CN110243401A - The decoding apparatus of the photocell of optical encoder and optomagnetic encoder - Google Patents
The decoding apparatus of the photocell of optical encoder and optomagnetic encoder Download PDFInfo
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- CN110243401A CN110243401A CN201910683237.7A CN201910683237A CN110243401A CN 110243401 A CN110243401 A CN 110243401A CN 201910683237 A CN201910683237 A CN 201910683237A CN 110243401 A CN110243401 A CN 110243401A
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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
- G01D5/54—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 using means specified in two or more of groups G01D5/02, G01D5/12, G01D5/26, G01D5/42, and G01D5/48
- G01D5/56—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 using means specified in two or more of groups G01D5/02, G01D5/12, G01D5/26, G01D5/42, and G01D5/48 using electric or magnetic means
Abstract
The invention discloses a kind of photocell of optical encoder, amplifier Single-end output circuit and comparator circuit are at least integrated in photocell；And the forward and reverse sinusoidal signal and forward and reverse cosine signal that are generated based on optical signal are handled by amplifier Single-end output circuit and comparator respectively, so that photocell can directly export sinusoidal signal, cosine signal, sinusoidal digital signal and cosine digital signal；It can also be exported at the same time without amplifier Single-end output circuit and the positive sinusoidal signal of comparator processing, reversed sinusoidal signal, positive cosine signal, reversed cosine signal.Photocell in the application realizes the various processing to cosine and sine signal, reduces the quantity for connecting circuit between photocell and processor, and then simplify the circuit structure on wiring board, is conducive to the miniaturized application of encoder.The present invention also provides a kind of decoding apparatus of optomagnetic encoder, have above-mentioned beneficial effect.
Description
Technical field
The present invention relates to code device signal processing technology fields, photocell more particularly to a kind of optical encoder and optomagnetic
The decoding apparatus of encoder.
Background technique
Encoder is a kind of device for angular displacement or straight-line displacement being converted into electric signal, mainly by light-sensitive element,
Rotation of the induction component detection such as magnetic induction sensor or inductance component with rotary shaft, the variation of light, magnetic or electric signal,
And the displacement of rotation is determined based on this variation.
Optical signal, magnetic signal, electric signal are being carried out to need the circuit chip using various loads in processing operation,
Require the chip part for needing to be arranged on the wiring board of encoder more.So that the chip complex circuit on wiring board.
Summary of the invention
The object of the present invention is to provide a kind of photocell of optical encoder and a kind of decoding apparatus of optomagnetic hybrid coder,
Simplify the structure of the circuit element of decoder internal, the reasonable miniaturization in encoder.
In order to solve the above technical problems, the present invention provides a kind of photocell of optical encoder, the photocell is for receiving
The optical signal that light source is sent by code channel, and positive sinusoidal signal, reversed sinusoidal signal are generated, more than forward direction according to the optical signal
String signal, reversed cosine signal；
Amplifier Single-end output circuit and comparator circuit are at least integrated in the photocell；
The photocell includes sinusoidal signal output port, positive sinusoidal signal output port, the output of reversed sinusoidal signal
Port, sinusoidal digital signal output end mouth, cosine signal output port, positive cosine signal output port, reversed cosine signal
Output port and cosine digital signal output port；
Wherein, the amplifier Single-end output circuit is used to carry out the positive sinusoidal signal and the reversed sinusoidal signal
Processing, and sinusoidal signal is exported by the sinusoidal signal output port；It is also used to the positive cosine signal and described anti-
Cosine signal is exported to cosine signal, and by the cosine signal output port；
The comparator circuit is used to handle the positive sinusoidal signal and the reversed sinusoidal signal, and passes through
The sine digital signal output end mouth exports sinusoidal digital signal；It is also used to the positive cosine signal and described reversed remaining
String signal, and cosine digital signal is exported by the cosine digital signal output port；
The forward direction sinusoidal signal output port, the reversed sinusoidal signal output port, the positive cosine signal are defeated
Exit port, the reversed cosine signal output port are respectively used to export positive sinusoidal signal, reversed sinusoidal signal, positive cosine
Signal and reversed cosine signal.
