CN1115513A - Miniature motor - Google Patents
Miniature motor Download PDFInfo
- Publication number
- CN1115513A CN1115513A CN95105820.7A CN95105820A CN1115513A CN 1115513 A CN1115513 A CN 1115513A CN 95105820 A CN95105820 A CN 95105820A CN 1115513 A CN1115513 A CN 1115513A
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- Prior art keywords
- brush
- pigtail
- casing cover
- link
- shell
- Prior art date
- 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.)
- Granted
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- 239000004020 conductor Substances 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 7
- 239000007769 metal material Substances 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 4
- 230000014509 gene expression Effects 0.000 description 16
- 230000003321 amplification Effects 0.000 description 7
- 238000003199 nucleic acid amplification method Methods 0.000 description 7
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 238000003825 pressing Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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Abstract
The invention relates to a micro-motor which comprises a shell provided with a permanent magnet firmly fixed inner peripheral, a rotor provided with an armature core and a commentator and a shell cover provided with an electric brush feeding electric power and input terminals; wherein, a link unit made of conducting material is formed at the inner end face of the shell cover; the link unit is directly connected with one of the input terminals or connected with one of the input terminals through other conducting parts; the link unit and the other input terminal are connected with the electric brush through a pigtail line; an arm part of a helical torsion spring contacts the outer end of the electric brush, so the electric brush is pressed to the commentator by force and the pigtail line winds the arm part.
Description
Present invention relates in general to for example be used for the electrical micro-machine of household electrical appliance, precision instrument, power tool and motor vehicle electricity parts, more specifically to a kind of like this electrical micro-machine, wherein constituting the pigtail of power feed parts and the interference between other parts can be prevented, and the power feed brush can stably carry out sliding contact with commutator.
Fig. 1 is the axial local positive view of the electrical micro-machine of general type.In Fig. 1, the shell that reference number 1 expression is made by the such metal material of for example mild steel, shell is hollow barrel-shaped that the end is arranged, and has for example permanent magnet 2 of segmental arc, is installed to securely on the inner peripheral surface of shell.Rotor 5 with armature core 3 and commutator 4 is installed in shell 1.The casing cover that reference number 6 expressions are made by resin material, it is assembled to the opening end of shell 1.
The brush of square-section is for example made in reference number 45 expression, and is assembled to slidably on the brush carriage 15, and it is barrel-shaped that brush carriage 15 is made hollow side, and be formed on the inner face of casing cover 6, makes brush and commutator 4 sliding contacts.
The for example variable resistance of annular is made in reference number 46 expressions, is fixed between armature core 3 and the commutator 4 with concentric manner, and is connected electrically between the two, so that suppress electrical noise.
Utilize said structure, when electric current is delivered to winding on armature core 3 from input terminal 8 by pigtail 14, brush 45 and the commutator 4 that constitutes rotor 5, revolving force is applied on the rotor 5 that is arranged in magnetic field, this magnetic field is to be produced by the permanent magnet on the inner peripheral surface that is fixedly mounted in shell 12, this makes rotor 5 rotations, by the axle 11 driving external equipment (not shown) of outlet side.
As for being connected of the pigtail 14 in the electrical micro-machine of input terminal 8 and said structure, can realize like this that promptly by welding one end of pigtail 14 directly is connected with input terminal 8, its other end links to each other with brush 45.The coupling device terminal of a end that also can be by being fixedly mounted in pigtail 14 connects input terminal 8; Coupling device terminal link to each other with input terminal 8 (for example being the utility model file of No.Hei-3 (1991)-7655) referring to the uncensored publication number of Japan.In addition, can block the mid portion of pigtail 14 with the pigtail support, prevent that when pigtail 14 is linked to each other with input terminal 8 brush 45 breaks away from brush carriage 15 (for example being the utility model file of No.Hei-5 (1993)-7656 referring to the uncensored publication number of Japan).
Utilize conventional structure, if pigtail 14 is oversize, the mid portion of pigtail 14 will relax so, and volume is to armature core 3, and armature core 3 or the variable resistance 46 between armature core 3 and commutator 4 influence each other.This will cause machinery noise, or damage rotor 5 under extreme case.
If pigtail 14 is too short, then will hinder the slip of the brush 45 in the brush carriage 15, cause contact instability between brush 45 and the commutator 4.
