CN102944254A - Rotary encoder - Google Patents
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- CN102944254A CN102944254A CN2012105062109A CN201210506210A CN102944254A CN 102944254 A CN102944254 A CN 102944254A CN 2012105062109 A CN2012105062109 A CN 2012105062109A CN 201210506210 A CN201210506210 A CN 201210506210A CN 102944254 A CN102944254 A CN 102944254A
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Abstract
The invention provides a rotary encoder which comprises a light source, a first code disc, and a second code disc, wherein the first code disc is provided with a plurality of first light transmitting parts and a plurality of first light shielding parts which are alternatively arranged along the radial direction of the first code disc; the second code disc is provided with a plurality of second light transmitting parts and a plurality of second light shielding parts which are alternatively arranged along the radial direction of the second code disc; the first code disc and the second code disc share one same axis; the first code disc is positioned between the light source and the second code disc; and in the direction perpendicular to the disc plane of the first code disc and in the direction perpendicular to the disc plane of the second disc, the plurality of first light transmitting parts and the plurality of second light transmitting parts are respectively in correspondence in sequence, the plurality of first light shielding parts and the plurality of second light shielding parts are respectively in correspondence in sequence, and the radial width of any one first light shielding part is larger than the radial width of the second light shielding part corresponding to the first light shielding part.
Description
Technical field
The present invention relates to a kind of rotary encoder, relate in particular to the code-disc in the rotary encoder.
Background technology
Rotary encoder, be will rotation mechanical displacement be converted to electric signal, this signal is processed the sensor of rear detection position speed etc.Be mainly used in the measurement such as high precision displacement, angle in the industrial automation, the use field is extensive.Characteristic and accuracy requirement for rotary encoder are also more and more higher.
Fig. 1 be rotary encoder along the cut-open view radially of code-disc, in this rotary encoder 10, comprise successively light source 11, rotation code-disc 12, fixedly code-disc 13 and sensitive surface 14, light source 11 is the LED lamp for example, comprises luminescence chip 111 and lens 112.Wherein, rotation code-disc 12 has along radially (namely, left and right directions shown in Fig. 1) 3 the first light transmission parts 121 and 4 the first shading light parts 122 of alternately arranging, fixedly code-disc 13 has 3 the second light transmission parts 131 and 4 the second shading light parts 132 of arranging along radially alternating, perpendicular to rotation code-disc 12 and fixedly on the direction of the card of code-disc 13 (namely, on the above-below direction shown in Fig. 1), each the first light transmission part 121 and each second light transmission part 131 are corresponding respectively successively, and each the first shading light part 122 and each second shading light part 132 are corresponding respectively successively.In the light area below light source 11, the radial width of the second shading light part 132 of the radial width of any the first shading light part 122 and correspondence equates, and look up at upper and lower, any first shading light part 122 is at the two ends, the left and right sides on the left and right directions and the corresponding left and right sides justify align of the second shading light part 132 on left and right directions.
In ideal conditions, as shown in Figure 1, the light that sends from luminescence chip 111 becomes many parallel light through refraction behind the lens 112, light passes successively and shines corresponding on the sensitive surface 14 three sensitive area X, Y or Z behind any first light transmission part 121 and corresponding the second light transmission part 131, such as the scope of the indication of the arrow among the figure.For example light L11 passes the sensitive area X that shines behind the first light transmission part 121 and corresponding the second light transmission part 131 on the sensitive surface 14 successively.Simultaneously, for example some light of light L12 are blocked by the first shading light part 122, can not arrive sensitive area X, Y or Z, do not disturb and impact thereby can not produce three sensitive area X, Y of sensitive surface 14 or Z.
