baber/WOPTO huggingface dataset:
Patent KR-20010083417-A (KR)
Title: Method for the preparation of 2,3,5-trimethylbenzoquinone
Inventor: KOO BON CHEOL
IPC: C07C46/02
Filed: 2000-02-12
Abstract: PURPOSE: A method for preparing 2,3,5-trimethyl benzoquinone is provided to enable the mass production of the composition in high purity and yield by employing commonly and economically used oxidizing agent and catalyst. CONSTITUTION: The method comprises reacting 2,3,5-trimethylphenol of the formula(1) or 2,3,6-trimethylphenol of the formula(2) to produce 2,3,5-trimethyl benzoquinone of the formula(3) in the presence of boron compound as an oxidizing catalyst and other solvent at 10-100 deg.C. The oxidizing catalyst is hydrogen peroxide or tert-hydrogen butyl peroxide in an amount of 1-50 mole in terms of chemical equivalent based on total moles of 2,3,5- or 2,3,6-trimethylphenols. The boron compound is boronic acid or boron oxide and the solvent is at least one acidic solvent selected from a group consisting of acetic acid, formic acid, phosphoric acid and oxalic acid.
Patent KR-20000062593-A (KR)
Title: 배선층을 갖는 기판 및 그 제조방법
IPC: H01L21/60
Filed: 2000-02-22
Abstract: 절연성기판 (11) 의 양면에 배선층 (12a ∼ 12d) 을 형성한 후, 펀칭프레스에 의해 상기 양배선층 (12a 와 12c 및 12b 와 12d) 을 관통하는 스루홀 (14a 및 14b) 을 형성하고, 이 스루홀 (14a 및 14b) 에 펀칭프레스에 의해 도체 (16a 및 16b) 를 충전하여 상기 양배선층을 전기적으로 접속하는 배선기판의 제조방법이 개시된다.     이 방법에서는 스루홀의 형성과 이 스루홀로의 도체충전을 펀칭프레스로 행할 수 있기 때문에, 스미어의 제거가 불필요하여, 전기적접속도 확실해진다.     또한 양면 또는 편면에 배선패턴 (23) 이 형성된 절연시트 (21), 이 배선패턴 (23) 및 절연시트 (21) 를 관통하는 스루홀 (26) 에 충전된 도전체 (28) 를 포함하여 이루어지고, 이 도전체 (28) 의 적어도 일단면이 상기 절연시트 (21) 및/또는 배선패턴 (23) 과의 정합면으로부터 돌출하여 프린트 회로판이 개시된다.    이 프린트 회로판을 여러장, 절연접착제층을 통하여 적층하여, 이들을 압착하는 것만으로 일괄 적층이 가능해진다.
Patent KR-20010086977-A (KR)
Title: internet family school
Inventor: PARK DAE UNG
Filed: 2000-03-06
Abstract: PURPOSE: A method for providing conception and service of a family portal educational site is provided to eliminate an economical burden due to educational expenses for individual members of a family by applying the notion of a member, who receives instruction, to a family, not an individual. CONSTITUTION: If a user accesses a supplier server(101), the server requests him to execute login. If the user inputs his ID and password(102), the server searches a member information DB to confirm whether he is registered(103). In case that the user is a formally registered member, the server grants a membership classification code for the user(106). The server carries out data analysis, based on the user's previous educational content information data, makes out a page, and transmits it with an educational page initial screen(114,115). After confirming an analysis result for his previous educational content, the user selects a curriculum(116) and drives a learning process execution program(117). The execution program requests a data processing part to execute data processing and analysis suitable for the user's request(118). The server executes database retrieval and analysis to make out an educational page suitable for the user's request and transmits it to him(119,122).
Patent KR-20010091273-A (KR)
Title: communication device having the play back function of background music
Inventor: YANG UNG SEOB
IPC: H04M1/00
Filed: 2000-03-14
Abstract: PURPOSE: A communication device having a background sound reproducing function is provided to hear a voice together with the background sound and perform a telephone conversation when a user performs the telephone conversation using the communication device. CONSTITUTION: A background sound generating unit(11) stores a plurality of background musics as a digital signal or an analog signal and selectively outputs the stored background musics. A voice signal input unit(1) inputs one voice between a user voice and a receiving voice when a call is generated according to a communication connection. An analog voice synthesizing unit(13) synthesizes the background sound signal generated in the background sound generating unit(11) and the voice signal inputted by the voice signal input unit(1). A power amplifying unit(15) amplifies the synthesized signal generated from the analog voice synthesizing unit(13) as a certain gain. An output unit outputs the synthesized signal amplified in the power amplifying unit(15) as an acoustic voice and background sound to a user, or transmits the synthesized signal toward a remote position.
