baber/WOPTO huggingface dataset:
Patent KR-20030033430-A (KR)
Title: Spray hose
Inventor: KIM CHANG HUN
IPC: A01G25/00
Filed: 2001-10-22
Abstract: PURPOSE: A sprinkler hose is provided to keep balance of growth by preventing lowering of the growth of crops at both sides of a vinyl house with forming more jet holes in a right body than a left body and installing the right body for both sides of the vinyl house. CONSTITUTION: Plural ejection holes(130) are arranged in a left body(120) around the central line of a sprinkler hose(100), and plural ejection holes are formed in a right body(110). Ejection holes of the left body are formed to be more than ejection holes of the right body, and water is ejected from the ejection holes. The total amount of water from ejection holes of the left body is less than the total amount of water from ejection holes of the right body. The right body is installed for both sides of the vinyl house, and the growth of crops is promoted at both sides of the vinyl house. Crops grow evenly without imbalance in the vinyl house.
Patent KR-20030037827-A (KR)
Title: Liquid crystal gel cosmetic composition for whitening containing 5,15-diacetyl-3-benzoyllathyrol
Inventor: HONG SEUNG GI
IPC: A61K8/49
Filed: 2001-11-06
Abstract: PURPOSE: A liquid crystal gel cosmetic composition for skin whitening, containing 5,15-diacetyl-3-benzoyllathyrol is provided which is excellent in percutaneous absorption, stability, skin whitening effect, etc. CONSTITUTION: The liquid gel cosmetic composition for skin whitening comprises 50 to 80% by weight of propylene glycol, 20 to 40% by weight of a mixture containing ceramide, a non-ionic surfactant, cetostearyl alcohol, cholesterol and oil in a ratio of 2 to 3:1 to 3:2 to 4:4 to 6:5 to 7 and 0.00001 to 10% by weight of 5,15-diacetyl-3-benzoyllathyrol.
Patent KR-20020035766-A (KR)
Inventor: BOECKING FRIEDRICH
IPC: F02M57/02
Filed: 2001-11-07
Abstract: PURPOSE: An injector having a separable pressure multiplier is provided to cut down manufacturing expenses, and to simplify the structure by forming the tolerance between pistons forming two pistons in the pressure chamber. CONSTITUTION: A control valve(3) controls a first supply unit(12) with a control chamber(13), and an injector having the control valve injects high pressure fuel to a combustion chamber of an engine. A pressure booster is moved in an injector housing(2), and pressure is supplied to the pressure booster with the control chamber. The pressure booster is composed of pistons(14,22), and pistons are axially extended to each other. Expenses are reduced with simplifying the structure.
Patent KR-20030040771-A (KR)
Title: Glaze composition for metallic tile using thereof and Preparing method
Inventor: LEE YONG JAE
IPC: C03C8/18
Filed: 2001-11-16
Abstract: PURPOSE: Provided is a manufacturing method of metallic tiles which have the same feeling as a metal, low cost, and high durability and corrosion-resistance by applying a glaze made of metallic powder to the glazed ceramic tiles. CONSTITUTION: The metallic glaze composition comprises 20-80wt.% of metallic powder, 20-80wt.% of borosilicate such as sodium, lead and kalium borosilicate glass, and 3-10wt.% of organic binder. The metallic powder contains 1-3wt.% of Al, 5-20wt.% of Fe, 10-50wt.% of Pb, 20-40wt.% of O, 5-20wt.% of Si, 0.1-0.5wt.% of Mo, 0.1-0.5wt.% of Ti, 0.1-0.5wt.% of Cu, 1-5wt.% of K, 1-4wt.% of Cl, 0.1-0.5wt.% of Ni and 0.1-0.5wt.% of Co. The metallic tiles are manufactured by the following steps of: applying a glaze to the surfaces of ceramic tiles; re-applying a metallic glaze to the glazed surfaces of the tiles, wherein, the ceramic tiles are heated to 50-200deg.C and then 0.5-3.0g of metallic glaze is spread over the glazed tiles; sintering tiles at 800-900deg.C for 1-3hrs.
