JPH0645780A - Electromagnetic shielding earth spring - Google Patents

Electromagnetic shielding earth spring

Info

Publication number
JPH0645780A
JPH0645780A JP19437192A JP19437192A JPH0645780A JP H0645780 A JPH0645780 A JP H0645780A JP 19437192 A JP19437192 A JP 19437192A JP 19437192 A JP19437192 A JP 19437192A JP H0645780 A JPH0645780 A JP H0645780A
Authority
JP
Japan
Prior art keywords
contact
spring
housing
earth spring
electromagnetic wave
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.)
Withdrawn
Application number
JP19437192A
Other languages
Japanese (ja)
Inventor
Tomio Horikoshi
富夫 堀越
Kenji Shiozawa
健治 塩澤
Takashi Horikoshi
隆 堀越
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Gunma Ltd
Original Assignee
NEC Gunma Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Gunma Ltd filed Critical NEC Gunma Ltd
Priority to JP19437192A priority Critical patent/JPH0645780A/en
Publication of JPH0645780A publication Critical patent/JPH0645780A/en
Withdrawn legal-status Critical Current

Links

Landscapes

  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

PURPOSE:To keep the contact surface of an earth spring stable in contact resistance so as to enable it to be possessed of a stable shielding effect by a method wherein the end face of the spring is set vertical to its lengthwise axis and brought into contact with the underside of an upper case. CONSTITUTION:The corner of the end face of an earth spring 1 is brought into contact with the underside of an upper case 3, and the rear end of the spring 1 is fixed to the upside of a lower case 2 by caulking, screwing or welding. By this constitution, the earth spring 1 and the case 3 are made to come into partial contact with each other, so that a load concentrates on a contact part to lessen it in contact resistance to improve an earth spring in electromagnetic shielding effect. Moreover, a contact part is high enough in contact pressure, so that it can be kept stable in contact resistance even if it decreases in contact pressure due to the deterioration of an earth spring in spring force. Moreover, if inactive lubricant or conductive adhesive agent is applied to a contact part, the earth spring can be increased in shielding effect.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、電子装置の筺体に結合
し、電子装置が発生する電磁波をシールドするための電
磁波シールド用アーススプリングに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shielding earth spring which is coupled to a housing of an electronic device and shields an electromagnetic wave generated by the electronic device.

【０００２】[0002]

【従来の技術】図４は、従来の電磁波シールド用アース
スプリングの一例を示す断面図である。2. Description of the Related Art FIG. 4 is a sectional view showing an example of a conventional earth spring for electromagnetic wave shielding.

【０００３】図４に示すように、電子装置の筺体に結合
して電子装置が発生する電磁波をシールドするための従
来の電磁波シールド用のアーススプリング３１は、その
後端部を下側の筺体３２の上面にかしめまたはねじ止め
または溶接等の結合手段によって固定してアーススプリ
ング３１と筺体３２とを電気的に導通させ、先端部に上
方に突出させた円弧状の突出部３１ａを形成し、この突
出部３１ａの上面を上側の筺体３３の下面に接触させ、
突出部３１ａと筺体３３との接触圧力を所定の値に保つ
ことによってアーススプリング３１と筺体３２とを電気
的に導通させることにより、電子装置が発生する電磁波
をシールドしている。このときのアーススプリング３１
と筺体３２との接触抵抗値は、数１０ｍΩ〜数１００ｍ
Ωである。As shown in FIG. 4, a conventional electromagnetic wave shield earth spring 31 for shielding electromagnetic waves generated by an electronic device by being coupled to the housing of the electronic device has a rear end portion of a lower housing 32. The earth spring 31 and the housing 32 are electrically connected to each other by being fixed to the upper surface by a coupling means such as caulking, screwing, or welding, and an arc-shaped protruding portion 31a protruding upward is formed at the tip end. The upper surface of the portion 31a is brought into contact with the lower surface of the upper housing 33,
Electromagnetic waves generated by the electronic device are shielded by electrically connecting the earth spring 31 and the housing 32 by maintaining the contact pressure between the protruding portion 31a and the housing 33 at a predetermined value. Earth spring 31 at this time
The contact resistance value between the housing and the housing 32 is several 10 mΩ to several 100 m.
Ω.

