200901823 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種照明裝置，特別關於一種以發光二 極體為光源之照明裝置。 【先前技術】 現代科技曰新月異，相對於生活水準亦大為提升，而 人們對於物質的要求亦越來越高，故對於生活周邊所需物 品的功能性及美觀，亦要求更多。而照明裝置亦不例外， 幾乎成為生活中不可或缺的重要一項，像是利用照明裝置 來美化環境或提升生活情調。因此，使用者對於照明裝置 之功能、實用及外觀需求，亦相對提高。 如今，照明裝置已被廣泛使用於生活中，例如學校、 辦公室、商場、工廠大廳等場所之照明，或家庭之必需或 裝潢之照明。照明裝置不但為黑暗帶來了光明，也替生活 帶來了多彩多姿的變化。 請參照圖1所示，係為習知照明裝置1之一結構示意 圖。照明裝置1主要包含一底座11、一支撐架12及一照 明單元13，支撐架12設置於底座11上，照明單元13固 定於支撐架12上。其中，照明單元13具有一燈管131以 及一燈罩132，燈管131可提供照明時所需之光線，燈罩 132則覆蓋並保護燈管131，使燈管131所發出的光線往 下發射。底座11具有一開關111及一旋鈕112，開關111 與一外部電源傳輸線14電性連接，以控制燈管131之亮 5 200901823 暗。旋鈕112經由設置於支撐架12中之一電-源傳輸線121 與照明單元13中之燈管131電性連接，並經由控制流經 電源傳輸線121中之電流量來控制燈管131所發出之光線 的亮度大小。 然而，利用旋鈕112來調控照明裝置1之亮度，不僅 只可大略地調整亮度，更不符合現今消費者求新求變的需 求。 因此，如何提供一種可依據不同需求，而自動調整光 線之強度之照明裝置，實為重要課題之一。 【發明内容】 有鑑於上述課題，本發明之目的為提供一種可依據不 同需求，而自動調整光線之強度之照明裝置。 緣是，為達上述目的，依本發明之一種照明裝置係包 含一照明單元、一第一感測單元以及一驅動控制單元。照 明單元係具有複數個發光二極體並發出一光線，第一感測 單元係相對照明單元設置，以感測光線之強度，並產生一 第一感測訊號，驅動控制單元係具有一控制器與一光線強 度對照表，控制器係接收第一感測訊號，並依據光線強度 對照表發出一控制訊號至照明單元，照明單元係依據控制 訊號以調整光線之強度。 承上所述，因依本發明之照明裝置中，照明單元之複 數個發光二極體所發出之光線，係藉由第一感測單元相對 照明單元設置，來感測光線之強度而產生第一感測訊號。 6 200901823 而驅動H彳單元之控制^則接收第―❹彳訊號，以依據光 =強度對照表發出控制訊號至照明單&，以言周整發光二極 體所發出之光線強度。與習知技術相較，本發明係利用第 —感測單元及驅動控制單元之光線強度對照表，以藉由第 —感測單元隨時感測光線的強度，並藉由光線強度對照表 ，出控制訊號。此種方式’不僅使得照明裝置可依據不同 $求來與光線強度對照表相配合，以自動調整光線至適 當強度’照明裝置更能自行調整光線的強度，故進而 照明裝置之產品品質。 【實施方式】 以下將芩照相關圖式，說明依本發明較佳實施例之一 種照明裝置。 ' 晴餐照圖2所示，本發明較佳實施例之照明裝置之係 有照明單元21、—第—感測單元22以及-驅動控制 單-力3此外，照明裝置2更包含一座體24以及一可調 支撐，25。本實施例之照喊置2之料並無限制，在此 ㈣㈣裝置2為—檯燈為例。而照明褒置2係可藉由-電源傳輸線26以接收-供應電源（圖中未示）。 、，一…明單70 21係具有複數個發光二極體211，並藉由發 t極體211以發出一光線。此外光二極體211係可 為一紅光、—綠光或一藍光之發光二極體211，當缺更可 依據不同需求而同時使用紅光、綠光及藍光之發光二極體 211 ’以混合發以光或其他混合的光線顏色。 200901823 第一感測單元22係包含一光感測器（photo sensor)或 —影像感測元件，例如一電輕合(Charge Coupled Device， CCD)影像感測器或一互補性氧化金屬半體 (Complementary Metal-Oxide Semiconductor，CMOS)影像 感測器。第一感測單元22係相對照明單元21設置，意即 第一感測單元22係設置於座體24上，當然其亦可設置於 照!!單元21之一側，例如為書桌或外界環境上。第一感 、J單元22係可藉由光感測器或影像感測元件以感測照明 置开 Ο 1 所發出之光線的強度，並轉換產生一第一感測訊 元21啦控制單元23係分別與第一感測單元22及照明單 表（圖生連接，並具有一控制器231及一光線強度對照 第一感^卢控制器231係接收第一感測訊號S1，並依據 度，而轉才〜Sl至光線強度對照表中查出所對照的強 有廠商内t發出一控制訊號S2。光線強度對照表則可記錄 係。此外欠之適當的光線強度與感測訊號S1之對照關 驅動晶片㈤驅動控制單元23更可具有一電路板232或- 2 3 2為例未不）’在此係以驅動控制單元2 3具有電路板 上，而故於實施上，控制器231係設置於電路板232 中之驅動^度對照表則儲存於電路板232中。本實施例 24或照明:制單7^ 23 ’其設置位置於實施上可設置於座體 於座體24^7° 21之一側’在此係以驅動控制單元23設置 為例（如圖2與圖3所示）。 元21接收控制訊號S2後，則會依據控制訊 8 200901823 號S2，來調整光線至適當之強度。 於本實施例中，座體24係相對照明單元2 可調找㈣則分別與座體24及照明單元Μ連接， 於貫^上可精由可調支撐架25來調整座體24盘昭明單元 斤加M W 離d愈小，職示可調支 之長度愈短，使得座體24與照明單元21愈靠 圖2所示），·相對距離〇 〜 （如 度命長，使得可調支撐架25之長 又^使传座體24與照明單元21愈遠離(如圖3 此外，裳置2更具有一第二感測單元”，係盘 驅動控制單元23電性遠拉，# 〜、 連接並感測一移動熱源Ml，以產 Μ至驅動控制單元23之控制器加， _ 依據第二感測訊號S3以開啟或關閉照明單 =施例之第二感測單元27係可設置於照明單元 為::：弟一感測單元22，且於實施上第二感測單元27 可藉由人體的接近;::=器。如此-來，使用者即 戈、、例如手部），而造成第二咸 感測到溫度的上升而發& $ _ " 照明單元2i。 感測訊號S3，以·或關閉 另夕卜’請參照圖4所示’照明裝置2更具有—第三感 產：：斤-而第二感測單元28用以感測-移動物體M2' 產生一弟二感測訊號S4至 - 如，而控制器231係依據= 動控制早兀23之控制器 照明單以。本實::::二感測訊號S4以開啟或關閉 一影像感測元件，^ ^三人^單元28於實施上係為 電輕合影像感測器一互補性氧化 200901823 金屬半體影像感測器或者為一紅外線發射及感測組件。而 第二感測單元28之設置位置並無限制，係可鄰設於照明 單元21 (如圖4所示）或設置於座體24上（圖未示）。如此一 來’使用者即可藉由物件的揮動，進㈣發第三感測單元 28產生第三感測訊號S4，以開啟或關閉照明單元灯。 請參照圖5所示，照明裝置2更具有一第四感測單元 29,第四感測單元29係與第三感測單元“相對而設，於 實施上第三感測單元28係鄰設第一感測單元Μ，第四感 測單元29係設置於照明單元21。而第三感測單a 28與第 四感測單元2 9係可為一紅外線感測器⑽組件，以分別做 為-紅外線接收器及一紅外線發射器，意即第三感測單元 28接收紅外線’第四感測單元29發射紅外線。當有移動 物體^於第三感測單元28及第四感測單元29之間時，則 因第三感測單元28無法接收紅外線，而產生第三感測部 號S 4至控制器2 31 ’以控制照明單元2}開啟或關閉。 為使本發明的内容更加清楚，以τ 說明依本發職佳實施例之照縣置2之 = 並以照明裝置2為一檯燈為例。 在此 睛同時參照圖2盥圖3m上 置2時，❹者可料U *使用者欲使用照明裝 便用者了將手軸至㈣裝置2之照 與座體24之間，此時照明裝- 測到傕用去的之弟一感測早兀27係感 成1幻便用者的手的熱源，即 測邙轳S3 τ β & 秒動…原Ml，而產生第二感 测讯號S3送至驅動控制單元23 231 ^ - rf ^ar 徑制器231，而控制器 據第—感測訊號S3而開啟照明單it 21，意即控 200901823 制态231係驅動照明單亓 兀21之複數個發光二極體211，而 使發光二極體211發出一本 - 91 ΟΑ 先線。