PT1387 28640twf.doc/n 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種燈管連接器，且特別是有關於一 種可應用於背光模組的燈管連接器。 【先前技術】 隨著液晶顯示器的製作技術快速的進步，以其具有 輕、^、省電與無輪射等優點，使得液晶顯示器廣泛地應 用於仃動電②、個人數位助理、筆記型電腦及液晶電視機 等。然而’由於液晶面板並非自發光鶴示裝置，故 借助背光模組所提供之紐，才㈣顯示光學影像/、 7光源位置及光路的不同’背光模組包括側向入光 直=背光模組乃是將-組水平分 &㈣u错由_組位於這組燈管上方 加以處理後輸出。前述的每根燈管所具有的一對端 二電=藉光模組的電路 件，連/器為—藉由沖壓方式成型的金屬 住。屬件之—對彈片卡人其#而被固定 端電極分別=二3管需要更換時，減將舊燈管的 的端電i ·的料連接器中«，再安裝入新燈管 然而，前述金屬件的這此 後產生彈性疲乏，使得燈管===易在多次彈性變形 逆接為無法彈性地夾持燈管的 PT1387 28640twf.doc/n 而电極。因此’過大展動可能使燈管的端電極從全屬件的 這對彈片間跳脫。並且，燈管於級裝時所可 應力容易導致燈管在遭受衝擊時斷裂。 的殘留 【發明内容】 本伽是指-種燈料㈣，其可 耦接至電路板。 s疋位及生 本發明之-實_提供—種適於將燈管的 接至電路板的燈管連接器，其包括-絕緣基 ϊ門及ί個彈性元件。絕緣基座構成-容置 ς -有底部。母一導電端子具有一鮮接部及一夹持 ί個祕部㈣絕職朗底料銲接至電路板，而 母j持部從對應的銲接部延伸至容置空間内。這些彈性 :凌：!“免置於絕緣基座與這些夾持部之間，用以迫使這 二夾持°卩共同夾持端電極。 ，本發明之—實關t，上収絕緣基座的底部為一 緣基座具有多個豎m與底板構成容置空 間’而導電f子從底板下方穿過底板而延伸至容置空間内。 在本發明之一實施例中，上述之每個鲜接部具有一開 及-銲料’銲料係填入開口中。 電極=明之-實施例中’上述之夾持部的形狀配合端 在，發明之—實施例中，上述之每個導電端子更具有 岭引。P，而這些導引部共同導引端電極進入這些夾持部 Ρ'Π387 28640twf.doc/n 之間。 在本發明之一實施例中，上述之每個導電端子具有一 倒鉤，倒鉤與絕緣基座發生結構干涉而將導電端子定位於 絕緣基座上。 在本發明之一貫施例中，上述之彈性元件為多個壓縮 彈簧，而每個導電端子具有一定位凸點，其嵌合於與其對 應的彈性元件，用以限制這些壓縮彈簧分別相對於這些夾 持部的位置。 一 在本發明之一實施例中，燈管連接器更包括多個固定 件，且每個固定件具有一固定銷，其中絕緣基座具有多個 •a板，豎板與底部構成容置空間，豎板並具有多個軸孔， 而這些彈性元件為多個壓縮彈簧，且固定銷緊配至對應的 軸孔，並被對應的壓縮彈簧套合，用以限制這些壓^笼 相對於絕緣基座的位置。 / ^ 在本發明之一實施例中，上述之彈性元件延伸至與其 對應的轴孔内。 ' 在本發明之一實施例中，燈管連接器更包括一限位元 件，其具有一樞接部、一扣接部及一限位部，其中樞接部 樞接至絕緣基座，扣接部可拆卸地扣接至絕緣基座，而限 位部限制端電極於燈管的中心轴延伸線上的位置。 綜上所述，在本發明之上述實施例中，燈管連接哭可 將燈管的端電極定位及電性耦接至電路板。相較於習^技 術中由單—金屬賴構成的燈管連接ϋ，本糾之上述· 施例的燈管連接㈣雜元件較不料產生雑疲乏^ 1342378 · PTI387 28640twf.doc/n 人更換^後’燈管連接器仍可彈性地夹持燈管的 端電極。 ，讓本發明之上述特徵和優點能更明顯易懂，下文特 舉-個貫施例’並配合所_式，作詳細說明如下。 【實施方式】 下列各實施例的說明是參考附加的圖式，用以例示本 心之特定實_。本發明所提到的方向用 J，例如「上」、「下」、「前」、「後」、「左」、「右」 專’僅是參考附加圖式的方向。因此，使用的方向用語是 用來說明，而非用來限制本發明。 圖1為本發明之一實施例之—種燈管連接器將燈管定 t及電性祕至電路板的示意圖。圖2為圖丨之燈管連接 。。的爆炸圖0凊同時參考圖1及圖2，本實施例之燈管連 接态100適於配置在直下式背光模組的電路板3⑻上，用 以，燈管200定位及電性耦接至電路板3〇〇。燈管2〇〇例 鲁 如是冷陰極螢光燈管。本實施例之燈管連接器100包括一 絕緣基座110、多個導電端子120及多個彈性元件13〇。 絕緣基座110的底部為一底板112，絕緣基座110可 ^有多個豎板114，其中底板112與這些豎板114構成一 谷置空間l10a。這些導電端子120可從絕緣基座no的底 板U2下方穿過底板112後而向上延伸至容置空間u〇a 内。 4細來說，每個導電端子120具有一銲接部121及一 夹持部122 ’其中銲接部121位於絕緣基座11〇的底部並 8 1342378 .. PT1387 28640hvf.d〇c/n 可用以銲接至電路板3〇〇，而夹持部122從對應的銲接部 121向上延伸至絕緣基座u〇的容置空間u〇a内。 。 銲接部121更可具有一開口 12la及一焊料（圖未示》 開口 121a用以增加銲料接觸的面積。更進一步地說，將銲 接部121銲接至電路板300時，銲料可填入於開口 中以使麵接部121可透過銲料而更穩固地連接至電路板PT1387 28640twf.doc/n IX. Description of the Invention: [Technical Field] The present invention relates to a lamp connector, and more particularly to a lamp connector that can be applied to a backlight module. [Prior Art] With the rapid advancement of the manufacturing technology of liquid crystal displays, the liquid crystal display is widely used in the mobile power 2, the personal digital assistant, and the notebook computer because of its advantages of lightness, power consumption, power saving and no rotation. And LCD TVs, etc. However, since the liquid crystal panel is not a self-illuminating crane device, the backlight module provides a button to display the optical image/, 7 light source position and optical path. The backlight module includes a lateral light input backlight module. That is, the -group level score & (four) u error is processed by the _ group located above the set of lamps, and then output. Each of the foregoing lamps has a pair of terminals, a circuit member of the optical module, and a device that is formed by stamping. Dependent on the shrapnel card