Fig. 2 is the auxiliary view that amplifies, around explanation brush carriage 15.The part identical with Fig. 1 represented with identical reference number.In Fig. 2, brush 45 is by helical torsional spring 13 prestrains, then the brush 45 stressed lefts of pressing to, with commutator 4 sliding contacts.If pigtail 14 is too short, the coupling part 14a that links to each other with brush 45 of pigtail 14 will move along the circular arc line C1 among the figure around the coupling part 14b that pigtail 14 links to each other with input terminal 8 so.So just, hinder the slip of the brush 45 in the brush carriage 15, or shortened the useful life of brush 45.
When pigtail 14 was linked to each other with input terminal 8, scolder can flow to pigtail 14, near the part 14c of the formation hardening 14b of coupling part.The coupling part 14a that links to each other with brush 45 of pigtail 14 will move along the less circular arc line C2 of radius as a result, make the problems referred to above become more serious.
In the last few years, require machinery noise and electrical noise in the electrical micro-machine more and more littler, and needed electrical micro-machine to have the electronic Noise Suppression parts now, variable resistance 46 for example shown in Figure 1.In addition, to the growing needs of less motor, rotor 5 and the distance that has between the power feed parts of brush 45 became more and more littler along with in recent years.For this reason, also need to prevent pigtail 14 clots and assurance brush 45 stable slips.Therefore, in extremely little inner space, can not adopt in the above-mentioned Japanese Utility Model disclosed method to connect or block pigtail 14, because of it causes the increase of number of parts.Moreover also can hinder the motor reduced volume.
The present invention is intended to solve problem intrinsic in the above-mentioned prior art.An object of the present invention is to provide a kind of electrical micro-machine, it can solve problem intrinsic in the above-mentioned prior art, prevents to constitute the phase mutual interference between the pigtail of power feed parts, and guarantees the level and smooth slip of power feed brush.
In order to realize these purposes, according to the invention provides a kind of electrical micro-machine, it comprises the shell of being made by for example metal material, shell is hollow barrel-shaped that the end is arranged, and has a permanent magnet that is installed to securely on the inner peripheral surface, have facing to the armature core of permanent magnet and the rotor of commutator, and the casing cover that is assembled to an opening end of shell; On casing cover, provide and support brush and make it with a pair of brush carriage of commutator sliding contact and by pigtail or the pair of input terminals that is electrically connected with brush by pigtail and other conductive component; Rotor is supported by the rotation of the bearing on outer casing bottom and the casing cover, and wherein the link of being made by electric conducting material is formed on the inner face of casing cover; Link directly or by one in other conductive component and the input terminal links to each other; Link links to each other with brush by pigtail with another input terminal; By the arm portion of the helical torsional spring that contacts with the outer end of brush to brush prestrain, so the stressed commutator of pressing to of brush; And pigtail twines arm portion.
Fig. 1 is the axial fragmentary sectional elevation view of the electrical micro-machine of general type.
Fig. 2 is the auxiliary view that amplifies, in order to the situation around the brush carriage in the key diagram 1 15.
Fig. 3 is the inner face view that is used for the casing cover of the first embodiment of the present invention.
Fig. 4 is the basic cross sectional side view that A-the A line is cut open along Fig. 3.
Fig. 5 is the outer face view that is used for the casing cover of the first embodiment of the present invention.
Fig. 6 A and 6 B are plane graph and end view drawings of the amplification of the brush carriage 15 among Fig. 3 to 5.
Fig. 7 A is the plane graph of the amplification of the link 16 among Fig. 3 to 5.
Fig. 7 B and 7C are the views of seeing with the direction of the arrow B of Fig. 7 A and C respectively.
Fig. 8 A and 8B are the plane graph of amplification of the input terminal 8 among Fig. 3 to 5 and the end view of amplification.
Fig. 9 to 11 is inner face views of the casing cover 6 of second to the 4th embodiment of the present invention.
Fig. 3 and 5 is inner face view and outer face views of the casing cover of the first embodiment of the present invention, and Fig. 4 is the basic cross sectional side view that A-the A line is cut open along Fig. 3.The part identical with Fig. 1 represented with identical reference number.In Fig. 3 to 5, brush carriage 15 is made by electric conducting material, and end surface shape is U-shaped substantially, and this is illustrated afterwards, and places mounting portion 6a, and mounting portion 6a is outstanding from the inner face of casing cover 6 slightly, is assemblied in securely on the casing cover 6 by fixture 20.Brush 45 remains in the brush carriage 15, slides among the groove 6b that can provide on the surface of mounting portion 6a.By with the arm portion of the helical torsional spring 13 of the back end in contact of brush 45 to brush 45 prestrains, brush 45 stressed centers of pressing to motor.The resistor of reference number 49 expression positive temperature coefficients, reference number 50 expression capacitors.
