CN102589589B - Optical encoder - Google Patents
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- CN102589589B CN102589589B CN201210063486.4A CN201210063486A CN102589589B CN 102589589 B CN102589589 B CN 102589589B CN 201210063486 A CN201210063486 A CN 201210063486A CN 102589589 B CN102589589 B CN 102589589B
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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 the optical disc of optical texture.
[background technology]
At present, in order to accurately grasp the rotation situation of motor, prior art can install optical encoder additional at motor internal.Optical encoder is made up of the optical disc being carved with specific message, light source and an OPTICAL SENSORS.Generally speaking, optical disc has multiple periodic arrangement perforate that light can be allowed to pass through, when optical disc is rotated, OPTICAL SENSORS can receive the light signal with specific period, now, optical encoder just can judge 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 optics of metals dish formed by electroforming mode, and the perforate in optical disc is normally formed by etching mode.Although the optical disc of metal and glass material has good temperature-resistance characteristic and very long serviceable life, utilize electroforming and etch process form optical disc need higher cost on manufacturing.In addition; compared to the optical disc of metal and glass material; light source (being such as light emitting diode) in optical encoder has shorter serviceable life and poor resistance to extreme temperature, and therefore, the light source kind used usually can limit to the range of application of optical encoder.
Hold above-mentioned, how to reduce the manufacturing cost of optical encoder and extend serviceable life of light source, real is one of current research staff's problem of desiring most ardently solution.
[summary of the invention]
The invention provides a kind of optical encoder, it utilizes the optical texture in optical disc to strengthen output light intensity, and then promotes efficiency of light and reduce light emitting diode power demand, reaches the effect extending light source life.
The invention provides a kind of optical encoder and comprise an optical disc, multiple the first optical texture, an axle, a light source and sensor being distributed in this first surface.Optical disc has a first surface, a second surface, relative with first surface is connected to side surface between first surface and 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 the side of side surface, and wherein light source is in order to provide the light transmitted towards side surface.Sensor configurations is in the side of optical disc, and in order to receive the light from first surface injection, wherein first surface is between second surface and sensor.
In one embodiment of this invention, aforesaid first optical texture arranges along at least one circular path, and the center of circle of each circular path and the center superposition of optical disc.
In one embodiment of this invention, aforesaid optical disc has multiple the second optical texture being configured at side surface, and the second optical texture is a concentration structure, and in order to converge light, and the second optical texture corresponds to the first optical texture configuration.
In one embodiment of this invention, aforesaid optical disc has multiple the 3rd optical texture be positioned on second surface.
In one embodiment of this invention, aforesaid 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, in order to make optical disc with axle be axis of rotation rotate time, sensor measures the periodic intensity degree change caused by the first optical texture.
The present invention separately provides a kind of optical encoder to comprise an optical disc, an axle, a light source, multiple first optical texture, multiple second optical texture and a sensor.Optical disc has a first surface, a second surface and relative with first surface is connected to side surface between first surface and 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 the side of optical disc, to provide the light transmitted towards optical disc.Multiple first optical texture is configured in optical disc, in order to receive the light transmitted towards optical disc, and increases the light extraction efficiency of optical disc.Multiple second optical texture is configured in optical disc, and the light penetrated in order to make optical disc produces periodically change.Sensor is positioned at the side of optical disc, in order to receive the light of optical disc injection.
In one embodiment of this invention, aforesaid first optical texture is a cylinder, a polygonal vertebra or a hemispheroidal part.
In one embodiment of this invention, aforesaid sensor and light source are positioned at the same side of optical disc or relative both sides.
In one embodiment of this invention, aforesaid light source is positioned at the side of side surface, and wherein light source is in order to provide the light transmitted towards side surface.
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 relative to sensor.
In one embodiment of this invention, aforesaid optical disc is macromolecular material.
