JP3720618B2

JP3720618B2 - Transmission / reception unit

Info

Publication number: JP3720618B2
Application number: JP06632499A
Authority: JP
Inventors: 義雄斎藤; 育正西山
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 1999-03-12
Filing date: 1999-03-12
Publication date: 2005-11-30
Anticipated expiration: 2019-03-12
Also published as: JP2000261170A

Description

【０００１】
【発明の属する技術分野】
本発明は、携帯電話機に使用して好適な送受信ユニットに関する。
【０００２】
【従来の技術】
従来の送受信ユニットを図７に基づいて説明すると、金属板からなる筺体２１は、上下が開放された箱形をなし、四方に側壁２１ａを設けて収容部２１ｂが形成されると共に、下方に設けられた取付脚２１ｃを有する。
また、プリント基板からなる回路基板２２には、送受信回路を形成する発熱部品２３、金属カバー２４ａを有するデュプレクサ２４、及び種々の電気部品２５が配設され、そして、この回路基板２２は、筺体２１の収容部２１ｂ内に収容された状態で、側壁２１ａに取り付けられている。
【０００３】
また、一対のカバー２６、２７は、それぞれ金属板からなり、このカバー２６には、孔２６ａを有する切り曲げされた切り曲げ部２６ｂと、矩形状の孔２６ｃとを有する。
そして、カバー２６は、筺体２１の上方開放部を覆うように筺体２１に取り付けられ、矩形状の孔２６ｃからデュプレクサ２４の金属カバー２４ａを露出すると共に、切り曲げ部２６ｂを発熱部品２３の上面に圧接して、発熱部品２３の熱を切り曲げ部２６ｂを介してカバー２６から放熱すると共に、カバー２６で電気部品２５をシールドするようになっている。
また、カバー２７は、筺体２１の下方開放部を覆うように筺体２１に取り付けられ、回路基板２２の下面に配設した電気部品２５を電気的にシールドした状態となっている。
【０００４】
そして、このように構成された送受信ユニットは、筺体２１の取付脚２１ｃをマザー基板２８に挿入して、マザー基板２８に設けたアースパターン（図示せず）に取付脚２１ｃを半田付して、カバー２６、２７を筺体２１の側壁２１ａを介してアースパターンに接地するようになっている。
【０００５】
【発明が解決しようとする課題】
従来の送受信ユニットは、カバー２６の切り曲げ部２６ｂを、発熱部品２３に圧接させて放熱するようになっているため、切り曲げした際に孔２６ａが形成され、この孔２６ａにより、電気部品２５の電気的なシールドが悪くなるという問題がある。
【０００６】
【課題を解決するための手段】
上記課題を解決するための第１の解決手段として、発熱部品、デュプレクサ、及びその他の電気部品を取り付けた回路基板と、該回路基板を取り付けた筺体と、前記発熱部品と前記電気部品を覆うカバーとを備え、前記カバーに設けた孔から前記デュプレクサの金属カバーを外部に露出すると共に、前記カバー内には放熱板を配設し、該放熱板は前記発熱部品の表面に接触させた状態で、前記デュプレクサの前記金属カバーに接触させて、前記発熱部品の熱を前記放熱板を介して前記金属カバーから放熱するようにした構成とした。
また、第２の解決手段として、前記放熱板には舌片を設け、該舌片と前記金属カバーと前記カバーとを半田付した構成とした。
【０００７】
また、第３の解決手段として、前記放熱板には、前記カバーと前記電気部品との間に介在するように延設する内カバー部を設けた構成とした。
また、第４の解決手段として、前記カバーには、切り曲げ部、或いは突き出し部を設け、該切り曲げ部、或いは突き出し部で、前記内カバー部上を押圧して、前記放熱板を支持するようにした構成とした。
また、第５の解決手段として、前記放熱板には、下方に折り曲げた脚部を有し、前記回路基板に設けた導電パターンのアース部に前記脚部を圧接するようにした構成とした。
【０００８】
【発明の実施の形態】
本発明の送受信ユニットを図１〜図６に基づいて説明すると、何れも本発明の送受信ユニットを示し、図１は要部の平面図、図２はカバーとアース板を取り去った状態を示す要部の平面図、図３は要部の断面図、図４は図１の４−４線における断面図、図５は放熱板の斜視図、図６はアース板の斜視図である。
【０００９】
次に、本発明の送受信ユニットを図１〜図６に基づいて説明すると、合成樹脂の成型品からなる筺体１は、底壁１ａと、底壁１ａの四方に設けられ、上部が開放された側壁１ｂと、底壁１ａと側壁１ｂで形成された収容部１ｃとを有し、この筺体１の全表面には、金属メッキによって形成された導電層（図示せず）が設けられている。
【００１０】
また、プリント基板からなり、導電パターン２ａを有する回路基板２のには、送受信回路を構成するパワーアンプ等かなる発熱部品３、金属カバー４ａを有するデュプレクサ４と、その他の種々の電気部品５が配設されており、この回路基板２は、筺体１の上部の開放部を塞ぐように筺体１に取り付けられると共に、下面に設けた電気部品５が収容部１ｃに収容されて、電気的にシールドされた構成となっている。
【００１１】
また、金属板からなる放熱板６は、図５に示すように、僅かに下方に折り曲げされた当接部６ａを有する放熱部６ｂと、この放熱部６ｂから延設して形成された内カバー部６ｃと、放熱部６ａと内カバー部６ｃの側縁から上方に折り曲げられた複数個の舌片６ｄと、放熱部６ｂと内カバー６ｃの側縁の適宜箇所から下方に折り曲げられた複数個の脚部６ｅとを有する。
そして、この放熱板６は、デュプレクサ４に近接した状態で発熱部品３と電気部品５上に配置されると共に、放熱部６ｂの当接部６ａは発熱部品３の上部表面に接触し、また、舌片６ｄはデュプレクサ４の金属カバー４ａに接触し、且つ、脚部４ｅは回路基板２上の導電パターン２ａのアース部に当接した状態で配置される。
【００１２】
また、金属板からなるカバー７は、箱形をなし、上壁７ａと、上壁７ａの四方に形成された側壁７ｂと、上壁７ａに設けられた切り曲げ部７ｃと、上壁７ａに設けられた矩形状の孔７ｄと、この孔７ｄの縁部に設けられた凹部７ｅと、ここでは図示していないが上壁７ａに設けられた突き出し部とを有している。
そして、このカバー７は、回路基板２の上面に配設された電気部品５、及び放熱板６を含む送受信回路を覆うように、筺体１に取り付けられ、このカバー７で上部の送受信回路が電気的にシールドされた構成となっている。
【００１３】
そして、カバー７が筺体１に取り付けられた際、切り曲げ部７ｂと突き出し部は、発熱板６の上面を押圧して、脚部６ｅを導電パターン２ａのアース部に圧接すると共に、当接部６ａを発熱部品３の上面に圧接し、また、孔７ｄ内にはデュプレクサ４の金属カバー４ａが位置して、外部に露出した状態となり、更に、凹部７ｅは、放熱板６の舌片６ｄに近接した状態で配置された状態となる。
そして、この凹部７ｅの部分に半田付を行って、カバー７と舌片６ｅと金属カバー４ａとを半田付して、３者を電気的に接続する。
【００１４】
また、金属板からなるアース板８は、下片部が弾性舌片となったコ字状部８ａと、コ字状部８ａの上辺部に設けられた孔８ｂと、コ字状部８ａの上辺部からほぼ直角に折り曲げられた折り曲げ片８ｃとを有している。
