CN204373672U

CN204373672U - A kind of absolute type encoder

Info

Publication number: CN204373672U
Application number: CN201520010824.7U
Authority: CN
Inventors: 王新力
Original assignee: FOSHAN QINGZI PRECISION MEASUREMENT AND CONTROL TECHNOLOGY Co Ltd
Current assignee: FOSHAN QINGZI PRECISION MEASUREMENT AND CONTROL TECHNOLOGY Co Ltd
Priority date: 2015-01-08
Filing date: 2015-01-08
Publication date: 2015-06-03
Anticipated expiration: 2025-01-08

Abstract

The utility model discloses a kind of absolute type encoder, belong to scrambler field, this scrambler comprises main shaft, described main shaft is provided with line laser light source, described circuit system part is fixed on described main shaft bottom, described light-sensitive array sensor forms by Complimentary Metal-Oxide semiconductor photosensitive element is integrated, and is installed on described outer casing inner wall, and described shell is installed on described circuit system part.The utility model replaces code-disc with light-sensitive array sensor, solves the technical matters of prior art encoder resolution by code-disc restriction, and the Measurement Resolution of scrambler obtains and significantly promotes, and without the need to special code-disc, manufactures processing cost and greatly reduces.

Description

A kind of absolute type encoder

Technical field

The utility model relates to scrambler field, particularly relates to a kind of absolute type encoder.

Background technology

In the production of modern manufacturing industry, more and more higher requirement is proposed to the degree of accuracy of machine operation.Scrambler is the Primary Component affecting machine operation degree of accuracy, its in mechanical rotating shaft motion process resetting shaft position information to control system to reach the object accurately controlling rotating shaft rotary motion position and speed.

Scrambler is divided into absolute type and relative type motor two kinds, and absolute type encoder can reflect the positional information of mechanical rotating shaft relative to predetermined initial point, the reflection of relative type motor scrambler be then current axis position relative to the positional information of front axle position.

A lot of absolute type encoder at present, the coded system of employing is gray encoding.Namely on code-disc, engrave multiple tracks code channel, every bar code channel have successively 2,4,8,16...2 ^xroad groove.When scrambler works, code-disc is penetrated in the illumination sent by light source, by reading the secretly bright of per pass groove, obtaining a group code value come a unique corresponding axle position with this.Although this kind of scrambler principle is simple, reliable operation, strong interference immunity, its code-disc manufacturing process is complicated, and the maximum code number of channels that can carve and maximum groove number also have certain limit, can not meet the requirement of ultrahigh resolution processing.

Chinese patent CN200710006964.7 discloses a kind of scrambler, this scrambler is installed on motor or by motor-driven machine, detect the scrambler of positional information or velocity information, from the reason representing various inside, the information of the timeliness change of external cause or long-time caused code device signal characteristic value, thus obtain to the valuable information of failure prediction with to the valuable information of reason determining that alarm sends discontinuously, thus improve the maintainability of scrambler; This technical scheme mainly processes to the signal that conventional codec exports the effect improving coding, but it does not solve the technical matters of existing encoder resolution by code-disc restriction.

Summary of the invention

In order to solve the technical matters of prior art encoder encodes device resolution by code-disc restriction, the utility model provides a kind of absolute type encoder, and this scrambler can break away from the restriction of code-disc, and control resolution obtains and significantly promotes.

In order to achieve the above object, the utility model provides following technical scheme:

A kind of absolute type encoder, comprise main shaft, line laser light source, light-sensitive array sensor, circuit system part and shell, described main shaft is provided with line laser light source, described circuit system part is fixed on described main shaft bottom, described light-sensitive array sensor is by CMOS(Complementary Metal-Oxide Semiconductor, Complimentary Metal-Oxide semiconductor (hereinafter referred to as CMOS)) light activated element is integrated forms, and being installed on described outer casing inner wall, described shell is installed on described circuit system part.

Improve as the technical program a kind of the right cylinder that described shell is middle part hollow out, described light-sensitive array sensor with described main shaft for axis annular array is distributed on described outer casing inner wall.

Another kind as the technical program improves, and described light-sensitive array sensor is for receiving the laser of described line laser light source injection and being converted to analog voltage signal and outputting in described circuit system part.

Improve as another of the technical program, described circuit system part for described line laser light source provides power supply, and is converted to digital signal 1 or 0 for the analog voltage signal described light-sensitive array sensor exported by brush.

Preferably, described circuit system part comprises ROM (read-only memory), produce when the non-Stimulated Light of other Complimentary Metal-Oxide optical semiconductor photosensitive elements is irradiated when described ROM (read-only memory) stored record has described Complimentary Metal-Oxide optical semiconductor photosensitive elements Stimulated Light to irradiate and in light-sensitive array sensor code value and code value corresponding axle parallactic angle degree.

Preferably, described code value is binary code value.

In a word, the utility model compared with prior art, has following technical advantage:

The utility model replaces code-disc with photosensitive cmos sensor array, the CMOS light activated element that pixel dimension is 2.2um*2.2um is had by currently available technology, if internal diameter of outer cover is 42mm, then array circumferentially distributes a total 42mm*3.14/2.2um=60000 CMOS pixel, then this encoder resolution is at least 360/60000=20 " (angular unit: rad), further, along with the increase of internal diameter of outer cover, LASER Light Source rotates a circle and can scan more pixel, resolution can reach higher level, and the common absolute type encoder of prior art generally has the resolution of 14, be 360/2^14=79 ", it can thus be appreciated that scrambler of the present utility model is compared with the scrambler of prior art, resolution can be crossed acquisition and significantly promote, obtain revolutionaryly progressive, without the need to special code-disc, manufacture processing cost greatly to reduce.

