CN111515546A - High-speed online marking system suitable for non-standard object - Google Patents
High-speed online marking system suitable for non-standard object Download PDFInfo
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- CN111515546A CN111515546A CN202010205090.3A CN202010205090A CN111515546A CN 111515546 A CN111515546 A CN 111515546A CN 202010205090 A CN202010205090 A CN 202010205090A CN 111515546 A CN111515546 A CN 111515546A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/362—Laser etching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/04—Automatically aligning, aiming or focusing the laser beam, e.g. using the back-scattered light
- B23K26/046—Automatically focusing the laser beam
- B23K26/048—Automatically focusing the laser beam by controlling the distance between laser head and workpiece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
- B23K26/0648—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising lenses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/0869—Devices involving movement of the laser head in at least one axial direction
- B23K26/0876—Devices involving movement of the laser head in at least one axial direction in at least two axial directions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
- B23K26/705—Beam measuring device
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention provides a high-speed online marking system suitable for non-standard objects, which comprises: the device comprises a laser, a beam expander, a liquid zoom lens with a driver, a line laser distance measurement sensor, X-direction and Y-direction scanning galvanometers, a photoelectric switch, an encoder, a flat field focusing lens, a controller, an upper computer and a conveying belt; the laser is used as a marking light source, and the laser is collimated by a beam expander and enters the liquid zoom lens; the liquid zoom lens is fixed at the laser inlet or outlet of the X-direction and Y-direction scanning galvanometers; the flat field focusing lens is fixed at the laser outlet end of the X-direction scanning galvanometer and the Y-direction scanning galvanometer and is matched with the liquid zoom lens to realize the Z-axis adjustment of a laser focusing point; the encoder and the photoelectric switch are fixed relative to the conveyor belt to acquire the speed of the conveyor belt and the information of the wrapping position; the line laser ranging sensor is fixed relative to the conveyor belt to measure the height of the object to be marked; the controller is used for communicating with the upper computer and controlling the laser, the liquid zoom lens and the X-direction and Y-direction scanning galvanometers.
Description
Technical Field
The invention belongs to the field of laser processing, and particularly relates to a high-speed online marking system suitable for a non-standard object.
Background
The three-dimensional laser scanning technology is a technology which is formed in recent years, and the laser focus three-dimensional control technology greatly expands the application range of laser surface modification or marking. The surface of the material with complex shape and various forms can be effectively modified or marked. The current three-dimensional laser control of the Z axis is mainly realized by a Z axis guide rail lifting device or a zoom lens driven by a motor, and is matched with X, Y axis optical scanning to finish three-dimensional processing. The three-dimensional control method is easy to implement and suitable for occasions with large processing range, low requirements on processing speed and general requirements on precision.
In recent years, the express business volume of China has quietly increased to the first world, for example, as shown in the figure, daily average quantity of express enterprises reaches 700 thousands, and Zhongtong and Yuantong exceed 1200 thousands, and the business volume increasing year by year requires that express companies have strong logistics processing capacity and must be realized by means of the power of automatic equipment. The functions mainly realized by the current logistics sorting line are mainly the functions of bar code identification, volume and weight measurement, delivery area distinguishing and the like. Aiming at the problem of delivery information loss caused by surface sheet loss or defect in the delivery process of the current logistics packages, the permanent characteristic identification can be carried out on the surfaces of the packages by adopting laser to solve the problem. Because the current mainstream logistics sorting linear velocity exceeds 2m/s, the change of the package height is within 1000mm, and the existing laser online marking system cannot meet the requirement.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, provides an online flight marking system which can quickly realize the large-range adjustment of the Z axis within the range of 1000mm, and can realize the high-speed online marking of non-standard objects.
