Optical encoder

Abstract

The utility model discloses an optical encoder, which belongs to the technical field of optical encoders and comprises a buckle cover, a circuit board and a shell, the buckle cover is mounted on the circuit board, and the circuit board is coaxially mounted on the shell. According to the utility model, the circuit board is provided with the first through hole, and the first through hole is provided with the buckle cover, thereby not only achieving the installation visualization of the optical encoder and the motor shaft, but also simplifying the installation steps of the optical encoder. Besides, simple sealing processing is carried out between the circuit board and the integrally-formed shell, so that the sealing performance of the optical encoder is guaranteed, and the risk that impurities permeate into a nested shell structure is avoided. Meanwhile, the height of the optical encoder is reduced, the size is reduced, and more applicable installation scenes are provided for the optical encoder.

Description

Technical Field

[0001] This utility model relates to the field of optical encoder technology, and in particular to optical encoders. Background Technology

[0002] Optical encoders are key components of motors, primarily used to detect the speed and displacement of mechanical parts and convert this information into a series of electrical signals, thereby achieving more precise and stable motion control. In practical applications, the motor's operating environment may be humid or dusty. If impurities penetrate the optical encoder, it will negatively impact its precision and accuracy. Furthermore, optical encoders also suffer from high installation requirements and cumbersome installation procedures.

[0003] In existing technologies, it is difficult to intuitively calibrate and align optical encoders when they are mounted on motor shafts, and the optical encoders are not well sealed, making them easy to be contaminated by lubricating oil, moisture or dust. Therefore, it is important to design and install optical encoders that are visually identifiable and have high sealing performance. Utility Model Content

[0004] This invention aims to overcome the problems of poor sealing and non-visual installation of encoders in the prior art, and provides an optical encoder.

[0005] To achieve the above objectives, the present invention provides an optical encoder, comprising a cover, a circuit board, and a housing. The cover is mounted on the circuit board, and the circuit board is coaxially mounted on the housing, forming a receiving space.

[0006] In one embodiment, a first through hole is formed at the center of the circuit board, the first through hole providing operating space for the connection between the motor shaft and the connecting shaft.

[0007] In one embodiment, at least one buckle is provided at the bottom of the cover, and the buckle passes through the first through hole and engages with the circuit board.

[0008] In one embodiment, the circuit board is provided with an output terminal for connecting to an external device.

[0009] In one embodiment, the housing includes a bottom plate, a side wall, and at least one of the fixing parts, the side wall being disposed on the bottom plate, and at least one of the fixing parts being disposed on the side wall.

[0010] In one embodiment, the circuit board is axially mounted on the fixing part.

[0011] In one embodiment, the housing further includes a first mounting groove and a first protrusion, the first protrusion being disposed on the base plate, the first mounting groove being formed on the side wall, and the first mounting groove being connected to the first protrusion.

[0012] In one embodiment, the housing further includes a second protrusion and a second through hole, the second through hole being formed at the center of the base plate, the second protrusion being disposed on the lower end surface of the base plate, and the second protrusion being connected to the through hole.

[0013] In one embodiment, the optical encoder further includes a code disk, a dual bearing assembly, and a connecting shaft. The code disk is fixedly mounted on the connecting shaft, and the dual bearing assembly is coaxially nested on the connecting shaft. The dual bearing assembly includes a first bearing and a second bearing. The first bearing is mounted in a second through hole of the housing, and the second bearing is mounted in a second protrusion of the housing.

[0014] In one embodiment, the optical encoder further includes a lamp holder and a lamp source, the lamp source being installed in the lamp holder, the lamp holder being installed in a first mounting groove of the housing, and the arc-shaped protrusion at the top of the lamp holder engaging with the arc-shaped groove on the circuit board.

[0015] In summary, this utility model discloses an optical encoder. By opening the first through hole on the circuit board and setting the cover on the first through hole, not only is the installation of the optical encoder and the motor shaft visualized, but the installation steps of the optical encoder are also simplified. Furthermore, a simple sealing treatment is applied between the circuit board and the integrally formed housing to ensure the sealing performance of the optical encoder and avoid the risk of impurities seeping into the nested housing structure; at the same time, the height of the optical encoder is reduced, its volume is decreased, and more applicable installation scenarios are provided for the optical encoder.

[0016] To make the above-mentioned features and advantages of the utility model more apparent and understandable, specific embodiments are described below, and detailed descriptions are provided in conjunction with the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a perspective view of the optical encoder in this utility model.

[0018] Figure 2 for Figure 1 An exploded view of the optical encoder in the image.

[0019] Figure 3 for Figure 1 First-person perspective stereoscopic view of the middle shell.

[0020] Figure 4 for Figure 1 A second-view perspective stereoscopic view of the middle shell. Detailed Implementation

[0021] To make the objectives and technical solutions of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0022] Figure 1 The optical encoder provided by this utility model, such as Figure 1 The optical encoder shown is used for real-time monitoring of a motor. The encoder can be axially mounted at one end of the motor and fixedly connected to one end of the motor shaft. The optical encoder described in this invention includes, but is not limited to, incremental optical encoders and absolute optical encoders, and the motor can be a servo motor.