people # and the fixed end electrode = two 3 tubes need to be replaced, minus the end of the old lamp tube i · the material connector «, then install into the new lamp tube, however, The aforementioned metal member is then elastically fatigued, so that the lamp tube === is easily reversed in multiple elastic deformations to the electrode of the PT1387 28640twf.doc/n which cannot elastically hold the lamp tube. Therefore, excessive expansion may cause the end electrodes of the lamp to escape from the pair of shrapnel of the all-parts. Moreover, the stress that can be applied to the lamp during the stage is likely to cause the lamp to break when subjected to an impact. Residuals [Invention] This gamma refers to a type of lamp (4) that can be coupled to a circuit board. The present invention provides a lamp connector suitable for connecting a lamp to a circuit board, which includes an insulating base and an elastic member. Insulated base construction - accommodation ς - has a bottom. The female-conductive terminal has a fresh joint and a clamping portion. (4) The inauguration material is welded to the circuit board, and the female holding portion extends from the corresponding soldering portion into the accommodating space. These elasticity: Ling:! "free between the insulating base and the clamping portion, forcing the two clamping members to clamp the terminal electrode together. The present invention - the actual closing t, the upper receiving insulating base The bottom portion is a rim base having a plurality of vertical m and the bottom plate forming an accommodating space' and the conductive ferrule extends from the bottom of the bottom plate through the bottom plate to extend into the accommodating space. In one embodiment of the present invention, each of the above The fresh joint has an open-and-solder solder-filled opening. The electrode = the same - in the embodiment, the shape-matching end of the above-mentioned clamping portion, in the invention - the embodiment, each of the above-mentioned conductive terminals is further There is a ridge, P, and the guiding portions collectively lead the terminal electrodes into between the clamping portions Ρ Π 387 28640 twf.doc/n. In one embodiment of the invention, each of the above-mentioned conductive terminals has a reverse The hook and the barb are structurally interfered with the insulating base to position the conductive terminal on the insulating base. In a consistent embodiment of the invention, the elastic element is a plurality of compression springs, and each of the conductive terminals has a positioning convex. Point, which is fitted to its corresponding elastic element For limiting the position of the compression springs relative to the clamping portions, respectively. In an embodiment of the invention, the lamp connector further comprises a plurality of fixing members, and each fixing member has a fixing pin, wherein the insulation The base has a plurality of plates, the vertical plate and the bottom portion constitute an accommodation space, and the vertical plate has a plurality of shaft holes, and the elastic members are a plurality of compression springs, and the fixing pins are tightly fitted to the corresponding shaft holes, and are Corresponding compression springs are engaged to limit the position of the cages