Based on above-mentioned, optical encoder of the present invention can utilize the optical texture in optical disc to increase deviation and the reflectivity of light, promotes the light importing sensor, promotes light utilization rate by this, and reduce brightness needed for light source bright dipping.That is, by promoting light utilization rate, reducing light source output current, to reduce the damage that temperature causes light source, and promoting the life-span of light source further.
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate institute's accompanying drawings to be described in detail below.
[accompanying drawing explanation]
Figure 1A is the schematic side view of the optical encoder of the first embodiment of the present invention.
Figure 1B is the upper schematic diagram of optical disc in Figure 1A.
The periodic intensity degree change schematic diagram that Fig. 1 C measures by sensor in 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 the upper schematic diagram of optical disc in Fig. 4 A.
The periodic intensity degree change schematic diagram that Fig. 4 C measures by sensor in Fig. 4 A.
Fig. 5 A to Fig. 5 F is that light extraction efficiency strengthens constructive embodiment schematic diagram.
Fig. 6 is that light extraction efficiency strengthens the light extraction efficiency graph of a relation of structure in different injection angle.
Fig. 7 is light extraction efficiency method for measurement schematic 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: the 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): relatively large value
B, 440a (b), 440b (b), 440c (b): relatively small 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 the upper schematic diagram of optical disc in Figure 1A.
Please refer to Figure 1A and Figure 1B, the optical encoder 100 of the present embodiment comprises optical disc 110, axle 120, light source 130 and sensor 140.In the present embodiment, optical disc 110 is such as disc like optical dish.In addition, the material of optical disc 110 is such as polycarbonate (Polycarbonate, or acryl (Polymethyl methacrylate, PMMA) or reach the transparent polymer materials such as a gram synthetic fibre (Polyethylene terephthalate, PET) PC).Specifically, optical disc 110 has the first surface S1 second surface S2 relative with first surface S1, is connected to side surface S3 between first surface S1 and second surface S2 and multiple the first optical texture 112 being distributed in first surface S1.
In addition, optical disc 110 more comprises and is multiplely configured at second optical texture 114 of side surface S3 and multiple the 3rd optical texture 116 be positioned on second surface S2.Second optical texture 114 corresponds to the first optical texture 112 and configures.Further, above-mentioned first optical texture 112, second optical texture 114 and the 3rd optical texture 116 are all change the direction of transfer (comprising the advance stopping light) of light and/or change the intensity of light.For example, the first optical texture 112, second optical texture 114 and the 3rd optical texture 116 in order to deviation, guiding and/or can converge light.In the present embodiment, second optical texture 114 is used to increase light L1 and enters ratio in optical disc 110, first optical texture 112 is used to deviation and enters as the light L1 in optical disc 110, and the 3rd optical texture 116 is used to the ratio increasing the sensed device 140 of light L2.But in the embodiment of the present invention, the collocation of above-mentioned first optical texture 112, second optical texture 114 and the 3rd optical texture 116 is also not used to limit the present invention, according to the exposure of the embodiment of the present invention, technician should do suitable modification, such as: the first optical texture 112 be used to deviation enter as the light L1 in optical disc 110, the second optical texture 114 be used to increase that light L1 enters ratio in optical disc 110, the 3rd optical texture 116 is that light guide structure is used for guiding the light L1 entering optical disc 110 and turns to first surface transmission.
In addition, the shape of the 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 the basic plane protruding or be depressed in optical disc 110.In the present embodiment, the first optical texture 112 is such as prism (prism), and the second optical texture 114 is such as V-type groove (v-cut groove), and the 3rd optical texture 116 is such as lenticule (micro-lens).
