CN113141769A - Chip mounter aligning gear - Google Patents
Chip mounter aligning gear Download PDFInfo
- Publication number
- CN113141769A CN113141769A CN202110200420.4A CN202110200420A CN113141769A CN 113141769 A CN113141769 A CN 113141769A CN 202110200420 A CN202110200420 A CN 202110200420A CN 113141769 A CN113141769 A CN 113141769A
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- China
- Prior art keywords
- plate
- fixedly connected
- correction
- rod
- mounter
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K13/00—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
- H05K13/04—Mounting of components, e.g. of leadless components
- H05K13/0404—Pick-and-place heads or apparatus, e.g. with jaws
- H05K13/0413—Pick-and-place heads or apparatus, e.g. with jaws with orientation of the component while holding it; Drive mechanisms for gripping tools, e.g. lifting, lowering or turning of gripping tools
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K13/00—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
- H05K13/04—Mounting of components, e.g. of leadless components
- H05K13/046—Surface mounting
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Supply And Installment Of Electrical Components (AREA)
Abstract
The invention discloses a correcting mechanism of a chip mounter, which comprises a base plate, wherein a mounting head is fixedly mounted at the lower end of a mounting plate, a fixing plate is arranged at the upper end of the base plate in a sliding manner, a chip mounting plate is arranged at the upper end of the fixing plate, one end of a piston rod of a second electric push rod penetrates through the upper end of an L-shaped supporting plate and is fixedly connected with a connector, the lower end of the L-shaped supporting plate is fixedly connected with a convex block, the lower end of the convex block is rotatably provided with a connecting rod, the lower end of the connecting rod is rotatably provided with a clamping plate, one side of the clamping plate is inserted with a correcting plate, and one side of the correcting plate is provided with a correcting groove. When the correction plate is used, the two groups of clamping plates are arranged, the correction plate is arranged on one side of each clamping plate and used for correcting the patches, the problems of low mounting precision and poor mounting performance are solved, the correction plate is convenient to disassemble, different correction plates can be replaced aiming at patches with different sizes, and the correction plate is very convenient to use.
Description
Technical Field
The invention belongs to the technical field of chip mounter equipment, and particularly relates to a correction mechanism of a chip mounter.
Background
Chip mounter: the surface mounting system is a device which is configured behind a dispensing machine or a screen printing machine in a production line and accurately places surface mounting components on PCB pads by moving a mounting head, and the device is divided into a manual device and a full-automatic device.
The full-automatic chip mounter is used for realizing full-automatic component mounting at high speed and high precision, and is the most critical and complex equipment in the whole SMT production. Chip mounters are main devices in SMT production lines, have been developed from early low-speed mechanical chip mounters to high-speed optical centering chip mounters, and have been developed towards multifunctional and flexible connection modularization.
SMT is a surface assembly technique, which is the most popular technique and process in the electronic assembly industry. The surface mounting technology is a new generation of electronic assembly technology, and compresses traditional electronic components into devices with the volume of only one dozen of times, thereby realizing high density, high reliability, miniaturization, low cost and production automation of electronic product assembly.
When the chip mounter is used, a mounting head is generally used for mounting a chip on a PCB (printed circuit board) for finishing mounting work, but in the mounting process of the existing chip mounter, the chip often cannot be accurately positioned at the central position of the mounting head, so that the chip cannot be sucked on the mounting head in a preset posture, if the mounting is carried out at the moment, the problems of low mounting precision and poor mounting performance can be caused, the qualification rate of products is reduced, and a chip correcting mechanism can be arranged on the existing chip mounter, but the chips of different specifications and sizes cannot be corrected, and the chip mounter is very inconvenient to use.
Disclosure of Invention
The invention aims to provide a correcting mechanism of a chip mounter, which is provided with two groups of clamping plates, wherein a correcting plate is arranged on one side of each clamping plate and used for correcting a chip, so that the problems of low mounting precision and poor mounting performance are solved, the correcting plate is convenient to disassemble, different correcting plates can be replaced aiming at the chips with different sizes, and the correcting mechanism is very convenient to use and solves the problems in the background technology.