而§手再次移動至照明單 兀21與座體24之間時 _ 千 則弟一感測早兀27係再次感測 使用者的手之熱源而亦產座贫一 產生第一感測訊號S3至控制哭 231 ’以關閉照明單元21。 利°0 另外’照明裝置2之先结雄择总 九線強度係會自行調整。藉由第 一感測早元22來感測光蠄 a』亢線之強度，而產生第一 S1至驅動控制單元23之押 α、】訊唬 , A <徑制益231，則控制器231係依 據光線強度對照表而發出控龍號S2至照料元Μ，使 照明單元21會自行依據控制訊號82而自動調整光線之強 度。 另外，當使用者想自行調整照明單元21之光線之強 度，則可藉由調整可調支撐架25之長度，而使得昭 兀21與座體24相對距離d縮短，以增加照明裝置2之光 線之強度（如圖2所示）。200901823 IX. Description of the Invention: [Technical Field] The present invention relates to a lighting device, and more particularly to a lighting device using a light emitting diode as a light source. [Prior Art] Modern technology is changing with each passing day, and its living standards are greatly improved. People's requirements for materials are getting higher and higher, so more demands are placed on the functionality and aesthetics of the items around life. Illumination devices are no exception, and they are almost an indispensable part of life, such as using lighting devices to beautify the environment or enhance the mood of life. Therefore, the user's demand for the function, utility and appearance of the lighting device is relatively increased. Today, lighting fixtures have been widely used in life, such as lighting in places such as schools, offices, shopping malls, factory halls, or lighting that is necessary or decorated by the home. Lighting fixtures not only bring light to the dark, but also bring about a multitude of changes in life. Referring to Fig. 1, there is shown a schematic structural view of a conventional lighting device 1. The illuminating device 1 mainly includes a base 11, a support frame 12 and an illumination unit 13. The support frame 12 is disposed on the base 11, and the illumination unit 13 is fixed on the support frame 12. The lighting unit 13 has a light tube 131 and a light cover 132. The light tube 131 can provide light required for illumination, and the light cover 132 covers and protects the light tube 131, so that the light emitted by the light tube 131 is emitted downward. The base 11 has a switch 111 and a knob 112. The switch 111 is electrically connected to an external power transmission line 14 to control the brightness of the lamp 131. The knob 112 is electrically connected to the lamp 131 in the illumination unit 13 via an electric-source transmission line 121 disposed in the support frame 12, and controls the light emitted by the lamp 131 by controlling the amount of current flowing through the power transmission line 121. The brightness level. However, the use of the knob 112 to regulate the brightness of the illumination device 1 not only greatly adjusts the brightness, but also does not meet the needs of today's consumers for new demands. Therefore, how to provide an illumination device that can automatically adjust the intensity of the light according to different needs is one of the important topics. SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an illumination device that can automatically adjust the intensity of light according to different needs. In order to achieve the above object, a lighting device according to the present invention comprises a lighting unit, a first sensing unit and a driving control unit. The lighting unit has a plurality of light emitting diodes and emits a light. The first sensing unit is disposed relative to the lighting unit to sense the intensity of the light and generate a first sensing signal. The driving control unit has a controller. And