the receiving device are arranged on the upper surface of the substrate at a preset interval, the transmitting device and the receiving device are isolated through a light isolation groove, and the coating colloid is arranged on the upper surface of the substrate and packages the transmitting device and the receiving device in a coating mode. The emitting device emits near-infrared light signals and emits the near-infrared light signals in the direction away from the substrate through the coating colloid. The receiving device is used for receiving photoelectric signals in the direction towards the substrate through the coating colloid. According to the utility model, the integrated design realizes miniaturization, and on the premise of improving the protection performance of the encoder, the optical isolation is improved to enhance the stability.

Description

Technical Field

[0001] This utility model belongs to the field of microcontroller technology, and in particular relates to a reflective incremental encoder and a rotary position detection device. Background Technology

[0002] Existing rotary position detection technologies mainly include mechanical encoders, magnetic encoders, and photoelectric encoders. Mechanical encoders detect rotary position through mechanical contact, offering advantages such as simple structure and low cost, but suffer from mechanical wear, short lifespan, and limited accuracy. Magnetic encoders detect rotary position using changes in magnetic fields, avoiding mechanical contact, but are susceptible to external magnetic field interference and exhibit poor stability in complex electromagnetic environments. Traditional photoelectric encoders typically employ a transmissive structure, requiring transmitters and receivers to be mounted on opposite sides of the rotating shaft. This structure demands significant installation space and high machining precision. While existing reflective photoelectric encoders have solved the space limitations of transmissive structures, most employ discrete component assembly, with transmitters and receivers separately packaged. This results in a large overall size, complex installation, and difficulty in guaranteeing the relative positional accuracy between components, impacting detection accuracy and stability.

[0003] Existing discrete reflective encoders are bulky and unsuitable for the integration requirements of miniaturized devices; large assembly errors between components make optical axis alignment difficult and detection accuracy unstable; multiple discrete components increase system complexity and failure rate; traditional packaging processes cannot achieve ultra-thin designs, limiting applications in space-constrained environments; existing products have poor optical isolation, easily generating optical crosstalk and affecting signal quality; and the manufacturing process is complex, inconsistent, and has high mass production costs. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a reflective incremental encoder and a rotary position detection device.

[0005] This utility model provides a reflective incremental encoder, comprising:

[0006] Substrate, transmitting device, receiving device, coating colloid;

[0007] The substrate has an upper surface and a lower surface. The transmitting device and the receiving device are arranged at a predetermined distance on the upper surface of the substrate. The transmitting device and the receiving device are isolated by a light isolation groove. The encapsulating colloid is disposed on the upper surface of the substrate to encapsulate the transmitting device and the receiving device. The transmitting device emits near-infrared light signals and emits them away from the substrate through the encapsulating colloid. The receiving device is used to receive photoelectric signals toward the substrate through the encapsulating colloid.

[0008] According to the present invention, a reflective incremental encoder is provided, wherein the transmitting device is an infrared point light source emitting tube, the infrared point light source emitting tube includes an LED chip and an optical lens, and the optical lens focuses the near-infrared light signal emitted by the LED chip.

[0009] According to the present invention, a reflective incremental encoder is provided, the receiving device comprising:

[0010] Multiple first photoelectric signal receivers and multiple second photoelectric signal receivers;

[0011] The number of the first photoelectric signal receiver and the second photoelectric signal receiver are equal and they are arranged alternately. Multiple first photoelectric signal receivers and multiple second photoelectric signal receivers are all disposed on the upper surface of the substrate and arranged at a predetermined distance from the infrared point light source emitting tube.

[0012] According to the present invention, a reflective incremental encoder is provided in which the first photoelectric signal receiver outputs a first phase signal, the second photoelectric signal receiver outputs a second phase signal, and there is a 90-degree phase difference between the first phase signal and the second phase signal.

[0013] According to the reflective incremental encoder provided by this utility model, it further includes:

[0014] Copper foil circuit board;

[0015] The copper foil circuit board is disposed on the lower surface of the substrate. The copper foil circuit board includes multiple solder leads, including a positive power supply lead, a negative power supply lead, a first signal output lead, and a second signal output lead.