Patent KR-20010091324-A (KR)
Title: Auto-sending Voice Card System Using Internet
Inventor: JUNG SANG EUN
Filed: 2000-03-14
Abstract: PURPOSE: A system for automatically sending the voice card through the internet is provided for a sender to record, check, edit, and deliver the own voice through an internet homepage. CONSTITUTION: The sender accesses the internet homepage(40) connected with the system for automatically sending the voice card through an internet connector(10). It is recommended that both a mike(20) for recording and a speaker for checking the recording are embedded in the internet connector. After selecting a design and background music of the voice card(80) according to the sender's preference, the sender records the own voice and signal to the voice card connected with a homepage server(60) through the mike. The recorded wave-typed file of the sender is attached to an internet mail and stored in the homepage server in real time. In other words, the sender's voice is recorded as the voice file by enabling a DTR(Data Transmission Ready) signal to a separable voice card(80) through a controller(50) which connects a voice card with a sound card of the server. Finally, the separable voice card is sent to the receiver.
Patent KR-20010006816-A (KR)
Inventor: WALLACE TYUUTEN
IPC: G06F13/14
Filed: 2000-03-16
Abstract: PURPOSE: A constitution alternations of a data processing system is monitored while the power source is turned on and to enable adaptation to the alterations by limiting the operation of the data processing system adaptively to operation factors of the system. CONSTITUTION: Event detection logic (80) is activated with a presence detection signal at the time of constitution alteration. The constitution alteration is made when at least one element is added or removed or in the case of a fault. The event detection logic (80) sends a detection signal to constitution management logic (82). The constitution management logic (82) processes the detection signal and recalculates usable resources and resources to be used by the data processing system . Then a signal is sent to notification logic (84) finally and when the difference between supply elements and demand elements exceeds a set threshold, the notification logic (84) controls the transmission of an interruption signal to system firmware (100) and/or an operating system (102).
Patent KR-20010091725-A (KR)
Title: Method for Manufacturing Capacitor of a Semiconductor device
Inventor: HONG DU JUN
IPC: H01L21/8242
Filed: 2000-03-17
Abstract: PURPOSE: A method for fabricating a capacitor of a semiconductor device is provided to increase the capacity of a capacitor by changing an oxide layer formed on a lower electrode of a capacitor to a nitride layer. CONSTITUTION: A field oxide layer(102) is formed on a substrate(100) in order to define an active region and a field region. A pad oxide layer is formed on the substrate(100). A gate oxide layer is grown on the substrate(100) after the pad oxide layer is removed. A polysilicon is deposited thereon. A lower electrode(104) of a capacitor is formed on the field oxide layer(102) by performing a photo-resist process. An oxide layer is formed on the lower electrode(104). The oxide layer is changed to the first nitride layer(106) by performing an in-situ process. The second nitride layer(108) is deposited on the first nitride layer(106). A dielectric layer pattern is formed by etching selectively the second and the first nitride layers(108,106). A spacer(107) is formed at a sidewall of the lower electrode(104) by etching back the oxide layer. An upper electrode(110) is formed on the second nitride layer(108). An interlayer dielectric(114) is formed thereon. A metal layer is deposited on the interlayer dielectric(114). A metal line(116) of the lower electrode(104) and a metal line(118) of the upper electrode(110) are formed by patterning the metal layer.
Patent KR-20010014629-A (KR)
Inventor: SANDRA PATRIK
IPC: G01N1/34
Filed: 2000-03-24
Abstract: PURPOSE: A method is provided to improve a solid phase trace extraction/analysis method for material in a carrier fluid. CONSTITUTION: In this method, a collector is contacted with a stirred fluid including material for a sufficient time, solid phase extraction for the material adhering to the collector is executed, and the separated material is carried with a carrier gas and analyzed. The carrier fluid including the material is stirred in a vessel of a magnetic stirrer(1) with a coated magnetic stir element(7) that is the collector, and/or the carrier fluid is moved by ultrasonic waves with the fluid tightly contacted with the collector, then the stir element(7) is moved to a solid phase extraction device(8).
