CN102297705A - Conductive plastic pulse counting sensor - Google Patents
Conductive plastic pulse counting sensor Download PDFInfo
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- CN102297705A CN102297705A CN 201110131570 CN201110131570A CN102297705A CN 102297705 A CN102297705 A CN 102297705A CN 201110131570 CN201110131570 CN 201110131570 CN 201110131570 A CN201110131570 A CN 201110131570A CN 102297705 A CN102297705 A CN 102297705A
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Abstract
The invention discloses a conductive plastic pulse counting sensor which is composed of two parts, namely a conductive plastic signal source part and a signal processing micro-circuit module. A conductive plastic strip-shaped coded disc is used as a core part of the sensor; by utilizing two groups of signal sources generated by sliding of the conductive plastic strip-shaped coded disc and an electric brush of a movable contact, two groups of pulse signals are synchronously connected in an inner structure through the conductive plastic strip-shaped coded disc and the shell respectively and are connected with the micro-circuit module through wired, therefore, internal communication is completed; two group of signal sources are simultaneously transmitted into the micro-circuit module of the sensor; one group of signal sources are processed into pulse counting, thus an accumulation counting function can be realized through a plurality of rings; and the other group of signal sources are processed into phase detection signals, thus a reversible counting function is realized. The sensor disclosed by the invention has the characteristics of simple and firm structure, flexibility and convenience in installation, hundreds of millions of wearable service life, high reliability, high precision, strong anti-interference capability and the like. The sensor can output digital signals directly so that the requirements of a modern intelligent measurement and control system in the optical, mechanical and electronic integral field are satisfied.
Description
Technical field
The present invention relates to a kind of pulse counting sensor, relate in particular to a kind of conductive plastics pulse counting sensor.Be applicable to the computer measurement and control system in the optical, mechanical and electronic integration field.
Background technology
In the market with voltage or the conductive plastics sensor application of current forms carry-out bit shifting signal is more extensive, but this series products output is a kind of analog signals, could be used by computer measurement and control system after also will changing by circuit module or conversion of signals device.At present, automatic control system, servo-drive system and information feedback system in the displacement conductive plastics sensor application field are still to receive this two analoglikes amount signal.For the new application field that with the computing machine is the control core, the input of analog signals is that pattern/number conversion circuit is realized, there is residual voltage in the signal amplification circuit output terminal in the change-over circuit, has increased the non-linear index of sensor virtually, thus the measuring accuracy of having lost sensor.In addition, the conductive plastics sensor is long-time use after, easily produce moment between brush and the resistive element to contact breakpoint, this is the fatal defective of this class sensor.
The TT﹠C system in optical, mechanical and electronic integration field requires to provide the sensor that can directly export digital pulse signal, and the domestic and international market has photoelectricity, Hall, scrambler etc. all can directly export digital signal at present.Photoelectric sensor produces pulse square wave by photovoltaic principals, and through conversion line output digital signal, it costs an arm and a leg, and structural volume is big, and shockproof function is poor, can not adapt to harsh working environment.Hall element, the working method that produces the square-wave pulse counting is to use Hall element to mix under the effect of circuit by magnet steel and speed increasing mechanism again, meet the requirements of square-wave pulse quantity, this structural principle uses by practice, find the easy stuck inefficacy of its speed increasing mechanism, the speed increasing mechanism wearing and tearing produce the gap and reduce precision.In addition, Hall magnetic field is vulnerable to electromagnetic interference (EMI) and loses pulse signal, or causes the output signal entanglement.This product structure is complicated, trouble is installed, problems such as constitutional detail fragmentation often appear in actual use, therefore, its poor reliability, serviceable life are short, profile physical dimension coupling is difficult, working environment requires many unfavorable factors such as height and poor anti jamming capability, do not adapt to the demand of modern high performance, high reliability optical, mechanical and electronic integration field TT﹠C system.
Summary of the invention
The objective of the invention is to: solve the many bad problem of the above two class sensor, a kind of novel conductive plastics pulse transducer is provided.
