CN102589589A - Optical encoder - Google Patents
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- CN102589589A CN102589589A CN2012100634864A CN201210063486A CN102589589A CN 102589589 A CN102589589 A CN 102589589A CN 2012100634864 A CN2012100634864 A CN 2012100634864A CN 201210063486 A CN201210063486 A CN 201210063486A CN 102589589 A CN102589589 A CN 102589589A
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Abstract
The invention provides an optical encoder including an optical disc, a shaft, a light source and a sensor. The optical disc is provided with a first surface, a second surface opposite to the first surface, a side surface connected between the first surface and the second surface and a plurality of first optical structures distributed on the first surface. The shaft is disposed at the center of the optical disc, wherein the optical disc uses the shaft as a rotation axis. The light source is positioned on one side of the side surface, wherein the light source provides light rays transmitted towards the side surface. The sensor is arranged on one side of the optical disc to receive the light emitted from the first surface, wherein the first surface is positioned between the second surface and the sensor.
Description
[technical field]
The invention relates to a kind of optical encoder (optical encoder), and particularly about a kind of optical encoder with optical disc of optical texture.
[background technology]
At present, in order accurately to grasp the rotation situation of motor, prior art can install optical encoder additional in motor inside.Optical encoder is to be made up of optical disc, light source and an OPTICAL SENSORS that is carved with specific message.Generally speaking; Have a plurality of periodic arrangement perforates that can let light pass through on the optical disc, when optical disc was rotated, OPTICAL SENSORS can receive the light signal with specific period property; At this moment, optical encoder just can be judged the rotating speed and the amount of spin of motor according to this light signal.
In existing optical encoder, optical disc is metal or glass material normally, and the optics of metals dish is to form through the electroforming mode, and the perforate on the optical disc normally forms through etching mode.Though the optical disc of metal and glass material has good heatproof characteristic and very long serviceable life, utilize electroforming and optical disc that etch process forms on making, to need higher cost.In addition; Optical disc compared to metal and glass material; Light source in the optical encoder (for example being light emitting diode) has short serviceable life and relatively poor resistance to extreme temperature, and therefore, employed light source kind usually can be limited to the range of application of optical encoder.
Hold above-mentionedly, how to reduce the manufacturing cost of optical encoder and prolong serviceable life of light source, desire most ardently one of problem of solution in fact for present research staff.
[summary of the invention]
The present invention provides a kind of optical encoder, and it utilizes the optical texture on the optical disc to strengthen output light intensity, and then promotes the light service efficiency and reduce the light emitting diode power demand, reaches the effect that prolongs light source life.
The present invention provides a kind of optical encoder to comprise an optical disc, a plurality of first optical texture that is distributed in this first surface, one, a light source and a sensor.Optical disc have a first surface, one and first surface opposing second surface, be connected in the side surface between first surface and the second surface.Axle is arranged at the center of optical disc, in order to the axis of rotation as optical disc.Light source is positioned at a side of side surface, and wherein light source is in order to provide the light towards the side surface transmission.Sensor configurations is in a side of optical disc, and in order to receive the light that penetrates from first surface, wherein first surface is between second surface and sensor.
In one embodiment of this invention, aforesaid first optical texture is arranged along at least one circular path, and the center of circle of each circular path overlaps with the center of optical disc.
In one embodiment of this invention, aforesaid optical disc has a plurality of second optical textures that are disposed at side surface, and second optical texture is a concentration structure, and in order to converging light, and second optical texture disposes corresponding to first optical texture.
In one embodiment of this invention, aforesaid optical disc has a plurality of the 3rd optical textures that are positioned on the second surface.
In one embodiment of this invention, aforesaid the 3rd optical texture is a light guide structure, in order to the light of guiding from side surface beam incident optical dish, makes the turn light rays first surface transmission from side surface beam incident optical dish.
In one embodiment of this invention, aforesaid first optical texture has a lightproof area and a transmission region, uses so that optical disc when rotating as axis of rotation with axle, and sensor measures the caused periodic intensity degree of first optical texture to be changed.
