CN205691142U - A kind of photoelectric code disk and encoder - Google Patents
A kind of photoelectric code disk and encoder Download PDFInfo
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- CN205691142U CN205691142U CN201620552399.9U CN201620552399U CN205691142U CN 205691142 U CN205691142 U CN 205691142U CN 201620552399 U CN201620552399 U CN 201620552399U CN 205691142 U CN205691142 U CN 205691142U
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- 230000005622 photoelectricity Effects 0.000 description 4
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Abstract
The utility model discloses a kind of photoelectric code disk and encoder, this code-disc includes: code-disc matrix, phase place code channel, zero-bit code channel and increment code channel；Wherein, phase place code channel, zero-bit code channel and increment code channel, load on one heart on the different-diameter circumference of code-disc matrix；Zero-bit code channel, including: the first zero-bit sequence (Z) and the second zero-bit sequence (/Z), the first zero-bit sequence (Z) and the second zero-bit sequence (/Z) are positioned at the both sides of increment code channel；The groove of the first zero-bit sequence (Z), including: 2～5 bright grid and 4～10 dark grid；The groove of the second zero-bit sequence (/Z), including: the dark grid identical with the bright grizzly bar number of the first zero-bit sequence (Z), and the bright grid identical with the dark grizzly bar number of the first zero-bit sequence (Z).Scheme of the present utility model, can overcome in prior art that contrast is low, certainty of measurement is low and the defect such as poor reliability, it is achieved contrast is high, certainty of measurement is high and the beneficial effect of good reliability.
Description
Technical Field
The utility model belongs to the technical field of the encoder, concretely relates to photoelectric encoder dish and encoder especially relate to a high contrast incremental encoder dish and have photoelectric encoder of this code wheel.
Background
The photoelectric encoder is a light, mechanical and electrical integrated angle measuring device, converts optical signals into electrical signals through a mechanical structure and a signal processing circuit, and accordingly realizes direct or indirect measurement of various physical quantities such as angular displacement, position and speed. In the incremental photoelectric encoder, the measurement and calculation of the position must be referred to by an absolute zero position (e.g., a reference position or a reference starting point during calculation), and therefore the absolute zero position of the encoder is one of the key points of the design of the incremental encoder, which affects the working performance and the measurement accuracy of the photoelectric encoder.
The zero grating (for example, a grating ruler with a coding line group for marking the zero) is composed of a group of light lines and dark lines with unequal intervals and unequal widths, when the zero grating moves relatively, sharp pulses (for example, direct abrupt pulse) with sharp changes can be formed, the processing circuit can take the sharp pulses as a door opening level (for example, when the input end of the circuit is connected with a rated load, the output end of the circuit is at the lowest input potential allowed by the upper limit of the low potential), and the absolute zero of the encoder is formed. The ratio of the secondary large luminous flux and the maximum luminous flux formed by the zero grating in the movement process is called contrast, the contrast of the zero grating of the existing incremental encoder is generally 1/2-1/3, and under the condition of strong electromagnetic interference, zero error codes are easy to appear, so that counting errors are caused, and the reliability of the encoder cannot meet the use requirement.
In the prior art, the defects of low contrast, low measurement precision, poor reliability and the like exist.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to above-mentioned defect, provide a photoelectricity code wheel and encoder to solve the problem that zero-bit grating contrast is low among the prior art, reach the effect that improves the absolute zero-bit degree of accuracy.
The utility model provides a photoelectric code wheel, include: the code disc comprises a code disc base body, a phase code channel, a zero code channel and an increment code channel; the phase code channel, the zero code channel and the incremental code channel are concentrically loaded on the circumferences of the coded disc base bodies with different diameters; the zero code channel includes: the first zero position sequence and the second zero position sequence are positioned on two sides of the incremental code channel; a scribe line for the first zero sequence comprising: 2-5 bright grids and 4-10 dark grids; a scribe line for the second zero sequence comprising: the number of the dark grids is the same as that of the bright grids in the first zero position sequence, and the number of the bright grids is the same as that of the dark grids in the first zero position sequence.
Optionally, the bright grating and/or the dark grating of the first zero sequence and the dark grating and/or the bright grating of the second zero sequence are arranged on two sides of the phase code channel in a mutually corresponding manner.
Optionally, the scribe line of the first zero bit sequence comprises: 5 light grids and 10 dark grids.
Optionally, the phase code channel includes: a first phase code channel, a second phase code channel and a third phase code channel; the first phase code channel is positioned on one side of the first zero sequence away from the incremental code channel; the second phase code channel is positioned on one side of the second zero bit sequence away from the incremental code channel; and the third phase code channel is positioned on one side of the second phase code channel far away from the second zero bit sequence.