Patent KR-20010020718-A (KR)
Title: Coextrusion binder, its use for a multilayer structure and the structure thus obtained
Inventor: LE ROY CHRISTOPHE
IPC: B29L9/00
Filed: 2000-04-06
Abstract: PURPOSE: Disclosed is a novel binder for coextrusion utilizable for e.g. a gasoline tank of an HDPE/binder/EVOH or PA/binder/HDPE structure. CONSTITUTION: The binder comprises 5-30 pts.wt. (A) polymer comprising (1) a mixture of (A1 polyethylene having a relative density of 0.935-0.980 with (A2) a polymer selected from among an elastomer, an ultra-low-density polyethylene, and an ethylene copolymer and prepared by co-grafting an unsaturated carboxylic acid onto the mixture of components A1 and A2 and (2) 95-70 pts.wt. (B) polyethylene having a relative density of 0.930-0.950, wherein the mixture of components (A) and (B) having the following properties (i) to (iii):(i) relative density = 0.930-0.950, (ii) content of grafted unsaturated carboxylic acid = 30-10,000 ppm, and (iii) MFI(melt flow index)=5-100 (as measured according to ASTM D 1238, 190 deg.C/2.16 kg).
Patent KR-20010096841-A (KR)
Inventor: KIM HYO CHEOL
Filed: 2000-04-15
Abstract: 본 발명은 인터넷 서적 전자상거래를 위한 온라인 매장에서, 구매자가 마치 오프라인 매장에 가서 직접 서적을 넘겨보는 것과 같은 느낌을 전달하기 위한 미리보기 기능을 구현하여 제공하고 아울러 그것을 구매자의 전자메일로 배달해 주는 서비스를 통하여, 구매를 촉진시키기 위한 것이다. 기존의 서적 온라인 매장에서는 단순한 표지 이미지와 목차 혹은 줄거리를 텍스트 형식으로 전시하여 방문객들에게 제공했지만, 본 발명을 적용한 온라인 매장에서는 기존의 내용은 물론 도서물의 내용 및 윤곽을 이미지 형태로 미리 보여줄 수 있게 되어 궁극적으로는 활발한 구매를 유도할 수 있게 된다. 물론 미리보기의 내용에는 음성 및 텍스트 형태의 정보도 포함된다. 그리고 미리보기 배달 서비스 코너를 온라인 매장에 개설하여 구매자가 요청하는 출판물에 대하여 저작권이 허락하는 범위 내에서 미리보기 내용을 제작하고 이를 전자우편 속에 연결시켜 요청자에게 배달함으로써 양질의 서비스와 극대화된 편의를 제공할 수 있다. 결과적으로 서비스 요청자는 굳이 오프라인 매장에 가지 않아도 전자우편을 점검하는 것 만으로 출판물의 윤곽 및 내용의 일부를 미리 볼 수 있게 되어 전자상거래를 통한 활발한 구매를 유도할 수 있게 된다.
Patent KR-20010106955-A (KR)
Inventor: KIM SANG HO
IPC: H04B17/00
Filed: 2000-05-24
Abstract: 본 발명은 광전송 시스템의 자기진단 전송속도 변환장치에 관한 것으로서, 개시된 자기진단 전송속도 변환장치는 전기 신호의 전송속도에 따라 발생하는 기준 클럭에 의해 PLL 록 이탈신호를 발생시켜 클럭 및 데이터를 재생하며, 온도 감지부를 각각 구비한 다수의 BICDR 수신기들; 상기 역다중화기의 광신호를 입력받아 DC 레벨값을 검출하여 전송속도 판별신호를 발생하는 DC 레벨값 검출부; 및 상기 BICDR 수신기들중, PLL 록 이탈신호가 발생되는 BICDR 수신기로 인가되는 광신호에 따른 DC 레벨값을 상기 DC 레벨값 검출부로부터 입력받고, 해당 BICDR 수신기의 온도 감지부로부터 온도 감지신호를 입력받아 메모리에 저장된 온도에 따른 전송속도 정보와 비교한 후, 해당 전송속도를 판별하여 전송속도 변화를 해당 BICDR 수신기의 동작 전송속도로 변경시키는 제어장치로 구성된다.
Patent KR-20010109568-A (KR)
Inventor: MUN YONG JUN
Filed: 2000-05-30
Abstract: 본 발명은 내장형 연료탱크가 장착된 온풍 난방기에 외장형 연료탱크를 추가 설치하여 상기 내장형 연료탱크의 연료가 일정량 이하일 때 간편하게 연료를 보충할 수 있는 온풍 난방기의 연료공급장치를 제공하기 위한 것이다. 