Wherein, the sinusoidal signal output port includes primary key road sinusoidal signal output port, the output of segment encode sinusoidal signal
Port and vernier code sinusoidal signal output port；
The forward direction sinusoidal signal output port, the reversed sinusoidal signal output port are respectively the positive sinusoidal letter of primary key
Number output port, the reversed sinusoidal signal output port of primary key；
The sine digital signal output end mouth includes primary key sine digital signal output end mouth, segment encode sine digital signal
Output port, vernier code sine digital signal output end mouth；
The cosine signal output port include primary key road cosine signal output port, segment encode cosine signal output port with
And vernier code cosine signal output port；
The forward direction cosine signal output port, the reversed cosine signal output port are respectively primary key forward direction cosine letter
Number output port, the reversed cosine signal output port of primary key；
The cosine digital signal output port includes primary key cosine digital signal output port, segment encode cosine digital signal
Output port, vernier code cosine digital signal output port.
Wherein, the photocell is also integrated with two amplifier difference channels；
Wherein, an amplifier difference channel is respectively used to generate primary key forward direction sinusoidal signal to according to the optical signal
It is handled with the reversed sinusoidal signal of primary key, and defeated by the positive sinusoidal signal output port, the reversed sinusoidal signal
Exit port exports the primary key difference forward direction sinusoidal signal after calculus of differences and the reversed sinusoidal signal of primary key difference respectively；
Another described amplifier difference channel is used to generate primary key forward direction cosine signal and primary key to according to the optical signal
Reversed cosine signal is handled, and passes through the positive cosine signal output port, the reversed cosine signal output port
The primary key difference forward direction cosine signal after calculus of differences and the reversed cosine signal of primary key difference are exported respectively.
The present invention also provides a kind of decoding apparatus of optomagnetic encoder, including as above described in any item photocells, place
Manage device, magnetic field induction chip；
The processor is used for and the photronic sinusoidal signal output port, positive sinusoidal signal output port, anti-
To sinusoidal signal output port, sinusoidal digital signal output end mouth, cosine signal output port, positive cosine signal output end
Mouth, reversed cosine signal output port and cosine digital signal output port are connected, and are connected with the magnetic induction chip
It connects, the resolving of absolute position is carried out according to the photronic output signal and the output signal of the magnetic induction chip.
Wherein, the photronic primary key forward direction sinusoidal signal output port and the reversed sinusoidal signal output port of primary key,
Primary key forward direction cosine signal output port and the reversed cosine signal output port of primary key pass through respectively two external difference channels and
The processor is connected.
Wherein, the magnetic field induction chip includes the second magnetic strength of the center of the magnet steel set on the optomagnetic encoder of face
The orthogonal first magnetic strength chip of two of magnet steel marginal position described in chip and face.
Wherein, the output port of the second magnetic strength chip is connected by external difference channel with the processor.
Wherein, the first magnetic induction chip be AMR chip, the second magnetic strength chip be TMR chip, GMR chip,
Any one in AMR chip or the first magnetic strength chip.
The photocell of optical encoder provided by the present invention, be at least integrated in photocell amplifier Single-end output circuit and
Comparator circuit；And respectively by amplifier Single-end output circuit and comparator to the sinusoidal letter of the forward direction generated based on optical signal
Number, reversed sinusoidal signal, positive cosine signal, reversed cosine signal handled so that photocell can directly export sinusoidal letter
Number, cosine signal, sinusoidal digital signal and cosine digital signal；It can also be exported at the same time without amplifier Single-end output electricity
The positive sinusoidal signal of road and comparator processing, reversed sinusoidal signal, positive cosine signal, reversed cosine signal.
Photocell in the application, exportable sinusoidal signal, cosine signal, sinusoidal digital signal and cosine digital signal,
The signals such as positive sinusoidal signal, reversed sinusoidal signal, positive cosine signal, reversed cosine signal, realize to cosine and sine signal
Various processing, simplify in subsequent absolute position solution process to photocell output signal treatment process, reduce photoelectricity
The quantity of circuit is connected between pond and processor, and then simplifies the circuit structure on wiring board, is conducive to the miniaturization of encoder
Using.
The present invention also provides a kind of decoding apparatus of optomagnetic encoder, have above-mentioned beneficial effect.