Optionally, the scribing of the first phase code track includes: bright grids and dark grids which are uniformly distributed on the corresponding circumference of the coded disc base body and are alternately arranged in a bright mode and a dark mode.
Optionally, the first phase code channel, the second phase code channel and the third phase code channel have the same number of scribed lines, and a preset included angle is formed between the initial scribed lines; the number of the lines of carving and/or the preset included angle is adapted to the number of poles of the permanent magnet motor adapted to the coded disc.
Optionally, the incremental code channel includes: a first incremental code channel and a second incremental code channel; the scribing of the first incremental code channel and/or the second incremental code channel includes: bright grids and dark grids which are uniformly distributed on the corresponding circumference of the coded disc base body and are alternately arranged in a bright mode and a dark mode.
Optionally, the number of scribed lines of the incremental code track includes: at least one of 512, 1024 and 2500 strips.
Optionally, the code wheel base includes: an optical glass plate.
Optionally, the optical glass plate is annular.
With above-mentioned code wheel phase-match, the utility model discloses another aspect provides an encoder, include: the photoelectric code disc is described above.
The utility model discloses a scheme, contrast through reinforcing photoelectric encoder zero-bit sequence can improve the degree of accuracy of absolute zero-bit to guarantee the reliability of encoder in the application, and then solve the not enough problem of photoelectric encoder code wheel zero-bit sequence (zero-bit grating promptly) contrast, and solve the unusual problem of absolute zero-bit of encoder in the application.
Furthermore, the proposal of the utility model can effectively improve the accuracy of the absolute zero position of the incremental photoelectric encoder by using the code wheel (such as the code wheel of the incremental encoder) of the high-contrast zero position sequence, ensure the measurement precision and the working reliability of the photoelectric encoder and also improve the reliability of the encoder in the application process.
Therefore, the utility model discloses a scheme utilizes the mode of the contrast of reinforcing zero-bit sequence, solves the problem that zero-bit grating contrast is low among the prior art to, overcome the low, the low and poor defect of reliability of contrast among the prior art, realize that the contrast is high, measurement accuracy is high and good reliability's beneficial effect.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an optoelectronic code disc of the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of a zero code channel and an incremental code channel in the optical code disc of the present invention;
fig. 3 is a partially enlarged schematic view of an embodiment of the S portion in fig. 2.
With reference to the accompanying drawings, the embodiments of the present invention have the following reference numerals:
100-code wheel base.
Detailed Description
To make the purpose, technical solution and advantages of the present invention clearer, the following will combine the embodiments of the present invention and the corresponding drawings to clearly and completely describe the technical solution of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
According to the utility model discloses an embodiment provides a photoelectricity code wheel, as shown in fig. 1 the utility model discloses a structural schematic diagram of an embodiment of photoelectricity code wheel. The photoelectric code disc can comprise: a code wheel base body 100, a phase code channel, a zero code channel and an increment code channel.
For example: as shown in FIG. 1, the photoelectric code disc is composed of zero code channels Z,/Z, a phase code channel U, V, W, an increment code channel A, B and a code disc base body 100.
The phase code channel, the zero code channel and the incremental code channel are concentrically loaded on the circumferences of the coded disc base body 100 with different diameters.
Specifically, the zero code channel may include: a first zero position sequence Z and a second zero position sequence/Z, wherein the first zero position sequence Z and the second zero position sequence/Z are positioned at two sides of the incremental code channel; the reticle of the first zero sequence Z comprises: 2-5 bright grids and 4-10 dark grids; a reticle for the second zero sequence/Z comprising: the number of the bright grids is the same as that of the bright grids in the first zero position sequence Z, and the number of the bright grids is the same as that of the dark grids in the first zero position sequence Z.
For example: the zero code channel consists of a zero sequence Z and a zero sequence/Z.
Therefore, the contrast of the zero sequence can be enhanced by setting the number of the bright grids and the dark grids of the zero sequence, so that the problem of insufficient contrast of the existing code wheel zero sequence is solved, and the accuracy of absolute zero is favorably improved.
Optionally, the bright grating and/or the dark grating of the first zero sequence Z and the dark grating and/or the bright grating of the second zero sequence/Z are arranged on two sides of the phase code channel in a mutually corresponding manner.
For example: as shown in fig. 2 and 3, the sequence order of the zero bit sequence Z is: "101000100100001", where "1" represents a light gate and "0" represents a dark gate. The sequence order of the zero bit sequence/Z is: "010111011011110".