In order to achieve the purpose, the invention adopts the following technical scheme: a correction mechanism of a chip mounter comprises a base plate, wherein two groups of supporting plates are fixedly connected to the upper end of the base plate, transverse plates are fixedly connected to the upper ends of the two groups of supporting plates, a first electric push rod is fixedly mounted at the upper end of each transverse plate, one end of a piston rod of the first electric push rod penetrates through the transverse plates and extends to the lower end of the transverse plates, one end of the piston rod of the first electric push rod is fixedly connected with a mounting plate, and a mounting head is fixedly mounted at the lower end of the mounting plate;
the upper end of the base plate is slidably provided with a fixed plate, the upper end of the fixed plate is fixedly connected with a telescopic rod, the upper end of the telescopic rod is fixedly connected with a patch plate, the outer part of the telescopic rod is sleeved with a first spring, the upper end of the fixed plate is fixedly connected with an L-shaped supporting plate, the upper end of the L-shaped supporting plate is fixedly provided with a second electric push rod, one end of a piston rod of the second electric push rod penetrates through the upper end of the L-shaped supporting plate and is fixedly connected with a connector, the lower end of the L-shaped supporting plate is fixedly connected with a lug, the lower end of the lug is rotatably provided with a connecting rod, the lower end of the connecting rod is rotatably provided with a clamping plate, one side of the connecting rod is rotatably provided with a rotating rod, the other end of the rotating rod is rotatably arranged on one side of the connector, one side of the clamping plate is inserted with a correcting plate, the inner part of the clamping plate is provided with a spring bead assembly, the correcting plate is arranged on one side of the clamping plate through the spring bead assembly, one side of the correction plate is provided with a correction groove.
Preferably, the equal fixedly connected with sliding block in both ends of mounting panel, it is two sets of the spout has all been seted up to one side of backup pad, and is two sets of the sliding block is located the inside of two sets of spouts respectively.
Preferably, two sets of electric sliding tables are symmetrically installed at the upper end of the base plate, and the lower end of the fixing plate is fixedly installed on the sliding seats of the two sets of electric sliding tables.
Preferably, the L-shaped supporting plates are symmetrically provided with two groups, and the lower ends of the two groups of L-shaped supporting plates are respectively and fixedly connected to the edge of the upper end of the fixing plate.
Preferably, every group the lug of L shape backup pad lower extreme all is the symmetry and is provided with two sets ofly, the lower extreme fixed mounting of lug has first rotation head, the upper end of connecting rod is rotated through first rotation head and is connected in the lower extreme of lug.
Preferably, the upper end fixed mounting of splint has the second to rotate the head, the lower extreme of connecting rod rotates through the second and connects in the upper end of splint.
Preferably, a slot is formed in one side of the clamping plate, an inserting rod is fixedly connected to one side of the correcting plate, one end of the inserting rod is inserted into the slot, and three groups of the inserting rod and the slot are arranged at equal intervals.
Preferably, the clamping plate is provided with a groove inside, the grooves are communicated with the slots inside, each slot is communicated with two groups of grooves, and the spring bead assemblies are fixedly arranged inside the grooves.
Preferably, the spring ball assembly comprises a second spring, one end of the second spring is fixedly connected to the side wall of the groove, the other end of the second spring is fixedly connected with an ejector block, and a steel ball is arranged on one side of the ejector block.
Preferably, the outer wall of the inserted bar is symmetrically provided with two groups of arc-shaped grooves for clamping the steel balls, and the steel balls are aligned with the arc-shaped grooves.
The invention has the technical effects and advantages that: compared with the prior art, the correction mechanism of the chip mounter provided by the invention has the following advantages:
1. according to the invention, one end of the piston rod of the second electric push rod penetrates through the upper end of the L-shaped support plate and is fixedly connected with the connector, the lower end of the L-shaped support plate is fixedly connected with the lug, the lower end of the lug is rotatably provided with the connecting rod, the lower end of the connecting rod is rotatably provided with the clamping plate, one side of the connecting rod is rotatably provided with the rotating rod, the other end of the rotating rod is rotatably arranged on one side of the connector, one side of the clamping plate is inserted with the correction plate, one side of the correction plate is provided with the correction groove, the second electric push rod is utilized to drive the connector to move upwards, so that the connector drives the rotating rods to move, and thus two groups of connecting rods are driven to mutually approach, and finally the clamping plate drives the correction plate to correct the patch, so that the problems of low mounting precision and poor mounting performance are avoided, and the product qualification rate is improved;
2. according to the invention, the spring ball assembly is arranged in the clamping plate, and the correction plate is arranged on one side of the clamping plate through the spring ball assembly, so that the correction plate is convenient to disassemble, different correction plates can be replaced aiming at patches with different sizes, and the use is very convenient.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view taken at A of FIG. 1 in accordance with the present invention;
FIG. 3 is a schematic side view of the present invention;
FIG. 4 is a side view, cross-sectional, schematic view of an L-shaped support plate of the present invention;
FIG. 5 is a schematic top cross-sectional view of the splint of the present invention;
fig. 6 is an enlarged view of the invention at B in fig. 5.