The link that reference number 16 expressions are made by electric conducting material, flat shape is U-shaped substantially, this is illustrated afterwards, and is assembled to the inner face of casing cover 6 by fixture 21 with the state with brush carriage 15 insulation securely.The pair of terminal 17 that is used to connect capacitor 50 with 17 and the terminal 18 that is used to be connected pigtail 14 be integrally formed in link 16, and stretch out from the inner face of casing cover 6.
Be provided with on the input terminal 8 a stop portions (not shown), preceding push away and lift parts 24 and before push away and lift parts 52, this is illustrated afterwards.Input terminal 8 is assemblied on the casing cover 6 securely, passes casing cover 6, and the one end stretches into link 41.Input terminal 8 links to each other with an opening end 16a of link 16 by PTC resistor 49 respectively with 8, and directly links to each other with another opening end 16b.
Capacitor 50 60 is connected between the terminal 17 and 17 of link 16 and 16 by going between.
Utilize said structure, power supply can directly or by PTC resistor 49 be fed to link from input terminal 8, is fed to a pair of brush 45 by pigtail 14 then.Capacitor 50 is connected between brush 45 and 45 in parallel.So electrical micro-machine can prevent overheated and produce electrical noise.
Fig. 6 A and 6B are the plane graph and the end view drawings of the amplification of the brush carriage 15 shown in Fig. 3 to 5.In Fig. 6 A and 6B, brush carriage 15 has an otch 15a on the part of end face thereon, allow the pigtail 14 shown in Fig. 3 and 4 movable therein, and the cross section is U-shaped substantially.Brush 15 has the fixture 20 of downward extension.The brush carriage 15 of Xing Chenging is assemblied on the casing cover 6, as shown in Figure 5 securely by will fixture 20 inserting the installing hole 25 that provides on the casing covers 6 and head of fixture 20 is crooked in the above described manner.
Fig. 7 A is the auxiliary enlarged drawing in order to the link 16 shown in the key diagram 3 to 5.Fig. 7 B and 7C are the views of seeing with the direction of the arrow B of Fig. 7 A and C respectively.In Fig. 7 A to 7C, the flat shape of link 16 is U-shaped substantially, and its opening end 16a and 16b stretch out slightly.The length of opening end 16a is slightly less than another opening end 16b, so that PTC resistor 49 is set, shown in Fig. 3 and 4.
Form pair of terminal 17 by a part that is bent upwards link 16 in the edge of opening end 16a and 16b integral body.On terminal 17, form otch 17a.Form pair of terminal 18 by a part that is bent upwards link 16 in another edge integral body of opening end 16b.On terminal 18, form punching press and bool 18a.
Fig. 8 A and 8B are the plane graph of amplification of the input terminal 8 shown in Fig. 3 to 5 and the end view of amplification.In Fig. 8 A and 8B, reference number 23 expression stop portions, it is that than top, its width is greater than middle body for input terminal 8 (in inner face one side of casing cover 6).Stop portions 23 is used for securely input terminal 8 being assembled to casing cover 6, and its process is that stop portions 23 is passed casing cover 6, as shown in Figure 4, holds it in original position, and will before push away and lift parts 52 crooked right angles.What reference number 24 expression was formed on input terminal 8 pushes away and lifts parts before near the upper end.Reference number 26 expressions are used for connecting the gap of capacitor and other functional element.
By input terminal 8, link 16 and the brush carriage 15 that forms in the above described manner is installed, and insert PTC resistor 49 on the casing cover shown in Fig. 3 to 56, can keep the electrical connection between these parts.In other words, input terminal 8 contacts with the ledge 22 that before pushes away with lifting parts 24 and fixture 21 with link 16.When PTC resistor 49 inserted between input terminal 8 and the link 16, preceding pushing away with the ledge 22 that lifts parts 24 and fixture 21 contacted with the surface of PTC resistor 49.
In this state, be pulled outwardly PTC resistor 49 among Fig. 4 even apply an external force, be formed on the input terminal 8 before push away and lift the surface that parts 24 snap in PTC resistor 49, strengthened the clamping effect.In addition, the thrust piece 21b that is formed on the fixture 21 of link 16 contacts with the surface of PTC resistor 49, has improved and PTC resistor 49 stability in contact.