そして、このアース板８は、コ字状部８ａで回路基板２と底壁１ａとを挟持して、側片部を側壁１ｂに沿って配置し、アース板８のコ字状部８ａの弾性舌片を筺体１の下面に導出すると共に、折り曲げ片８ｃをカバー７の側壁７ｂに接触させ、折り曲げ片８ｃと側壁７ｂとを半田付けすると共に、孔８ｂの位置で、アース板８と導電パター２ａのアース部を半田付して、アース板８が取り付けられている。
【００１５】
そして、このような送受信ユニットは、アース板８の弾性舌片がマザー基板９のアースパターン（図示せず）に弾接するようにして、筺体１がマザー基板９上に載置され、マザー基板９のアースパターンと弾性舌片を半田付して、筺体１がマザー基板９に取り付けられる。
このような構成において、放熱板６、金属カバー４ａ及びカバー７は、アース板８を介してマザー基板９のアースパターンに接地されると共に、回路基板２の導電パターン２ａのアース部も接地されるようになる。
更に、発熱部品３からの熱は、放熱板６を介してデュプレクサ４の金属カバー４ａ、及びカバー７に伝達されて、金属カバー４ａとカバー７から放熱されるようになる。
【００１６】
【発明の効果】
本発明の送受信ユニットは、カバー７に設けた孔７ｄからデュプレクサ４の金属カバー４ａを外部に露出すると共に、カバー７内には放熱板６を配設し、該放熱板６は発熱部品３の表面に接触させた状態で、デュプレクサ４の金属カバー４ａに接触させて、発熱部品３の熱を放熱板６を介して金属カバー４ａから放熱するようにしたため、従来のような切り曲げ部２６ｂの形成による孔２６ａが無く、従って、電気的なシールドが良好で、放熱効果のある送受信ユニットを提供できる。
また、放熱板６には舌片６ｄを設け、該舌片６ｄと金属カバー４ａとカバー７とを半田付したため、放熱板６からの熱を金属カバー４ａとカバー７に伝達できて、放熱効果が良好となるばかりか、放熱板６と金属カバー４ａとカバー７とが電気的に導通して、一層、シールド効果の良好な送受信ユニットを提供できる。
【００１７】
また、放熱板６には、カバー７と電気部品５との間に介在するように延設する内カバー部６ｃを設けたため、２重シールド構成となり、シールド効果の良好な送受信ユニットを提供できる。
また、カバー７には、切り曲げ部７ｃ、或いは突き出し部を設け、該切り曲げ部７ｃ、或いは突き出し部で、内カバー部６ｃ上を押圧して、放熱板６を支持するため、切り曲げ部７ｃの形成による孔が内カバー部６ｃで塞がれて、シールド効果が良好で、簡単な構成で、放熱板６の支持ができる送受信ユニットを提供できる。
また、放熱板６には、下方に折り曲げた脚部６ｅを有し、回路基板２に設けた導電パターン２ａのアース部に脚部６ｅを圧接するようにしたため、カバー７の取付と同時に、導電パターン２ａのアース部と放熱板６との接続が図れて、生産性の良好な送受信ユニットを提供できる。
【図面の簡単な説明】
【図１】本発明の送受信ユニットの要部の平面図。
【図２】本発明の送受信ユニットに係り、カバーとアース板を取り去った状態を示す要部の平面図。
【図３】本発明の送受信ユニットの要部の断面図。
【図４】図１の４−４線における断面図。
【図５】本発明の送受信ユニットに係る放熱板の斜視図。
【図６】本発明の送受信ユニットに係るアース板の斜視図。
【図７】従来の送受信ユニットの断面図。
【符号の説明】
１筺体
１ａ底壁
１ｂ側壁
１ｃ収容部
２回路基板
２ａ導電パターン
３発熱部品
４デュプレクサ
４ａ金属カバー
５電気部品
６放熱板
６ａ当接部
６ｂ放熱部
６ｃ内カバー部
６ｄ舌片
６ｅ脚部
７カバー
７ａ上壁
７ｂ側壁
７ｃ切り曲げ部
７ｄ孔
７ｅ凹部
８アース板
８ａコ字状部
８ｂ孔
８ｃ折り曲げ部
９マザー基板[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transmission / reception unit suitable for use in a mobile phone.
[0002]
[Prior art]
A conventional transmission / reception unit will be described with reference to FIG. 7. A casing 21 made of a metal plate has a box shape with the top and bottom open, and a side wall 21a is provided on all sides to form an accommodating portion 21b, and is provided below. Mounting leg 21c.
A circuit board 22 made of a printed circuit board is provided with a heat generating component 23 that forms a transmission / reception circuit, a duplexer 24 having a metal cover 24a, and various electrical components 25. The circuit board 22 includes a housing 21. It is attached to the side wall 21a in a state of being accommodated in the accommodating portion 21b.
[0003]
Each of the pair of covers 26 and 27 is made of a metal plate, and the cover 26 has a cut and bent portion 26b having a hole 26a and a rectangular hole 26c.
The cover 26 is attached to the housing 21 so as to cover the upper open portion of the housing 21, exposes the metal cover 24 a of the duplexer 24 from the rectangular hole 26 c, and cuts and bends 26 b on the upper surface of the heat generating component 23. The heat of the heat generating component 23 is cut and heat is released from the cover 26 via the bent portion 26b, and the electric component 25 is shielded by the cover 26.
Further, the cover 27 is attached to the housing 21 so as to cover the lower open portion of the housing 21, and is in a state of electrically shielding the electrical component 25 disposed on the lower surface of the circuit board 22.
[0004]