Patent KR-20030048641-A (KR)
Inventor: KIM YANG GYU
IPC: F25D11/00
Filed: 2001-12-12
Abstract: PURPOSE: A direct cooling type refrigerator is provided to optimally cope with the variation of insulation load by adjusting the amount of cold air flowing from a freezer to a refrigerator compartment. CONSTITUTION: A direct cooling type refrigerator comprises a body(11) forming a cooling space inside, a barrier tray(31) arranged inside the body to be separated and attached and to divide the cooling space into a freezer compartment(13) and a refrigerator compartment(14) with having at least one communicating hole(32) mutually communicating the freezer compartment and the refrigerator compartment, and an opening control member(33) combined to the communicating hole to the opening of the communicating hole.
Patent KR-20030049664-A (KR)
Title: sensor of washing equipment for Semiconductor devices fabricating, sensing instrument administration system using the same and manufacturing method there of
Inventor: KO SEUNG JAE
IPC: H01L21/02
Filed: 2001-12-17
Abstract: PURPOSE: A sensor of a cleaning equipment for manufacturing a semiconductor device, a sensing management system using the same and a method for manufacturing the sensor are provided to be capable of detecting the corrosion and damage of a sensing device in real time by using a leak sensing device. CONSTITUTION: A sensor(20a) is provided with a sensing device(22) for generating a sensing signal of the state corresponding to the contact with a cleaning solution and supplying the sensing signal through a sensor cable(24) to a controller, a leak sensing device(28a) installed near to the sensing device(22) for supplying an electric signal through a leak sensor cable(30) to the controller, and a coating layer(32) for selectively covering the sensing and leak sensing device. At this time, the damage of the sensing device is capable of being detected by the electric signal of the leak sensing device.
Patent KR-20030052566-A (KR)
Title: Control method for automatic menu performance of operation and maintenance system of exchanger
Inventor: KIM CHEOL HO
IPC: H04M3/42
Filed: 2001-12-21
Abstract: PURPOSE: A method for automatically controlling menu execution in an operation and maintenance system of an exchange is provided to edit and store menus in an operation and maintenance program, and to automatically search menus containing items to be set to display the menus, thereby enabling an operator to easily set operation data. CONSTITUTION: When operation data setup starts(S201), an exchange confirms whether an operator selects a specific menu item(S202). If so, the exchange displays the menu item on a GUI screen(S203), and sets an input value to be set on the displayed menu item(S204). If other menu item setup is completed(S205), the exchange completes the operation data setup(S206). A setup file is performed(S207), and the operator selects one of many menu items, then an operation program finds out similar menu items(S208). The found menu items are displayed on the GUI screen(S209). The exchange sets input values for the menu items(S210). If the menu items are not completed, the exchange finds out menu items supplied from the operation program, and completes the menu item setup(S211). The data setup is completed(S206).
Patent KR-20030055046-A (KR)
Title: outdoor units piling devide of multi air conditioner
Inventor: CHOI JAE SEON
IPC: F24F5/00
Filed: 2001-12-26
Abstract: PURPOSE: An installation platform of an outdoor unit of a multi air conditioner is provided to reduce installation space of the outdoor unit by allowing outdoor units of the air conditioners to be piled on each other. CONSTITUTION: An upper outdoor unit is mounted on installation platforms(40) placed on an upper side of a lower outdoor unit. A pair of the installation platforms are mounted on an upper side of an upper panel of the lower outdoor unit. The installation platform comprises a plate body part(41) extending to front side and rear side; and bent parts(42) bent downward from both ends of the plate body part to cover the upper panel of the lower outdoor unit, and coupled to a front panel and a lower panel of the lower outdoor unit installed on a lower side of the upper outdoor unit by bolts(43a) inserted to penetrating holes(43) formed on the bent parts. A vibration reducing member, a vibration absorbing rubber(50), is installed on a lower side of the plate body part to reduce vibration of the lower outdoor unit and an upper outdoor unit. Guides(44) are bent down from longitudinal sides of the plate body part to prevent free movement of the vibration reducing member.
Patent KR-20030055819-A (KR)
Title: Combination structure of yoke and frame for speaker
Inventor: CHO SEONG IL
IPC: H04R9/02
Filed: 2001-12-27
Abstract: PURPOSE: A combined structure of a yoke and a frame for a speaker is provided to reduce the weight of the speaker by changing the shape of the yoke, and to increase a bonding force by coking or bold connection between the yoke and the frame. CONSTITUTION: The speaker includes a magnet(3), a pole piece(4), a voice coil(6), a vibration plate(7) and a damper(8). A circular yoke comprises a space part(111) on its center, and has a wing part(113) where a plurality of connection projections(115) are formed on its top plane, and has a supporting plate(117) bent upward from the inner bottom of the space part. A frame(120) has a connection hole(121) formed on a location corresponding to the connection hole formed in the wing part of the yoke. The magnet and the pole piece are stacked on the supporting plate of the yoke in sequence, and the connection projection of the yoke is connected to the connection hole of the frame and then is coked.
