CN203772286U - Rotary encoder - Google Patents
Rotary encoder Download PDFInfo
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- CN203772286U CN203772286U CN201420050817.5U CN201420050817U CN203772286U CN 203772286 U CN203772286 U CN 203772286U CN 201420050817 U CN201420050817 U CN 201420050817U CN 203772286 U CN203772286 U CN 203772286U
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- light shielding
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- 230000003287 optical effect Effects 0.000 claims abstract description 93
- 238000002834 transmittance Methods 0.000 claims description 112
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 10
- 230000004313 glare Effects 0.000 description 8
- 238000002955 isolation Methods 0.000 description 7
- 238000009792 diffusion process Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000004020 luminiscence type Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
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Abstract
The utility model provides a rotary encoder which has a light source, a first code disc and a second code disc. The distance from one radial end portion of a light shielding part of one of the first code disc and the second code disc to the central axis of an optical axis is smaller than that from one radial end portion of a light shielding part of the other code disc to the central axis of the optical axis. The other radial end portion of the light shielding part of one of the first code disc and the second code disc to the central axis of an optical axis is smaller than that from the other radial end portion of a light shielding part of the other code disc to the central axis of the optical axis. Through such a structure, a rotary encoder which improves resolution and precision can be realized with a simple structure.
Description
Technical field
The utility model relates to a kind of rotary encoder.
Background technology
Rotary encoder is the device for measuring rotating speed, and photoelectric rotary coder, by opto-electronic conversion, can convert the mechanical quantity such as angular displacement, angular velocity of output shaft to corresponding electric pulse with digital output.Be mainly used in the measurement such as high precision displacement, angle in industrial automation, use field is very extensive.In recent years, more and more higher for the characteristic of rotary encoder and the requirement of precision.
In rotary encoder, can not be perfect directional light from the light sending as the LED of light source, this is because the light sending from the luminous wafer of LED can not be considered pointolite, therefore process sphere or aspheric lens can not form desirable directional light after converging, and therefore present a light source to surrounding diffusion centered by luminous wafer.
The light having spread arrives photo detector through the transmittance section of code-disc, because light tilts, so light not only arrives the each corresponding light area that should arrive, simultaneously also can be because of the light area of reflecting, reflect or directly arrive other phases, thereby other light areas have been produced to interference, and we claim this interference light that should not be subject to for " veiling glare ".
The existence of veiling glare may cause scrambler in the course of the work, and the precision of signal and cycle produce fluctuation, affects client's use and control accuracy, even may produce misoperation, causes the inefficacy of system.
For fear of produce veiling glare, at patent documentation 1(CN201210506210.9) in a kind of rotary encoder is disclosed.
Fig. 5 is the light schematic diagram of existing rotary encoder 100.
As shown in Figure 5, rotary encoder 100 comprises that light source, grating region are positioned at the rotation code-disc 102 of below of light source and fixing code-disc 103, photo detector (photodiode) 104.The grating region of rotation code-disc 102 and fixing code-disc 103 comprises respectively along multiple transmittance sections and the light shielding part of radially alternating configuration, and multiple light shielding parts on rotation code-disc 102 respectively with fixing code-disc 103 on multiple light shielding parts correspond to each other.In the time overlooking observation, the footpath of the light shielding part of rotation code-disc 102 upwards by a side of optical axis center line than the footpath of the corresponding light shielding part of fixing code-disc 103 side of leaning on optical axis center line upwards near optical axis center line, the footpath of the footpath that rotates the light shielding part on code-disc 102 side away from optical axis center line upwards and the corresponding light shielding part on fixing code-disc 103 side away from optical axis center line is upwards alignd.
The rotary encoder of this structure, by the isolation strip light is set near a side of optical axis center line, even if the length of light shielding part is long, at the area of the side expansion transmittance section away from optical axis center line to alleviate the interference of veiling glare to the impact of product performance.
But because transmittance section is also to be formed by light and dark striped, there are light shielding part multiple reflections that the light of small part reflection can be between two code-discs or scattering and arrive other light areas, can affect the purity that is subject to light.In the time that resolution is lower (10-2000P/R), the degree of impact of this veiling glare is relatively little, and still, along with the increase (more than 2000P/R) of resolution, owing to being subject to the decay of light signal, the degree of impact that equal veiling glare brings significantly increases.In other words, rotary encoder resolution, precision are higher, are subject to more segmentation of light signal, larger to the susceptibility of veiling glare.
