JPH09273559A - Bearing seal - Google Patents
Bearing sealInfo
- Publication number
- JPH09273559A JPH09273559A JP10452296A JP10452296A JPH09273559A JP H09273559 A JPH09273559 A JP H09273559A JP 10452296 A JP10452296 A JP 10452296A JP 10452296 A JP10452296 A JP 10452296A JP H09273559 A JPH09273559 A JP H09273559A
- Authority
- JP
- Japan
- Prior art keywords
- reinforcing plate
- sealing material
- plate
- elastic sealing
- bearing seal
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
- F16C33/7843—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc
- F16C33/7853—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc with one or more sealing lips to contact the inner race
- F16C33/7856—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc with one or more sealing lips to contact the inner race with a single sealing lip
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
- F16C33/7833—Special methods of manufacture
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、連続して大量に形
成でき、かつ仕上げ処理を不要として全体強度と密封性
に優れるベアリングシールに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing seal which can be continuously formed in a large amount and which does not require finishing treatment and is excellent in overall strength and sealing performance.
【0002】[0002]
【課題を解決しようとする手段】本発明は、相対回転す
るベアリングに取り付けられ、その密封をなすベアリン
グシールであって、所望形状を持つ成形型(1)へ接着
剤等を塗布形成した金属製薄板からなる補強板(2)を
投入し、合成ゴムあるいは合成樹脂等の生地状の弾性密
封材料(A3)と共にこれを加圧成形せしめて、該弾性
密封材料(A3)の流動圧力によって補強板(2)に凹
凸を型造形し一体化された積層板(a)を得さしめ、そ
の後に前記積層板(a)を所望径のプレスパンチ(4)
で打ち抜いて前記弾性密封材(3)から形成される密封
リング(3a)の周縁が前記補強板(2)から形成され
る補強環(2a)の周縁から突出するリップ部(3b)
を形成したベアリングシールを得ることを特徴とするも
のである。DISCLOSURE OF THE INVENTION The present invention is a bearing seal which is attached to a bearing which rotates relative to each other and seals the bearing. The bearing seal is made of metal and is formed by applying an adhesive or the like to a mold (1) having a desired shape. A reinforcing plate (2) made of a thin plate is introduced, and the elastic sealing material (A3) in the form of cloth such as synthetic rubber or synthetic resin is pressure-molded, and the reinforcing plate is applied by the flow pressure of the elastic sealing material (A3). The unevenness is molded in (2) to obtain an integrated laminated plate (a), and then the laminated plate (a) is pressed with a press punch (4) having a desired diameter.
A lip portion (3b) that is punched out with a peripheral edge of a sealing ring (3a) formed of the elastic sealing material (3) and protrudes from a peripheral edge of a reinforcing ring (2a) formed of the reinforcing plate (2).
The present invention is characterized in that a bearing seal formed with is obtained.
【0003】[0003]
【発明が解決しようとする課題】特開昭54−6888
2号公報に示す従来の簡便な打抜きタイプのベアリング
シールは、図面を基に説明すると図4に示すように、そ
の簡素な構造ゆえに小径サイズが多く、このような小径
のベアリングに装着する場合ではベアリングシールの装
着スペースに余裕が極めて少ないため、ベアリング内の
転がり体(5)を抱持するリテーナー(6)と干渉する
恐れがあり、この干渉を避けるために前記接触の恐れの
ある部分の肉圧を薄く形成する(類似した成形法として
プレモールド成形法も実施可能。)か、あるいは前記干
渉部分を凸形状に迂回造形して両部位を離間させる必要
がある。Problems to be Solved by the Invention JP-A-54-6888
The conventional simple punching type bearing seal shown in Japanese Patent Publication No. 2 has a large diameter due to its simple structure as shown in FIG. Since the bearing seal has a very small mounting space, it may interfere with the retainer (6) that holds the rolling body (5) in the bearing, and in order to avoid this interference, the meat of the portion that may be in contact with the retainer (6). It is necessary to form the pressure thinly (a pre-molding method can also be performed as a similar molding method) or to detour-form the interference portion into a convex shape to separate the two portions.