Patent KR-20020055436-A (KR)
Inventor: FUJITA AKIRA
IPC: G02F1/1368
Filed: 2001-12-28
Abstract: PURPOSE: To suppress the occurrence of Al hillock and to reduce connection resistance so as to improve the reliability of the connecting section without complicating the structures of the wiring of scanning and signal lines formed on an active matrix substrate. CONSTITUTION: The active matrix type liquid crystal display device includes an active matrix substrate 1 having a transparent insulated substrate 10 on which a thin film transistor 14 and a pixel section 13 are formed. A gate electrode 15 of the transistor 14 and a scanning line 11 connected to the electrode 15 have a TiN/Ti/Al structure or a TiN/Al/Ti structure or a TiN/Ti/Al/Ti structure. Since a Ti film exists in contact with an Al film, the generation of Al hillock at the Al film is suppressed. Having the TiN layer at a top layer, surface corrosion at a scanning line terminal section 22 is suppressed, the increase in the connecting resistance at the section 22 is suppressed and the reliability is increased.
Patent KR-20030058722-A (KR)
Title: Lcd by using plastic substrate
Inventor: KIM HYANG YUL
IPC: G02F1/1333
Filed: 2001-12-31
Abstract: PURPOSE: A liquid crystal display using a plastic substrate is provided to uniformly coat an alignment film, realize uniform rubbing, and form a uniform cell gap, thereby improving the brightness characteristic of the liquid crystal display. CONSTITUTION: Upper and lower plastic substrates(20) have grooves on the edges respectively. Auxiliary substrates(60) support the upper plastic substrate and the lower plastic substrate. A thermal stability fixing tape(70) is used for fixing the upper plastic substrate and the lower plastic substrate on the auxiliary substrates. A vacuum pressure is applied to fix the plastic substrates and the auxiliary substrates on a process table(10). An alignment agent is coated on the plastic substrates by using the off-set printing method using a transfer plate(30). The alignment film is rubbed in a uniform degree of friction. The upper plastic substrate and the lower plastic substrate are bonded with each other, and liquid crystal is injected between the plastic substrates.
Patent KR-20010074874-A (KR)
Title: 필름-형성 중합체를 함유하는 마스카라
IPC: C08L91/06
Filed: 2000-06-20
Abstract: 본 발명은 양이온성 중합체, 음이온성 중합체 및 C 1 -C 6 알킬 (메트)아크릴레이트의 수성 분산액을 함유하는 케라틴 섬유를 코팅하기 위한 화장용 조성물에 관한 것이다. 
     또한 본 발명은 조성물을 케라틴 섬유에 도포하는 것으로 이루어지는 케라틴 섬유를 코팅하기 위한 방법에 관한 것이다. 
     이러한 조성물은 속눈썹을 코팅하고 길어지게 하며 컬링하는 양호한 성질뿐만 아니라 양호한 지속력을 갖는 균일한 메이크업 결과에 신속하게 이르게 한다.
Patent KR-20010087372-A (KR)
IPC: G02F1/137
Filed: 1999-02-10
Abstract: 본 발명은 호스트 매트릭스 및 게스트 염료로 형성된 편광자를 제공한다. 호스트 매트릭스는 소정의 배향을 보유한 액방성 액정 매트릭스일 수 있다. 게스트 다색 염료는 호스트 액방성 액정 매트릭스내에 배치할 수 있다. 게스트 다색 염료는 호스트 매트릭스의 방향으로 배향된다.