【０００４】[0004]

【発明が解決しようとする課題】上述したような従来の
電磁波シールド用アーススプリングは、外圧や、経年変
化や、繰返えし撓みに起因するアーススプリングの疲労
による接触圧力の低下や、接触面における酸化皮膜の形
成や、接触面における異物の介在等によって接触抵抗値
が大きくなり、その結果としてアーススプリングによる
電磁波のシールド効果が低下するという欠点を有してい
る。The conventional earth springs for electromagnetic wave shielding as described above have a decrease in contact pressure due to fatigue of the earth spring caused by external pressure, aging, and repeated bending, and contact surfaces. The contact resistance value increases due to the formation of an oxide film and the inclusion of foreign matter on the contact surface, resulting in a decrease in the electromagnetic wave shielding effect of the earth spring.

【０００５】[0005]

【課題を解決するための手段】本発明の電磁波シールド
用アーススプリングは、先端部をほゞ直角に形成して端
面のエッジを上側の筺体の下面に接触させるか、または
先端部に上方に三角形に突出させた突出部を形成してそ
の突出部の三角形の頂点の部分を上側の筺体の下面に接
触させるか、また先端部には上方に突出させた突出部を
バーリング加工によって形成してその突出部の先端部分
を上側の筺体の下面に接触させ、後端部を下側の筺体の
上面に結合したことを含むものであり、さらに、アース
スプリングと上側の筺体との接触部に不活性潤滑剤を塗
布したものである。In the earth spring for electromagnetic wave shield of the present invention, the tip portion is formed at a substantially right angle so that the edge of the end surface is brought into contact with the lower surface of the upper housing, or the tip portion has a triangular shape upward. A protruding portion is formed on the upper housing by contacting the triangular vertex of the protruding portion with the lower surface of the upper housing, or by forming a protruding portion on the tip end by burring. This includes connecting the tip of the protruding part to the lower surface of the upper housing and connecting the rear end to the upper surface of the lower housing.In addition, it is inert to the contact portion between the earth spring and the upper housing. A lubricant is applied.

【０００６】本発明の他の電磁波シールド用アーススプ
リングは、円弧状に形成して上方に突出させた突出部を
先端部に形成し、前記突出部の上面を上側の筺体の下面
に接触させ、後端部を下側の筺体の上面に結合し、前記
突出部の上面と前記上側の筺体の下面との間に不活性潤
滑剤または導電性接着剤を塗布したものである。In another electromagnetic wave shielding earth spring of the present invention, a projecting portion formed in an arc shape and projecting upward is formed at the tip portion, and the upper surface of the projecting portion is brought into contact with the lower surface of the upper housing, The rear end portion is joined to the upper surface of the lower housing, and an inert lubricant or a conductive adhesive is applied between the upper surface of the protrusion and the lower surface of the upper housing.

【０００７】[0007]

【実施例】次に、本発明の実施例について図面を参照し
て説明する。Embodiments of the present invention will now be described with reference to the drawings.

【０００８】図１は本発明の第一の実施例を示す断面
図、図５は電磁波シールド用アーススプリングの筺体に
対する接触圧力と接触抵抗値との関係を示す特性図であ
る。FIG. 1 is a sectional view showing a first embodiment of the present invention, and FIG. 5 is a characteristic diagram showing the relationship between the contact pressure and the contact resistance value of the electromagnetic spring grounding spring with respect to the housing.

【０００９】図１の実施例のアーススプリング１は、ほ
ゞ直角に形成した先端部の端面のエッジを上側の筺体３
の下面に接触させ、後端部を下側の筺体２の上面にかし
めまたはねじ止めまたは溶接等の結合手段によって固定
している。In the earth spring 1 of the embodiment shown in FIG. 1, the edge of the end face of the tip portion formed at a substantially right angle has an upper casing 3
And the rear end is fixed to the upper surface of the lower housing 2 by caulking, screwing or welding.

