1334753 九、發明說明： 【發明所屬之技術領域】 種可較好遮罩雜 本發明係關於一種印刷電路板，尤指一 訊之印刷電路板。 【先前技術】 石英晶體振S關稱晶振’其為高精度和高穩定产 遺L被廣泛應用於電視、電腦、遙控器等各類振: =及^通信祕巾用作頻率發生器，爲資料處理1334753 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a printed circuit board, and more particularly to a printed circuit board. [Prior Art] Quartz crystal oscillator S is called crystal oscillator. It is a high-precision and high-stability production. L is widely used in televisions, computers, remote controls, etc.: = and ^ communication secrets are used as frequency generators. Data processing
ΐίΐ和祕定纽提供基準訊號。由於晶振具有小型化: ^精度、高穩定度、低雜訊、高頻化：低功耗、快速啓動等 特點’還被應肖於t齡機板上，與彡稱鐘發生器晶片連 接在一起’晶振産生高頻脈衝波，輸入到時鐘發生器 透過整形與分頻，然後提供電腦所需要之各種頻率。 一第一圖爲習知印刷電路板上晶振之佈局圖。如第一圖所 =印刷電路板包括一元件放置區域10、一第一通孔20、一第 一通孔21、一第三通孔22及一第四通孔23。該元件放置區 域10用+於放置晶振，該晶振之管腳可對應插接於該第一通孔 20及該第二通孔21中。該第三通孔22及該第四通孔23分別 連，至該印刷電路板之接地層，用於固定該晶振。在將該晶 振安裝到該印刷電路板上時，一般將晶振之管腳插接於該第 一通孔20及該第二通孔21，然後使用一金屬絲將該晶振之實 體it過該第三通孔22及該第四通孔23固定至該印刷電路板 之兀件放置區域10，則該晶振之實體橫置於該印刷電路板。 晶振在工作時’透過該第一通孔2〇及該第二通孔21傳 遞時鐘訊號至該印刷電路板之相關層電路中，而晶振本身在 時鐘跳變過程產生之雜訊透過其表面之金屬外殼傳至該金屬 絲’該金屬絲再傳至該印刷電路板之接地層。由於該金屬絲 與晶振表面之金屬外殼接觸面積較小，故透過該金屬絲遮罩 該晶振産生之雜訊效果不佳。 5 1334753 【發明内容】 有鑒於此，有必要提供一種可較好遮罩雜訊之印刷電路 板。 一種印刷電路板，其包括一元件放置區域、位於該元件 放置區域一側之兩通孔及位於該元件放置區域中部之兩通 孔’該70件放置區域中部之兩通孔分別連接至該印刷電路板 之接地層，該元件S置區域用.於放置一元件，該元件之管腳 可對應插接於該元件放置區域—側之兩通孔巾，該元件放置 區域中部之兩通孔用於固定該元件，該元件放置區域設有— 銅箔，該銅箔與該元件放置區域中部之兩通孔電連接。 相較習知技術，該印刷電路板透過在與元件接觸面設置 銅箱及阻焊漆’在元件I作時，可將元件産生之雜訊傳至印 刷電路板之接地層’提高元件工作之穩定性。 【實施方式】 請參考第二圖，其爲本發明印刷電路板較佳實施方式之 佈局圖。該印刷電路板包括一頂層訊號層及一接地層。 本實施例中印刷電路板包括一長方形元件放置區域4〇、 位於該元件放置區域4〇 —側之一第一通孔5〇、一第二通孔 52、位於該元件放置區域中部之一第三通孔54及一第四通孔 56。該元件放置區域4〇設有一銅箔42,其位於該印刷電路板 之頂層=號層。鄰近該第三通孔Μ及該第四通孔56之銅箔 42上覆蓋一層阻焊漆44。該阻焊漆44之寬度大於umii。 該元件放，區域4〇用於放置晶振，該晶振爲插接式晶 振。該晶振之管腳可對應插接於該第一通孔5〇及該第二通孔 52中，該晶振工作時所産生之高頻脈衝波訊號透過該第一通 孔50及該第一通孔52爲該印刷電路板提供時鐘頻率。該第 三通孔54及該第四通孔56分別連接至該印刷電路板之接地 層，用於固定該晶振之實體。 在應用時，將該晶振之兩管腳對應插接於該第一通孔5〇 6 1334753 ^該第二通孔52中，使用一金屬絲將該晶振之實體透過該第 二通孔54及該第四通孔56固定至該元件放置區域4〇，並將 該金屬絲之末端烊接至該第三通孔54及該第四通孔56。藉由 該晶振之金屬外殼與該銅箔42直接接觸，使得該晶振在時鐘 跳變時所産生之雜訊可直接透職_ 42傳至該第三通孔 54或該第四通孔56，透過該第三通孔％或該第四通孔％傳 至該印刷電路板之接地層，實現遮罩雜訊。. 本實施例中由於該銅箔42可與該晶振之金屬外殼直接接 觸，且接觸面積較大’使得該晶振工作時所産生之雜訊以最 ^路徑傳至該印刷電路板之接地層，遙罩雜訊效果較好。同 時，該阻焊漆44可避免該印刷電路板過錫爐時産生浮錫，且 可防止焊接該金屬絲時該銅箔42導走焊錫。 综上所述，本發明符合發明專利要件，爰依法提出專利 申睛。惟，以上所述者僅為本發明之較佳實施例，舉凡熟悉 本案技藝之人士，在援依本發明精神所作之等效修飾或變 化’皆應包含於以下之申請專利範圍内。 【圖式簡單說明】 第一圖係習知印刷電路板上晶振之佈局圖。 第二圖係本發明印刷電路板較佳實施方式之佈局圖。 【主要元件符號說明】 [習知] 疋件放置區域 10 第一通孔 20 第二通孔 21 第三通孔 22 第四通孔 23 [本發明1 元件放置區域 40 第一通孔 50 第二通孔 52 第三通孔 54 第四通孔 56 銅箔 42 阻焊漆 44 7Ϊ́ίΐ and 秘定纽 provide benchmark signals. Due to the miniaturization of the crystal oscillator: ^ Accuracy, high stability, low noise, high frequency: low power consumption, fast start, etc. 'It is also on the t-board, connected to the nickname clock generator chip. Together, the crystal oscillator generates high-frequency pulse waves that are input to the clock generator to shape and divide the frequency, and then provide the various frequencies required by the computer. A first figure is a layout diagram of a crystal oscillator on a conventional printed circuit board. As shown in the first figure, the printed circuit board includes a component placement area 10, a first through hole 20, a first through hole 21, a third through hole 22, and a fourth through hole 23. The component placement area 10 is mounted with a +, and the pins of the crystal oscillator are correspondingly inserted into the first through hole 20 and the second through hole 21. The third through hole 22 and the fourth through hole 23 are respectively connected to a ground layer of the printed circuit board for fixing the crystal. When the crystal oscillator is mounted on the printed circuit board, the pin of the crystal oscillator is generally inserted into the first through hole 20 and the second through hole 21, and then the body of the crystal oscillator is passed through the wire using a wire. The three-way hole 22 and the fourth through hole 23 are fixed to the component placement area 10 of the printed circuit board, and the solid of the crystal oscillator is placed across the printed circuit board. During operation, the crystal oscillator transmits a clock signal to the associated layer circuit of the printed circuit board through the first through hole 2 and the second through hole 21, and the noise generated by the crystal itself during the clock transition passes through the surface thereof. The metal casing is passed to the wire, which is then passed to the ground plane of the printed circuit board. Since the wire has a small contact area with the metal casing of the surface of the crystal oscillator, the noise generated by the crystal through the wire mask is not good. 5 1334753 SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a printed circuit board