relative to the insulating base. / ^ In an embodiment of the invention, the elastic members extend into their corresponding axial bores. In one embodiment, the lamp connector further includes a limiting component having a pivoting portion, a fastening portion and a limiting portion, wherein the pivoting portion is pivotally connected to the insulating base, and the fastening portion is detachable The grounding portion is fastened to the insulating base, and the limiting portion limits the position of the end electrode on the extension line of the central axis of the lamp tube. In summary, in the above embodiment of the invention, the lamp tube is connected to the end of the lamp tube. The electrodes are positioned and electrically coupled to the circuit board. Compared with the lamp connection made of single-metal lai in the technology, the lamp connection (4) of the above-mentioned embodiment is less than expected to produce fatigue. 1342378 · PTI387 28640twf.doc/n 'The lamp connector can still elastically clamp the end electrode of the lamp tube. The above features and advantages of the present invention can be more clearly understood, and the following is a detailed description of the embodiment of the present invention. [Embodiment] The following description of each embodiment refers to an additional drawing for exemplifying the specific meaning of the present invention. The directions mentioned in the present invention are J, such as "upper", "lower", and "previous". "," "back", "left", "right" are only referring to the direction of the additional drawing. Therefore, the directional terminology used is for the purpose of illustration and not limitation. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a lamp connector for fixing a lamp and an electrical property to a circuit board according to an embodiment of the present invention. Figure 2 shows the lamp tube connection of Figure 。. . The illuminating diagram of the lamp is connected to the circuit board 3 (8) of the direct type backlight module for positioning and electrically coupling the lamp tube 200 to the circuit board 3 (8) of the direct type backlight module. The board is 3 〇〇. Lamp 2 example Lu Ru is a cold cathode fluorescent tube. The lamp connector 100 of this embodiment includes an insulating base 110, a plurality of conductive terminals 120, and a plurality of elastic members 13A. The bottom of the insulating base 110 is a bottom plate 112. The insulating base 110 can have a plurality of risers 114, and the bottom plate 112 and the risers 114 form a valley space l10a. These conductive terminals 120 may extend upward from the bottom plate U2 of the insulating base no through the bottom plate 112 and extend upward into the accommodating space u 〇 a. 4 In detail, each of the conductive terminals 120 has a soldering portion 121 and a clamping portion 122' wherein the soldering portion 121 is located at the bottom of the insulating base 11〇 and 8 1342378 .. PT1387 28640hvf.d〇c/n can be used for soldering To the circuit board 3〇〇, the clamping portion 122 extends upward from the corresponding soldering portion 121 into the receiving space u〇a of the insulating base u〇. . The soldering portion 121 may further have an opening 12la and a solder (not shown) opening 121a for increasing the area of the solder contact. Further, when the soldering portion 121 is soldered to the circuit board 300, the solder may be filled in the opening. So that the interface portion 121 can be more firmly connected to the circuit board through the solder.
