CN109238316B - Transmission and reflection integrated grating assembly - Google Patents
Transmission and reflection integrated grating assembly Download PDFInfo
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- CN109238316B CN109238316B CN201811125821.2A CN201811125821A CN109238316B CN 109238316 B CN109238316 B CN 109238316B CN 201811125821 A CN201811125821 A CN 201811125821A CN 109238316 B CN109238316 B CN 109238316B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 27
- 229910052751 metal Inorganic materials 0.000 claims abstract description 28
- 239000002184 metal Substances 0.000 claims abstract description 28
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 abstract description 2
- 239000013307 optical fiber Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Couplings Of Light Guides (AREA)
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Abstract
The invention discloses a transflective integrated grating assembly, which comprises: the optical fiber comprises a metal seat, a transmission type grating and a reflection type grating, wherein the transmission type grating is directly connected with the metal seat; the emission type grating is directly arranged on the transmission type grating and corresponds to the metal seat. The scheme provided by the invention forms the transmission and reflection integrated grating component by unique composition application of the transmission grating and the reflection grating, can stably and accurately output signals such as U\V\W and the like, has the characteristics of higher cost performance and the like, and effectively solves the problems existing in the prior art.
Description
Technical Field
The present invention relates to encoder technology, and in particular to raster technology in encoders.
Background
With the development of scientific technology and industrial automation, automatic control technology has been increasingly used in various fields. The servo system using the servo motor as a control object is gradually applied to aspects of industrial production, scientific research, national defense and the like.
With rapid development of software and hardware, various devices (such as industrial robots, numerical control machine tools, aerospace devices and the like) have higher and higher requirements on servo systems, such as: short response time, high stability of rotation speed and torque, high positioning accuracy and the like, and the control mode of the motor is highly required. At present, a relatively mature control method for servo driving is vector control; in order to achieve accurate vector control, an accurate encoder UVW signal is required to perform initial positioning when the motor is started.
The current mainstream modes for realizing the output of the UVW signal by the encoder mainly comprise the following modes: 1. the traditional multipoint light-emitting and receiving module generates a UVW signal corresponding to the traditional glass or film grating; 2. the Hall element module generates a UVW signal; 3. the optoelectronic device generates a UVW signal corresponding to the reflective grating. These implementations suffer from more or less drawbacks.
1. The traditional glass or film grating is adopted to generate a UVW signal, and the following defects exist:
a) The interior of the photoelectric device is simultaneously integrated ABZUVW for treatment, the price is high, and the size of the device is large;
b) The requirements on the original signals are high, and the grating is sensitive to the gaps, so that the installation is not facilitated;
c) Glass gratings are less resistant to anomalies such as vibration, shock, etc.
2. The Hall element is adopted to generate a UVW signal, and the following defects exist:
a) The photoelectric device processes the ABZ signal, the Hall element processes the UVW signal, and the two processing modes are different and need to be processed in a scattered way, so that the structural form is not compact enough, and the axial occupation size is larger;
b) Hysteresis exists in the Hall device, and reaction hysteresis exists under the conditions of high rotating speed, forward and reverse rotation and the like;
c) In the case of mounting a brake or the like, the hall element may interfere with the operation of the brake.
3. The use of reflective gratings to generate UVW signals has the following drawbacks:
a) The reflective coating has complex processing and mounting process, and the existing integrated reflective grating has high price;
b) The reflective IC has higher price and the low cost requirement cannot be met;
c) The reflective chip LPI is larger, and can not meet the use requirements in the face of low resolution, small volume and the like.
Disclosure of Invention
Aiming at the problems of the prior encoder output UVW signal scheme, a new encoder UVW signal output scheme is needed.
Therefore, the invention aims to provide a transflective integrated grating assembly which can stably and accurately output signals such as U\V\W and the like, and has low cost and high reliability.
In order to achieve the above object, the present invention provides a transflective integrated grating assembly, comprising:
A metal seat;
the transmission type grating is directly connected with the metal seat;
the reflection type grating is directly arranged on the transmission type grating and corresponds to the metal seat.
Further, the metal seat is annular, and a spigot with a step structure is arranged on the metal seat.
Furthermore, the transmission type grating is round as a whole, and a plurality of light drawing slit stripes are arranged on the transmission type grating.
Furthermore, the transmissive grating is directly bonded with the metal seat.
Furthermore, the reflection grating mirror surface is made of stainless steel, and corresponding bright and dark areas are etched on the mirror surface according to the pole pair number of the motor.
Further, the reflective grating is directly disposed on the transmissive grating.
The scheme provided by the invention forms the transmission and reflection integrated grating component by unique composition application of the transmission grating and the reflection grating, can stably and accurately output signals such as U\V\W and the like, has the characteristics of higher cost performance and the like, and effectively solves the problems existing in the prior art.
Drawings
The invention is further described below with reference to the drawings and the detailed description.
FIG. 1 is a front view of a transflective integrated grating assembly in accordance with an embodiment of the present invention;
FIG. 2 is a bottom view of a transflective integrated grating assembly according to an example of the present invention;
fig. 3 is an exploded view of a transflective integrated grating assembly in accordance with an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the invention easy to understand.