According to the present invention, there is provided a high speed online marking system for non-target objects, comprising: the device comprises a laser, a beam expander, a liquid zoom lens with a driver, a line laser distance measurement sensor, X-direction and Y-direction scanning galvanometers, a photoelectric switch, an encoder, a flat field focusing lens, a controller, an upper computer and a conveying belt; the laser is used as a marking light source, and the laser is collimated by a beam expander and enters the liquid zoom lens; the liquid zoom lens is fixed at the laser inlet or outlet of the X-direction and Y-direction scanning galvanometers; the flat field focusing lens is fixed at the laser outlet end of the X-direction scanning galvanometer and the Y-direction scanning galvanometer and is matched with the liquid zoom lens to realize the Z-axis adjustment of a laser focusing point; the encoder and the photoelectric switch are fixed relative to the conveyor belt to acquire the speed of the conveyor belt and the information of the wrapping position; the line laser ranging sensor is fixed relative to the conveyor belt to measure the height of the object to be marked; the controller is used for communicating with the upper computer and controlling the laser, the liquid zoom lens and the X-direction and Y-direction scanning galvanometers.
Preferably, the non-standard object refers to an object with inconsistent external dimensions, i.e., an object without standard dimensions.
Preferably, the controller linearly modulates the output power of the laser in accordance with the height of the line laser ranging sensor measured to the object to be marked. Therefore, objects with different heights can be ensured to obtain better marking effect.
Preferably, the liquid zoom lens is fixed at the laser inlet or outlet of the X-and Y-direction scanning galvanometer through a fixing seat or a threaded interface.
Preferably, the flat field focusing mirror is connected with the laser outlet ends of the X-direction scanning galvanometer and the Y-direction scanning galvanometer through a fixed seat or a threaded interface.
Preferably, the encoder and the opto-electronic switch are fixed to the side of the conveyor belt.
Preferably, the line laser ranging sensor is fixed directly above the conveyor belt.
Preferably, the laser adopts a 1064nm acousto-optic Q-switched laser with the average power of 10W, the modulation frequency is 1-100 KHz adjustable, and the aperture of an output light spot after light emitted by the laser is expanded and collimated is about 5 mm.
Preferably, the flat field focusing lens adopts a flat field focusing lens with the focal length of 1.5 m.
Preferably, the line laser distance measuring sensor adopts a line laser distance measuring instrument with a distance measuring range of 3 m.
Drawings
A more complete understanding of the present invention, and the attendant advantages and features thereof, will be more readily understood by reference to the following detailed description when considered in conjunction with the accompanying drawings wherein:
fig. 1 schematically shows a system block diagram of a high-speed online marking system suitable for non-target objects according to a preferred embodiment of the present invention.
Description of the drawings: 0 is a laser and a beam expander, 02 is a liquid zoom lens and a driver, 03 lines of laser ranging sensors, 04 is an X-direction scanning galvanometer, 05 is a photoelectric switch, 06 is an encoder, 07 is a flat field focusing lens, 08 is a controller, 09 is an upper computer, 10 is a conveyor belt
It is to be noted, however, that the appended drawings illustrate rather than limit the invention. It is noted that the drawings representing structures may not be drawn to scale. Also, in the drawings, the same or similar elements are denoted by the same or similar reference numerals.
Detailed Description
In order that the present disclosure may be more clearly and readily understood, reference will now be made in detail to the present disclosure as illustrated in the accompanying drawings.
Aiming at the problems that the conventional online flight marking system does not have the function of quickly adjusting the range of 1000mm of a Z axis and cannot meet the marking requirement of a logistics sorting line, the invention provides a high-speed online marking system suitable for non-standard objects.
Fig. 1 schematically shows a system block diagram of a high-speed online marking system suitable for non-target objects according to a preferred embodiment of the present invention. In the specific embodiment, the non-standard object refers to an object with inconsistent external dimensions, that is, an object without standard dimensions, that is, an object to be measured without standard dimensions.