In the figure: 1. a substrate; 2. a support plate; 3. a transverse plate; 4. a first electric push rod; 5. mounting a plate; 6. a mounting head; 7. a chute; 8. a slider; 9. an electric sliding table; 10. a fixing plate; 11. a telescopic rod; 12. a first spring; 13. a patch board; 14. an L-shaped support plate; 15. a second electric push rod; 16. a connector; 17. a bump; 18. a first rotating head; 19. a connecting rod; 20. a second rotating head; 21. a splint; 22. rotating the rod; 23. a correction plate; 24. a correction groove; 25. a groove; 26. a spring bead assembly; 27. a slot; 28. inserting a rod; 29. a second spring; 30. a top block; 31. steel balls; 32. an arc-shaped groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a correcting mechanism of a chip mounter, which is shown in figures 1-6 and comprises a base plate 1, wherein two groups of supporting plates 2 are fixedly connected to the upper end of the base plate 1, a transverse plate 3 is fixedly connected to the upper ends of the two groups of supporting plates 2, a first electric push rod 4 is fixedly arranged at the upper end of the transverse plate 3, one end of a piston rod of the first electric push rod 4 penetrates through the transverse plate 3 and extends to the lower end of the transverse plate 3, a mounting plate 5 is fixedly connected to one end of a piston rod of the first electric push rod 4, a mounting head 6 is fixedly arranged at the lower end of the mounting plate 5, sliding blocks 8 are fixedly connected to both ends of the mounting plate 5, sliding grooves 7 are respectively formed in one side of the two groups of supporting plates 2, the two groups of sliding blocks 8 are respectively positioned inside the two groups of sliding grooves 7, the mounting head 6 is driven by the first electric push rod 4 to move up and down for taking materials from a chip, so as to mount the chip on a PCB, through the arrangement of the sliding grooves 7 and the sliding blocks 8, the situation that the position of the mounting head 6 is deviated when the first electric push rod 4 drives the mounting head 6 to move up and down, so that the surface mount cannot be sucked on the mounting head 6 in a preset posture is avoided;
the upper end of the base plate 1 is provided with a fixed plate 10 in a sliding manner, the upper end of the base plate 1 is symmetrically provided with two groups of electric sliding tables 9, the lower end of the fixed plate 10 is fixedly arranged on the sliding seats of the two groups of electric sliding tables 9, and the two groups of electric sliding tables 9 can drive the fixed plate 10 to move;
the upper end of the fixing plate 10 is fixedly connected with an expansion link 11, the upper end of the expansion link 11 is fixedly connected with a patch plate 13, a first spring 12 is sleeved outside the expansion link 11, the expansion link 11 and the first spring 12 can be used for driving the patch plate 13 to move up and down, when the clamping plates 21 are close to each other, the positions of the clamping plates are slightly higher than those of the patch plate 13, then the patch plate 13 can be driven to move upwards under the action of the expansion link 11 and the first spring 12, so that the upper end of the patch plate 13 can be tightly attached to the lower end of the clamping plate 21, and the patches can be well corrected and fixed;
the upper end of the fixed plate 10 is fixedly connected with an L-shaped supporting plate 14, the L-shaped supporting plates 14 are symmetrically provided with two groups, the lower ends of the two groups of L-shaped supporting plates 14 are respectively and fixedly connected at the edge of the upper end of the fixed plate 10, the upper end of the L-shaped supporting plate 14 is fixedly provided with a second electric push rod 15, one end of a piston rod of the second electric push rod 15 penetrates through the upper end of the L-shaped supporting plate 14 and is fixedly connected with a connector 16, the lower end of the L-shaped supporting plate 14 is fixedly connected with a lug 17, the lugs 17 at the lower end of each group of L-shaped supporting plate 14 are symmetrically provided with two groups, the lower end of the lug 17 is rotatably provided with a connecting rod 19, the lower end of the lug 17 is fixedly provided with a first rotating head 18, the upper end of the connecting rod 19 is rotatably connected to the lower end of the lug 17 through the first rotating head 18, the lower end of the connecting rod 19 is rotatably provided with a clamping plate 21, the upper end of the clamping plate 21 is fixedly provided with a second rotating head 20, the lower end of the connecting rod 19 is rotatably connected to the upper end of the clamping plate 21 through the second rotating head 20, one side of the connecting rod 19 is rotatably provided with a rotating rod 22, and the other end of the rotating rod 22 is rotatably arranged on one side of the connecting head 16;
the second electric push rod 15 is utilized to drive the connector 16 to move upwards, so that the connector 16 drives the rotating rod 22 to move, two ends of the rotating rod 22 are respectively and rotatably connected to the connector 16 and the connecting rods 19, and therefore the two groups of connecting rods 19 can be driven to mutually approach, the two groups of connecting rods 19 mutually approach, so that the clamping plate 21 drives the correcting plate 23 to mutually approach, the paster on the paster plate 13 is corrected, the problems of low pasting precision and poor pasting performance are solved, and the product qualification rate is improved;
a correction plate 23 is inserted into one side of the clamping plate 21, a slot 27 is formed in one side of the clamping plate 21, an insertion rod 28 is fixedly connected to one side of the correction plate 23, one end of the insertion rod 28 is inserted into the slot 27, three groups of insertion rods 28 and 27 are arranged in the slot 27 at equal intervals, and the three groups of insertion rods 28 and the slot 27 are arranged, so that the correction plate 23 is more firmly fixed to one side of the clamping plate 21;