Axle 120 is arranged at the center of optical disc 110, and wherein optical disc 110 is with axle 120 for axis of rotation rotates, and in other words, axle 120 is in order to the axis of rotation as optical disc 110.In addition, the first optical texture 112 arranges along at least one circular path, and the center superposition of the center of circle of circular path and optical disc 110.In the present embodiment, the first optical texture 112 is such as adopt single channel (single channel) design.Herein, when optical disc 110 rotates at least one circle with axle 120 for axis of rotation, the light that light source 130 sends can sequentially via multiple first optical texture 112 be arranged on same circular path, sensed device 140 captured, and namely these first optical textures 112 be arranged on same circular path are defined as and belong to same passage.But single pass embodiment is also not used to limit the present invention, and in other embodiments, optical encoder also can adopt hyperchannel (multi-channel) design.
In the present embodiment, light source 130 is such as light emitting diode.In addition, light source 130 is such as the side being positioned at side surface S3.In the type of optical encoder, the configuration that this kind of light source 130 is positioned at optical disc 110 side is called that side enters type optical encoder.Specifically, light source 130 is in order to provide a light L1 transmitted towards side surface S3.In addition, sensor 140 is configured at the side (such as top) of optical disc 110, to receive the light L2 penetrated from first surface S1, wherein first surface S1 is between second surface S2 and sensor 140, wherein light L1 enters optical disc 110 by side surface S3, and penetrates optical disc 110 by the side of the closer sensor 140 of optical disc 110.
More specifically, in order to judge that optical disc 110 rotates the demand of the number of turns, the 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 is less than or equal to 100%, and its penetrability is lower than transmission region 112 (A2).Please refer to Fig. 1 C, by this, when optical disc 110 rotates for axis of rotation with axle 120, sensor 140 can measure on the first optical texture 112 and be changed by lightproof area 112 (A1) and the periodic intensity degree caused by transmission region 112 (A2).And by the change of this periodic intensity degree, the rotating speed of optical disc 110 and amount of spin etc. can be calculated further, wherein a is periodic intensity variation relatively large value, and b is periodic intensity variation relatively small value.
In addition, the shape that light intensity peak value (being such as relatively large value a and relatively small value b in Fig. 1 C) and optical texture design is relevant, by the shape of modulation optical texture, can record different intensity variation.Specifically, by the shape of modulation optical texture, can light intensity received by optimization sensor 140.And when light intensity is enough high, that is when in light transmittance process, the losing quantity of light reduces, then by 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, or reach the object reducing sensor 140 consumed powers.
Except above-mentioned side enters type single channel optical encoder, optical encoder of the present invention also can be reflection-type single channel optical encoder, and collocation Fig. 2 is described by its optical design.
Fig. 2 is the schematic side view of the optical encoder of another embodiment of the present invention.Please refer to Fig. 2, the optical encoder 200 of the present embodiment comprises optical disc 210, axle (have analog structure and function with Figure 1B, please refer to Figure 1B), light source 230, multiple first optical texture 212, multiple second optical texture 214 and sensor 240.In the present embodiment, the material of optical disc 210 is such as the transparent polymer materials such as polycarbonate, acryl or PET.Specifically, the optical disc 210 side surface S3 ' that there is first surface S1 ', the second surface S2 ' relative with first surface S1 ' and be connected between first surface S1 ' and second surface S2 '.
In the present embodiment, multiple first optical texture 212 is configured at the first surface S1 ' in optical disc 210, in order to receive the light L1 ' transmitted towards optical disc 210, and increases the light extraction efficiency of optical disc 210.Specifically, the first optical texture 212 is such as hemisphere.But in other embodiments, the first optical texture 212 also can be cylinder.In addition, the hemisphere of indication means that its geometry is the some of spheroid herein, and subject application does not limit the half (50%) that aforesaid hemispheroidal volume is necessary for spheroid volume.
In the present embodiment, multiple second optical texture 214 is configured in optical disc 210, and is positioned at the side of the first optical texture 212.In addition, the shape of the 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 protruding or be depressed in optical disc 210.Specifically, the light of the second optical texture 214 mainly in order to make optical disc 210 penetrate produces periodically change (its effect is such as shown in Fig. 1 C, therefore repeats no more).