Detailed description of the invention
It, below will be to embodiment or existing for the clearer technical solution for illustrating the embodiment of the present invention or the prior art
Attached drawing needed in technical description is briefly described, it should be apparent that, the accompanying drawings in the following description is only this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is photronic circuit frame schematic diagram provided in an embodiment of the present invention；
Fig. 2 is the structural block diagram of the decoding apparatus of optomagnetic encoder provided in an embodiment of the present invention；
Fig. 3 is the attachment structure schematic diagram of photocell provided in an embodiment of the present invention and processor；
Fig. 4 is the structural schematic diagram of magnetic encoding pack in optomagnetic encoder provided in an embodiment of the present invention；
Fig. 5 is the attachment structure schematic diagram of processor provided in an embodiment of the present invention and magnetic induction chip.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.Obviously, described embodiments are only a part of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
As shown in FIG. 1, FIG. 1 is photronic circuit frame schematic diagrames provided in an embodiment of the present invention.The photocell is specific
May include:
Photocell 10 generates positive sinusoidal letter for receiving the optical signal that light source is sent by code channel, and according to optical signal
Number, reversed sinusoidal signal, positive cosine signal, reversed cosine signal；It is characterized in that, being at least integrated with amplifier in photocell 10
Single-end output circuit 11 and comparator circuit 12；
Photocell 10 includes sinusoidal signal output port, positive sinusoidal signal output port, reversed sinusoidal signal output end
Mouth, sinusoidal digital signal output end mouth, cosine signal output port, positive cosine signal output port, reversed cosine signal are defeated
Exit port and cosine digital signal output port；
Wherein, amplifier Single-end output circuit 11 is for handling positive sinusoidal signal and reversed sinusoidal signal, and leads to
Cross sinusoidal signal output port output sinusoidal signal；It is also used to positive cosine signal and reversed cosine signal, and passes through cosine
Signal output port exports cosine signal；
Comparator circuit 12 passes through sinusoidal number letter for handling positive sinusoidal signal and reversed sinusoidal signal
Number output port exports sinusoidal digital signal；It is also used to positive cosine signal and reversed cosine signal, and passes through cosine digital
Signal output port exports cosine digital signal；
It is positive sinusoidal signal output port, reversed sinusoidal signal output port, positive cosine signal output port, reversed remaining
String signal output port is respectively used to export positive sinusoidal signal, reversed sinusoidal signal, positive cosine signal and reversed cosine
Signal.
The light penetrated by the code channel of code-disc is received in photocell 10, can correspondingly generate analog signal, namely
It is that positive sinusoidal signal, reversed sinusoidal signal, positive cosine signal, reversed cosine signal can use sin as shown in fig. 1 respectively
+, sin-, cos+, cos- indicate.
Conventional photocell, can be directly by the analog signal output after generating four kinds of analog signals.But according to the light
The signal of battery output resolve the processor of absolute position, can not be resolved directly against the analog signal, therefore
With regard to needing to increase corresponding circuit element between photocell and processor, for carrying out a variety of different operations to simulation model
Processing.And the circuit element and photocell and processor are set in the wiring board of encoder, and the area of wiring board has
Limit, and if higher to the required precision of the absolute position of processor resolving, the intermediate circuit handled analog signal is first
Part is also more complicated, also just requires the area of wiring board bigger accordingly, and then the volume of encoder is also bigger, does not meet row
In the industry to the application demand of encoder miniaturization.
For this purpose, amplifier Single-end output circuit 11 and comparator circuit 12 will be integrated in the application in photocell 10.Amplifier
Single-end output circuit 11 is equivalent to an amplifying circuit, can export one just according to positive sinusoidal signal and reversed sinusoidal signal
String signal, the sinusoidal signal are equivalent to the signal that the amplitude of positive sinusoidal signal is expanded 2 times and is obtained.Similarly, for logical
Cross the cosine signal and positive cosine signal also corresponding relationship having the same of the output of amplifier Single-end output circuit 11.
It is already existing circuit structure in the prior art, in the present embodiment only for amplifier Single-end output circuit 11
It is only this circuit structure to be integrated in photocell, therefore to it, specifically circuit structure is not illustrated in the application.
Comparator circuit 12 is mainly to export positive chord number by comparing the size of positive sinusoidal signal and reversed sinusoidal signal
Word signal；Similarly preparatory digital signal is also to obtain by comparing positive cosine signal and reversed cosine signal.For comparing
Device circuit 12 is specifically a comparator, is current using a kind of more universal circuit element, is no longer described in detail herein.
It should be noted that being needed in the application respectively to positive sinusoidal signal, reversed sinusoidal signal, positive cosine letter
Number, reversed cosine signal handled；In actual circuit, it needs to be total to for each group of forward direction sinusoidal signal and reversed sinusoidal signal
With one amplifier Single-end output circuit of configuration and a comparator circuit；And each group of forward direction cosine signal and reversed cosine signal
One amplifier Single-end output circuit 11 of configuration and a comparator circuit 12 jointly；In other words for forward and reverse sinusoidal signal and
The amplifier Single-end output circuit 11 and comparator circuit 12 of forward and reverse cosine signal are not shared.