【００１０】このように構成することにより、アースス
プリング１と筺体３とは局部的に接触することとなるた
め、従来例のように、同一のばね定数のアーススプリン
グが同一の撓み量で面接触する場合に場合に比して、接
触部分における荷重が集中するため、接触部分の接触抵
抗が低下し、電磁波のシールド効果が向上する。また、
接触部分において荷重が集中して充分な接触圧力が得ら
れるため、アーススプリングのへたりによる接触圧力の
低下に対しても、安定した接触抵抗を保つことができる
ため、安定したシールド効果が得られる。With this structure, the earth spring 1 and the housing 3 are locally in contact with each other. Therefore, as in the conventional example, the earth springs having the same spring constant are in surface contact with the same amount of deflection. Compared with the case, the load is concentrated at the contact portion, so that the contact resistance at the contact portion is reduced and the electromagnetic wave shielding effect is improved. Also,
Since the load is concentrated at the contact area and sufficient contact pressure is obtained, stable contact resistance can be maintained even if the contact pressure decreases due to the fatigue of the earth spring, so a stable shield effect can be obtained. .

【００１１】アーススプリング１と筺体３との接触状態
と接触抵抗値との関係は、図５に示すように、同一接触
圧力（ばね定数×撓み量）に対して、局部接触のときの
抵抗値曲線５１は、面接触のときの抵抗値曲線５２より
も低い値を示す。従って局部接触のときの抵抗値の安定
領域５４は、面接触のときの抵抗値の安定領域５５より
も広くなる。As shown in FIG. 5, the relationship between the contact state between the earth spring 1 and the housing 3 and the contact resistance value is as follows. The resistance value at the time of local contact for the same contact pressure (spring constant × deflection amount). The curve 51 shows a lower value than the resistance value curve 52 at the time of surface contact. Therefore, the stable area 54 of the resistance value at the time of local contact is wider than the stable area 55 of the resistance value at the time of surface contact.

【００１２】上述の実施例において、アーススプリング
１と筺体３との間に不活性潤滑剤を塗布することによ
り、接触部分における酸化皮膜の形成を防止し、温度変
化や、湿度変化や、異物の介在や、経年変化に対しても
接触抵抗値を安定に保つことができるため、シールド効
果を安定に保つことが可能となる。In the above-mentioned embodiment, by applying an inert lubricant between the earth spring 1 and the housing 3, formation of an oxide film at the contact portion is prevented, and temperature change, humidity change, and foreign matter removal. Since the contact resistance value can be kept stable even with intervention and aging, the shield effect can be kept stable.

【００１３】図２は本発明の第二の実施例を示す断面図
である。FIG. 2 is a sectional view showing a second embodiment of the present invention.

【００１４】図２の実施例のアーススプリング１１は、
上方に三角形に突出させた突出部１１ａを先端部に形成
し、この突出部１１ａの三角形の頂点の部分を上側の筺
体１３の下面に接触させ、後端部を下側の筺体１２の上
面に結合したものである。The earth spring 11 of the embodiment shown in FIG.
A projecting portion 11a projecting upward in a triangular shape is formed at the tip portion, the apex portion of the triangle of the projecting portion 11a is brought into contact with the lower surface of the upper housing 13, and the rear end portion is placed on the upper surface of the lower housing 12. It is a combination.

【００１５】本実施例の作用および効果は、図１の実施
例の作用および効果と同じである。また、アーススプリ
ング１１と筺体１３との間に不活性潤滑剤を塗布するこ
とによる作用および効果も図１の実施例と同じである。The operation and effect of this embodiment are the same as the operation and effect of the embodiment of FIG. Further, the action and effect of applying the inert lubricant between the earth spring 11 and the housing 13 are the same as those in the embodiment of FIG.

【００１６】図３は本発明の第三の実施例を示す断面図
である。FIG. 3 is a sectional view showing a third embodiment of the present invention.

【００１７】図３の実施例のアーススプリング２１は、
バーリング加工によって上方に突出させた突出部２１ａ
を先端部に形成し、この突出部２１を上側の筺体２３の
下面に接触させ、後端部を下側の筺体１２の上面に結合
したものである。The earth spring 21 of the embodiment shown in FIG.
Projecting portion 21a that is projected upward by burring
Is formed at the front end portion, the protruding portion 21 is brought into contact with the lower surface of the upper housing 23, and the rear end portion is joined to the upper surface of the lower housing 12.

