JPH0335672B2 - - Google Patents
Info
- Publication number
- JPH0335672B2 JPH0335672B2 JP59165499A JP16549984A JPH0335672B2 JP H0335672 B2 JPH0335672 B2 JP H0335672B2 JP 59165499 A JP59165499 A JP 59165499A JP 16549984 A JP16549984 A JP 16549984A JP H0335672 B2 JPH0335672 B2 JP H0335672B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit board
- printed circuit
- display device
- crt
- crt display
- 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.)
- Expired - Lifetime
Links
- 230000017525 heat dissipation Effects 0.000 claims description 4
- 230000005855 radiation Effects 0.000 description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
Landscapes
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はCRT表示装置に係り、特に装置から
の放射雑音を低減するための装置の構造改良に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a CRT display device, and particularly to a structural improvement of the device for reducing radiation noise from the device.
最近、CRT表示装置が電子計算機の端末装置、
またはパーソナルコンピユータの表示部として多
く利用されているが、このCRT表示装置から外
部に漏洩する放射雑音が問題になつており、この
改善が迫られている。特にパーソナルコンピユー
タの本体よりビデオ信号が出力され、このビデオ
信号をCRTの頚部に接続されているビデオ信号
増幅回路で増幅し、CRTに入力するわけである
が、このビデオ信号増幅回路を組み込んだプリン
ト基板以外の、例えばCRTの電源回路等を組み
込んだメインプリント基板より、筺体の外部へ漏
洩して空気中を伝わつて伝播する放射雑音が発生
し、この筺体の外部に漏洩した放射雑音がパーソ
ナルコンピユータ本体の誤動作を招く等の問題点
がある。特に周波数が30〜100MHzの領域での放
射雑音レベルが大きく、この放射雑音を抑えるこ
とが要望されている。
Recently, CRT display devices have been used as computer terminal devices,
CRT display devices are also often used as display units for personal computers, but the radiation noise leaking outside from these CRT display devices has become a problem, and improvements to this problem are urgently needed. In particular, a video signal is output from the main body of a personal computer, and this video signal is amplified by a video signal amplification circuit connected to the neck of the CRT and input to the CRT. Radiation noise that leaks out of the housing and propagates through the air is generated from a main printed circuit board that incorporates a CRT power supply circuit, etc. other than the board, and this radiation noise that leaks outside the housing can cause damage to the personal computer. There are problems such as the malfunction of the main unit. In particular, the radiation noise level is high in the frequency range of 30 to 100 MHz, and it is desired to suppress this radiation noise.
従来、このような放射雑音を抑えるためには、
CRTを設置する筺体の内部に導電性塗料の塗膜
を被着し、この塗膜と前記CRTの電源回路を組
み込んだメインプリント基板のアースとを接続し
てプラスチツク製の筺体の外部に放射雑音が漏洩
しない方法をとつていた。 Conventionally, in order to suppress such radiation noise,
A film of conductive paint is applied to the inside of the casing in which the CRT is installed, and this film is connected to the ground of the main printed circuit board that incorporates the power circuit of the CRT, thereby emitting radiated noise to the outside of the plastic casing. took measures to prevent leakage.
然し、上記した従来のようなCRT表示装置の
構造では、前記放射雑音を規定の範囲内に抑える
にはいま一つ不充分であるといつた問題点を生じ
る。
However, the structure of the conventional CRT display device described above has a problem in that it is still insufficient to suppress the radiation noise within a specified range.
また上記CRTを設置する筺体は、筺体内部の
温度がCRTの動作時に上昇するので、一般に筺
体の底部にスリツト状の孔を開口し、このスリツ
ト状の孔より外部に熱を放射させるようにしてい
るが、この孔がスロツトアンテナのような働きを
して、外部に放射雑音を放出するといつた問題点
を生じる。 In addition, since the temperature inside the case in which the CRT is installed rises when the CRT is in operation, a slit-like hole is generally opened at the bottom of the case, and the heat is radiated to the outside through this slit-like hole. However, this hole acts like a slot antenna, causing problems such as emitting radiation noise to the outside.