The transmission / reception unit configured in this manner inserts the mounting legs 21c of the housing 21 into the mother board 28, and solders the mounting legs 21c to an earth pattern (not shown) provided on the mother board 28. The covers 26 and 27 are grounded to the earth pattern via the side wall 21a of the housing 21.
[0005]
[Problems to be solved by the invention]
In the conventional transmission / reception unit, the cut and bent portion 26b of the cover 26 is brought into pressure contact with the heat generating component 23 to dissipate heat. Therefore, a hole 26a is formed when the cut and bent portion is cut, and the electric component 25 is formed by the hole 26a. There is a problem that the electrical shield of the device becomes worse.
[0006]
[Means for Solving the Problems]
As a first means for solving the above problems, a circuit board to which a heat generating component, a duplexer, and other electric components are attached, a housing to which the circuit board is attached, and a cover that covers the heat generating component and the electric component And exposing the duplexer metal cover to the outside through a hole provided in the cover, and disposing a heat sink in the cover, the heat sink being in contact with the surface of the heat-generating component. The heat is generated from the metal cover through the heat radiating plate in contact with the metal cover of the duplexer.
As a second solution, a tongue piece is provided on the heat radiating plate, and the tongue piece, the metal cover, and the cover are soldered.
[0007]
As a third solution, the heat radiating plate is provided with an inner cover portion extending so as to be interposed between the cover and the electrical component.
Further, as a fourth solving means, the cover is provided with a cut and bent portion or a protruding portion, and the cut and bent portion or the protruded portion presses the inner cover portion to support the heat radiating plate. The configuration was as follows.
As a fifth solution, the heat radiating plate has a leg portion bent downward, and the leg portion is in pressure contact with a ground portion of a conductive pattern provided on the circuit board.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The transmission / reception unit of the present invention will be described with reference to FIGS. 1 to 6. Each of the transmission / reception units of the present invention shows the transmission / reception unit of the present invention, FIG. 1 is a plan view of the main part, and FIG. 3 is a cross-sectional view of the main part, FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 1, FIG. 5 is a perspective view of the heat sink, and FIG. 6 is a perspective view of the ground plate.
[0009]
Next, the transmission / reception unit of the present invention will be described with reference to FIGS. 1 to 6. A casing 1 made of a synthetic resin molded product is provided on the bottom wall 1a and the four sides of the bottom wall 1a, and the upper part is opened. The housing 1 has a side wall 1b, a bottom wall 1a, and a side wall 1b. A conductive layer (not shown) formed by metal plating is provided on the entire surface of the housing 1.
[0010]