Purpose of the present invention realizes by following scheme: conductive plastics signal source parts and signal microcircuit module two are partly formed; Conductive plastics signal source parts comprise that the first conductive plastics bar shaped code-disc and the second conductive plastics bar shaped code-disc all produce two group pulse signal sources with the slip of two groups of corresponding moving contact brush parts; The signal microcircuit module will be wherein one group of processing signals source be step-by-step counting and produce the accumulated counts function that another group processing signals source is that the impulse phase detection signal is realized the reversible counting function by multi-turn.
Conductive plastics signal source parts of the present invention comprise: housing, be arranged on the first conductive plastics bar shaped code-disc of inner walls, be arranged on the synchronous of housing upper end, be arranged on the second conductive plastics bar shaped code-disc of synchronous inwall, be arranged on the clutch shaft bearing of inner walls, be arranged on second bearing of synchronous inwall, pass the rotating shaft sleeve member of two bearings, be arranged on the brush parts on the rotating shaft sleeve member, be arranged on the first spacing back-up ring that is used on the rotating shaft sleeve member, be arranged on the second spacing back-up ring that is used on the rotating shaft sleeve member, be arranged on the first exit parts of housing side, be arranged on the second exit parts of housing side, be arranged on the three terminal parts of synchronous side, be arranged on the 4th exit parts of synchronous side, be arranged on the lead on the first exit parts of housing side, be arranged on the lead on the second exit parts of housing side, be arranged on the lead on the three terminal parts of synchronous side, be arranged on the lead on the 4th exit parts of synchronous side; Signal Processing microcircuit module parts comprise: microcircuit module assembly, protection panel, be arranged at the gang socket of protection on the panel; Anti-six anti-inserted pin gang sockets are directly inserted with the communication of TT﹠C system and are connected contact pin.
Effective operating angle of product of the present invention is 360 °/every circle, but the arbitrfary point zero clearing, no dead band.
The present invention is in the outer face of sensor housing, and the threaded hole that is provided for installing is installed the axial line of end face perpendicular to rotating shaft.
The rotating shaft sleeve member that sensor of the present invention stretches out is provided with mills flat feature.
The present invention is designed to integral structure with conductive plastics signal source parts and signal Processing microcircuit module, internal communication adopts lead on the first exit parts be arranged on the housing side, be arranged on lead on the second exit parts of housing side, be arranged on lead on the three terminal parts of synchronous side, be arranged on the 4th exit parts of synchronous side lead totally four leads connect.
Gang socket of the present invention is the anti-anti-inserted sockets of six pins.
The two group pulse signal sources that the first conductive plastics bar shaped code-disc of the present invention and the second conductive plastics bar shaped code-disc produce, continuous output 24,48 or any number dutycycle are 50% square-wave pulse count signal in per 360 °.
Microcircuit module assembly of the present invention is by the first input current-limiting resistance, the second input current-limiting resistance, first divider resistance, second divider resistance, the first output current limiting resistance, the second output current limiting resistance, first feedback resistance, second feedback resistance, first limiter diode, second limiter diode, the 3rd limiter diode, the 4th limiter diode, first voltage stabilizing diode, second voltage stabilizing diode, the 3rd voltage stabilizing diode, the 4th voltage stabilizing diode, first operational amplifier, second operational amplifier, and first trigger, second d type flip flop constitutes; The first input current-limiting resistance, the second input current-limiting resistance connect first operational amplifier, second operational amplifier input anode respectively, the first input current-limiting resistance, the second input current-limiting resistance other end are respectively two signal source input ends of signal Processing microcircuit module, connect the two group pulse signal sources that conductive plastics signal source parts produce respectively; First limiter diode, the 3rd limiter diode are oppositely and connect back one termination, first operational amplifier input anode, the other end is connected in series the pin 3 that is connected to first d type flip flop behind first feedback resistance, first operational amplifier output terminal is connected in series the pin 3 that is connected to first d type flip flop behind the first output current limiting resistance, the first divider resistance cross-over connection is in 6 on the pin of first operational amplifier input negative terminal and first d type flip flop, is connected to 6 on the pin 3 of first d type flip flop and pin after first voltage stabilizing diode, the 3rd voltage stabilizing diode differential concatenation; Second limiter diode, the 4th limiter diode oppositely and connect back one termination, second operational amplifier input anode, the other end is connected in series the pin 3 that is connected to second d type flip flop behind second feedback resistance, second operational amplifier output terminal is connected in series the pin 3 that is connected to second d type flip flop behind the second output current limiting resistance, the second divider resistance cross-over connection is in 6 on the pin of the second operational amplifier U2 input negative terminal and second d type flip flop, second voltage stabilizing diode, be connected to 6 on the pin 3 of second d type flip flop and pin after the 4th voltage stabilizing diode differential concatenation, the first d type flip flop pin 2 is connected with the second d type flip flop U4 pin 4, the first d type flip flop pin 5 is connected with the second d type flip flop pin 5, and the pin 1 of first d type flip flop and the pin 1 of second d type flip flop are as two output terminals of this sensor.