【００１８】本実施例の作用および効果は、図１の実施
例の作用および効果と同じである。また、アーススプリ
ング２１と筺体２３との間に不活性潤滑剤を塗布するこ
とによる作用および効果も図１の実施例と同じである。The operation and effect of this embodiment are the same as the operation and effect of the embodiment of FIG. The action and effect of applying the inert lubricant between the earth spring 21 and the housing 23 are also the same as those of the embodiment shown in FIG.

【００１９】なお、図４に示した従来のアーススプリン
グ３１において、アーススプリング３１と上側の筺体３
３との接触部分に不活性潤滑剤を塗布することによって
も、従来よりも接触抵抗値を安定に保つことができるた
め、シールド効果を安定に保つことが可能となる。In the conventional earth spring 31 shown in FIG. 4, the earth spring 31 and the upper housing 3 are
Even if the inert lubricant is applied to the contact portion with 3, the contact resistance value can be kept more stable than in the conventional case, so that the shield effect can be kept stable.

【００２０】更に、図４に示した従来のアーススプリン
グ３１において、アーススプリング３１と上側の筺体３
３との接触部分に導電性の接着剤を塗布して接触力を強
くすることによっても、接触抵抗値を安定に保つことが
できるため、シールド効果を安定に保つことが可能とな
る。この場合、外乱によってアーススプリングまたは上
側の筺体が振動しても、それらの接触点が固定されてい
るため、き回転磨耗が発生せず、磨耗による障害も防止
することができる。Further, in the conventional earth spring 31 shown in FIG. 4, the earth spring 31 and the upper housing 3 are
Since the contact resistance value can be kept stable even by applying a conductive adhesive to the contact portion with 3 to increase the contact force, the shield effect can be kept stable. In this case, even if the earth spring or the upper housing vibrates due to disturbance, the contact points thereof are fixed, so that no rotational wear occurs and a failure due to wear can be prevented.

【００２１】上述の各実施例において、アーススプリン
グと上側の筺体との接触部分に不活性潤滑剤または導電
性の接着剤を塗布することにより、接触部分が外部に対
して密閉されるため、酸化皮膜の形成および異物の混入
が防止され、これによってもシールド効果の安定性が向
上する。In each of the above-mentioned embodiments, by applying an inert lubricant or a conductive adhesive to the contact portion between the earth spring and the upper housing, the contact portion is sealed to the outside, so that the oxidation is prevented. The formation of a film and the inclusion of foreign matter are prevented, which also improves the stability of the shield effect.

【００２２】[0022]

【発明の効果】以上説明したように、本発明の電磁波シ
ールド用アーススプリングは、先端部をほゞ直角に形成
して端面のエッジを上側の筺体の下面に接触させるか、
または先端部に上方に三角形に突出させた突出部を形成
してその突出部の三角形の頂点の部分を上側の筺体の下
面に接触させるか、また先端部には上方に突出させた突
出部をバーリング加工によって形成してその突出部の先
端部分を上側の筺体の下面に接触させ、後端部を下側の
筺体の上面に結合することにより、接触部の接触抵抗を
安定に保つことができるため、安定したシールド効果が
得られるという効果がある。更に接触部に不活性潤滑剤
または導電性の接着剤を塗布することにより、一層安定
したシールド効果が得られるという効果もある。As described above, in the earth spring for electromagnetic wave shielding of the present invention, the tip portion is formed at a substantially right angle so that the edge of the end face is brought into contact with the lower surface of the upper casing, or
Alternatively, a triangular protrusion may be formed at the tip end so that the apex of the triangle of the protrusion is brought into contact with the lower surface of the upper housing, or the tip end is provided with an upward protrusion. The contact resistance of the contact portion can be stably maintained by forming it by burring so that the tip of the protrusion contacts the lower surface of the upper housing and the rear end is joined to the upper surface of the lower housing. Therefore, there is an effect that a stable shield effect can be obtained. Further, by applying an inert lubricant or a conductive adhesive to the contact portion, there is an effect that a more stable shield effect can be obtained.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の第一の実施例を示す断面図である。FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.

【図２】本発明の第二の実施例を示す断面図である。FIG. 2 is a sectional view showing a second embodiment of the present invention.

