baber/WOPTO huggingface dataset:
Patent KR-20020006615-A (KR)
Inventor: KANG GIL BAK
IPC: F16B47/00
Filed: 2001-11-26
Abstract: PURPOSE: A vacuum adsorption unit is provided to keep the vacuum state of a rubber pad regular even though a worker touches a grip, by adopting a rotary handle of a vacuum adsorption unit, to prevent the vacuum adsorption unit from being removed before the worker cancels the vacuum state with turning the handle, and to prevent accidents caused by falling of glass plates or metal plates by keeping the vacuum state of the rubber plate regular. CONSTITUTION: A rubber pad(11) is formed integrally with a disk(12), and a shaft is mounted in the center of the disk integral with the rubber pad. The central shaft has a rectangular portion(13a) at the lower part, and a circular portion(13b) of annular bar type formed at the upper part. The rectangular portion and the circular portion are formed prevent the central shaft from rotating together when a rotatable handle(200) is rotated to a side. The central shaft is not rotated but moved up and down even though the rotatable handle is rotated. A trapezoid type spring(14) is mounted on the outer circumference of the central shaft, the upper part of the rubber pad. A central shaft guide is formed on the spring. The central shaft guide has a fixing unit(120) fixed by a thread(121) at the lower part, and an inclined portion(110) formed at the upper part with an outer diameter larger than one of the fixing unit. The inclined portion has stoppers(113) formed at both sides and a rectangular hole(114) accepting the rectangular portion of the central shaft for the central shaft to be moved up and down simply. The rubber pad is kept vacuum even though a worker touches the rotary handle by mistakes. In addition, the vacuum adsorption unit is moved simply from side to side. Thereby, the vacuum adsorption unit is used conveniently.
Patent KR-20030043336-A (KR)
Title: Clothes using chitosan and flocking layer
Inventor: KIM SUNG SHIL
IPC: A41D1/00
Filed: 2001-11-28
Abstract: PURPOSE: Clothes having a chitosan fiber and a flocking fiber are provided to absorb sweat and odors, carry out an antibacterial action and selectively finger-press a desired acupuncture point. CONSTITUTION: The clothes have a plurality of projections(20), each of the projection(20) having an adhesive layer(21) formed on an inner side of the bottom face(10) in a predetermined pattern and a flocking fiber layer(23), which is a mixture of a chitosan fiber and a natural fiber, the adhesive layer(21) and the flocking fiber layer(23) stacked sequentially. The adhesive layer(21) is a silicon adhesive that is unharmful to a human body and an antibacterial agent layer(22) is composed of a far infrared diverging material such as chitosan and rock powder.
Patent KR-20020077025-A (KR)
Title: Level shift circuit for stepping up logic signal amplitude with improved operating speed
Inventor: YAMAGUCHI SEIICHIRO
IPC: H03K3/356
Filed: 2001-11-30
Abstract: PURPOSE: To provide a level shift circuit that can be operated at a higher speed. CONSTITUTION: N-channel MOS transistors (TRs) N3 and NS3 are connected in series between a P-channel MOS TR P1 and an N-channel MOS TR N1S configuring a 1st inverter connected between a reference level VSS and a power supply level VDD2 (VDD1<VDD2) and similarly N-channel MOS TRs N4 and N4S are connected in series between a P-channel MOS TR P2 and an N-channel MOS TR N2S configuring a 2nd inverter. The gate insulation film of the P- channel MOS TRs P1, P2 and of the N-channel MOS TRs N3, N4 is thicker than that of the N-channel MOS TRs N1S-N4S. The gate of the N-channel MOS TRs N3, N4 is connected to the power supply level VDD2, the gate of the N-channel MOS TRs N3S, N4S is connected to the VDD1 and the TRs above are all normally conductive.
Patent KR-20020041784-A (KR)
Inventor: KIM JANG SU
IPC: G06Q50/00
Filed: 2001-12-12
Abstract: PURPOSE: Provided is a language education system with thinking unit and association question based which provides thinking unit and association question and changes each sentence as situation so that it helps to learn language effectively. CONSTITUTION: The language education system with thinking unit and association question based comprises the parts of: a storage part for learning materials(110) which stores one sentence as thinking unit and connection question thereof in text and bases on an extraction control signal to produce relevant thinking unit and connection question text; a storage part for reception materials(150) which checks data received through network to sort out as text, audio or member information and store respectively; and a transmission control part(130) which bases on member information to extract thinking unit and connection question text for members and transmit thinking unit and connection question text stored as appropriate sequence through network.