Yet, in the situation that reality, the light that the LED lamp sends also can not present perfect directional light characteristic, this is because the luminescence chip 111 in the LED lamp can not be regarded as pointolite, therefore the light through outgoing after sphere or the aspheric lens 112 can not form desirable parallel rays, but can form centered by light from luminescence chip 111 to external diffusion, as shown in Figure 2.In the light of these diffusions, for example light L1 is equally through shining the sensitive area of the correspondence on the sensitive surface 14, for example sensitive area X behind the first light transmission part 121, corresponding the second light transmission part 131.But because these light tilt, so some light, for example light L2 will or directly arrive on other sensitive areas of sensitive surface 14 because of reflection, refraction, rather than on the corresponding sensitive area.For example, as shown in Figure 2, the light L2 in left side directly arrives on the sensitive area X of sensitive surface 14, perhaps through becoming after superrefraction, the reflection on the sensitive area X that light L2 ' arrives sensitive surface 14, rather than on the light L2 sensitive area Y that should arrive.Like this, will produce this sensitive area X of sensitive surface 14 and disturb, and this light L2 just is called as interference light.In the course of work of rotary encoder, disturb the existence of light may cause the precision of signal and cycle to produce fluctuation, affect user's use and control accuracy, even may produce misoperation, thereby cause the inefficacy of system.
So that the light that sends from light source becomes parallel rays, in the prior art, set up in addition lens (figure does not look) for as far as possible between light source and rotation code-disc, the light that is used for that light source is sent is proofreaied and correct and is become parallel light.Yet, still can not become desirable parallel rays by the light of outgoing behind these lens, therefore, still there is the impact of disturbing light.And owing to setting up such lens, so that the complex structure of whole rotary encoder, cost increases.
Summary of the invention
The object of the present invention is to provide a kind of rotary encoder, this rotary encoder can prevent from disturbing the impact of light effectively, can not make the complex structure of whole rotary encoder simultaneously, and can not increase cost.
The invention provides a kind of rotary encoder, comprising: light source; The first code-disc, have a plurality of the first light transmission parts and a plurality of the first shading light part arranged along the radially alternating of described the first code-disc, described a plurality of the first light transmission parts and described a plurality of the first shading light parts lay respectively at axis take described the first code-disc on the different circumference of the radius in the center of circle; The second code-disc, have a plurality of the second light transmission parts and a plurality of the second shading light part arranged along the radially alternating of described the second code-disc, described a plurality of the second light transmission part and described a plurality of the second shading light parts lay respectively at axis take described the second code-disc on the different circumference of the radius in the center of circle, and the axis of the axis of described the first code-disc and described the second code-disc is same axis; Described the first code-disc is between described light source and described the second code-disc, on the direction perpendicular to the card of described the first code-disc and described the second code-disc, described a plurality of the first light transmission part and described a plurality of the second light transmission part are corresponding respectively successively, described a plurality of the first shading light part and described a plurality of the second shading light part are corresponding respectively successively, wherein, the radial width of any the first shading light part is larger than the radial width of the second corresponding shading light part.
Described the first code-disc is to be with respect to the non-rotatable fixedly code-disc of its axis with respect to the rotatable rotation code-disc of its axis and described the second code-disc, and perhaps described the first code-disc is that described fixedly code-disc and described the second code-disc are described rotation code-discs.
Each first light transmission part and each second light transmission part are respectively to arrange in the circumferential direction of the circle the grating that consists of by one or more transmissive slits.
Described light source comprises luminescence chip and lens, and the light of the described lens outgoing of process of sending from described luminescence chip is the light that described light source sends, and the illumination that described light source sends is mapped on the card of described the first code-disc.
The central ray that center line by described light source sends is perpendicular to the card of described the first code-disc and described the second code-disc, any first shading light part diametrically near an end of described central ray than the second corresponding shading light part diametrically near the more close described central ray of an end of described central ray.
In the light that passes any the first light transmission part that described light source sends, light and the angle between described central ray of a described end of described any the first shading light part of adjacency are α, vertical range between the card of the card of described the first code-disc and described the second code-disc is d, the distance that a described end of described any the first shading light part arrives between described central ray diametrically is w1, a described end of the second shading light part of described correspondence is w2 in described footpath upward to the distance between described central ray, wherein
w2≥w1+d×tanα。
The scope of described angle α is 0 °≤α≤10 °.