As shown in fig. 1, the high-speed on-line marking system for non-target objects according to the preferred embodiment of the present invention comprises: the device comprises a laser, a beam expander 01, a liquid zoom lens 02, a line laser distance measuring sensor 03, an X-direction scanning galvanometer 04, a Y-direction scanning galvanometer 04, a photoelectric switch 05, an encoder 06, a flat field focusing lens 07, a controller 08, an upper computer 09 and a conveyor belt 10.
The laser is used as a marking light source, and laser is collimated by a beam expander and enters the liquid zoom lens 02; the liquid zoom lens 02 is fixed at the laser inlet or outlet of the X-direction and Y-direction scanning galvanometer 04; the flat field focusing mirror 07 is fixed at the laser outlet end of the X-direction scanning galvanometer 04 and the Y-direction scanning galvanometer 04 and is matched with the liquid zoom lens 02 to realize the Z-axis adjustment of a laser focusing point; the encoder 06 and the photoelectric switch 05 are fixed relative to the conveyor belt 10 to acquire conveyor belt speed and package position information; the line laser ranging sensor 03 is fixed with respect to the conveyor belt 10 to measure the height of the object to be marked; the controller 08 is used for communicating with the upper computer 09 and for controlling the laser, the liquid zoom lens 02 and the X-and Y-direction scanning galvanometers 04.
Preferably, the controller 08 linearly modulates the output power of the laser according to the height of the line laser ranging sensor 03 measured to the object to be marked. Therefore, objects with different heights can be ensured to obtain better marking effect.
For example, the liquid zoom lens 02 is fixed to the laser entrance or exit of the X-and Y-direction scanning galvanometer 04 by a fixing base or a screw interface.
For example, the flat field focusing mirror 07 is connected to the laser output ends of the X-direction scanning galvanometer 04 and the Y-direction scanning galvanometer 04 through a fixed seat or a threaded interface. For example, in some specific cases, the liquid zoom lens 02 is fixed to the laser output ends of the X and Y direction scanning galvanometers 04 through a fixed seat or a threaded interface, and then connected with the flat field focusing lens 07 through the fixed seat or the threaded interface.
For example, the encoder 06 and the photoelectric switch 05 are fixed to the side of the conveyor belt 10.
For example, the line laser ranging sensor 03 is fixed right above the conveyor belt.
Preferably, a 1064nm acousto-optic Q-switched laser with the average power of 10W is used as a marking light source, the modulation frequency is 1-100 KHz adjustable, and the aperture of an output light spot after beam expansion and collimation is about 5 mm.
Preferably, the liquid zoom lens manufactured by OPTOTUNE is an EL-10-42-OF liquid zoom lens, the response time OF the liquid zoom lens is 12ms, the maximum aperture is 10mm, the light-transmitting wave band is 300 nm-2500 nm, the diopter adjustable range is-2 dpt, and the damage threshold is 2.6J/cm2(@1064nm, the pulse width is 125ns, and the frequency is 50 kHz).
Preferably, the method adopts an intelliSCAN series marking and scanning two-dimensional galvanometer of German SCANLAB company, the scanning angles of an X axis and a Y axis are +/-20 degrees, the step time is about 3ms, the maximum caliber is 10mm, the marking speed can reach 3m/s, and the positioning speed is 14 m/s.
Preferably, an ohm dragon E6HZ-CWZ1X2048PPR encoder is adopted, a guide wheel with the circumference of 100mm is selected, and then the displacement measurement precision is as follows:
100mm/2048＝0.049mm
preferably, the distance is measured by adopting an E3Z-T61A ohm dragon correlation type photoelectric switch to be more than 2 meters.
Preferably, the flat field focusing mirror 07 is a flat field focusing mirror with a focal length of 1.5 m.
Preferably, the line laser distance measuring sensor 03 adopts a line laser distance measuring instrument with a distance measuring range of 3 m.