a light intensity comparison table, the controller receives the first sensing signal, and sends a control signal to the lighting unit according to the light intensity comparison table, and the lighting unit adjusts the intensity of the light according to the control signal. According to the invention, in the illumination device according to the present invention, the light emitted by the plurality of light-emitting diodes of the illumination unit is generated by the first sensing unit being disposed opposite to the illumination unit to sense the intensity of the light. A sensing signal. 6 200901823 The control that drives the H彳 unit receives the first signal to send a control signal to the illumination sheet & according to the light=intensity comparison table to indicate the intensity of the light emitted by the LED. Compared with the prior art, the present invention utilizes the light intensity comparison table of the first sensing unit and the driving control unit to sense the intensity of the light at any time by the first sensing unit, and the light intensity comparison table is used. Control signal. In this way, not only can the lighting device cooperate with the light intensity comparison table according to different requirements, but also automatically adjust the light to the appropriate intensity. The lighting device can adjust the intensity of the light by itself, and thus the product quality of the lighting device. [Embodiment] Hereinafter, a lighting device according to a preferred embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 2, the illumination device of the preferred embodiment of the present invention is provided with a lighting unit 21, a first sensing unit 22, and a driving control unit-force 3. In addition, the lighting device 2 further includes a body 24. And an adjustable support, 25. There is no limitation on the material of the screaming setting 2 in this embodiment. Here, (4) (4) the device 2 is a table lamp as an example. The illumination device 2 can be connected to the power supply (not shown) by the power transmission line 26. , a ... single sheet 70 21 has a plurality of light-emitting diodes 211, and emits a light by emitting a body 211. In addition, the photodiode 211 can be a red, green, or blue light emitting diode 211, and the red, green, and blue light emitting diodes 211 ′ can be simultaneously used according to different needs. Mix light with light or other mixed light colors. 200901823 The first sensing unit 22 includes a photo sensor or an image sensing component, such as a Charge Coupled Device (CCD) image sensor or a complementary oxidized metal half ( Complementary Metal-Oxide Semiconductor, CMOS) image sensor. The first sensing unit 22 is disposed opposite to the lighting unit 21, that is, the first sensing unit 22 is disposed on the base 24, and of course, it may be disposed on one side of the camera unit 21, such as a desk or an external environment. on. The first sense, the J unit 22 can sense the intensity of the light emitted by the illumination opening 藉 1 by the light sensor or the image sensing element, and convert and generate a first sensing element 21 to control the unit 23 The first sensing unit is connected to the first sensing unit 22 and the illumination unit, and has a controller 231 and a light intensity control first sensing unit 231 for receiving the first sensing signal S1, and according to the degree, In the comparison to the light intensity comparison