JP4104412B2 - Thin thermal fuse - Google Patents

Thin thermal fuse Download PDF

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Publication number
JP4104412B2
JP4104412B2 JP2002286645A JP2002286645A JP4104412B2 JP 4104412 B2 JP4104412 B2 JP 4104412B2 JP 2002286645 A JP2002286645 A JP 2002286645A JP 2002286645 A JP2002286645 A JP 2002286645A JP 4104412 B2 JP4104412 B2 JP 4104412B2
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Japan
Prior art keywords
protrusion
protrusions
insulating substrate
pair
bank
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Expired - Fee Related
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JP2002286645A
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Japanese (ja)
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JP2004127570A (en
Inventor
芳男 浅見
佳孝 佐藤
伸一 加藤
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安全電具株式会社
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Description

【0001】
【発明の属する技術分野】
この発明は、民生および産機用の小型トランスや電源回路内に組み込まれるヒートシンク、ダイオード、パワートランジスタ、IC等の電子部品へ取付け、この種電子部品の加熱保護を目的とする無復帰型の温度ヒューズに関する。
【0002】
【従来の技術】
従来、一般的に使用されているこの種の温度ヒューズとしては、図7に示すように、円筒状のケース1’内には、周囲にロジン系フラックス11’が塗布されたヒューズエレメント3’が収納され、このヒューズエレメント3’の両端にそれぞれリード線2’が接続され、これらのリード線2’は封止剤a’から外部に露出した構造となっている。
【0003】
【発明が解決しようとする課題】
この場合、各リード線(2’)の内端はそれぞれヒューズエレメント(3’)の端部に単に接続されているため、リード線(2’)の引張り強度が弱く信頼性に欠けるという課題があった。
【0004】
また、組立てにあたり、リード線2’の位置決め手段もなく、組立性が良好でない、という課題もあった。
【0005】
この発明は上記のことに鑑み提案されたもので、その目的とするところは、リード線の引張り強度の向上化を図り、信頼性を向上させ、また、組立性も良好とし、かつ不良率を低減し得る、薄型の温度ヒューズを提供することにある。
【0006】
【課題を解決するための手段】
この発明は、薄型絶縁体を構成し、下ケースとして機能する平面形状がほぼ長方形をなす絶縁基板(1)の上面両側に、その各長辺(5)に沿って延びる一対の突部(7)をそれぞれ形成し、これら突部(7)間に凹部(8)を形成するとともに、凹部(8)の両端に土手状の突部(9)をそれぞれ形成し、これら突部(9)は前記絶縁基板(1)の短辺(6)側に位置し、かつ前記凹部(8)に内端部分が収納される一対の帯状のリード導体(2)の内端部に前記突部(9)に対応した形状をなし、係合可能な位置決め用の係合部(10)をそれぞれ形成し、収納された一対のリード導体(2)の対応する内端間をヒューズエレメント(3)で接続するとともに、前記絶縁基板(1)の上部に上ケースとして機能する蓋(4)を封止剤を介して取付ける構成として上記目的を達成している。
【0007】
また、封止剤は長辺(5)側に沿って延びる突部(7)および凹部(8)内において短辺(6)側に形成された突部(9)の外側に注入されることを特徴とする。
【0008】
また、土手状の突部(9)は断面ほぼ矩形、台形または半円形に形成され、リード導体(2)の係合部(10)はこれと対応した形状に形成されることを特徴としている。
【0009】
【発明の実施の形態】
この発明では、リード導体2が取付けられる絶縁基台1にリード導体位置決め兼取付け用の土手状の突部9を形成し、これにより組立性を良くするとともに、リード導体2の引張り強度を向上させている。また、この突部9により、周囲に塗布した封止剤のヒューズエレメント3側への侵入を阻止するようにし、不良率の低減化を図っている。
【0010】
【実施例1】
図1は本発明の一実施例の分解斜視図を示す。この薄型温度ヒューズは、下ケースとして機能する絶縁基板(1)、絶縁基板(1)に組込まれる薄型平板状の一対のリード導体(2)、この一対のリード導体(2)を接続するヒューズエレメント(3)、絶縁基板(4)に被せられる、上ケースとして機能する薄板状の蓋(4)とを備えている。
【0011】
絶縁基板(1)は、全体の外形の形状は平面から見て長辺(5)と短辺(6)とからなるほぼ長方形をなし、セラミック、またはPBT等からなる絶縁性の樹脂成形品等からなり、かつ、同材料からなる蓋(4)とともに薄型絶縁体を構成する。
【0012】
この絶縁基板(1)の上面両側には長辺(5)の長さ方向に沿って延びる突部(7)がそれぞれ形成されている。そして、これら突部(7)間であって各短辺(6)にわたってリード導体配設用の帯状をなす凹部(8)が形成されている。なお、突部(7)の各端部は短辺(6)まで達せずその内側に位置している。