In the present embodiment, though the second optical texture 214 and the first optical texture 212 are illustrated in Fig. 2 with difformity, but in practice, the second optical texture 214 also can be similar or the same structure with the first optical texture 212.
In the present embodiment, light source 230 is arranged at the side (such as top) of optical disc 210, and in order to provide a light L1 ' transmitted towards optical disc 210, wherein first surface S1 ' is positioned between second surface S2 ' and 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, and this reflecting element 250 is such as formed by materials such as polyethylene terephthalate (Polyethylene terephthalate, PET), polymeric membrane or metals.Specifically, the reflectivity of reflecting element 250 is such as be greater than 85%.In addition, reflecting element 250 is arranged on the second surface S2 ' of optical disc 210, such as, be combined with macromolecule emplastic or other breasting mechanisms, but the present invention is not as limit.In the type of optical encoder, there is reflecting element 250 and light source 230 is configured at the characteristic persons such as the homonymy of optical disc 210, be called reflective optical encoder.
In addition, the light L1 ' sent when light source 230 is passed to first surface S1 ', and the first optical texture 212 on first surface S1 ' by light L1 ' brought into optical dish 210, and makes light L1 ' transmit towards second surface S2 '.Now, the reflecting element 250 being positioned at second surface S2 ' is suitable for light L1 ' to reflect, and light L1 ' is transmitted towards first surface S1 '.Then, light L2 ' can be derived optical disc 210 by the second optical texture 214 effectively that be positioned on first surface S1 ', to increase the ratio that the sensed device 240 of light L2 ' captures.In addition, the second optical texture 214 be positioned on first surface S1 ' can make sensor 240 capture periodically variable light intensity, uses and judges optical disc 210 rotating speed and amount of spin.
In addition, except above-mentioned side enters type and reflection-type single channel optical encoder, optical encoder of the present invention also can be penetrating type single channel optical encoder, and collocation Fig. 3 is described by its optical design.
Fig. 3 is the schematic side view of the optical encoder of further embodiment of this invention.Please refer to Fig. 3, in the present embodiment, optical encoder 300 is similar with the optical encoder 200 in Fig. 2, only the two Main Differences be in: in the optical encoder 300 of the present embodiment, sensor 340 is positioned at the relative both sides of optical disc 310 and light source 330, and the second optical texture 314 is positioned on second surface S2 '.In addition, optical disc 310 need not have reflecting element 250.In the type of optical encoder, this kind of light source 330 and optical disc 310 are positioned at the configuration of relative both sides, are called penetrating type optical encoder.
In detail, the light L1 ' sent when light source 330 is passed to first surface S1 ', and the first optical texture 312 on first surface S1 ' by light L1 ' brought into optical dish 310, and makes light L1 ' transmit towards second surface S2 '.Now, light L2 ' can be derived optical disc 310 by the second optical texture 314 effectively that be positioned at second surface S2 ', to increase the ratio that the sensed device 340 of light L2 ' captures.In addition, the second optical texture 314 be positioned on second surface S2 ' can make sensor 340 capture periodically variable light intensity, uses and judges optical disc 210 rotating speed and amount of spin.
Except above-mentioned side enters type, reflection-type and penetrating type single channel optical encoder, the optical encoder of subject application also can be the Multi-channel optical scrambler that side enters type, reflection-type and penetrating type, and collocation Fig. 4 A, Fig. 4 B and Fig. 4 C are described by its detailed content.
