baber/WOPTO huggingface dataset:
Patent KR-20000027096-A (KR)
Title: Method for identifying type of optical disk
Inventor: AN HWA SIK
IPC: G11B20/00
Filed: 1998-10-24
Abstract: PURPOSE: A method for identifying a type of an optical disk is provided to accurately identify an optical disk type by verifying the optical disk type based on the identified result. CONSTITUTION: An optical pick-up(2) reads a write signal from an optical disk(1). An amplifier(6) amplifies a focus error signal read in the optical pick-up(2). A focus zero crossing signal generator(7) generates a focus zero crossing signal when the amplified focus error signal is over a uniform level. An A/D converter(18) converts the focus error signal outputted from the optical pick-up(2) into a digital data. A shutter(19) variably adjusts the amount of a beam inputted from the optical disk(1). A microcomputer(15) controls an operation of all component elements for judging whether an initial estimated optical disk type is normally judged and performing an operation to verify the judged result.
Patent KR-20000027204-A (KR)
Title: Method for serving arrival of the post call conversion of personal communication exchanger
Inventor: LEE DEOK HO
IPC: H04M3/54
Filed: 1998-10-27
Abstract: PURPOSE: A method for serving an arrival of the post call conversion of a personal communication exchanger is provided to convert an arrived call into other mobile terminal required a call connection when an arrived call connection requirement from other mobile terminal is transmitted. CONSTITUTION: A method for serving an arrival of the post call conversion of a personal communication exchanger is consisted of nine steps. A first step is to judge whether a service for converting a voice call box or a service for converting an arrived call and so on register on a first mobile terminal(10) and activate or do not. A second step is that the first mobile terminal receives a message for requiring a call access from a second mobile terminal(20) in a case that the first mobile terminal and a third mobile terminal(30) are in busy. A third step is to transmit a position requirement for a first mobile terminal to a home position register(70). A fourth step is to transmit a response message for the position requirement to a part for controlling a subscriber position through a second call processing part(61) of a personal communication exchanger(60). A fifth step is to transmit a standby sound when the first mobile terminal is in busy. A sixth step is to judge whether a digit key and a specific function key input signal from the first mobile terminal are transmitted or not. A seventh step is to use a busy standby service when the specific function key input signal is transmitted in the sixth step. An eighth-step is to transmit an arrival call conversion number requirement to the home position register when the digit key and the specific function key input signal are transmitted at the same time in the sixth step. A ninth step is to transmit a response message for the arrival call conversion number requirement to the second mobile terminal and perform an arrival conversion service.
Patent KR-20000028457-A (KR)
Title: Method for controlling reproduction of video compact disk system
Inventor: SON TAE YONG
IPC: G11B27/02
Filed: 1998-10-31
Abstract: PURPOSE: A method for controlling reproduction of video compact disk system is provided to enhance a using convenience by simultaneously reproducing programs recorded in a plurality of optical disk. CONSTITUTION: A system control unit stores TOC information to a certain region of a storing unit when a power is provided to a video compact disk system(S10,S20). The system control unit stores reproducing control information and screen component information provided from a VCD player to a certain region of the VCD player(S30). The VCD player drives a tray roulette according to a control of the system control unit and selects an optical disk(S40). The system control unit stores TOC information provided from the VCD player to a certain region of the storing unit(S50). The system control unit stores reproducing control information and screen component information corresponding to the optical disk to a certain region of the VCD player(S60). The VCD player selects the optical disk(S70). The system control unit stores TOC information provided from the VCD player to a certain region of the storing unit(S80). The system control unit stores reproducing control information and screen component information corresponding to the optical disk to a certain region of the VCD player(S90).