In addition, in order to improve the calculation accuracy of absolute position, processor needs to obtain analog signal, therefore this Shen toward contact
Please in photocell 10 exporting after amplifier Single-end output circuit 11 and comparator circuit 12 treated photosignal,
The analog signals such as positive sinusoidal signal, reversed sinusoidal signal, positive cosine signal, reversed cosine signal are exported, also to meet place
Manage the different resolving demand of device.
To sum up, amplifier Single-end output circuit 11 and comparator circuit 12 are integrated in the application in photocell 10, one
Determine to improve photocell 10 in degree to the calculation processing power of signal, and then reduces between processor and photocell 101
Circuit element simplifies the circuit element point on wiring board on the basis of guaranteeing that processor high precision solution calculates absolute position
Cloth structure meets the development trend of encoder miniaturization.
In order to be further illustrated to technical solution of the present invention, below for the vernier code with three circle channel
It is illustrated for the photocell of the optical signal in road.Specifically, Fig. 1 can be referred to, the photocell in Fig. 1 is to be directed to vernier code
The chip structure block diagram arrived.
Specifically, in a specific embodiment of the invention, may include:
Amplifier Single-end output circuit 11 and six comparator circuits 12 there are six being integrated in photocell 10；
Sinusoidal signal output port includes primary key road sinusoidal signal output port, segment encode sinusoidal signal output port and trip
Coding sinusoidal signal output port；
Positive sinusoidal signal output port, reversed sinusoidal signal output port are respectively primary key forward direction sinusoidal signal output end
Mouth, the reversed sinusoidal signal output port of primary key；
Sinusoidal digital signal output end mouth includes primary key sine digital signal output end mouth, the output of segment encode sine digital signal
Port, vernier code sine digital signal output end mouth；
Cosine signal output port includes primary key road cosine signal output port, segment encode cosine signal output port and trip
Coding cosine signal output port；
Positive cosine signal output port, reversed cosine signal output port are respectively primary key forward direction cosine signal output end
Mouth, the reversed cosine signal output port of primary key；
Cosine digital signal output port includes primary key cosine digital signal output port, the output of segment encode cosine digital signal
Port, vernier code cosine digital signal output port
It should be noted that vernier code channel includes primary key road M, segment encode road N and vernier code channel S.
It wherein, include primary key M_sin+ (i.e. primary key forward direction sinusoidal signal), primary key M_ according to the signal that primary key road M is generated
Sin- (i.e. the reversed sinusoidal signal of primary key), primary key M_cos+ (i.e. primary key forward direction cosine signal), (i.e. primary key is reversed by primary key M_cos-
Cosine signal)；
It similarly, include segment encode N_sin+, segment encode N_sin-, segment encode N_cos+, segment encode according to the signal that segment encode road N is generated
N_cos-；
It include vernier code S_sin+, vernier code S_sin-, vernier code S_cos+, trip according to the signal that vernier code channel S is generated
Coding S_cos-.
Wherein, processor needs the analog signal primary key M_sin according to primary key road M when being resolved according to photocell
+, primary key M_sin-, primary key M_cos+ and primary key M_cos- calculate the higher groove phase angle of accuracy；Without using
The analog signal of segment encode road N and vernier code channel S.Therefore, in the output port of photocell 10, for primary key road M signal it is defeated
Exit port just includes that primary key sinusoidal signal port output M_sin, primary key forward direction sinusoidal signal port output M_sin+, primary key are reversed
Sinusoidal signal port exports M_sin- and primary key cosine digital signal port exports M_sin_Pulse；Correspondingly preliminary signal
It is also that corresponding four output ports export four signals, as the specific port way of output with reference to Fig. 1 and sine to induction signal
Correlation output mode, details are not described herein.
And segment encode sinusoidal signal output port is only needed to export N_sin (i.e. segment encode sinusoidal signal), segment encode for segment encode road N
Sinusoidal digital signal output end mouth exports N_sin_Pulse (i.e. segment encode sine digital signal), segment encode cosine signal output port
Export N_cos (i.e. segment encode cosine signal), segment encode cosine digital signal output port exports N_cos_Pulse (i.e. segment encode cosine
Digital signal)；Similarly, it only needs for vernier code channel S for exporting vernier code S_sin, vernier code S_sin_Pulse, trip
The port of coding S_cos, vernier code S_cos_Pulse, this will not be repeated here.
