CN107091655A - A kind of absolute optical encoder code-disc and absolute optical encoder - Google Patents
A kind of absolute optical encoder code-disc and absolute optical encoder Download PDFInfo
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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
- G01D5/347—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 using displacement encoding scales
- G01D5/34707—Scales; Discs, e.g. fixation, fabrication, compensation
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- 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
- G01D5/347—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 using displacement encoding scales
- G01D5/34776—Absolute encoders with analogue or digital scales
- G01D5/34792—Absolute encoders with analogue or digital scales with only digital scales or both digital and incremental scales
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Abstract
The embodiments of the invention provide a kind of absolute optical encoder code-disc and absolute optical encoder, the openwork part of code-disc is reduced on the basis of traditional Gray code metal code disk, increase the mechanical strength of code-disc, reduce the malformation of code-disc, further improve the precision of encoder, it is suitably applied in oscillation intensity big, the more severe occasion of environment.
Description
Technical field
The present invention relates to photoelectric encoder technical field, and in particular to a kind of absolute optical encoder code-disc and absolute type
Photoelectric encoder.
Background technology
Optical electric axial angle encoder, also known as Photoelectric angular position sensor, are a kind of to integrate light, mechanical, electrical precision digital
Angle-measuring equipment.Absolute type encoder is the sensor of direct output digital quantity, radially there is some on its circular code wheel
It is made up of on concentric code channel, every code channel printing opacity and lighttight fan-shaped interval, the number of sectors of adjacent code channel is double relation,
Code channel number on code-disc is exactly the digit of its binary numeral.It is light source in the side of code-disc, another-each code channel of side correspondence
There is a light-sensitive element, each light source and light-sensitive element pairing are referred to as a reading head.When code-disc is in diverse location, each light
Whether quick element changes out corresponding low and high level signal according to by illumination, forms corresponding output code, and high level is designated as 1, low
Level is designated as 0.The characteristics of this encoder be can all be read in the optional position of rotating shaft one it is fixed corresponding with position
Digital code.
Code-disc is the core parts that absolute photoelectric shaft encoder carries out data acquisition, and conventional code-disc material is glass
Glass, but glass code-disc can not adapt to vibrate, impact larger adverse circumstances, vibrating, impacting in larger adverse circumstances often
The substrate for making metal code disk is used as using stainless steel.
Existing frequently-used encoder code disc is Gray code code-disc, and when encoder digit is N, then the code channel number of code-disc is also
N.10 Gray code metal code disk patterns are as shown in figure 1, black solid portion is the openwork part of metal code disk, i.e. code-disc in figure
Light transmission part.Each code channel all corresponds to a reading head, altogether 10 reading heads, and 10 reading heads are arranged in a line, from
Innermost circle is calculated separately as A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, the arrangement position of 10 reading heads to outmost turns reading head
Put as shown in Figure 2.When code-disc is rotated, 0,1 signal exported according to 10 reading heads, you can believed with the position for determining rotating shaft
Breath.
Because metal code disk openwork part shown in Fig. 1 is too many, when encoder works, or using after a period of time, hold
Code-disc deformation is easily caused, or produces vibration, the precise decreasing of optical electric axial angle encoder is caused, even resulting in encoder can not be just
Often work.
The content of the invention
In view of this, the embodiments of the invention provide a kind of absolute optical encoder code-disc and absolute type photoelectric coding
Device, reduces the openwork part of code-disc on the basis of traditional Gray code metal code disk, increases the mechanical strength of code-disc, reduces code-disc
Malformation.
In a first aspect, the absolute optical encoder code-disc that the present invention is provided, the code-disc is metal code disk, the metal
Code-disc has code area and noncoding region, and the code area and the noncoding region are set at equal intervals in a circumferential direction, described
Gray code is set using hollow out in code area, and the Gray code sets two reading heads, the non-volume on each code area
Code area is not void region.
Alternatively, the angle of the code area and noncoding region is 22.5 degree.
Alternatively, the code-disc is 10 metal Gray code code-discs, from inside to outside respectively the first code channel, the second code channel,
Third yard road, the 4th code channel, the 5th code channel, the 6th code channel, the 7th code channel, the 8th code channel, the 9th code channel and the tenth code channel, with
The starting point of one code channel not hollow out is designated as 0 ° of position of the first code channel, rotated counterclockwise by angle increase.