table, the strong control manufacturer in the light intensity comparison table sends out a control signal S2. The light intensity comparison table can record the system. In addition, the appropriate light intensity is compared with the sensing signal S1. The driving control unit (5) may further have a circuit board 232 or - 2 3 2 as an example. Here, the driving control unit 23 has a circuit board, and thus, the controller 231 is implemented. The drive comparison table disposed in the circuit board 232 is stored in the circuit board 232. The embodiment 24 or the illumination: the manufacturing unit 7^23' can be disposed on the one side of the seat body 24^7° 21 in the implementation. Here, the drive control unit 23 is set as an example (as shown in the figure). 2 and Figure 3). After receiving the control signal S2, the element 21 adjusts the light to the appropriate intensity according to S2 of Control Signal No. 200901823. In this embodiment, the base body 24 is adjustable relative to the lighting unit 2 (four), and is respectively connected to the seat body 24 and the lighting unit ,, and the adjustable support frame 25 can be used to adjust the seat body 24 The smaller the jin plus MW is, the shorter the length of the job display can be adjusted, so that the seat body 24 and the lighting unit 21 are closer to the figure shown in Fig. 2, the relative distance 〇~ (such as the length of life, so that the adjustable support frame The length of 25 and the distance between the transmitting body 24 and the lighting unit 21 (as shown in Fig. 3, the skirt 2 has a second sensing unit), the disk drive control unit 23 is electrically pulled, #~, connected And sensing a mobile heat source M1 to produce a controller to the drive control unit 23, _ according to the second sensing signal S3 to turn on or off the illumination unit. The second sensing unit 27 can be set in the illumination. The unit is::: the first sensing unit 22, and in the implementation, the second sensing unit 27 can be accessed by the human body;::=. Thus, the user is the user, for example, the hand) Causes the second salty sense to detect a rise in temperature and sends & $ _ " lighting unit 2i. Sensing signal S3, to or off another ' Referring to FIG. 4, the illuminating device 2 further has a third sensing product: the jins-the second sensing unit 28 is configured to sense the moving object M2' to generate a second sensing signal S4 to - The controller 231 is based on the controller lighting control of the control unit 23. The actual:::: two sensing signals S4 to turn on or off an image sensing component, ^ ^ three ^ unit 28 in the implementation system A complementary oxidation 200901823 metal half-body image sensor or an infrared emission and sensing component for the electric light-sensing image sensor, and the second sensing unit 28 is disposed at a position that is adjacent to the illumination. The unit 21 (shown in FIG. 4) or is disposed on the base 24 (not shown). Thus, the user can generate a third sensing by the third sensing unit 28 by the waving of the object. The signal S4 is used to turn on or off the illumination unit lamp. Referring to FIG. 5, the illumination device 2 further has a fourth sensing unit 29, and the fourth sensing unit 29 is opposite to the third sensing unit. The third sensing unit 28 is disposed adjacent to the first sensing unit Μ, and the fourth sensing unit 29 is disposed on the illumination sheet. 