【図３】本発明の第三の実施例を示す断面図である。FIG. 3 is a sectional view showing a third embodiment of the present invention.

【図４】従来の電磁波シールド用アーススプリングの一
例を示す断面図である。FIG. 4 is a sectional view showing an example of a conventional earth spring for electromagnetic wave shielding.

【図５】電磁波シールド用アーススプリングの筺体に対
する接触圧力と接触抵抗値との関係を示す特性図であ
る。FIG. 5 is a characteristic diagram showing a relationship between a contact pressure and a contact resistance value with respect to a housing of an electromagnetic wave shield earth spring.

【符号の説明】[Explanation of symbols]

１・１１・２１・３１ アーススプリング ２・３・１２・１３・２２・２３・３２・３３ 筺体 １１ａ・２１ａ・３１ａ 突出部 ５１ 局部接触のときの抵抗値曲線 ５２ 面接触のときの抵抗値曲線 ５４ 局部接触のときの抵抗値の安定領域 ５５ 面接触のときの抵抗値の安定領域 1 ・ 11 ・ 21 ・ 31 Earth Spring 2 ・ 3 ・ 12 ・ 13 ・ 22 ・ 23 ・ 32 ・ 33 Enclosure 11a ・ 21a ・ 31a Projection 51 Resistance curve for local contact 52 Resistance curve for surface contact 54 Stable area of resistance value for local contact 55 Stable area of resistance value for surface contact

Claims (8)

【特許請求の範囲】[Claims] 【請求項１】 ほゞ直角に形成した先端部の端面のエッ
ジを上側の筺体の下面に接触させ、後端部を下側の筺体
の上面に結合したことを含むことを特徴とする電磁波シ
ールド用アーススプリング。1. An electromagnetic wave shield characterized by including an edge of an end surface of a front end portion formed at a substantially right angle, contacting a lower surface of an upper housing, and a rear end portion thereof being coupled to an upper surface of a lower housing. For earth spring. 【請求項２】 先端部の端面のエッジと上側の筺体の下
面との間に不活性潤滑剤を塗布したことを特徴とする請
求項１記載の電磁波シールド用アーススプリング。2. The electromagnetic wave shield earth spring according to claim 1, wherein an inert lubricant is applied between the edge of the end face of the tip portion and the lower face of the upper casing. 【請求項３】 上方に三角形に突出させた突出部を先端
部に形成し、前記突出部の三角形の頂点の部分を上側の
筺体の下面に接触させ、後端部を下側の筺体の上面に結
合したことを含むことを特徴とする電磁波シールド用ア
ーススプリング。3. A projecting portion that projects upward in a triangular shape is formed at a tip portion, a vertex portion of the triangle of the projecting portion is brought into contact with a lower surface of an upper housing, and a rear end portion thereof is an upper surface of a lower housing. An earth spring for electromagnetic wave shielding, which is characterized in that it is coupled to. 【請求項４】 突出部の三角形の頂点と上側の筺体の下
面との間に不活性潤滑剤を塗布したことを特徴とする請
求項３記載の電磁波シールド用アーススプリング。4. The earth spring for an electromagnetic wave shield according to claim 3, wherein an inert lubricant is applied between the apex of the triangle of the protrusion and the lower surface of the upper housing. 【請求項５】 バーリング加工によって上方に突出させ
た突出部を先端部に形成し、前記突出部の先端部分を上
側の筺体の下面に接触させ、後端部を下側の筺体の上面
に結合したことを含むことを特徴とする電磁波シールド
用アーススプリング。5. A protruding portion that is protruded upward by burring is formed on the tip portion, the tip portion of the protruding portion is brought into contact with the lower surface of the upper housing, and the rear end portion is joined to the upper surface of the lower housing. A ground spring for electromagnetic wave shielding, which includes the above. 【請求項６】 突出部の先端部分と上側の筺体の下面と
の間に不活性潤滑剤を塗布したことを特徴とする請求項
５記載の電磁波シールド用アーススプリング。6. The earth spring for an electromagnetic wave shield according to claim 5, wherein an inert lubricant is applied between the tip portion of the protrusion and the lower surface of the upper housing. 【請求項７】 円弧状に形成して上方に突出させた突出
部を先端部に形成し、前記突出部の上面を上側の筺体の
下面に接触させ、後端部を下側の筺体の上面に結合し、
前記突出部の上面と前記上側の筺体の下面との間に不活
性潤滑剤を塗布したことを特徴とする電磁波シールド用
アーススプリング。7. A projecting portion formed in an arc shape and projecting upward is formed at a tip portion, an upper surface of the projecting portion is brought into contact with a lower surface of an upper housing, and a rear end portion thereof is an upper surface of a lower housing. Combined with
An earth spring for electromagnetic wave shielding, characterized in that an inert lubricant is applied between the upper surface of the projecting portion and the lower surface of the upper housing. 【請求項８】 円弧状に形成して上方に突出させた突出
部を先端部に形成し、前記突出部の上面を上側の筺体の
下面に接触させ、後端部を下側の筺体の上面に結合し、
前記突出部の上面と前記上側の筺体の下面との間に導電
性接着剤を塗布したことを特徴とする電磁波シールド用
アーススプリング。8. A projecting portion formed in an arc shape and projecting upward is formed at a tip portion, an upper surface of the projecting portion is brought into contact with a lower surface of an upper housing, and a rear end portion thereof is an upper surface of a lower housing. Combined with
A grounding spring for electromagnetic wave shielding, characterized in that a conductive adhesive is applied between the upper surface of the projecting portion and the lower surface of the upper housing.
JP19437192A 1992-07-22 1992-07-22 Electromagnetic shielding earth spring Withdrawn JPH0645780A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19437192A JPH0645780A (en) 1992-07-22 1992-07-22 Electromagnetic shielding earth spring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19437192A JPH0645780A (en) 1992-07-22 1992-07-22 Electromagnetic shielding earth spring