上記問題点は、筺体の底部に外部に通ずる複数
の熱放散用孔を設け、かつ該熱放散用孔を有する
筺体底部の上方にCRT本体に接続されたプリン
ト基板を設置したCRT表示装置において、プリ
ント基板と筺体底部との間に該プリント基板より
所定の間隔を隔てて複数の貫通孔を有する板状の
導電性部材を配設し、該導電性部材とプリント基
板のアースパターンとを電気的に接続したことを
特徴とするCRT表示装置により解決される。
The above problem is solved in a CRT display device in which a plurality of heat dissipation holes leading to the outside are provided at the bottom of the casing, and a printed circuit board connected to the CRT main body is installed above the bottom of the casing having the heat dissipation holes. A plate-shaped conductive member having a plurality of through holes is arranged between the printed circuit board and the bottom of the housing at a predetermined distance from the printed circuit board, and the conductive member and the ground pattern of the printed circuit board are electrically connected. The problem is solved by a CRT display device that is characterized by being connected to the .
即ち、CRTの電源回路等を組み込んだプリン
ト基板に対向して、複数の貫通孔を設けたシート
状の導電性部材を配設し、この導電性部材とプリ
ント基板のアースパターンとを電気的に接続する
ことで、この導電性部材の貫通孔を介してCRT
装置内で発生した熱を外部へ逃散させるととも
に、併せてこの導電性部材によつて放射雑音をシ
ールドして該放射雑音が筺体外に漏洩することを
防止したものである。
That is, a sheet-like conductive member with multiple through holes is placed opposite to a printed circuit board that incorporates a CRT power circuit, etc., and this conductive member and the ground pattern of the printed circuit board are electrically connected. By connecting the CRT through the through hole of this conductive member.
The heat generated within the device is dissipated to the outside, and the conductive member also shields radiation noise to prevent the radiation noise from leaking outside the housing.
以下、本発明の一実施例につき図面を用いて詳
細に説明する。
Hereinafter, one embodiment of the present invention will be described in detail using the drawings.
第１図は本発明のCRT表示装置の第１の実施
例を示す概念図、第２図は本発明のCRT表示装
置の第１の実施例の要部を拡大した斜視図、第３
図は本発明のCRT表示装置の第２の実施例を示
す斜視図、第４図は本発明のCRT表示装置の第
３の実施例を示す斜視図である。 FIG. 1 is a conceptual diagram showing a first embodiment of the CRT display device of the present invention, FIG. 2 is an enlarged perspective view of main parts of the first embodiment of the CRT display device of the present invention, and FIG.
This figure is a perspective view showing a second embodiment of the CRT display device of the present invention, and FIG. 4 is a perspective view showing a third embodiment of the CRT display device of the present invention.
第１図、および第２図にに示すように本発明の
CRT表示装置は、筺体１に設置されているCRT
２の電源回路等を構成しているメインプリント基
板３の裏面側のアースパターンに対向し、多数の
貫通孔４を設けたシート状の銅板等よりなる導電
性部材５を前記プリント基板より所定の間隔を隔
てて銅等により形成されたシールド板６によつて
支持した形で配設した点にある。 As shown in FIGS. 1 and 2, the present invention
The CRT display device is a CRT installed in housing 1.
A conductive member 5 made of a sheet-like copper plate or the like having a large number of through holes 4 is placed in a predetermined position from the printed circuit board, facing the ground pattern on the back side of the main printed circuit board 3 constituting the power supply circuit 2, etc. The structure is supported by shield plates 6 made of copper or the like and spaced apart from each other.
このシート状の導電性部材５はメインプリント
基板３のアースパターンと電気的に接続され、プ
リント基板３のアース電位と導電性部材５とは等
電位になつている。 This sheet-shaped conductive member 5 is electrically connected to the ground pattern of the main printed circuit board 3, so that the ground potential of the printed circuit board 3 and the conductive member 5 are at the same potential.
また本実施例に於いては、シート状の導電性部
材の厚さを0.66mm以上、貫通孔４の直径を1.14mm
以下、多数の貫通孔４の中心間の間隔を1.7mm、
またはシート状の導電性部材５の単位面積当たり
の孔の数として233個／645mm2としており、この
ようにすれば、例えば故障時に使用部品が焼損し
た事故が発生した時、燃焼物の落下が避けられ、
安全性の向上にもつながり、また電子部品が貫通
孔の間より落下して回路がシヨートするといつた
事故も避けられ、またシート状導電性部材の機械
的強度も満足する値が得られることが判明した。 In addition, in this example, the thickness of the sheet-like conductive member is 0.66 mm or more, and the diameter of the through hole 4 is 1.14 mm.