When the end of pigtail 14 linked to each other with the terminal 18 of link 16 by welding, the arm portion 13a of pigtail 14 winding screw torsionsprings 13 was shown in Fig. 3 and 4.Promptly in Fig. 3, pigtail 14 is pulled out from the upper end of brush 45, and twines arm portion 13a, stretches to terminal 18 then.Helical torsional spring 13 and terminal 18 preferably should be in the same sides of the brush carriage on the inner face of casing cover 6 15, and close mutually.
For said structure, the slackness of pigtail 14 is enough, but has avoided lead-in wire undue lax simultaneously again.Even when brush 45 was mobile in brush carriage 15, pigtail 14 also will not be strained undesiredly, because pigtail 14 and arm portion 13a swing together.So brush 45 can move in brush carriage 15 smoothly.
Fig. 9 represents the inner face of the casing cover 6 of the second embodiment of the present invention.The part identical with Fig. 3 represented with identical reference number.Remove and omitted a link 16 and pigtail 14 directly with beyond an input terminal 8 links to each other, the embodiment among Fig. 9 is identical with first embodiment.Therefore brush 45 can move in brush carriage 15 smoothly, has prevented undesirable lax and abnormal tension of pigtail 14 simultaneously.
The inner face of the casing cover 6 of Figure 10 and 11 expressions, third and fourth embodiment of the present invention.The part identical with Fig. 9 represented with identical reference number.By input terminal 8 is placed in axisymmetric mode, shown in Figure 10 and 11, two pigtails 14 can directly contact with input terminal 8, and without the link 16 shown in Fig. 3 and 9.
In the present invention, pigtail 14 can link to each other with the end on the brush carriage 15, and choke can be connected between the terminal 18 of this end and link 16.In addition, by omitting PTC resistor 49, input terminal 8 directly can be linked to each other with link 16.In brief, according to the specification of desired electrical micro-machine, electric control element such as capacitor, choke and the PTC resistor of any kind can be packed into selectively.
The present invention with said structure and running has reached following effect:
(1) can be with the shortest desired pigtail to the brush feed power supply, like this Can not cause undesirable relaxing, therefore can prevent the phase mutual interference with other parts.
(2) owing to needn't worry to be applied to the abnormal stress that is caused by pigtail or external force on the brush, so brush can move smoothly, and brush can be with stable status and commutator sliding contact.This has stablized the performance of motor, and has prolonged the life-span of motor.
(3) even under the situation that the distance between rotor and the power feed parts shortens, owing to the phase mutual interference that has prevented between the two, so also can make the further miniaturization of motor.
(4) because the distribution of the link that stretches out on the end face of casing cover is point-symmetric about the motor central shaft, thus number of components and parts can be reduced, so reduced the cost of parts quality control and manufacturing.
Claims (6)
1. electrical micro-machine, comprise: by the shell that metal material is made, shell is hollow barrel-shaped that the end is arranged, and has the permanent magnet that is installed to securely on the inner circumferential surface, have the rotor of armature core and commutator, and the casing cover that is assembled to an opening end of described shell; On described casing cover, provide the support brush and make itself and a pair of brush carriage of described commutator sliding contact and the pair of input terminals that is electrically connected with described brush by pigtail or other conductive component; Described rotor is supported by the rotation of the bearing on described outer casing bottom and the described casing cover, it is characterized in that being formed on the inner face of described casing cover, and described link directly or by other conductive component links to each other with an input terminal by the link that electric conducting material is made; Described link links to each other by one in pigtail and the described brush, and another described brush links to each other with another input terminal by pigtail; Arm portion by helical torsional spring contacts described brush prestrain with the outer end of described brush, press to described commutator so described brush is stressed, and described pigtail twines described arm portion.
2. electrical micro-machine as claimed in claim 1 is characterized in that providing the resistor of positive temperature coefficient between standing part of described link and described input terminal.
3. electrical micro-machine, comprise: by the shell that metal material is made, shell is hollow barrel-shaped that the end is arranged, and has the permanent magnet that is installed to securely on the inner circumferential surface, have the rotor of armature core and commutator, and the casing cover that is assembled to an opening end of described shell; On described casing cover, provide the support brush and make itself and a pair of brush carriage of described commutator sliding contact and the pair of input terminals that is electrically connected with described brush by pigtail or other conductive component; Described rotor is supported by the rotation of the bearing on described outer casing bottom and the described casing cover, it is characterized in that a pair of link made by electric conducting material is formed on the inner face of described casing cover with the state of mutually insulated, a link links to each other with an input terminal by another conductive component, and another link directly links to each other with another input terminal; Between described link, connect a capacitor, described link links to each other with described brush by pigtail, arm portion by helical torsional spring contacts with the outer end of described brush described brush prestrain, press to described commutator so described brush is stressed, and described pigtail twines described arm portion.