Patent KR-20030050291-A (KR)
Title: drum-type washing machine to selectively mount motor by having tub formed with motor-bracket as a unit
Inventor: PARK SAM JE
IPC: D06F37/30
Filed: 2001-12-18
Abstract: PURPOSE: A drum washing machine having a tub integrally formed with a motor bracket for installing a motor selectively is provided to reduce assembling process and cost and install a BLDC(brushless direct current) motor and a universal motor selectively by injection-molding a motor bracket integrated with the tub, and to keep the constant distance between the motor pulley and the drum pulley by mounting the motor in the tub regularly. CONSTITUTION: A drum washing machine comprises a body; a tub(101) integrally forming a first motor bracket(200a) for mounting a universal motor, a second motor bracket(200b) for a BLDC motor, and a third motor bracket(200c) for both motors; the BLDC motor and the universal motor installed in the first, second or third motor bracket selectively; a drum rotated and installed in the tub; a motor pulley connected to the motor; a drum pulley connected to the rear part of the drum; a hanging spring installed between the body and the tub to suspend the tub in the body; and a damper installed in the tub to damp vibration. The BLDC motor or the universal motor is installed selectively and conveniently, and process and cost are reduced.
Patent KR-20030050523-A (KR)
Inventor: GO WUN MAM
IPC: C12G3/02
Filed: 2001-12-18
Abstract: PURPOSE: Steamed red ginseng wine is manufactured by adding 10% of steamed red ginseng powder to the raw material of wine, and fermenting them. It contains pharmacologically active components contained steamed rd ginseng and is thus good for the human health. CONSTITUTION: A process for preparing steamed red ginseng wine comprises the steps of: mixing 40% of steamed rice, 50% of yeast, 10% of steamed red ginseng and an appropriate amount of water; fermenting the mixture thereof for a certain period of time; heating the fermented mixture in a vessel at 100 deg. C; and collecting distilled water, wherein the steamed red ginseng is produced by washing fresh ginseng(4 to 6 year old) with water, steaming at 100 deg. C for 2 hours, drying with wind of 50 deg. C under the humidity of 12 to 13%, and repeating the steaming and drying processes 9 times.
Patent KR-20020085771-A (KR)
Inventor: TSUGE RIKI
IPC: F23C3/00
Filed: 2001-12-26
Abstract: PURPOSE: Structure for preventing the disconnected air of a combustion chamber is provided to surely prevent the disconnected air in a combustion chamber without using heat-resisting packing. CONSTITUTION: In a side panel(1a) of a burner case(1), protruded portions(3) protruded toward the inner portion of the burner case are formed continuously on an R section, the boundary of a rear wall and side walls formed on both ends of the rear wall. A circumferential end portion(230) of an inject panel(23) is placed on a platform(30) of the protruded portion. According to the structure, the airtightness between the inject panel and the side panel is secured. Therefore, the generation of the disconnected air toward flowing toward a combustion chamber(C) is suppressed.
Patent KR-20020023880-A (KR)
Inventor: CHOL SUNG OOK
IPC: G09F3/12
Filed: 2001-12-17
Abstract: PURPOSE: A rack capable of displaying a commercial advertisement is provided to allow a passenger to conveniently hang personal belongings or a shopping bag, and to reduce the manufacturing cost of the rack by virtue of the commercial advertisement. CONSTITUTION: The rack capable of displaying a commercial advertisement consists of a flat base plate(1) of rectangular shape, a hook member(2) attached to the one side of the flat base plate for allowing a user to conveniently hang personal belongings or a shopping bag, a commercial advertisement display plate(3) attached to the remaining portion of the flat base plate, a hook support(4) for reinforcing the hook member, and an attachment screw nail hole(5) for attaching the flat base plate to a body of a bus.
Patent KR-20030052226-A (KR)
Title: The manufacture metal to shide socks
Inventor: PARK SEO HYUN
IPC: A41B11/00
Filed: 2001-12-20
Abstract: PURPOSE: A method of making functional sock is provided to give the antimicrobial effect to the sock in order to inhibit the propagation of athlete's foot together with the deodorizing effect. CONSTITUTION: An antimicrobial is prepared by mixing tin chloride, hydroxine, hydrochloric acid and soda citrate with a silver solution. A loess water is made by mixing jade, ceramic and loess with water. The loess water is added to the antimicrobial to make an antimicrobial loess solution. An alkali synthetic zeolite is made, and dissolved in water to make a zeolite solution with the pH of 10. The target sock is dipped first in the antimicrobial loess solution, and then in the zeolite solution.