Aiming at the problems faced by the prior UVW signal output scheme of the encoder, the embodiment discards the prior arrangement scheme, creatively organically combines the transmission type grating and the reflection type grating to form a transmission and reflection integrated grating component, and stably and accurately outputs U\V\W and other signals.
Referring to fig. 1-3, one example structure of a transflective integrated grating assembly provided in this example is shown.
As can be seen from the figure, the structure of the transflective integrated grating assembly 100 in the structure is mainly composed of a metal base 110, a transmissive grating 120 and a reflective grating 130.
The middle part of the transmissive grating 120 is directly connected to the metal base 110, and the reflective grating 130 is directly disposed on the transmissive grating 120 relative to the metal base 110.
The formed transmission and reflection integrated grating assembly only comprises the metal seat 110, the transmission type grating 120 and the reflection type grating 130, and the transmission type grating and the reflection type grating are combined into a whole, so that the whole grating assembly is compact in volume; meanwhile, in the grating component, the transmission type grating is utilized to carry out ABZ signal processing, the reflection type grating is utilized to process UVW signals, and the transmission type grating and the reflection type grating are matched with each other to realize accurate output of U\V\W signals and the like.
With respect to the principle of the above-described scheme, a specific embodiment of the present example (see fig. 1 to 3) will be described below.
The metal base 110 in the present grating assembly serves as a mounting base for the entire grating assembly for mounting and supporting the transmissive grating 120 and the reflective grating 130 in the grating assembly.
The metal base 110 is preferably in a circular ring shape, and is provided with a circular ring spigot for ensuring coaxiality of the grating and the metal base; meanwhile, a corresponding step surface 111 is arranged at the circular ring seam allowance on the metal seat 110 and is used for supporting the grating and providing a glue solution bonding surface.
In the example, the metal seat 110 with the structure adopts an aluminum bar cutting mode to form a double-jackscrew locking mode, and an annular hollow structure is formed, so that the design of an output shaft is facilitated, and meanwhile, the installation and the positioning are simple and reliable; the manufacturing is simple, the product quality is stable and reliable, and the price is low.
The transmissive grating 120 in the present grating assembly is used for ABZ signal processing.
The transmissive grating 120 is circular in shape as a whole, and simultaneously, slit fringes are optically painted at the corresponding positions of the grating, and optical signals required by the encoder are generated by the interference fringe principle.
The transmission type grating 120 with the structure is directly adhered to the metal seat 110 by strong glue, and is coaxially installed with the metal seat 110 based on a circular ring spigot on the metal seat 110.
When the transmission type grating 120 coaxially arranged on the metal base 110 is driven to rotate by the output shaft, light emitted by the light emitting element is cut into intermittent light by a slit on the transmission type grating 120, thereby generating an initial signal, and the signal is received by the receiving element and is processed later, and then an ABZ signal is output.
The reflective grating 130 in the present grating assembly is used for UVW signal processing. The reflection grating 130 is formed by using mirror surface stainless steel as a base material, and a corresponding bright and dark region is etched in a mirror surface region according to the pole pair number of the motor.
The reflective grating 130 includes a circular body 131, and two circular convex edges 132 and 133 are symmetrically disposed along the outer side of the circular body 131. The two circular arc convex edges 132 and 133 have the same structure and are formed by extending the outer side surface of the circular ring-shaped body 131 horizontally outwards, thereby being used as a bright area, namely a reflecting area; and the hollowed-out area between the two is a dark area, namely a non-reflection area. Further, in this embodiment, the length of each circular arc convex edge (i.e. the bright area) is 1/4-1/3 of the circumference of the circular ring-shaped body 131, and the width of each circular arc convex edge is 1-1.5 times of the width of the circular ring-shaped body 131, so that the stability of the reflective grating 130 is higher than that of a conventional reflective grating, and the formed signal is stronger.
The reflective grating 130 having such a structure is coated with an epoxy resin adhesive on the surface thereof and is directly adhered and fixed to the transmissive grating 120 while maintaining a coaxial mounting state with the metal base 110 and the transmissive grating 120.
When the reflective grating 130 coaxially arranged on the transmissive grating 120 is driven to rotate by the output shaft, light emitted by the light emitting element irradiates the surface of the reflective grating 130 through the transmissive grating 120, is divided by the reflective and non-reflective areas on the reflective grating 130, selectively reflects a part of the light to the sensor, generates an initial signal, and outputs a UVW signal after subsequent processing.
In addition, the form and the size of the reflective grating can be adjusted according to the pole pair number of the motor in specific application. That is, the bright-dark area of the reflective grating 130 is adjusted according to the pole pair number of the motor, if there is 2 pairs of poles, 2 bright-dark area changes are made on the reflective grating 130, and if there is 3 pairs of poles, 3 bright-dark areas are made on the reflective grating 130.