     이러한 공기조화기의 연료공급장치는 난방기의 캐비닛 내에 설치되어 연료가 저장되고 버너로 공급되는 내장형 연료탱크와; 상기 내장형 연료탱크로 연료를 공급할 수 있도록 상기 캐비닛의 외부에 설치되어 보충 연료가 저장되는 외장형 연료탱크와; 상기 내장형 연료탱크의 연료량이 일정량 이하이면 외장형 연료탱크로부터 연료가 공급되도록 하는 연료급유수단으로 구성됨을 특징으로 한다.
Patent KR-20010108870-A (KR)
Inventor: CHO NAM UK
Filed: 2000-06-01
Abstract: 본 발명은 주유니트와 예비유니트간의 입력신호 및 출력신호 절체시 릴레이를 사용하지 않는 전송시스템의 인터페이스 유니트 절체장치를 제공하기 위한 것으로, 이러한 본 발명은, 입력되는 신호를 인터페이스하는 주유니트와; 주유니트의 비정상 동작시 입력신호를 인터페이스하는 예비유니트와; 전송선로를 통해 입력되는 신호를 분배하여 주유니트 및 예비유니트로 출력하는 분배부로 구성되며, 상기에서 주유니트 및 예비유니트는, 입력되는 신호를 변환시키는 복수개의 트랜스부와; 트랜스부에서 변환된 신호를 인터페이스하여 출력하는 라인인터페이스부로 구성되어, 소비전력절감과 유니트내 공간운용의 효율 및 적응성 향상의 효과를 갖는 것이다.
Patent KR-20000058529-A (KR)
Inventor: CHOI SEOG TAE
IPC: A23N15/00
Filed: 2000-06-10
Abstract: PURPOSE: A separation and selection device of a whole bulb of garlic is provided which is able to improve the work efficiency by dividing a whole bulb of garlic into a clove of garlic without damaging external appearance of the garlic with transferring the whole bulb of garlic thrown in a hopper and respectively selecting the separated clove of garlic by size and also improve the quality and reliability of product. CONSTITUTION: The separation and selection device of a whole bulb of garlic comprises: (i) a whole bulb of garlic separator(10) which has a separator body to primarily divide the whole bulb of garlic into a clove of garlic; (ii) a clove of garlic selector(40) which has a separator body on the upper end of a support of the selector to secondarily select the separated clove of garlic; and (iii) a separator and discharger of the clove of garlic by size(50) which is selectively attached or detached to one side of the clove of garlic selector(40) and has a separator and discharger body on the upper end of a support of the separator and discharger to thirdly separate and discharge the selected garlic by size.
Patent KR-20010111961-A (KR)
Inventor: HWANG GYU CHEOL
Filed: 2000-06-14
Abstract: 본 발명은 전동기의 유동을 방지함과 동시에 포장박스의 부피를 줄일 수 있는 골판지를 이용한 전동기용 포장박스에 관한 것이다. 상기 골판지를 이용한 전동기용 포장박스는, 전동기의 일측이 받침판의 안착공을 통과하여 폭방향구획판의 안착홈에 안착된다. 즉, 인접하는 전동기와 전동기는 거의 접촉하는 형태로 적층되어 포장되므로, 전동기의 보관에 직접적으로 관여하지 않는 불필요한 공간이 제거된다. 그러므로, 포장박스의 부피가 감소된다. 또, 받침판의 안착공 및 폭방향구획판의 안착홈에 의하여 전동기가 이중으로 지지되므로 견고하게 보관된다.
Patent KR-20020003892-A (KR)
Title: The method for online auction using multiple currency and the system thereof
Inventor: KIM JEONG UNG
Filed: 2000-06-21
Abstract: PURPOSE: A method and a system for an on-line auction on the basis of a plurality of telephone calls are provided to integrate a domestic auction and an international auction and enable a buyer to receive an opportunity for a bid based on a currency of ones own country by setting a plurality of currencies as a standard of an auction. CONSTITUTION: If a seller connects to an auction site, an interface judges whether the seller is a normal seller and a log-in process for the seller is performed(200). A web server embodies an auction plural currency designating ticket to the seller and displays a plural currency designating dialogue window(201). The seller designates and inputs an auction plural currency(202) and the web server judges whether a plurality of currencies is designated in the inputted information(203). If a plurality of currencies is designated, the designated information is stored in a DB using a DB managing server(205). The web server displays the plurality of currencies(206) and obtains and displays exchange rate information of an exchange rate information supplying site using the interface as a standard for deciding an auction starting price of each designated currency(207). If the seller sets and inputs an auction starting price(208), the web server checks input or not of the set auction starting price using the DB managing server(209) and stores the price in the DB(211). If an auction starting price is not decided, an auction starting price designated by a pre-regulation is set and stored in the DB(210). Auction information inputted by the seller is displayed for a seller's checking process(212).