In the light that passes any the first light transmission part that described light source sends, in abutting connection with described any first shading light part, away from light and the angle between described central ray of the other end of described central ray, be β diametrically, the distance that the described other end of described any the first shading light part arrives between described central ray diametrically is c1, the second shading light part of described correspondence is c2 in described footpath upward to the distance between described central ray away from the other end of described central ray diametrically, wherein
c2≤c1+d×tanα。
The scope of described angle β is 0 °≤β≤10 °.
By the present invention, when stopping interference light, each sensitive area that does not affect on the sensitive surface produces signal.So, can improve the optical purity that is subjected to of each sensitive area on the sensitive surface, improve the phase propetry of rotary encoder, and improve the precision of signal.
Description of drawings
Fig. 1 is that desirable rotary encoder is along the cut-open view radially of code-disc;
Fig. 2 is that rotary encoder of the prior art is along the cut-open view radially of code-disc;
Fig. 3 is according to the rotary encoder of the embodiment of the invention cut-open view radially along code-disc;
Fig. 4 is the partial enlarged drawing among Fig. 3.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are described in detail.In the following description, radially being exactly the left and right directions among the figure, is exactly above-below direction perpendicular to the direction of the card of the first code-disc and the second code-disc.In addition, the light shown in the accompanying drawing only is in order to illustrate, and the present invention is not limited, and omits all the other light of diagram in order to make drawings clear.
Fig. 3 is according to the rotary encoder of the embodiment of the invention cut-open view radially along code-disc.As shown in Figure 3, rotary encoder 30 comprises light source 31, the first code-disc 32, the second code-disc 33 and sensitive surface 34.The first code-disc 32 is to be with respect to the non-rotatable fixedly code-disc of its axis with respect to the rotatable rotation code-disc of its axis and the second code-disc 33, and perhaps the first code-disc 32 is that fixedly code-disc and the second code-disc 33 are rotation code-discs.In this embodiment, the first code-disc 32 is the rotation code-disc, and the second code-disc 33 is fixing code-discs.
The first code-disc 32 has a plurality of the first light transmission parts 321 and a plurality of the first shading light part 322 of arranging along the radially alternating of the first code-disc 32, in this example, for example is furnished with 3 the first light transmission parts 321 and 4 the first shading light parts 322.That is to say, along the first code-disc 32 radially, namely, left and right directions in Fig. 3 is alternately arranged the first shading light part 322, the first light transmission part 321, the first shading light part 322, the first light transmission part 321, the first shading light part 322, the first light transmission part 321, the first shading light part 322 successively.
3 the first light transmission parts 321 and 4 the first shading light parts 322 lay respectively at axis take the first code-disc 32 on the different circumference of the radius in the center of circle.
The second code-disc 33 has a plurality of the second light transmission parts 331 and a plurality of the second shading light part 332 of arranging along the radially alternating of the second code-disc 33, in this example, for example is furnished with 3 the second light transmission parts 331 and 4 the second shading light parts 332.That is to say, along the second code-disc 33 radially, namely the left and right directions in Fig. 3 is alternately arranged the second shading light part 332, the second light transmission part 331, the second shading light part 332, the second light transmission part 331, the second shading light part 332, the second light transmission part 331, the second shading light part 332 successively.
3 the second light transmission parts 331 and 4 the second shading light parts 332 lay respectively at axis take the second code-disc 33 on the different circumference of the radius in the center of circle, and the axis of the axis of the first code-disc 32 and the second code-disc 33 is same axis.
Each the first light transmission part 321 and each second light transmission part 331 are respectively to arrange in the circumferential direction of the circle the grating that consists of by one or more transmissive slits.Therefore the structure of these gratings, omits concrete description here with of the prior art the same.
The first code-disc 32 is between light source 31 and the second code-disc 33.
On the direction perpendicular to the card of the first code-disc 32 and the second code-disc 33, namely, on the above-below direction in Fig. 3,3 the first light transmission parts 321 and 3 the second light transmission parts 331 are corresponding respectively successively, and 4 the first shading light parts 322 and 4 the second shading light parts 332 are corresponding respectively successively.That is to say, in this example, from left to right see, first the first shading light part 322 and first the second shading light part 332 correspondences, first the first light transmission part 321 and first the second light transmission part 331 correspondences, by that analogy.
