201144610 六、發明說明： 本申請案主張於2010年04月15號向韓國智慧財產局 提出申請之韓國專利申請案第20-2010-0003986號的優先 權’該專利申請案所揭露之内容系完整結合於本說明書中。 【發明所屬之技術領域】 本發明是有關於一種用於基於風扇的轉速（r〇tati〇n speed)以改變發光二極體（iight_emitting diode)的色彩的 風扇組件，更具體地說，本發明是有關於一種用於基於脈 寬調變（pulse-width modulation, PWM)訊號的工作週期 (duty cycle)來改變風扇的轉速以及發光二極體的色彩的 風扇組件，以允許使用者在視覺上檢查（check)風扇的轉 速。 【先前技術】 風扇被使用於電腦或各種工業和家用冷卻器（co〇ler) 或者冷卻風扇中，以及基於安裝在主板 (main board)上 的風扇驅動單元所提供的脈寬調變（pulse_width modulation，PWM)訊號’以控制風扇的轉速。風扇驅動單 元基於待被冷卻的物件（例如，晶片組）的溫度來提供PWM 訊號，以及風扇控制單元基於已提供的PWM訊號的工作 週期來控制風扇的轉速。 然而’能夠調整風扇的轉速的一般的風扇組件不允許 使用者輕易地檢查風扇的轉速。只不過，使用者可以基於 風扇旋轉（rotate)時所產生的雜訊來預測風扇的轉速。然 而’這樣的方法是非常不方便的以及被限制於基於風扇的 201144610 轉速來辨識（_gnize)待被冷卻的物件的溫度。換句話 說，因為風扇的高轉速指示待被冷卻的物件的高溫度，所 以如果使用者不能夠輕易地辨識風扇的轉速，則待被冷卻 的物件的溫度的辨識將受到限制。 【發明内容】 本發明提供-種基於風扇的轉速來改變發光二極體的 色彩的風扇組件，以允許使用者在視覺上檢查（check)風 扇的轉速。 根據本發明的-個觀點，提供了一種基於風扇的轉速 來改變發光二極體的色彩賴扇組件，此風扇組件被用於 $腦或者工業和㈣裝置巾，此風扇組件包括：風扇控制 單元，用於基於脈寬調變（pUlse-width m〇(juiati〇n，pwM) 訊號的工作週期來控制風扇的轉速；風扇，其被連接到風 扇控制單元以便旋轉；發光二極體，用於基於發光控制訊 號來發光；以及發光控制單元，用於基於pWM訊號的工 作週期來生成發光控制訊號以改變發光二極體的色彩。 基於PWM訊號的工作週期可以連續地改變發光二極 體的色彩。 發光一極體可以包括藍色的第一發光二極體、綠色的 第二發光二極體以及紅色的第三發光二極體，以及發光控 制單元可以分別基於第一發光控制訊號至第三發光控制訊 號來控制第一發光二極體至第三發光二極體。 風扇組件還可以包括框（frame)，風扇輕接到此框， 以及發光二極體可以被輕接到此框。 201144610, 框可以包括：底座（seat)，風扇被安裝在此底座上； 外框，圍繞（sumnmd)在風扇的翼片（wing)周圍；以 及橋接S (bridge)，肖於將底座連接到外框，以及發光 一極體可以被安裝在外框或者橋接器上。 以下將參看所附圖示來詳細說明本發明的示例實施 例’從而使得本發_上述及其他的特徵以及優點將更清 楚。 【實施方式】 本發明是有關於一種用於電腦或者工業及家用裝置中 的風扇組件，更具體地說，是有關於—種用於基於風扇的 轉速以改變發光二極體的色彩的風扇組件。 在下文中，藉由參看所附圖示來說明本發明的實施 例’以洋細描述本發明。 請參看圖1和圖2，根據本發明的實施例的風扇组件 100包括風扇控制單元10、風扇20、發光二極體3〇以及 發光控制單元40’以基於脈寬調變（pulse_width m〇dulad〇n， PWM)訊號的工作週期來改變風扇2〇的轉速以及發’ 極體30的色彩。 ,例如，如果電腦的母板（motherboard)的風扇驅動單 基於待被冷卻的物件（例如，晶片組（咖卿））的 溫度來提供PWM訊號，則控制單元1〇基於pWM訊號的 工作週期來控制風扇20的轉速。更具體地說，請參看圖^ 由印刷電路板（printedcircuitb〇ard，pcB)組件丨1以及線 圈經件（coil assembly) 12來形成風扇控制單元1〇，印刷 20114461(^ 電路板組件11具有用於計算PWM訊號的工作週期的演算 法（algorithm)，以及線圈組件12用於藉由控制PC]B組 件 11 來感應（induce)電動勢（eiectromotive force)。在 當前的實施例中’發光二極體30被耦接到PCB組件11。 風扇20被連接到風扇控制單元η以便旋轉。藉由從 線圈組件12所感應的電動勢來旋轉風扇2〇，以及基於 PWM訊號的工作週期來改變風扇20的轉速。 發光控制單元40基於PWM訊號的工作週期以生成發 光控制訊號來改變發光二極體30的色彩，以及發光二極體 30基於發光控制訊號來發光。 在當前的實施例中，發光二極體30包括藍色的第一發 光二極體31、綠色的第二發光二極體32以及紅色的第三 發光二極體33 ^ 藉由第一發光二極體31至第三發光二極體33可以顯 示各種色彩。發光控制單元40生成用於控制第一發光二極 體31的第一發光控制訊號、用於控制第二發光二極體32 的第二發光控制訊號以及用於控制第三發光二極體33的 第三發光控制訊號。 基於PWM訊號的工作週期來生成第一發光控制訊號 至第三發光控制訊號，以及第一發光二極體31至第三發光 二極體33基於第一發光控制訊號至第三發光控制訊號來 依序改變其色彩。也就是說，藉由風扇2〇的旋轉來將第一 發光二極體31至第三發光二極體33的色彩一起混合（相 互干擾（interfere))，從而使用者可以在視覺上檢查各種 6 201144610, JOZ.U^pii 色彩，此各種色彩基於風扇20的轉速而被依序改變。 在當前的實施例中，安裝在電腦的母板上的微電腦 (micom)執行發光控制單元4〇的功能。如果安裝在母板 上的風扇驅動單元70生成以及提供PWM訊號給微電腦， 則微電腦基於PWM訊號的工作週期來生成第一發光控制 Λ说至第二發光控制訊號，以及允許發光二極體發光。 作為替代，風扇控制單元10的PCB組件11可以執行發光 控制單元40的功能。 Χ 請參看圖3 ’基於PWM訊號的工作週期來改變風扇 20的轉速。 〇%的輸出表示風扇20未旋轉，以及100%的輸出表示 風扇20以最大的速度旋轉。因為風扇2〇以對應於基於 PWM訊號的工作週期而事先設定的輸出的速度來旋轉， 所以請參看圖3,風扇20被事先設定為以對應於基於PWM 訊號的工作週期的〇〜3〇%、30〜40%、 40〜65%或者 65〜100%的輸出期間的速度來旋轉。藉由使用者，則可以 任意地改變輸出期間。 根據每一輸出期間來指定（designate)發光二極體30 的色彩。在0〜30%的輸出期間中，發光二極體30的色彩 可以被設置為紅色；在30〜40%的輸出期間中，發光二極 體30的色彩可以被設置為綠色；在40〜65%的輸出期間 中，發光二極體30的色彩可以被設置為藍色；以及在 65〜100%的輸出期間中，發光二極體30的色彩可以被設置 為白色。可以根據每一輸出期間來不同地設置發光二極體 201144610^ 30的色彩。 