Therefore, the zero-position sequence Z in the zero-position code channel and the corresponding arrangement of the bright grating and the dark grating in the zero-position sequence/Z are beneficial to further improving the contrast of the zero-position sequence, and the accuracy and the reliability of measurement by using the code wheel are beneficial to improving.
Optionally, the line of the first zero sequence Z may include: 5 light grids and 10 dark grids.
For example: the zero sequence Z consists of 5 bright grids and 10 dark grids; and the zero position sequence/Z consists of 10 bright grids and 5 dark grids.
For example: when the zero sequence moves, the formed maximum luminous flux is 5, the secondary large luminous flux is 1, the formable contrast value is 1/5, the contrast is obviously higher than that of the zero sequence of the general incremental encoder, the zero error code phenomenon is not easy to occur even under the application condition of strong interference, the accuracy of absolute zero is ensured, and the measurement precision and the working reliability of the photoelectric encoder are improved.
For example: alternatively, by removing part of the bright grating and the dark grating in the zero sequence, the zero sequence can still be used (for example, the contrast value is 1/3-1/2), but the maximum light flux and the contrast of the zero grating are reduced, the accuracy of the absolute zero of the incremental encoder is reduced, and the measurement precision and the working reliability of the photoelectric encoder are also reduced.
Therefore, through the high-contrast setting of the bright grating and the dark grating in the zero-bit sequence, the anti-interference capability of the code wheel can be improved, and the accuracy of the absolute zero bit is ensured.
In an alternative embodiment, the phase code channel may include: a first phase code channel U, a second phase code channel V and a third phase code channel W.
For example: the phase code channel consists of U, V, W.
The first phase code channel U is positioned on one side of the first zero sequence Z away from the incremental code channel; the second phase code channel V is positioned on one side of the second zero bit sequence/Z far away from the incremental code channel; and the third phase code channel W is positioned on one side of the second phase code channel V far away from the second zero bit sequence/Z.
For example: and the phase code channel can be used for providing a magnetic pole position for the driver when the motor is started.
Therefore, the accurate and reliable magnetic pole position can be better provided for the driver through the phase code channels arranged in a layered mode, and the safety is good.
Optionally, the scribing of the first phase code channel U may include: and bright grids and dark grids which are uniformly distributed on the corresponding circumference of the code disc base body 100 and have alternate light and dark.
For example: 4 bright bars and 4 dark bars are uniformly distributed and alternately bright and dark.
Therefore, the arrangement of the uniformly distributed bright grids and the dark grids at intervals of light and shade is beneficial to further improving the accuracy and the reliability of the magnetic pole position.
Optionally, the number of scribed lines of the first phase code channel U, the second phase code channel V and the third phase code channel W is the same, and a preset included angle is formed between the initial scribed lines; the number of the lines of carving and/or the preset included angle is adapted to the number of poles of the permanent magnet motor adapted to the coded disc.
For example: the number of the phase code channel lines and the included angle between the initial lines are related to the number of poles of the permanent magnet motor.
For example: the scribed lines of the 8-pole motor are 8, 4 bright grids and 4 dark grids.
For example: u, V, W are sequentially spaced at 30 deg. intervals.
Therefore, the matching arrangement of the number of the scribed lines, the included angle between the initial scribed lines and the number of poles of the permanent magnet motor is beneficial to improving the working reliability and safety of the permanent magnet motor.
In an optional embodiment, the incremental code channel may include: a first incremental code channel A and a second incremental code channel B; the scribing of the first incremental code channel a and/or the second incremental code channel B may include: and bright grids and dark grids which are uniformly distributed on the corresponding circumference of the code disc base body 100 and have alternate light and dark.
For example: the incremental code channel is composed of A, B, and its reticle is uniformly distributed and has light and dark spaces for counting angle or position.
Therefore, two paths of pulse signals can be output through two paths of incremental code channels; the accuracy and the reliability of pulse signal output can be improved by uniformly distributing bright grids and dark grids which are alternately arranged in a bright and dark mode.
Optionally, the number of the incremental code tracks may include: at least one of 512, 1024 and 2500 strips.
For example: the number of the graduations of the incremental code tracks determines the resolution of the encoder, and the commonly used graduations are 512, 1024, 2500 and the like.
Therefore, the incremental code channel with the number of the lines can be adaptively selected, various measurement resolutions can be provided, the method is suitable for various occasions needing pulse signal output, and the method is high in universality and reliability.
In an alternative embodiment, the code wheel base 100 may include: an optical glass plate.