In addition, in the light area below light source 31, the radial width of any the first shading light part 322 is larger than the radial width of the second corresponding shading light part 332, because the radial width of the first shading light part 322 of close light source 31 is larger than the radial width of the second corresponding shading light part 332, so can effectively stop interference light, for example disturb light L32, it is reflected away, thereby prevent from disturbing light L32 to arrive the sensitive area X that should not arrive.In addition, by as above arranging, the light that passes any the first light transmission part 321 can pass the second corresponding light transmission part 332, and can not blocked by the second light transmission part 332 of 332 both sides, the second light transmission part of correspondence, thereby arrives corresponding sensitive area.Therefore, when stopping interference light, each sensitive area that does not affect on the sensitive surface produces signal.
The central ray L30 that center line by light source 31 sends is perpendicular to the card of the first code-disc 32 and the second code-disc 33, and this central ray L30 is exactly the light that the center line by luminescence chip 331 sends.
On the direction perpendicular to the card of the first code-disc 32 and the second code-disc 33, namely, on above-below direction, any first shading light part 322 compares the diametrically more close central ray L30 of an end of close central ray L30 of the second corresponding shading light part 332 near the end of central ray L30 diametrically.
In this example, any first shading light part for example be from left to right the 2nd the first shading light part 322(hereinafter referred to as the first shading light part 322), the second corresponding shading light part for example be from left to right the 2nd the second shading light part 332(hereinafter referred to as the second shading light part 332) be example.
That is to say, on the direction perpendicular to the card of the first code-disc 32 and the second code-disc 33, the first shading light part 322 diametrically near the end s1 of central ray L30 than the second shading light part 332 more close central ray L30 of an end s3 of close central ray L30 diametrically.So, when stopping interference light L32, can guarantee to pass in abutting connection with the light of the first light transmission part 321 of an end s1 and all pass the second corresponding light transmission part 331(namely, the second light transmission part 331 in abutting connection with an end s3), and corresponding sensitive area Y on the arrival sensitive surface 34, and can not blocked by the second shading light part 332, so guarantee can not affect the signal that sensitive area Y produces.
In addition, referring to Fig. 4, in the light that passes any the first light transmission part 321 that light source 31 sends, the light of an end s1 of adjacency the first shading light part 322 (namely, light L31 in figure) and the angle between central ray L30 be α, vertical range between the card of the card of the first code-disc 32 and the second code-disc 33 is d, the distance that one end s1 of the first shading light part 322 arrives between central ray L30 diametrically is w1, the distance that one end s3 of the second shading light part 332 arrives between central ray L30 diametrically is w2, wherein
w2≥w1+d×tanα。Formula (1)
In this example, therefore the first code-disc 32 and the second code-disc 33 can ignore very little perpendicular to the thickness on the direction of card.
By so arranging, when stopping interference light, can further guarantee to pass in abutting connection with the light of the first light transmission part 321 of an end s1 and all pass the second corresponding light transmission part 331(namely, the second light transmission part 331 in abutting connection with an end s3), and corresponding sensitive area Y on the arrival sensitive surface 34, and can not blocked by the second shading light part 332, so further guarantee can not affect the signal that sensitive area Y produces.
Preferably, the scope of this angle α is 0 °≤α≤10 °.
In addition, in the light that passes any the first light transmission part 321 that light source 31 sends in abutting connection with the first shading light part 322 away from the light of the other end s2 of central ray L30 (namely diametrically, light L34) and the angle between central ray L30 be β, the distance that the other end s2 of the first shading light part 322 arrives between central ray L30 diametrically is c1, the second shading light part 332 is c2 away from the distance that the other end s4 of central ray L30 arrives between central ray L30 diametrically diametrically, wherein
c2≤c1+d×tanα。Formula (2)
By so arranging, can guarantee to pass in abutting connection with the light of the first light transmission part 321 of an end s2 and all pass the second corresponding light transmission part 331(namely, the second light transmission part 331 in abutting connection with an end s4), and corresponding sensitive area X on the arrival sensitive surface 34, and can not blocked by the second shading light part 332, so guarantee can not affect the signal that sensitive area X produces.