The present invention provides a kind of optical encoder to comprise an optical disc, one, a light source, a plurality of first optical texture, a plurality of second optical texture and a sensor in addition.Optical disc have a first surface, one and first surface opposing second surface and be connected in the side surface between first surface and the second surface.Axle is arranged at the center of optical disc, in order to the axis of rotation as this optical disc.Light source is arranged at a side of optical disc, so that the light towards the optical disc transmission to be provided.A plurality of first optical textures are disposed on the optical disc, in order to the light of reception towards the optical disc transmission, and the light extraction efficiency of increase optical disc.A plurality of second optical textures are disposed on the optical disc, use so that the light that optical disc penetrates produces periodic the variation.Sensor is positioned at a side of optical disc, in order to receive the light that optical disc penetrates.
In one embodiment of this invention, aforesaid first optical texture is the part of a cylinder, a polygonal vertebra or a hemisphere.
In one embodiment of this invention, aforesaid sensor and light source are positioned at the same side or the relative both sides of optical disc.
In one embodiment of this invention, aforesaid light source is positioned at a side of side surface, and wherein light source is in order to provide the light towards the side surface transmission.
In one embodiment of this invention, aforesaid optical encoder more comprises a reflecting element, and wherein reflecting element is arranged at the opposite side of optical disc with respect to sensor.
In one embodiment of this invention, aforesaid optical disc is a macromolecular material.
Based on above-mentioned, the optical texture on the optical encoder of the present invention optical disc capable of using increases the deviation and the reflectivity of light, promotes the light that imports sensor, promotes the light utilization rate by this, and reduces the required brightness of light source bright dipping.That is to say,, reduce the light source output current, cause the damage of light source to reduce temperature, and further promote the life-span of light source through promoting the light utilization rate.
For letting the above-mentioned feature and advantage of the present invention can be more obviously understandable, hereinafter is special lifts embodiment, and cooperates appended graphic elaborating as follows.
[description of drawings]
Figure 1A is the schematic side view of the optical encoder of the first embodiment of the present invention.
Figure 1B is for looking synoptic diagram on the optical disc among Figure 1A.
Fig. 1 C changes synoptic diagram for the periodic intensity degree that sensor measured among Figure 1A.
Fig. 2 is the schematic side view of the optical encoder of another embodiment of the present invention.
Fig. 3 is the schematic side view of the optical encoder of further embodiment of this invention.
Fig. 4 A is the schematic side view of the optical encoder of yet another embodiment of the invention.
Fig. 4 B is for looking synoptic diagram on the optical disc among Fig. 4 A.
Fig. 4 C changes synoptic diagram for the periodic intensity degree that sensor measured among Fig. 4 A.
Fig. 5 A to Fig. 5 F is that light extraction efficiency strengthens structure embodiment synoptic diagram.
Fig. 6 strengthens structure penetrates angle in difference light extraction efficiency graph of a relation for light extraction efficiency.
Fig. 7 is a light extraction efficiency method for measurement synoptic diagram.
[main element symbol description]
100,200,300,400: optical encoder
110,210,310,410,720: optical disc
710: light extraction efficiency strengthens structure
112,212,312,412,412a, 412b, 412c: first optical texture
114,214,314: the second optical textures
116,416,416a, 416b, 416c: the 3rd optical texture
120,420: axle
130,230,330,430: light source
140,240,340,440,440a, 140b, 440c: sensor
250: reflecting element
112 (A1), 412a (A1), 412b (A1), 412c (A1): lightproof area
112 (A2), 412a (A2), 412b (A2), 412c (A2): transmission region
A, 440a (a), 440b (a), 440c (a): big relatively value
B, 440a (b), 440b (b), 440c (b): relatively little value
S1, S1 ': first surface
S2, S2 ': second surface
S3, S3 ': side surface
L1, L2, L1 ', L2 ', L2a, L2b, L2c: light
α, β: angle
[embodiment]
Figure 1A is the schematic side view of the optical encoder of the first embodiment of the present invention.Figure 1B is for looking synoptic diagram on the optical disc among Figure 1A.