Patent KR-20010071773-A (KR)
Title: 카메라에 의한 정보 수집 방법 및 카메라 시스템
IPC: H04N5/225
Filed: 2000-04-27
Abstract: 전문가용 카메라로 이루어진 기록을 보다 유연성 있게 행하기 위하여, 저해상도의 기록된 정보를 통신 수단을 통해 카메라가 먼저 스튜디오실로 전송하는 방법 및 카메라 시스템이 제안되어 있다.  스튜디오실내의 오퍼레이터는 고해상도의 정보 부분을 스튜디오실로 전송하기를 원하고 요청하는 것이 기록된 정보의 어느 부분인지를 선택하고/거나 편집한다.
Patent KR-20010071883-A (KR)
IPC: A61K9/16
Filed: 1999-07-13
Abstract: An excipient comprising trehalose which has a purity of 99.0 % or higher, a content of 75- mu m and larger particles of 2 to 90 wt.%, an average particle diameter of 10 to 250  mu m, an apparent specific volume of 1.5 to 3.5 ml/g, and a whiteness of 90 % or higher.
Patent KR-20010101010-A (KR)
IPC: H01L29/423
Filed: 1999-11-04
Abstract: 오프셋 드레인 페르미-문턱 전계 효과 트랜지스터(페르미-전계 효과 트랜지스터)는 집적회로 기판 내의 소정 거리 이격된 소스 및 드레인 영역과, 상기 집적회로 기판 내에 형성되고, 상기 소정 거리 이격된 소스 및 드레인 영역 사이에 있는 페르미-전계 효과 트랜지스터 채널을 포함한다. 게이트 절연막은 상기 집적회로 기판 상에 형성되고, 상기 소정 거리 이격된 소스 및 드레인 영역 사이에 형성되며, 게이트 전극이 상기 게이트 절연막 상에 형성되어 있다. 상기 게이트 전극은 상기 드레인 영역보다는 상기 소스 영역에 더 가깝다. 다르게 표현한다면, 상기 드레인 영역은 상기 소스 영역보다는 상기 게이트 전극으로부터 더 멀리 떨어져 있다. 상기 오프셋 드레인 페르미-전계 효과 트랜지스터는 드레인 영역 및 페르미-전계 효과 트랜지스터 채널 사이에 상기 채널 내에서 상기 페르미-전계 효과 트랜지스터의 잇점을 유지하면서 고전압 및/또는 고주파 페르미-전계 효과 트랜지스터를 공급할 수 있는 드리프트 영역을 도입할 수 있다.
Patent KR-20010093155-A (KR)
Title: Compositions comprising 1,1,1,3,3-pentafluorobutane and use of said compositions
IPC: C11D7/24
Filed: 1999-12-10
Abstract: Compositions comprising 1,1,1,3,3-pentafluorobutane and more than 5% by weight of at least one non-flammable fluoro compound, and use thereof.
Patent KR-20020000780-A (KR)
IPC: F25B21/02
Filed: 2000-03-17
Abstract: 복수 단의 열전 모듈을 갖는 열전 매니폴드 등의 열전 장치에 있어서, 흡열면과 방열면의 열 분포를 균일화 시킴으로써 열교환 효율의 향상을 도모하는 것과 함께, 열전 모듈의 열 변형을 억제함과 동시에 만곡된 경우에 있어서도 열전 모듈 간의 열전달이 양호하게 실행되도록 하고 있다. 이를 위해서 복수의 열전 모듈을 구비하는 열전 장치에 있어서, 각각의 열전 모듈의 사이에 열매체로 되는 유체를 개재시켜, 이 유체를 사이에 끼워 냉각측의 열전 모듈의 방열면으로부터 가열측의 열전 모듈의 흡열면으로의 열전달을 실행하고 있다.