Below, the distance between the centers of the many through holes 4 is 1.7 mm,
Alternatively, the number of holes per unit area of the sheet-like conductive member 5 is 233 holes/645 mm 2 , and by doing so, for example, in the event of an accident where a used part is burnt out due to a failure, combustible materials will be prevented from falling. avoided,
It also leads to improved safety, avoids accidents such as electronic parts falling between the through holes and the circuit being shot, and also provides a satisfactory value for the mechanical strength of the sheet-like conductive member. found.
更にこのようにすればプリント基板３の主とし
てアースパターン側より発生する放射雑音がシー
ト状の導電性部材５によつて遮蔽され、測定の結
果、放射雑音レベルが4db〜8dbの範囲にわたつ
て減少することが判明した。 Furthermore, by doing this, the radiation noise generated mainly from the ground pattern side of the printed circuit board 3 is shielded by the sheet-like conductive member 5, and as a result of measurement, the radiation noise level is reduced in the range of 4 db to 8 db. It turned out to be.
更に本発明のCRT表示装置の第２の実施例を
第３図に示す。図示するように第２の実施例が、
第１の実施例と異なる点は、CRTの電源回路等
を構成するプリント基板５のアースパターンに対
向して、前記シート状の導電性部材５を、銅等の
導電性部材で形成した金属支柱７によつて支えて
いる点にある。この金属支柱の数はの図では４本
となつているが、この数は４本に限ることはな
く、またこの金属支柱７がプリント基板５のアー
スパターンと導通状態と成つて等電位に成つてい
る。 Furthermore, a second embodiment of the CRT display device of the present invention is shown in FIG. As shown in the figure, the second embodiment is
The difference from the first embodiment is that the sheet-shaped conductive member 5 is made of a metal support made of a conductive material such as copper, facing the ground pattern of the printed circuit board 5 constituting the power supply circuit of the CRT. It is supported by 7. Although the number of metal supports is four in the figure, this number is not limited to four, and this metal support 7 is electrically connected to the ground pattern of the printed circuit board 5 to reach an equal potential. It's on.
更に本発明のCRT表示装置の第３の実施例を
第４図に示す。図示するように本実施例では、上
部が開放で、底部に前記した貫通孔４を設けた直
方体形状の箱状の銅等よりなる遮蔽部材８を用
い、この遮蔽部材８を前記プリント基板３に対向
してこのプリント基板３と適当な支持具（図示せ
ず）を用いて配設している。そしてこの遮蔽部材
８とプリント基板３のアースパターンとが等電位
となるように接続している。 Furthermore, a third embodiment of the CRT display device of the present invention is shown in FIG. As shown in the figure, in this embodiment, a rectangular parallelepiped box-shaped shielding member 8 made of copper or the like is used, which is open at the top and has the through hole 4 described above at the bottom. The printed circuit board 3 is placed facing the printed circuit board 3 using a suitable support (not shown). This shielding member 8 and the ground pattern of the printed circuit board 3 are connected so as to have equal potential.
また以上の各実施例で述べた金属支柱７、導電
性シート５、シールド板６、または箱状遮蔽部材
８を形成する材料は銅等に限らず、アルミニウム
Al、ニツケルNi、鉄Fe等電気伝導度の良い材料
であれば、何れでも良い。 Furthermore, the material for forming the metal support 7, conductive sheet 5, shield plate 6, or box-shaped shielding member 8 described in each of the above embodiments is not limited to copper, etc., but is also made of aluminum.
Any material with good electrical conductivity, such as Al, Ni, or Fe, may be used.
以上述べたように本発明のCRT表示装置によ
れば、CRTの電源回路等を構成するメインプリ
ント基板より発生する放射雑音が、プリント基板
に対向して設けられ、かつ貫通孔を有する導電性
シールド板によつて遮蔽されているので、CRT
表示装置内の内部で発生した熱を外部へ逃散され
るとともに、CRT表示装置より外部に向かつて
雑音が漏洩するようなことがなくなり、このよう
なCRT表示装置をパーソナルコンピユータ等の
電子機器の表示部に用いれば、パーソナルコンピ
ユータ本体が誤動作等の不都合を生じない状態で
動作するので、高信頼度の電子機器が得られる効
果がある。
As described above, according to the CRT display device of the present invention, radiation noise generated from the main printed circuit board constituting the power supply circuit of the CRT can be removed by using a conductive shield provided opposite to the printed circuit board and having through holes. Since it is shielded by a board, the CRT
The heat generated inside the display device is dissipated to the outside, and no noise leaks from the CRT display device to the outside. If used in a section, the personal computer main body will operate without any inconvenience such as malfunction, resulting in a highly reliable electronic device.