Alternatively, the code-disc calculates noncoding region using the first relation, and first relation is：
(- 11.25+N × 22.5 °)~(11.25+N × 22.5 °), N=0,2,4,6,8,10,12,14；
The noncoding region for obtaining the code-disc is respectively：- 11.25 °~11.25 °, 33.75 °~56.25 °, 78.75 °~
101.25 °, 123.75 °~146.25 °, 168.75 °~191.25 °, 213.75 °~236.25 °, 258.75 °~281.25 °,
303.75 °~326.25 ° regions.
Alternatively, 11.25 ° of the 5th code channel~33.75 °, 56.25 °~78.75 °, 101.25 °~123.75 °,
146.25 °~168.75 °, 191.25 °~213.75 °, 236.25 °~258.75 °, 281.25 °~303.75 °, 326.25 °~
348.75 ° of parts are openwork part as code area, remaining not hollow out be used as noncoding region.
Alternatively, when the signal that the first reading head for detecting the 5th code channel is read is " 0 ", then the second reading head is read
Signal be then " 1 ", now the first reading head is in the blind area of code-disc signal, the invalidating signal read, at the second reading head
In the effective coverage of code-disc signal, the first angle information of code-disc can be correctly read, the first angle information is subtracted
Exported after 22.5 ° as the angle value of encoder；
When the signal that first reading head is read is " 1 ", then the signal that the second reading head is read is then " 0 ", the first reading head
Effective coverage in code-disc signal, can correctly read the second angle information of code-disc, and the first reading head is then in code-disc
The blind area of signal, the invalidating signal read, using the second angle information as encoder angle value.
Alternatively, first code channel 191.25 °~213.75 °, 236.25 °~258.75 °, 281.25 °~
Part in the range of 303.75 °, 326.25 °~348.75 ° needs hollow out as code area；
Second code channel will all be used as code area between 90 degree to 270 degree outside noncoding region；
The third yard road is portrayed according to the second relation, and second relation is：
(360 °/8+N × 360 °/2)~(360 ° × 3/8+N × 360 °/2) N=0,1；
4th code channel is portrayed according to the 3rd relation, and the 3rd relation is：
(360 °/16+N × 360 °/4)~(360 ° × 3/16+N × 360 °/4) N=0,1,2,3；
5th code channel is portrayed according to the 4th relation, and the 4th relation is：
(360 °/32+N × 360 °/8)~(360 ° × 3/32+N × 360 °/8) N=0,1,2 ..., 7；
6th code channel is portrayed according to the 5th relation, and the 5th relation is：
(360 °/64+N × 360 °/16)~(360 ° × 3/64+N × 360 °/16) N=0,1,2 ..., 15；
7th code channel is portrayed according to the 6th relation, and the 6th relation is：
(360 °/128+N × 360 °/32)~(360 ° × 3/128+N × 360 °/32) N=0,1,2 ..., 31；
8th code channel is portrayed according to the 7th relation, and the 7th relation is：
(360 °/256+N × 360 °/64)~(360 ° × 3/256+N × 360 °/64) N=0,1,2 ..., 63；
9th code channel is portrayed according to the 8th relation, and the 8th relation is：
(360 °/512+N × 360 °/128)~(360 ° × 3/512+N × 360 °/128) N=0,1,2 ..., 127；
Tenth code channel is portrayed according to the 9th relation, and the 9th relation is：
(360 °/1024+N × 360 °/256)~(360 ° × 3/1024+N × 360 °/256) N=0,1,2 ..., 255.
Alternatively, the thickness of the code-disc is 0.05mm, 0.08mm, 0.1mm, 0.15mm or 0.2mm.
Alternatively, the material of the code-disc is 304 stainless steels.
Second aspect, the absolute optical encoder that the present invention is provided, including above-mentioned code-disc.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below：
The present invention is that the openwork part of code-disc is reduced on the basis of traditional Gray code metal code disk, increases the machinery of code-disc
Intensity, reduces the malformation of code-disc, further improves the precision of encoder.The code-disc is suitably applied in oscillation intensity greatly, ring
The more severe occasion in border.