Patent KR-20010102578-A (KR)
Title: 크로마토그래피 시험편 및 그의 제조방법
IPC: G01N33/531
Filed: 2001-02-05
Abstract: 본 발명에 따른 크로마토그래피 시험편(10)은 액체 시료가 첨가되는 시료 첨가부(2), 표지 시약을 보유하는 표지물 보유 부위(3), 표지 시약과 분석 대상물의 결합반응이 수행되는 반응층(4), 반응층(4)의 영역중에 특이적 단백질을 보유하는 특이적 단백질 고정화부(5), 및 시료를 흡수하는 흡수부(6)를 포함하고, 여기서 반응층(4)은 건조시 고체로 수득되는 성상의 계면활성제를 포함한다. 
     이러한 구성에 의한 크로마토그래피 시험편(10)은 반응층(4)에서의 침투속도, 침투성 및 침투의 균일화가 향상되므로 측정성능의 향상이 실현될 수 있다.
Patent KR-20020020703-A (KR)
IPC: E02F9/20
Filed: 2001-04-02
Abstract: 시장에서 가동하고 있는 유압셔블(1)에 제어기(2)를 구비하고, 엔진(32), 프론트(15), 선회체(13), 주행체(12)의 각각의 가동시간을 계측하여 그 데이터를 제어기(2)의 메모리에 저장한 후, 위성통신, FD 등을 거쳐 기지국 컴퓨터(3)에 전송하여 기지국 컴퓨터(3)의 데이터베이스(100)에 저장한다.  기지국 컴퓨터(3)에서는 유압 셔블별로 데이터베이스(100)에 저장한 데이터를 판독하여 특정의 유압셔블의 사용상태에 관한 지표(예를 들면 주행비율)와, 이 특정의 유압셔블과 동일 기종의 유압 셔블에 대하여 지표에 대한 가동대수의 분포를 구하고, 양자를 비교하여 특정의 유압셔블이 최적 기종인지의 여부를 판별한다.  이에 의하여 고객이 실제로 기계를 어떻게 사용하고 있는지를 파악하여 평가할 수 있게 되어 사용상태에 따른 최적 기종을 어드바이스할 수 있다.
Patent KR-20020019920-A (KR)
IPC: A61K45/00
Filed: 2001-03-27
Abstract: 본 발명은 매트릭스 메탈로프로테이나제 억제제, 또는 매트릭스 메탈로프로테이나제 억제제와 매트릭스 단백질 생성 항진제를 포함하는 것으로 이루어지는, 인공 피부 형성 촉진제; 및 피부 기저막 안정화제; 및 인공 피부 형성용 배지 중에 매트릭스 메탈로프로테이나제 억제제, 또는 매트릭스 메탈로프로테이나제 억제제와 매트릭스 단백질 생성 항진제를 첨가하는 것을 특징으로 하는 인공 피부의 제조 방법에 관한 것이다.
Patent KR-20020008213-A (KR)
IPC: H01L27/108
Filed: 2000-07-07
Abstract: 본 발명에 따라, 깊은 트렌치 캐패시터를 위한 매립 스트랩의 충진 물질을 에치백하는 방법은, 기판(102)에 트렌치(110)를 형성하는 단계, 제 1 충진 물질(113)로 상기 트렌치를 충진하는 단계, 트렌치에 형성된 유전체 칼라(116)를 기준으로 예정된 깊이로 상기 제 1 충진 물질을 리세싱하는 단계, 유전체 칼라를 에치백함으로써 디보트(105)를 형성하는 단계, 트렌치의 형성에 의해 노출된 기판 부분과 제 1 충진 물질 위로 라이너(132)를 증착하는 단계, 및 라이너 상에 제 2 충진 물질(134)을 증착하는 단계를 포함한다.  제 2 충진 물질의 표면(131)은 수소로 종결된 실리콘 표면을 제공하기 위해 습식 에천트로 표면을 에칭함으로써 마련된다.  제 2 충진 물질의 습식 에칭은 라이너와 기판에 대해 선택적으로 제 2 충진 물질을 에치백함으로써 실시된다.
Patent KR-20020033105-A (KR)
IPC: D06M11/57
Filed: 2000-06-23
Abstract: 본 발명은 담색으로 습윤시의 촉감이 우수하고, 또한 용이하게 소망하는 형상을 부여할 수 있고, 또 그 형상을 강고하게 세트하여 유지할 수 있는 재생 콜라겐 섬유를 제공한다.  또한 열처리시에 발생하는 냄새를 억제할 수 있는 재생 코라겐 섬유를 제공한다. 
     본 발명은 콜라겐을 단관능 에폭시 화합물 및 알루미늄염으로 처리하여 되는 재생 콜라겐 섬유에 관한 것이다. 