Publications (1)

Publication Number Publication Date
JPH0645780A true JPH0645780A (en) 1994-02-18

Family

ID=16323483

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19437192A Withdrawn JPH0645780A (en) 1992-07-22 1992-07-22 Electromagnetic shielding earth spring

Country Status (1)

Country Link
JP (1) JPH0645780A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1022672A (en) * 1996-07-08 1998-01-23 Iwaki Electron Corp Ltd High frequency module
CN104093296A (en) * 2014-05-29 2014-10-08 苏州锟恩电子科技有限公司 RF shielding structure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1022672A (en) * 1996-07-08 1998-01-23 Iwaki Electron Corp Ltd High frequency module
JP2908326B2 (en) * 1996-07-08 1999-06-21 いわき電子株式会社 High frequency module
CN104093296A (en) * 2014-05-29 2014-10-08 苏州锟恩电子科技有限公司 RF shielding structure

Similar Documents

Publication Publication Date Title
US4511821A (en) Support structure for piezoelectric vibrator
US5808397A (en) Piezoelectric resonance device
JPH0645780A (en) Electromagnetic shielding earth spring
EP1214870B1 (en) Double sided gasket
JP3675719B2 (en) Low impedance mounting method and mounting structure for electronic device internal mounting board
JP3331362B2 (en) Electromagnetic relay
JP3336921B2 (en) Piezoelectric resonance components
JP3416805B2 (en) Quartz resonator disk holder
JPH09147950A (en) Receptacle contact
JP2000106493A (en) Electronic equipment
JP2003316282A (en) Liquid crystal display
JP4365982B2 (en) Tilt sensor
CN216749674U (en) Keyboard structure, portable mobile terminal and connecting structure
JPH09283191A (en) Frame ground(fg) connecting structure
JP3201777B2 (en) Crystal oscillator
JP2530938Y2 (en) Mounting structure of ceramic resonator
JPH11168349A (en) Electronic component and piezoelectric vibrator
JPH049743Y2 (en)
JP2003133886A (en) Crystal oscillator
JPH07186579A (en) Ic card
JP2848361B2 (en) Shield structure and shield method
JP2890575B2 (en) Electrical equipment terminals
JP3201794B2 (en) Crystal oscillator
JP2515738B2 (en) Display device using cathode ray tube
JPH053061A (en) Connector with emi countermeasure

Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 19991005