3〇〇。如此一來，燈管連接器100與電路板3〇〇之間可且 較佳的接合強度。 此外，在本實施例中，每個導電端子120可具有一導 引邛123。藉由成對的導引部123的相互配合，可將端電 極220順利地導引至成對的夾持部122之間。因此，使組 裝人員在推移燈管200時更為方便且可節省組裝時間。、 為了達到更佳的固定燈管200的效果，這些夾持部122 ，形狀可配合端電極220的外形而作調整。因此，藉由這 ^夾持部122來彈性地夾持端電極22〇 ’可使燈管2〇〇的 端電極220較不易從對應的燈管連接器100中跳脫出來。 在本實施例中，燈管連接器100更包括多個固定件 4〇 ’而每個固定件140可具有一固定銷142。此外，絕緣 土座110可具有多個軸孔116，其分別形成於這些豎板114 ^。每個固定銷142穿過對應的軸孔116，並被對應的彈 性元件130套合。 這些彈性元件13〇分別設置於絕緣基座110與這些夾 、。卩122之間，其中彈性元件13〇也可延伸至對應的軸孔 八6内。这些彈性元件13〇相對於絕緣基座HQ的位置可 刀別受到這些固定銷142的限制。 9 PT1387 2864〇twf.d〇c/l 另外，這些導電端子l2〇 嚴合於對應的彈性元件13Q，^凸點以，其 於夾持部122的位置。因此，二性元件130相對 定位凸點124，可限制=些固定銷142與這些 ⑽及導電端子^=㊣紅件13G相對於絕緣基座 施例，本實 恢復力。所更優良的彈性 端電極3 η 持部122來彈性地夾持燈管的 U 2〇 因而具有良好固定燈管200的效果。 燈管2(Κ)之成對的端電極220安裝至成對的 組= 些彈性元件130可緩衝燈管於 到Μ Μ ^產生的朗應力，進爾低燈管2GG瞬間受 到過大衝擊而斷裂的機率。 听]又 在本實施例中，導電端子⑽也可具有—倒鉤⑵， 二位於銲料m與崎部122之間。因此，當導 ::0的夾持部122穿過底板112而延伸至容置空間二内 125可與底板112發生結構干涉爾導電端子120 保持於絕緣基座110上。 圖3A至圖3C為圖1之燈管連接器岐燈管的過程。 "Α至圖4C分別為圖3Α至圖3c所繪示之燈管 的側，圖。請先參考圖3Α、圖4Α、圖3Β及圖4β，首二 ，燈管200的端電極22〇移至燈管連接器1〇〇的上方，接 著再向下卡入燈管連接器100中即可完成。 詳細來說，燈管200的端電極220藉由成對的導引部 PT1387 28640twf.doc/n 的配合而受力向下移動。當施力足以使彈性元件130 壓，至一定長度時’端電極220即可順利地進入成對的失 持，122之間。接著’彈性元件nG f因其彈性恢復力而 =復原狀，使得成對的夾持部122接近定位凸點124的部 分再^閉合。因此，彈性元件13G可迫使成封祕部122 共同彈性地夾持端電極22G。此時，除了燈管連接器㈣ 與端電極220相電性耗接之外，燈管2〇〇的端電極22〇亦 受到燈管連接器1〇〇的定位。 ,然而，在燈管200的端電極22〇置入燈管連接器1〇〇 後，端電極220仍可相對於絕緣基座11〇地於燈管2〇〇的 中心，延伸線A上移動。因此’為了避免燈管2⑼的移動， 在本實施财’燈管連接ti⑽更可以具有-限位元件 限位7L件150具有一樞接部152、一扣接部〗54及一 F位邛156。樞接部152槐接至絕緣基座以使限位$ 件150可繞著拖軸相對於絕緣基座110作-小角度的每 轉。扣接部154可拆卸地扣接至絕緣基座11〇。限位部15< 可限制柒電極220於燈管200的中心軸延伸線a上的位置 圖5為圖3C之燈管連接器的俯視圖。請參考圖3B、 圖3C、圖4C及圖5,限位元件150可被推動而續 ，區軸相對於絕緣基座11G作—小角度的旋轉，進而可使 =部154扣接至絕緣基座11〇。當扣接部m扣接至絕 端的登板114時，限位部156可抵靠燈管200的 达=極220。所以，藉由本實施例之限位部156，可克服燈 s 200有長短不均的問題。 1342378 PT1387 2864〇twf.doc/n =卜’根據上述圖Μ至圖sc所繪示的步驟反向摔 乍，^即可自燈管連接器1GG上被拆卸下來。 Μ ’在本發明之上述實施例中，在多次更換燈 ^ 官連接H的彈性元件仍可保有彈性以配合導電端 =炎持部來夾持燈管的端電極。此外，彈性^件可緩衝 ‘丘g於、.且裝日调可能產生的殘留應力，進而降低燈管受 過大衝擊而斷裂的機率，故可降低成本。 太恭發明已以實施例揭露如上’然其並非用以限定 ίίΐΐ何所屬技術領域中具有通常知識者，在不脫離 ϋ月之f神和範圍内，當可作些許之更動與潤飾，因此 準ί乾圍當視後附之中請專利範圍所界定者為 本發明所搞5發_任—實施例或中請專利範圍不須達成 本《月所揭狀全部目的或優點或特點。另外，摘 ==輔助專利文件搜尋之用’並非用來限制: 【圖式簡單說明】 位:種燈管連接_管定 圖2為圖1之燈管連接器的爆炸圖。 = =3C為圖1之燈管連接器固定燈管的過程。 圖4A至圖4C分別為圖3八至圖3 接器的側視圖。 丁s運 圖5為圖3C之燈管連接器的俯視圖。 12 1342378 PT1387 28640twf.doc/n 【主要元件符號說明】 100 :燈管連接器 110 :絕緣基座 110a :容置空間 112 :底板 114 :豎板 116 :軸孔 120 :導電端子 φ U1 :銲接部 121a :開口 122 :夾持部 123 :導引部 124 :定位凸點 125 :倒鉤 130 :彈性元件 140 :固定件 142 :固定銷 Φ 150 :限位元件 152 :樞接部 154 :扣接部 156 :限位部 200 :燈管 220 :端電極 300 :電路板3〇〇. As a result, a good bonding strength between the lamp connector 100 and the circuit board 3 can be achieved. Further, in the present embodiment, each of the conductive terminals 120 may have a guide turn 123. The end electrodes 220 can be smoothly guided between the pair of nip portions 122 by the mutual engagement of the pair of guiding portions 123. Therefore, it is more convenient for the assembler to move the lamp 200 and save assembly time. In order to achieve a better effect of fixing the lamp tube 200, the shape of the clamping portion 122 can be adjusted in accordance with the shape of the end electrode 220. Therefore, by elastically clamping the terminal electrodes 22A' by the clamping portion 122, the terminal electrodes 220 