CN215893645U - An encoder based on transmission and reflection scheme - Google Patents
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Abstract
The utility model provides an encoder based on a transmission and reflection scheme, which comprises: the device comprises a scale grating, an indication grating, a photoelectric receiver, a light source and a reflection switch group; the scale grating is provided with a vernier code channel group for single-circle counting and a Gray code channel group for multi-circle counting, the vernier code channel group is positioned in a transmission region of the scale grating, the Gray code channel group is positioned in the transmission region and a reflection region of the scale grating, and the Gray code channel group comprises at least two Gray code channels; the reflection area is positioned at the installation position of the scale grating and the rotating shaft, the position is not applied in the existing encoder, and the total number of code tracks is increased by applying the position, so that the encoder can be miniaturized; the utility model increases the calibration allowance of the encoder by increasing the number of Gray code channels, thereby improving the fault-tolerant capability of the encoder; the present invention applies a reflective switch to the multi-turn count of the encoder, avoiding the limitation of the tube voltage drop of the light source to the multi-turn count.
Description
Technical Field
The utility model relates to the field of encoders, in particular to an encoder based on a transmission and reflection scheme.
Background
The photoelectric encoder is a digital checking device integrating light, machine and electricity into one body, it is a sensor which can convert the mechanical and geometric displacement quantity transferred to the shaft into pulse or digital quantity by means of photoelectric conversion circuit, and is mainly used for detecting speed or position. The method has the advantages of high precision, quick response, stable and reliable performance and the like.
The existing photoelectric encoder has no combined transmission and reflection scheme.
SUMMERY OF THE UTILITY MODEL
The present invention provides an encoder based on the transmission and reflection scheme to solve the above problems.
In order to achieve the purpose, the utility model adopts the following specific technical scheme:
an encoder based on a transmissive and reflective scheme, comprising: the device comprises a scale grating, an indication grating, a photoelectric receiver, a light source and a reflection switch group; the scale grating is provided with a vernier code channel group for single-circle counting and a Gray code channel group for multi-circle counting;
the vernier code channel group comprises an M code channel, an N code channel and an S code channel, wherein a plurality of light-transmitting areas which are regularly distributed along the code channel are engraved on the M code channel, the N code channel and the S code channel, the Gray code channel group comprises at least two Gray code channels, and the Gray code channels are light and dark alternate stripes which are regularly distributed; the indication grating is provided with at least five code channels corresponding to the cursor code channel group and the Gray code channel group, and each code channel of the indication grating is engraved with a plurality of light-transmitting areas regularly distributed along the code channel;
the vernier code channel group is positioned in a transmission region of the scale grating, and the Gray code channel group is positioned in the transmission region and a reflection region of the scale grating;
the reflection region is located at the installation position of the scale grating and the rotating shaft.
Preferably, the N code channel, the M code channel and the S code channel are sequentially arranged from outside to inside, and at least two gray code channels are respectively disposed between the M code channel and the N code channel, between the M code channel and the S code channel, outside of the N code channel or inside of the S code channel.
Preferably, the optical system is arranged between the light source and the scale grating.
Preferably, the scale grating is mounted on the shaft by means of a light-absorbing adhesive.
Preferably, the mounting position of the rotating shaft is subjected to oxidation blackening treatment.
Preferably, the light absorption plate is further included and is located at the installation position of the rotating shaft.
The utility model can obtain the following technical effects:
(1) the reflection area is positioned at the installation position of the scale grating and the rotating shaft, the position is not applied in the existing photoelectric encoder, and the existing photoelectric encoder has no transmission and reflection combined scheme, and the total number of code tracks is increased by applying the position, so that the encoder can be miniaturized;
(2) the calibration margin of the encoder is improved by increasing the number of Gray code channels, so that the fault-tolerant capability of the encoder is improved, and the encoder can work normally under different working conditions;
(3) the pressure drop of the transmission light source tube is large, multi-turn counting cannot be carried out, the reflection switch is applied to multi-turn counting of the encoder, and the limitation of the tube pressure drop of the transmission light source on the multi-turn counting is avoided;
(4) and a magnetic coding mode is not used for multi-turn counting, so that the anti-interference, electrostatic and magnetoelectric capabilities of the encoder are improved.
Drawings
FIG. 1 is a schematic structural diagram of an encoder based on a transmissive and reflective scheme according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a structure of a scale grating according to an embodiment of the utility model;
FIG. 3 is a schematic diagram of a structure of an optoelectronic receiver according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a reflective switch according to an embodiment of the present invention.
Wherein the reference numerals include: a scale grating 1, an indication grating 2, a photoelectric receiver 3, a light source 4, a rotating shaft 6, an M code channel 1-1, an N code channel 1-2, an S code channel 1-3, a first Gray code channel 1-4, a second Gray code channel 1-5, a third Gray code channel 1-6 and a fourth Gray code channel 1-7, the device comprises a transmission area 1-8, a reflection area 1-9, an M code channel optical signal receiving window 3-1, an N code channel optical signal receiving window 3-2, an S code channel optical signal receiving window 3-3, a first Gray code channel optical signal receiving window 3-4, a second Gray code channel optical signal receiving window 3-5, a first reflection switch 5-1, a second reflection switch 5-2, a first reflection switch light source 5-1-1 and a first reflection switch photoelectric conversion chip 5-1-2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not to be construed as limiting the utility model.