[0016] According to the present invention, a reflective incremental encoder is provided, wherein the light isolation groove is disposed on the upper surface of the substrate and is arranged perpendicularly to the upper surface of the substrate.

[0017] According to the present invention, a reflective incremental encoder is provided, wherein the substrate is a double-sided copper-clad fiberglass board and the coating colloid is an epoxy resin colloid.

[0018] This utility model also provides a rotational position detection device based on a reflective incremental encoder, comprising:

[0019] Rotary code disk and reflective incremental encoder as described in any of the above;

[0020] The rotating code disk has surface stripes. The rotating code disk receives the near-infrared light signal emitted by the reflective incremental encoder, modulates and reflects the near-infrared light signal, and transmits it back to the reflective incremental encoder to output a digital signal for position detection of the device under test.

[0021] According to the present invention, a rotary position detection device based on a reflective incremental encoder is provided. The rotary code disk has a circular structure and a central shaft hole. The circumferential surface of the rotary code disk is provided with surface stripes, which include alternating reflective stripes and non-reflective stripes. The width of the reflective stripes is equal to the width of the non-reflective stripes.

[0022] According to the present invention, a rotary position detection device based on a reflective incremental encoder is provided, wherein the rotary code disk further includes a reference mark area, the center of which is set at the radial position of the rotary code disk for generating a zero-position reference signal.

[0023] This utility model provides a reflective incremental encoder and a rotary position detection device. It uses a substrate as a carrier to integrate an infrared point light source emitter, a first photoelectric signal receiver, and a second photoelectric signal receiver on the same substrate. This effectively solves the problem of poor assembly accuracy of traditional discrete components, ensures the relative position accuracy between the components, and thus significantly improves the stability and reliability of the detection. It also reduces signal drift and errors caused by component position deviations, enabling the entire detection system to maintain high-precision measurement performance over a long period of time. It is particularly suitable for industrial automation and precision measurement applications with strict accuracy requirements.

[0024] This invention effectively prevents direct crosstalk of emitted light signals by forming light isolation slots between the infrared point light source emitter and the first photoelectric signal receiver, as well as between the infrared point light source emitter and the second photoelectric signal receiver. This significantly improves the signal-to-noise ratio and eliminates the optical crosstalk problem commonly found in traditional designs. This allows the receiver to accurately identify reflected signals from the rotating code disk, avoiding false triggering and signal distortion. As a result, it ensures the accuracy of the detection results and the stability of the system, significantly reducing the system failure rate and maintenance costs.

[0025] This invention uses an ultra-thin epoxy resin colloid with a thickness of only 0.65mm for overall encapsulation, which not only effectively protects the device from damage to internal precision components caused by external dust, moisture, and mechanical impact, thus extending the product's service life, but more importantly, it achieves miniaturization, enabling the entire device to be integrated into equipment with extremely limited space. This provides the possibility for the compact design of modern electronic devices. At the same time, the ultra-thin encapsulation also reduces the weight of the product, reduces the load requirements on the installation structure, and simplifies the complexity of mechanical design.

[0026] The first and second photoelectric signal receivers in this invention output VccA and VccB signals with a 90-degree phase difference, providing a reliable data foundation for rotation direction determination and precise position calculation. Compared with the single-channel detection scheme, the dual-channel phase difference detection can not only accurately determine the rotation direction, but also improve the resolution by four times through the quadruple frequency multiplication technology, which greatly improves the accuracy of position detection and meets the strict requirements of high-precision servo control and precision positioning systems. At the same time, the dual-channel design also provides signal redundancy, improving the system's fault tolerance and reliability.

[0027] In addition, the copper foil circuit board in this invention is set on the lower surface of the substrate and includes multiple solder leads, realizing a standardized surface mount technology interface. This allows the product to be mass-produced and assembled directly through SMT processes, which not only significantly reduces production costs and improves production efficiency, but also ensures product consistency and reliability. At the same time, the standardized surface mount packaging form allows the product to be easily integrated into various PCB designs, providing system integrators with great design flexibility and reducing the workload and cost of secondary development. Attached Figure Description

[0028] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same components. Obviously, the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings.