that can better mask noise. A printed circuit board comprising a component placement area, two through holes on one side of the component placement area, and two through holes in the middle of the component placement area. Two through holes in the middle of the 70 placement areas are respectively connected to the printing a grounding layer of the circuit board, the component S is disposed in an area for placing a component, and the pin of the component can be correspondingly inserted into the two-way aperture towel on the side of the component placement area, and the two through holes in the middle of the component placement area are used The element is fixed, and the component placement area is provided with a copper foil electrically connected to the two through holes in the middle of the component placement area. Compared with the prior art, the printed circuit board is provided with a copper box and a solder resist lacquer on the contact surface of the component. When the component I is used, the noise generated by the component can be transmitted to the ground layer of the printed circuit board to improve the component operation. stability. [Embodiment] Please refer to the second figure, which is a layout view of a preferred embodiment of a printed circuit board of the present invention. The printed circuit board includes a top layer signal layer and a ground layer. In this embodiment, the printed circuit board includes a rectangular component placement area 4〇, a first through hole 5〇 located in the component placement area 4〇, a second through hole 52, and a middle portion of the component placement area. A three-way hole 54 and a fourth through hole 56. The component placement area 4 is provided with a copper foil 42 located on the top layer of the printed circuit board. The copper foil 42 adjacent to the third via hole and the fourth via hole 56 is covered with a solder resist 44. The solder resist 44 has a width greater than the miii. The component is placed, and the region 4 is used to place a crystal oscillator, which is a plug-in crystal. The pin of the crystal oscillator is correspondingly inserted into the first through hole 5 〇 and the second through hole 52, and the high frequency pulse wave signal generated by the crystal oscillator is transmitted through the first through hole 50 and the first pass Hole 52 provides a clock frequency for the printed circuit board. The third via hole 54 and the fourth via hole 56 are respectively connected to a ground layer of the printed circuit board for fixing the entity of the crystal oscillator. In the application, the two pins of the crystal oscillator are correspondingly inserted into the first through hole 5 〇 6 1334753 ^ the second through hole 52, and a metal wire is used to pass the crystal through the second through hole 54 and The fourth through hole 56 is fixed to the component placement area 4〇, and the end of the wire is connected to the third through hole 54 and the fourth through hole 56. The metal casing of the crystal oscillator is in direct contact with the copper foil 42 so that the noise generated by the crystal oscillator during the clock jump can be directly transmitted to the third through hole 54 or the fourth through hole 56. The masking noise is realized by the third through hole % or the fourth through hole % being transmitted to the ground layer of the printed circuit board. In this embodiment, since the copper foil 42 can be in direct contact with the metal casing of the crystal oscillator, and the contact area is large, the noise generated when the crystal oscillator is operated is transmitted to the ground layer of the printed circuit board in the most path. The remote cover noise is better. At the same time, the solder resist 44 prevents floating tin from being generated when the printed circuit board passes through the tin furnace, and prevents the copper foil 42 from guiding solder when the wire is soldered. In summary, the present invention complies with the requirements of the invention patent, and proposes a patent for the eye. However, the above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims. [Simple description of the diagram] The first figure is a layout diagram of a crystal oscillator on a printed circuit board. The second drawing is a layout view of a preferred embodiment of the printed circuit board of the present invention. [Explanation of main component symbols] [Generally known] 放置 放置 区域 10 第一 第一 第一 第一 10 10 10 10 10 10 10 10 第三 第三 第三 [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ Through hole 52 third through hole 54 fourth through hole 56 copper foil 42 solder resist paint 44 7