Patent KR-20010114124-A (KR)
Inventor: IM GI TAE
IPC: E04F15/18
Filed: 2000-06-21
Abstract: 발명이 속한 기술분야 : 본 발명은 이브이에이(Ethyrenc Vinyl Acetate)합성수지 발포체및탄성을 지닌 합성우레탄 발포체와 섬유뿜칠재를 이용한 단열,방진(층간소음방지)기능을 지닌 건축물의 단열방진 구조이다. 
     발명의 목적 : 공동주택 및 일반주택의 바닥 및 벽체 단열,흡음,진동방지의 목적으로 현장뿜칠 시공하는 현장직접뿜칠 시공 구조이다. 
     발명의 구성 : 섬유뿜칠재 압송뿜칠 시공 장비의 자재 송출 성능을 조절한 블로워식 압송 뿜칠장비 개선 조작으로, 상기의 주재료와 접착제를 동시 분사하는 압송 뿜칠 공법이며 동일한 방법으로 섬유뿜칠재를 표면에, 용도에 따른 분사를 하므로 단열,흡음,층간소음방지의 효과를 가지는 시공 구조이다. 
     발명의 효과 : 단열,흡음,방진의 현장시공 재료의 개선,단열,흡음,방진의 시공구조개선과 성능, 물성 증진효과를 얻게되며 단열,방진체 시공의 후속공정인 경량콘크리트 시공과정의 시멘트 슬러리 침투로 인한 성능저하를 개선한다.
Patent KR-20000054767-A (KR)
Inventor: BAE JUN HO
Filed: 2000-06-22
Abstract: PURPOSE: An advertising method using a joint lottery is provided so that advertisers can advertise by using a lottery ticket by issuing a lottery ticket printed advertisements of the advertisers after a plurality of advertiser invests one's advertising expense as a fund for a winning ticket. CONSTITUTION: An advertising method using a joint lottery includes several steps. A step is that a manager assembles advertisers and receives a fund for issuing a lottery ticket as an advertising expense (201). Thereafter, a number of lottery tickets, an issuing date, an amount of money of a winning ticket, a lot date are allocated (202). Thereafter, the lottery tickets are distributed (203) with various methods, for example, through a plurality of servers (302¯304) of industrial companies as electronic lottery tickets. A plurality of customers (113) possesses the distributed lottery ticket until it comes the date of lot, seeing the advertisement printed on the ticket. A ticket lot server (120) receives information of issuing lottery tickets from a lottery ticket issuing server (110) and thereafter it comes the date of lot, lots the lottery tickets and opens the result of lot according to the predetermined procedures.
Patent KR-20000058738-A (KR)
Inventor: HONG MAN YEUI
IPC: A63F13/814
Filed: 2000-06-27
Abstract: PURPOSE: A dancing booth is provided which is portably placed and wherein many entertainment tools are included. CONSTITUTION: The dancing booth comprises the parts of: a booth(1) which includes a cover(12) and wall(11) wherein a door(11a) is hinge-combined in the upper part of a support stand(10); an air adjusting device(20) wherein fans(21)(22) inside the cover and the support stand are connected to an inner part of the booth and a duct to suck and discharge air; a lighting device(30) wherein light at a lighting(31) of the cover is illuminated through a perspective window(12a) and a transparent roof plate(14) and a lighting inside the support stand is illuminated through a perspective window(10a)(13a) at the outer side of the support stand and a bottom plate(13); a monitor(40) and a speaker(41) which are inside the booth and the cover to print image and sound by a signal in a coin insertion device(50) of the booth.