     또한, 본 발명은 콜라겐을 단관능 에폭시 화합물로 처리한 후, 산화 알루미늄(Al 2 O 3 )으로 환산하여 2~40중량%의 알루미늄염을 함유시키도록 처리하는 것을 특징으로 하는 재생 콜라겐 섬유의 제조 방법에 관한 것이다.
Patent KR-20030060028-A (KR)
Inventor: LEE SEUNG JUN
IPC: H04L69/40
Filed: 2002-01-05
Abstract: PURPOSE: A method for evading a deadlock using a timer in an HSDPA(High Speed Downlink Packet Access) system is provided to prevent a state that an arbitrary data block, received to a MAC(Medium Access Control) layer in the receiving side of an HSDPA system, cannot be transmitted to an upper layer permanently. CONSTITUTION: A MAC layer in the receiving side of an HSDPA system confirms whether an arbitrary data block is received(S101). If an arbitrary data block is received, the MAC layer judges whether the received data block can be transferred to an upper layer(S103). If it is impossible to transfer the data block to an upper layer, the MAC layer confirms whether a deadlock timer in operation exists(S105). If the deadlock timer exists, the MAC layer stores the received data block in a re-ordering buffer according to the data block's TSN(Transmission Sequence Number)(S107). However, in case that a deadlock timer in operation doesn't exist, the MAC layer activates a deadlock timer for the received data block(S106) and stores the data block in a re-ordering buffer according to the data block's TSN(S107).
Patent KR-20030061203-A (KR)
Inventor: KIM YEONG JUN
IPC: H04N5/232
Filed: 2002-01-11
Abstract: PURPOSE: A remote motion monitoring system is provided to selectively control monitoring cameras through an Internet web to remotely monitor an object and store digital images in a storage medium of a remote terminal using the monitoring cameras. CONSTITUTION: A remote motion monitoring system is composed of a server(10) and a terminal(30) that are operated by an operation system. The server includes a multi-image capturing unit(12) for capturing analog video data inputted from multiple analog monitoring cameras(11) in digital video data, a video memory(13) for temporarily storing the digital video data, a detection controller(15) monitors an object according to a predetermined detection sensitivity condition to send a detection signal to the operation system and storing BMP frame image in a database(16) during the detection, a frame converter(24) for converting the BMP frame into PNG frame, a database manager(17), a WWW server unit(18) and a server communication module(19). The terminal includes a communication module(31) connected to the server communication module, a storage unit(32), a web browser(35), and a search schedule unit(34) for searching the storage unit and the database of the server and transmitting desired detected image files and data.
Patent KR-20030062017-A (KR)
Title: Method and apparatus for compensating fiber optic delay in synchronous mobile communication system using synchronous digital hierarchy
Inventor: HAN GWANG HUI
IPC: H04B10/08
Filed: 2002-01-15
Abstract: PURPOSE: An optical transmission delay compensating method and apparatus in a synchronous mobile communication system using an SDH(Synchronous Digital Hierarchy) transmission are provided to solve a handover due to a distance between a main unit and a remote unit, and transmit a large capacity of signal. CONSTITUTION: An MU(Main Unit)(100) and three RUs(Remote Unit)(200) are connected by an optical transmission line, The RU #1 is closest to the MU(100), while RU #3 is farthest from the MU(100). When an SDH processor(30) and a delay calculator(40) obtain three time delay values due to the optical transmission line according to distances between the MU(100) and each RU #1, #2 and #3, the controller adjusts an output timing of each signal to be transmitted to RUs(200) through a modem(14) in consideration of the time delay values. The controller(12) transmits a pulse signal enabling signals to be transmitted to the RUs #1, #2 and #3(200) in advance before the time delay values of a reference time(150), to the SDH processor(30). Accordingly, the SDH processor(30) transmits signals to corresponding RUs in advance as long as the time delay. Thus, phases of signals transmitted from the RUs(200) are the same.