When the formed transmission and reflection integrated grating component outputs encoder signals, light emitted by the light-emitting element generates ABZ signals through the transmission grating, and the low, medium and high encoder resolution requirements can be realized according to different sensing devices; meanwhile, the light emitted by the light emitting element enters the reflective grating, and the reflective grating generates a UVW signal: the method has the characteristics of low cost, quick response, high precision, good output consistency, easy integration, no interference by magnetic fields of motors and brakes and the like; meanwhile, the transparent and reflective integrated grating component is relatively low in price on the premise of ensuring high reliability.
Furthermore, the whole grating component has lower overall manufacturing difficulty, high integration degree, compact volume, low cost and high cost performance.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The reflection-transmission integrated grating assembly is characterized by comprising:
A metal seat;
the transmission type grating is directly connected with the metal seat;
The reflective grating is directly arranged on the transmission grating and corresponds to the metal seat.
2. The transflective integrated grating assembly according to claim 1, wherein the metal base is circular and has a spigot with a stepped structure.
3. The transflective integrated grating assembly according to claim 1, wherein the transmissive grating is generally circular with a plurality of light-painted slit stripes disposed thereon.
4. The transflector integrated grating assembly according to claim 1, wherein the transmissive grating is directly bonded to the metal base.
5. The transflective integrated grating assembly according to claim 1, wherein the reflective grating is formed of mirror stainless steel and corresponding dark and bright areas are etched in the mirror according to motor pole pair numbers.
6. The transflective integrated grating assembly according to claim 1, wherein the reflective grating is disposed directly on the transmissive grating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811125821.2A CN109238316B (en) | 2018-09-26 | 2018-09-26 | Transmission and reflection integrated grating assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811125821.2A CN109238316B (en) | 2018-09-26 | 2018-09-26 | Transmission and reflection integrated grating assembly |
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| Publication Number | Publication Date |
|---|---|
| CN109238316A CN109238316A (en) | 2019-01-18 |
| CN109238316B true CN109238316B (en) | 2024-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811125821.2A Active CN109238316B (en) | 2018-09-26 | 2018-09-26 | Transmission and reflection integrated grating assembly |
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| Country | Link |
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| CN (1) | CN109238316B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000321097A (en) * | 1999-05-12 | 2000-11-24 | Harmonic Drive Syst Ind Co Ltd | Optical encoder |
| CN204496260U (en) * | 2015-03-06 | 2015-07-22 | 上海鲍麦克斯电子科技有限公司 | A kind of scrambler lenticular lenses rib device |
| CN209166469U (en) * | 2018-09-26 | 2019-07-26 | 上海市雷智电机有限公司 | A kind of transflection integral type grating assembly |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4641027A (en) * | 1984-12-18 | 1987-02-03 | Battelle Memorial Institute | Indicating positions |
| JPH11142187A (en) * | 1997-11-13 | 1999-05-28 | Fuji Electric Co Ltd | Rotary encoder |
| US6610975B2 (en) * | 2000-12-07 | 2003-08-26 | Harmonic Drive Systems, Inc. | Optical encoder |
| JP4269246B2 (en) * | 2001-05-18 | 2009-05-27 | 株式会社安川電機 | Encoder and motor with encoder |
| JP4667653B2 (en) * | 2001-06-20 | 2011-04-13 | 株式会社ハーモニック・ドライブ・システムズ | Optical encoder |
| JP2003172638A (en) * | 2001-12-07 | 2003-06-20 | Harmonic Drive Syst Ind Co Ltd | Optical encoder |
| JP2004333342A (en) * | 2003-05-09 | 2004-11-25 | Harmonic Drive Syst Ind Co Ltd | Projection encoder |
| US7683300B2 (en) * | 2006-10-17 | 2010-03-23 | Asml Netherlands B.V. | Using an interferometer as a high speed variable attenuator |
| DE102013203713A1 (en) * | 2013-03-05 | 2014-02-13 | Carl Zeiss Smt Gmbh | Incremental encoder for use in lithography device for detecting displacements or movements of optical elements, has lower movable reference grid and upper movable reference grid that include different lattice constants in optical path |
| JP6035467B2 (en) * | 2014-03-31 | 2016-11-30 | 並木精密宝石株式会社 | Reflective encoder |
| CN106123934B (en) * | 2016-08-26 | 2019-01-25 | 长春禹衡光学有限公司 | A kind of split type grating encoder |
| CN106931998A (en) * | 2017-04-26 | 2017-07-07 | 苏州睿牛机器人技术有限公司 | A kind of novel photoelectric code sensor |
-
2018
- 2018-09-26 CN CN201811125821.2A patent/CN109238316B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000321097A (en) * | 1999-05-12 | 2000-11-24 | Harmonic Drive Syst Ind Co Ltd | Optical encoder |
| CN204496260U (en) * | 2015-03-06 | 2015-07-22 | 上海鲍麦克斯电子科技有限公司 | A kind of scrambler lenticular lenses rib device |
| CN209166469U (en) * | 2018-09-26 | 2019-07-26 | 上海市雷智电机有限公司 | A kind of transflection integral type grating assembly |
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| CN109238316A (en) | 2019-01-18 |
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