Patent KR-20020002824-A (KR)
Inventor: PARK YEON JUN
IPC: G11C5/14
Filed: 2000-06-30
Abstract: PURPOSE: An internal voltage generation circuit is provided, which minimizes a voltage variation and reduces a current in a standby state by removing a delay time of supplementing an internal voltage by a feedback path. CONSTITUTION: A reference voltage generation part(10) generates a reference voltage(Nd1), and a clock control part(40) generates a pulse signal by multiplexing a clock(CLOCK) and a clock enable signal(CKE). A voltage comparison part(200) is controlled by an output signal(Nd9) of the clock control part and compares the reference voltage with an internal node voltage(Nd6). A PMOS transistor(P3) switches a power supply voltage to an output terminal by an output signal(Nd3) of the voltage comparison part. The first voltage sensing part(30) branches the voltage(VDC) of the output terminal with a constant voltage according to a threshold voltage(Vtp) of a serially connected transistor by the internal node voltage. The second voltage sensing part(60) branches the voltage(VDC) of the output port with a constant voltage according to a threshold voltage(Vtp) of a serially connected transistor. And a voltage selection part(50) controls the operation of the voltage comparison part by the output signal of the clock control part and selects the operation of the second voltage sensing part.
Patent KR-20020003431-A (KR)
Title: The way to make the public security of the function changing algorism which is stored in the hard disk of the client's computer is puited in the preservation of the public security and remote control system by the Hardware-Lock
Inventor: KIM WEL YOUNG
IPC: G06F15/00
Filed: 2000-07-03
Abstract: PURPOSE: A method for forming a security of a function exchange algorithm is provided to prevent an outflow of a backdoor program in the hard disk of the client computer and a recovery of the function exchange algorithm of the deleted hardware-lock by modulating the backdoor program installed in the client program and deleting it. CONSTITUTION: When a connection ends, a system for a security and a remote management using a hardware-lock, modulates a file related to a function exchange algorithm of the backdoor program installed in a client computer to a file having a fixed extension, as fixed time passes a counter of the backdoor program installed in the client computer. When the modulation ends, the system for the security and the remote management deletes a directory of the backdoor program installed in the hard disk of the client, by a delete order had built-in the backdoor program.
Patent KR-20020005918-A (KR)
Title: Sludge dry system using waste tire pyrolysis device
Inventor: PARK SU YONG
IPC: F26B3/00
Filed: 2000-07-11
Abstract: PURPOSE: A sludge type waste dryer using a waste tire pyrolysis system is provided to shorten the drying time of waste matter by applying at least two and more different drying methods sequentially according to changes in the water content of waste matter. CONSTITUTION: Sludge type waste matter is supplied into a container of a rotary drum dryer(400). A hot wind is blown to a rotary drum through a pyrolysis device(100) and a mixing chamber(600) to be heated at high temperature. The waste tire pyrolysis device cracks waste tires contacted with a heating pipe by heating the heating pipe with preheating burner. The flame is supplied to the mixing chamber. A pure oxygen feeder is installed on a side of the mixing chamber to prevent pollutants by igniting non-burnt gas. The hot air is distributed by a hot wind distributor and blown through a hot wind guide path of a hot wind guide plate to heat the entire surface of the rotary drum regularly. The waste matter is dried on the heated surface of the rotary drum and then piled upon a hopper(227). Steam is discharged through a hood and a duct while the hot wind is discharged through a heat exchanger or blown to an air pollution prevention unit(700) for removing odor and pollutants. The waste matter is dried with low cost by using thermal energy from waste tires.
Patent KR-20020007540-A (KR)
Title: door safety apparatus of clothing dryer
Inventor: JUNG TAE YEONG
IPC: D06F58/20
Filed: 2000-07-15
Abstract: PURPOSE: A door safety device in a clothes drying machine is provided to sense closing/opening state of a door by inputting low signal into two door sensing ports and to safely protecting a user by sensing opening or closing the door. CONSTITUTION: A door safety device for a clothes dryer comprises plural functional buttons inputting desirable drying condition; a power button turning on or off the clothes dryer; an operating button starting or stopping dry; a manipulating unit(50) having plural functional buttons; a door opening or closing sensing unit(60) detecting opening or closing the door; a control unit(70) outputting a control signal input from the manipulating unit; a heater(11) driven by the control unit; a motor rotating a drum by receiving the control signal output form the control unit; a drain fan rotated by the motor; a driving unit(90) controlling the heater to heat air absorbed in a drum; and a door switch(61) turned on/off according to opening or closing the door. Thereby, the door safety device for the clothes dryer protects a user by sensing opening or closing the door.