Patent KR-20000031403-A (KR)
Title: Multiplex monitoring type monitor system
Inventor: JANG U SEOK
IPC: H04N7/18
Filed: 1998-11-06
Abstract: PURPOSE: A multiplex monitoring type monitor system is to monitor through one monitor after time dividing and multiplex transmitting an image monitored from a plurality of monitoring cameras. CONSTITUTION: A plurality of monitoring cameras(101,102) are respectively provided at a desired monitoring place, and output an image signal photographed at a corresponding place. A multiplexor(120) selects and outputs the image signal applied from the monitoring cameras based on a selection control signal. A transmitting unit(130) modulates the image signal outputted from the multiplexor into a predetermined RF signal and wireless transmits it. A photograph unit includes a control unit(110) which outputs the selection control signal to the multiplexor. A receiving unit(210) receives the RF signal from the transmitting unit, demodulates the image signal, and outputs it. A monitoring unit includes a monitor(220) for displaying the image signal from the receiving unit.
Patent KR-19990014493-A (KR)
Title: 다공성 (질) 제조에 의한 붙힘침
Filed: 1998-11-17
Abstract: 본 발명은 세상에서 존재하는 물질(재료)에 특수한 공법(미세한 가루를 압축성형하는 방법)으로 다공질(용융되지않은 금속 및 재료는 폐기공과 개기공으로 조직이 분포되어 있다.)원리를 이용하여 개기공에 고농도의 무해한 액체를 강제로 진공함침하여 몸(신체)의 온도가 37。c 인 이하에서 모세관현상으로 외부로 나오는 원리를 이용하여 한방에서 사용하는 붙힘침을 한층 더 실용성있게 치료 및 건강 기구로 제조하는 것 입니다.(예:붙힘침은 침 자체의 성분 및 형태로 신체의 구조(혈,피부)을 자극하는 효과지만 붙힘침 재료를 다공질 공법으로 제조하여 개기공에 유해한 물질(예:쑥, 인삼 등의 고농도 액체) 강제 진공함침하여 침의 효과와 한방에서 유효한 물질을 침의 자극된 피부에 살포 및 침투하는 두가지 기능을 함께하는 것이 본 발명의 목적으로 하는 것이다.
Patent KR-20000033046-A (KR)
Title: Method for reusing magnesium ammonium phosphate(map) in treatment of wastewater containing nitrogen
Inventor: HAN SANG BAE
IPC: C02F1/52
Filed: 1998-11-19
Abstract: PURPOSE: A treatment method is provided, which is characterized in that magnesium ammonium phosphate(MAP) generated from waste water treatment containing nitrogen is recycled for treating waste water containing nitrogen in short time. CONSTITUTION: The method is composed of following processes. Recycling process of MAP(S10) is to collect crystal of MAP. Recycled crystal of MAP is heated in separation process of ammonia(S12), then, crystal of MAP is separated to ammonia gas and magnesium hydrogen phosphate(MHP). Dissolution process of MHP(S14) is to product solution containing magnesium ion and phosphate ion together by dissolving MHP in hydrochloric acid. Crystallization process of MAP(S16) is that solution containing magnesium ion and phosphate ion together is injected into waste water containing ammonium-nitrogen. So, MAP crystal is formed. Eventually, MAP can be reused in short time.
Patent KR-20000033796-A (KR)
Title: Reflector for car audiocassette
Inventor: LIM TAE HYONG
IPC: G11B33/02
Filed: 1998-11-25
Abstract: PURPOSE: A reflector for a car audio cassette is provided. CONSTITUTION: In a reflector(335) for a car audio cassette(300), a through hole is formed at a body(305), and a volume switch(320) having a knob(322) and an axis(330) protruded downwardly from the internal bottom surface of the knob(322) passes through the inside of the through hole, and thus is fixed to a substrate and supported in an axial direction. An inside diameter of the through hole of the reflector(335) is set to minimize a gap from an outside diameter of the axis(330) of the volume switch(320). The volume switch(320) also minimizes a gap between its axis(330) and the reflector(335), thereby preventing the axis(330) of the volume switch(320) from being tilted over a predetermined degree.
