baber/WOPTO huggingface dataset:
Patent KR-20030026151-A (KR)
Inventor: CHO JONG HWA
IPC: B41J3/32
Filed: 2001-09-25
Abstract: PURPOSE: A printer and a printing control method thereof are provided to print braille characters and printed characters on a single sheet of paper. CONSTITUTION: A printer(20) comprises a printed character printer unit(21) for printing character data; a braille character printer unit(22) for converting printed characters into braille characters and printing braille characters; a control unit(23) for controlling the printed character printer unit and the braille character printer unit so as to print both braille characters and printed characters on a single sheet of paper; and an input unit(24) for inputting a mode selection command for selecting a printed character mode for printing characters; a braille character mode for printing braille characters, and a combined mode for printing both braille characters and printed characters. The control unit controls each unit to perform printing in accordance with the selection of mode.
Patent KR-20030028333-A (KR)
Title: A ski amusement machine of indoor
Inventor: JUNG DONG MAN
IPC: A63F9/14
Filed: 2001-09-29
Abstract: PURPOSE: An indoor skiing apparatus is provided to enjoy actual skiing by maximally reviving the speed and actual feeling of skiing. CONSTITUTION: A snowboard(4) is mounted on the feet of a user. A bilateral movement device(6) is mounted on the rear of the user and is formed with an operating part(8) having a connecting part(7). A camera(12), speed measuring device(13), a monitor(14) and an air blower(15) are mounted on the front of the user. A support(16) is mounted at the left and right of the user. A safety belt(17) is mounted to the body of the user. A fixing string(18) is mounted between the support(16) and the safety belt(17).
Patent KR-20030038072-A (KR)
Title: Long wavelength vertical-cavity surface emitting laser having oxide-aperture and method for fabricating the same
Inventor: HAN WON SEOK
IPC: H01S5/183
Filed: 2001-11-08
Abstract: PURPOSE: A VCSEL(Vertical-Cavity Surface Emitting Laser) for long wavelength having a current caliber of an oxide layer is provided to minimize the loss of the current and the charges by using the InAlAs oxide layer for restraining the InAlAs current path layer. CONSTITUTION: An n-type lower mirror layer(120) and an active layer(130) are sequentially formed on an n-type InP substrate(110). The n-type lower mirror layer(120) satisfies a Bragg reflection condition. A current path layer(142) and a current limit layer(144) are formed on a part of the active layer(130). The current path layer(142) is surrounded by the current limit layer(144). A p-type internal resonance contact layer(150) is formed on the current path layer(142) and the current limit layer(144). An upper mirror layer(160) is formed on a part of the p-type internal resonance contact layer(150). A p-type electrode(170) is formed on the p-type internal resonance contact layer(150) and the upper mirror layer(160). An n-type electrode(180) is formed on a part of a back side of the n-type InP substrate(110).
Patent KR-20020036752-A (KR)
Title: Preparations and method of producing the same
Inventor: HIGASHI KIYOTSUGU
IPC: A61K31/51
Filed: 2001-11-09
Abstract: PURPOSE: Provided is a preparation in which a vitamin B1 is stabilized. Particularly the preparation(particularly, a solid preparation) improved in disintegrativity(disintegration properties) as well as stabilization of the vitamin B1. Further provided is a composition for preventing or treating a joint disorder, which comprises a vitamin B1 and an aminosugar(especially, a glucosamine), if necessary, a glycosaminoglycan. CONSTITUTION: The preparation comprising a vitamin B1 comprises an aminosugar in the proportion of not less than 0.1 part by weight relative to 1 part by weight of the vitamin B1, and a composition for treating or preventing a joint disorder composed of a vitamin B1 and an aminosugar, wherein the joint disorder includes arthralgia, arthritis, osteoarthritis, or stiffness.
Patent KR-20030038934-A (KR)
Title: Apparatus for moving scanning carriage in image read-out device
Inventor: KWAK DONG GEUN
IPC: G03G15/04
Filed: 2001-11-09
Abstract: PURPOSE: A scanning carriage transferring device of an image reading apparatus is provided to simplify the structure of a guide rail to facilitate assembling of the transferring device. CONSTITUTION: A scanning carriage transferring device of an image reading apparatus includes the first and second scanning carriages(51,52) and two guide rails. Optical components are mounted on the first and second scanning carriages. The first and second scanning carriages are driven by a driving motor. The two guide rails are parallel with each other and guide the first and second scanning carriages. Each of the guide rails has one sliding face(61,71) on which the first and second scanning carriages slide. The sliding face includes the first lane(61a,71b) on which the first scanning carriage slides and the second lane(61b,71b) on which the second scanning carriage slides.