【0013】
凹部(8)の長さ方向の両端部にはリード導体位置決め兼取付用の土手状の突部(9)がそれぞれ形成されている。
【0014】
これら土手状の突部(9)はそれぞれ短辺(6)側のやや内側に突設され、かつ各長辺(5)側に突設された一対の突部(7)間にわたって設けられている。
【0015】
一対のリード導体(2)は薄い帯状をなし、かつ内端部には突部(9)に対応した形状の係合部(10)が形成されている。この実施例では突部(9)が角柱状をなしているため、係合部(10)はその突部(9)の外周にほぼ密着するよう断面ほぼ逆凵字状の形状に形成されている。
【0016】
帯状をなす一対のリード導体(2)は凹部(8)内に収納されるよう凹部(8)とほぼ同じ幅寸法となっている。このリード導体(2)は、Cuメッキを施したNi板、Snメッキをした真ちゅう板またはSnメッキしたCu板からなる。
【0017】
また、一対のリード導体(2)は低融点のヒューズエレメント(3)によって接続される。ヒューズエレメント(3)は、BiとInからなる可溶合金、または、この可溶合金にSn,AgおよびCuの一種またはそれ以上を混合してなる。そして、上部に上ケースとしての蓋(4)が被せられる。この蓋(4)もセラミック、または絶縁性の樹脂成形品等からなり、平板状をなしている。
【0018】
組立てにあたっては、図2(a)、(b)に示すように、絶縁基板(1)上に一対のリード導体(2)を取付ける。各リード導体(2)はその係合部(10)を突部(9)上に位置させつつ凹部(8)内にその内端部分を取付ける。
【0019】
ついで、一対のリード導体(2)の内端部間に、図3に示すように、ヒューズエレメント(3)が半田付けによって接続される。
【0020】
ヒューズエレメント(3)の周囲には、図4に示すように、精製ロジンに活性剤を混合してなるロジン系のフラックス(11)が塗布される。
【0021】
これらの上部に絶縁基板(1)と外形がほぼ同様に形成された蓋(4)が被せられる。蓋(4)の内面は突部(9)上に設けられたリード導体(2)の上面と当接される。
【0022】
蓋(4)の取付けは、絶縁基板(1)の上面外周にエポキシ樹脂等の封止剤を塗布することによって取付けられる。この場合、絶縁基板(1)の長辺(5)側には長さ方向に沿って延びる突部(7)が形成され、また、短辺(6)側には土手状の突部(9)が形成され、係合部(10)が設けられているため、これら部材によりそれらの外側に塗布された封止剤がヒューズエレメント(3)側への内部侵入を阻止し得る。
【0023】
【実施例2】
図5は土手状の突部(1)をほぼ台形状にし、これと対応してリード導体(2)の係合部(10)もほぼ同形状とした例を示す。
【0024】
【実施例3】
図7は突部(9)を断面半円形にし、かつ係合部(10)も対応した形状とした例を示す。突部(9)、係合部(10)はその他の適形状としても良い。
【0025】
なお、第2、第3実施例において、他の構成、組立て等は前述の第1実施例と同様であるため、説明は省略する。
【0026】
【発明の効果】
以上のように請求項1記載の本発明によれば、各リード導体(2)はその係合部(10)を絶縁基板(1)の突部(9)に容易に位置決めしつつ所定位置に取付けることができ、リード導体(2)の引張り強度が向上し、よって信頼性が向上するとともに、組立性が良好である。
【0027】
請求項2記載によれば、位置決め用の突部(9)を介し封止剤が内部に侵入することを防止でき、不良率を低減し得る。
【0028】
請求項3記載によれば、突部(9)、係合部(10)を簡易形状としたため、製造が容易である。
【図面の簡単な説明】
【図1】本発明の第1実施例の分解斜視図を示す。
【図2】(a)は絶縁基板に一対のリード導体を取付けた状態を示す平面図、(b)は(a)中A−A線断面図を示す。
【図3】一対のリード導体間に可溶合金を取付けた状態を示す側断面図である。
【図4】一部破断で示した組立完成状態の平面図。
【図5】本発明の第2実施例を示す。
【図6】本発明の第3実施例を示す。
【図7】従来例を示す。
【符号の説明】
1 絶縁基板
2 リード導体
3 ヒューズエレメント
4 蓋
5 長辺
6 短辺
7 突部
8 凹部
9 突部
10 係合部
11 フラックス
[0001]
BACKGROUND OF THE INVENTION
This invention is a non-recoverable temperature for the purpose of heat protection of this kind of electronic component by attaching it to electronic components such as heat sinks, diodes, power transistors, ICs, etc. incorporated in small transformers for consumer and industrial machines and power supply circuits. Regarding fuses.
[0002]
[Prior art]
Conventionally, as this type of thermal fuse generally used, as shown in FIG. 7, a fuse element 3 ′ having a rosin flux 11 ′ applied around is provided in a cylindrical case 1 ′. The fuse element 3 ′ is housed, and lead wires 2 ′ are connected to both ends of the fuse element 3 ′. These lead wires 2 ′ are exposed to the outside from the sealant a ′.
[0003]
[Problems to be solved by the invention]