Accompanying drawing explanation

Fig. 1 is the structural representation of the utility model absolute type encoder;

Fig. 2 is the utility model absolute type encoder inner structure schematic diagram;

In figure: 1 main shaft, 2 line laser light sources, 3 light-sensitive array sensors, 4 circuit system parts, 5 shells,

31CMOS light activated element.

Embodiment

Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent.

To those skilled in the art, in accompanying drawing, some known features and explanation thereof may be omitted is understandable.

Below in conjunction with drawings and Examples, be clearly and completely described the technical scheme in the utility model, obviously, described embodiment is only utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.

As shown in Figure 1-2, for the structural representation of the absolute type encoder of the utility model preferred embodiment, comprise main shaft 1, line laser light source 2, light-sensitive array sensor 3, circuit system part 4 and shell 5, described main shaft 1 is provided with line laser light source 2, described circuit system part 4 is fixed on described main shaft 5 bottom, described light-sensitive array sensor 3 with described main shaft 1 on axis annular array is distributed in described shell 5 inwall, described shell 5 is the right cylinder of middle part hollow out, described light-sensitive array sensor 3 forms by CMOS light activated element 31 is integrated, described shell 5 is installed on described circuit system part 4, wherein, this light-sensitive array sensor 3 is for receiving the laser of described line laser light source 2 injection and being converted to a series of analog voltage signal and outputting in described circuit system part 4, this circuit system part 4 by brush for this line laser light source 2 provides power supply, and be converted to digital signal 1 or 0 for the analog voltage signal exported by described light-sensitive array sensor 3, this circuit system part 4 comprises ROM (read-only memory), produce when described ROM (read-only memory) stored record CMOS light activated element 31 Stimulated Light is irradiated and when in light-sensitive array sensor 3, the non-Stimulated Light of other CMOS light activated elements 31 is irradiated code value and code value corresponding axle parallactic angle degree.

During the work of this scrambler, be connected with mechanical rotating shaft to be measured by the main shaft 1 of shaft coupling by scrambler, main shaft 1 and mechanical rotating shaft do synchronous rotary and move, isochrone LASER Light Source 2 is energized, send linear laser, after CMOS light activated element on light-sensitive array sensor 3 receives laser signal, laser signal is converted to a series of analog voltage signal, and this analog voltage signal is outputted in circuit system part 4, this analog voltage signal is converted to digital signal 1 or 0 by circuit system part 4, be in particular: the analog voltage signal that the CMOS light activated element receiving laser signal exports is converted to digital signal 1, the analog voltage signal that the Complimentary Metal-Oxide optical semiconductor photosensitive elements not receiving laser signal exports is converted to digital signaling zero, thus draw a concrete code value, by stored record in ROM (read-only memory) in code value concrete for this body and described circuit system part 4 each described in the code value of CMOS light activated element carry out searching comparison, search the axle parallactic angle degree showing that this concrete code value is corresponding, namely the axle parallactic angle degree that measured axis is now actual is drawn, finally by 485 agreements, the measured axis actual axle parallactic angle degree drawn is outputted to measured axis electric machine control system and carry out feedback processing, realize accurately controlling rotating shaft rotary motion position and speed.

Embodiment two

in the present embodiment, light-sensitive array sensor on outer casing inner wall is made up of 10 CMOS light activated elements, then the analog voltage signal of CMOS light activated element output is through circuit system part A/D digits after conversion signal 1 or 0, form concrete code value, be in particular: when the 1st CMOS light activated element receives laser signal, remaining 9 CMOS light activated element does not receive laser signal, it is 0000000001 that the analog voltage signal that then CMOS light activated element exports exports concrete code value after circuit system part A/D digits after conversion signal, simultaneously by stored record in ROM (read-only memory) in this concrete code value and circuit system part each described in the code value of CMOS light activated element carry out searching comparison, as shown in table 1, thus show that the corresponding axle parallactic angle degree of this code value is 0 degree, in like manner can draw when the 2nd CMOS light activated element receives laser signal, when remaining 9 CMOS light activated element does not receive laser signal, the actual axle parallactic angle degree of measured axis, just do not repeating one by one at this.

Table 1 be stored record in ROM (read-only memory) in the present embodiment CMOS light activated element Stimulated Light irradiate time and light-sensitive array sensor in the non-Stimulated Light of other CMOS light activated elements irradiate time produce code value and code value corresponding axle parallactic angle degree.

Table 1

Code value	Corresponding angle (unit: degree)
		0000000001	0
0000000010	36
		0000000100	72
0000001000	108
		0000010000	144
0000100000	180
		0001000000	216
0010000000	252
		0100000000	288
1000000000	324

Claims

1. an absolute type encoder, comprise main shaft, line laser light source, light-sensitive array sensor, circuit system part and shell, it is characterized in that, described main shaft is provided with line laser light source, described circuit system part is fixed on described main shaft bottom, described light-sensitive array sensor forms by Complimentary Metal-Oxide semiconductor photosensitive element is integrated, and is installed on described outer casing inner wall, and described shell is installed on described circuit system part.

2. a kind of absolute type encoder as claimed in claim 1, is characterized in that, described shell be middle part hollow out right cylinder, described light-sensitive array sensor with described main shaft for axis annular array is distributed on described outer casing inner wall.