Patent KR-20030046036-A (KR)
Title: Apparatus for operating acceleration pedal for vehicle
Inventor: SEO JEONG SIK
IPC: B60K26/02
Filed: 2001-12-04
Abstract: PURPOSE: An accelerator pedal operating apparatus for a vehicle is provided to keep the opening degree of a throttle valve accurately and repeatedly, and to obtain the accurate test result without fail by pressing the accelerator pedal with precisely moving an operating shaft forward through a stopper. CONSTITUTION: An accelerator pedal operating system is composed of a shaft driving unit(10) rotating a turning shaft(14) forward by driving an actuator(12) in supplying power, and moving an operating shaft(20) by a connecting member(16) connected to the turning shaft; the operating shaft hinge-combined with the connecting member and moved back and forth; a pedal fixing unit(30) hinge-combined with the end of the operating shaft and fastened in an accelerator pedal(1) to press the accelerator pedal; a fixing support bar(40) having upper and lower fixing support bars(41,42) for telescoping vertically and a guide pipe(47) supporting and guiding backward and forward movement of the operating shaft; and a stopper(50) installed in the operating shaft to adjust the position and fitted to the end of the guide pipe to restrict forward movement of the operating shaft. Test is performed accurately by keeping the opening degree of a throttle valve with pressing the accelerator pedal.
Patent KR-20030052144-A (KR)
Title: An Apparatus for separating sludge from cutting oil
Inventor: KIM GANG HUI
IPC: B24B55/12
Filed: 2001-12-20
Abstract: PURPOSE: A sludge separating apparatus of cutting oil is provided to supply pure cutting oil by automatically separating sludge from cutting oil discharged from a surface grinder with a filter and removing remaining sludge. CONSTITUTION: A sludge separating device of cutting oil comprises a sludge separating container having a filter receiving sludge and cutting oil and discharging only cutting oil; a cutting oil storage container(50) connecting to the discharge part of the sludge separating container and receiving cutting oil; a level detecting sensor(70) detecting the level of cutting oil from the cutting oil storage container; and a pump(60) supplying the cutting oil from the cutting oil storage container. Pure cutting oil is supplied by separating sludge from the cutting oil through the filter.
Patent KR-20030054529-A (KR)
Title: Apparatus for optimizing the loading pressure of sintering layer, using the air velocity sucked into the sintering layer
Inventor: CHOI YEONG SU
IPC: F27B21/08
Filed: 2001-12-26
Abstract: PURPOSE: An apparatus for optimizing negative pressure of sintering layer is provided to operate sintering machine continuously by properly controlling velocity of air sucked into the sintering layer and prevent environmental pollution and improve work environment by reducing dust and noxious gas exhausted from sintering machine. CONSTITUTION: The apparatus comprises an air velocity measuring part(50) comprising an air box installed on the upper surface of sinter pallet car to guide air sucked into the sinter pallet car, air exhaust box connected to the lower part of the air suction box to exhaust air, rotating vane rotationally installed in an inner space of the air exhaust box, and speed sensing sensor connected to rotation shaft of the rotating vane; an apparatus driving part(20) comprising a seesaw type driving base(20c) installed at both side parts of the sinter pallet car to operate the pressing roll and spike roll in seesaw type by fixing the pressing roll and spike roll(40d) according to velocity of air measured in the air velocity measuring part(50), and base driving shaft(20d) connected to driving motor(20h) through gears(20e,20f) with the base driving shaft(20d) being fixed to the lower part of the driving base(20c) to operate the driving base(20c); a sintering layer pressing part(30) comprising pressing roll rotationally installed at side part of one side of the seesaw type driving base(20c) of the apparatus driving part(20), and pressing roll driving motor(30a) axially connected to the pressing roll to rotate the pressing roll; and a sintering layer perforation part(40) comprising spike roll(40d) rotationally installed at the side part of the other side of the seesaw type driving base(20c), and spike roll driving motor(40a) axially connected to the spike roll(40d) to rotate the spike roll(40d).
