baber/WOPTO huggingface dataset:
Patent KR-20040060408-A (KR)
Title: CMP slurry for tungsten and manufacturing method for tungsten plug of semiconductor device using the same
Inventor: HAN MUN SU
IPC: H01L21/28
Filed: 2002-12-30
Abstract: PURPOSE: A slurry for CMP of tungsten and a method for forming a tungsten plug of a semiconductor device using the same are provided to prevent plug recess and erosion by using slurry including ionization oxidant such as HMnO4 and H2CrO4. CONSTITUTION: An interlayer dielectric(22) is formed on a substrate(21). A contact hole is formed by selectively etching the interlayer dielectric. A metal barrier layer(24) and a tungsten film are sequentially formed in the contact hole. A tungsten plug(25a) is formed by polishing the tungsten film and the metal barrier layer using slurry including ionization oxidant of HMnO4 or H2CrO4 of 0.1-5 weight percent.
Patent KR-20040060517-A (KR)
Title: 3-State Motor Operating Unit and Method Thereof
Inventor: KIM JEONG HUN
IPC: H02P1/40
Filed: 2002-12-30
Abstract: PURPOSE: A driving device of a three-phase induction motor and a driving method thereof are provided to control dually an operation of a motor by using a power control relay as well as a clockwise rotation contact relay and a counterclockwise rotation contact relay. CONSTITUTION: A driving device of a three-phase induction motor includes a clockwise rotation contact relay, a counterclockwise rotation contact relay, and a power control relay. The clockwise rotation contact relay(10) is operated to rotate a motor clockwise. The counterclockwise rotation contact relay(20) is operated to rotate the motor counterclockwise. The power control relay(30) is connected to the clockwise rotation contact relay or the counterclockwise rotation contact relay in order to generate the clockwise rotation or the counterclockwise rotation by turning on or turning off the power.
Patent KR-20040061888-A (KR)
Inventor: PARK NOU IL
IPC: B07B9/00
Filed: 2002-12-31
Abstract: PURPOSE: A sorting device of building waste is provided not to let loose the waste by simplifying the structure using the sorting screen instead of sorting barrel, by operating the blower in the front of the building waste dropped from the sorting screen and by letting it collected in the hopper. CONSTITUTION: The sorting device of building waste includes; a first sorter(20) separating the soil and fine particles over the appropriate size among the crushed building wastes; a sorting screen(100) freely dropping the waste which is not separated at determined slope angle after the particles with a prescribed size like sand etc. are filtered from the building waste sorted in the first sorter; a vibrating device(110) operating the second sorting by vibrating the sorting screen(100); a first hopper(120) collecting and feeding the particles, like sand etc. filtered through the net in the lower part of the sorting screen; a blower(200) blowing off at determined angle downwards in the front of the waste freely dropped without being filtered in the vibrating screen(100) and separating the light-weighted waste; a second hopper being mounted in the lower part of the dropping end of the sorting screen(100) and collecting and disposing of the light waste blown off by the blower; and a feeder(121,150) feeding the heavy waste freely-dropped from the sorting screen(100).
Patent KR-20020022107-A (KR)
IPC: H01Q9/04
Filed: 2001-06-14
Abstract: 안테나 배열은 적어도 하나의 입력(110)을 가지며 안테나 급전(feed)(104)에 가깝게 구현된 멀티플렉서(106)를 통해 급전된 다주파대 안테나(102)를 포함한다. 상기 멀티플렉서(106)는 안테나 매칭 및 광대역화(broadbanding) 회로를 병합할 수 있다. 상기 개시한 배열은 매칭 및 광대역화가 각 입력 주파수와는 무관하게 고안될 수 있어서, 성능을 개선시키고 구성 요소의 총수를 줄이는 장점이 있다. 게다가, 멀티플렉서의 성능을 떨어트릴 수도 있는 기생 구성 요소의 영향이 최소화된다.