a spring ball assembly 26 is arranged in the clamping plate 21, the correcting plate 23 is arranged on one side of the clamping plate 21 through the spring ball assembly 26, a groove 25 is formed in the clamping plate 21, the groove 25 is communicated with the slots 27, two groups of grooves 25 are communicated with each group of slots 27, the spring ball assembly 26 is fixedly arranged in the groove 25, a correcting groove 24 is formed in one side of the correcting plate 23, and the correcting groove 24 is used for correcting the patch;
the inserted rod 28 inside the slot 27 is used for fixing the correction plate 23 on one side of the clamping plate 21 through the spring ball assembly 26, and when the correction plate 23 needs to be replaced, the correction plate 23 can be detached only by pulling the correction plate 23 down forcibly, so that different correction plates 23 can be replaced for patches with different sizes for correcting the patches;
The working principle is as follows: when the invention is used, two groups of supporting plates 2 are fixedly connected with the upper end of a base plate 1, the upper ends of the two groups of supporting plates 2 are fixedly connected with a transverse plate 3, a first electric push rod 4 is fixedly arranged at the upper end of the transverse plate 3, one end of a piston rod of the first electric push rod 4 is fixedly connected with an installation plate 5, an attachment head 6 is fixedly arranged at the lower end of the installation plate 5, the attachment head 6 is driven by the first electric push rod 4 to move up and down for taking materials from a patch, and the patch is attached to a PCB;
two groups are symmetrically arranged through the L-shaped supporting plate 14, the lower ends of the two groups of L-shaped supporting plates 14 are respectively and fixedly connected at the edge of the upper end of the fixing plate 10, one end of a piston rod of the second electric push rod 15 penetrates through the upper end of the L-shaped supporting plate 14 and is fixedly connected with a connecting head 16, the lower end of the L-shaped supporting plate 14 is fixedly connected with a lug 17, the lug 17 at the lower end of each group of L-shaped supporting plate 14 is symmetrically arranged, the lower end of the lug 17 is rotatably provided with a connecting rod 19, the lower end of the connecting rod 19 is rotatably provided with a clamping plate 21, one side of the connecting rod 19 is rotatably provided with a rotating rod 22, the other end of the rotating rod 22 is rotatably arranged at one side of the connecting head 16, one side of the clamping plate 21 is inserted with a correcting plate 23, one side of the correcting plate 23 is provided with a correcting groove 24, the second electric push rod 15 is utilized to drive the connecting head 16 to move the rotating rod 22 upwards, thereby driving the two groups of connecting rods 19 to approach each other, and finally enabling the clamping plate 21 to drive the correcting plate 23 to correct the paster on the paster plate 13, avoiding the problems of low pasting precision and poor pasting performance and improving the qualification rate of products;
the slot 27 has been seted up through one side of splint 21, one side fixedly connected with inserted bar 28 of correcting plate 23, the one end of inserted bar 28 is pegged graft in the inside of slot 27, the inside of splint 21 is provided with spring ball subassembly 26, the inside inserted bar 28 of slot 27 is used for being fixed in one side of splint 21 with correcting plate 23 through spring ball subassembly 26 for correcting plate 23 is convenient for dismantle, can change different correcting plates 23 to the paster of different sizes, and it is very convenient to use.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a chip mounter aligning gear, includes base plate (1), its characterized in that: the upper end of the base plate (1) is fixedly connected with two groups of supporting plates (2), the upper ends of the two groups of supporting plates (2) are fixedly connected with a transverse plate (3), a first electric push rod (4) is fixedly mounted at the upper end of the transverse plate (3), one end of a piston rod of the first electric push rod (4) penetrates through the transverse plate (3) and extends to the lower end of the transverse plate (3), one end of the piston rod of the first electric push rod (4) is fixedly connected with a mounting plate (5), and a mounting head (6) is fixedly mounted at the lower end of the mounting plate (5);
the upper end of the base plate (1) is slidably provided with a fixing plate (10), the upper end of the fixing plate (10) is fixedly connected with a telescopic rod (11), the upper end of the telescopic rod (11) is fixedly connected with a patch plate (13), the outer sleeve of the telescopic rod (11) is provided with a first spring (12), the upper end of the fixing plate (10) is fixedly connected with an L-shaped supporting plate (14), the upper end of the L-shaped supporting plate (14) is fixedly provided with a second electric push rod (15), one end of a piston rod of the second electric push rod (15) penetrates through the upper end of the L-shaped supporting plate (14) and is fixedly connected with a connector (16), the lower end of the L-shaped supporting plate (14) is fixedly connected with a lug (17), the lower end of the lug (17) is rotatably provided with a connecting rod (19), the lower end of the connecting rod (19) is rotatably provided with a clamping plate (21), one side of the connecting rod (19) is rotatably provided with a rotating rod (22), and the other end of dwang (22) rotates and sets up in one side of connector (16), the one side of splint (21) is pegged graft and is had correction board (23), the inside of splint (21) is provided with spring ball subassembly (26), correction board (23) set up in one side of splint (21) through spring ball subassembly (26), correction groove (24) have been seted up to one side of correction board (23).