4. electrical micro-machine as claimed in claim 3 is characterized in that a pair of described brush carriage outstanding on the end face of described casing cover and the distribution of a pair of described link are point-symmetric about the motor central shaft.
5. electrical micro-machine as claimed in claim 3 is characterized in that providing the resistor of positive temperature coefficient between standing part of described link and described input terminal.
6. electrical micro-machine, comprise: by the shell that metal material is made, shell is hollow barrel-shaped that the end is arranged, and has the permanent magnet that is installed to securely on the inner circumferential surface, have the rotor of armature core and commutator, and the casing cover that is assembled to an opening end of described shell; On described casing cover, provide the support brush and make itself and a pair of brush carriage of described commutator sliding contact and the pair of input terminals that is electrically connected with described brush by pigtail or other conductive component; Described rotor is supported by the rotation of the bearing on described outer casing bottom and the described casing cover, it is characterized in that contacting with the outer end of described brush described brush prestrain by the arm portion of helical torsional spring, press to described commutator so described brush is stressed, and described pigtail twines described arm portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP108075/94 | 1994-05-23 | ||
| JP6108075A JP2763493B2 (en) | 1994-05-23 | 1994-05-23 | Small motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1115513A true CN1115513A (en) | 1996-01-24 |
| CN1046064C CN1046064C (en) | 1999-10-27 |
Family
ID=14475250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95105820A Expired - Fee Related CN1046064C (en) | 1994-05-23 | 1995-05-23 | Miniature motor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2763493B2 (en) |
| CN (1) | CN1046064C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064639A (en) * | 2009-11-13 | 2011-05-18 | 阿斯莫有限公司 | Electric motor |
| CN101409480B (en) * | 2007-08-30 | 2011-06-15 | 阿尔卡特朗讯 | Structure for an electric motor, and electric motor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111659710B (en) * | 2020-06-18 | 2023-05-23 | 牟恒志 | Medical waste disinfection treatment equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0543758U (en) * | 1991-11-11 | 1993-06-11 | 株式会社三ツ葉電機製作所 | Support structure for brush holder stay in fan motor |
| JPH0629379U (en) * | 1992-06-15 | 1994-04-15 | 国産電機株式会社 | Rectifier for DC motor |
-
1994
- 1994-05-23 JP JP6108075A patent/JP2763493B2/en not_active Expired - Fee Related
-
1995
- 1995-05-23 CN CN95105820A patent/CN1046064C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101409480B (en) * | 2007-08-30 | 2011-06-15 | 阿尔卡特朗讯 | Structure for an electric motor, and electric motor |
| CN102064639A (en) * | 2009-11-13 | 2011-05-18 | 阿斯莫有限公司 | Electric motor |
| CN102064639B (en) * | 2009-11-13 | 2013-07-31 | 阿斯莫有限公司 | Electric motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1046064C (en) | 1999-10-27 |
| JPH07322570A (en) | 1995-12-08 |
| JP2763493B2 (en) | 1998-06-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Huayuan motor (Jiangsu) Co., Ltd. Assignor: Mabuchi Motor Co., Ltd. Contract fulfillment period: The period of performance of the contract is 2004-05-01 to the contract period Contract record no.: Contract filing No. 041000030097 Denomination of invention: Invention name micro motor Granted publication date: 19991027 License type: License type general permission Record date: 20041022 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: COMMON LICENCE; TIME LIMIT OF IMPLEMENTING CONTACT:2004-05-01 TO CONTRACT Name of requester: HUAYUAN MOTOR (JIANGSU) CO., LTD. Effective date: 20041022 |
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Dalian wanbaozhi Motor Co. Ltd. Assignor: Mabuchi Motor Co., Ltd. Contract record no.: 2010990000712 Denomination of invention: A screw thread driving polyhedral supersonic micro motor with pre-pressure mechanism Granted publication date: 19991027 License type: Common License Open date: 19960124 Record date: 20100903 Assignee: Mabuchi motor (Dongguan) Co., Ltd. Assignor: Mabuchi Motor Co., Ltd. Contract record no.: 2010990000650 Denomination of invention: A screw thread driving polyhedral supersonic micro motor with pre-pressure mechanism Granted publication date: 19991027 License type: Common License Open date: 19960124 Record date: 20100903 |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 19991027 Termination date: 20110523 |