[0029] Figure 1 A top view of a reflective incremental encoder provided by this utility model;

[0030] Figure 2 A left view of a reflective incremental encoder provided by this utility model;

[0031] Figure 3 A three-dimensional view of a reflective incremental encoder provided by this utility model;

[0032] Figure 4 This invention provides a schematic diagram of the rotating code disk structure in a rotating position detection device based on a reflective incremental encoder.

[0033] Figure label:

[0034] 100, substrate; 200, transmitting device; 300, receiving device; 400, light-isolating groove; 500, coating colloid; 600, rotating code disk.

[0035] 210. Infrared point light source emitting tube;

[0036] 310. First photoelectric signal receiver; 320. Second photoelectric signal receiver;

[0037] 610, Central shaft hole; 620, Reflective stripe; 630, Non-reflective stripe; 640, Reference mark area. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solutions in the embodiments of this utility model, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0039] Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts disclosed in this utility model.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "installed," "connected," and "joined" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0041] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of methods and systems consistent with some aspects of this invention as detailed in the appended claims.

[0042] The embodiments of this utility model are described below with reference to the accompanying drawings.

[0043] like Figures 1 to 4 As shown, this utility model provides a reflective incremental encoder, comprising:

[0044] Substrate 100, transmitting device 200, receiving device 300, coating colloid 500;

[0045] The substrate 100 has an upper surface and a lower surface. The transmitting device 200 and the receiving device 300 are arranged at a predetermined distance on the upper surface of the substrate 100. The transmitting device 200 and the receiving device 300 are isolated by a light isolation groove 400. The encapsulating colloid 500 is disposed on the upper surface of the substrate 100 to encapsulate the transmitting device 200 and the receiving device 300. The transmitting device 200 emits near-infrared light signals and emits them in a direction away from the substrate 100 through the encapsulating colloid 500. The receiving device 300 is used to receive photoelectric signals toward the substrate 100 through the encapsulating colloid 500.

[0046] The reflective incremental encoder of this invention adopts a highly integrated innovative design, organically integrating all key components on a single substrate carrier to form a compact and efficient photoelectric detection system.

[0047] Specifically, in this invention, the substrate 100 serves as the structural foundation and electrical carrier of the entire encoder. Its upper surface supports all the photoelectric devices, while the lower surface is reserved for the installation of electrical connection interfaces. The transmitting device 200 and the receiving device 300, as the core photoelectric devices of the encoder, are arranged on the upper surface of the substrate 100, maintaining a preset distance between them. This distance ensures that the transmitted light signal effectively covers the photosensitive area of ​​the receiver while avoiding unnecessary optical interference due to excessive proximity. Simultaneously, it considers the miniaturization requirements of the overall device and the feasibility of the manufacturing process.

[0048] Furthermore, regarding the physical connection of the components, all components are firmly soldered onto the substrate using surface mount technology (SMT), providing not only reliable mechanical fixation but, more importantly, establishing a stable electrical connection path. The multi-layered conductive lines within the substrate organically connect the various components, forming a complete circuit system. The transmitting device 200 receives power supply and control signals through its built-in circuitry, while the receiving device 300 transmits the detected photoelectric signals to the output port through the same circuitry. This integrated connection method completely eliminates the drawbacks of traditional discrete components requiring numerous external connections, significantly improving the system's reliability and consistency.

[0049] The signal transmission relationship is a complete photoelectric conversion cycle. After receiving power, the internal LED chip of the transmitting device 200 begins to emit stable near-infrared light signals. These light signals first penetrate the coating colloid 500 and then are emitted in a direction away from the substrate 100, forming a directional beam. When the encoder is working, the near-infrared light signals will illuminate the outside, and the reflected light signals, carrying the code disk position information, will penetrate the coating colloid 500 again and finally be captured by the receiving device 300. The receiving device 300 converts the received light signals into corresponding electrical signals. These electrical signals are transmitted to the output port through the conductive lines inside the substrate, forming digital signals that can be processed by subsequent circuits.