Please with reference to Figure 1A and Figure 1B, the optical encoder 100 of present embodiment comprises optical disc 110, axle 120, light source 130 and sensor 140.In the present embodiment, optical disc 110 for example is discoid optical disc.In addition, the material of optical disc 110 for example be polycarbonate (Polycarbonate, PC) or acryl (Polymethyl methacrylate, PMMA) or reach the gram synthetic fibre (Polyethylene terephthalate PET) waits transparent polymer material.Particularly, optical disc 110 has first surface S1, and first surface S1 opposing second surface S2, is connected in side surface S3 and a plurality of first optical texture 112 that is distributed in first surface S1 between first surface S1 and the second surface S2.
In addition, optical disc 110 more comprises a plurality of second optical texture 114 and a plurality of the 3rd optical textures 116 that are positioned on the second surface S2 that are disposed at side surface S3.Second optical texture 114 is corresponding to 112 configurations of first optical texture.And above-mentioned first optical texture 112, second optical texture 114 and the 3rd optical texture 116 are all in order to the direction of transfer (comprise and stop advancing of light) that changes light and/or change light intensity.For example, first optical texture 112, second optical texture 114 and the 3rd optical texture 116 can be in order to deviation, guide and/or converge light.In the present embodiment; Second optical texture 114 is to be used for increasing light L1 to get into the ratio in the optical disc 110; First optical texture 112 is to be used for deviation to advance like the light L1 in the optical disc 110, and the 3rd optical texture 116 is to be used for increasing light L2 by the ratio of sensor 140.But in the embodiment of the invention; The collocation of above-mentioned first optical texture 112, second optical texture 114 and the 3rd optical texture 116 is not in order to restriction the present invention; Exposure according to the embodiment of the invention; The technician should do suitable modification, and for example: first optical texture 112 is that to be used for that deviation advances like the light L1 in the optical disc 110, second optical texture 114 be to be used for increasing light L1 to get into ratio, the 3rd optical texture 116 in the optical disc 110 be that light guide structure is used for guiding the light L1 that gets into optical disc 110 and turns to the first surface transmission.
In addition; The shape of first optical texture 112, second optical texture 114 and the 3rd optical texture 116 can be V-type groove, lenticule, prism, cylinder, semicircle, pyramid, planar structure and combination thereof, and is not restricted to protrusion or is depressed in the basic plane of optical disc 110.In the present embodiment, first optical texture 112 for example is prism (prism), and second optical texture 114 for example is V-type groove (v-cut groove), and the 3rd optical texture 116 for example is lenticule (micro-lens).
In the present embodiment, light source 130 for example is a light emitting diode.In addition, light source 130 for example is a side that is positioned at side surface S3.In the type of optical encoder, the configuration that this kind light source 130 is positioned at optical disc 110 sides is called side and goes into the type optical encoder.Particularly, light source 130 is in order to provide a light L1 towards side surface S3 transmission.In addition; Sensor 140 is disposed at a side (for example top) of optical disc 110; To receive the light L2 that penetrates from first surface S1; Wherein first surface S1 is between second surface S2 and sensor 140, and wherein light L1 gets into optical disc 110 by side surface S3, and penetrates optical disc 110 near a side of sensor 140 by optical disc 110.
More specifically, rotate the demand of the number of turns in order to judge optical disc 110, first optical texture 112 has more lightproof area 112 (A1) and transmission region 112 (A2).In addition, its shading ratio of lightproof area 112 (A1) is greater than 0 and smaller or equal to 100%, and its penetrability is lower than transmission region 112 (A2).Please with reference to Fig. 1 C, by this, when optical disc 110 was the axis of rotation rotation with axle 120, sensor 140 can measure on first optical texture 112 and changed by the caused periodic intensity degree of lightproof area 112 (A1) and transmission region 112 (A2).And change through this periodic intensity degree, can further calculate rotating speed and the amount of spin of optical disc 110 etc., wherein a is the big relatively value of periodic intensity variation, b is the relatively little value of periodic intensity variation.