Fig. 4 A is the schematic side view of the optical encoder of yet another embodiment of the invention.Please refer to Fig. 4 A, the optical encoder 400 of the present embodiment is similar with the optical encoder 100 in Figure 1A, only the two Main Differences be in: the quantity of sensor 440 is multiple, and the first optical texture 412 divides into 3 crowds of 412a, 412b, 412c, and these 3 crowds first optical textures 412a, 412b, 412c are respectively along 3 circular paths arrangement (3 channels designs).In addition, the 3rd optical texture 416 also corresponds to aforementioned 3 crowds first optical textures 412a, 412b, 412c distribution, and divides into 3 crowds of 416a, 416b, 416c.In addition, subject application does not limit group's number of the first optical texture 412, group's number of the 3rd optical texture 416 and the quantity of sensor 440, this field has knows that the knowledgeable shows according to the Teaching-with of the embodiment disclosed by the present invention usually, viewable design demand and change group's number of the first optical texture 412, group's number of the 3rd optical texture 416 and the quantity of sensor 440.
Compared to single channel optical encoder (Fig. 1 ~ Fig. 3), the Multi-channel optical scrambler 400 of the present embodiment accurately can determine absolute position.When adopted port number is more, optical disc 410 just can judge absolute position more accurately.
Please refer to Fig. 4 B and Fig. 4 C, first optical texture 412a of distinct group, the lightproof area 412a (A1) of 412b and 412c, 412b (A1) and 412c (A1) and transmission region 412a (A2), 412b (A2) and 412c (A2) can have three kinds of periodic arrangement modes, to make light L2a, L2b, L2c presents the intensity variation (as shown in Figure 4 C) of 3 kinds of different cycles respectively, wherein 440a (a), 440b (a), 440c (a) is periodic intensity variation relatively large value, 440a (b), 440b (b), 440c (b) is periodic intensity variation relatively small value.
Fig. 5 A to Fig. 5 F is that light extraction efficiency strengthens constructive embodiment schematic diagram.Please refer to Fig. 5 A to Fig. 5 F, various optical textures in Fig. 5 A to Fig. 5 F, can in order to the emergent light receiving light source 130, light source 230, light source 330 provide with light source 430 etc., and make emergent light after by above-mentioned optical texture, irradiant light extraction efficiency and then can be improved.
Improving irradiant light extraction efficiency for clearly demonstrating the above-mentioned optical texture that utilizes, below collocation Fig. 6 and Fig. 7 being illustrated.Fig. 6 is that light extraction efficiency strengthens the light extraction efficiency graph of a relation of structure in different injection angle, and Fig. 7 is light extraction efficiency method for measurement schematic diagram.With reference to Fig. 7, when incident light L1 is that 0 degree (that is vertical incidence) is injected after light extraction efficiency strengthens structure 710 by incident angle α, after strengthening structure 710 and optical disc 720 by light extraction efficiency, each angle of emergence β strengthening the opposite side of structure 710 in optical disc 720 relative to light extraction efficiency measures the intensity of injection light L2, and wherein light extraction efficiency is defined as:
Light extraction efficiency=injection light L2 intensity/incident light L1 intensity.
Please refer to Fig. 6, wherein 610 is the light extraction efficiency curve that Fig. 5 A optical efficiency strengthens structure, and 620 is the light extraction efficiency curve that Fig. 5 C optical efficiency strengthens structure, arranging sensor in suitable angle if can find, its light extraction efficiency can reach more than 70 of percentage.
The above-mentioned optical disc with multi-passage design enters in type optical encoder except being applied in side, also can be applicable in reflective optical encoder and penetrating type optical encoder.
In sum, subject application forms optical disc with transparent polymer material, can reduce the processing procedure cost of optical disc, and comparatively electroforming and etch process are easily reached technically.In addition, the light that light emitting diode exports more effectively can be directed to sensor by the optical texture in optical disc, because the light utilization efficiency of light source is promoted, therefore light source has an opportunity to work under lower operating temperature again, and its serviceable life can be even further improved by applying coatings.In addition, embodiment of the present invention exposure side enters type optical encoder, because light source is arranged at the side of optical disc, therefore, it is possible to reduce the thickness of scrambler.
Although the present invention discloses as above with embodiment; so itself and be not used to limit the present invention; have in any art and usually know the knowledgeable; without departing from the spirit and scope of the present invention; when doing a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on the accompanying claim person of defining.