Further, a circuit board 2 made of a printed circuit board and having a conductive pattern 2a includes a heat generating component 3 such as a power amplifier constituting a transmission / reception circuit, a duplexer 4 having a metal cover 4a, and other various electric components 5. The circuit board 2 is attached to the housing 1 so as to close the open portion of the upper portion of the housing 1, and the electrical component 5 provided on the lower surface is housed in the housing portion 1c to be electrically shielded. It has been configured.
[0011]
Further, as shown in FIG. 5, the heat radiating plate 6 made of a metal plate includes a heat radiating portion 6b having a contact portion 6a bent slightly downward, and an inner cover extending from the heat radiating portion 6b. Part 6c, a plurality of tongue pieces 6d bent upward from the side edges of heat radiating part 6a and inner cover part 6c, and a plurality of pieces bent downward from appropriate locations on the side edges of heat radiating part 6b and inner cover 6c Leg 6e.
And this heat sink 6 is arrange | positioned on the heat-emitting component 3 and the electrical component 5 in the state close | similar to the duplexer 4, and the contact part 6a of the heat radiating part 6b contacts the upper surface of the heat-generating part 3, The tongue piece 6d is in contact with the metal cover 4a of the duplexer 4, and the leg portion 4e is disposed in contact with the ground portion of the conductive pattern 2a on the circuit board 2.
[0012]
The cover 7 made of a metal plate has a box shape, and includes an upper wall 7a, side walls 7b formed on four sides of the upper wall 7a, cut and bent portions 7c provided on the upper wall 7a, and an upper wall 7a. It has a rectangular hole 7d provided, a recess 7e provided at the edge of the hole 7d, and a protrusion provided on the upper wall 7a (not shown here).
The cover 7 is attached to the housing 1 so as to cover the transmission / reception circuit including the electrical component 5 and the heat sink 6 disposed on the upper surface of the circuit board 2, and the upper transmission / reception circuit is electrically connected to the cover 7. It is a shielded configuration.
[0013]
When the cover 7 is attached to the housing 1, the cut and bent portion 7 b and the protruding portion press the upper surface of the heat generating plate 6 to press the leg portion 6 e against the ground portion of the conductive pattern 2 a and the contact portion. 6a is pressed against the upper surface of the heat generating component 3, and the metal cover 4a of the duplexer 4 is located in the hole 7d so as to be exposed to the outside. Further, the recess 7e is formed on the tongue 6d of the heat radiating plate 6. It becomes the state arrange | positioned in the state which adjoined.
Then, the concave portion 7e is soldered, and the cover 7, the tongue piece 6e, and the metal cover 4a are soldered to electrically connect the three parties.
[0014]
The ground plate 8 made of a metal plate includes a U-shaped portion 8a having a lower tongue portion as an elastic tongue piece, a hole 8b provided in the upper side portion of the U-shaped portion 8a, and a U-shaped portion 8a. And a bent piece 8c bent substantially at a right angle from the upper side.