In addition, light intensity peak value (for example being big relatively value a and relatively little value b among Fig. 1 C) is relevant with the shape of optical texture design, through the shape of modulation optical texture, can record varying photonic intensities and change.Particularly, through the shape of modulation optical texture, but the received light intensity of optimization sensor 140.And when light intensity is enough high; When that is to say the losing quantity reduction of light in the light transmittance process; Then can be through reducing the input current of light emitting diode; The temperature of light emitting diode is significantly reduced, and then promote the life-span of light emitting diode, perhaps reach the purpose that reduces 140 consumed powers of sensor.
Except above-mentioned side was gone into type single channel optical encoder, optical encoder of the present invention also can be reflection-type single channel optical encoder, and its optical design Fig. 2 that will arrange in pairs or groups describes.
Fig. 2 is the schematic side view of the optical encoder of another embodiment of the present invention.Please with reference to Fig. 2, the optical encoder 200 of present embodiment comprises optical disc 210, axle (having analog structure and function with Figure 1B, please with reference to Figure 1B), light source 230, a plurality of first optical texture 212, a plurality of second optical texture 214 and sensor 240.In the present embodiment, the material of optical disc 210 for example is transparent polymer materials such as polycarbonate, acryl or PET.Particularly, optical disc 210 have first surface S1 ', and first surface S1 ' opposing second surface S2 ' and be connected in first surface S1 ' and second surface S2 ' between side surface S3 '.
In the present embodiment, a plurality of first optical textures 212 are disposed at the first surface S1 ' on the optical disc 210, in order to the light L1 ' of reception towards optical disc 210 transmission, and the light extraction efficiency of increase optical disc 210.Particularly, first optical texture 212 for example is a hemisphere.Yet in other embodiments, first optical texture 212 also can be cylinder.In addition, the hemisphere of indication means that its geometry is the some of spheroid here, and the application's case does not limit half the (50%) that aforesaid hemispheroidal volume is necessary for the spheroid volume.
In the present embodiment, a plurality of second optical textures 214 are disposed on the optical disc 210, and are positioned at a side of first optical texture 212.In addition, the shape of second optical texture 214 can be V-type groove, lenticule, corner post, cylinder, semicircle, pyramid and combination thereof, and is not restricted to the basic plane of protruding or being depressed in optical disc 210.Particularly, second optical texture 214 is main with periodically changing (its effect for example is shown in Fig. 1 C, so repeat no more) so that the light that optical disc 210 penetrates produces.
In the present embodiment, though second optical texture 214 and first optical texture 212 are illustrated in Fig. 2 with difformity, yet on practice, second optical texture 214 also can be similar or the same structure with first optical texture 212.
In the present embodiment, light source 230 is arranged at a side (for example top) of optical disc 210, and in order to a light L1 ' towards optical disc 210 transmission to be provided, wherein first surface S1 ' is positioned between second surface S2 ' and the light source 230.In addition, sensor 240 is positioned at the homonymy of optical disc 210 and light source 230, in order to receive the light L2 ' that optical disc 210 penetrates.
In addition, in the present embodiment, optical disc 210 more comprises a reflecting element 250, this reflecting element 250 for example be by polyethylene terephthalate (Polyethylene terephthalate, PET), material such as polymeric membrane or metal forms.Particularly, the reflectivity of reflecting element 250 for example is greater than 85%.In addition, reflecting element 250 is arranged on the second surface S2 ' of optical disc 210, for example be to be made up with macromolecule emplastic or other breasting mechanisms, but the present invention is not as limit.In the type of optical encoder, have the characteristic persons such as homonymy that reflecting element 250 and light source 230 are disposed at optical disc 210, be called reflective optical encoder.