In addition, according to Fig. 1 in photocell 10, for every a pair of forward and reverse sinusoidal signal generated according to optical signal and
Every a pair of forward and reverse cosine signal generated according to optical signal is required to that an amplifier Single-end output circuit 11 and ratio is respectively configured
Compared with device circuit 12.Therefore, it is integrated with 6 amplifier Single-end output circuits 11 in photocell 10 and 6 comparator circuits 12 are right respectively
Forward and reverse sinusoidal signal of primary key road M, forward and reverse cosine signal of primary key road M, forward and reverse sinusoidal signal of segment encode road N, segment encode
Forward and reverse cosine signal of road N, forward and reverse sinusoidal signal of vernier code channel S, six pairs of forward and reverse cosine signal of vernier code channel S letters
It number is handled.
As before, processor according to the output signal of photocell 10 resolve absolute position when, if to the accurate of calculation result
It spends more demanding, it is necessary to obtain the moulds such as the primary key M_sin+ in primary key road, primary key M_sin-, primary key M_cos+, primary key M_cos-
Quasi- signal.But processor can not directly resolve this four signals, it is also necessary to by difference channel to this four moulds
After quasi- signal carries out calculus of differences, processor just can be carried out calculus of differences, in other words need between processor and photocell
Configure difference channel.In order to be further simplified the application middle circuit element structure, in another specific embodiment of the invention
In, can also further include:
Photocell 10 is also integrated with two amplifier difference channels 13；
One amplifier difference channel 13 is respectively used to reversed according to optical signal generation primary key forward direction sinusoidal signal and primary key
Sinusoidal signal is handled, and exports process respectively by positive sinusoidal signal output port, reversed sinusoidal signal output port
Primary key difference forward direction sinusoidal signal and the reversed sinusoidal signal of primary key difference after calculus of differences；
Another described amplifier difference channel generates primary key forward direction cosine signal and the reversed cosine of primary key to according to optical signal
Signal is handled, and is exported respectively by positive cosine signal output port, reversed cosine signal output port by difference
Primary key difference forward direction cosine signal and the reversed cosine signal of primary key difference after operation.
Specifically, as shown in Figure 1, being integrated with two amplifier difference channels 13 in photocell 10, respectively to primary key forward direction
Sinusoidal signal and the reversed sinusoidal signal of primary key, positive cosine signal and primary key two groups of signals of reversed cosine signal are handled.
Certainly it should be noted that can integrate amplifier difference channel 13 in photocell 10 in the present invention can not also
Integrated transporting discharging difference channel 13.It is positive sinusoidal signal output port, anti-if non-integrated transporting discharging difference channel 13 in photocell 10
Can directly it divide to sinusoidal signal output port, positive cosine signal output port and reversed cosine signal output port
It Shu Chu not be according to analog signals such as primary key M_sin+, primary key M_sin-, primary key M_cos+, the primary key M_cos- that optical signal generates；
If being integrated with amplifier difference channel 13 in photocell, the primary key M_sin+, the primary key M_sin-, primary key that are generated according to optical signal
After the analog signals such as M_cos+, primary key M_cos- just need to first pass through the processing of amplifier difference channel 13, then respectively from positive sinusoidal
Signal output port, reversed sinusoidal signal output port, positive cosine signal output port and reversed cosine signal output end
Mouth just exports.
Integrated transporting discharging difference channel 13 in photocell 10 is one of the application preferred embodiment, in the present invention
Photocell 10 is also possible to the chip of not integrated transporting discharging difference channel 13, in this regard, also having no effect on technical solution in the present invention
It realizes, therefore two kinds of embodiments should belong to the protection scope of the application.
A kind of decoding apparatus of optomagnetic encoder is additionally provided in the present invention, as shown in Fig. 2, Fig. 2 is the embodiment of the present invention
The structural block diagram of the decoding apparatus of the optomagnetic encoder provided.The decoding apparatus may include:
Photocell 10, processor 20, magnetic field induction chip 30 described in any embodiment as above；
Processor 30 is used for and photronic sinusoidal signal output port, positive sinusoidal signal output port, reversed sine
It is signal output port, sinusoidal digital signal output end mouth, cosine signal output port, positive cosine signal output port, reversed
Cosine signal output port and cosine digital signal output port are connected, and are connected with magnetic induction chip 30, according to light
The output signal of battery 10 and the output signal of magnetic induction chip 30 carry out the resolving of absolute position.