【0004】このようなベアリングシールの造形におい
ては、平面状の補強板(2)へ弾性密封材(3)を積層
形成し、その後に図5で示すようにプレスパンチ(4)
で打抜き加工して変形応力を加える場合、前記補強板
(2)へは前記形成され柔軟性の高い弾性密封材(3)
を通して変形荷重が加わるため正確な形状を圧縮造形す
ることができない。また、補強板(2)を予め変形造形
し、その後に弾性密封材料(A3)を積層形成する場
合、弾性密封材料(A3)の型加硫において前記補強板
(2)が熱膨張して径ピッチを狂わせ易く型内に正確に
載置できない構造的欠点を有しており、造形精度と密封
性能の向上を果たし得ない大きな原因の一つとなってい
る。In manufacturing such a bearing seal, an elastic sealing material (3) is laminated on a flat reinforcing plate (2), and then a press punch (4) is formed as shown in FIG.
When a deformation stress is applied by punching with, the elastic sealing material (3) having high flexibility is formed on the reinforcing plate (2).
Since a deformation load is applied through it, it is not possible to perform compression molding of an accurate shape. Further, when the reinforcing plate (2) is preliminarily deformed and shaped, and then the elastic sealing material (A3) is laminated and formed, the reinforcing plate (2) is thermally expanded in the mold vulcanization of the elastic sealing material (A3) and the diameter thereof is increased. It has a structural defect that the pitch can be easily changed and cannot be placed accurately in the mold, which is one of the major reasons that the molding accuracy and sealing performance cannot be improved.
【0005】本発明はこのような欠点に鑑み、予備加工
成形を不要とし成形型(1)に補強板(2)の変形造形
が成形圧によって成形時に同時になされる製造コストに
優れるベアリングシールを提供することを目的としてい
る。In view of the above drawbacks, the present invention provides a bearing seal which does not require pre-forming and is capable of deforming the reinforcing plate (2) on the molding die (1) at the same time by molding pressure at the time of molding, which is excellent in manufacturing cost. The purpose is to do.
【0006】[0006]
【従来の技術】近年、ベアリングに装着されるベアリン
グシールは、図面によって説明すると図4に示すよう
に、金属等からなる補強板(2)へ弾性体からなる弾性
密封材(3)を形成し、該補強板(2)と共に弾性密封
材(3)も同時にプレスパンチ(4)で打ち抜いてその
周縁が前記補強板(2)で形成される補強リング(7)
の周縁より突出するリップ部(3b)を形成したベアリ
ングシールを得る極めて簡便な打抜きタイプの製造法が
実施されている。(特開昭54−68882号公報を参
照)2. Description of the Related Art In recent years, a bearing seal mounted on a bearing has a resilient plate (2) made of metal or the like and an elastic sealing material (3) made of an elastic body formed on the reinforcing plate (2) as shown in FIG. A reinforcing ring (7) whose peripheral edge is formed by the reinforcing plate (2) by punching the elastic sealant (3) together with the reinforcing plate (2) with a press punch (4) at the same time.
A very simple punching type manufacturing method for obtaining a bearing seal having a lip portion (3b) projecting from the peripheral edge thereof has been carried out. (See JP-A-54-68882)
【0007】[0007]
【発明の実施の形態】本発明は、上記した構成をもって
下記に示す優れた作用をなす。まず、図1に示すよう
に、金属製の薄板へ脱脂・接着剤塗布等の表面処理を施
した補強板(2)を用意し、合成ゴムあるいは合成樹脂
等の生地状態の弾性密封材料(A3)と共に前記補強板
(2)を凹凸形状の刻設された成形型(1)内へ挟み投
入せしめる。その後、図2に示すようにこれを加圧成形
せしめると、補強板(2)上の弾性密封材料(A3)が
横流れをするための抵抗圧力によって補強板(2)は加
圧方向に変形を起こし、該補強板(2)が前記成形型
(1)の凹凸形状に沿って塑性変形し、これに弾性密封
材(3)が加硫一体化された積層板(a)を得る。ま
た、予め成形型(1)に補強板(2)を挟み込んで該補
強板(2)と成形型(1)の型内に弾性密封材料(A
3)を注入し、該注入圧力によって補強板(2)を型の
凹凸形状に沿わせる方法もある。(図示していない。) この後に前記積層板(a)をプレスパンチ(4)にて、
弾性密封材(3)の保持する圧縮変形量及び弾性反発力
の違いを利用して打ち抜き、図3に示す如く前記弾性密
封材(3)から形成される密封リング(3a)の周縁が
前記補強板(2)から形成される補強環(2a)の周縁
からリング状に突出するリップ部(3b)を形成したベ
アリングシールを得る。BEST MODE FOR CARRYING OUT THE INVENTION The present invention having the above-mentioned constitution has the following excellent effects. First, as shown in FIG. 1, a reinforcing plate (2), which has been subjected to surface treatment such as degreasing / adhesive coating on a thin metal plate, is prepared, and a synthetic rubber or synthetic resin or the like elastic sealing material (A3 ) And the reinforcing plate (2) is inserted into a mold (1) having concave and convex shapes. Then, as shown in FIG. 2, when this is pressure-molded, the reinforcing plate (2) is deformed in the pressing direction due to the resistance pressure for the elastic sealing material (A3) on the reinforcing plate (2) to flow laterally. Then, the reinforcing plate (2) is plastically deformed along the concavo-convex shape of the mold (1), and the elastic sealing material (3) is vulcanized and integrated to obtain a laminated plate (a). In addition, the reinforcing plate (2) is sandwiched between the molding die (1) in advance, and the elastic sealing material (A
There is also a method of injecting 3) and causing the reinforcing plate (2) to follow the uneven shape of the mold by the injection pressure. (Not shown.) After that, the laminated plate (a) is pressed by a press punch (4).