Patent KR-20020025995-A (KR)
IPC: H01Q9/34
Filed: 2000-08-17
Abstract: 본 발명은 가요성 안테나 방사기(1)에 관한 것이다.  본 발명의 목적은 가능한 한 짧은 전기적 길이를 갖도록 안테나 방사기(1)를 개량하여, 넓은 송신 및/또는 주파수 수신 범위를 허용하는 것이다.  이를 위해, 가요성 안테나 방사기(1)는, 한편으로는 안테나 로드(10)를 보유하고 다른 한편으로는 나선형 스프링(5)과 나사 결합된 지지 요소(15)를 이용하여 안테나 로드(10)를 수용하기 위한 나선형 스프링(5)을 포함한다.  상기 지지 요소(15)에는 안테나 로드(10)를 위한 관형상 수용부(20)가 제공된다.  상기 관형상 수용부(20)의 외부 표면에는 나선형 스프링(5) 안으로 나사 결합된 나사산형 프로파일(25)이 제공된다.
Patent KR-20020038935-A (KR)
IPC: B42F13/24
Filed: 2001-08-02
Abstract: 파일에 구멍이 뚫린 종이 더미를 보존하기 위한 장치, 예를 들면 아치 레버 파일용 아치 레버 메커니즘이 개시되어 있다. 장치는 베이스(10); 종이들의 여백 구멍에 결합하기 위하여 베이스에 고정되어 상방으로 연장하며, 가동성의 제 1 부분(18)과 제 2 부분(16)으로 구성되고, 종이들의 여백에 있는 구멍들에 결합하도록 정렬되는 적어도 두 개의 링(14); 각 링(14)의 제 1 및 제 2 부분들(16, 18)이 서로 인접하여 폐루프를 형성하는 (도시된 바와 같은) 닫힌 위치와 각 링의 제 1 및 제 2 부분들이 서로 이격되어 종이들이 링들에 추가되거나 링들로부터 제거될 수 있게 하는 열린 위치 중 어느 한 위치에 각 링의 제 1 및 제 2 부분을 유지하기 위한 메커니즘으로, 핸들단(45)과 작동단(47)을 가지는 레버(42)를 포함하며, 작동단은 각 링의 제 1 및 제 2 부분들을 열린 위치와 닫힌 위치 사이에서 이동시키기 위해 메커니즘의 나머지 부분과 협동하고, 레버의 핸들단의 표면은 금속보다 부드러운 재료, 바람직하게는 플라스틱 재료로 형성되는 메커니즘을 포함한다.
Patent KR-20020064310-A (KR)
IPC: A61B8/00
Filed: 2001-08-30
Abstract: LCD의 휘도를 어두운 곳에 적합한 수준으로 저하시키는 것을 가능하게 하기 위해서, 소정의 화상이 표시되게 하는 제1 화상 데이터 또는 동일한 화상이 제1 화상 데이터에 근거한 소정의 화상보다 낮은 휘도로 표시되게 하는 제2 화상 데이터가 선택 수단를 통해 LCD에 전달된다.
Patent KR-20020069362-A (KR)
Title: Nitrogenous cyclic compounds and pharmaceutical compositions containing the same
IPC: C07D487/08
Filed: 2001-01-18
Abstract: The present invention provides a novel compound having a superior calcium antagonism, in particular, a neuron-selective calcium antagonism. Namely, it provides a compound represented by the following formula (I), a salt thereof or a hydrate of them:   
wherein Ar is a thiophene or benzene ring which may be substituted,the ring A is a piperazine ring, homopiperazine ring or piperidine ring which may be substituted, the ring B is a C 6-14  aromatic hydrocarbon ring or 5- to 14-membered aromatic heterocyclic ring which may be substituted, the partial structure -D 1 -E-D 2 - is a C 1-4  alkylene group, W 1  and W 2  are the same as or different from each other and each represents (1) a single bond or (2) a C 1-6  alkylene chain which may be substituted, X is (1) an oxygen atom, a group represented by (2) the formula -NR 2 - (wherein R 2  indicates a hydrogen atom, or a C 1-6  alkyl group, a C 3-8  cycloalkyl group, a lower acyl group or a C 1-6  alkylsulfonyl group which may be substituted) or (3) -NH-SO 2 -, R 1  is a methyl group, an ethyl group, a n-propyl group or an isopropyl group.