變遷期間（transition period )(圖3中的陰影部八 (shaded portion))存在於兩個輸出期間之間，在此^201144610 VI. Description of the Invention: This application claims priority to Korean Patent Application No. 20-2010-0003986 filed on Apr. 15, 2010, to the Korean Intellectual Property Office. Combined with this specification. BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a fan assembly for changing the color of a iight-emitting diode based on a rotational speed of a fan, and more particularly, the present invention There is a fan assembly for changing the speed of a fan and the color of a light-emitting diode based on a duty cycle of a pulse-width modulation (PWM) signal to allow a user to visually Check the fan speed. [Prior Art] Fans are used in computers or various industrial and domestic coolers or cooling fans, and pulse width modulation based on fan drive units mounted on a main board (pulse_width modulation) , PWM) signal 'to control the speed of the fan. The fan drive unit provides a PWM signal based on the temperature of the item to be cooled (e.g., the chipset), and the fan control unit controls the speed of the fan based on the duty cycle of the supplied PWM signal. However, a conventional fan assembly capable of adjusting the rotational speed of the fan does not allow the user to easily check the rotational speed of the fan. However, the user can predict the speed of the fan based on the noise generated when the fan is rotated. However, such a method is very inconvenient and is limited to the fan-based 201144610 rotational speed to identify (_gnize) the temperature of the object to be cooled. In other words, since the high rotational speed of the fan indicates the high temperature of the object to be cooled, if the user cannot easily recognize the rotational speed of the fan, the identification of the temperature of the object to be cooled will be limited. SUMMARY OF THE INVENTION The present invention provides a fan assembly that varies the color of a light-emitting diode based on the rotational speed of the fan to allow the user to visually check the rotational speed of the fan. According to an aspect of the present invention, there is provided a color fan assembly for changing a light-emitting diode based on a rotational speed of a fan, the fan assembly being used for a brain or an industrial and (4) device towel, the fan assembly comprising: a fan control unit For controlling the speed of the fan based on the duty cycle of the pulse width modulation (pUlse-width m〇 (juiati〇n, pwM) signal; the fan is connected to the fan control unit for rotation; the light emitting diode is used for The illuminating control unit is configured to generate the illuminating control signal to change the color of the illuminating diode based on the duty cycle of the pWM signal. The duty cycle based on the PWM signal can continuously change the color of the illuminating diode The light emitting body may include a blue first light emitting diode, a green second light emitting diode, and a red third light emitting diode, and the light emitting control unit may be based on the first light emitting control signal to the third The illumination control signal controls the first to third LEDs. The fan assembly may further include a frame, and the fan is lightly connected. The frame, and the light-emitting diode can be lightly connected to the frame. 