The present invention has overcome many shortcoming of above-mentioned two class sensors, deduct the required module converts device of analog signals sensor, also deducted required speed increasing mechanism and the magnet steel of digital quantity signal sensor, eliminated electromagnetic interference (EMI), simple in structure firm, convenient and flexible installation.Promptly keep characteristics such as conductive plastics sensor high life, high precision, antijamming capability be strong, directly can export the demand that digital signal satisfies modern intelligent optical, mechanical and electronic integration field TT﹠C system again.
Description of drawings
Fig. 1 is a general structure synoptic diagram of the present invention;
Fig. 2 is the outside mounting structure synoptic diagram of the present invention;
Fig. 3 is an inner structure synoptic diagram of the present invention;
Fig. 4 is a communication interface synoptic diagram of the present invention;
Fig. 5 is the scheme of installation of the present invention on TT﹠C system;
Fig. 6 is microcircuit module assembly circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the present invention is described in detail.
Embodiment
Present embodiment is made of angular displacement conductive plastics pulse counting sensor, and sensor partly is made up of conductive plastics signal source parts and signal Processing microcircuit module two.Conductive plastics signal source parts comprise: housing 1, be arranged on the first conductive plastics bar shaped code-disc 2 of inner walls, be arranged on synchronous 3 of housing upper end, be arranged on the second conductive plastics bar shaped code-disc 4 of synchronous inwall, be arranged on the clutch shaft bearing 5 of inner walls, be arranged on second bearing 6 of synchronous inwall, pass the rotating shaft sleeve member 7 of two bearings, be arranged on the brush parts 8 on the rotating shaft sleeve member, be arranged on the first spacing back-up ring 9 that is used on the rotating shaft sleeve member, be arranged on the second spacing back-up ring 10 that is used on the rotating shaft sleeve member, be arranged on the first exit parts 11 of housing side, be arranged on the second exit parts 12 of housing side, be arranged on the three terminal parts 13 of synchronous side, be arranged on the 4th exit parts 14 of synchronous side, be arranged on the lead 15 on the first exit parts of housing side, be arranged on the lead 16 on the second exit parts of housing side, be arranged on the lead 17 on the three terminal parts of synchronous side, be arranged on the lead 18 on the 4th exit parts of synchronous side; The first conductive plastics bar shaped code-disc 2, the second conductive plastics bar shaped code-disc 4 produce the square-wave pulse count signal.Signal Processing microcircuit module parts comprise: microcircuit module assembly 19, protection panel 20, be arranged at the six pin gang sockets 21 of protection on the panel 20; Anti-six anti-inserted pin gang sockets 21 are directly inserted with the communication of TT﹠C system and are connected contact pin, exempt from wire bonds, and it is easy to use again to have anti-electromagnetism interference function.Microcircuit module assembly 19 by first, second input current-limiting resistance R1, R2, first, second divider resistance R3, R4, first, second output current limiting resistance R 5, R6, first, second feedback resistance R7, R8, first to fourth limiter diode D1-D4, first to fourth voltage stabilizing diode D5-D8, first, second operational amplifier U1, U2, and first, second d type flip flop U3, U4 constitute.First, second input current-limiting resistance R1, R2 meet first, second operational amplifier U1, U2 respectively and import anode, first, second input current-limiting resistance R1, the R2 other end are respectively two signal source input ends of signal Processing microcircuit module, connect the two group pulse signal sources that conductive plastics signal source parts produce respectively; The first limiter diode D1, the 3rd limiter diode D3 are oppositely and connect back one termination, first operational amplifier U1 input anode, the other end is connected in series the pin 3 that is connected to the first d type flip flop U3 behind the first feedback resistance R7, the first operational amplifier U1 output terminal is connected in series the pin 3 that is connected to the first d type flip flop U3 after the first output current limiting resistance R 5, the first divider resistance R3 cross-over connection is in 6 on the pin of the first operational amplifier U1 input negative terminal and the first d type flip flop U3, is connected to 6 on the pin 3 of the first d type flip flop U3 and pin after the first voltage stabilizing diode D5, the 3rd voltage stabilizing diode D7 differential concatenation; The second limiter diode D2, the 4th limiter