Patent KR-20020069027-A (KR)
IPC: B32B27/06
Filed: 2001-02-13
Abstract: 상부 표면 및 하부 표면을 가지는 이축 연신 중합체 필름을 제 1 부분과 제 2 부분으로 슬릿팅하고, 제 1 부분과 제 2 부분을 확인하며, 제 1 부분을 제 2 부분의 표면으로 배치하여, 제 1 부분의 하부 표면이 제 2 부분의 상부 표면으로 인접하게 하는 단계를 포함하는 강화된 중합체 필름 구조를 형성하는 방법을 기재하였다. 이 구조는 충격 및 인열 저항 라미네이트를 제공한다. 또한 이축 연신 중합체 필름의 두 부분의 분자 배향 방향 프로파일을 확인하고 하나의 분자 배향 방향 프로파일이 다른 하나의 분자 배향 방향 프로파일과 일치하지 않도록 두 부분을 층 형성시킴으로써 중합체 필름 구조를 형성하는 방법도 기재하였다.
Patent KR-20020075435-A (KR)
IPC: C08J3/05
Filed: 2001-02-16
Abstract: The overall performance of water-reducible polymer dispersions, more specifically alkyd dispersions, can be substantially improved by utilizing resins derived from acidolysis reaction products of polyalkylene terephthalates and polyalkylene naphthalates. According to this invention, polymer dispersions can be produced from low acid value polymers and yet have good water dispersibility. When an aqueous coating composition is formulated using the dispersion of this invention, a final coating is formed that has good hydrolytic stability, and when blended with a latex, exhibits improved gloss and wet adhesion.
Patent KR-20020079886-A (KR)
Title: 고속 전류 스위치 회로
IPC: G11B7/126
Filed: 2001-12-21
Abstract: 본 발명의 고속 전류 스위치 회로는, 전류를 스위칭하여 출력하는 N형 MOS 트랜지스터 Q11과, 이 MOS 트랜지스터 Q11을 스위칭 제어하는 제어 회로(11)를 구비하고 있다.  제어 회로(11)는, N형 MOS 트랜지스터 Q12와, 그 부하인 정전류원 I2에 의해 소스 폴로워를 형성하고 있다.  MOS 트랜지스터 Q12에는, MOS 트랜지스터 Q12에 흐르는 전류를 스위칭 제어하기 위해, 스위치 SW11이 접속되어 있다.  또한, 제어 회로(11)는, MOS 트랜지스터(11)의 게이트를 접지 가능한 스위치 SW12를 포함하고 있다.  MOS 트랜지스터 Q12의 소스는, MOS 트랜지스터 Q11의 게이트에 접속되어 있다.  이에 따라, 출력 트랜지스터에 대전류를 흐르게 하는 경우에도, 그것을 고속으로 스위칭 동작할 수 있다.
Patent KR-20030001477-A (KR)
Title: Sprayable coating composition
Inventor: KLINKENBERG HUIG
IPC: C08K5/00
Filed: 2001-05-23
Abstract: The present invention relates to a sprayable coating composition comprising a) at least one isocyanate reactive compound comprising at least one thiol group, b) at least one polyisocyanate-functional compound, and c) a catalyst comprising at least one organic metal compound where the metal is a metal of Groups 3 to 13 of the Periodic Table. The invention also relates to use of the sprayable coating composition as a clear coat, its use as a clear coat, its use as a clear coat in a multi- layer lacquer coating, and its use in the refinish industry and in finishing large transportation vehicles.
Patent KR-20040063444-A (KR)
Title: Chemical vapor deposition system and method of cleaning the same
Inventor: JUNG SEUNG UK
IPC: H01L21/205
Filed: 2003-01-07
Abstract: PURPOSE: A CVD(chemical vapor deposition) apparatus is provided to eliminate an unnecessary reaction material in an LPCVD(low pressure chemical vapor deposition) apparatus by including a cleaning gas introducing nozzle in the LPCVD apparatus and by introducing cleaning gas through the nozzle while maintaining uniform pressure and temperature. CONSTITUTION: The CVD apparatus includes a reaction chamber, a substrate supporting unit(110) mounted with a heating unit, a reaction gas nozzle(120) and a shower head(140). A coating layer with heat resistance and acid resistance is formed in the reaction chamber and on the substrate supporting unit and the shower head. An inside cleaning gas introducing nozzle(130) supplies cleaning gas to the coating layer.