第１図は本発明のCRT表示装置の第１の実施
例を示す概念図、第２図は本発明のCRT表示装
置の第１の実施例の要部拡大斜視図、第３図は本
発明のCRT表示装置の第２の実施例を示す斜視
図、第４図は本発明のCRT表示装置の第３の実
施例を示す斜視図である。
図に於いて、１は筺体、２はCRT、３はプリ
ント基板、４は貫通孔、５はシート状導電性部
材、６はシールド板、７は金属支柱、８は箱型遮
蔽部材を示す。
FIG. 1 is a conceptual diagram showing a first embodiment of the CRT display device of the present invention, FIG. 2 is an enlarged perspective view of essential parts of the first embodiment of the CRT display device of the present invention, and FIG. 3 is a conceptual diagram showing the first embodiment of the CRT display device of the present invention. FIG. 4 is a perspective view showing a second embodiment of the CRT display device of the present invention, and FIG. 4 is a perspective view showing a third embodiment of the CRT display device of the present invention. In the figure, 1 is a housing, 2 is a CRT, 3 is a printed circuit board, 4 is a through hole, 5 is a sheet-like conductive member, 6 is a shield plate, 7 is a metal support, and 8 is a box-shaped shielding member.
Claims (1)
を設け、かつ該熱放散用孔を有する筺体底部の上
方にCRT本体に接続されたプリント基板を設置
したCRT表示装置において、 前記プリント基板と筺体底部との間に該プリン
ト基板より所定の間隔を隔てて複数の貫通孔を有
する板状の導電性部材を配設し、該導電性部材と
プリント基板のアースパターンとを電気的に接続
したことを特徴とするCRT表示装置。 ２ 前記導電性部材がシート状であることを特徴
とする特許請求の範囲第１項に記載のCRT表示
装置。 ３ 前記導電性部材がプリント基板と対向する上
側部を開口し、筺体部と対向する下側部に複数の
貫通孔を設けた箱型形状であることを特徴とする
特許請求の範囲第１項に記載のCRT表示装置。[Scope of Claims] 1. A CRT display in which a plurality of heat dissipation holes leading to the outside are provided at the bottom of the casing, and a printed circuit board connected to the CRT main body is installed above the bottom of the casing having the heat dissipation holes. In the device, a plate-shaped conductive member having a plurality of through holes is arranged between the printed circuit board and the bottom of the casing at a predetermined distance from the printed circuit board, and a ground pattern of the conductive member and the printed circuit board is arranged. A CRT display device characterized by being electrically connected to. 2. The CRT display device according to claim 1, wherein the conductive member is sheet-shaped. 3. Claim 1, characterized in that the conductive member has a box-like shape with an open upper side facing the printed circuit board and a plurality of through holes provided in the lower side facing the casing. CRT display device described in .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16549984A JPS6142684A (en) | 1984-08-06 | 1984-08-06 | Crt display unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16549984A JPS6142684A (en) | 1984-08-06 | 1984-08-06 | Crt display unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6142684A JPS6142684A (en) | 1986-03-01 |
| JPH0335672B2 true JPH0335672B2 (en) | 1991-05-29 |
Family
ID=15813554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16549984A Granted JPS6142684A (en) | 1984-08-06 | 1984-08-06 | Crt display unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6142684A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0685665U (en) * | 1993-05-24 | 1994-12-13 | 順樹 木村 | Scissors |
| JP2008123339A (en) * | 2006-11-14 | 2008-05-29 | Sanyo Electric Co Ltd | Beverage dispenser |
| JP2009274767A (en) * | 2009-07-31 | 2009-11-26 | Sanyo Electric Co Ltd | Beverage dispenser |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS583094B2 (en) * | 1978-12-18 | 1983-01-19 | 愛知車輌株式会社 | Sheet pile press-in equipment and sheet pile press-in method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55159673U (en) * | 1979-05-04 | 1980-11-17 | ||
| JPS583094U (en) * | 1981-06-26 | 1983-01-10 | 株式会社日立製作所 | Plywood with metal foil for shielding |
-
1984
- 1984-08-06 JP JP16549984A patent/JPS6142684A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS583094B2 (en) * | 1978-12-18 | 1983-01-19 | 愛知車輌株式会社 | Sheet pile press-in equipment and sheet pile press-in method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6142684A (en) | 1986-03-01 |
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