Utility model content
The utility model is to propose in view of the above problems, and its object is to provide a kind of rotary encoder that can improve with simple structure resolution and precision.
In order to achieve the above object, the utility model provides a kind of rotary encoder, have: light source, the first code-disc, be formed as discoid, be positioned at the below of described light source, and upper surface is perpendicular to the optical axis center line of described light source, on complete cycle, be formed with the first grating and form region, and described the first grating formation region is positioned at the below of the transmission region of described light source, described the first grating region comprises along multiple the first transmittance sections and multiple first light shielding part of the radially alternating configuration of described the first code-disc, the second code-disc, parallel with described the first code-disc, be formed with the second grating in the position corresponding with described the first grating formation region and form region, described the second grating forms region and comprises along multiple the second transmittance sections and multiple second light shielding part of described radially alternating configuration, multiple described the first transmittance sections and multiple described the second transmittance section correspond to each other respectively, and multiple described the first light shielding parts and multiple described the second light shielding part correspond to each other respectively, described rotary encoder is characterised in that, an end upwards, the footpath of a kind of light shielding part in described the first light shielding part and described the second light shielding part is to the distance of described optical axis center line, an end upwards, the footpath that is less than corresponding another kind of light shielding part is to the distance of described optical axis center line, the other end upwards, the footpath of described a kind of light shielding part is to the distance of described optical axis center line, the other end upwards, the footpath that is less than corresponding described another kind of light shielding part is to the distance of described optical axis center line.
Refer to that this said " forming corresponding position, region with described the first grating " at least local and described the first grating forms equitant position, region, " multiple described the first transmittance sections and multiple described the second transmittance section correspond to each other respectively " refers to, multiple described the first transmittance sections and multiple described the second transmittance section are local overlapping at least respectively, " multiple described the first light shielding parts and multiple described the second light shielding part correspond to each other respectively " refers to, multiple described the first light shielding parts and multiple described the second light shielding part are local overlapping at least respectively.
Preferably, in above-mentioned rotary encoder, in multiple described the first transmittance sections, be less than away from described first transmittance section of described optical axis center line length diametrically near described first transmittance section of described optical axis center line length diametrically, in multiple described the second transmittance sections, be less than away from described second transmittance section of described optical axis center line length diametrically near described second transmittance section of described optical axis center line length diametrically.
Preferably, in above-mentioned rotary encoder, described the second code-disc is positioned at the below of described the first code-disc, and described a kind of light shielding part is described the first light shielding part, and described another kind of light shielding part is described the second light shielding part.
Preferably, in above-mentioned rotary encoder, the footpath that the footpath of multiple described the first light shielding parts length is upwards less than or equal to respectively corresponding described the second light shielding part length upwards.
Preferably, in above-mentioned rotary encoder, the footpath that the footpath of multiple described the first light shielding parts length upwards equals respectively corresponding described the second light shielding part length upwards.
Preferably, in above-mentioned rotary encoder, described the first grating forms region and is formed with N described the first transmittance section and N+1 described the first light shielding part, described the second grating forms region and is formed with N described the second transmittance section and N+1 described the second light shielding part, wherein, N is greater than 1 integer, described first grating form region and described second grating form region in described footpath upwards with respect to described optical axis center line symmetry.
Preferably, in above-mentioned rotary encoder, if what send from described light source will be α through described the first transmittance section and the light of second transmittance section and the angle of described optical axis center line corresponding with this first transmittance section, the end of the close described optical axis center line of the first light shielding part being close to this first transmittance section is D to the distance of described optical axis center line
1, the end away from described optical axis center line of this first light shielding part is D ' to the distance of described optical axis center line
1, the end of the close described optical axis center line of second light shielding part corresponding with this first light shielding part is D to the distance of described optical axis center line
2, the end away from described optical axis center line of this second light shielding part is D ' to the distance of described optical axis center line
2, described the first code-disc is d to the distance of described the second code-disc, wherein, and D
2>=D
1+ d × tan α, D '
2≤ D '
1+ d × tan α, described α is more than or equal to 0 ° and be less than or equal to 10 °.