Patent KR-20040063649-A (KR)
Title: Did instance document adaptation method using anchor preference descriptor
Inventor: KIM DO NYEON
IPC: G06F17/21
Filed: 2003-01-08
Abstract: PURPOSE: A method for adaptationally generating a DID(Digital Item Declaration) instance document using an anchor preference descriptor is provided to generate the adaptational DID document by describing the anchor precedence with a target anchor component and an anchor class of the target anchor component based on the anchor preference for the anchor. CONSTITUTION: The anchor preference descriptor(101) comprises the target anchor component(102) fixing a target anchor and the anchor class(103) describing the user preference of the target anchor component. The anchor class comprises a precedence component(104) of the anchor and a fragment component(105) describing time/location of a resource, and describes a method type attribute displaying the method for fixing the precedence. The method selects one from insertion(107), deletion(108), and modification(109). To configure the DID instance document in a form applicable to an anchor, a DIAinDID(Digital Item Adaptation in DID) descriptor(110) is defined.
Patent KR-20040064463-A (KR)
Inventor: KATSUTA TAKASHI
IPC: B25J19/00
Filed: 2003-01-13
Abstract: PURPOSE: A robot system is provided to decrease the limits on the motion range of a robot and to prevent the stoppage of a production line. CONSTITUTION: A tool(3) mounted in the wrist of a robot(R) exchanges information with a control panel(4). The robot system includes a charge cell(1) as a power supply of the tool and a charger(2). An automatic exchange unit for changing the contact of the tool is installed in the charge cell. If the electricity of the charge cell of the tool decreases, the charger is used to recharge the charge cell. Two chargers and one charge cell are mounted on a charge plate(5).
Patent KR-20040065805-A (KR)
Inventor: KIM DAE JUNG
IPC: H04N7/01
Filed: 2003-01-16
Abstract: PURPOSE: A device for scaling a digital image is provided to obtain one coefficient by subtracting a sum of 3 coefficients from a constant 1, and to output the obtained coefficient to an interpolation filter, thereby reducing an amount of operations as realizing a flat field response. CONSTITUTION: Plural line buffers(401) store input pixels in line unit. A filter(402) filters the pixels, and outputs 4 input sample pixels in vertical direction. An image resampler(404) inputs size information on input/output images, determines coordinates of the input images, determines pixels of the input images necessary for an interpolation, and outputs a distance of resampled output pixels. A coefficient generator(405) inputs the distance to obtain 3 coefficients, obtains one rest coefficient by subtracting a sum of the 3 coefficients from a constant 1, and outputs the obtained coefficient. An interpolation filter(403) multiplies the coefficient by each input sample pixel, adds up all the pixels, and determines a value of the interpolated pixels.
Patent KR-20040066270-A (KR)
Inventor: KIM HUN YEONG
IPC: H01J29/28
Filed: 2003-01-17
Abstract: PURPOSE: A flat panel display device is provided to allow for a superior electrical conduction between phosphor particles constituting a phosphor layer. CONSTITUTION: A flat panel display device comprises a first substrate; an electron emitting unit formed on the first substrate; a second substrate(4) spaced apart from the first substrate, wherein the second substrate cooperates with the first substrate so as to form a vacuum container; and a light emitting unit formed on the second substrate, and which emits light by the electrons emitted from the electron emitting unit. The light emitting unit includes an anode electrode(16) formed on the second substrate opposed to the first substrate; a phosphor layer(18) formed into a predetermined pattern on the anode electrode; and a conductive layer(20) made of a carbon-base material and formed on the phosphor layer.
Patent KR-20040066391-A (KR)
Inventor: KO MOO SUNG
Filed: 2003-01-17
Abstract: PURPOSE: A system and a method for managing drawing a purchase article on a shop are provided to automatically perform the drawing of a premium and the discount for the buyers buying the articles by using the information for a sort, price, and a date of the article. CONSTITUTION: A control manager(20) includes an interface(24) for the communication with a packet based network and performs general operations for the purchase article drawing management. A homepage(22) provides a member connected through the packet based network with a purchase article drawing service including a drawing result view, a drawing article/target article inquiry, a sales state inquiry of each article, and a purchase article particulars inquiry. A database(26) is controlled by the control manager, and includes a registered shop management storage(28), a member purchase article management storage(30), an article drawing rule storage(32), an accumulated article sales storage(34), and an article drawing progress management storage(36).