diode D4 oppositely and connect back one termination, second operational amplifier U2 input anode, the other end is connected in series the pin 3 that is connected to the second d type flip flop U4 behind the second feedback resistance R8, the second operational amplifier U2 output terminal is connected in series the pin 3 that is connected to the second d type flip flop U4 after the second output current limiting resistance R 6, the second divider resistance R4 cross-over connection is in 6 on the pin of the second operational amplifier U2 input negative terminal and the second d type flip flop U4, the second voltage stabilizing diode D6, be connected to 6 on the pin 3 of the second d type flip flop U4 and pin after the 4th voltage stabilizing diode D8 differential concatenation, the first d type flip flop U3 pin 2 is connected with the second d type flip flop U4 pin 4, and the first d type flip flop U3 pin 5 is connected with the second d type flip flop U4 pin 5.The pin 1 of the first d type flip flop U3 and the pin 1 of the second d type flip flop U4 are as two output terminals of the present invention.
Conductive plastics bar shaped code-disc in the present embodiment utilizes conductive plastics bar shaped code-disc to produce the square-wave pulse count signal as the core part of sensor.In the design, adopt nano level conductive plastics resin and conductive filler to process by die pressing by brand-new technology and prescription, under the optimum condition of temperature, time, pressure, aggregate into space network, become insoluble not molten polymkeric substance, any surface finish such as minute surface, hard wear resistant, stable performance, the reliability height.When electric current by the time, moving contact brush corresponding track on conductive plastics bar shaped code-disc minute surface conductor produces displacement with the rotation of sensor rotating shaft, by the moving contact brush just 360 degree to produce dutycycles continuously be 50% square-wave pulse count signal.Every circle can be by the square-wave pulse signal of different model requirement output 24,48 or any number.Utilize two groups of signal sources of the slip generation of conductive plastics bar shaped code-disc and brush, two groups of signal sources are transported in the microcircuit module of sensor simultaneously, one group of signal source is treated to step-by-step counting, and can produce the accumulated counts function by multi-turn.Another group signal source is treated to phase detection signal, realizes the reversible counting function.When outside TT﹠C system main frame had a power failure, sensor rested on current location, and current location possesses memory function after the recovery electricity consumption.Effective operating angle of product is 360 °/every circle, but the arbitrfary point zero clearing, no dead band.The treated advantage of signal of the all-in-one-piece sensor output of this layering with anti-electromagnetic interference (EMI).The sensor one-piece construction adopts the brand-new design theory, and the product external structure and the market demand integrate with, and satisfy installation requirement.At it end face design being installed there is the threaded hole 22 of installation, can be with sensor firmly fixedly on the installing plate 23 of TT﹠C system.The rotating shaft of sensor is Φ 6 by the industry standard size diameter, and at the installation end of rotating shaft, design has mills flat feature 24, is convenient to the effectively firm installation of shaft joint with TT﹠C system.The form and position tolerance that end face is installed guarantees vertical with the axle center of rotating shaft.
When use is of the present invention on TT﹠C system, at first the rotating axis component of sensor is inserted the shaft joint of TT﹠C system, then the installed surface of sensor and the installing plate 23 of TT﹠C system are developed, sensor is fixed on the installing plate 23, again the stop screw on the shaft joint is tightened up with 3 screws.After sensor installs, six cushion pins of TT﹠C system are inserted on six needle sockets on the protection panel 20 of sensor, then with the TT﹠C system energized, at this moment the position that shows on the TT﹠C system panel 25 is a default value 50%.When duty begins, the main shaft of actuator begins rotation, the position quantity that the signal variation of exporting according to sensor on the panel shows is respective change also, number percent increases clockwise, is 100% to the maximum, is the position full-gear, during the spindle axis counterclockwise rotation, the number percent that shows successively decreases, and minimum is 0%, is position complete shut-down state.By the debugging of TT﹠C system,, can debug out needed every circle increase and decrease percent value according to the number of turns of main axis rotation.