Brief description of the drawings
Fig. 1 is the schematic diagram that metal Gray code-disc of the prior art portrays mode；
Fig. 2 is the schematic diagram of metal Gray code wheel reading head arrangement position of the prior art；
Fig. 3 is that the code-disc of absolute optical encoder code-disc in the embodiment of the present invention portrays the schematic diagram of mode；
Fig. 4 is the schematic diagram of the reading head arrangement position of absolute optical encoder code-disc in the embodiment of the present invention；
Fig. 5 is the Gray code and the transformational relation of binary code of absolute optical encoder code-disc in the embodiment of the present invention
Figure.
Embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, should all belong to the model that the present invention is protected
Enclose.
Term " first ", " second ", " the 3rd " in description and claims of this specification and above-mentioned accompanying drawing, "
The (if present)s such as four " are for distinguishing similar object, without for describing specific order or precedence.It should manage
The data that solution is so used can be exchanged in the appropriate case, so that the embodiments described herein can be with except illustrating herein
Or the order beyond the content of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that
Covering is non-exclusive to be included, for example, containing process, method, system, product or the equipment of series of steps or unit need not limit
In those steps or unit for clearly listing, but may include not list clearly or for these processes, method, production
Product or the intrinsic other steps of equipment or unit.
With reference to shown in Fig. 3, the absolute optical encoder code-disc that the present invention is provided, the code-disc is metal code disk, described
Metal code disk has code area and noncoding region, and the code area and the noncoding region are set at equal intervals in a circumferential direction,
Gray code is set using hollow out in the code area, and the Gray code sets two reading heads on each code area, it is described
Noncoding region is not void region.
Alternatively, the angle of the code area and noncoding region is 22.5 degree.
Alternatively, the code-disc is 10 metal Gray code code-discs, from inside to outside respectively the first code channel, the second code channel,
Third yard road, the 4th code channel, the 5th code channel, the 6th code channel, the 7th code channel, the 8th code channel, the 9th code channel and the tenth code channel, with
The starting point of one code channel not hollow out is designated as 0 ° of position of the first code channel, rotated counterclockwise by angle increase.
Alternatively, the code-disc calculates noncoding region using the first relation, and first relation is：
(- 11.25+N × 22.5 °)~(11.25+N × 22.5 °), N=0,2,4,6,8,10,12,14；
The noncoding region for obtaining the code-disc is respectively：- 11.25 °~11.25 °, 33.75 °~56.25 °, 78.75 °~
101.25 °, 123.75 °~146.25 °, 168.75 °~191.25 °, 213.75 °~236.25 °, 258.75 °~281.25 °,
303.75 °~326.25 ° regions.
Alternatively, 11.25 ° of the 5th code channel~33.75 °, 56.25 °~78.75 °, 101.25 °~123.75 °,
146.25 °~168.75 °, 191.25 °~213.75 °, 236.25 °~258.75 °, 281.25 °~303.75 °, 326.25 °~
348.75 ° of parts are openwork part as code area, remaining not hollow out be used as noncoding region.
Alternatively, when the signal that the first reading head for detecting the 5th code channel is read is " 0 ", then the second reading head is read
Signal be then " 1 ", now the first reading head is in the blind area of code-disc signal, the invalidating signal read, at the second reading head
In the effective coverage of code-disc signal, the first angle information of code-disc can be correctly read, the first angle information is subtracted
Exported after 22.5 ° as the angle value of encoder；
When the signal that first reading head is read is " 1 ", then the signal that the second reading head is read then for " 0, at the first reading head
In the effective coverage of code-disc signal, the second angle information of code-disc can be correctly read, and the first reading head is then believed in code-disc
Number blind area, the invalidating signal read, using the second angle information as encoder angle value.