Patent KR-20030054610-A (KR)
Title: Elastoplastic damper
Inventor: KIM YUN SEOK
IPC: E04H9/02
Filed: 2001-12-26
Abstract: PURPOSE: An elasto-plastic vibration control device is provided to dissipate the stress of an elasto-plastic damper, to improve durability and to resist large transformation. CONSTITUTION: The elasto-plastic vibration control device contains: an ealsto-plastic damper(31) having many S-shaped bends; upper and lower fixed plates(32) fixing both ends of the elastic damper(31) respectively and connected to a structure or a structural member and provided with many inlets(34) to insert both ends of the elastic damper(31); and connectors(33) connected to the upper, lower fixed plates(32) and the structure respectively.
Patent KR-20030054813-A (KR)
Title: A billet descaling apparatus capable of adjusting shot balls injecting position
Inventor: JUNG GWANG SEOP
IPC: B24B5/06
Filed: 2001-12-26
Abstract: PURPOSE: A device for removing scale from a billet is provided to control the injecting position of a shot ball according to the size of the section of the billet having a large section relatively. CONSTITUTION: A distribution case lifting unit is installed at a feeding pipe(4), and lifts a distribution case. An injection case lifting unit lifts the distribution case and an injection case covering the distribution case. A fixing case is installed between the distribution case and the injection case, and covers the distribution case. A through hole is formed at one side of the fixing case corresponding to an injection port in the injection case. An impeller is fixed on the outside of the fixing case.
Patent KR-20030057931-A (KR)
Title: Lamp and methode for fabricating thereof
Inventor: JUNG JAE HO
IPC: H05B41/02
Filed: 2001-12-29
Abstract: PURPOSE: A lamp and a fabricating method thereof are provided to maximize the efficiency of light and obtain the uniform luminance by improving a method for forming electrodes in the lamp. CONSTITUTION: A lamp(100) includes a lamp tube(110), the first electrode(130), and the second electrode(120). The lamp tube includes a predetermined operating gas and a fluorescent material in order to generate the light. The lamp tube has the first region and the second region. The first electrode is formed at the first region of the lamp tube. The second electrode is located around a circumference of the lamp tube at the second region and extended to a center portion of the lamp tube. The thickness of the second electrode is reduced from second region to the center of the lamp tube.
Patent KR-20030058291-A (KR)
Title: Image sensor and method for fabricating the same
Inventor: LEE WON HO
IPC: H01L27/146
Filed: 2001-12-31
Abstract: PURPOSE: An image sensor and a method for manufacturing the same are provided to be capable of restraining defects generated at edges of a field oxide and dark current due to dangling bonds and preventing blooming and crosstalk between unit pixels. CONSTITUTION: A p- epitaxial layer(22) is formed on a p+ substrate(21). A field oxide layer(24) is formed at a desired portion of the p- epitaxial layer(22). A gate electrode(26) having a gate spacer(31) is formed on the p- epitaxial layer. An n- diffusion layer having a channel region is formed in the epitaxial layer to align one edge of the gate electrode(26) and the field oxide layer(24). A p0 diffusion layer(33) is formed in the n- diffusion layer to align one edge of the gate spacer(31). An n+ floating diffusion layer(35) is formed in the epitaxial layer to align the other edge of the gate spacer(31). Charges stored in the n- diffusion layer are transferred to the n+ floating diffusion layer(35).
Patent KR-20020005564-A (KR)
IPC: G10K11/00
Filed: 1999-08-02
Abstract: 본 발명은 산업적 응용을 위한 특별한 열 방출을 위한 고성능 초음파 변환기 배치에 관한 것이다. 
     본 발명의 목적은 고성능 초음파 변환기의 지속적인 작동을 현재까지 알려지지 않은 더욱 효과적인 열 추출로 방출 방지 실행내에서나/와 고습도의 환경내에서 보장하는 열 방출 장치와 관련된 분야를 발전시키기 위해, 실리콘 생고무같은 진동 흡수층 2 와 석영 모래같은 열 추출층 3 을 포함하는 냉각 시스템으로 둘러 쌓인 초음파 변환기 1 를 고안해 내는 것이다.
Patent KR-20010089253-A (KR)
IPC: A61K45/00
Filed: 1999-09-17
Abstract: 본 발명은 FKBP형 이뮤노필린에 대한 친화력을 가지는 분자량이 작은 시클릭 에스터 및 아마이드 유도체, 이를 포함하는 약학적 조성물 및 이를 이용한 신경세포 활성화에 영향을 끼치는 방법에 관한 것이다.