In addition, the light L1 ' that is sent when light source 230 is passed to first surface S1 ', and first optical texture 212 on the first surface S1 ' imports optical disc 210 with light L1 ', and light L1 ' is transmitted towards second surface S2 '.At this moment, the reflecting element 250 that is positioned at second surface S2 ' is suitable for the reflection with light L1 ', and light L1 ' is transmitted towards first surface S1 '.Then, second optical texture 214 that is positioned on the first surface S1 ' can be derived optical disc 210 with light L2 ' effectively, to increase light L2 ' by the ratio of sensor 240 acquisitions.In addition, second optical texture 214 that is positioned on the first surface S1 ' can make sensor 240 capture periodically variable light intensity, uses and judges optical disc 210 rotating speeds and amount of spin.
In addition, except above-mentioned side was gone into type and reflection-type single channel optical encoder, optical encoder of the present invention also can be penetrating type single channel optical encoder, and its optical design Fig. 3 that will arrange in pairs or groups describes.
Fig. 3 is the schematic side view of the optical encoder of further embodiment of this invention.Please with reference to Fig. 3; In the present embodiment; Optical encoder 300 is similar with the optical encoder 200 among Fig. 2; Only the two main difference be in: in the optical encoder 300 of present embodiment, sensor 340 is positioned at the relative both sides of optical disc 310 and light source 330, and second optical texture 314 is positioned on the second surface S2 '.In addition, optical disc 310 need not have reflecting element 250.In the type of optical encoder, this kind light source 330 and optical disc 310 are positioned at the configuration of relative both sides, are called the penetrating type optical encoder.
In detail, the light L1 ' that is sent when light source 330 is passed to first surface S1 ', and first optical texture 312 on the first surface S1 ' imports optical disc 310 with light L1 ', and light L1 ' is transmitted towards second surface S2 '.At this moment, second optical texture 314 that is positioned at second surface S2 ' can be derived optical disc 310 with light L2 ' effectively, to increase light L2 ' by the ratio of sensor 340 acquisitions.In addition, second optical texture 314 that is positioned on the second surface S2 ' can make sensor 340 capture periodically variable light intensity, uses and judges optical disc 210 rotating speeds and amount of spin.
Except above-mentioned side is gone into type, reflection-type and penetrating type single channel optical encoder; The optical encoder of the application's case also can be the hyperchannel optics scrambler that side is gone into type, reflection-type and penetrating type, and will arrange in pairs or groups Fig. 4 A, Fig. 4 B and Fig. 4 C of its detailed content describes.
Fig. 4 A is the schematic side view of the optical encoder of yet another embodiment of the invention.Please with reference to Fig. 4 A; The optical encoder 400 of present embodiment is similar with the optical encoder 100 among Figure 1A; Only the two main difference be in: the quantity of sensor 440 is a plurality of; And first optical texture 412 is divided into 3 crowds of 412a, 412b, 412c, and these 3 crowds first optical texture 412a, 412b, 412c arrange (3 Channel Design) along 3 circular paths respectively.In addition, the 3rd optical texture 416 also distributes, and divides into 3 crowds of 416a, 416b, 416c corresponding to aforementioned 3 crowds first optical texture 412a, 412b, 412c.In addition, the present application is not limited to the first group of optical structure 412, and the third optical structure 416 is the number of groups and the number of sensors 440, the knowledge in this area, by having a generally disclosed in accordance with the present invention embodiment Teaching with shows, visual design needs to change the group of the first optical structure 412, and the third optical structure 416, the number of clusters as well as the number of sensors 440.
(Fig. 1～Fig. 3), the hyperchannel optics scrambler 400 of present embodiment can accurately determine the absolute position compared to the single channel optical encoder.Get over for a long time when the port number that is adopted, optical disc 410 just can be judged the absolute position more accurately.
Please with reference to Fig. 4 B and Fig. 4 C; The lightproof area 412a (A1) of the first optical texture 412a, 412b and the 412c of distinct group, 412b (A1) and 412c (A1) and transmission region 412a (A2), 412b (A2) and 412c (A2) can have three kinds of periodic arrangement modes; So that light L2a, L2b, L2c demonstrate the intensity variation (shown in Fig. 4 C) of 3 kinds of different cycles property respectively; Wherein 440a (a), 440b (a), 440c (a) are the big relatively value of periodic intensity variation, and 440a (b), 440b (b), 440c (b) are the relatively little value of periodic intensity variation.