For optomagnetic hybrid coder, not only had the advantages that antipollution, the strong interference immunity of magnetic coder, but also have
Optical encoder measures accurately to high advantage.But for pure optical encoder, photoelectricity hybrid coder there is also
The corresponding circuit element of magnetic coder, further such that the circuit element on wiring board increases.For this purpose, being used in this reality embodiment
It is at least integrated with the photocell 10 of amplifier Single-end output circuit 11 and comparator circuit 12, is conducive to the circuit elements of optomagnetic encoder
The simplification of part, to solve in optomagnetic encoder, circuit element quantity is more, is laid out complicated problem, is conducive to optomagnetic coding
The extensive use of device.
Optionally, in another embodiment of the present invention, can also further include:
The reversed sinusoidal signal output port of primary key forward direction sinusoidal signal output port and primary key, the primary key of photocell 10 are positive
Cosine signal output port and the reversed cosine signal output port of primary key pass through two external difference channels 40 and processor respectively
20 are connected.
For the connection relationship between photocell 10 and processor 20, Fig. 3 can refer to, Fig. 3 provides for the embodiment of the present invention
Photocell and processor attachment structure schematic diagram.
It should be noted that the photocell 10 in Fig. 3 is in the encoder applied to vernier code channel, because of entire circuit diagram
Output port is more, and sinusoidal signal output port, the sinusoidal digital signal output end mouth, cosine of primary key road M are eliminated in Fig. 3
Signal output port, cosine digital signal output port, in practical applications, be there may be this four output ports, and
Four ports are also directly to be connected with processor 20.
Specifically, as shown in figure 3, primary key forward direction sinusoidal signal output port and the reversed sinusoidal signal output port of primary key are total
With one external difference channel of connection, and primary key forward direction cosine signal output port and the reversed cosine signal output port of primary key are total
With one external difference channel 40 of connection.
As before, being directed in the embodiment that photoelectricity code channel is vernier code channel, resolved in the signal exported according to photocell 10 exhausted
When to position, to calculate the higher analog signal for needing to obtain primary key road M of accuracy, i.e. primary key M_sin+, primary key M_
Sin-, primary key M_cos+, primary key M_cos-.And for the photocell 10 for not being built-in with amplifier difference channel 13, it is also necessary to
Configuration difference channel is input to processor 20 after handling the analog signal again, that is to say configuration connection photocell 10 and place
Manage the external difference channel 40 of device 20.
It should be noted that the amplifier difference channel 13 being integrated in photocell 10 and external difference channel in the application
40 function is identical, thus its circuit structure be also it is identical and approximate, the tune of adaptability can be done according to practical application
It is whole, but its basic principle of circuit can be identical.
But for the photocell 10 for being built-in with amplifier difference channel 13, it is understood that there may be because of such as calculus of differences
Amplification factor and circuit in various parameters setting difference and other reasons, cause the amplifier differential electrical integrated in photocell 10
The calculus of differences demand of requirement and processor 20 resolving needs of the road 13 to the calculus of differences of the analog signal of primary key road M is simultaneously different
It causes.It therefore, in this case, can also be between the analog signal output mouth and processing 20 of the primary key road M of photocell 10
One external difference channel 40 is set, to meet operation demand.
Certainly, the analog signal of the primary key road M exported for amplifier difference channel 13 built-in in photocell 10, and if
The signal that processor 20 resolves needs is consistent, then each output of photocell 10 can be directly connected to processor 20, without logical
External difference channel 40 is crossed to connect.
Optionally, in another embodiment of the present invention, can also further include:
Magnetic field induction chip 30 includes the first magnetic strength chip 31 of the center of the magnet steel set on the optomagnetic encoder of face
The orthogonal second magnetic strength chip 32 with two of face magnet steel marginal position.
It specifically, is AMR chip for the first magnetic induction chip, the second magnetic strength chip is TMR chip, GMR chip, AMR
Any one in chip or the first magnetic strength chip.Certainly it is also not precluded using other in the present invention with similar functions core
The embodiment of piece.
As shown in figure 4, Fig. 4 is the structural schematic diagram of magnetic encoding pack in optomagnetic encoder provided in an embodiment of the present invention.