Patent KR-20010113638-A (KR)
IPC: H04L12/28
Filed: 2000-09-28
Abstract: 저 전력 무선 네트워크는 루팅 테이블(20)을 구비한 네트워크 책임성 무선 디바이스(10)와, 상기 네트워크 책임성 무선 디바이스(10)에 의해 상기 네트워크의 일원으로서 열거된, 복수의 슬레이브 무선 디바이스(SL1 내지 SL6)를 포함한다. 새로운 슬레이브 디바이스는 상기 네트워크 책임성 무선 디바이스(10)에 의해 전송된 주기적(periodic) 기준 신호를 검출하여  상기 무선 네트워크의 일원이 되기 위해 상기 열거 프로세스를 자동적으로 개시하는 상기 슬레이브 무선 디바이스에 의해 열거된다. 네트워크 보안을 위하여, 상기 네트워크 책임성 무선 디바이스는, 사용자에 의해 인에이블 되지 않으면, 인에이블 요청에 대한 수용이 금해진다.
Patent KR-20010100046-A (KR)
Title: 전류 전달을 위한 개선된 마모 성능을 갖는 저 저항률재료 및 이를 제조하는 방법
IPC: H01R43/12
Filed: 1999-12-16
Abstract: 레일 시스템용 브러쉬, 수위치 및 점점 재료와 같은 분야 및 기타 산업용 장치에 적합한 구리 흑연 조성물, 상기 조성물은 다수의 기공이 흑연을 함유하는 구리 망상 매트릭스로 구성된다.  조성물은 적어도 40%의 LACS 값을 가지며 오히려 70%이상일 수 있고 적어도 6.0g/㎤의 밀도 값을 갖는다.  조성물의 제조방법은 비 산화조건하에서 구리 분말과 흑연 분말을 혼합하는 단계와, 혼합물을 압축하는 단계와, 비산화 조건하에서 소결하는 단계로 구성된다.
Patent KR-20020016777-A (KR)
IPC: G06F17/14
Filed: 2000-04-28
Abstract: 본 발명은 신호를 나타내는 함수의 계수들이 결정되는 대기 시간을 줄일 수 있는 장치, 방법 및 컴퓨터 프로그램 프로덕트를 제공한다.  특히, 샘플의 독립성을 이용하는 본 발명의 장치, 방법 및 컴퓨터 프로그램 프로덕트는 각각의 샘플이 수신됨에 따라 상기 함수의 각 계수들을 갱신한다.  이로써, 최종 샘플이 수신되면, 본 발명의 장치, 방법 및 컴퓨터 프로그램 프로덕트는 상기 계수들이 출력되기 전에 상기 최종 샘플의 기여로 각각의 계수를 갱신하는 과정만을 필요로 한다.  이로써, 상기 최종 샘플이 수신되는 시간으로부터의 대기 시간 및 상기 계수의 이용가능도가 줄어든다.  상기 대기 시간을 추가로 감소시키기 위해, 일 실시예에 따르면, 본 발명의 장치, 방법 및 컴퓨터 프로그램 프로덕트는 각각의 계수에 대한 샘플의 기여의 모든 가능한 값들 또는 그 일부값을 예비 저장한다.  이로써, 상기 샘플이 수신되면, 본 발명의 장치, 방법 및 컴퓨터 프로그램 프로덕트는 상기 샘플의 값을 평가하고 상기 계수, 샘플 및 상기 샘플값에 해당하는 상기 예비 저장값으로부터 적절한 값을 검색함으로써, 상기 계수를 결정하는데 필요한 시간을 줄일 수 있다.  본 발명의 장치, 방법 및 컴퓨터 프로그램 프로덕트는 또한, 상기 계수들의 각각의 계수 원소 또는 그 부분 집합이 관찰되는 것을 가능하게 해줌은 물론, 상기 계수들의 각각의 계수 원소 또는 그 부분 집합이 다양한 리솔루션으로 결정되는 것을 가능하게 해준다.
Patent KR-20020013533-A (KR)
IPC: A61P15/10
Filed: 2000-05-04
Abstract: Androgen glycosides provide free, circulatory androgen on oral administration as they are subject to less, first pass breakdown by the liver.
Patent KR-20020040687-A (KR)
IPC: A61K8/49
Filed: 2000-06-27
Abstract: 본 발명에 따라 하기를 포함하는 화장 방법이 제공된다: 
     (i) 하기를 함유하는 조성물을 피부에 적용하는 단계: 
     (a) 하나 이상의 4차 암모늄 제제; 및 
     (b) 습윤제; 및 
     (ii) 피부를 헹구는 단계. 