The elastic sealing material (3) is punched by utilizing the difference in the amount of compressive deformation and elastic repulsion force, and as shown in FIG. 3, the peripheral edge of the sealing ring (3a) formed from the elastic sealing material (3) is reinforced by the reinforcement. A bearing seal having a lip portion (3b) protruding in a ring shape from the peripheral edge of a reinforcing ring (2a) formed of a plate (2) is obtained.
【0008】このようにして形成されたベアリングシー
ルは図4に示す如く、凹凸形状及び径寸法さらにはリッ
プ部(3b)の形状まで精度よく造形され、高い剛性を
持って優れた密封性能を発揮するものとなるAs shown in FIG. 4, the bearing seal formed in this manner is accurately shaped to have a concave and convex shape, a diameter dimension, and a lip portion (3b) shape, and has high rigidity and excellent sealing performance. Will be
【0009】[0009]
【実施例】本発明を実施するに、補強板(2)は0.0
5mmから1.2mmの板厚みの金属製薄板から形成
し、この補強板(2)へ圧縮形成する形状においては、
図3で示した如くの転がり体(5)のリテーナー(6)
と干渉させない迂回凸形状の他、その剛性の向上を主目
的とした図6の構造、あるいは他の作用を付与せしめる
ための図7あるいは図8に示す如くの複雑な凹凸を持つ
形状に造形することも可能である。これを詳しく説明す
ると、図6ではベアリングシールの平面部へリング状の
凸部(c1)を設けており、周面全体の強度を向上せし
めている。また、図7で示した凹凸形状においては、断
続的な凸条(c2)を設けて、内部の潤滑油の保持を該
凸条(c2)の裏面の凹み部に期待している。また、図
8で示す構造は周縁に波状凹凸(c3)を形成し、該波
状凹凸(c3)の抵抗攪拌作用によって付着しようとす
るダストとか水滴の飛散・振切り効果などを発生せしめ
る。EXAMPLES In carrying out the present invention, the reinforcing plate (2) is 0.0
In the shape formed from a thin metal plate having a plate thickness of 5 mm to 1.2 mm and compression-formed into the reinforcing plate (2),
Retainer (6) for rolling element (5) as shown in FIG.
In addition to the detour convex shape that does not interfere with the structure, the structure of FIG. 6 is mainly formed to improve its rigidity, or a shape having complex unevenness as shown in FIG. 7 or FIG. 8 for giving other action is formed. It is also possible. This will be described in detail. In FIG. 6, a ring-shaped convex portion (c1) is provided on the flat surface portion of the bearing seal to improve the strength of the entire peripheral surface. Further, in the concavo-convex shape shown in FIG. 7, the intermittent ridges (c2) are provided, and it is expected that the internal lubricating oil will be retained in the recesses on the back surface of the ridges (c2). In addition, the structure shown in FIG. 8 forms a wavy unevenness (c3) on the peripheral edge, and the resistance stirring action of the wavy unevenness (c3) causes a scattering / shaking effect of dust or water drops to be attached.