Patent KR-20040075221-A (KR)
Inventor: LEE TAE HYEON
IPC: G06F9/00
Filed: 2003-02-20
Abstract: PURPOSE: A method for executing the POST(Power On Self Test) on a mainboard that a controller ROM is removed is provided to make the POST of a system BIOS(Basic Input/Output System) execute a process for boarding a LAN controller and an IEEE1394(Institute of Electrical and Electronics Engineers) controller on the mainboard. CONSTITUTION: It is judged that a product serial number of the system is stored in the BIOS installed to the mainboard(S130). If the product serial number is stored in the BIOS, an MAC(Media Access Control) address and a global ID are respectively set by using the product serial number(S134,S144). If not, the MAC address and the global ID are respectively set by using the serial number stored in a predetermined place of a DMI(Desktop Management Interface)(S132,S142). The MAC address and the chipset information of the LAN controller are programmed to the LAN controller(S136). The global ID and the chipset information of a serial interface controller are programmed to the serial interface controller(S146).
Patent KR-20040079485-A (KR)
Inventor: KIM YEONG GON
IPC: G06F1/00
Filed: 2003-03-07
Abstract: PURPOSE: A portable electronic device equipped with a protecting cap is provided to effectively protect a connection port and plan use convenience by keeping a position in a state opening or closing the connection port as moving the protecting cap. CONSTITUTION: A main body(1) is equipped with projection(5) at the outside. The protecting cap(3) is equipped with a guide groove(31) slid along the main body by being inserted into the projection. The elastic projections(33) temporarily limiting the movement of the projection are formed at both ends of the guide groove. A sway preventing projection prevents the protecting cap form being swayed to left/right when the protecting cap is moved. A sway preventing groove formed to the main body lengthwise is slid by being inserted into the sway prevention projection.
Patent KR-20040081236-A (KR)
Inventor: CHOI OK GYEONG
IPC: C07D213/74
Filed: 2003-03-14
Abstract: PURPOSE: A purification method of crystal form I of torasemide is provided, thereby reducing the time for purifying the crystal form I of torasemide, and improving the purity and yield thereof. CONSTITUTION: The purification method of crystal form I of torasemide represented by the formula(1) comprises the steps of: reacting a compound of the formula(2) with phenylchloroformate to prepare a compound of the formula(4), and reacting the compound of the formula(4) with isopropylamine to prepare the crystal form I of torasemide of the formula(1); and dissolving the crystal form I of torasemide of the formula(1) in a mixed solvent of water and water-soluble aprotic solvent such as acetone at 60 to 70 deg. C, and cooling the solvent to 5 to 10 deg. C.
Patent KR-20040081651-A (KR)
Inventor: NAM SEUNG U
IPC: B22F1/18
Filed: 2003-03-15
Abstract: PURPOSE: Provided are a diamond particle for a sintering tool, which does hardly surface-corrode after sintering, a method for preparing thereof and a sintering tool comprising the diamond particle preparing thereof, which has good tool life span and cutting speed. CONSTITUTION: The diamond particle has a coating layer consisting of 1-6 wt.% of Cr, 3-11 wt.% of Al, 4-14 wt.% of Si and the remaining of Ti and inevitable impurities. The method for preparing the diamond particle comprises steps of (a) forming the coating layer consisting of consisting of 1-6 wt.% of Cr, 3-11 wt.% of Al, 4-14 wt.% of Si and the remaining of Ti and inevitable impurities by a metal vapor deposition method on the diamond particle; and (b) sintering the coated diamond particle.
Patent KR-20040082574-A (KR)
Inventor: JUNG GI JUNG
IPC: H04B7/26
Filed: 2003-03-19
Abstract: PURPOSE: A method for detecting a position of a mobile communication terminal is provided to reduce load of a base station system, a mobile switching center, a position determination server, and a location based service server, and increase the efficiency. CONSTITUTION: A user of a mobile communication terminal sets up position information request conditions in the mobile communication terminal(S41). A location based service server transmits the position information request conditions to the mobile communication terminal(S42). It is identified whether the mobile communication terminal satisfies the position information request conditions(S43,S44). The mobile communication terminal starts a request for communication with a position determination server(S45). The position determination server transmits a reference GPS(Global Positioning System) satellite signal to the mobile communication terminal(S46). The mobile communication terminal receives a GPS satellite signal, and transmits the GPS satellite signal to the position determination server(S47). The position determination server determinates a position of the mobile communication terminal based on the GPS satellite signal, and transmits the position of the mobile communication terminal to the location based service server(S48,S49).