Patent KR-20010075579-A (KR)
IPC: H04N7/26
Filed: 2000-07-31
Abstract: 본 발명은 인코딩 또는 다른 압축 동작 이전에 비디오 신호들의 프로세싱에 관한 것이며, 특히, 2개의 필드 F1 및 F2로 이루어진 각각의 프레임 시퀀스에 대응하는 비디오 신호들을 인코딩하는 방법에 관한 것이다. 상기 제안된 방법은 입력 비디오 신호의 연속적인 프레임들을 수신하고, 적어도 "2개의 필드" 지속 시간을 갖는 프레임들을 지연시키고, 임의의 도미넌스 변화를 검출하여 상기 지연을 조절하는 단계를 포함한다. F1 도미넌스로부터 F2 도미넌스까지의 변화가 검출될 때, 처음의 F2 도미넌트 프레임의 제 1 필드가 억제되고, 지연이 "1 필드" 지속 시간과 동일한 양만큼 감소된다; F2 도미넌스로부터 F1 도미넌스의 변화가 검출될 때, 제 1 F2 도미넌트 프레임의 제 1 필드가 억제되고, 상기 지연이 "1 필드" 지속 시간과 동일한 양만큼 감소되고; F2 도미넌스로부터 F1 도미넌스까지의 변화가 검출될 때, 마지막 F2 도미넌트 프레임의 마지막 필드가 반복되고, "1 필드" 지속 시간과 동일한 양만큼 지연이 더 증가한다. 본 발명은 또한, 비디오형 이미지 또는 필름형 이미지를 포함하는 프레임들의 시퀀스를 인코딩하는 방법 및 본 명세서상에 나타난 제 1 해결법을 통합하여 상기 방법을 실행하는 인코딩 시스템에 관한 것이다. 필름형의 시퀀스가 검출되면, 역 3:3 풀다운 기법이 입력 프레임에 적용되고, 반대의 경우, 상기 기법이 비활성화되고 상기 제 1 해결법에 의해 대체되고; 도미넌스 변화의 형태에 따라 전처리한다.
Patent KR-20010106507-A (KR)
IPC: C09C3/12
Filed: 1998-10-08
Abstract: 중량 평균 분자량이 1500 이상이고 중합체 주쇄 2 내지 97 중량% 및 주쇄에 부착된 거대단량체 측쇄 97 내지 2 중량%를 가지며 주쇄, 거대단량체, 또는 주쇄 및 거대단량체 모두에 부착된 이미드 또는 우레아 관능성 분산 치환체 약 1 중량% 이상을 갖는 아크릴계 그라프트 공중합체 기재의 중합성 안료 분산제.
Patent KR-20010080229-A (KR)
IPC: F02M37/00
Filed: 1999-10-04
Abstract: 엔진은 연료를 연소실 (16) 으로 직접 분사하기 위한 연료분사밸브 (40) 을 구비한다.     연료공급장치는 공급펌프 (46) 및 부스터펌프 (47) 을 구비한다.     부스터펌프 (47) 은 미리 정해진 압력 하에서 공급펌프 (46) 으로부터 공급된 연료를 가압하고 이 연료를 연료분사밸브 (40) 으로 공급한다.     부스터펌프 (47) 에 이상이 발생하는 때, 부스터펌프 (47) 의 구동은 정지하여 연료분사밸브 (40) 은 공급펌프 (46) 으로부터 공급된 연료로 연료분사를 수행한다.     부스터펌프 (47) 의 구동이 정지된 때에는, 연료분사밸브 (40) 의 구동 또는 연소실 (16) 으로 흡입되는 공기량이 제한되어 실화를 유발하지 않는 혼합기만이 연소실 (16) 내에 형성된다.     그러므로, 실화를 유발하는 혼합기는 연소실 (16) 내에 형성되지 않고, 연소실 (16) 내의 혼합기는 점화되고 연소되지 않은 혼합기는 연소실 (16) 으로부터 방출되지 않는다.
Patent KR-20010090832-A (KR)
IPC: A01G31/00
Filed: 1999-11-05
Abstract: 칼슘 이온 흡수량이 건조 중량 1g당 0∼100mg이며 ; 염소 이온의 함유량이 건조 중량 LG당 0.07∼7mmo1 이고 ; 또한, 25에서의 이온 교환 수중에서의 흡수 배율이 l.0×10 1 ∼1.0×10 8 배인 하이드로 겔 형성성의 고분자(A)로 이루어지는 식물 보수용 담체; 또는 상기 고분자(A)와 식물체 육성용 담체와의 혼합물의 성형체로 이루어지는 식물체 육성용 보수재. 양호한 보수성을 가지고, 또한 발근 저해 내지는 뿌리의 신장 저해를 실질적으로 일으키지 않는 식물 보수용 담체 및 식물체 육성용 보수재이다.