[0050] The coating colloid 500 is an epoxy resin colloid with a thickness of 0.65mm. Firstly, from a protective perspective, the coating colloid 500 provides physical protection for the internal precision optoelectronic components, effectively preventing damage from external dust, moisture, chemical corrosives, and mechanical impacts, significantly extending the product's lifespan and improving its reliability in harsh environments. Secondly, from an optical perspective, as a medium for optical signal transmission, the material properties and thickness design of the coating colloid 500 ensure that near-infrared light signals can penetrate the colloid with minimal loss. Simultaneously, the uniformity of the colloid contributes to maintaining beam collimation and focusing effects. It is important to emphasize that the design of the coating colloid 500 in this invention achieves the miniaturization goal of the entire encoder, laying the foundation for the final product to meet the space requirements of electronic devices.

[0051] In general, this invention achieves several advantages. Firstly, by integrating all components onto a single substrate using a unified manufacturing process, the relative positional accuracy between components is unprecedentedly guaranteed. This eliminates unavoidable positional errors inherent in traditional discrete component assembly, resulting in more precise optical axis alignment and significantly improved detection accuracy. Secondly, regarding reliability improvements, the integrated design reduces the number of connection points, lowering the risk of failure. Simultaneously, the protective effect of the encapsulating colloid and the anti-interference design of the light-isolating groove enhance the system's environmental adaptability and long-term stability, significantly reducing maintenance costs and failure rates. Thirdly, in terms of miniaturization, ultra-thin packaging technology keeps the encoder's thickness extremely low, providing an ideal solution for space-constrained applications while reducing product weight and simplifying mechanical mounting design requirements. Fourthly, in terms of manufacturing efficiency, the standardized SMT packaging allows the product to be fully integrated into modern automated production processes, achieving high efficiency and consistency in mass production and significantly reducing production costs. Finally, regarding application flexibility, this integrated design allows the encoder to be easily integrated into various systems, providing system integrators with significant design freedom, reducing the workload and technical risks of secondary development, and accelerating the marketization of the final product.

[0052] The emitting device 200 is an infrared point light source emitting tube 210, which includes an LED chip and an optical lens. The optical lens focuses the near-infrared light signal emitted by the LED chip.

[0053] Furthermore, the emitting device 200 employs an infrared point light source emitting tube 210, which integrates an LED chip to emit near-infrared light signals of a specific wavelength, operating in the 850nm or 940nm band. This operating band avoids interference from visible light while possessing excellent photoelectric conversion efficiency and penetration capability. The miniaturized design of the LED chip enables it to generate a highly concentrated point light source. The infrared point light source emitting tube 210 also integrates a precision optical lens system designed to effectively focus the near-infrared light signal emitted by the LED chip. The optical lens collects and reshapes the originally divergent light signal into a beam with higher collimation, improving the efficiency of light energy utilization and transmission distance. The focused light signal has better directionality and higher energy density, not only increasing the effective detection distance but also enhancing the system's resistance to external light interference. The integrated emitting device avoids the complexity of requiring external optical components in traditional solutions, achieving a more compact overall structure.

[0054] The receiving device 300 includes:

[0055] Multiple first photoelectric signal receivers 310 and multiple second photoelectric signal receivers 320;

[0056] The number of first photoelectric signal receivers 310 and second photoelectric signal receivers 320 is equal and they are arranged alternately. Multiple first photoelectric signal receivers 310 and multiple second photoelectric signal receivers 320 are all disposed on the upper surface of the substrate 100 and arranged at a predetermined distance from the infrared point light source emitting tube 210.

[0057] Furthermore, the receiving device 300 adopts an innovative dual-channel detection architecture, including multiple first photoelectric signal receivers 310 and multiple second photoelectric signal receivers 320. This invention achieves phase difference detection through the aforementioned spatially distributed differential reception, thereby obtaining richer position information.