As shown in fig. 1, an encoder based on the transmission and reflection scheme provided by the embodiment of the present invention includes: the device comprises a scale grating 1, an indication grating 2, a photoelectric receiver 3, a light source 4 and a reflection switch group; the scale grating 1 is provided with a vernier code channel group for single-circle counting and a Gray code channel group for multi-circle counting;
the light emitted by the light source 4 sequentially penetrates through the light-transmitting area of the scale grating 1 and the light-transmitting area of the indication grating 2 to be received by the photoelectric receiver 3, and is converted into an electric signal to be output after being processed by amplification, shaping, filtering and the like;
as shown in fig. 3, the lower surface of the optical receiver 3 is provided with a plurality of optical signal receiving windows, which respectively correspond to the cursor code channel group and the gray code channel group, and include an M code channel optical signal receiving window 3-1, an N code channel optical signal receiving window 3-2, an S code channel optical signal receiving window 3-3, a first gray code channel optical signal receiving window 3-4, and a second gray code channel optical signal receiving window 3-5.
As shown in fig. 1, the reflective switch group of this embodiment includes a first reflective switch 5-1 and a second reflective switch 5-2, light emitted by the first reflective switch 5-1 and the second reflective switch 5-2 is reflected by the reflective area of the scale grating 1, returns to the first reflective switch 5-1 and the second reflective switch 5-2, is received by the first reflective switch 5-1 and the second reflective switch 5-2, and is converted into an electrical signal to be output, and a rotation angle of a rotating shaft 6 on which an encoder is mounted is obtained according to the electrical signal output by the photoelectric receiver 3 and the reflective switch group; the tube voltage drop of the light source 4 is large, multi-turn counting cannot be carried out, the reflection switch is applied to the multi-turn counting of the encoder, and the limitation of the tube voltage drop of the light source 4 to the multi-turn counting is avoided.
The reflective switch group includes reflective switches having the same structure and including reflective switch light sources and photoelectric conversion chips, as shown in fig. 4, taking the first reflective switch 5-1 as an example, the first reflective switch 5-1 includes the first reflective switch light source 5-1-1 and the first reflective switch photoelectric conversion chip 5-1-2.
When the scale grating 1 rotates, the shielding condition of the light source 4 is changed by the vernier track group and the gray track group, and an incident optical signal is cut into a signal with variable intensity, so that the intensity of light received by the photoelectric receiver 3 is changed, and further, an electrical signal output by the photoelectric receiver 3 is changed.
As shown in fig. 2, the cursor track group includes an M track 1-1, an N track 1-2, and an S track 1-3, where the M track 1-1, the N track 1-2, and the S track 1-3 are all engraved with a plurality of light-transmitting regions regularly distributed along the track, so that the M track 1-1, the N track 1-2, and the S track 1-3 are light-dark stripes, where the light-transmitting regions are light stripes and the light-opaque regions are dark stripes; the gray code channel group comprises light and dark alternate stripes which are regularly distributed on at least two gray code channels, in the embodiment, the gray code channel group comprises four gray code channels, namely a first gray code channel 1-4, a second gray code channel 1-5, a third gray code channel 1-6 and a fourth gray code channel 1-7, the first gray code channel 1-4 and the second gray code channel 1-5 are positioned in a transmission area 1-8, and the third gray code channel 1-6 and the fourth gray code channel 1-7 are positioned in a reflection area 1-9; the indication grating 2 is provided with at least five code channels corresponding to the vernier code channel group and the Gray code channel group, each code channel of the indication grating 2 is engraved with a plurality of light transmission areas regularly distributed along the code channel, so that each code channel of the indication grating 2 is also light and dark stripes, wherein the light transmission areas are bright stripes, and the light transmission positions are dark stripes;
the vernier code channel group is positioned in a transmission region 1-8 of the scale grating 1, the Gray code channel group is positioned in the transmission region 1-8 and a reflection region 1-9 of the scale grating 1, and the number of reflection switches contained in the reflection switch group is the same as that of the Gray code channels positioned in the reflection region 1-9; the surface light reflectivity of the code channels of the reflection areas 1-9 is more than or equal to 50 percent, and in order to avoid the influence of stray light on the signal quality, the light transmissivity of the reflection areas 1-9 of the scale grating 1 is more than or equal to 90 percent; the reflective areas 1-9 are located at the mounting positions of the scale grating 1 and the shaft 6, which are not used in existing encoders, by which the total number of code tracks is increased.
When vernier operation is carried out according to the M code channel 1-1, the N code channel 1-2 and the S code channel 1-3 to jointly obtain the output of the encoder, the encoder is an absolute encoder, and when the output of the encoder is obtained according to any one of the M code channel 1-1, the N code channel 1-2 and the S code channel 1-3, the encoder is an incremental encoder.