The ground plate 8 sandwiches the circuit board 2 and the bottom wall 1a with the U-shaped portion 8a, and the side piece portion is disposed along the side wall 1b. The elasticity of the U-shaped portion 8a of the ground plate 8 is as follows. The tongue piece is led out to the lower surface of the housing 1, the bent piece 8c is brought into contact with the side wall 7b of the cover 7, the bent piece 8c and the side wall 7b are soldered, and the ground plate 8 and the conductive pattern are located at the hole 8b. A ground plate 8 is attached by soldering the ground portion 2a.
[0015]
In such a transmission / reception unit, the housing 1 is placed on the mother board 9 so that the elastic tongue of the earth board 8 is in elastic contact with the earth pattern (not shown) of the mother board 9. The casing 1 is attached to the mother board 9 by soldering the earth pattern and the elastic tongue piece.
In such a configuration, the heat radiating plate 6, the metal cover 4a, and the cover 7 are grounded to the ground pattern of the mother substrate 9 via the ground plate 8, and the ground portion of the conductive pattern 2a of the circuit board 2 is also grounded. It becomes like this.
Further, heat from the heat generating component 3 is transmitted to the metal cover 4 a and the cover 7 of the duplexer 4 through the heat radiating plate 6, and is radiated from the metal cover 4 a and the cover 7.
[0016]
【The invention's effect】
The transmission / reception unit of the present invention exposes the metal cover 4 a of the duplexer 4 to the outside through a hole 7 d provided in the cover 7, and a heat radiating plate 6 is disposed in the cover 7. Since the heat of the heat generating component 3 is radiated from the metal cover 4a through the heat radiating plate 6 in contact with the metal cover 4a of the duplexer 4 while being in contact with the surface, There is no hole 26a due to formation, and therefore, an electrical shield is good and a transmission / reception unit having a heat dissipation effect can be provided.
Further, since the tongue 6d is provided on the heat radiating plate 6 and the tongue 6d, the metal cover 4a and the cover 7 are soldered, heat from the heat radiating plate 6 can be transmitted to the metal cover 4a and the cover 7. In addition, the heat radiating plate 6, the metal cover 4a, and the cover 7 are electrically connected to each other, so that a transmission / reception unit having a better shielding effect can be provided.
[0017]
Further, since the heat sink 6 is provided with the inner cover portion 6c extending so as to be interposed between the cover 7 and the electric component 5, a double shield configuration is provided, and a transmission / reception unit having a good shielding effect can be provided.
Further, the cover 7 is provided with a cut and bent portion 7c or a protruding portion, and the cut and bent portion 7c or the protruded portion presses the inner cover portion 6c to support the heat radiating plate 6. The transmission / reception unit capable of supporting the heat radiating plate 6 with a simple configuration can be provided with a simple shielding effect by blocking the hole due to the formation of 7c with the inner cover portion 6c.