[0058] like Figure 3As shown, the two types of receivers are kept in equal numbers, ensuring the balance and stability of the system output signal and avoiding signal amplitude differences caused by a mismatch in the number of receivers. The receivers are arranged in an alternating manner, that is, the first photoelectric signal receiver 310 and the second photoelectric signal receiver 320 are arranged in a regular interval in space. The spatial geometric relationship is such that when the stripe pattern on the rotating code disk passes by, the two sets of receivers will receive changes in the reflected light signal at different time points, thereby generating a phase difference in the time dimension. All receivers are mounted on the upper surface of the substrate 100, maintaining a preset distance from the infrared point light source emitting tube 210 to meet the requirements of beam divergence angle, receiver photosensitive area, and system detection accuracy, ensuring that each receiver can receive a reflected light signal of sufficient intensity.

[0059] The first photoelectric signal receiver 310 outputs a first phase signal, and the second photoelectric signal receiver 320 outputs a second phase signal. There is a 90-degree phase difference between the first phase signal and the second phase signal.

[0060] Furthermore, the 90-degree phase difference is achieved by controlling the spatial position of the receivers. Specifically, the spatial distance between the two sets of receivers is designed to be one-quarter of the code disk stripe period. When the code disk rotates, the intensity change of the reflected light signal is captured by the receiver in the form of a sine wave. Due to the difference in spatial position, the signal received by the second set of receivers will have a one-quarter period delay relative to the first set of receivers, which is manifested as a 90-degree phase difference in the signal waveform.

[0061] The established 90-degree phase difference provides a reliable basis for determining the rotation direction. Based on the phase difference, the clockwise or counterclockwise rotation direction of the encoder can be accurately determined by analyzing the phase lead-lag relationship between the two signals. Secondly, the 90-degree phase difference enables the system to achieve quadruple frequency processing, that is, four effective counting pulses can be generated within one encoder stripe cycle, which significantly improves the resolution of position detection. In addition, the dual-channel signal also provides the ability to monitor signal quality. By comparing the amplitude and phase relationship of the two channel signals, system faults or performance degradation can be detected in a timely manner.

[0062] This also includes:

[0063] Copper foil circuit board;

[0064] The copper foil circuit board is disposed on the lower surface of the substrate 100. The copper foil circuit board includes a plurality of soldering leads, including a positive power supply lead, a negative power supply lead, a first signal output lead, and a second signal output lead.

[0065] Furthermore, the copper foil circuit board, serving as the electrical interface carrier for the entire encoder system, is placed on the lower surface of the substrate 100, forming a layered functional division architecture. This functional division architecture effectively separates the photoelectric functional area and the electrical interface area, avoiding mutual interference, and also facilitates the implementation of manufacturing processes and product standardization.

[0066] The light isolation groove 400 is disposed on the upper surface of the substrate 100 and is perpendicular to the upper surface of the substrate 100.

[0067] Furthermore, the light-isolating groove 400 is located between the transmitting device 200 and the receiving device 300, and is vertically disposed on the upper surface of the substrate 100. From a physical structure perspective, the light-isolating groove 400 of this invention aims to form a physical barrier to block the near-infrared light signal generated by the transmitting device 200 from directly propagating to the receiving device 300. The purpose is to prevent optical crosstalk. That is, without the isolation groove, the light signal emitted by the transmitting device may directly reach the receiving device through multiple paths, including propagation through air, reflection from the substrate surface, or scattering within the encapsulated colloid. These direct light signals will mix with the useful reflected signal from the code disk, causing signal distortion and detection errors. The presence of the light-isolating groove 400 of this invention ensures that the receiving device 300 can only receive the useful light signal reflected from the external code disk, significantly improving signal purity and signal-to-noise ratio.

[0068] The substrate 100 is a double-sided copper-clad fiberglass board, and the coating colloid 500 is an epoxy resin colloid.

[0069] Furthermore, the aforementioned substrate is a BT substrate, which is a high-performance double-sided copper-clad fiberglass board. The core structure of the BT substrate consists of three main layers: the innermost layer is fiberglass woven fabric as a reinforcing skeleton, the middle layer is BT resin as a matrix material, and the outermost layer is precision electrolytic copper foil as a conductive layer.