Patent KR-20010080706-A (KR)
IPC: G06F13/362
Filed: 1999-12-01
Abstract: 본 발명은 멀티마스터 버스 시스템 및 그의 작동 방법에 관한 것이다.  본 발명은 동적으로 변경 가능한 디폴트 마스터 결정을 특징으로 한다.  이로 인해 버스 시스템은 모든 상황에서 각 조건에 최상으로 매칭될 수 있다.  상기 버스 시스템을 포함하는 시스템은 최상으로 신속하고 효율적으로 작동될 수 있다.
Patent KR-20010104696-A (KR)
IPC: B22F9/24
Filed: 2000-11-10
Abstract: 본 발명은 SEM 관찰에 의한 평균 입자 직경의 1.2 배 이상의 입자 직경을 가진 입자의 수가 전 입자수의 5% 이하이고, 이 평균 입자 직경의 0.8 배 이하의 입자 직경을 가진 입자의 수가 전 입자수의 5% 이하이며, 게다가 탭 밀도가 2.5g/㎤ 이상인 것을 특징으로 하는 니켈 분말, 및 적층 세라믹 콘덴서용 도전 페이스트이고, 본 발명의 니켈 분말은 좁은 입도 분포 및 도전 페이스트 중에서의 우수한 충진성을 가지며, 특히 크랙이나 라미네이션의 발생이 없이 적층 세라믹 콘덴서의 얇고 균질한 내부 전극을 형성하는 데에 적합하다.
Patent KR-20010101693-A (KR)
Title: 가상 메모리 시스템에서의 메모리 접근 개선 기술
IPC: G06F12/10
Filed: 2000-01-27
Abstract: 본 발명에 따라, 메모리 접근 호출시간을 감소시키기 위한 방법 및 장치가 공개된다. 새 엔트리가 우선 변환 참조 버퍼(110)로 만들어질 때, 새 TLB 엔트리는 메모리(108)의 상응하는 TLB 페이지를 가리킨다. TLB(110)의 갱신과 동시에, TLB 페이지 캐시(114)에 TLB 페이지를 저장함으로서 TLB 페이지는 시간상으로 프로세서(102)에 가깝게 이동한다. TLB 페이지 캐시(114)는 메인 메모리(108)보다 프로세서(102)에 시간상으로 가깝다.
Patent KR-20020010600-A (KR)
Inventor: OPPENLAENDER KNUT
IPC: C10M133/58
Filed: 2000-03-28
Abstract: The invention relates to polyalkene alcohol polyetheramines of formula R1-(CH2)n-O-A)m-NR2R3, wherein R1 represents a polyalkene radical derived from C2- to C30-alkenes with a number average molecular weight of 300 to 5000, R2 and R3 each mean, independently of each other, hydrogen or organic radicals with a total of 400 carbon atoms. A denotes alkylene groups with 2 to 8 C atoms, m is a number from 1 to 200 and n denotes the number 0 or 1. The inventive polyalkene alcohol polyetheramines are suitable for use as carrier oils, detergents and dispersing agents in fuel and lubricant compositions.
Patent KR-20020024590-A (KR)
Title: Motor-pump unit
IPC: F04C11/00
Filed: 2001-03-23
Abstract: A motor-pump unit including an electric motor and a pump. The pump is concentrically surrounded by the rotor/stator of the motor. The rotor of the electric motor is U-shaped, viewed in an axial section. The cross-piece of the "U", in the region of the common axis, is provided with an interior toothing. The shaft of the pump includes a pinion that meshes with the interior toothing of the cross-piece of the "U".
Patent KR-20030061168-A (KR)
Title: Apparatus for Painting Adhesive on Tread Edge
Inventor: LEE GAP BAE
IPC: B05C1/08
Filed: 2002-01-11
Abstract: PURPOSE: Provided is an adhesive applicator for tread edge, which has a roller on the top of cylinder, and thus can precisely apply an adhesive on tread edge and improve the quality of article. CONSTITUTION: The applicator comprises a cylinder(10) which operates upward and downward, and is positioned at lower part of tread transport roller(TR); a roller(20) which is positioned at the top of the cylinder(10), operates in conformity with upward and downward operation of the cylinder(10); a spray gun(30) which is positioned at position of descended roller(20); a controller(40) for controlling the cylinder(10) and the spray gun(30).