Further, the heat radiation plate 6 has a leg portion 6e bent downward, and the leg portion 6e is pressed against the ground portion of the conductive pattern 2a provided on the circuit board 2. A connection between the ground portion of the pattern 2a and the heat radiating plate 6 can be achieved, and a transmission / reception unit with good productivity can be provided.
[Brief description of the drawings]
FIG. 1 is a plan view of a main part of a transmission / reception unit according to the present invention.
FIG. 2 is a plan view of a main part showing a state where a cover and a ground plate are removed according to the transmission / reception unit of the present invention.
FIG. 3 is a cross-sectional view of a main part of a transmission / reception unit according to the present invention.
4 is a cross-sectional view taken along line 4-4 of FIG.
FIG. 5 is a perspective view of a heat sink according to the transmission / reception unit of the present invention.
FIG. 6 is a perspective view of a ground plate according to the transmission / reception unit of the present invention.
FIG. 7 is a cross-sectional view of a conventional transmission / reception unit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing 1a Bottom wall 1b Side wall 1c Housing part 2 Circuit board 2a Conductive pattern 3 Heating component 4 Duplexer 4a Metal cover 5 Electrical component 6 Heat sink 6a Contact part 6b Heat sink part 6c Inner cover part 6d Tongue piece 6e Leg part 7 Cover 7a Upper wall 7b Side wall 7c Cut and bend 7d Hole 7e Recess 8 Ground plate 8a U-shaped portion 8b Hole 8c Bend 9 Mother board

Claims

A circuit board to which a heat generating component, a duplexer, and other electrical components are attached; a housing to which the circuit board is attached; a cover that covers the heat generating component and the electrical component; and a hole of the duplexer that is provided in the cover. The metal cover is exposed to the outside, and a heat radiating plate is disposed in the cover, and the heat radiating plate is in contact with the metal cover of the duplexer while being in contact with the surface of the heat generating component. A transmission / reception unit characterized in that heat of a component is radiated from the metal cover through the heat radiating plate.

The transmission / reception unit according to claim 1, wherein a tongue piece is provided on the heat radiating plate, and the tongue piece, the metal cover, and the cover are soldered.

The transmission / reception unit according to claim 1, wherein the heat radiating plate is provided with an inner cover portion extending so as to be interposed between the cover and the electric component.

The cover is provided with a cut and bent portion or a protruding portion, and the cut and bent portion or the protruded portion presses the inner cover portion to support the heat radiating plate. Item 6. The transmission / reception unit according to item 3.

5. The transmission / reception unit according to claim 4, wherein the heat radiating plate has legs bent downward, and the legs are pressed against a ground part of a conductive pattern provided on the circuit board.