of the bulb 2's are less likely to escape from the corresponding lamp connector 100. In the present embodiment, the lamp connector 100 further includes a plurality of fixing members 4'' and each of the fixing members 140 may have a fixing pin 142. Further, the insulating earth base 110 may have a plurality of shaft holes 116 formed in the risers 114, respectively. Each of the fixing pins 142 passes through the corresponding shaft hole 116 and is fitted by the corresponding elastic member 130. These elastic members 13 are respectively disposed on the insulating base 110 and the clips. Between the crucibles 122, the elastic members 13A can also extend into the corresponding shaft holes VIII6. The position of these elastic members 13 〇 relative to the insulating base HQ can be limited by these fixing pins 142. 9 PT1387 2864〇twf.d〇c/l In addition, these conductive terminals 12 are strictly aligned with the corresponding elastic members 13Q, and the bumps are located at the position of the holding portion 122. Therefore, the two-dimensional element 130 is opposite to the positioning bump 124, and can limit the fixing pin 142 and the (10) and the conductive terminal ^= the red component 13G with respect to the insulating base. The more excellent elastic end electrode 3 η holding portion 122 elastically holds the U 2 of the lamp tube and thus has the effect of fixing the lamp tube 200 well. The pair of end electrodes 220 of the lamp tube 2 (Κ) are mounted to a pair of groups = some of the elastic members 130 can buffer the light stress generated by the lamp tube to the Μ Μ ^, and the low lamp tube 2GG is momentarily subjected to an excessive impact and breaks. The chance. In the present embodiment, the conductive terminal (10) may also have a barb (2), and the second is located between the solder m and the sacrificial portion 122. Therefore, when the clamping portion 122 of the ::0 extends through the bottom plate 112 and extends into the accommodating space 2, the structure of the conductive terminal 120 can be held on the insulating base 110 by structural interference with the bottom plate 112. 3A to 3C show the process of the lamp connector of the lamp connector of Fig. 1. "Α to Fig. 4C are the sides of the tube shown in Figs. 3A to 3c, respectively. Please refer to FIG. 3Α, FIG. 4Α, FIG. 3Β and FIG. 4β. First, the terminal electrode 22 of the lamp tube 200 is moved to the upper side of the lamp connector 1〇〇, and then clamped down into the lamp connector 100. It can be done. In detail, the terminal electrode 220 of the lamp tube 200 is forced downward by the cooperation of the pair of guiding portions PT1387 28640twf.doc/n. When the force is applied enough to press the elastic member 130 to a certain length, the end electrode 220 can smoothly enter between the paired suspensions 122. Then, the elastic member nG f is restored by its elastic restoring force, so that the portions of the pair of holding portions 122 close to the positioning projections 124 are closed again. Therefore, the elastic member 13G can force the sealing portion 122 to elastically hold the terminal electrode 22G together. At this time, in addition to the electrical connection between the lamp connector (4) and the terminal electrode 220, the terminal electrode 22 of the lamp tube 2 is also positioned by the lamp