Code disc and coding system
By designing the index area as the first and second areas in the code disk, the problem of uneven pulse width of the index signal is solved, and a more uniform index signal and greater gate control margin is achieved, avoiding the loss of indicators or double index problems.
Patent Information
- Application Number
- CN202411112833.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-01-11
- Filing Date
- 2024-08-14
- Publication Date
- 2025-07-11
AI Technical Summary
Under the influence of assembly and space tolerances, the index area of the existing code disk leads to uneven pulse width of the index signal, thereby reducing the control margin of the index signal, which may lead to the loss of the index or the problem of double index.
The index area of the design code disk includes the first area and the second area, the first area is close to the signal area, the second area is close to the center of the circle, and the width of the first area is smaller than the second area. Through this design, a more balanced index signal pulse is generated to increase the gate control margin.
The pulse of the index signal is achieved more uniformly, which improves the gate control margin of the index signal, and avoids the problem of missing indicators or double indicators.
Smart Images
Figure CN120293036A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a code disk and an encoding system, and particularly to a code disk and an encoding system having an index region that allows for a small variation in the width of an index pulse. Background Art
[0002] Existing code wheels typically include an index region that serves as a reference region for a complete rotation of the code wheel. However, assembly and spatial tolerances may affect the marking position of the index region and the pulse width of the index signal caused by the index region. In this case, the margin of index signal gating may be reduced, and insufficient margin may lead to problems such as index loss or double index. Summary of the Invention
[0003] An object of the present invention is to disclose a code disk that can generate an index signal with uniform pulses and improve the margin of index signal gating.
[0004] Another object of the present invention is to disclose an encoding system that can generate an index signal with uniform pulses and improve the margin of index signal gating.
[0005] An embodiment of the present invention discloses a code disk, including: a signal region for receiving light and generating a code signal according to the light; and an index region for generating an index signal according to the light, where the index signal represents a complete rotation of the code disk; where the index region includes a first region and a second region larger than the first region; and where the first region is closer to the signal region than the second region.
[0006] Another embodiment of the present invention discloses an encoding system including a code disk and a processing circuit. The code disk includes: a signal region for receiving light and generating a code signal according to the light; and an index region for generating an index signal according to the light, where the index signal represents a complete rotation of the code disk; where the index region includes a first region and a second region larger than the first region; and where the first region is closer to the signal region than the second region. The processing circuit is used to determine the rotation of the code disk according to the code signal and the index signal.
[0007] According to the foregoing embodiments, the index signal can have more balanced pulses, and the index gating margin can be increased accordingly. Brief Description of the Drawings
[0008] Figure 1 A schematic diagram of a code disk according to an embodiment of the present invention is shown.
[0009] Figure 2 A schematic diagram of an encoding system according to an embodiment of the present invention is shown.
[0010] Figure 3and Figure 4 A schematic diagram showing signals generated by a code disk according to different embodiments of the present invention.
[0011] Figure 5 A schematic diagram showing an index area and signal tracks according to an embodiment of the present invention.
[0012] Figure 6 and Figure 7 A schematic diagram showing index areas according to different embodiments of the present invention.
[0013] Figure 8 A schematic diagram showing light patterns generated by an existing index area and the index area of the present invention.
[0014] Among them, the reference numerals are explained as follows:
[0015] 100 Code disk
[0016] 101 Signal area
[0017] 103, 701, 703 Index areas
[0018] 105 Center of the circle
[0019] 200 Coding system
[0020] 201 Optical sensor
[0021] 203 Light source
[0022] 205 Processing circuit
[0023] CS code signal
[0024] IS, IS_a, IS_b, IS_c Index signals
[0025] QS_1 First orthogonal signal
[0026] QS_2 Second orthogonal signal
[0027] R_1 First area
[0028] R_2 Second area
[0029] ST_1, ST_2 Signal tracks
[0030] W_1 First width
[0031] W_2 Second width
[0032] S_S Short side
[0033] S_L Long side
[0034] LT_C Light pattern
[0035] LT_V light pattern Detailed implementation manners
[0036] The content of the present invention will be described below with multiple embodiments. Please also note that the "first", "second" and similar descriptions in the following descriptions are only used to define different elements, parameters, data, signals or steps, and are not used to limit their order. For example, the first device and the second device may be devices with the same structure but different.
[0037] Figure 1 The schematic diagram of a code disk according to an embodiment of the present invention is shown. As Figure 1 shown, the code disk 100 includes a signal area 101 and an index area 103. The signal area 101 is used to receive light and generate at least one code signal according to the light. The index area 103 is used to generate an index signal according to the light. In an embodiment, the signal area 101 and the index area 103 include a reflective material. The index signal represents a complete rotation of the code disk 100. In an embodiment, the signal area 101 includes signal tracks (only the signal tracks ST_1 and ST_2 are marked for illustration), which are used to generate code signals. In Figure 1 the embodiment, the signal area 101 is located on the outer radius of the code disk 100, and the index area 103 is located on the inner radius of the code disk 100. In other words, the code disk 100 includes a center 105, and the index area 103 is closer to the center 105 than the signal area 101.