Patent KR-20030063498-A (KR)
Inventor: CHOI HUI JUN
IPC: H02B13/035
Filed: 2002-01-22
Abstract: PURPOSE: A structure for unifying earthing switch units of gas insulated switchgear is provided to reduce a total size and a manufacturing cost by installing a linear ES(Earthing Switch) and a bus DS/ES unit within one insulating tank. CONSTITUTION: A gas insulator switchgear includes a linear ES unit and a bus DS/ES unit. The linear ES unit is used for connecting a line to an earth portion by the first ES assembly(13) installed within an insulating tank(20) when an abnormal voltage is generated or a mending process is performed. The bus DS/ES is connected to the linear ES unit through a conductor(22) in order to connect a disconnecting switch(23) to the earth portion by the second ES assembly(24). The linear ES unit is included within the bus DS/ES unit since the first ES assembly of the linear ES unit is connected to a lower portion of the conductor of the bus DS/ES unit in order to connect the line to the earth portion.
Patent KR-20030063788-A (KR)
Title: Improved pulverizing means of rotating and shearing type crusher
Inventor: AHN TAE YEONG
IPC: B02C18/22
Filed: 2002-01-24
Abstract: PURPOSE: A crusher provided in a rotation shearing type crushing apparatus is provided to enable food materials to be crushed to be smoothly transferred without stoppage even if the amount of the food materials exceeds the transfer capacity of a transfer screw. CONSTITUTION: The crusher for a rotation shearing type crushing apparatus comprises a housing formed with an input hopper, a speed reduction motor, a transfer screw, an angled rotating shaft, a plurality of fixed and rotating plates alternately arranged on the rotating shaft, an extrusion die located at the side of the housing by interposing an adjustment ring, and an agitation blades located next to the last fixed plate. A circular body(211) of one of the rotating plates is formed at the outer peripheral surface with a cutting unit(212) having front and rear surfaces(212a,212b) and both side surfaces(212c,212d). The front surface is in perpendicular to the center axis of the rotating plate, and is cut by a certain depth so as to form a stepped portion. The one of the side surfaces is inclined downward relative to the rotating direction of the rotating plate by a certain angle. Each of the fixed plate is formed with a plurality of recesses(223) at the rear surface.
Patent KR-20030035738-A (KR)
Title: Electrode equipment for artificial retinal implant and its fabricating method
Inventor: KIM HYO GYEOM
IPC: A61F9/00
Filed: 2002-01-24
Abstract: PURPOSE: An electrode structure for an artificial retina prosthetic appliance and a method of making the same are provided which are excellent in adherence to an eyeball, cause an electrode to be less crumpled and distorted upon being fixed to the eyeball and minimize the damage of retinal tissue. CONSTITUTION: A lower insulating layer has corner and side portions each being curved. A plurality of electrode patterns(304a) are formed on the lower insulating layer at a predetermined interval. An upper insulating layer(305) serves to insulate between the plurality of electrode patterns. A fixing hole(307b) fixes an electrode structure to a retina. A fixing hole cognitive pattern(304b) is formed along the circumference of the fixing hole. A plurality of perforations(307a) serve as an outlet for smooth humoral circulation around the retina.
Patent KR-20030064062-A (KR)
Title: Optical pick-up
Inventor: LEE MAN HYEONG
IPC: G11B7/1365
Filed: 2002-01-25
Abstract: PURPOSE: An optical pick-up unit is provided to irradiate annular-polarized beam onto a disk to reduce birefringence of the disk and construct an optical system using a polarized beam splitter. CONSTITUTION: An optical unit includes a polarized phase compensator(108), a phase plate(109), an objective lens(110), a light-receiving part(113), a polarized beam splitter(106), and a compensation lens(112). The polarized phase compensator is formed in a manner that a birefringence medium and an isotropic medium are combined with each other and controls an optical path of a transmitted beam. The phase plate converts a received straight-polarized beam into an annular-polarized beam and converts an annular-polarized beam reflected from a disk into a straight-polarized beam. The objective lens focuses the annular-polarized beam inputted from the phase plate on a disk suitable for the wavelength of the beam. The light-receiving part receives the beam reflected from the disk to detect a signal recorded in the disk. The polarized beam splitter inputs the straight-polarized beam that has been reflected from the disk and then transmitted the phase plate into the light-receiving part. The compensation lens is placed between the light-receiving part and the polarized beam splitter and corrects spherical aberration of the beam that has passed the polarized beam splitter to condense the beam to the light-receiving part.