Patent KR-20000038462-A (KR)
Title: Optical scanning system for printer
Inventor: LEE BEOM RO
IPC: H04N1/50
Filed: 1998-12-07
Abstract: PURPOSE: An optical scanning system for a printer is provided to reduce error rate of page synchronous signals in order to reduce image information write error. CONSTITUTION: An optical scanning system for a printer includes a plurality of optical scanning units(120,130,140,150), a plurality of optical detectors(62,162), a pattern discrimination sensor(160), a page synchronous signal generator(180,190), and an optical scan controller(170). The plurality of optical scanning units(120,130,140,150) are implemented in parallel with one another with respect to a photosensitive belt(111). The optical detectors(62,162) are implemented so as to detect light from a position displaced from the photosensitive belt(111) with a predetermined spacing to an edge of the photosensitive belt. The optical detector generates a pulse signal corresponding to an incident light. The pattern discrimination sensor(160) detects passage of a pattern formed on the photosensitive belt and generates a reference position detecting signal with respect to one round of the photosensitive belt. The page synchronous signal generator(180,190) counts the pulse signals from one of the optical detectors. The optical scan controller(170) controls the scan of each image information using the page synchronous signal.
Patent KR-20000038522-A (KR)
Title: Laser cutting equipment and method for correcting cutting path thereof
Inventor: KIM BYUNG IL
IPC: B23K26/062
Filed: 1998-12-04
Abstract: PURPOSE: A laser cutting equipment is provided to minimize a cutting defect by distinguishing if a laser beam for cutting is advanced in a straight line via a scribe line by installing an optical modulator in the laser cutting equipment to irradiate a laser beam for directing on the same line of the laser beam for cutting. CONSTITUTION: A crack is generated in a glass base plate by rapidly heating with a laser beam for cutting and rapidly cooling. A laser beam for aligning is irradiated into the crack, an optical amount of laser beam for aligning reflected in a protruded face of crack is detected by a detecting portion and an electrical signal is transferred to a CPU. The CPU compares the electric signal with a previously inputted strength of light by exchanging the signal to a strength of light and decides if the laser beam for cutting is seceded from a scribe line. If the previously inputted strength of light is different from the strength of dispersed light, an angle swerved the laser beam for cutting is measured and a position of transferring device is controlled as the measured angle. After transferring the transferring device, the CPU exchanges the amount of light continuously transferred from the detecting portion into the strength of light and decides if the laser beam for cutting is aligned with the scribe line by comparing the exchanged strength of light and the previously inputted strength of light. If the scribe line and the laser beam for cutting is conformed, the glass base plate is cut.
Patent KR-20000038914-A (KR)
Title: Setting method of object collisions in game manufacturing tool
Inventor: KIM HO KWANG
IPC: G06T17/00
Filed: 1998-12-10
Abstract: PURPOSE: A setting method for object collisions in a game manufacturing tool is provided to enable a game developer to save time and expenses necessary for making a computer game by designating objects to be collide in advance. CONSTITUTION: A setting method for object collisions in a game manufacturing tool is provided to divide hostile objects into the same category and process collisions when objects belonging to the same category meet each other at the same location. The method comprises classifying all objects in a computer game into groups according to the hostility, installing sub routine programs to check if there are two more objects in a same location and check if these objects belong to the same category, and setting up a sub routine program causing a collision if these objects are in the same category or controlling a pass if these objects don't belong to the same category.
Patent KR-19990063064-A (KR)
Title: 텅스텐용 기계 화학적 폴리싱 슬러리
IPC: H01L21/321
Filed: 1998-12-15
Abstract: 본 발명은 슬러리중에서 현탁성 및 연마 물질의 안정성이 본질적으로 안정한 반도체 기판상의 텅스텐 금속을 기계 화학적으로 폴리싱시키는데 유용한 질산철(III)-알루미나를 함유한 슬러리에 관한 것이다.  슬러리의 조성은 폴리싱후에 외부 물질의 잔류가 적도록 조정되고, 질산철(III) 농도의 감소로 인해 종래 기술의 슬러리보다 덜 부식성이다.  슬러리 조성물은 9중량%의 알루미나 현탁액 375㎖, 철(III) 9수화물 약 200g, 약 4.5ℓ로 희석시키기 위한 물, 및 슬러리의 pH를 약 1.0 내지 1.5로 조정시키기에 충분한 70중량% 질산을 포함한다.