21. The third sensing unit a 28 and the fourth sensing unit 29 can be an infrared sensor (10) component, respectively, as an infrared receiver and an infrared emitter, that is, a third sensing unit. The fourth sensing unit 29 emits infrared rays. When there is a moving object between the third sensing unit 28 and the fourth sensing unit 29, the third sensing unit 28 cannot receive infrared rays. The third sensing part number S 4 to the controller 2 31 'is turned on or off by controlling the lighting unit 2}. To make the content of the present invention clearer, the τ description is based on the preferred embodiment of the present invention. Take the lighting device 2 as a lamp as an example. When the eye is simultaneously placed with reference to FIG. 2 and FIG. 3m, the user can use the lighting device to connect the hand shaft to the (4) device 2 and the seat body 24 at this time.装- 测 测 的 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀The signal S3 is sent to the drive control unit 23 231 ^ - rf ^ ar 231, and the controller turns on the illumination unit it 21 according to the first sensing signal S3, which means that the control unit 2009 231 is driving the illumination unit. A plurality of light-emitting diodes 211 of 21, and the light-emitting diode 211 emits a -91 ΟΑ first line. And when the hand moves again between the illumination unit 21 and the body 24, _ thousand brothers feel that the early 27th system senses the heat source of the user's hand again and also produces a first sensing signal S3. To control the cry 231 ' to turn off the lighting unit 21. In addition, the first nine-line strength system of the lighting device 2 will adjust itself. The intensity of the pupil 亢 亢 line is sensed by the first sensing early element 22, and the first S1 to the drive control unit 23 is generated, and the controller 231 is generated. According to the light intensity comparison table, the control number S2 is sent to the care element Μ, so that the illumination unit 21 automatically adjusts the intensity of the light according to the control signal 82. In addition, when the user wants to adjust the intensity of the light of the illumination unit 21, the length of the adjustable support frame 25 can be adjusted to shorten the relative distance d between the camera 21 and the seat body 24 to increase the light of the illumination device 2. The intensity (as shown in Figure 2).
又使用者欲減弱照明單元21之光線的強度’則可調 整可調支#架25之長度，使得座體24與㈣單元21之 相對距離D增加（如圖3所示）。 由於本實關之㈣單元21係可藉由第—感測單元 22以感測照明單元21之紐之強度，並產生第1感測訊 號si，而藉由驅動控制單元23之控制器231，以依據光 線強度對照表發出控制訊號S2至照明單元21，以自動調 整光線之強度，進而提升照明裝置2之品質。此外，本每 施例之照明裝置2更可藉由第二感測單元27，或第三感二 11 200901823 xrcr _ l二::二四感測單元29感測移動熱源M1或移動物 乂作為開啟或關閉照明單元21之用余- 數個^所逑，因依本發明之照明裝置^照明單元之複 體所發出之光線，係藉由第-感測單元相對 …月早㈣置’來感測光線之強度而產生第 而驅動控制單元之控制器則接 "* 、 2 感測訊號，以依據光 體‘” 號至照明單S ’以調整發光二極 二感^ m之、線強度。與習知技術相較，本發明係利用第 -驅動控制單元之光線強度對照表，以藉由第 感測光線的強度，並藉由光線強度對照表 :工广。此種方式’不僅使得照明裝置可依據不同 =痒來與光線強度對照表相配合，以自動調整光線至適 虽強度’照明裝置更能自行調整光線的強度，故進而提升 照明裝置之產品品質。 以上所述僅為舉例性’而非為限制性者。任何未脫離 本發明之精神與㈣，㈣其進行之等效修改或變更，均 應包含於後附之申請專利範圍中。 【圖式簡單說明】 圖1為顯示習知之一種照明裝置之結構示意圖； 圖2為顯示依本發明較佳實施例之一種照明裝置，係 座體與照明單元的相對距離較小之示意圖； 圖3為顯示依本發明較佳實施例之照明裝置，係座體 與照明單元的相對距離較大之示意圖； — 12 200901823 圖4為顯示依本發明較佳實施例之照明裝置，係具有 第三感測單元之示意圖；以及 圖5為顯示依本發明較佳實施例之照明裝置，係具有 第三感測單元及第四感測單元之示意圖。 