Preferably, in above-mentioned rotary encoder, described α equals 5
°.
According to said structure, grating region adopts the configuration mode of " centripetal shading; centrifugal printing opacity ", can be at the close larger most light disturbance of optical axis center line end isolation strength, again decomposing isolation away from optical axis center line, so just realize isolation and the purification repeatedly of light disturbance light, ensured normal light select and utilize, do not affected the intensity that is effectively subject to light light.
And, because adopting radially, arranges grating region, the design of bringing together along optical axis center line, although make the light diffusion of sending from light source, the light spreading still can arrive object light accepting part, and that has optimized light accepting part is subject to light utilization ratio.And due to the radially centripetal arrangement of grating, large near optical axis center line light intensity, and little outside the length of transmission region and Area Ratio, therefore can make to be subject to photo-equilibrium, make to be subject to light signal on same levelling line, ensured to be subject to intensity and the purity of light signal.Brief description of the drawings
Fig. 1 is the sectional perspective schematic diagram of rotary encoder of the present utility model.
Fig. 2 is the partial schematic sectional view of rotary encoder of the present utility model.
Fig. 3 is the light schematic diagram of the rotary encoder under perfect condition.
Fig. 4 is the light schematic diagram of rotary encoder of the present utility model.
Fig. 5 is the light schematic diagram of rotary encoder in the past.
Embodiment
Below, with reference to accompanying drawing, rotary encoder 1 of the present utility model is described.
Fig. 1 is the sectional perspective schematic diagram of rotary encoder 10, Fig. 2 is the partial schematic sectional view of rotary encoder 10 of the present utility model, Fig. 3 is the light schematic diagram of the rotary encoder under perfect condition, and Fig. 4 is the light schematic diagram of rotary encoder 10 of the present utility model.
As depicted in figs. 1 and 2, rotary encoder 10 has LED11, the first code-disc 12, the second code-disc 13 and the photodiode 14 as photo detector as light source.
LED11 has luminescence chip 110 and lens 111.The light sending from the luminescence chip 110 of LED11 sends after lens 111 refractions.Thereby, in the certain limit below LED11, form light projector region, that is, and the region that the light sending from LED11 can arrive.
As shown in Figure 1, the first code-disc 12 is fixed on central shaft 120, overlooks to observe to be annular, is configured in the below of LED11, can be rotated along with the rotation of central shaft 120.On the complete cycle of the first code-disc 12, the position corresponding with light projector region is diametrically formed with the first grating region 121, and diametrically, the first grating region 121 is with respect to optical axis center line symmetry.
As shown in Figure 2, the first grating region 121 is to be made up of multiple first transmittance sections 122 of arranging along radially alternating and multiple the first light shielding part 123.That is to say, the first grating region 121, radially inner side is the first light shielding part 123 that forms a circle
1, at this first light shielding part 123
1radial outside be form one circle the first transmittance section 122
1, in the first transmittance section 122
1radial outside be form one circle the first light shielding part 123
2, be so followed successively by the first transmittance section 122 to radial outside
2, the first light shielding part 123
3, the first transmittance section 122
3, the first light shielding part 123
4, and optical axis center line is in the first transmittance section 122
2radial center place pass.
Figure 2 illustrates the situation that the first grating region 121 comprises 4 the first light shielding parts and 3 the first transmittance sections, but be not limited to this.Can suitably change according to the width of the size in the light projector region of light source, the first transmittance section and the first light shielding part the quantity of the first transmittance section and the first light shielding part.
And as shown in Fig. 2 and Fig. 4, the optical axis center line of the close light source in multiple the first transmittance sections is (with the L in Fig. 4
14overlap) the first transmittance section than short away from the first transmittance section of optical axis center line length diametrically.
The second code-disc 13 is fixed on not shown framework and can not be rotated, and is positioned at the below of the first code-disc 12, overlooks observation rectangularity.The position corresponding with the first grating region 121 on the second code-disc 13 is formed with the second grating region 131, and wherein, described corresponding position, refers to equitant position in the time overlooking observation.And diametrically, the first grating region 121 is with respect to optical axis center line symmetry.