In addition, by an end s3 and the other end s4 of the second shading light part 332 as above are set, the position of an end s3 and other end s4 can be set arbitrarily in above-mentioned scope.For example, in this example, the other end s2 of the other end s4 of the second shading light part 332 and the first shading light part 322 is set to align at above-below direction, namely, c2=c1, simultaneously, the relation between an end s3 of the second shading light part 332 and the end s1 of the first shading light part is, w2〉w1+d * tan α, as shown in Figure 4.
Preferably, the scope of this angle α is 0 °≤α≤10 °.
By rotary encoder of the present invention, can when effectively preventing disturbing light to arrive the sensitive area that should not arrive, guarantee that each sensitive area receives needed light, that is, do not stop that needed light arrives each sensitive area.So, can improve the optical purity that is subjected to of each sensitive area on the sensitive surface, improve the phase propetry of rotary encoder, and improve the precision of signal.
Among the present invention, the number of the first light transmission part, the first shading light part, the second light transmission part, the second shading light part is not limited to the number in above-described embodiment, and other number can be set as required.In addition, each first light transmission part described above and each second light transmission part are arranged in the light area of light source below.Each first shading light part described above at least one end diametrically is arranged in the light area of light source below, and each second shading light part at least one end diametrically is arranged in the light area of light source below.
In the light area that is arranged in below the light source, any first shading light part diametrically near an end of central ray and corresponding the second shading light part diametrically an end of close central ray satisfy above-mentioned formula (1), any first shading light part satisfies above-mentioned formula (2) away from the other end of central ray away from the other end of central ray with corresponding the second shading light part diametrically diametrically.For each shading light part outside the light area below the light source, do not produce signal owing to not affecting sensitive surface, so the present invention does not limit, that is, be not subjected to the restriction of above-mentioned formula (2).For example, in this example, the left end of from left to right first the first shading light part (namely, the other end away from central ray L30) and the left end of first corresponding the second shading light part, and the right-hand member of the 4th the first shading light part (namely, the other end away from central ray L30) and the right-hand member of the 4th corresponding the second shading light part all outside the light area below the light source, therefore, position relationship between the left end of first the second shading light part of the left end of first the first shading light part and correspondence is not subjected to the restriction of above-mentioned formula (2), position relationship between the right-hand member of the 4th the second shading light part of the right-hand member of the 4th the first shading light part and correspondence is not subjected to the restriction of above-mentioned formula (2) yet, and can arrange according to actual needs.
Although specific embodiment of the present invention is described, these embodiment only explain by the mode of example, and are not intended to limit the scope of the invention.In fact, innovative approach described herein can be implemented by various other forms; In addition, also can carry out to method and system described herein various omissions, substitute and change and do not deviate from spirit of the present invention.Attached claim and the purpose of equivalents thereof are to contain such various forms or the modification that falls in the scope and spirit of the present invention.
Claims (9)
1. a rotary encoder is characterized in that, comprising:
Light source;
The first code-disc, have a plurality of the first light transmission parts and a plurality of the first shading light part arranged along the radially alternating of described the first code-disc, described a plurality of the first light transmission parts and described a plurality of the first shading light parts lay respectively at axis take described the first code-disc on the different circumference of the radius in the center of circle;
The second code-disc, have a plurality of the second light transmission parts and a plurality of the second shading light part arranged along the radially alternating of described the second code-disc, described a plurality of the second light transmission part and described a plurality of the second shading light parts lay respectively at axis take described the second code-disc on the different circumference of the radius in the center of circle, and the axis of the axis of described the first code-disc and described the second code-disc is same axis;
Described the first code-disc between described light source and described the second code-disc,
On the direction perpendicular to the card of described the first code-disc and described the second code-disc, described a plurality of the first light transmission parts and described a plurality of the second light transmission part are corresponding respectively successively, and described a plurality of the first shading light parts and described a plurality of the second shading light part are corresponding respectively successively,
Wherein, the radial width of any the first shading light part is larger than the radial width of the second corresponding shading light part.