【主要元件符號說明】 I :檯燈 II :底座 111:開關 112 :旋鈕 12 :支撐架 121、26 :電源傳輸線 13、21 :照明單元 131 :燈管 132 :燈罩 14 :外部電源傳輸線 1 2 :照明裝置 211 :發光二極體 22 :第一感測單元 23 :驅動控制單元 -231:控制器 .232 :電路板 24 :座體 25 :可調支撐架 13 200901823 27 第二感測單元 28 第三感測單元 29 第四感測單元 d、 D :相對距離 Ml :移動熱源 M2 :移動物體 SI :第一感測訊號 S2 :控制訊號 S3 :第二感測訊號 S4 :第三感測訊號Further, the user wants to reduce the intensity of the light of the illumination unit 21, and the length of the adjustable support frame 25 is adjusted so that the relative distance D between the base 24 and the (4) unit 21 is increased (as shown in Fig. 3). Since the (4) unit 21 of the present embodiment can sense the intensity of the illumination unit 21 by the first sensing unit 22 and generate the first sensing signal si, by driving the controller 231 of the control unit 23, The control signal S2 is sent to the illumination unit 21 according to the light intensity comparison table to automatically adjust the intensity of the light, thereby improving the quality of the illumination device 2. In addition, the illuminating device 2 of the present embodiment can further sense the moving heat source M1 or the moving object by the second sensing unit 27, or the third sensation 11 200901823 xrcr _ l:: 24 sensing unit 29 Turning on or off the use of the lighting unit 21 - a plurality of lights, the light emitted by the illuminating unit of the lighting device according to the present invention is made by the first sensing unit relative to the early (four) Sensing the intensity of the light to generate the first controller of the driving control unit is connected to the "*, 2 sensing signal, according to the light body '" to the lighting sheet S' to adjust the line of the two-pole two sense Intensity. Compared with the prior art, the present invention utilizes the light intensity comparison table of the first-drive control unit to sense the intensity of the light by the first, and by means of the light intensity comparison table: The lighting device can be matched with the light intensity comparison table according to different = itching to automatically adjust the light to the appropriate intensity. The lighting device can adjust the intensity of the light by itself, thereby improving the product quality of the lighting device. Illustrative 'not limited Any changes or modifications that do not depart from the spirit of the invention and (4), (4) shall be included in the scope of the appended claims. [Simplified Schematic] Figure 1 shows a conventional illumination 2 is a schematic view showing a lighting device according to a preferred embodiment of the present invention, wherein the relative distance between the base and the lighting unit is small; and FIG. 3 is a view showing a lighting device according to a preferred embodiment of the present invention. FIG. 4 is a schematic view showing a lighting device according to a preferred embodiment of the present invention, having a third sensing unit; and FIG. 5 is a view showing the invention according to the present invention; The illumination device of the preferred embodiment has a schematic diagram of a third sensing unit and a fourth sensing unit. [Main component symbol description] I: Table lamp II: Base 111: Switch 112: Knob 12: Support frames 121, 26: Power transmission line 13, 21: illumination unit 131: lamp tube 132: lamp cover 14: external power transmission line 1 2: illumination device 211: light-emitting diode 22: first sensing unit 23: drive control unit-23 1: Controller. 232: Circuit board 24: Seat 25: Adjustable support frame 13 200901823 27 Second sensing unit 28 Third sensing unit 29 Fourth sensing unit d, D: Relative distance M1: Moving heat source M2 : moving object SI: first sensing signal S2: control signal S3: second sensing signal S4: third sensing signal