As shown in Figure 2, the second grating region 131 is to be made up of multiple second transmittance sections 132 of arranging along radially alternating and multiple the second light shielding part 133.That is to say, the second grating region 131, radially inner side is the second light shielding part 133
1, at this second light shielding part 133
1radial outside be the second transmittance section 132
1, in the second transmittance section 132
1radial outside be the second light shielding part 133
2, be so followed successively by the second transmittance section 132 to radial outside
2, the second light shielding part 133
3, the second transmittance section 132
3, the second light shielding part 133
4, and optical axis center line is in the second transmittance section 132
2radial center place pass.
And as shown in Fig. 2 and Fig. 4, the second transmittance section of the optical axis center line of the close light source in multiple the second transmittance sections is shorter than the length diametrically of the second transmittance section away from optical axis center line.
And on above-below direction, multiple the second transmittance sections 132 are corresponding with multiple the first transmittance sections 122 respectively, that is to say, overlooking while observing, the part of multiple the second transmittance sections 132 is at least overlapping with the Local Phase of corresponding the first transmittance section 122.Specifically, on above-below direction, the second transmittance section 132
1with at least local and the first transmittance section 122
1the equitant mode in part and the first transmittance section 122
1corresponding, the second transmittance section 132
2with at least local and the first transmittance section 122
2the equitant mode in part and the first transmittance section 122
2corresponding, the second transmittance section 132
3with at least local and the first transmittance section 122
3the equitant mode in part and the first transmittance section 122
3corresponding.
And on above-below direction, multiple the second light shielding parts 133 are corresponding with multiple the first light shielding parts 123 respectively, that is to say, overlooking while observing, the part of multiple the second light shielding parts 133 is at least overlapping with the Local Phase of corresponding the first light shielding part 123.Specifically, on above-below direction, the second light shielding part 133
1with at least local and the first light shielding part 123
1the equitant mode in part and the first light shielding part 123
1corresponding, the second light shielding part 133
2with at least local and the first light shielding part 123
2the equitant mode in part and the first light shielding part 123
2corresponding, the second light shielding part 133
3with at least local and the first light shielding part 123
3the equitant mode in part and the first light shielding part 123
3corresponding, the second light shielding part 133
4with at least local and the first light shielding part 123
4the equitant mode in part and the first light shielding part 123
4corresponding.
And, the footpath that the footpath of multiple the second light shielding parts 133 length is upwards more than or equal to respectively the first corresponding light shielding part 123 length upwards, and multiple the first light shielding parts 123 position is diametrically than the corresponding more close optical axis center line of the second light shielding part 133.That is to say, diametrically, the first light shielding part 123
1be positioned at the second light shielding part 133
1radial outside, the first light shielding part 123
2be positioned at the second light shielding part 133
2radial outside, the first light shielding part 123
3be positioned at the second light shielding part 133
3radially inner side, the first light shielding part 123
4be positioned at the second light shielding part 133
4radially inner side, claim that this configuration mode of grating region is " centripetal shading, centrifugal printing opacity ".
Figure 2 illustrates the situation that the second grating region 131 comprises 4 the second light shielding parts and 3 the second transmittance sections, but be not limited to this.Can suitably change according to the width of the size in the light projector region of light source, the second transmittance section and the second light shielding part the quantity of the second transmittance section and the second light shielding part.As long as guarantee that multiple the second transmittance sections are corresponding with multiple the first transmittance sections respectively on above-below direction, and multiple the second light shielding part is corresponding with multiple the first light shielding parts respectively.
And as shown in Fig. 2 and Fig. 4, the optical axis center line of the close light source in multiple the second transmittance sections is (with the L in Fig. 4
14overlap) the second transmittance section than short away from the second transmittance section of optical axis center line length diametrically.
Photodiode 14 is fixed on not shown framework and can not be rotated, and is configured in the below of the second code-disc 13.Photodiode 14 has the light area 141 corresponding with the first grating region 121 and the second grating region 131, that is to say, on above-below direction, the Local Phase of light area 141 and the first grating region 121 and the second grating region 131 is overlapping.Light area 141 has along radial array and multiple light accepting part X, Y, Z separated from one another.
And, on above-below direction, light accepting part X, Y, Z are corresponding respectively at multiple the first transmittance sections 122 and multiple the second transmittance section 132, that is to say, overlooking while observing, the part of multiple light accepting part X, Y, Z is at least overlapping with the Local Phase of corresponding the first transmittance section 122 and the second transmittance section 132.