201144610, the frame can include: a seat on which the fan is mounted; a frame surrounding (sumnmd) around the wing of the fan And bridging S (bridge), connecting the base to the outer frame, and the light emitting body can be mounted on the outer frame or the bridge. Hereinafter, an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings. The above and other features and advantages will be more apparent. [Embodiment] The present invention relates to a fan assembly for use in a computer or industrial and domestic device, and more particularly to A fan assembly based on the rotational speed of the fan to change the color of the light-emitting diode. Hereinafter, the present invention will be described in detail by referring to the accompanying drawings, in which the embodiments of the present invention are described in detail. Referring to FIGS. 1 and 2, The fan assembly 100 of the embodiment of the present invention includes a fan control unit 10, a fan 20, a light emitting diode 3〇, and an illumination control unit 40' to be modulated based on pulse width (pulse_width m〇dulad〇n , PWM) signal duty cycle to change the speed of the fan 2 以及 and the color of the 'polar body 30. For example, if the fan drive of the motherboard of the computer is based on the object to be cooled (for example, the chipset ( The temperature of the coffee)) provides the PWM signal, and the control unit 1 controls the rotation speed of the fan 20 based on the duty cycle of the pWM signal. More specifically, please refer to the figure: printed circuit board (pcB) component丨1 and a coil assembly 12 to form a fan control unit 1〇, printing 20114461 (^ circuit board assembly 11 has an algorithm for calculating the duty cycle of the PWM signal, and the coil assembly 12 is used to borrow The electromotive force is induced by the control PC]B component 11. In the current embodiment, the light emitting diode 30 is coupled to the PCB assembly 11. The fan 20 is connected to the fan control unit η for rotation. The fan 2 is rotated by the electromotive force induced by the coil assembly 12, and the rotational speed of the fan 20 is changed based on the duty cycle of the PWM signal. The illumination control unit 40 changes the color of the LEDs 30 based on the duty cycle of the PWM signal to generate the illumination control signal, and the LEDs 30 emit light based on the illumination control signals. In the current embodiment, the light emitting diode 30 includes a blue first light emitting diode 31, a green second light emitting diode 32, and a red third light emitting diode 33. The polar body 31 to the third light emitting diode 33 can display various colors. The illuminating control unit 40 generates a first illuminating control signal for controlling the first illuminating diode 31, a second illuminating control signal for controlling the second illuminating diode 32, and a third illuminating diode 33 for controlling the third illuminating diode 33. The third illumination control signal. Generating the first illuminating control signal to the third illuminating control signal based on the duty cycle of the PWM signal, and the first illuminating diode 31 to the third illuminating diode 33 are based on the first illuminating control signal to the third illuminating control signal. The order changes its color. That is to say, the colors of the first to third light-emitting diodes 31 to 33 are mixed together by the rotation of the fan 2 (interfering), so that the user can visually check various types of 6 201144610, JOZ.U^pii color, which is sequentially changed based on the rotational speed of the fan 20. In the current embodiment, a microcomputer (micom) mounted on the motherboard of the computer