[0070] In addition, since reflective incremental encoders need to work stably for a long time in various industrial environments, they face multiple threats such as dust, moisture, chemical corrosion, and mechanical shock. Therefore, this invention uses epoxy resin colloid to achieve the protective function. The protective layer formed after the epoxy resin colloid is cured has excellent sealing performance and can effectively block the intrusion of external pollutants. Its chemical inertness ensures stability in acidic, alkaline or organic solvent environments, while its good mechanical strength provides protection against impact and vibration.

[0071] Secondly, epoxy resin colloids not only need to protect internal components, but also need to ensure the effective transmission of optical signals. Through precise control of the material formulation, the refractive index of the colloid can be controlled, thereby optimizing the propagation characteristics of the light beam, reducing light reflection loss at the interface, and improving the light energy utilization efficiency. At the same time, the uniformity of epoxy resin ensures that the light beam will not produce significant scattering or distortion during propagation, maintaining the quality of the optical signal.

[0072] Regarding process compatibility, the curing process of epoxy resin colloid can be completed at a relatively low temperature, which is compatible with the temperature requirements of SMT process and will not cause thermal damage to the already mounted devices. Its good fluidity ensures that it can completely fill the gaps between devices during the encapsulation process and avoid the generation of air bubbles. The cured colloid also has good adhesive strength and can form a firm bond with the BT substrate, ensuring reliability in long-term use.

[0073] Regarding the size of the epoxy resin colloid, the epoxy resin colloid is small and thin, thus maximizing the transmission and reception efficiency of photoelectric signals. The width of the epoxy colloid is 3.3mm to 3.0mm, the thickness is 0.65mm, and the length can be cut according to the actual product size. It should be noted that any finished product size, such as 2.0*2.0*1.1mm or 7.6*5.4*1.1mm, is within the protection scope of this utility model.

[0074] In one specific embodiment, the epoxy resin colloid in this invention is designed as an ultra-thin structure of 0.65mm. The low shrinkage rate of epoxy resin ensures dimensional stability during the curing process, while its good mechanical strength ensures the integrity of the ultra-thin structure. This not only achieves the goal of product miniaturization but also reduces the propagation loss of light signals in the colloid and improves the optical efficiency of the system.

[0075] This utility model also provides a rotational position detection device based on a reflective incremental encoder, comprising:

[0076] Rotary code disk 600 and reflective incremental encoder as described in any of the above;

[0077] The rotary code disk 600 has surface stripes on its surface. The rotary code disk 600 receives the near-infrared light signal emitted by the reflective incremental encoder, modulates and reflects the near-infrared light signal, and transmits it back to the reflective incremental encoder to output a digital signal for position detection of the device under test.

[0078] The rotary position detection device based on a reflective incremental encoder provided by this utility model has the reflective incremental encoder fixedly installed on the equipment frame during operation. It does not rotate with the shaft and faces the surface of the rotating code disk with the transmitting and receiving surfaces facing each other. The rotating code disk is coaxially installed on the rotating shaft of the device under test through the central shaft hole 610, rotates synchronously with the shaft under test, and maintains an appropriate working distance from the encoder.

[0079] The rotating code disk 600 has a circular structure and a central shaft hole 610. The circumferential surface of the rotating code disk 600 is provided with surface stripes, which include alternating reflective stripes 620 and non-reflective stripes 630. The width of the reflective stripes 620 is equal to the width of the non-reflective stripes 630.

[0080] The rotary code disk 600 further includes a reference mark area 640, the center of which is located at a radial position of the rotary code disk 600, for generating a zero-position reference signal.

[0081] The rotary position detection device based on a reflective incremental encoder provided by this utility model first emits a near-infrared beam through an infrared point light source emitting tube 210. The beam is emitted upward through a coating colloid 500 and illuminates the surface stripes of the rotating code disk 600. The reflective stripes 620 reflect most of the light signal back to the encoder, while the non-reflective stripes 630 are made of low reflectivity material, absorb the light signal, and have almost no reflection. When the code disk rotates, the reflective and non-reflective stripes alternately pass through the area illuminated by the beam, forming a modulated light signal with alternating brightness and darkness. The modulated reflected light is received by the receiving device 300 through the coating colloid 500. The first photoelectric signal receiver 310 and the second photoelectric signal receiver 320 are arranged alternately. Due to the difference in spatial position, the two sets of receivers receive signals with a 90-degree phase difference.