On above-below direction, light accepting part X is with at least local and the first transmittance section 122
1with the second transmittance section 132
1the equitant mode in part and the first transmittance section 122
1with the second transmittance section 132
1corresponding, light accepting part Y is with at least local and the first transmittance section 122
2with the second transmittance section 132
2the equitant mode in part and the first transmittance section 122
2with the second transmittance section 132
2corresponding, light accepting part Z is with at least local and the first transmittance section 122
3with the second transmittance section 132
3the equitant mode in part and the first transmittance section 122
3with the second transmittance section 132
3corresponding.
3,4 pairs of light action situations describe with reference to the accompanying drawings.Fig. 3 is the light schematic diagram of the rotary encoder under perfect condition, and Fig. 4 is the light schematic diagram of rotary encoder of the present utility model.
As shown in Figure 3, under ideal situation, after lens reflection, become light beam parallel to each other from the light beam being sent by the chip of pointolite, here exemplified with light L wherein
1, L
2, L
3, L
4, L
5, light L
1, L
2, L
3, L
4, L
5perpendicular with the upper surface of the first code-disc.Each light L
1, L
2, L
3, L
4, L
5arrive the corresponding light accepting part on photo detector through the corresponding light transmission part on the first code-disc and the second code-disc, wherein, light L
1, L
2arrive light accepting part X, light L
3arrive light accepting part Y, light L
4, L
5arrive light accepting part Z.
But the light in fact sending from chip 110 is not directional light after lens 111 refractions, that is, and the light beam sending from the optical axis center line of LED11, for example light L
14perpendicular with the upper surface of the first code-disc 12, and for example, from the light beam sending away from optical axis center line position of LED11, light L
11, L
12, L
13, L
15, L
16, L
17upper surface out of plumb with the first code-disc 12.That is to say, the light sending from LED11 is to surrounding diffusion type.If the sensing angle of light beam, the optical axis center line angulation of light beam and LED11 is α, and preferably α is 0～10 °, and especially preferably α is 5 °.
As shown in Figure 4, if the light beam sending from LED11 (light shown in thick arrow), through the first residing region of light shielding part, can not arrived the light accepting part that should not arrive by the first light shielding part reflection.
Because the first light shielding part is than the corresponding more close optical axis center line of the second light shielding part, so reflected away by the second light shielding part through the veiling glare (light shown in the dotted arrow in figure) of reflection between the first light shielding part and corresponding the second light shielding part, and can not arrive the light accepting part that should not arrive.
The light L sending from LED11
11, L
12successively through the first transmittance section 122
3, the second transmittance section 132
3and arrival light accepting part Z, light L
13, L
14, L
15successively through the first transmittance section 122
2, the second transmittance section 132
2and arrival light accepting part Y, light L
16, L
17successively through the first transmittance section 122
1, the second transmittance section 132
1and arrival light accepting part X.
If the first light shielding part 123
3the end of radially inner side (below referred to as the first light shielding part 123
3medial extremity) be D to the distance of optical axis center line
1, the first light shielding part 123
3the end of radial outside (below referred to as the first light shielding part 123
3outboard end) be D ' to the distance of optical axis center line
1, the second light shielding part 133
3the end of radially inner side (below referred to as the second light shielding part 133
3medial extremity) be D to the distance of optical axis center line
2, the second light shielding part 133
3the end of radial outside (below referred to as the second light shielding part 133
3outboard end) be D ' to the distance of optical axis center line
2, the distance between the first code-disc 12 and the second code-disc 13 is d, and, because the thickness of the first code-disc 12 and the second code-disc 13 is very little, do not consider the thickness of the first code-disc 12 and the second code-disc 13 at this.
Light L
13be, be to be close to the first light shielding part 123
3the mode of medial extremity through the first transmittance section 122
2, and then to be close to the second light shielding part 133
3the mode of medial extremity through the second transmittance section 132
2, finally arrive the light of light accepting part Y, meet following formula.
D
2≥D
1+d×tanα （1）
In reality, design with α=5 °.