performs the function of the illumination control unit 4. If the fan driving unit 70 mounted on the motherboard generates and supplies a PWM signal to the microcomputer, the microcomputer generates a first lighting control to the second lighting control signal based on the duty cycle of the PWM signal, and allows the LED to emit light. Alternatively, the PCB assembly 11 of the fan control unit 10 can perform the functions of the illumination control unit 40. Χ Refer to Figure 3 for the PWM signal-based duty cycle to change the speed of the fan 20. The output of 〇% indicates that the fan 20 is not rotating, and the output of 100% indicates that the fan 20 is rotating at the maximum speed. Since the fan 2 旋转 rotates at a speed corresponding to the output set in advance based on the PWM signal-based duty cycle, referring to FIG. 3, the fan 20 is previously set to correspond to the duty cycle of the PWM signal-based 〇~3〇% , 30 to 40%, 40 to 65%, or 65 to 100% of the output during the rotation of the speed. With the user, the output period can be arbitrarily changed. The color of the light-emitting diode 30 is designed according to each output period. In the output period of 0 to 30%, the color of the light-emitting diode 30 can be set to red; in the output period of 30 to 40%, the color of the light-emitting diode 30 can be set to green; at 40 to 65 In the output period of %, the color of the light-emitting diode 30 can be set to blue; and in the output period of 65 to 100%, the color of the light-emitting diode 30 can be set to white. The color of the light-emitting diode 201144610^30 can be set differently according to each output period. The transition period (shaded portion in Figure 3) exists between the two output periods, where ^
間中’連續地改變發光二極體3〇的色彩。例如，在紅色= 出期間以及綠色輸出期間之間的28〜31%的變遷期間中/ 發光二極體30的色彩逐漸地從紅色變為紅色和綠色之間 的中間色彩，接著變為綠色。 B 例如，在紅色的輸出期間中，發光控制單元4 〇生成第 一發光控制訊號以及第二發光控制訊號以關閉（turn 〇ff) 第一發光二極體31以及第二發光二極體32，以及提供第 三發光控制訊號給第三發光二極體33以開啟（turn 〇n )第 二發光二極體33，從而實現紅光。在紅色和綠色的中間色 彩的變遷期間中，發光控制單元4 〇生成第一發光控制訊號 以關閉第一發光二極體31，以及生成第二發光控制訊號和 第二發光控制訊號以開啟第二發光二極體32以及第三發 光二極體33。在這種情況下，為了連續改變色彩，被施加 到第二發光二極體32的電流被逐漸地增加，被施加到第三 發光二極體33的電流被逐漸地減小，以及如果開始綠色的 輸出期間’貝彳輸出用於關閉第三發光二極體Μ的第三發光 控制sfl號以及用於開啟第二發光二極體32的第二發光控 制訊號，從而實現綠光。 猶如紅色被改變為綠色的變遷期間，在綠色被改變為 藍色以及藍色被改變為白色的變遷期間中，發光二極體3〇 的色彩也連續地被改變。 8 201144610, JOZ,VZ,pll 風扇組件100還包括框50,風扇20被耦接到此框50。 如圖1所示，框50包括底座51、外框52以及橋接器 53 ° 風扇20以及PCB組件11被安裝在底座51上。PCB 組件11藉由旋轉轴（rotation shaft ) 51a而被串起 (skewer )，旋轉轴51a從底座51可旋轉地伸出 (protrude)，以及風扇20的中心部分被耦接到旋轉軸51a。 外框52圍繞在風扇的翼片周圍，以及橋接器53將外 框52連接到底座51。框50的形狀可以進行各種改變。可 以不包括外框52，以及也可以不包括橋接器53。 同時’圖4是根據本發明的另一實施例的框5〇的後透 視圖。如圖4所示，在當前的實施例中，發光二極體3〇 被耦接到外框52。被耦接到外框52的發光二極體3〇經由 電線60而被連接到外部電源，以及電線6〇沿著形成於橋 接器53中的引導凹槽（gUide groove) 53a而延伸（extend ) 以及施加電流給發光二極體30。在本實施例中，儘管發光 二極體30被耦接到外框52，然而作為替代，發光二極體 30可以被耦接到橋接器53。 因為風扇20成螺旋形地（Spiraiiy)延伸，所以風扇 2〇的翼片之間的距離從風扇20的中心部分朝風扇的邊緣 增加。如果發光二極體30被耦接到橋接器53或者外框 52，相較於發光二極體30被耦接到風扇2〇的中心部分附 近的情況’風扇2G的翼片之間所發射的光線的數量增加， 從而更大數量的光線可以被提供給使用者。 201144610 下面將詳細描述風扇組件1〇〇的操作。 如果安裝在電腦的母板上的風扇驅動單元7〇生成 PWM訊號’則PWM訊號被輸入到風扇控制單元1〇，以 及風扇控制單元10基於PWM訊號的工作週期來控制風扇 20的轉速。同時，pWM訊號被輸入到發光控制單元4〇， 以及發光控制單元40基於PWM訊號的工作週期來生成第 一發光控制訊號至第三發光控制訊號，以及選擇性地開啟 或者關閉第一發光二極體31至第三發光二極體33。在這 種情況下，被施加到第一發光二極體3丨至第三發光二極體 33的電流被第一發光控制訊號至第三發光控制訊號來控 制，以及第一發光二極體31至第三發光二極體幻所發射 的光線的色彩被連續地改變。 從而，藉由採用發光二極體30的色彩，用於基於風扇 20的轉速來改變發光二極體3〇的色彩的風扇組件1〇〇可 以使得風扇20的轉速看得見，從而可以在視覺上檢查待被 冷卻的元件的溫度以及風扇2〇的轉速。 