In this case, since the inner end of each lead wire (2 ′) is simply connected to the end of the fuse element (3 ′), the tensile strength of the lead wire (2 ′) is weak and unreliable. there were.
[0004]
In addition, there is a problem that there is no positioning means for the lead wire 2 ′ and the assemblability is not good.
[0005]
The present invention has been proposed in view of the above, and the object of the invention is to improve the tensile strength of the lead wire, improve the reliability, improve the assemblability, and reduce the defect rate. An object of the present invention is to provide a thin thermal fuse that can be reduced.
[0006]
[Means for Solving the Problems]
According to the present invention, a pair of protrusions (7) extending along the respective long sides (5) are formed on both sides of the upper surface of an insulating substrate (1) constituting a thin insulator and functioning as a lower case and having a substantially rectangular planar shape. ), And recesses (8) are formed between the protrusions (7), and bank-like protrusions (9) are formed at both ends of the recesses (8). The protrusions (9) The protrusions (9) are located on the inner end portions of a pair of strip-shaped lead conductors (2) located on the short side (6) side of the insulating substrate (1) and having the inner end portions accommodated in the recesses (8). ), The engaging portions (10) for positioning that can be engaged are formed, and the corresponding inner ends of the pair of stored lead conductors (2) are connected by the fuse element (3). At the same time, a lid (4) functioning as an upper case is placed on the insulating substrate (1) via a sealant. It has achieved the above objects as a mounting Te.
[0007]
Further, the sealant is injected outside the protrusion (9) formed on the short side (6) side in the protrusion (7) and the recess (8) extending along the long side (5) side. It is characterized by.
[0008]
Further, the bank-shaped protrusion (9) is formed in a substantially rectangular cross-section, trapezoidal shape, or semicircular shape, and the engaging portion (10) of the lead conductor (2) is formed in a shape corresponding thereto. .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
According to the present invention, a bank-like protrusion 9 for positioning and attaching the lead conductor is formed on the insulating base 1 to which the lead conductor 2 is attached, thereby improving the assemblability and improving the tensile strength of the lead conductor 2. ing. Further, the protrusion 9 prevents the sealing agent applied to the periphery from entering the fuse element 3 side, thereby reducing the defect rate.