2. The mounter correction mechanism according to claim 1, wherein: the equal fixedly connected with sliding block (8) in both ends of mounting panel (5) are two sets of spout (7) have all been seted up to one side of backup pad (2), and are two sets of sliding block (8) are located the inside of two sets of spout (7) respectively.
3. The mounter correction mechanism according to claim 1, wherein: the upper end of base plate (1) is the symmetry and installs two sets of electronic slip tables (9), the lower extreme fixed mounting of fixed plate (10) is on the slide of two sets of electronic slip tables (9).
4. The mounter correction mechanism according to claim 1, wherein: the L-shaped supporting plates (14) are symmetrically arranged in two groups, and the lower ends of the two groups of L-shaped supporting plates (14) are respectively and fixedly connected to the edge of the upper end of the fixing plate (10).
5. The mounter correction mechanism according to claim 4, wherein: every group lug (17) of L shape backup pad (14) lower extreme all are the symmetry and are provided with two sets ofly, the lower extreme fixed mounting of lug (17) has first head (18) of rotating, the upper end of connecting rod (19) is rotated through first head (18) of rotating and is connected in the lower extreme of lug (17).
6. The mounter correction mechanism according to claim 1, wherein: the upper end fixed mounting of splint (21) has second to rotate head (20), the lower extreme of connecting rod (19) rotates head (20) through the second and rotates and connect in the upper end of splint (21).
7. The mounter correction mechanism according to claim 1, wherein: slot (27) have been seted up to one side of splint (21), one side fixedly connected with inserted bar (28) of correction board (23), the one end of inserted bar (28) is pegged graft in the inside of slot (27), slot (27) and inserted bar (28) all are the equidistance and are provided with three groups.
8. The mounter correction mechanism according to claim 7, wherein: the spring bead assembly is characterized in that a groove (25) is formed in the clamping plate (21), the groove (25) is communicated with the slots (27), two groups of grooves (25) are communicated with the slots (27), and the spring bead assembly (26) is fixedly arranged in the grooves (25).
9. The mounter correction mechanism according to claim 8, wherein: spring ball subassembly (26) include second spring (29), the one end fixed connection of second spring (29) is on the lateral wall of recess (25), and the other end fixedly connected with kicking block (30) of second spring (29), one side of kicking block (30) is provided with steel ball (31).
10. The mounter correction mechanism according to claim 9, wherein: two groups of arc-shaped grooves (32) used for clamping and connecting steel balls (31) are symmetrically formed in the outer wall of the inserted rod (28), and the steel balls (31) and the arc-shaped grooves (32) are arranged in an aligned mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110200420.4A CN113141769A (en) | 2021-02-22 | 2021-02-22 | Chip mounter aligning gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110200420.4A CN113141769A (en) | 2021-02-22 | 2021-02-22 | Chip mounter aligning gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113141769A true CN113141769A (en) | 2021-07-20 |
Family
ID=76811293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110200420.4A Withdrawn CN113141769A (en) | 2021-02-22 | 2021-02-22 | Chip mounter aligning gear |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113141769A (en) |
-
2021
- 2021-02-22 CN CN202110200420.4A patent/CN113141769A/en not_active Withdrawn
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210720 |
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| WW01 | Invention patent application withdrawn after publication |