Magnet steel is ring magnet in Fig. 4, is made of the semicircle pole N and the semicircle pole S, and AMR chip 31 is set to the Pivot axle of magnet steel
On, two Hall chips are arranged in magnet steel marginal position, and measurement direction, two Hall cores parallel with the tangential direction of magnet steel
The measurement direction of piece is mutually perpendicular to, and then realizes the orthogonal measuring of the two.Wherein, Fig. 4 is with AMR chip for the first magnetic strength chip
31, Hall chip is what the second magnetic strength chip 32 was indicated, is repeated no more to this.
In addition, magnet steel is for each revolution, two Hall chips respectively export the square-wave signal of a cycle, and two square wave letters
Number difference 90 degree；
AMR chip often rotates a circle for magnet steel, exports the sinusoidal signal and the cosine signal in two periods in two periods.
If circular magnet steel to be divided into four 90 degree of fan-shaped region, then current absolute location is in different sectors
Region is that there are different combinations for the low and high level of two the second magnetic strength chips 32 output；Correspondingly, according to two the second magnetic strengths
The different combination of the low and high level that chip 32 exports can determine which of the first magnetic strength chip 31 output current location correspond to
The cosine and sine signal in a period, and then calculate absolute position values.
Although the first magnetic strength chip 31 can also only export the cosine and sine signal of a cycle when magnet steel is revolved and turned around,
And changes of magnetic field is detected without the second magnetic strength chip 32 at this time, it can calculate absolute position, but this resolving mode
The precision of the absolute position calculated is lower.Therefore, two the second magnetic strength chips 32 and first magnetic are used in the present embodiment
Sense chip 31 combines, and is a kind of preferred embodiment.
Optionally, in another embodiment of the present invention, can also further include:
The output port of first magnetic strength chip 31 is connected by external difference channel 40 with processor 20.
Specifically, as shown in figure 5, Fig. 5 is the connection structure of processor provided in an embodiment of the present invention and magnetic induction chip
Schematic diagram.
Because of the output of the first magnetic strength chip 31 and sine and cosine analog signal, in order to which processor 20 can solve
More accurate absolute position is calculated, needs that external difference channel 40 is arranged between the first magnetic strength chip 31 and processor 20 again,
Certainly, the external difference channel 40 in the application also can integrate in the first magnetic strength chip 31, have in this regard, not doing in the present invention
Body limits.
As shown in Figure 3 and Figure 5, the external difference channel 40 and photocell between the first magnetic strength chip 31 and processor 20
The circuit structure of the 10 external difference channel 40 between processor 20 is identical, can be according to reality as specifically circuit parameter
The selection of border situation.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with it is other
The difference of embodiment, same or similar part may refer to each other between each embodiment.For being filled disclosed in embodiment
For setting, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part
Explanation.
Claims (8)
1. a kind of photocell of optical encoder, the photocell for receiving the optical signal that light source is sent by code channel, and according to
The optical signal generates positive sinusoidal signal, reversed sinusoidal signal, positive cosine signal, reversed cosine signal；It is characterized in that,
Amplifier Single-end output circuit and comparator circuit are at least integrated in the photocell；
The photocell include sinusoidal signal output port, positive sinusoidal signal output port, reversed sinusoidal signal output port,
Sinusoidal digital signal output end mouth, cosine signal output port, positive cosine signal output port, reversed cosine signal output end
Mouth and cosine digital signal output port；
Wherein, the amplifier Single-end output circuit is used for at the positive sinusoidal signal and the reversed sinusoidal signal
Reason, and sinusoidal signal is exported by the sinusoidal signal output port；It is also used to the positive cosine signal and described reversed
Cosine signal, and cosine signal is exported by the cosine signal output port；
The comparator circuit is used to handle the positive sinusoidal signal and the reversed sinusoidal signal, and by described
Sinusoidal digital signal output end mouth exports sinusoidal digital signal；It is also used to the positive cosine signal and the reversed cosine letter
Number, and cosine digital signal is exported by the cosine digital signal output port；
The forward direction sinusoidal signal output port, the reversed sinusoidal signal output port, the positive cosine signal output end
Mouth, the reversed cosine signal output port are respectively used to export positive sinusoidal signal, reversed sinusoidal signal, positive cosine signal
And reversed cosine signal.