如上所述’根據本發明，因為風扇組件可以基於風扇 的轉速來改變發光二極體的色彩，所以使用者可以在視覺 上檢查風扇的轉速。 雖然本發明已以較佳實施例揭露如上，然其並非用以 限定本發明’任何熟習此技藝者，在不脫離本發明之精神 ^範圍内，當可作些許之更動與潤飾，因此本發明之保護 範圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 201144610 圖1是根據本發明的實施例的風扇組件的分解透視圖 (exploded perspective view ) 〇 圖2是風扇組件的方塊圖。 圖3是根據風扇組件的轉速來改變發光二極體的色彩 的示例的圖形。 圖4是根據本發明的另一實施例的風扇組件的後透視 圖(rear perspective view ) ° 【主要構件符號說明】 100 :風扇組件 10 :風扇控制單元 11 :印刷電路板組件 12 ·線圈組件 20 .風扇 30 :發光二極體 40:發光控制單元 31 :藍色的第一發光二極體 32 :綠色的第二發光二極體 33 ··紅色的第三發光二極體 50 :框 51 :底座 51a :旋轉轴 52 :外框 53 :橋接器 53a :引導凹槽 60 :電線 70 _風扇驅動單元In between, 'continuously changes the color of the light-emitting diode 3〇. For example, in the transition period of 28 to 31% between the red = out period and the green output period / the color of the light-emitting diode 30 gradually changes from red to an intermediate color between red and green, and then changes to green. For example, in the red output period, the illumination control unit 4 generates a first illumination control signal and a second illumination control signal to turn off the first LED 13 and the second LED 32, And providing a third light-emitting control signal to the third light-emitting diode 33 to turn on the second light-emitting diode 33, thereby realizing red light. During the transition period of the intermediate color of red and green, the illumination control unit 4 generates a first illumination control signal to turn off the first LED 201, and generates a second illumination control signal and a second illumination control signal to enable the second The light emitting diode 32 and the third light emitting diode 33 are provided. In this case, in order to continuously change the color, the current applied to the second light-emitting diode 32 is gradually increased, the current applied to the third light-emitting diode 33 is gradually decreased, and if green is started During the output period, the Bellow output is used to turn off the third light-emitting diode sfl of the third light-emitting diode and the second light-emitting control signal for turning on the second light-emitting diode 32, thereby realizing green light. The color of the light-emitting diode 3〇 is continuously changed during the transition period in which the green color is changed to blue and the blue color is changed to white during the transition period in which the red color is changed to green. 8 201144610, JOZ, VZ, pll The fan assembly 100 further includes a frame 50 to which the fan 20 is coupled. As shown in FIG. 1, the frame 50 includes a base 51, an outer frame 52, and a bridge 53. The fan 20 and the PCB assembly 11 are mounted on the base 51. The PCB assembly 11 is skewed by a rotation shaft 51a which is rotatably protruded from the base 51, and a central portion of the fan 20 is coupled to the rotating shaft 51a. The outer frame 52 surrounds the fins of the fan, and the bridge 53 connects the outer frame 52 to the base 51. The shape of the frame 50 can be variously changed. The outer frame 52 may not be included, and the bridge 53 may not be included. Meanwhile, Fig. 4 is a rear perspective view of a frame 5〇 according to another embodiment of the present invention. As shown in FIG. 4, in the current embodiment, the light emitting diodes 3'' are coupled to the outer frame 52. The light emitting diode 3 被 coupled to the outer frame 52 is connected to an external power source via a wire 