Fig. 5 A to Fig. 5 F is that light extraction efficiency strengthens structure embodiment synoptic diagram.Please with reference to Fig. 5 A to Fig. 5 F; Various optical textures among Fig. 5 A to Fig. 5 F; Can be in order to receiving the emergent light that light source 130, light source 230, light source 330 and light source 430 etc. are provided, and make emergent light through behind the above-mentioned optical texture, can and then improve irradiant light extraction efficiency.
Improve irradiant light extraction efficiency for clearly demonstrating the above-mentioned optical texture that utilizes, below will arrange in pairs or groups Fig. 6 and Fig. 7 explain.Fig. 6 strengthens the light extraction efficiency graph of a relation of structure in difference ejaculation angle for light extraction efficiency, and Fig. 7 is a light extraction efficiency method for measurement synoptic diagram.With reference to Fig. 7; When incident light L1 is after 0 degree (that is vertical incidence) is injected light extraction efficiency enhancing structure 710 by incident angle α; After light extraction efficiency enhancing structure 710 and optical disc 720; Each angle of emergence β that strengthens the opposite side of structure 710 in optical disc 720 with respect to light extraction efficiency measures the intensity that penetrates light L2, and wherein light extraction efficiency is defined as:
Light extraction efficiency=ejaculation light L2 intensity/incident light L1 intensity.
Please with reference to Fig. 6; Wherein 610 is the light extraction efficiency curve that Fig. 5 A optical efficiency strengthens structure; And 620 be the light extraction efficiency curve that Fig. 5 C optical efficiency strengthens structure, can find that if in suitable angle sensor is set, its light extraction efficiency can reach more than 70 of percentage.
Above-mentioned optical disc with hyperchannel design is gone in the type optical encoder except being applied in side, also can be applicable in reflective optical encoder and the penetrating type optical encoder.
In sum, the application's case forms optical disc with transparent polymer material, can reduce the processing procedure cost of optical disc, and reaches easily than electroforming and etch process technically.In addition; Optical texture on the optical disc can more effectively be directed to sensor with the light that light emitting diode is exported; Because the light utilization efficiency of light source is raised, so light source has an opportunity to work under the lower operating temperature again, and its serviceable life can be by further lifting.In addition, the embodiment of the invention discloses side and goes into the type optical encoder, because light source is arranged at the side of optical disc, therefore can dwindle the thickness of scrambler.
Though the present invention discloses as above with embodiment; Right its is not in order to limit the present invention; Has common knowledge the knowledgeable in the technical field under any; Do not breaking away from the spirit and scope of the present invention, when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (11)
1. optical encoder comprises:
One optical disc, have a first surface, one and this first surface opposing second surface, one be connected in the side surface between this first surface and this second surface;
A plurality of first optical textures that are distributed in this first surface;
One, be arranged at the center of this optical disc, in order to axis of rotation as this optical disc;
One light source is positioned at a side of this side surface, and wherein this light source is in order to provide the light that transmits towards this side surface; And
One sensor is disposed at a side of this optical disc, and in order to receive the light that penetrates from this first surface, wherein this first surface is between this second surface and this sensor.
2. optical encoder according to claim 1 is characterized in that, those first optical textures are arranged along at least one circular path, and respectively the center of circle of this circular path overlaps with the center of this optical disc.
3. optical encoder according to claim 1; It is characterized in that this optical disc has a plurality of second optical textures that are disposed at this side surface, this second optical texture is a concentration structure; In order to converging light, and those second optical textures are corresponding to those first optical textures configurations.
4. optical encoder according to claim 3 is characterized in that, this optical disc has a plurality of the 3rd optical textures that are positioned on this second surface.
5. optical encoder according to claim 4 is characterized in that, those the 3rd optical textures are a light guide structure, in order to the light of guiding from this this optical disc of side surface incident, makes the turn light rays first surface transmission from this this optical disc of side surface incident.