Patent KR-20030063553-A (KR)
Title: Apparatus and method for manufacturing a urinary drainage container being harmonized with natural environment
Inventor: BOO YOUNG PIL
IPC: B29C65/02
Filed: 2002-01-22
Abstract: PURPOSE: A device and method for manufacturing an environment-friendly urinary drainage bag is provided to seal up the body of the urinary drainage bag and to firmly join a tube to the body. CONSTITUTION: A device for manufacturing a urinary drainage bag is composed of a pneumatic cylinder(32), an upper mold(34a) installed at the lower end of the pneumatic cylinder and having a hemispheric concave unit(34a'), a lower mold(34b) installed at the lower side of the upper mold and having a hemispheric concave unit(34b'), a table(35) installed over the upper end of the lower mold, and an opened unit(35a) formed at the table. The opened unit is larger than the lower mold and the upper mold so that the upper mold is contacted with the lower mold. Heating wires of an electric heater(31) heat the upper mold and the lower mold instantaneously.
Patent KR-20030063616-A (KR)
Title: The Radio microphone transmitter-receiver system which has the muted control function which uses the dual tone cord
Inventor: KIM IN HO
IPC: H04B1/38
Filed: 2002-01-23
Abstract: PURPOSE: A wireless microphone transceiving device having a mute control function using a dual tone code is provided to cancel a mute if a dual tone code of a mute controlling pilot signal transmitted with a voice signal from a wireless microphone transmitting device is the same as a preset code of a wireless microphone receiving device, thereby preventing wrong operations caused by electromagnetic interference. CONSTITUTION: A transmitting device(101) comprises as follows. A dual tone band pass filter(152) band-passes a mute controlling dual tone code signal consisting of two non-audio frequencies generated by being coded in a CPU(151). A control signal size controller(153) controls size of the mute controlling signal, and inputs the mute controlling signal to a frequency modulator(130) in order to perform high frequency modulation with a voice signal. A receiving device has a dual tone decoder. The dual tone decoder separates the mute controlling signal from output signals of a frequency demodulator, extracts a dual tone code, and inputs the signal to a CPU.
Patent KR-20030064023-A (KR)
Title: A contact apparatus for semiconductor test slot
Inventor: KIM JONG HYEON
IPC: H01R33/76
Filed: 2002-01-25
Abstract: PURPOSE: A contact device of a slot for testing a semiconductor is provided to restrain a natural oxide film from growing on a contact point surface of a contact pin and PCB contact pads by sequentially forming contact points between the contact pin and a memory module to be tested. CONSTITUTION: A slot for testing a semiconductor includes a contact pin(10) contacting with contact pads(41) of a main PCB(Printed Circuit Board)(40) to test a memory module(20) inserted through a space part of a slot housing. The contact pin has at least two or more contact points(11,12) protruded to form a plurality of electric contact points with terminal parts(21) of the memory module when the memory module is inserted through the space part. A lower part of the contact pin contacting with the contact pads of the main PCB is curved.
Patent KR-20030064433-A (KR)
Inventor: KWON O DAL
IPC: G02B7/00
Filed: 2002-01-26
Abstract: PURPOSE: A holder and a holder base using a wedge are provided to attach and detach a target easily, and to prevent the target from being shaken after being fixed, and to perform an automated work without an additional sensor. CONSTITUTION: According to the holder(410) fixing both faces of a target, a body(420) comprises a hooking chin formed on the upper side and a projected part which is prolonged from the hooking chin and has a hole. A sliding member(460) is caught to the projected part through an opening formed in the center. A spring is fixed to the body and to the sliding member, and provides the sliding member with a restoring force toward the body. A fixing nail(480) is inserted into the hole of the projected part and has a handle. And a wedge(470) is fixed to the fixing nail through the opening formed on its side wall, and is inserted between the projected part and an inner wall forming the opening of the sliding member.
Patent KR-20030066106-A (KR)
Title: Method for discriminating a type of an optical disc
Inventor: KIM DAE GYU
IPC: G11B19/12
Filed: 2002-02-04
Abstract: PURPOSE: A method for discriminating a kind of an optical disk is provided to accurately discriminate a kind of the optical disk by correcting a reference value to be appropriate for set characteristics. CONSTITUTION: An optical disk is loaded(S10). A microcomputer moves an objective lens of an optical pickup vertically for a predetermined time(S11). The microcomputer calculates a time size between FOK(Focus Okay) signals generated and output by a surface and a recording surface of the optical disk(S12). A kind of the optical disk is discriminated by comparing the detected time size with a reference value stored in a memory(S13). The microcomputer judges as a disk discrimination error if a track fail is generated(S20). The microcomputer corrects the reference value based on a difference between the time size and the reference value(S22). If no track fail is generated, the microcomputer continuously executes the requested operation(S21).