Claims (9)
1. a conductive plastics pulse counting sensor is characterized in that comprising: conductive plastics signal source parts and signal microcircuit module two part compositions; Conductive plastics signal source parts comprise that the first conductive plastics bar shaped code-disc and the second conductive plastics bar shaped code-disc all produce two group pulse signal sources with the slip of two groups of corresponding moving contact brush parts; The signal microcircuit module will be wherein one group of processing signals source be step-by-step counting and produce the accumulated counts function that another group processing signals source is that the impulse phase detection signal is realized the reversible counting function by multi-turn.
2. conductive plastics pulse counting sensor according to claim 1 is characterized in that: conductive plastics signal source parts comprise: housing, be arranged on the first conductive plastics bar shaped code-disc of inner walls, be arranged on the synchronous of housing upper end, be arranged on the second conductive plastics bar shaped code-disc of synchronous inwall, be arranged on the clutch shaft bearing of inner walls, be arranged on second bearing of synchronous inwall, pass the rotating shaft sleeve member of two bearings, be arranged on the brush parts on the rotating shaft sleeve member, be arranged on the first spacing back-up ring that is used on the rotating shaft sleeve member, be arranged on the second spacing back-up ring that is used on the rotating shaft sleeve member, be arranged on the first exit parts of housing side, be arranged on the second exit parts of housing side, be arranged on the three terminal parts of synchronous side, be arranged on the 4th exit parts of synchronous side, be arranged on the lead on the first exit parts of housing side, be arranged on the lead on the second exit parts of housing side, be arranged on the lead on the three terminal parts of synchronous side, be arranged on the lead on the 4th exit parts of synchronous side;
Signal Processing microcircuit module parts comprise: microcircuit module assembly, protection panel, be arranged at the gang socket of protection on the panel; Anti-six anti-inserted pin gang sockets are directly inserted with the communication of TT﹠C system and are connected contact pin.
3. conductive plastics pulse counting sensor according to claim 1 is characterized in that: effective operating angle of product is 360 °/every circle, but the arbitrfary point zero clearing, no dead band.
4. conductive plastics pulse counting sensor according to claim 1 is characterized in that: in the outer face of sensor housing, the threaded hole that is provided for installing is installed the axial line of end face perpendicular to rotating shaft.
5. conductive plastics pulse counting sensor according to claim 1 is characterized in that: the rotating shaft sleeve member that sensor stretches out is provided with mills flat feature.
6. conductive plastics pulse counting sensor according to claim 1, it is characterized in that: conductive plastics signal source parts and signal Processing microcircuit module are designed to integral structure, internal communication adopts lead on the first exit parts be arranged on the housing side, be arranged on lead on the second exit parts of housing side, be arranged on lead on the three terminal parts of synchronous side, be arranged on the 4th exit parts of synchronous side lead totally four leads connect.
7. according to claim 2 or 3 described sensors, it is characterized in that: gang socket is the anti-anti-inserted sockets of six pins.
8. according to claim 2 or 3 described conductive plastics pulse counting sensors, it is characterized in that: the two group pulse signal sources that the first conductive plastics bar shaped code-disc and the second conductive plastics bar shaped code-disc produce, continuous output 24,48 or any number dutycycle are 50% square-wave pulse count signal in per 360 °.