     본 발명의 방법은 미끈거림, 끈적임 또는 점착성 등의 부정적 측면은 낮은 수준으로 하여, 양호한 피부 케어 효과, 예컨대 양호한 보습성, 양호한 수화성, 양호한 피부 감촉, 양호한 피부 부드러움 및/또는 양호한 매끄러움을 제공한다.
Patent KR-20030061211-A (KR)
Title: Multilayered varistor
Inventor: PARK JIN CHAE
IPC: H01C7/10
Filed: 2002-01-11
Abstract: PURPOSE: A stack-type varistor is provided to prevent a pattern from being shorted irrespective of a print accuracy when reducing a width of a pattern of an inner electrode and adding a pattern in a length direction. CONSTITUTION: A plurality of pattern sheets(110,120,130) having inner electrode patterns(112,112',122,132,132') are stacked. Support layers(100,102) are installed at upper and lower surfaces of the stacked structure of the pattern sheets. Outer electrodes are connected to both ends of a stack-type varistor. The inner electrode patterns are diverged and connected in parallel in the pattern sheet to form a capacitor. The diverged inner electrode patterns are united to be electrically contact with the outer electrodes.
Patent KR-20030061553-A (KR)
Title: Mehtod and apparatus for driving data of liquid crystal display
Inventor: LEE SEOK U
IPC: G02F1/133
Filed: 2002-01-14
Abstract: PURPOSE: An apparatus and a method for driving data of a liquid crystal display are provided to increase the number of channels of a data driving integrated circuit while reducing a chip area not increasing the chip area, thereby reducing the manufacturing cost of the liquid crystal display. CONSTITUTION: A multiplexer part(38) is provided to time-divide input pixel data(VD) and supply the time-divided input pixel data. A DAC(Digital to Analog Converter) part(40) converts the pixel data received from the multiplexer part into pixel voltage signals. A demultiplexer part(42) selectively supplies the pixel voltage signals received from the DAC part to a plurality of output lines. A sampling and holding part(44) samples and holds the pixel voltage signals received from the demultiplexer part for outputting to a plurality of data lines(DL1-DL2n).
Patent KR-20030062649-A (KR)
Title: Apparatus for controlling open and close of a Electronic Valve and Method therefor
Inventor: PARK KWANG HEE
IPC: F16K31/02
Filed: 2002-01-18
Abstract: PURPOSE: A driving voltage and a maintaining voltage applied to a valve coil is divided into a rating voltage and a low voltage, thereby saving electric energy. CONSTITUTION: An electronic valve is provided to open and close a valve by generating a magnetic field by a voltage applied from outside. A rating voltage generating portion(70) supplies a rating voltage to the valve coil when opening the valve. A low voltage generating portion(80) applies lower voltage to the valve coil to maintain the open state of the valve. A controller(90) controls selectively the rating voltage generating portion and the low voltage generating portion.
Patent KR-20030064122-A (KR)
Title: A phosphor block and a method of its preparation
Inventor: LEE MIN SANG
IPC: C04B26/02
Filed: 2002-01-25
Abstract: PURPOSE: A fluorescent artificial stone composition and its preparation method are provided, to improve the luminance intensity and to enable the color to be controlled and varied by employing various pigments and dyes. CONSTITUTION: The fluorescent artificial stone composition comprises a substrate(10) and a luminescent part formed on the substrate in intaglio, wherein prominence and depression are formed under the luminescent part and at least some part of the luminescent part is a luminescent layer(30) containing a fluorescent substance. The luminescent layer is made from a slurry mixture comprising 1.0-60 wt% of a fluorescent substance, 10-70 wt% of a resin and 5-60 wt% of a curing agent. Preferably the fluorescent substance is at least one selected from the group consisting of an oxide-based fluorescent substance and a sulfide-based fluorescent substance; and the resin is selected from the group consisting of epoxy resin, methacryl resin, phenol resin, melamine resin, acryl rein, silicone resin, furan resin, urea resin, diallyl phthalate resin, petroleum resin, fluorocarbon resin, polyurethane resin and polyester resin.