From the above, the comprehensive response time of the scheme is about 15ms, and for a logistics sorting line of 2m/s, the allowable minimum parcel interval is as follows:
15ms*2m/s＝30mm。
when the diopter of the focusing lens is 2Dpt, the focusing lens is combined with a 1.5m flat field focusing lens, when the distance between the two lenses is set to be 100mm (X-direction vibrating lens and Y-direction vibrating lens are arranged in the middle), the effective focal length of the system is 395mm, and the back intercept is about 314 mm. When the focusing lens diopter is 0Dpt, the system is effectively focused to about 1500 mm. Therefore, the adjustment distance of the Z axis of the system is more than 1000mm, and the system is suitable for marking objects with the height change within 1000 mm.
Compared with the prior art, the invention at least has the following technical effects:
(1) in the invention, the liquid lens and the flat field focusing lens are combined to quickly realize Z-axis adjustment.
(2) In the invention, the height of the object to be marked is obtained by the line laser distance sensor, and the focus of the laser is ensured to be positioned on the upper surface of the marked object.
(3) In the invention, the distance information of the distance sensor can linearly modulate the output power of the laser, thereby ensuring that objects with different heights can obtain better marking effect.
(4) In the invention, the combination of X-axis and Y-axis galvanometers and Z-axis quick adjustment function can realize the quick three-dimensional marking of the non-standard object.
(5) The invention is particularly suitable for high-speed online marking of non-standard objects in logistics sorting lines and fresh melon and fruit complex environments.
It should be noted that the terms "first", "second", "third", and the like in the description are used for distinguishing various components, elements, steps, and the like in the description, and are not used for indicating a logical relationship or a sequential relationship between the various components, elements, steps, and the like, unless otherwise specified.
It is to be understood that while the present invention has been described in conjunction with the preferred embodiments thereof, it is not intended to limit the invention to those embodiments. It will be apparent to those skilled in the art from this disclosure that many changes and modifications can be made, or equivalents modified, in the embodiments of the invention without departing from the scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (10)
1. A high speed on-line marking system adapted for use with non-target objects, comprising: the device comprises a laser, a beam expander, a liquid zoom lens with a driver, a line laser distance measurement sensor, X-direction and Y-direction scanning galvanometers, a photoelectric switch, an encoder, a flat field focusing lens, a controller, an upper computer and a conveying belt; the laser is used as a marking light source, and the laser is collimated by a beam expander and enters the liquid zoom lens; the liquid zoom lens is fixed at the laser inlet or outlet of the X-direction and Y-direction scanning galvanometers; the flat field focusing lens is fixed at the laser outlet end of the X-direction scanning galvanometer and the Y-direction scanning galvanometer and is matched with the liquid zoom lens to realize the Z-axis adjustment of a laser focusing point; the encoder and the photoelectric switch are fixed relative to the conveyor belt to acquire the speed of the conveyor belt and the information of the wrapping position; the line laser ranging sensor is fixed relative to the conveyor belt to measure the height of the object to be marked; the controller is used for communicating with the upper computer and controlling the laser, the liquid zoom lens and the X-direction and Y-direction scanning galvanometers.
2. The high-speed, on-line marking system for non-target objects as recited in claim 1, wherein non-target objects refer to objects without a standard size.
3. A high speed on-line marking system for non-target objects as claimed in claim 1 or claim 2 wherein the controller linearly modulates the output power of the laser in accordance with the height of the line laser ranging sensor measured to the object to be marked.
4. The high-speed on-line marking system for non-target objects as claimed in claim 1 or 2, wherein the liquid zoom lens is fixed at the laser inlet or outlet of the X-and Y-direction scanning galvanometer by a fixing seat or a threaded interface.
5. The high-speed on-line marking system suitable for the non-standard objects as claimed in claim 1 or 2, wherein the flat field focusing mirror is connected with the laser outlet ends of the X-direction and Y-direction scanning galvanometers through a fixed seat or a threaded interface.
6. The high-speed on-line marking system for non-target objects as claimed in claim 1 or 2, wherein the encoder and the photoelectric switch are fixed to the side of the conveyor belt.