In one embodiment of the utility model, N code channels 1-2, M code channels 1-1 and S code channels 1-3 are sequentially arranged from outside to inside, at least two Gray code channels are arranged between the M code channels 1-1 and the N code channels 1-2, between the M code channels 1-1 and the S code channels 1-3, outside of the N code channels 1-2 or inside of the S code channels 1-3; the position of the Gray code channel has no influence on the effect of the Gray code, and can be set according to the actual condition of the scale grating 1.
In one embodiment of the present invention, an optical system for converting light emitted from the light source 4 into parallel light is further included, the optical system being disposed between the light source 4 and the scale grating 1; the light is uniformized by converting the light into parallel light, so that the light intensity of the light irradiated to the scale grating 1 is uniform.
In one embodiment of the utility model, the scale grating 1 is mounted on the shaft 6 by means of an optically absorptive adhesive to improve the contrast between the reflective and non-reflective areas of the reflective areas 1-9.
In one embodiment of the present invention, the mounting position of the rotating shaft 6 is subjected to oxidation blackening treatment to prevent the photoelectric conversion chip from being affected by the environment and stray light reflected by the scale grating 1.
In an embodiment of the present invention, the optical axis-rotating ruler further comprises an optical absorption plate, the optical absorption plate is located at the installation position of the rotating axis 6, and the optical absorption plate is arranged between the rotating axis 6 and the scale grating 1 to absorb stray light, so as to further improve the contrast between the reflective area and the non-reflective area of the reflective areas 1-9.
The advantages of the utility model are explained in detail below:
obtaining a calibration value of the encoder through vernier calculation according to phase deviations of the S code channel 1-3 and the N code channel 1-2 relative to the M code channel 1-1, wherein the larger the phase deviation of the S code channel 1-3 and the N code channel 1-2 relative to the position of the M code channel 1-1 is, the larger the calibration value is; under the unchangeable prerequisite of encoder overall structure, when the temperature variation, expend with heat and contract with cold appears in the material, and the skew appears in the relative position of scale grating 1 and photoelectric receiver 3 promptly, leads to the calibration value increase of encoder, and when the calibration value is greater than or equal to the demarcation tolerance, the encoder warning can not normal operating promptly, therefore the improvement of the demarcation allowance of encoder can improve the temperature adaptability of encoder.
When the encoder counts a single turn, the N code track 1-2 and the S code track 1-3 need to be synchronized with the M code track 1-1, so that synchronization bits need to be provided, and the more the synchronization bits are, the easier the synchronization is, but the encoder precision is reduced as the synchronization bits are increased, and in the present invention, the number of synchronization bits c is 4.
The required physical mark number of the M code channel 1-1 is 2aThat is, the physical bit number output by the encoder is a bits, and the pulse number of the M code channels 1-1 in each electrical cycle is 2n+sThe number of pulses of N code channels 1-2 is 2n+s1, number of pulses of S-code channels 1-3 is 2n+s-2sEquation (1) can be derived from the encoder principle:
a＝n+s+b (1)
wherein N is the number of bits used for N code channels 1-2 in the output electrical signal, S is the number of bits used for S code channels 1-3 in the output electrical signal, and b is the number of Gray code channels contained in the Gray code channel group; since the bits used for N-code channels 1-2 are the encoder high bits, N-s or N-s +1 is usually used to reduce the probability of error in the encoder reading.
The formula for calculating the calibration margin of the encoder is as the formula (2):
K＝±7(360°/2n+c) (2)
wherein K is the calibration allowance of the encoder;
as can be seen from the formulas (1) and (2), under the condition that the scale numbers of the M code channel 1-1, the N code channel 1-2 and the S code channel 1-3 are not changed, the number of the Gray code channels is increased, so that the calibration margin of the encoder can be effectively increased.
The utility model can be applied to the development of a high-resolution and high-precision encoder, and in one embodiment of the utility model, the number of the scribed M-channels 1-1 of the scale grating 1 is 2048P/r, namely, the number of bits a of the electric signal output by the encoder is 11 bits.
N-s-4 is selected, and the pulse number of the M code channel 1-1 is 2 in each electrical period of the scale grating 14+4The number of pulses of N code channels 1-2 is 24+4The pulse numbers of-1 and S-code channels 1-3 are respectively 24+4-24And according to the calculated number b of Gray code channels being 3.
The encoder calibration margin K is calculated to be +/-9.84 degrees, which is 2 times of the calibration margin of the encoder of the current transmission scheme.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be taken as limiting the utility model. Variations, modifications, substitutions and alterations of the above-described embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.
The above embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
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| CN113639771A (en) * | 2021-09-09 | 2021-11-12 | 长春禹衡光学有限公司 | An encoder based on transmission and reflection scheme |
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| CN113639771A (en) * | 2021-09-09 | 2021-11-12 | 长春禹衡光学有限公司 | An encoder based on transmission and reflection scheme |
| CN113639771B (en) * | 2021-09-09 | 2025-02-11 | 长春禹衡光学有限公司 | An encoder based on transmission and reflection scheme |
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