【0010】次に、積層板(a)の弾性密封材(3)の
造形においては、図2に示すように合成ゴムあるいは合
成樹脂等からなる弾性密封材料(A3)にて型形成する
が、圧縮により成形型(1)内で補強板(2)と共に型
の凹凸に沿って変形して造形されるので該両部材(2)
(3)はぴったり密着し、弾性密封材料(A3)の流れ
不良、接着不良等の成形不良を一掃する。勿論、ここで
用いる弾性密封材料(A3)においては、合成ゴムでは
密封材に一般的に使用されるニトリルゴムからアクリル
ゴムあるいはフッ素ゴム等まで、合成樹脂では熱可塑性
樹脂などそれぞれ要求される性能に応じて自由に選択で
きる。Next, in forming the elastic sealing material (3) of the laminated plate (a), as shown in FIG. 2, the elastic sealing material (A3) made of synthetic rubber or synthetic resin is used to form a mold. Since both the members (2) are deformed and shaped along with the reinforcing plate (2) in the molding die (1) along with the unevenness of the die by compression.
(3) closely adheres to eliminate molding defects such as defective flow of the elastic sealing material (A3) and defective adhesion. Of course, in the elastic sealing material (A3) used here, synthetic rubbers such as nitrile rubber or acrylic rubber or fluororubber, which are generally used as sealing materials, and synthetic resins, such as thermoplastic resin, are required to meet required performances. You can freely select it according to your needs.
【0011】[0011]
【発明の効果】本発明によると、ベアリングシールの成
形時に弾性密封材料(A3)と共に補強板(2)まで同
時に成形型(1)によって凹凸造形され、該変形造形に
よってその剛性を飛躍的に高めると共に省スペース化を
実現する。このベアリングシールでは複雑な造形が可能
となるので、打抜きタイプの成形方法であっても、従来
の如くのミニチュアベアリングのような極小箇所のシー
ル部材に限定されないものとなり、一般的な大径のベア
リングシールにまで対応できる造形自由度を持ち、安価
で大量の生産を実現した。According to the present invention, at the time of molding a bearing seal, the elastic sealing material (A3) and the reinforcing plate (2) are simultaneously shaped by the molding die (1), and the rigidity is dramatically increased by the deformation molding. Along with this, space saving is realized. Since this bearing seal enables complex molding, even with the punching type molding method, it is not limited to the seal member of the minimum position such as the conventional miniature bearing, and a general large diameter bearing It has a high degree of freedom in molding that can handle even seals, and has achieved mass production at low cost.
【図1】本発明を形成する実施例を示す断面図である。1 is a cross-sectional view showing an embodiment forming the present invention.
【図2】図1から圧縮状態を示す断面図である。FIG. 2 is a sectional view showing a compressed state from FIG.
【図3】本発明の形成された状態を示す断面図である。FIG. 3 is a cross-sectional view showing a formed state of the present invention.
【図4】ベアリングシールが装着された状態を示す断面
図である。FIG. 4 is a cross-sectional view showing a state in which a bearing seal is mounted.
【図5】従来の打抜きタイプの成形方法を示す略断面図
である。FIG. 5 is a schematic cross-sectional view showing a conventional punching type molding method.
【図6】本発明によって形成された一実施例を示す斜視
断面図である。FIG. 6 is a perspective sectional view showing an embodiment formed according to the present invention.
【図7】本発明によって形成された他の実施例を示す斜
視断面図である。FIG. 7 is a perspective sectional view showing another embodiment formed according to the present invention.
【図8】本発明によって形成された他の実施例を示す斜
視断面図である。FIG. 8 is a perspective sectional view showing another embodiment formed according to the present invention.
1 成形型 2 補強板 3 弾性密封材 2a 補強環 3a 密封リング 3b リップ部 4 プレスパンチ 5 転がり体 6 リテーナー 7 補強リング A3 弾性密封材料 a 積層板 c1 リング状の凸部 c2 断続的な凸条 c3 波状凹凸 1 Mold 2 Reinforcement Plate 3 Elastic Sealing Material 2a Reinforcing Ring 3a Sealing Ring 3b Lip Part 4 Press Punch 5 Rolling Body 6 Retainer 7 Reinforcement Ring A3 Elastic Sealing Material a Laminated Plate c1 Ring-shaped Convex c2 Intermittent Convex c3 Wavy unevenness
Claims (5)
なすベアリングシールにおいて、 所望形状を持つ成形型に金属製薄板からなる補強板を投
入し、弾性密封材料と共に加圧成形せしめて弾性密封材
料の流動圧によって補強板を所望形状に型造形させ、一
体化された補強板と弾性密封材からなる積層板を得、 その後前記積層板をプレスパンチで打ち抜いて前記弾性
密封材から形成される密封リングの周縁が前記補強板か
ら形成される補強環の周縁から突出するリップ部を形成
せしめたことを特徴とするベアリングシール。1. In a bearing seal mounted on a bearing to seal the inside and outside of the bearing, a reinforcing plate made of a thin metal plate is put into a molding die having a desired shape, and the elastic sealing material is pressure-molded to form an elastic sealing material. A reinforcing plate is molded into a desired shape by fluid pressure to obtain a laminated plate including the integrated reinforcing plate and elastic sealing material, and then the laminated plate is punched with a press punch to form a sealing ring formed from the elastic sealing material. The bearing seal is characterized in that a peripheral edge of the reinforcing ring is formed with a lip portion projecting from the peripheral edge of the reinforcing ring.