[0023] Figure 2 The optical encoder provided by this utility model Figure 2 for Figure 1 An exploded view. (For example...) Figure 2 As shown, the optical encoder includes a cover 1, a circuit board 2, a code disk 3, a double bearing assembly 4, a connecting shaft 5, a housing 6, a lamp source holder 7, a lamp source 8, and a mounting bracket 9. The cover 1 is mounted on the circuit board 2, and the circuit board 2 is concentrically mounted on the housing 6, forming a space for mounting other components (see...). Figure 2 The code disk 3, the double bearing assembly 4, and the connecting shaft 5 are installed inside the housing 6. The code disk 3 is fixedly installed on the connecting shaft 5. The double bearing assembly 4 is coaxially nested on the connecting shaft 5. The lamp source holder 7 is disposed on the side of the housing 6. The lamp source 8 is installed in the lamp source holder 7. The mounting bracket 9 is axially installed at the bottom of the housing 6.

[0024] At least one snap-fit ​​11 is provided at the bottom of the cover 1. The snap-fit ​​11 passes through the first through hole on the circuit board 2 and engages tightly with the circuit board 2 to form a preliminary seal, ensuring the stability of the internal working environment of the optical encoder. In addition, the cover 1 is fixedly connected to the circuit board 2 by snap-fit, which has the characteristics of convenient installation and good mechanical performance.

[0025] A first through hole 21 is formed in the center of the circuit board 2, and the buckle 11 passes through the first through hole 21 and engages with it. At least one arc-shaped groove 22 and at least one first screw hole 23 are also provided on the edge of the circuit board 2. The arc-shaped groove 22 is used to install the lamp source holder 7, and the first screw hole 23 is used to install screws to fix the circuit board 2 and the housing 6. Simultaneously, the circuit board 2 can also serve as a top cover, and an output end 24 is provided on the upper surface of the circuit board 2 for connecting to an external connector, avoiding the need for additional lead wire structures. This design optimizes the wiring method, avoiding the need for wire holes in the housing 6, which not only improves the sealing of the structure but also simplifies the wiring method, avoiding problems such as wire accumulation and excessive wire clearance during subsequent installation. Furthermore, the first through hole 21 provides operating space for subsequent fixed connection of the motor shaft and the connecting shaft 5, enabling a visible connection between the optical encoder and the motor shaft.

[0026] The track lines of the code disk 3 are aligned with the track lines of the photocells on the circuit board 2. The code disk 3 has a fixed encoding pattern, receives the light beam from the lamp source 8 and forms corresponding photoelectric signals on the code disk 3, thereby realizing the detection and control functions of the optical encoder.

[0027] The dual-bearing assembly 4 includes a first bearing 41 and a second bearing 42, which are axially nested on the connecting shaft 5 in sequence. Using the dual-bearing assembly 4 can distribute the load, reduce wear on individual bearings, thereby providing better support and durability; it can also maintain the operational stability of the optical encoder.

[0028] A threaded hole 51 is provided in the center of the connecting shaft 5, and the screw 52 is tightened at one end of the motor shaft through the threaded hole 51 to keep the connecting shaft 5 and the motor shaft fixed and to achieve the positioning of the connecting shaft 5 and the motor.

[0029] like Figure 3 As shown, the housing 6 includes a base plate 61, a side wall 62, a first mounting groove 63, a first protrusion 64, and a second protrusion 65 (see...). Figure 4 The sidewall 62 is disposed on the base plate 61, the second through hole 66 is formed at the center of the base plate 61, the first protrusion 64 is disposed on the base plate 61, the first mounting groove 63 is formed on the sidewall 62 and is connected to the first protrusion 64, the second protrusion 65 is disposed on the lower end face of the base plate 61 and is connected to the second through hole 66, and at least one of the fixing parts 67 is disposed on the inner side of the sidewall 62. Furthermore, a receiving space 68 is formed between the housing 6, the circuit board 2, and the cover 1 (see...). Figure 2The accommodating space 68 can be used to install other functional components. The housing 6 is integrally formed, the side wall 62 is a portion extending axially from the outer edge of the base plate 61, and the fixing part 67 is a portion extending radially from the side wall 62. A second screw hole 671 is provided on the fixing part 67, which corresponds to the first screw hole 23 and is fixed by screws. The first mounting groove 63 and the first protrusion 64 are provided for installing the lamp source holder 7, wherein at least one third screw hole 641 is provided on the first protrusion 64, which, when used with screws, can be used to fix the lamp source holder 7. Figure 4 It can be seen that the second protrusion 65 is a portion of the lower edge of the second through hole 66 extending axially. The second bearing 42 is installed in the second protrusion 65, and the first bearing 41 is installed in the second through hole 66.