[0010]
[Example 1]
FIG. 1 shows an exploded perspective view of an embodiment of the present invention. The thin thermal fuse includes an insulating substrate (1) functioning as a lower case, a pair of thin flat lead conductors (2) incorporated in the insulating substrate (1), and a fuse element for connecting the pair of lead conductors (2). (3) A thin plate-like lid (4) functioning as an upper case is provided on the insulating substrate (4).
[0011]
The overall shape of the insulating substrate (1) is a substantially rectangular shape consisting of the long side (5) and the short side (6) as viewed from above, and an insulating resin molded product made of ceramic or PBT, etc. And a thin insulator together with a lid (4) made of the same material.
[0012]
Projections (7) extending along the length direction of the long side (5) are formed on both sides of the upper surface of the insulating substrate (1). A recess (8) is formed between the protrusions (7) and has a strip shape for arranging the lead conductors over each short side (6). In addition, each edge part of the protrusion (7) does not reach the short side (6), but is located inside thereof.
[0013]
A bank-shaped protrusion (9) for positioning and mounting the lead conductor is formed at both ends of the recess (8) in the length direction.
[0014]
These bank-shaped protrusions (9) are provided so as to protrude slightly on the short side (6) side and between a pair of protrusions (7) protruding on the long side (5) side. Yes.
[0015]
The pair of lead conductors (2) has a thin band shape, and an engagement portion (10) having a shape corresponding to the protrusion (9) is formed at the inner end portion. In this embodiment, since the protrusion (9) has a prismatic shape, the engaging portion (10) is formed in a substantially inverted cross-sectional shape so as to be in close contact with the outer periphery of the protrusion (9). Yes.
[0016]
The pair of lead conductors (2) having a belt shape has substantially the same width as the recess (8) so as to be accommodated in the recess (8). The lead conductor (2) is made of a Ni plate plated with Cu, a brass plate plated with Sn, or a Cu plate plated with Sn.
[0017]
The pair of lead conductors (2) are connected by a low melting point fuse element (3). The fuse element (3) is made of a soluble alloy composed of Bi and In, or a mixture of one or more of Sn, Ag and Cu with this soluble alloy. And the cover (4) as an upper case is put on the upper part. The lid (4) is also made of ceramic or an insulating resin molded product and has a flat plate shape.
[0018]
In assembling, as shown in FIGS. 2A and 2B, a pair of lead conductors (2) is attached on the insulating substrate (1). Each lead conductor (2) attaches its inner end portion into the recess (8) with its engaging portion (10) positioned on the protrusion (9).
[0019]
Next, as shown in FIG. 3, the fuse element (3) is connected between the inner ends of the pair of lead conductors (2) by soldering.
[0020]
As shown in FIG. 4, a rosin-based flux (11) obtained by mixing an active agent with purified rosin is applied around the fuse element (3).
[0021]
On top of these, a cover (4) having an outer shape substantially the same as that of the insulating substrate (1) is covered. The inner surface of the lid (4) is in contact with the upper surface of the lead conductor (2) provided on the protrusion (9).
[0022]
The lid (4) is attached by applying a sealing agent such as epoxy resin to the outer periphery of the upper surface of the insulating substrate (1). In this case, a protrusion (7) extending along the length direction is formed on the long side (5) side of the insulating substrate (1), and a bank-shaped protrusion (9) is formed on the short side (6) side. ) And the engaging portion (10) is provided, the sealing agent applied to the outside by these members can prevent the intrusion into the fuse element (3) side.
[0023]
[Example 2]
FIG. 5 shows an example in which the bank-shaped protrusion (1) has a substantially trapezoidal shape, and the engaging portion (10) of the lead conductor (2) correspondingly has the same shape.
[0024]
[Example 3]
FIG. 7 shows an example in which the protrusion (9) has a semicircular cross section and the engaging portion (10) has a corresponding shape. The protrusion (9) and the engaging portion (10) may have other suitable shapes.
[0025]
In the second and third embodiments, other configurations, assembly, and the like are the same as those in the first embodiment described above, and thus the description thereof is omitted.
[0026]
【The invention's effect】
As described above, according to the first aspect of the present invention, each lead conductor (2) is positioned at a predetermined position while the engaging portion (10) is easily positioned on the protrusion (9) of the insulating substrate (1). It can be attached, the tensile strength of the lead conductor (2) is improved, and thus the reliability is improved and the assemblability is good.