0.05mmから1.2mmの板厚みであることを特徴
とする請求項1のベアリングシール。2. The thin metal plate forming the reinforcing plate,
The bearing seal according to claim 1, which has a plate thickness of 0.05 mm to 1.2 mm.
において、 成形型に金属製薄板からなる補強板を投入し、弾性密封
材料と共に加圧成形せしめて弾性密封材料の流動圧によ
って補強板の平面部へリング状の凸部を設けたことを特
徴とした請求項1ないし2のベアリングシール。3. In the laminated plate forming the bearing seal, a reinforcing plate made of a thin metal plate is put into a forming die, pressure-molded together with an elastic sealing material, and a flat portion of the reinforcing plate is generated by a flow pressure of the elastic sealing material. 3. The bearing seal according to claim 1, wherein a herring-shaped convex portion is provided.
において、 成形型に金属製薄板からなる補強板を投入し、弾性密封
材料と共に加圧成形せしめて弾性密封材料の流動圧によ
って補強板の平面部へリング状に断続する凸条を設けた
ことを特徴とした請求項1ないし2のベアリングシー
ル。4. In the laminated plate forming the bearing seal, a reinforcing plate made of a thin metal plate is put into a molding die, pressure-molded together with an elastic sealing material, and a flat portion of the reinforcing plate is generated by a flow pressure of the elastic sealing material. 3. The bearing seal according to claim 1, further comprising a protruding strip that is intermittent in a herring shape.
において、 成形型に金属製薄板からなる補強板を投入し、弾性密封
材料と共に加圧成形せしめて弾性密封材料の流動圧によ
って補強板の周縁に波状凹凸を設けたことを特徴とした
請求項1ないし2のベアリングシール。5. In the laminated plate forming the bearing seal, a reinforcing plate made of a thin metal plate is put into a molding die, pressure-molded together with the elastic sealing material, and the peripheral pressure of the reinforcing plate is applied by the flow pressure of the elastic sealing material. 3. The bearing seal according to claim 1, wherein wavy unevenness is provided.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10452296A JP3435533B2 (en) | 1996-04-01 | 1996-04-01 | Bearing seal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10452296A JP3435533B2 (en) | 1996-04-01 | 1996-04-01 | Bearing seal |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09273559A true JPH09273559A (en) | 1997-10-21 |
JP3435533B2 JP3435533B2 (en) | 2003-08-11 |
Family
ID=14382834
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10452296A Expired - Fee Related JP3435533B2 (en) | 1996-04-01 | 1996-04-01 | Bearing seal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3435533B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000346084A (en) * | 1999-06-10 | 2000-12-12 | Uchiyama Mfg Corp | Bearing seal |
JP2014077499A (en) * | 2012-10-11 | 2014-05-01 | Nsk Ltd | Hub unit bearing and method of transporting hub unit bearing |
WO2017099159A1 (en) * | 2015-12-09 | 2017-06-15 | オイレス工業株式会社 | Sliding bearing |
-
1996
- 1996-04-01 JP JP10452296A patent/JP3435533B2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000346084A (en) * | 1999-06-10 | 2000-12-12 | Uchiyama Mfg Corp | Bearing seal |
JP2014077499A (en) * | 2012-10-11 | 2014-05-01 | Nsk Ltd | Hub unit bearing and method of transporting hub unit bearing |
WO2017099159A1 (en) * | 2015-12-09 | 2017-06-15 | オイレス工業株式会社 | Sliding bearing |
Also Published As
Publication number | Publication date |
---|---|
JP3435533B2 (en) | 2003-08-11 |
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