60, and the wire 6 延伸 extends along a gUide groove 53a formed in the bridge 53. And applying a current to the light emitting diode 30. In the present embodiment, although the light emitting diode 30 is coupled to the outer frame 52, the light emitting diode 30 may be coupled to the bridge 53 instead. Since the fan 20 extends in a spiral (Spiraiiy), the distance between the fins of the fan 2 turns from the central portion of the fan 20 toward the edge of the fan. If the light emitting diode 30 is coupled to the bridge 53 or the outer frame 52, as compared with the case where the light emitting diode 30 is coupled to the vicinity of the center portion of the fan 2', the fan 2G is emitted between the fins The amount of light is increased so that a greater amount of light can be provided to the user. 201144610 The operation of the fan assembly 1A will be described in detail below. If the fan driving unit 7A mounted on the motherboard of the computer generates the PWM signal ', the PWM signal is input to the fan control unit 1', and the fan control unit 10 controls the rotation speed of the fan 20 based on the duty cycle of the PWM signal. At the same time, the pWM signal is input to the illumination control unit 4, and the illumination control unit 40 generates the first illumination control signal to the third illumination control signal based on the duty cycle of the PWM signal, and selectively turns the first illumination diode on or off. The body 31 to the third light emitting diode 33. In this case, the current applied to the first to third light-emitting diodes 3 to 33 is controlled by the first to third illumination control signals, and the first light-emitting diode 31. The color of the light emitted by the third light-emitting diode is continuously changed. Thus, by employing the color of the light-emitting diode 30, the fan assembly 1 for changing the color of the light-emitting diodes 3 based on the rotational speed of the fan 20 can make the rotational speed of the fan 20 visible, thereby enabling visual The temperature of the component to be cooled and the rotational speed of the fan 2〇 are checked. As described above, according to the present invention, since the fan assembly can change the color of the light-emitting diode based on the rotational speed of the fan, the user can visually check the rotational speed of the fan. Although the present invention has been disclosed in the above preferred embodiments, the present invention is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS 201144610 FIG. 1 is an exploded perspective view of a fan assembly according to an embodiment of the present invention. FIG. 2 is a block diagram of a fan assembly. Fig. 3 is a diagram showing an example of changing the color of the light-emitting diode in accordance with the rotational speed of the fan assembly. 4 is a rear perspective view of a fan assembly according to another embodiment of the present invention. [Main component symbol description] 100: Fan assembly 10: Fan control unit 11: Printed circuit board assembly 12 • Coil assembly 20 Fan 30: Light-emitting diode 40: Light-emitting control unit 31: Blue first light-emitting diode 32: Green second light-emitting diode 33··Red third light-emitting diode 50: Box 51: Base 51a: rotating shaft 52: outer frame 53: bridge 53a: guiding groove 60: wire 70 _ fan driving unit