connector 1A. However, after the terminal electrode 22 of the lamp tube 200 is placed in the lamp connector 1 , the terminal electrode 220 can still move relative to the insulating base 11 at the center of the lamp 2 ,, and the extension line A moves. . Therefore, in order to avoid the movement of the lamp tube 2 (9), the lamp tube connection ti (10) may have a - limiting element limit 7L member 150 having a pivoting portion 152, a fastening portion 54 and an F position 156. . The pivoting portion 152 is coupled to the insulative base such that the limit member 150 can be rotated at a small angle with respect to the insulating base 110 about the trailing axis. The fastening portion 154 is detachably fastened to the insulating base 11A. The limiting portion 15< can limit the position of the crucible electrode 220 on the central axis extension line a of the bulb 200. Fig. 5 is a plan view of the bulb connector of Fig. 3C. Referring to FIG. 3B, FIG. 3C, FIG. 4C and FIG. 5, the limiting member 150 can be pushed, and the region axis rotates at a small angle with respect to the insulating base 11G, so that the = portion 154 can be fastened to the insulating base. Block 11 〇. When the fastening portion m is fastened to the end plate 114, the limiting portion 156 can abut the up to the pole 220 of the lamp tube 200. Therefore, with the stopper portion 156 of the present embodiment, the problem that the lamp s 200 has uneven length can be overcome. 1342378 PT1387 2864〇twf.doc/n =b' The reverse is broken according to the steps shown in the above figure to figure sc, and can be removed from the lamp connector 1GG. ’ ′ In the above embodiment of the invention, the elastic member that replaces the lamp connection H a plurality of times can still retain elasticity to match the conductive end = the holding portion to hold the end electrode of the lamp tube. In addition, the elastic member can buffer the residual stress that may be generated by the day-to-day adjustment, thereby reducing the probability of the lamp being broken by a large impact, thereby reducing the cost. The invention has been disclosed in the above embodiments. However, it is not intended to limit the ordinary knowledge of the technical field, and it is possible to make some changes and refinements without departing from the realm of the moon.干 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ In addition, extract == auxiliary patent file search is not used to limit: [Simple description of the figure] Bit: kind of lamp connection _ pipe Figure 2 is an exploded view of the lamp connector of Figure 1. = = 3C is the process of fixing the lamp to the lamp connector of Figure 1. 4A to 4C are side views of the connector of Fig. 3 to Fig. 3, respectively. Figure 5 is a top plan view of the lamp connector of Figure 3C. 12 1342378 PT1387 28640twf.doc/n [Description of main component symbols] 100 : Lamp connector 110 : Insulation base 110a : Housing space 112 : Base plate 114 : Vertical plate 116 : Shaft hole 120 : Conductive terminal φ U1 : Welded part 121a: opening 122: clamping portion 123: guiding portion 124: positioning bump 125: barb 130: elastic member 140: fixing member 142: fixing pin Φ 150: limiting member 152: pivoting portion 154: fastening portion 156: Limiting portion 200: Lamp 220: terminal electrode 300: circuit board