Light L
12be, be to be close to the first light shielding part 123
3the mode of outboard end through the first transmittance section 122
3, and then to be close to the second light shielding part 133
3the mode of outboard end through the second transmittance section 132
3, finally arrive the light of light accepting part Z, meet following formula.
D’
2≤D’
1+d×tanα （2）
In reality, design with α=5 °.
Above, be with light L
12, L
13for example is illustrated, but other light also meet above-mentioned formula (1), (2).
According to above-mentioned embodiment, because grating region adopts the configuration mode of " centripetal shading, centrifugal printing opacity ", formed thus one centered by optical axis center line to the diffusion tendency away from optical axis center beta radiation; In other words, due to the closer to optical axis center line end, the illumination of light is stronger, that is to say the closer to optical axis center line end light source and is the state of bringing together.Utilize this point can be near the larger most light disturbance of optical axis center line end isolation strength, and can again decompose isolation away from optical axis center line by light and dark grating fringe multiple reflections or the light of refraction (light shown in dotted arrow), so just realize isolation and the purification repeatedly of light disturbance light, ensure normal light select and utilize, do not affected the intensity that is effectively subject to light light.
And, because adopting radially, arranges grating region, the design of bringing together along optical axis center line, although make the light diffusion of sending from light source, the light spreading still can arrive object light accepting part, and that has optimized light accepting part is subject to light utilization ratio.And due to the radially centripetal arrangement of grating, large near optical axis center line light intensity, and little outside the length of transmission region and Area Ratio, therefore can make to be subject to photo-equilibrium, make to be subject to light signal on same levelling line, ensured to be subject to intensity and the purity of light signal.
In above-mentioned embodiment, illustrated that the first code-disc 12 is positioned at the situation of the top of the second code-disc 13, but the utility model is not limited to this, also can make second code dish be positioned at the top of the first code-disc.
In the case of the second code-disc be positioned at the first code-disc above, an end upwards, the footpath of the second light shielding part is to the distance of optical axis center line, an end upwards, the footpath that is less than the first corresponding light shielding part is to the distance of optical axis center line, the other end upwards, the footpath of the second light shielding part is to the distance of optical axis center line, and the other end upwards, the footpath that is less than the first corresponding light shielding part is to the distance of optical axis center line.
By specific embodiment, the utility model is illustrated, but is not limited to this, protection domain of the present utility model is as the criterion with claims, as long as in the scope of claims, can carry out various distortion and omission.
Claims (13)
1. a rotary encoder,
Have:
Light source,
The first code-disc, be formed as discoid, be positioned at the below of described light source, and upper surface is perpendicular to the optical axis center line of described light source, on complete cycle, be formed with the first grating and form region, and described the first grating formation region is positioned at the below of the transmission region of described light source, and described the first grating region comprises along multiple the first transmittance sections and multiple first light shielding part of the radially alternating configuration of described the first code-disc
The second code-disc, parallel with described the first code-disc, be formed with the second grating in the position corresponding with described the first grating formation region and form region, described the second grating forms region and comprises along multiple the second transmittance sections and multiple second light shielding part of described radially alternating configuration
Multiple described the first transmittance sections and multiple described the second transmittance section correspond to each other respectively, and multiple described the first light shielding part and multiple described the second light shielding part correspond to each other respectively,
Described rotary encoder is characterised in that,
An end upwards, the footpath of a kind of light shielding part in described the first light shielding part and described the second light shielding part is to the distance of described optical axis center line, and an end upwards, the footpath that is less than corresponding another kind of light shielding part is to the distance of described optical axis center line,
The other end upwards, the footpath of described a kind of light shielding part is to the distance of described optical axis center line, and the other end upwards, the footpath that is less than corresponding described another kind of light shielding part is to the distance of described optical axis center line.
2. rotary encoder as claimed in claim 1, is characterized in that,
In multiple described the first transmittance sections, be less than away from described first transmittance section of described optical axis center line length diametrically near described first transmittance section of described optical axis center line length diametrically,
In multiple described the second transmittance sections, be less than away from described second transmittance section of described optical axis center line length diametrically near described second transmittance section of described optical axis center line length diametrically.
3. rotary encoder as claimed in claim 1, is characterized in that,
Described the second code-disc is positioned at the below of described the first code-disc, and described a kind of light shielding part is described the first light shielding part, and described another kind of light shielding part is described the second light shielding part.