[0030] Combination Figures 2 to 4 As can be seen, compared to the existing double-layer nested shell structure, the installation of the shell 6 is simpler, requiring only the alignment of the first screw hole 23 and the second screw hole 671. Furthermore, the shell 6 is integrally formed, eliminating gaps and preventing the infiltration of oil from inside the equipment, as well as water and dust from outside. The shell 6 can be cast from materials such as aluminum alloy. Simultaneously, eliminating the double-layer nested shell structure effectively reduces the height and volume of the optical encoder, providing more applicable installation scenarios.

[0031] The sidewall 71 of the lamp source holder 7 is installed within the first mounting groove 63, and the sidewall 71 matches the shape of the first mounting groove 63. The bottom 72 of the lamp source holder 7 has several fourth screw holes 73, which correspond to and are locked with screws to secure the lamp source holder 7. The top of the lamp source holder 7 has at least one arc-shaped protrusion 74, which is installed within the arc-shaped groove 22. The lamp source 8 is a common light-emitting element used to generate a light source to illuminate the code disk.

[0032] During assembly, the connecting shaft 5 and the code disk 3 are pre-fixed together, which can be done using glue or other methods. The dual bearing assembly 4 is coaxially fixed onto the connecting shaft 5, and the connecting shaft 5 is installed inside the housing 6. To prevent the dual bearing assembly 4 from shifting during operation, glue or other fixing methods are used to axially limit the dual bearing assembly 4.

[0033] The circuit board 2 is mounted on the housing, axially on the fixing part 67. A gap is left between the edge of the circuit board 2 and the side wall 62 of the housing 6 to facilitate subsequent calibration. The vision system inspection device is passed through the first mounting slot 63 and inserted into the housing 6. The trajectory line on the code disk 3 is aligned with the photocell trajectory line on the circuit board 2. After calibration, the second screw hole 671 is aligned with the first screw hole 23 and tightened with screws.

[0034] The initial installation is completed by installing the lamp source 8 and the lamp source holder 7 onto the housing 6. UV adhesive is applied to the connections between the lamp source holder 7 and the housing 6, as well as between the circuit board 2 and the housing 6, and sealed after irradiation. Other sealing methods can also be used; this sealing procedure is not unique.

[0035] The preliminarily assembled components are locked and fixed to the motor using the mounting bracket 9, while the motor shaft is axially connected to the connecting shaft 5 and tightened with screws. After final inspection, the cover 1 is fastened and sealed.

[0036] In summary, this utility model discloses an optical encoder. By opening the first through hole 21 on the circuit board 2 and setting the cover 1 on the first through hole 21, not only is the installation of the optical encoder and the motor shaft visualized, but the installation steps of the optical encoder are also simplified. Furthermore, a simple sealing treatment is applied between the circuit board 2 and the integrally formed housing 6, ensuring the sealing performance of the optical encoder and avoiding the risk of impurities seeping into the nested housing structure; at the same time, the height of the optical encoder is reduced, its volume is decreased, and more applicable installation scenarios are provided for the optical encoder.

[0037] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An optical encoder, characterized in that, The optical encoder includes a cover, a circuit board, and a housing. The cover is mounted on the circuit board, and the circuit board is coaxially mounted on the housing, forming a receiving space. A first through hole is formed in the center of the circuit board, providing operating space for the connection between the motor shaft and the connecting shaft. At least one buckle is provided at the bottom of the cover, and the buckle passes through the first through hole and engages with the circuit board. The optical encoder also includes a code disk, a dual bearing assembly, and a connecting shaft. The code disk is fixedly mounted on the connecting shaft, and the dual bearing assembly is coaxially nested on the connecting shaft. The dual bearing assembly includes a first bearing and a second bearing. The first bearing is installed in a second through hole in the housing, and the second bearing is installed in a second protrusion in the housing.

2. The optical encoder as described in claim 1, characterized in that, The circuit board is provided with an output terminal for connecting to external devices.

3. The optical encoder as described in claim 1, characterized in that, The housing includes a bottom plate, a side wall, and at least one fixing part. The side wall is disposed on the bottom plate, and at least one fixing part is disposed on the side wall.

4. The optical encoder as described in claim 3, characterized in that, The circuit board is axially mounted on the fixing part.

5. The optical encoder as described in claim 4, characterized in that, The housing also includes a first mounting groove and a first protrusion. The first protrusion is disposed on the base plate, and the first mounting groove is formed on the side wall. The first mounting groove is connected to the first protrusion.

6. The optical encoder as described in claim 5, characterized in that, The housing also includes a second protrusion and a second through hole. The second through hole is formed at the center of the base plate, and the second protrusion is disposed on the lower end surface of the base plate. The second protrusion is connected to the through hole.

7. The optical encoder as described in claim 1, characterized in that, The optical encoder also includes a lamp holder and a lamp source. The lamp source is installed in the lamp holder, and the lamp holder is installed in the first mounting groove of the housing. The arc-shaped protrusion on the top of the lamp holder fits into the arc-shaped groove on the circuit board.

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