[0038] Figure 2 The schematic diagram of an encoding system according to an embodiment of the present invention is shown. As Figure 2 shown, the encoding system 200 includes an optical sensor 201, a light source 203 and a processing circuit 205. The light source 203 is used to emit the above-mentioned light L, and the optical sensor 201 (for example, an image sensor or a photodetector) is used to receive the light reflected by the signal area 101 and the index area 103. The processing circuit 205 is used to judge the rotation status of the code disk 100 according to the code signal CS and the index signal IS.
[0039] In an embodiment, the signal tracks ST_1 and ST_2 are used to generate a first orthogonal signal (or called channel A signal) and a second orthogonal signal (or called channel B signal) as the code signal CS. In this case, the signal tracks ST_1 and ST_2 can be encoded with a 90-degree phase difference. In the application of direction sensing, as Figure 2 the controller of the processing circuit 205 can judge the moving direction based on the phase relationship between the first orthogonal signal and the second orthogonal signal. As Figure 3As shown, when the code disk 100 rotates in the clockwise direction, the first orthogonal signal QS_1 leads the second orthogonal signal QS_2. Conversely, when the code disk 100 rotates in the counterclockwise direction, the second orthogonal signal QS_2 leads the first orthogonal signal QS_1. The index signal IS generated by the index region 103 is generated once in each complete rotation of the code disk and can be used to locate a specific position within the 360° rotation range.
[0040] Figure 2 The illustrated encoding system 200 can operate in two modes, one is the gating mode and the other is the non-gating mode. Figure 4 A schematic diagram of the signals generated by the code disk according to an embodiment of the present invention is shown. In Figure 4 the embodiment, the index signal IS_a is gated by the product of the first orthogonal signal QS_1 and the second orthogonal signal QS_2 in the gating mode. In addition, the index signal IS_b is gated only by the first orthogonal signal QS_1 in the gating mode. Additionally, in Figure 4 the embodiment, the index signal IS_c is not gated in the non-gating mode. In short, the index signal is gated by at least one of the code signals by Figure 2 the processing circuit 205 in the gating mode and is not gated in the non-gating mode.
[0041] The index signal can have different gating phases. For example, if the index signal is gated by 360°, the index signal has a high logic level with the maximum width. Conversely, if the index signal is gated by 90°, the index signal has a high logic level with a smaller width. As described above, assembly and spatial tolerances may reduce the margin of the index signal gating, which means that the possible gating phases are limited. For example, the index signal cannot be gated by more than 340°, or problems such as missing indexes or double indexes may occur.
[0042] To provide a better margin for index signal gating, the design of the index region 103 is disclosed in the following embodiments. Figure 5 A schematic diagram of the index region and the signal tracks according to an embodiment of the present invention is shown. Specifically, Figure 5 is Figure 1 a partial enlarged view. In addition, Figure 6 is Figure 5 an enlarged view of the index region 103 in Figure 6 Please refer to Figure 5 while referring to
[0043] As Figure 6As shown, the index area 103 includes a first area R_1 and a second area R_2 that is larger than the first area R_1. The first area R_1 is closer to the signal area 101 than the second area R_2. That is to say, the first area R_1 is located in the outer radius of the code disk 100, and the second area R_2 is located in the inner radius of the code disk 100. That is to say, the code disk 100 includes a center (for example, Figure 1 the center 105 shown), and the second area R_2 is closer to the center 105 than the first area R_1.
[0044] Figure 6 The embodiment shown can also be expressed as: the first width W_1 of the first area R_1 is less than the second width W_2 of the second area R_2. Additionally, Figure 6 The embodiment shown can also be expressed as: the index area 103 is trapezoidal, having a short side S_S and a long side S_L opposite the short side S_S, where the short side S_S is closer to the signal area (signal tracks ST_1, ST_2) than the long side S_L. Figure 6 The embodiment shown can also be stated as: the code disk includes a center (for example Figure 1 the center 105 shown), where the width of the index area 103 gradually decreases along the direction from the signal area towards the center.
[0045] In addition to Figure 6 the shape shown, the index area can also be other shapes. Figure 7 The schematic diagrams of the index area according to different embodiments of the present invention are shown. As Figure 7 shown, in the index area 701, Figure 6 the short side S_S and the long side S_L of the index area 103 in Figure 6 are replaced by arcs. Additionally, in the index area 703, Figure 6 and Figure 7 the short side S_S and the long side S_L of the index area 103 in Figure 6 and Figure 7 are replaced by broken lines. It should also be understood that the index area can be any other shape that follows the rules described in the embodiments of Figure 6 and Figure 7 . Furthermore, Figure 6 and Figure 7 the parameters shown can be changed according to different requirements and designs. For example, in one embodiment, Figure 6 the side S_1 is inclined at 0.36°, and in another embodiment, it is inclined at 0.72°.