For example: the coded disc substrate is optical glass and is a carrier for scribing each code channel.
Therefore, the optical glass plate is used as the coded disc base body, so that the optical performance is good, and the measurement accuracy and reliability are good.
Optionally, the optical glass plate is annular. The annular code wheel base body is light in weight and flexible in rotation, and the working flexibility and reliability of the code wheel can be improved.
Through a large number of tests, the technical scheme of the embodiment is adopted, and the contrast of the zero-position sequence of the photoelectric encoder is enhanced, so that the accuracy of the absolute zero position can be improved, the reliability of the encoder in the application process is ensured, the problem of insufficient contrast of the zero-position sequence of the code disc of the photoelectric encoder is solved, and the problem of abnormal absolute zero position of the encoder in the application process is solved.
According to the utility model discloses an embodiment still provides an encoder corresponding to photoelectricity code wheel. The encoder includes: the photoelectric code disc is described above.
In one example, the optical encoder may be a high contrast zero-order code wheel.
In one example, the encoder may be an optical encoder.
In one example, the photoelectric encoder may be an incremental encoder or an absolute encoder.
In one embodiment, as shown in fig. 1, the structure of the above-mentioned photoelectric code wheel (i.e. incremental encoder code wheel) may include: zero code channel Z,/Z, phase code channel U, V, W, increment code channel A, B and code disc base body. The accuracy of the absolute zero position of the incremental photoelectric encoder is improved by enhancing the contrast of the zero position sequence of the code disc, and the measurement precision and the working reliability of the photoelectric encoder are further ensured.
The zero code channel is composed of zero sequences Z and/Z, as shown in fig. 2 and 3, where the sequence order of Z is: "101000100100001" ("1" for light grid and "0" for dark grid), consisting of 5 light grids and 10 dark grids; wherein the sequence order of/Z is: "010111011011110", consisting of 10 light grids and 5 dark grids; when the zero sequence moves, the formed maximum luminous flux is 5, the secondary large luminous flux is 1, the formable contrast value is 1/5, the contrast is obviously higher than that of the zero sequence of the general incremental encoder, the zero error code phenomenon is not easy to occur even under the application condition of strong interference, the accuracy of absolute zero is ensured, and the measurement precision and the working reliability of the photoelectric encoder are improved.
The sequence order of the zero bit sequence Z and/Z may be other order matching with the actual requirement of the user.
The phase code channel consists of U, V, W, and the number of the lines and the included angle between the initial lines are related to the number of poles of the permanent magnet motor, and are used for providing magnetic pole positions for the driver when the motor is started; for example, the scribed lines of the 8-pole motor are 8, 4 bright grids and 4 dark grids, the uniform distribution mode is adopted, and the bright grids and the dark grids are alternated; u, V, W are sequentially spaced at 30 deg. intervals.
The incremental code channel consists of A, B, the scribed lines of the incremental code channel are uniformly distributed, and the segments are alternately bright and dark and are used for counting angles or positions; the number of the lines determines the resolution of the encoder, and the number of the lines is usually 512, 1024, 2500, etc.
The coded disc substrate is optical glass and is a carrier for scribing each code channel.
In an optional embodiment, the encoder may further include: a photoelectric detection device; and the photoelectric detection device is matched and installed with the photoelectric coded disc.
Optionally, the photodetecting device comprises: the LED light source comprises a structural body (such as mechanical structural parts including a mounting shaft, a bearing, a mounting bracket, a mounting table top and the like), an LED, a photosensitive unit and a signal processing circuit.
For example: the structural body and the photosensitive unit are respectively matched and installed with the coded disc; and the LED and the photosensitive unit are connected to the signal processing circuit in an adaptive manner.
Since the processing and functions implemented by the encoder of the present embodiment basically correspond to the embodiments, principles and examples of the code wheel shown in fig. 1 to fig. 3, the description of the present embodiment is not detailed, and reference may be made to the related descriptions in the foregoing embodiments, which are not repeated herein.
Through a large amount of tests verification, adopt the technical scheme of the utility model, through using the code wheel of high contrast zero-bit sequence (for example: increment encoder code wheel), can effectively improve the degree of accuracy of the absolute zero-bit of increment formula photoelectric encoder, guarantee photoelectric encoder's measurement accuracy and operational reliability, can also improve the reliability in the encoder application.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
The above description is only an example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (11)
1. An electro-optical code wheel, comprising: a coded disc base body (100), a phase code channel, a zero code channel and an increment code channel; wherein,
the phase code channel, the zero code channel and the incremental code channel are concentrically loaded on the circumferences of the coded disc base body (100) with different diameters;
the zero code channel includes: a first zero bit sequence (Z) and a second zero bit sequence (/ Z), the first zero bit sequence (Z) and the second zero bit sequence (/ Z) are positioned on two sides of the incremental code track;
a reticle of the first zero sequence (Z), comprising: 2-5 bright grids and 4-10 dark grids;
a reticle of the second zero sequence (/ Z), comprising: dark grids with the same number of bright grids as the first zero sequence (Z), and bright grids with the same number of dark grids as the first zero sequence (Z).