6. optical encoder according to claim 1; It is characterized in that; This first optical texture has a lightproof area and a transmission region, uses so that this optical disc when rotating as axis of rotation with this axle, and this sensor measures the caused periodic intensity degree of this first optical texture to be changed.
7. optical encoder comprises:
One optical disc, have a first surface, one and this first surface opposing second surface and one be connected in the side surface between this first surface and this second surface;
One, be arranged at the center of this optical disc, in order to axis of rotation as this optical disc;
One light source is arranged at a side of this optical disc, so that the light that transmits towards this optical disc to be provided;
A plurality of first optical textures are disposed on this optical disc, in order to receiving the light that this transmits towards this optical disc, and increase the light extraction efficiency of this optical disc;
A plurality of second optical textures are disposed on this optical disc, use so that the light that this optical disc penetrates produces periodic the variation; And
One sensor is positioned at a side of this optical disc, in order to receive the light that this optical disc penetrates.
8. optical encoder according to claim 7 is characterized in that, this first optical texture is the part of a cylinder, a polygonal vertebra or a hemisphere.
9. optical encoder according to claim 7 is characterized in that, this sensor and this light source are positioned at the same side or the relative both sides of this optical disc.
10. optical encoder according to claim 7 it is characterized in that, and this light source is positioned at a side of this side surface, and wherein this light source is in order to provide the light towards this side surface transmission.
11. optical encoder according to claim 7 is characterized in that, more comprises a reflecting element, wherein this reflecting element is arranged at the opposite side of this optical disc with respect to this sensor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100147191A TWI451067B (en) | 2011-12-19 | 2011-12-19 | Optical encoder |
| TW100147191 | 2011-12-19 |
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| CN102589589A true CN102589589A (en) | 2012-07-18 |
| CN102589589B CN102589589B (en) | 2015-01-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022105042A1 (en) * | 2020-11-20 | 2022-05-27 | 广东瑞讯电子科技有限公司 | Optical encoder assembly |
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| CN1059402A (en) * | 1990-08-25 | 1992-03-11 | 中国科学院长春光学精密机械研究所 | Absolute shaft-position encoder design method and encoder |
| DE19511474A1 (en) * | 1994-03-31 | 1995-10-05 | Siemens Comp Inc | Optical encoder e.g. for rotating shaft |
| JP2004340929A (en) * | 2003-04-21 | 2004-12-02 | Mitsubishi Electric Corp | Optical rotary encoder |
| CN1740752A (en) * | 2004-08-25 | 2006-03-01 | 安捷伦科技有限公司 | Optical encoding that utilizes total internal reflection |
| US20110272566A1 (en) * | 2009-02-03 | 2011-11-10 | Leica Geosystems Ag | Optoelectronic position measurement device and optoelectronic position measurement method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5111031B2 (en) * | 2007-09-14 | 2012-12-26 | キヤノン株式会社 | Displacement detection method and motor control device |
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| CN1059402A (en) * | 1990-08-25 | 1992-03-11 | 中国科学院长春光学精密机械研究所 | Absolute shaft-position encoder design method and encoder |
| DE19511474A1 (en) * | 1994-03-31 | 1995-10-05 | Siemens Comp Inc | Optical encoder e.g. for rotating shaft |
| JP2004340929A (en) * | 2003-04-21 | 2004-12-02 | Mitsubishi Electric Corp | Optical rotary encoder |
| CN1740752A (en) * | 2004-08-25 | 2006-03-01 | 安捷伦科技有限公司 | Optical encoding that utilizes total internal reflection |
| US20110272566A1 (en) * | 2009-02-03 | 2011-11-10 | Leica Geosystems Ag | Optoelectronic position measurement device and optoelectronic position measurement method |
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| WO2022105042A1 (en) * | 2020-11-20 | 2022-05-27 | 广东瑞讯电子科技有限公司 | Optical encoder assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI451067B (en) | 2014-09-01 |
| TW201326761A (en) | 2013-07-01 |
| CN102589589B (en) | 2015-01-07 |
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