[0046] Figure 6 and Figure 7The indicated index area can reflect more light in the inner radius and less light in the outer radius. When the optical sensor 201 detects this design, this design can generate a reflected light pattern with almost the same width at the upper part (outer radius) and at the bottom (inner radius). In one embodiment, the larger reflection area at the inner radius makes the reflection pulse width of the index signal (e.g., the width of the high logic level of the index signal) more balanced. In other words, if the inner radius has a larger reflection area, the change in the pulse width of the index signal is smaller. In addition, since the change in the pulse width is reduced, the margin of the index signal gating can be increased.
[0047] Figure 8 A schematic diagram showing the light patterns generated by the existing index area and the index area of the present invention is shown. Specifically, the light pattern LT_C is generated by the existing index area, while the light pattern LT_V is generated by the index area disclosed in the present invention. As Figure 8 shown, the light pattern LT_C has a larger width at the upper part and a smaller width at the bottom. However, for the light pattern LT_V, the width at the upper part is the same or almost the same as the width at the bottom. In other words, the width of the first part of the light pattern generated by the part of the index area closer to the signal area, and the width of the second part of the light pattern generated by the part of the index area farther from the signal area are the same or almost the same. As described above, if the inner radius has a larger reflection area, the change in the pulse width of the index signal is smaller.
[0048] According to the foregoing embodiments, the index signal can have a more balanced pulse, and the index gating margin can be increased accordingly.
[0049] The foregoing is only the preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A code disk, characterized in that, Comprising: A signal area for receiving light and for generating a code signal based on the light; And An index area for generating an index signal based on the light, wherein the index signal represents a complete rotation of the code disk; Wherein the index area includes a first area and a second area larger than the first area; Wherein the first area is closer to the signal area than the second area.
2. The code disc according to claim 1, characterized in that, The first area has a first width and the second area has a second width, and the first width is less than the second width.
3. The code disc according to claim 1, characterized in that, The index area is trapezoidal, the trapezoid having a short side and a long side opposite the short side, wherein the short side is closer to the signal area than the long side.
4. The code disk according to claim 1, characterized in that, The code disk includes a center, and the second area is closer to the center than the first area.
5. The code disc according to claim 1, characterized in that The code disk includes a center, and the width of the index area gradually decreases along the direction from the signal area to the center.
6. The code disk according to claim 1, wherein The signal area includes a signal track for generating the code signal.
7. The code disk according to claim 6, wherein The signal track is for generating a first orthogonal signal and a second orthogonal signal as the code signal.
8. The code disc according to claim 1, wherein The code disk includes a center, and the index area is closer to the center than the signal area.
9. A coding system, characterized in that, Comprising: A code disk, comprising: A signal area for receiving light and for generating a code signal based on the light; And An index area for generating an index signal based on the light, wherein the index signal represents a complete rotation of the code disk; Wherein the index area includes a first area and a second area larger than the first area; Wherein the first area is closer to the signal area than the second area; and A processing circuit for determining the rotation of the code disk based on the code signal and the index signal.
10. The encoding system according to claim 9, wherein The first area has a first width and the second area has a second width, and the first width is less than the second width.
11. The encoding system according to claim 9, wherein The index area is trapezoidal, the trapezoid having a short side and a long side opposite the short side, wherein the short side is closer to the signal area than the long side.
12. The encoding system according to claim 9, wherein The code disk includes a center, and the second area is closer to the center than the first area.
13. The encoding system according to claim 9, wherein, The code disk includes a center, and the width of the index area gradually decreases along the direction from the signal area to the center.
14. The encoding system according to claim 9, characterized in that, The signal area includes a signal track for generating the code signal.
15. The encoding system according to claim 14, wherein The signal track is for generating a first orthogonal signal and a second orthogonal signal as the code signal.
16. The encoding system according to claim 9, wherein The code disk includes a center, and the index area is closer to the center than the signal area.
17. The encoding system according to claim 9, wherein The index signal is blocked by the processing signal according to the code signal in the gated mode and is not blocked according to the code signal in the non-gated mode.
18. A code disk, characterized in that, Comprising: A signal area for receiving light and for generating a code signal based on the light; And An index area for generating a light pattern based on the light; Wherein the width of a first part of the light pattern is equal to the width of a second part of the light pattern, the first part being generated by a part of the index area closer to the signal area, and the second part being generated by a part of the index area farther from the signal area.
19. The code disc according to claim 18, characterized in that, The index area is trapezoidal, the trapezoid having a short side and a long side opposite the short side, wherein the short side is closer to the signal area than the long side.