Alternatively, first code channel 191.25 °~213.75 °, 236.25 °~258.75 °, 281.25 °~
Part in the range of 303.75 °, 326.25 °~348.75 ° needs hollow out as code area；
Second code channel will all be used as code area between 90 degree to 270 degree outside noncoding region；
The third yard road is portrayed according to the second relation, and second relation is：
(360 °/8+N × 360 °/2)~(360 ° × 3/8+N × 360 °/2) N=0,1；
4th code channel is portrayed according to the 3rd relation, and the 3rd relation is：
(360 °/16+N × 360 °/4)~(360 ° × 3/16+N × 360 °/4) N=0,1,2,3；
5th code channel is portrayed according to the 4th relation, and the 4th relation is：
(360 °/32+N × 360 °/8)~(360 ° × 3/32+N × 360 °/8) N=0,1,2 ..., 7；
6th code channel is portrayed according to the 5th relation, and the 5th relation is：
(360 °/64+N × 360 °/16)~(360 ° × 3/64+N × 360 °/16) N=0,1,2 ..., 15；
7th code channel is portrayed according to the 6th relation, and the 6th relation is：
(360 °/128+N × 360 °/32)~(360 ° × 3/128+N × 360 °/32) N=0,1,2 ..., 31；
8th code channel is portrayed according to the 7th relation, and the 7th relation is：
(360 °/256+N × 360 °/64)~(360 ° × 3/256+N × 360 °/64) N=0,1,2 ..., 63；
9th code channel is portrayed according to the 8th relation, and the 8th relation is：
(360 °/512+N × 360 °/128)~(360 ° × 3/512+N × 360 °/128) N=0,1,2 ..., 127；
Tenth code channel is portrayed according to the 9th relation, and the 9th relation is：
(360 °/1024+N × 360 °/256)~(360 ° × 3/1024+N × 360 °/256) N=0,1,2 ..., 255.
Alternatively, the thickness of the code-disc is 0.05mm, 0.08mm, 0.1mm, 0.15mm or 0.2mm.
Alternatively, the material of the code-disc is 304 stainless steels.
Technical scheme is specifically introduced with 10 Gray code code-discs below：
10 Gray code code-disc patterns that the present invention is provided are as shown in figure 3, black solid portion is the hollow out of code-disc in figure
Part, remainder not hollow out.The code-disc of the present invention is the hollow-out parts that metal code disk is reduced based on traditional Gray's code-disc
Point, to increase the mechanical strength of code-disc.While reducing code-disc hollow out, each code channel increases by a pair of reading heads with correct readout code
The positional information of disk.
Code channel of the code-disc from innermost circle to outmost turns is calculated separately as A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, with
The starting point of A1 code channels not hollow out is designated as 0 ° of position of the code channel, rotated counterclockwise by angle increase.11.25 ° of A5 code channels~
33.75 °, 56.25 °~78.75 °, 101.25 °~123.75 °, 146.25 °~168.75 °, 191.25 °~213.75 °,
236.25 °~258.75 °, 281.25 °~303.75 °, 326.25 °~348.75 ° parts be openwork part, remaining not hollow out.
The code-disc A5 code channels of the present invention are as traditional Gray's code-disc A5 code channels, and remaining code channel differs with traditional Gray code code channel
Sample, -11.25 °~11.25 ° of all code channels of the invention, 33.75 °~56.25 °, 78.75 °~101.25 °, 123.75 °~
146.25 °, 168.75 °~191.25 °, 213.75 °~236.25 °, 258.75 °~281.25 °, 303.75 °~326.25 ° portions
Point equal not hollow out, remaining openwork part is as traditional Gray code code-disc openwork part.
With reference to shown in Fig. 4, when shown code-disc of the invention carries out signal extraction, each increased a pair of reading heads of code channel with
Original reading head differs 22.5 °, the reading head newly increased be counted as A1 ', A2 ', A3 ', A4 ', A5 ', A6 ', A7 ', A8 ', A9 ',
A10 ' makees reading head.
Encoder to code-disc when carrying out signal-obtaining, and the signal that reading head A5 and A5 ' is read is always opposite.I.e. such as
When the signal that fruit A5 is read is " 0 ", then the signal that A5 ' is read is then " 1 ", and now reading head A1~A10 is then in code-disc signal
Blind area, the invalidating signal read, now reading head A1 '~A10 ' be in code-disc signal effective coverage, can correctly read
The angle information of code fetch disk.If the signal that A5 is read is " 1 ", the signal that A5 ' is read is then " 0 ", now reading head A1
~A10 is in the effective coverage of code-disc signal, can correctly read the angle information of code-disc, and reading head A1 '~A10 ' then locates
In the blind area of code-disc signal, the invalidating signal read.