9. according to claim 2 or 3 described conductive plastics pulse counting sensors, it is characterized in that: the microcircuit module assembly is by the first input current-limiting resistance, the second input current-limiting resistance, first divider resistance, second divider resistance, the first output current limiting resistance, the second output current limiting resistance, first feedback resistance, second feedback resistance, first limiter diode, second limiter diode, the 3rd limiter diode, the 4th limiter diode, first voltage stabilizing diode, second voltage stabilizing diode, the 3rd voltage stabilizing diode, the 4th voltage stabilizing diode, first operational amplifier, second operational amplifier, and first trigger, second d type flip flop constitutes; The first input current-limiting resistance, the second input current-limiting resistance connect first operational amplifier, second operational amplifier input anode respectively, the first input current-limiting resistance, the second input current-limiting resistance other end are respectively two signal source input ends of signal Processing microcircuit module, connect the two group pulse signal sources that conductive plastics signal source parts produce respectively; First limiter diode, the 3rd limiter diode are oppositely and connect back one termination, first operational amplifier input anode, the other end is connected in series the pin 3 that is connected to first d type flip flop behind first feedback resistance, first operational amplifier output terminal is connected in series the pin 3 that is connected to first d type flip flop behind the first output current limiting resistance, the first divider resistance cross-over connection is in 6 on the pin of first operational amplifier input negative terminal and first d type flip flop, is connected to 6 on the pin 3 of first d type flip flop and pin after first voltage stabilizing diode, the 3rd voltage stabilizing diode differential concatenation; Second limiter diode, the 4th limiter diode oppositely and connect back one termination, second operational amplifier input anode, the other end is connected in series the pin 3 that is connected to second d type flip flop behind second feedback resistance, second operational amplifier output terminal is connected in series the pin 3 that is connected to second d type flip flop behind the second output current limiting resistance, the second divider resistance cross-over connection is in 6 on the pin of the second operational amplifier U2 input negative terminal and second d type flip flop, second voltage stabilizing diode, be connected to 6 on the pin 3 of second d type flip flop and pin after the 4th voltage stabilizing diode differential concatenation, the first d type flip flop pin 2 is connected with the second d type flip flop U4 pin 4, the first d type flip flop pin 5 is connected with the second d type flip flop pin 5, and the pin 1 of first d type flip flop and the pin 1 of second d type flip flop are as two output terminals of this sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110131570 CN102297705B (en) | 2011-05-20 | 2011-05-20 | Conductive plastic pulse counting sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110131570 CN102297705B (en) | 2011-05-20 | 2011-05-20 | Conductive plastic pulse counting sensor |
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| CN102297705A true CN102297705A (en) | 2011-12-28 |
| CN102297705B CN102297705B (en) | 2013-08-14 |
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| CN 201110131570 Expired - Fee Related CN102297705B (en) | 2011-05-20 | 2011-05-20 | Conductive plastic pulse counting sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111397641A (en) * | 2020-04-03 | 2020-07-10 | 梁均淋 | Photoelectric encoder with electronic rotating disc |
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| CN101625229A (en) * | 2009-08-18 | 2010-01-13 | 宁波市北仑机械电器有限公司 | Pointer type angular displacement sensor |
| CN101644560A (en) * | 2009-08-18 | 2010-02-10 | 宁波市北仑机械电器有限公司 | Angle displacement sensor for conductive plastic center tap |
| CN201532184U (en) * | 2009-07-17 | 2010-07-21 | 江西天河传感器科技有限公司 | Angular displacement conductive plastic frequency output sensor |
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2011
- 2011-05-20 CN CN 201110131570 patent/CN102297705B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06273193A (en) * | 1993-03-24 | 1994-09-30 | Seiko Epson Corp | Contact type rotary encoder |
| CN101354233A (en) * | 2008-08-04 | 2009-01-28 | 宁波市北仑机械电器有限公司 | Integrated multi-angle sensor |
| CN201364138Y (en) * | 2009-01-14 | 2009-12-16 | 江西天河传感器科技有限公司 | Angular displacement conductive plastic standard current output sensor |
| CN101561246A (en) * | 2009-04-03 | 2009-10-21 | 俞志根 | Double-track two-point output angular displacement sensor without moving contact output |
| CN201532184U (en) * | 2009-07-17 | 2010-07-21 | 江西天河传感器科技有限公司 | Angular displacement conductive plastic frequency output sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111397641A (en) * | 2020-04-03 | 2020-07-10 | 梁均淋 | Photoelectric encoder with electronic rotating disc |
| CN111397641B (en) * | 2020-04-03 | 2021-05-04 | 新昌县鸿吉电子科技有限公司 | Photoelectric encoder with electronic rotating disc |
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