Claims (11)
1. an optical encoder, comprising:
One optical disc, has a first surface, a second surface, relative with this first surface is connected to side surface between this first surface and this second surface;
Multiple the first optical texture being distributed in this first surface, in order to receive the light transmitted towards this optical disc, and increases the light extraction efficiency of this optical disc;
One axle, is arranged at the center of this optical disc, in order to the axis of rotation as this optical disc;
One light source, is positioned at the side of this side surface, and wherein this light source is in order to provide the light transmitted towards this side surface; And
One sensor, is configured at the side of this optical disc, and in order to receive the light penetrated 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 arrange along at least one circular path, and the respectively center of circle of this circular path and the center superposition of this optical disc.
3. optical encoder according to claim 1, it is characterized in that, this optical disc has multiple the second optical texture being configured at this side surface, and this second optical texture is a concentration structure, in order to converge light, and those second optical textures correspond to the configuration of those first optical textures.
4. optical encoder according to claim 3, is characterized in that, this optical disc has multiple the 3rd optical texture be 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 side surface this optical disc incident, makes the turn light rays first surface transmission from this side surface this optical disc 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, in order to make this optical disc with this axle for axis of rotation rotate time, this sensor measure this caused by the first optical texture periodic intensity degree change.
7. an optical encoder, comprising:
One optical disc, has a first surface, a second surface and relative with this first surface is connected to side surface between this first surface and this second surface;
One axle, is arranged at the center of this optical disc, in order to the axis of rotation as this optical disc;
One light source, is arranged at the side of this optical disc, to provide the light transmitted towards this optical disc;
Multiple first optical texture, is configured on this first surface of this optical disc, in order to receive the light that this transmits towards this optical disc, and increases the light extraction efficiency of this optical disc;
Multiple second optical texture, is configured in this optical disc, and the light penetrated in order to make this optical disc produces periodically change; And
One sensor, is positioned at the side of this optical disc, in order to receive the light of this optical disc injection.
8. optical encoder according to claim 7, is characterized in that, this first optical texture is a cylinder, a polygonal vertebra or a hemispheroidal part.
9. optical encoder according to claim 7, is characterized in that, this sensor and this light source are positioned at the same side of this optical disc or relative both sides.
10. optical encoder according to claim 7, is characterized in that, and this light source is positioned at the side of this side surface, and wherein this light source is in order to provide the light transmitted towards this side surface.
11. optical encoders according to claim 7, is characterized in that, more comprise a reflecting element, and wherein this reflecting element is arranged at the opposite side of this optical disc relative 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 CN102589589A (en) | 2012-07-18 |
| CN102589589B true CN102589589B (en) | 2015-01-07 |
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| CN201210063486.4A Active CN102589589B (en) | 2011-12-19 | 2012-03-12 | Optical encoder |
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| CN112325912A (en) * | 2020-11-20 | 2021-02-05 | 广东瑞讯电子科技有限公司 | Optical encoder assembly |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN1740752A (en) * | 2004-08-25 | 2006-03-01 | 安捷伦科技有限公司 | Optical encoding that utilizes total internal reflection |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004340929A (en) * | 2003-04-21 | 2004-12-02 | Mitsubishi Electric Corp | Optical rotary encoder |
| JP5111031B2 (en) * | 2007-09-14 | 2012-12-26 | キヤノン株式会社 | Displacement detection method and motor control device |
| EP2213987A1 (en) * | 2009-02-03 | 2010-08-04 | Leica Geosystems AG | Opto-electronic position measurement apparatus and opto-electronic position measurement method |
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- 2011-12-19 TW TW100147191A patent/TWI451067B/en active
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2012
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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 |
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Also Published As
| Publication number | Publication date |
|---|---|
| TWI451067B (en) | 2014-09-01 |
| TW201326761A (en) | 2013-07-01 |
| CN102589589A (en) | 2012-07-18 |
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