When encoder carries out signal-obtaining in the angle position to code-disc, reading head A5 and A5 ' value is read first.If
Reading head A5 value is " 1 ", then the value now read reading head A1~A10 is carried out after Gray code-binary decoding, is
The angle value of encoder code disc now；If reading head A5 ' value is " 1 ", now reading head A1 '~A10 ' is read
Value is carried out after Gray code-binary decoding, it is necessary to subtract 22.5 ° again, and the value after subtracting is the angle of encoder code disc now
Value, is then that transformation result subtracts the binary system angle value output as encoder after 64 code values with binary representation.
As shown in figure 5, the transformational relation figure of Gray code and binary code, wherein A1~A10 is Gray code, Bit9~Bit0
For binary code, Bit9 is a high position for binary code, and Bit0 is the low level of binary code.A high position is first changed during conversion, binary system
The high-order Bit9 of code is directly equal to the A1 values of Gray code, and binary system synchronous codes high position Bit8 is equal to A2 and Bit9 and entered after line position XOR
Numerical value, the like, until all positions convert, those of ordinary skill in the art to this it is to be appreciated that repeat no more.
Second aspect, the absolute optical encoder that the present invention is provided, including above-mentioned code-disc.On absolute encoder code-disc
Have many road grooves, per pass groove successively with 2 lines, 4 lines, 8 lines, 16 lines ... layout, so, in each position of encoder
Put, by reading the logical, dark of per pass groove, obtain unique binary coding of one group of n-1 power from 2 zero degree side to 2
(Gray code), encoder is determined by the mechanical location of code-disc, and it is not influenceed by having a power failure, disturbing.
The present invention is that the openwork part of code-disc is reduced on the basis of traditional Gray code metal code disk, increases the machinery of code-disc
Intensity, reduces the malformation of code-disc, further improves the precision of encoder.The code-disc is suitably applied in oscillation intensity greatly, ring
The more severe occasion in border.
It is apparent to those skilled in the art that, for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, may be referred to the corresponding process in preceding method embodiment, will not be repeated here.
In several embodiments provided herein, it should be understood that disclosed system, apparatus and method can be with
Realize by another way.For example, device embodiment described above is only schematical, for example, the unit
Divide, only a kind of division of logic function there can be other dividing mode when actually realizing, such as multiple units or component
Another system can be combined or be desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or
The coupling each other discussed or direct-coupling or communication connection can be the indirect couplings of device or unit by some interfaces
Close or communicate to connect, can be electrical, machinery or other forms.
The unit illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit
The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is can
To instruct the hardware of correlation to complete by program, the program can be stored in a computer-readable recording medium, storage
Medium can include：Read-only storage (ROM, Read Only Memory), random access memory (RAM, Random
Access Memory), disk or CD etc..
A kind of absolute optical encoder code-disc and absolute optical encoder provided by the present invention are carried out above
It is discussed in detail, for those of ordinary skill in the art, according to the thought of the embodiment of the present invention, in embodiment and application
It will change in scope, in summary, this specification content should not be construed as limiting the invention.
Claims (10)
1. a kind of absolute optical encoder code-disc, it is characterised in that the code-disc is metal code disk, the metal code disk has
Code area and noncoding region, the code area and the noncoding region are set at equal intervals in a circumferential direction, in the code area
Gray code is set using hollow out, and the Gray code sets two reading heads on each code area, the noncoding region is not
Void region.
2. absolute optical encoder code-disc according to claim 1, it is characterised in that the code area and noncoding region
Angle be 22.5 degree.
3. absolute optical encoder code-disc according to claim 1 or 2, it is characterised in that the code-disc is 10 gold
Belong to Gray code code-disc, from inside to outside respectively the first code channel, the second code channel, third yard road, the 4th code channel, the 5th code channel, the 6th
Code channel, the 7th code channel, the 8th code channel, the 9th code channel and the tenth code channel, the first code channel is designated as with the starting point of the first code channel not hollow out
0 ° of position, rotated counterclockwise by angle increase.