2. The code wheel of claim 1, characterized in that the bright and/or dark bars of the first null sequence (Z) and the dark and/or bright bars of the second null sequence (/ Z) are arranged on both sides of the phase track in correspondence with each other.
3. The code wheel according to claim 1 or 2, characterized in that the scribed lines of the first zero sequence (Z) comprise: 5 light grids and 10 dark grids.
4. The code wheel according to claim 1 or 2, characterized in that the phase code channel includes: a first phase code channel (U), a second phase code channel (V) and a third phase code channel (W); wherein,
the first phase code channel (U) is positioned on one side of the first zero bit sequence (Z) far away from the incremental code channel;
the second phase code channel (V) is positioned on one side of the second zero bit sequence (/ Z) far away from the incremental code channel;
the third phase code channel (W) is positioned on one side of the second phase code channel (V) far away from the second zero bit sequence (/ Z).
5. The code wheel of claim 4, wherein the scribes of the first phase track (U) include: bright grids and dark grids which are uniformly distributed on the corresponding circumference of the coded disc base body (100) and are alternately arranged in a bright and dark mode.
6. The code wheel of claim 5, characterized in that the first phase code channel (U), the second phase code channel (V) and the third phase code channel (W) have the same number of scribed lines, and the initial scribed lines have a preset included angle therebetween;
the number of the lines of carving and/or the preset included angle is adapted to the number of poles of the permanent magnet motor adapted to the coded disc.
7. The code wheel according to claim 1 or 2, characterized in that the incremental code track comprises: a first incremental code channel (A) and a second incremental code channel (B);
the scribing of the first incremental code channel (a) and/or the second incremental code channel (B) comprises: bright grids and dark grids which are uniformly distributed on the corresponding circumference of the coded disc base body (100) and are alternately arranged in a bright and dark mode.
8. The code wheel of claim 7, wherein the number of graduations of the incremental code tracks comprises: at least one of 512, 1024 and 2500 strips.
9. The code wheel according to claim 1 or 2, characterized in that the code wheel base body (100) comprises: an optical glass plate.
10. The code wheel of claim 9, characterized in that the optical glass plate is annular.
11. An encoder, comprising: the electro-optical code wheel of any of claims 1-10.
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| CN201620552399.9U CN205691142U (en) | 2016-06-08 | 2016-06-08 | A kind of photoelectric code disk and encoder |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105953824A (en) * | 2016-06-08 | 2016-09-21 | 珠海格力节能环保制冷技术研究中心有限公司 | Photoelectric encoding disc and encoder |
| CN106525090A (en) * | 2016-12-30 | 2017-03-22 | 横川机器人（深圳）有限公司 | Incremental coded disk with single-turn absolute value torque motor |
| CN110794383A (en) * | 2019-11-07 | 2020-02-14 | 上海禾赛光电科技有限公司 | Code disc, photoelectric encoder and laser radar |
| CN114353842A (en) * | 2021-12-15 | 2022-04-15 | 苏州汇川控制技术有限公司 | Multi-group vernier code disc, photoelectric encoder and light source position calculating method |
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2016
- 2016-06-08 CN CN201620552399.9U patent/CN205691142U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105953824A (en) * | 2016-06-08 | 2016-09-21 | 珠海格力节能环保制冷技术研究中心有限公司 | Photoelectric encoding disc and encoder |
| CN106525090A (en) * | 2016-12-30 | 2017-03-22 | 横川机器人（深圳）有限公司 | Incremental coded disk with single-turn absolute value torque motor |
| CN106525090B (en) * | 2016-12-30 | 2019-05-31 | 横川机器人（深圳）有限公司 | A kind of band individual pen absolute value forces torque motor increment type coding disk |
| CN110794383A (en) * | 2019-11-07 | 2020-02-14 | 上海禾赛光电科技有限公司 | Code disc, photoelectric encoder and laser radar |
| CN114353842A (en) * | 2021-12-15 | 2022-04-15 | 苏州汇川控制技术有限公司 | Multi-group vernier code disc, photoelectric encoder and light source position calculating method |
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