Patent KR-20030065961-A (KR)
Title: Block with grooves having tree structure and multicore optical fiber block using it and method for aligning the multicore optical fiber block
Inventor: JUNG BYEONG GIL
IPC: G02B6/38
Filed: 2002-02-02
Abstract: PURPOSE: A block comprising grooves in a tree structure, and a multi-core optical fiber block using the same and an arrangement method thereof are provided, which minimizes bending of an optical fiber generated during an arrangement process. CONSTITUTION: According to a block which comprises grooves on its upper surface and where optical fiber columns are placed on the grooves, the grooves comprises the first sub grooves(342) whose length and width are reduced as going to an output side from an input side of the block. And the second sub grooves(344) are formed between the first grooves, and their width and length are increased as going to the output side from the input side of the block.
Patent KR-20020066199-A (KR)
Title: Laser processing method and apparatus
Inventor: ITO HIROSHI
IPC: B23K26/06
Filed: 2002-02-07
Abstract: PURPOSE: A laser processing method and apparatus are provided to produce a polycrystalline silicon film with a uniform and large particle diameter by high throughput. CONSTITUTION: A variable attenuator(12), an illuminative optical system(13), a mask(14), and a mirror(15) are disposed on the optical path of a pulse laser. A laser processing method irradiates the mask with a plurality of openings formed therein with the pulse laser, and irradiates a plurality of portions of a work to be processed with the pulse laser transmitted through the plurality of openings at the same time. The method comprises moving the mask and the work with respect to each other and emitting the pulse laser a plurality of times. The method sets a relation between a relative movement speed of the mask and the work and an emission timing of the pulse laser such that respective laser irradiated regions disposed adjacent to one another on the work are formed by irradiation with the pulse laser transmitted through the openings formed in positions different from one another on the mask. Boundaries of the laser irradiated regions disposed adjacent to each other contact at least each other.
Patent KR-20030069729-A (KR)
Title: Method for routing packet date in mobile communication system
Inventor: LEE DONG YEOL
IPC: H04W92/14
Filed: 2002-02-22
Abstract: PURPOSE: A method for routing packet data of an MS(Mobile Station) in a mobile communication system is provided to register a packet data service in the MS and a private network, thereby receiving the packet data service of a public network or the private network. CONSTITUTION: A private network registers a mode of an MS in a private functional table as a private packet data service(401), and checks whether a message is inputted through a BTS from the MS(403). If so, a private BTMR(Base Transceiver Station Message Router) checks whether a packet data service of the MS is registered in the private functional table(405). If so, the private network transmits a packet data service response message to the MS(407), and checks whether packet data is inputted from the MS through the BTS(409). If so, the packet data is transmitted to a local area network through a private base station controller of the private network(411).
Patent KR-20020070133-A (KR)
Title: Method of manufacturing image-forming apparatus
Inventor: HORIGUCHI TAKAHIRO
IPC: H01L29/04
Filed: 2002-02-27
Abstract: PURPOSE: A manufacturing method of an image-forming apparatus is provided to simplify an electron-emitting device forming process and perform a low-cost image-forming apparatus exhibiting high display quality for a long term. CONSTITUTION: A method of manufacturing an image-forming apparatus comprises the steps of preparing a first substrate, forming a plurality of electrode pairs on the first substrate, each electrode pair comprising opposing electrode, arranging polymer films, each polymer film bridging between the opposing electrodes in each electrode pair, irradiating each of the polymer films with light or a particle beam to reduce a resistance of each polymer film and change at least part of each polymer film into a conductive film, flowing a current between the opposing electrodes in each electrode pair through the conductive film to form a gap in the conductive film, and joining, in a reduced-pressure atmosphere, the first substrate on which the electron-emitting devices are arranged and a second substrate on which an image-forming member is arranged, via a bonding member.
Patent KR-20020074386-A (KR)
Title: Optical sheet
Inventor: OKABE MOTOHIKO
IPC: F21V8/00
Filed: 2002-02-28
Abstract: PURPOSE: An optical sheet is provided to guide beams nearer to the upward direction, which is the direction to the front face of the screen of a liquid crystal display without decreasing the efficiency for the light source, and to reduce the number of members forming a back light unit. CONSTITUTION: An optical sheet(1) to guide beams made incident from the lower side to exit upward has a beam controlling part(4) formed by alternately arranging first square parts(3) and second square parts(5) alternately arranged in the transverse direction. The first square parts and the second square parts are formed to have a square or rectangular cross section, and the first square parts have a higher refractive index than the refractive index of the second square parts. By using the optical sheet, beam is guided nearer to the absolute upward direction when beams made incident to the optical sheet from the lower side are made to exit upward.