[0027]
According to Claim 2, it can prevent that a sealing agent penetrate | invades through an inside via the protrusion (9) for positioning, and can reduce a defect rate.
[0028]
According to the third aspect, since the protrusion (9) and the engaging portion (10) have a simple shape, manufacturing is easy.
[Brief description of the drawings]
FIG. 1 shows an exploded perspective view of a first embodiment of the present invention.
2A is a plan view showing a state in which a pair of lead conductors are attached to an insulating substrate, and FIG. 2B is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is a side sectional view showing a state in which a fusible alloy is attached between a pair of lead conductors.
FIG. 4 is a plan view of an assembled state shown with a partial break.
FIG. 5 shows a second embodiment of the present invention.
FIG. 6 shows a third embodiment of the present invention.
FIG. 7 shows a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Insulating board 2 Lead conductor 3 Fuse element 4 Lid 5 Long side 6 Short side 7 Protrusion 8 Recess 9 Protrusion 10 Engagement part 11 Flux

Claims (3)

薄型絶縁体を構成し、下ケースとして機能する平面形状がほぼ長方形をなす絶縁基板(1)の上面両側に、その各長辺(5)に沿って延びる一対の突部(7)をそれぞれ形成し、これら突部(7)間に凹部(8)を形成するとともに、凹部(8)の両端に土手状の突部(9)をそれぞれ形成し、これら突部(9)は前記絶縁基板(1)の短辺(6)側に位置し、かつ前記凹部(8)に内端部分が収納される一対の帯状のリード導体(2)の内端部に前記突部(9)に対応した形状をなし、係合可能な位置決め用の係合部(10)をそれぞれ形成し、収納された一対のリード導体(2)の対向する内端間をヒューズエレメント(3)で接続するとともに、前記絶縁基板(1)の上部に上ケースとして機能する蓋(4)を封止剤を介して取付けてなることを特徴とする薄型温度ヒューズ。A pair of protrusions (7) extending along the respective long sides (5) are formed on both sides of the upper surface of the insulating substrate (1) which constitutes a thin insulator and functions as a lower case and has a substantially rectangular planar shape. The recesses (8) are formed between the protrusions (7), and bank-like protrusions (9) are formed at both ends of the recess (8). The protrusions (9) are formed on the insulating substrate (9). 1) is located on the short side (6) side and corresponds to the protrusion (9) at the inner end of a pair of strip-shaped lead conductors (2) in which the inner end is accommodated in the recess (8). The engaging portions (10) for positioning that can be engaged with each other are formed, and the opposing inner ends of a pair of stored lead conductors (2) are connected by a fuse element (3). A lid (4) functioning as an upper case is attached to the upper part of the insulating substrate (1) through a sealant. A flat-screen temperature fuse characterized by Rukoto. 請求項1記載において、封止剤は長辺(5)側に沿って延びる突部(7)および凹部(8)内において短辺(6)側に形成された突部(9)の外側に注入されることを特徴とする薄型温度ヒューズ。2. The sealant according to claim 1, wherein the sealant is disposed outside the protrusion (9) formed on the short side (6) side in the protrusion (7) extending along the long side (5) side and the recess (8). A thin thermal fuse that is injected. 請求項1記載において、土手状の突部(9)は断面ほぼ矩形、台形または半円形に形成され、リード導体(2)の係合部(10)はこれと対応した形状に形成されたことを特徴とする薄型温度ヒューズ。2. The bank-like protrusion (9) according to claim 1, wherein the bank-shaped protrusion (9) is formed in a substantially rectangular, trapezoidal or semicircular cross section, and the engaging portion (10) of the lead conductor (2) is formed in a shape corresponding thereto. Thin thermal fuse characterized by
JP2002286645A 2002-09-30 2002-09-30 Thin thermal fuse Expired - Fee Related JP4104412B2 (en)

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JP2002286645A JP4104412B2 (en) 2002-09-30 2002-09-30 Thin thermal fuse

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JP2004127570A JP2004127570A (en) 2004-04-22
JP4104412B2 true JP4104412B2 (en) 2008-06-18

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