2. the photocell of optical encoder as described in claim 1, which is characterized in that the sinusoidal signal output port includes master
Code channel sinusoidal signal output port, segment encode sinusoidal signal output port and vernier code sinusoidal signal output port；
The forward direction sinusoidal signal output port, the reversed sinusoidal signal output port are respectively that primary key forward direction sinusoidal signal is defeated
The reversed sinusoidal signal output port of exit port, primary key；
The sine digital signal output end mouth includes primary key sine digital signal output end mouth, the output of segment encode sine digital signal
Port, vernier code sine digital signal output end mouth；
The cosine signal output port includes primary key road cosine signal output port, segment encode cosine signal output port and trip
Coding cosine signal output port；
The forward direction cosine signal output port, the reversed cosine signal output port are respectively that primary key forward direction cosine signal is defeated
The reversed cosine signal output port of exit port, primary key；
The cosine digital signal output port includes primary key cosine digital signal output port, the output of segment encode cosine digital signal
Port, vernier code cosine digital signal output port.
3. the photocell of optical encoder as claimed in claim 2, which is characterized in that the photocell is also integrated with two amplifiers
Difference channel；
Wherein, an amplifier difference channel is respectively used to generate primary key forward direction sinusoidal signal and master to according to the optical signal
The reversed sinusoidal signal of code is handled, and passes through the positive sinusoidal signal output port, the reversed sinusoidal signal output end
Mouth exports the primary key difference forward direction sinusoidal signal after calculus of differences and the reversed sinusoidal signal of primary key difference respectively；
Another described amplifier difference channel is used for reversed according to optical signal generation primary key forward direction cosine signal and primary key
Cosine signal is handled, and passes through the positive cosine signal output port, the reversed cosine signal output port difference
Export primary key difference forward direction cosine signal and the reversed cosine signal of primary key difference after calculus of differences.
4. a kind of decoding apparatus of optomagnetic encoder, which is characterized in that including photoelectricity as described in any one of claims 1 to 3
Pond, processor, magnetic field induction chip；
The processor is used for and the photronic sinusoidal signal output port, positive sinusoidal signal output port, it is reversed just
It is string signal output port, sinusoidal digital signal output end mouth, cosine signal output port, positive cosine signal output port, anti-
It is connected to cosine signal output port and cosine digital signal output port, and is connected with the magnetic induction chip, root
The resolving of absolute position is carried out according to the photronic output signal and the output signal of the magnetic induction chip.
5. the decoding apparatus of optomagnetic encoder as claimed in claim 4, which is characterized in that the photronic primary key forward direction is just
String signal output port and the reversed sinusoidal signal output port of primary key, primary key forward direction cosine signal output port and primary key are reversely remaining
String signal output port passes through two external difference channels respectively and is connected with the processor.
6. the decoding apparatus of optomagnetic encoder as claimed in claim 4, which is characterized in that the magnetic field induction chip includes setting
Two of the magnet steel marginal position described in the one the second magnetic strength chips and face of the center of the magnet steel of the optomagnetic encoder of face
A orthogonal second magnetic strength chip.
7. the decoding apparatus of optomagnetic encoder as claimed in claim 6, which is characterized in that the output of the second magnetic strength chip
Port is connected by external difference channel with the processor.
8. the decoding apparatus of optomagnetic encoder as claimed in claim 6, which is characterized in that the first magnetic induction chip is
AMR chip, the second magnetic strength chip are any one in TMR chip, GMR chip, AMR chip or the first magnetic strength chip
Kind.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910683237.7A CN110243401B (en) | 2019-07-26 | 2019-07-26 | Photoelectric cell of optical encoder and decoding device of optical magnetic encoder |
| PCT/CN2019/102987 WO2021017073A1 (en) | 2019-07-26 | 2019-08-28 | Photocell for optical encoder and decoding apparatus for optical magnetic encoder |
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| CN201910683237.7A CN110243401B (en) | 2019-07-26 | 2019-07-26 | Photoelectric cell of optical encoder and decoding device of optical magnetic encoder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114413941A (en) * | 2021-12-29 | 2022-04-29 | 歌尔光学科技有限公司 | Photocell detection system, code control method, processing chip, device, and medium |
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2019
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| JPH0829201A (en) * | 1994-07-18 | 1996-02-02 | Nikon Corp | Multirotation absolute encoder |
| JPH08249788A (en) * | 1995-03-10 | 1996-09-27 | Sony Corp | Recording/reproducing device |
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| WO2021017073A1 (en) | 2021-02-04 |
| CN110243401B (en) | 2020-05-29 |
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