7. A high speed on-line marking system for non-target objects as claimed in claim 1 or claim 2 wherein the line laser range sensor is mounted directly above the conveyor belt.
8. The high-speed online marking system suitable for the non-standard object as claimed in claim 1 or 2, wherein the laser is a 1064nm acousto-optic Q-switched laser with an average power of 10W, a modulation frequency is 1-100 KHz adjustable, and an output light spot aperture after light emitted by the laser is expanded and collimated is about 5 mm.
9. The high-speed on-line marking system suitable for the non-standard objects according to claim 1 or 2, characterized in that the flat field focusing lens adopts a flat field focusing lens with a focal length of 1.5 m.
10. The high-speed on-line marking system for non-standard objects as claimed in claim 1 or 2, wherein the line laser distance measuring sensor is a line laser distance measuring instrument with a measuring range of 3 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010205090.3A CN111515546A (en) | 2020-03-20 | 2020-03-20 | High-speed online marking system suitable for non-standard object |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010205090.3A CN111515546A (en) | 2020-03-20 | 2020-03-20 | High-speed online marking system suitable for non-standard object |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06226476A (en) * | 1993-01-29 | 1994-08-16 | Komatsu Ltd | Method and device for laser marking |
| JP2004074210A (en) * | 2002-08-15 | 2004-03-11 | Hitachi Constr Mach Co Ltd | Laser marking device and laser marking method |
| TW201420243A (en) * | 2012-11-30 | 2014-06-01 | Ind Tech Res Inst | A three dimensional processing apparatus |
| CN104959319A (en) * | 2015-06-30 | 2015-10-07 | 浙江大学 | Vulnerable fruit grading performing device and method adaptive to belt speed and fruit weight |
| CN106252857A (en) * | 2016-07-29 | 2016-12-21 | 讯创(天津)电子有限公司 | The laser three-D making apparatus of a kind of novel ultra-narrow coupling slot antenna and manufacture method |
| CN106427054A (en) * | 2016-06-21 | 2017-02-22 | 立华彩印（昆山）有限公司 | Improved multifunctional box pasting machine |
| CN108528055A (en) * | 2018-02-13 | 2018-09-14 | 中国烟草总公司北京市公司物流中心 | A kind of cigarette stamp system and method |
| CN109416725A (en) * | 2016-07-05 | 2019-03-01 | 录象射流技术公司 | With the laser marking system focused automatically by lens |
-
2020
- 2020-03-20 CN CN202010205090.3A patent/CN111515546A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06226476A (en) * | 1993-01-29 | 1994-08-16 | Komatsu Ltd | Method and device for laser marking |
| JP2004074210A (en) * | 2002-08-15 | 2004-03-11 | Hitachi Constr Mach Co Ltd | Laser marking device and laser marking method |
| TW201420243A (en) * | 2012-11-30 | 2014-06-01 | Ind Tech Res Inst | A three dimensional processing apparatus |
| CN104959319A (en) * | 2015-06-30 | 2015-10-07 | 浙江大学 | Vulnerable fruit grading performing device and method adaptive to belt speed and fruit weight |
| CN106427054A (en) * | 2016-06-21 | 2017-02-22 | 立华彩印（昆山）有限公司 | Improved multifunctional box pasting machine |
| CN109416725A (en) * | 2016-07-05 | 2019-03-01 | 录象射流技术公司 | With the laser marking system focused automatically by lens |
| CN106252857A (en) * | 2016-07-29 | 2016-12-21 | 讯创(天津)电子有限公司 | The laser three-D making apparatus of a kind of novel ultra-narrow coupling slot antenna and manufacture method |
| CN108528055A (en) * | 2018-02-13 | 2018-09-14 | 中国烟草总公司北京市公司物流中心 | A kind of cigarette stamp system and method |
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Application publication date: 20200811 |
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