[0082] This invention provides a reflective incremental encoder and a rotational position detection device based on the reflective incremental encoder, which can be applied to semiconductor devices (including LEDs and photoelectric receiving semiconductors). Solder paste is used to solder the leads to achieve electrical connection between the external PCB circuit board and the device. Under constant current drive, the LED chip generates photons, and the receiving component receives the light from the reflective crystal to confirm the rotational direction and speed on the code disk. Based on the encoder of this invention, a surface-mount packaged product with a reflective incremental encoder can be manufactured for applications in intelligent sensing, microcontroller systems, distance detection, and medical detection.

[0083] This invention optimizes the traditional sensor structure, reducing its size and volume while improving sensing accuracy and density. It eliminates the need for physical contact and converts the reflected light signal onto the stripe output port of the rotating code disk into a comparable level signal, thus achieving a superior detection system.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, and not to limit it. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A reflective incremental encoder, characterized in that, include: Substrate, transmitting device, receiving device, coating colloid; The substrate has an upper surface and a lower surface. The transmitting device and the receiving device are arranged at a predetermined distance on the upper surface of the substrate. The transmitting device and the receiving device are isolated by a light isolation groove. The encapsulating colloid is disposed on the upper surface of the substrate to encapsulate the transmitting device and the receiving device. The transmitting device emits near-infrared light signals and emits them away from the substrate through the encapsulating colloid. The receiving device is used to receive photoelectric signals toward the substrate through the encapsulating colloid.

2. A reflective incremental encoder according to claim 1, characterized in that, The emitting device is an infrared point light source emitting tube, which includes an LED chip and an optical lens. The optical lens focuses the near-infrared light signal emitted by the LED chip.

3. A reflective incremental encoder according to claim 2, characterized in that, The receiving device includes: Multiple first photoelectric signal receivers and multiple second photoelectric signal receivers; The number of the first photoelectric signal receiver and the second photoelectric signal receiver are equal and they are arranged alternately. Multiple first photoelectric signal receivers and multiple second photoelectric signal receivers are all disposed on the upper surface of the substrate and arranged at a predetermined distance from the infrared point light source emitting tube.

4. A reflective incremental encoder according to claim 3, characterized in that, The first photoelectric signal receiver outputs a first phase signal, and the second photoelectric signal receiver outputs a second phase signal. There is a 90-degree phase difference between the first phase signal and the second phase signal.

5. A reflective incremental encoder according to claim 1, characterized in that, Also includes: Copper foil circuit board; The copper foil circuit board is disposed on the lower surface of the substrate. The copper foil circuit board includes multiple solder leads, including a positive power supply lead, a negative power supply lead, a first signal output lead, and a second signal output lead.

6. A reflective incremental encoder according to claim 1, characterized in that, The light-isolating groove is disposed on the upper surface of the substrate and is perpendicular to the upper surface of the substrate.

7. A reflective incremental encoder according to claim 1, characterized in that, The substrate is a double-sided copper-clad fiberglass board, and the coating colloid is an epoxy resin colloid.

8. A rotary position detection device based on a reflective incremental encoder, characterized in that, include: A rotary code disk and a reflective incremental encoder as described in any one of claims 1 to 7; The rotating code disk has surface stripes. The rotating code disk receives the near-infrared light signal emitted by the reflective incremental encoder, modulates and reflects the near-infrared light signal, and transmits it back to the reflective incremental encoder to output a digital signal for position detection of the device under test.

9. A rotary position detection device based on a reflective incremental encoder according to claim 8, characterized in that, The rotating code disk has a circular structure and a central shaft hole. The circumferential surface of the rotating code disk is provided with surface stripes, which include alternating reflective and non-reflective stripes. The width of the reflective stripes is equal to the width of the non-reflective stripes.

10. A rotary position detection device based on a reflective incremental encoder according to claim 8, characterized in that, The rotary code disk also includes a reference mark area, the center of which is located at a radial position on the rotary code disk, for generating a zero-position reference signal.

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