2. rotary encoder as claimed in claim 1, it is characterized in that, described the first code-disc is to be with respect to the non-rotatable fixedly code-disc of its axis with respect to the rotatable rotation code-disc of its axis and described the second code-disc, and perhaps described the first code-disc is that described fixedly code-disc and described the second code-disc are described rotation code-discs.
3. rotary encoder as claimed in claim 1 is characterized in that, each first light transmission part and each second light transmission part are respectively to arrange in the circumferential direction of the circle the grating that consists of by one or more transmissive slits.
4. rotary encoder as claimed in claim 1, it is characterized in that, described light source comprises luminescence chip and lens, and the light of the described lens outgoing of process of sending from described luminescence chip is the light that described light source sends, and the illumination that described light source sends is mapped on the card of described the first code-disc.
5. rotary encoder as claimed in claim 4, it is characterized in that, the central ray that center line by described light source sends is perpendicular to the card of described the first code-disc and described the second code-disc, any first shading light part diametrically near an end of described central ray than the second corresponding shading light part diametrically near the more close described central ray of an end of described central ray.
6. rotary encoder as claimed in claim 5, it is characterized in that, light and the angle between the described central ray of a described end of described any the first shading light part of adjacency are α in the light that passes any the first light transmission part that described light source sends, vertical range between the card of the card of described the first code-disc and described the second code-disc is d, a described end of described any the first shading light part is w1 to the distance between the described central ray diametrically, a described end of the second shading light part of described correspondence is w2 in described footpath upward to the distance between the described central ray, wherein
w2≥w1+d×tanα。
7. rotary encoder as claimed in claim 6 is characterized in that, the scope of described angle α is 0 °≤α≤10 °.
8. rotary encoder as claimed in claim 6, it is characterized in that, be β away from light and the angle between the described central ray of the other end of described central ray diametrically in abutting connection with described any first shading light part in the light that passes any the first light transmission part that described light source sends, the described other end of described any the first shading light part is c1 to the distance between the described central ray diametrically, the second shading light part of described correspondence is c2 in described footpath upward to the distance between the described central ray away from the other end of described central ray diametrically, wherein
c2≤c1+d×tanα。
9. rotary encoder claimed in claim 8 is characterized in that, the scope of described angle β is 0 °≤β≤10 °.
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| CN201210506210.9A CN102944254B (en) | 2012-11-30 | 2012-11-30 | Rotary encoder |
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| CN201210506210.9A CN102944254B (en) | 2012-11-30 | 2012-11-30 | Rotary encoder |
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| CN104772782A (en) * | 2015-04-09 | 2015-07-15 | 河南职业技术学院 | Control system of circle cutting machine |
| CN106153090A (en) * | 2014-10-30 | 2016-11-23 | 株式会社岛津制作所 | Detecting apparatus for rotor position and rotary valve |
| CN107402024A (en) * | 2016-05-18 | 2017-11-28 | 虹光精密工业股份有限公司 | Rotary encoder with staggered encoding wheels |
| CN108627182A (en) * | 2017-03-22 | 2018-10-09 | 株式会社安川电机 | Electric machine control system, control method, encoder and motor control assembly |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106153090A (en) * | 2014-10-30 | 2016-11-23 | 株式会社岛津制作所 | Detecting apparatus for rotor position and rotary valve |
| CN104772782A (en) * | 2015-04-09 | 2015-07-15 | 河南职业技术学院 | Control system of circle cutting machine |
| CN107402024A (en) * | 2016-05-18 | 2017-11-28 | 虹光精密工业股份有限公司 | Rotary encoder with staggered encoding wheels |
| CN107402024B (en) * | 2016-05-18 | 2020-05-26 | 虹光精密工业股份有限公司 | Rotary encoder with staggered encoding wheels |
| CN108627182A (en) * | 2017-03-22 | 2018-10-09 | 株式会社安川电机 | Electric machine control system, control method, encoder and motor control assembly |
| CN108627182B (en) * | 2017-03-22 | 2020-08-07 | 株式会社安川电机 | Motor control system, control method, encoder and motor control device |
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|---|---|
| CN102944254B (en) | 2015-11-25 |
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