4. absolute optical encoder code-disc according to claim 3, it is characterised in that the code-disc uses the first relation
Noncoding region is calculated, first relation is：
(- 11.25+N × 22.5 °)~(11.25+N × 22.5 °), N=0,2,4,6,8,10,12,14；
The noncoding region for obtaining the code-disc is respectively：- 11.25 °~11.25 °, 33.75 °~56.25 °, 78.75 °~
101.25 °, 123.75 °~146.25 °, 168.75 °~191.25 °, 213.75 °~236.25 °, 258.75 °~281.25 °,
303.75 °~326.25 ° regions.
5. absolute optical encoder code-disc according to claim 4, it is characterised in that 11.25 ° of the 5th code channel~
33.75 °, 56.25 °~78.75 °, 101.25 °~123.75 °, 146.25 °~168.75 °, 191.25 °~213.75 °,
236.25 °~258.75 °, 281.25 °~303.75 °, 326.25 °~348.75 ° parts be openwork part as code area, its
Remaining not hollow out is used as noncoding region.
6. absolute optical encoder code-disc according to claim 5, it is characterised in that when detecting the of the 5th code channel
When the signal that one reading head is read is " 0 ", then the signal that the second reading head is read is then " 1 ", and now the first reading head is in code
The blind area of disk signal, the invalidating signal read, the second reading head is in the effective coverage of code-disc signal, can correct readout code
The first angle information of disk, the first angle information is subtracted the angle value after 22.5 ° as encoder and exported；
When the signal that first reading head is read is " 1 ", then the signal that the second reading head is read is then " 0 ", and the first reading head is in
The effective coverage of code-disc signal, can correctly read the second angle information of code-disc, and the first reading head is then in code-disc signal
Blind area, the invalidating signal read, using the second angle information as encoder angle value.
7. absolute optical encoder code-disc according to claim 6, it is characterised in that first code channel exists
Portion in the range of 191.25 °~213.75 °, 236.25 °~258.75 °, 281.25 °~303.75 °, 326.25 °~348.75 °
Dividing needs hollow out as code area；
Second code channel will all be used as code area between 90 degree to 270 degree outside noncoding region；
The third yard road is portrayed according to the second relation, and second relation is：
(360 °/8+N × 360 °/2)~(360 ° × 3/8+N × 360 °/2) N=0,1；
4th code channel is portrayed according to the 3rd relation, and the 3rd relation is：
(360 °/16+N × 360 °/4)~(360 ° × 3/16+N × 360 °/4) N=0,1,2,3；
5th code channel is portrayed according to the 4th relation, and the 4th relation is：
(360 °/32+N × 360 °/8)~(360 ° × 3/32+N × 360 °/8) N=0,1,2 ..., 7；
6th code channel is portrayed according to the 5th relation, and the 5th relation is：
(360 °/64+N × 360 °/16)~(360 ° × 3/64+N × 360 °/16) N=0,1,2 ..., 15；
7th code channel is portrayed according to the 6th relation, and the 6th relation is：
(360 °/128+N × 360 °/32)~(360 ° × 3/128+N × 360 °/32) N=0,1,2 ..., 31；
8th code channel is portrayed according to the 7th relation, and the 7th relation is：
(360 °/256+N × 360 °/64)~(360 ° × 3/256+N × 360 °/64) N=0,1,2 ..., 63；
9th code channel is portrayed according to the 8th relation, and the 8th relation is：
(360 °/512+N × 360 °/128)~(360 ° × 3/512+N × 360 °/128) N=0,1,2 ..., 127；
Tenth code channel is portrayed according to the 9th relation, and the 9th relation is：
(360 °/1024+N × 360 °/256)~(360 ° × 3/1024+N × 360 °/256) N=0,1,2 ..., 255.
8. absolute optical encoder code-disc according to claim 1, it is characterised in that the thickness of the code-disc is
0.05mm, 0.08mm, 0.1mm, 0.15mm or 0.2mm.
9. the absolute optical encoder code-disc according to claim 1 or 8, it is characterised in that the material of the code-disc is
304 stainless steels.
10. a kind of absolute optical encoder, it is characterised in that including code-disc as claimed in any one of claims 1-9 wherein.
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