4. rotary encoder as claimed in claim 2, is characterized in that,
Described the second code-disc is positioned at the below of described the first code-disc, and described a kind of light shielding part is described the first light shielding part, and described another kind of light shielding part is described the second light shielding part.
5. rotary encoder as claimed in claim 3, is characterized in that,
The footpath that the footpath of multiple described the first light shielding parts length is upwards less than or equal to respectively corresponding described the second light shielding part length upwards.
6. rotary encoder as claimed in claim 4, is characterized in that,
The footpath that the footpath of multiple described the first light shielding parts length is upwards less than or equal to respectively corresponding described the second light shielding part length upwards.
7. rotary encoder as claimed in claim 5, is characterized in that,
The footpath that the footpath of multiple described the first light shielding parts length upwards equals respectively corresponding described the second light shielding part length upwards.
8. rotary encoder as claimed in claim 6, is characterized in that,
The footpath that the footpath of multiple described the first light shielding parts length upwards equals respectively corresponding described the second light shielding part length upwards.
9. the rotary encoder as described in any one in claim 1～8, is characterized in that,
Described the first grating forms region and is formed with N described the first transmittance section and N+1 described the first light shielding part,
Described the second grating forms region and is formed with N described the second transmittance section and N+1 described the second light shielding part,
Wherein, N is greater than 1 integer,
Described first grating form region and described second grating form region in described footpath upwards with respect to described optical axis center line symmetry.
10. the rotary encoder as described in any one in claim 3～8, is characterized in that,
If what send from described light source will be α through described the first transmittance section and the light of second transmittance section and the angle of described optical axis center line corresponding with this first transmittance section, the end of the close described optical axis center line of the first light shielding part being close to this first transmittance section is D to the distance of described optical axis center line
1, the end away from described optical axis center line of this first light shielding part is D ' to the distance of described optical axis center line
1, the end of the close described optical axis center line of second light shielding part corresponding with this first light shielding part is D to the distance of described optical axis center line
2, the end away from described optical axis center line of this second light shielding part is D ' to the distance of described optical axis center line
2, described the first code-disc is d to the distance of described the second code-disc, wherein,
D
2≥D
1+d×tanα
D’
2≤D’
1+d×tanα，
Described α is more than or equal to 0 ° and be less than or equal to 10 °.
11. rotary encoders as claimed in claim 9, is characterized in that,
If what send from described light source will be α through described the first transmittance section and the light of second transmittance section and the angle of described optical axis center line corresponding with this first transmittance section, the end of the close described optical axis center line of the first light shielding part being close to this first transmittance section is D to the distance of described optical axis center line
1, the end away from described optical axis center line of this first light shielding part is D ' to the distance of described optical axis center line
1, the end of the close described optical axis center line of second light shielding part corresponding with this first light shielding part is D to the distance of described optical axis center line
2, the end away from described optical axis center line of this second light shielding part is D ' to the distance of described optical axis center line
2, described the first code-disc is d to the distance of described the second code-disc, wherein,
D
2≥D
1+d×tanα
D’
2≤D’
1+d×tanα，
Described α is more than or equal to 0 ° and be less than or equal to 10 °.
12. rotary encoders as claimed in claim 10, is characterized in that, described α equals 5 °.
13. rotary encoders as claimed in claim 11, is characterized in that, described α equals 5 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420050817.5U CN203772286U (en) | 2014-01-26 | 2014-01-26 | Rotary encoder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420050817.5U CN203772286U (en) | 2014-01-26 | 2014-01-26 | Rotary encoder |
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| Publication Number | Publication Date |
|---|---|
| CN203772286U true CN203772286U (en) | 2014-08-13 |
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ID=51289468
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|---|---|---|---|
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|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108571992A (en) * | 2017-03-09 | 2018-09-25 | 曾吉旺 | Optical scanner formula double layer light-guiding encoder |
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2014
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108571992A (en) * | 2017-03-09 | 2018-09-25 | 曾吉旺 | Optical scanner formula double layer light-guiding encoder |
| CN108571992B (en) * | 2017-03-09 | 2020-04-21 | 曾吉旺 | Optical scanning type double-layer light guide encoder |
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