Patent KR-20040085582-A (KR)
Inventor: HWANG SEONG HYEOK
IPC: C08J7/18
Filed: 2003-04-01
Abstract: PURPOSE: Provided is a device for surface modification of waste rubber, which uses a ring-shaped vibrator for ultrasonic treatment of waste rubber and tire powder to increase the recycle efficiency of waste rubber and tires. CONSTITUTION: The device comprises a hopper into which waste rubber particles are introduced, an extruder for extruding the waste rubber particles, an ultrasonic vibration unit(20) formed at one end of the extruder for generating ultrasonic waves, a controller for controlling a ring-shaped ultrasonic vibrator, and an outlet for discharging treated particles. The ultrasonic vibration unit(20) comprises a pair of flanges(21), a pair of supports(22a), a vibration portion(24a), a vibrator(26) and a fixing pin(27). Each flange(21) has a bolt(25) joining hole, a through-hole(28) for waste rubber and a fixing pin joining hole. The supports(22a) communicate with the through hole(28). The vibration portion(24a) has a hole(24b) in which the vibrator(26) is disposed. The vibrator(26) having a bent portion at a desired angle is inserted and mounted in the bolt(25). The fixing pin(27) connects the flanges(21) to each other.
Patent KR-20040087544-A (KR)
Inventor: KIM SEUNG HYEON
IPC: H04W8/28
Filed: 2003-04-08
Abstract: PURPOSE: A communication system and method for transmitting/receiving between mobile terminals by using a fixed line telephone network are provided to enhance speech quality and reduce a telephone charge by wholly or partly using a fixed line telephone network for a mobile communication network. CONSTITUTION: Mobile terminals(11-16) include a switching switch for switching communication with base stations(71,72) and communication with fixed line telephone terminals(21-24) and an RF signal controller for exchanging an RF signal with the fixed line telephone terminals(21-24). The fixed line telephone terminals(21-24) include an RF signal controller for exchanging the RF signal with the mobile terminals(11-16) and a communication modem for automatically transmitting a number of a mobile terminal sensed with the RF signal and its own number to a fixed line communication exchange(30). The fixed line communication exchange(30) includes a phone number exclusive for registration, an AD converter(40) for converting an analog signal received from a fixed line phone terminal through the exclusive phone number into a digital signal, and a database register(50) for storing data.
Patent KR-20040093314-A (KR)
Inventor: CHOI SANG UK
IPC: A61K8/72
Filed: 2003-04-29
Abstract: PURPOSE: Provided are a pearlescent skin softner which contains fatty acid to form pearl and has excellent stability to aging and a manufacturing process thereof. CONSTITUTION: The pearlescent skin softner is characterized by containing fatty acid 0.05-0.3 wt.% of stearic acid as fatty acid, 0.01-1 wt.% of sodium methyl cocoyl taurate as water soluble anionic surfactant, and 0.01-0.4 wt.% of a polymer selected from guar gum, xanthan gum and sodium hyaluronic acid. It further contains water soluble coloring.
Patent KR-20040093992-A (KR)
Inventor: SA SEUNG HUN
IPC: H01L27/146
Filed: 2003-04-30
Abstract: PURPOSE: A CMOS image sensor and a method for manufacturing the same are provided to enhance the resolution of the image sensor by using photodiodes with different depth according to colors. CONSTITUTION: A p-type substrate(21) is defined with a red region(R), a blue region(B) and a green region(G). Photodiodes are provided with first, second and third N- regions(28a,28b,28c) and a p0 region. The N- regions have different depth according to the color regions. That is, the depth(h1) of the first N- region(28a) in the red region is deeper than the depths(h2,h3) of the second and third N- regions(28b,28c) formed in the blue and greed regions.
Patent KR-20040095132-A (KR)
Title: Multi-functional book holder capable of firmly holding a book regardless of weight, thickness, and size of the book
Inventor: LEE JAE WHOAN
IPC: A47B23/00
Filed: 2003-05-06
Abstract: PURPOSE: Provided is a multi-functional book holder which is capable of firmly holding a book to enable a user to read the book without inconvenience in any posture including a reclined posture, and a lying posture. CONSTITUTION: The multi-functional book holder comprises: a front holder panel(2); a rear holder panel(3); a holder top portion(4); and a holder bending portion(5), wherein the book holder is made of a resilient material and firmly fixes a book through angle adjustment so that the book is not separated from the book holder irrespective of the size, thickness or weight of the book.