Patent KR-19990030383-A (KR)
Title: 녹차 추출물을 함유하는 일회용 패드제 조성물
Filed: 1998-12-17
Abstract: 본 발명은 일회용 패드(pad) 제품을 장시간 착용시 체액분비물 및 뇨로부터 발생될 수 있는 불쾌취를 제거하기 위한, 녹차 추출물, 바람직하게는 카테킨류 유도체 성분인 (-)-에피갈로카테킨 갈레이트 ((-)-Epigallocatechin gallate)를 10% 이상 함유하는 녹차 추출물, 및 구연산과 비타민 C로부터 이루어진 화합물 중 1종 이상을 필수 성분으로 포함하고, 액상 제품의 제조시 필요하다면 글리세린과 에탄올로 이루어진 화합물 중 1종 이상을 더 포함하는 일회용 패드제 조성물에 관한 것이다.
Patent KR-20000041129-A (KR)
Title: Semiconductor device and manufacturing method thereof
Inventor: HONG SEONG GWON
IPC: H01L21/28
Filed: 1998-12-21
Abstract: PURPOSE: A semiconductor device is to decrease the stress and the hydrogen transmission effect on the device, thereby improving the property of the device and decreasing the junction leakage current upon the borderless contact process. CONSTITUTION: A device comprises: a semiconductor substrate(21) defined as a first active area and a second active area by a device isolation film(22); a first gate isolation film(23a) formed on the semiconductor substrate of the first active area; a second gate isolation film(23b) formed thicker than the first gate isolation film on the semiconductor substrate of the second active area; a first and second gate electrode(24a,24b) formed on the first and second gate isolation films respectively; a source/drain impurity area(26) formed in the surface of the semiconductor substrate at both sides of the first and second gate electrodes; a metal silicide film(27) formed on the surface of the semiconductor substrate on which the first and second gate electrodes and the source/drain impurity area are formed; a nitride film(28) formed on the semiconductor substrate of the first active area; and an oxide film and a planarized layer formed on the semiconductor substrate of the first active area and the second active area.
Patent KR-19990063473-A (KR)
Title: 고체 촬상 장치
IPC: H04N5/357
Filed: 1998-12-24
Abstract: 픽셀부의 레이아웃을 최적화하기 위해서, 광전 변환부, 광전 변환부내에서 생성된 전하를 전송하기 위한 전하 전송부, 및 전하 전송부로부터 전송된 신호 전하에 대응하는 신호를 증폭하고 이 신호를 출력하기 위한 증폭부를 포함하되, 복수의 광전 변환부, 복수의 전하 전송부, 및 복수의 증폭부가 행 및/또는 열 방향으로 배치되며, 서로 인접한 전하 전송부 및 증폭부가 접속된다.
Patent KR-20000044318-A (KR)
Title: Method for building up paging area in mobile communication network
Inventor: LEE HYEONG POK
IPC: H04B7/26
Filed: 1998-12-30
Abstract: PURPOSE: A method for building up paging area is provided for more efficient second time paging in mobile communication network, when the first time paging is failed. CONSTITUTION: A method for building up paging area in mobile communication network, when the first time paging is failed, is provided to build up the second time paging area, by excluding the first time paging cell area and building up the second time paging area with the rest of cell areas.
Patent KR-20000045744-A (KR)
Title: Mass air flow meter for measuring countercurrent adopted in suction system of automotive vehicle
Inventor: SIM WOO CHAN
IPC: F02M35/10
Filed: 1998-12-30
Abstract: PURPOSE: A mass air flow meter for measuring a countercurrent adopted in a suction system of automotive vehicle is provided to achieve an improved engine performance and reduce exhaust gas while permitting the amount of fuel injection to be controlled by precisely measuring the amount of air flowing into the combustion chamber of the engine. CONSTITUTION: A mass air flow(MAF) meter(10) arranged intermediate an air duct(4) connecting an air cleaner and a throttle body, the MAF meter(10) comprising a Pitot pipe(20) arranged in the rear of a heating resistor(12) in such a manner that the entrance of the pipe(20) is directed toward the throttle body, and a total pressure sensor(21) and a static pressure sensor(22) arranged at an end of the Pitot pipe(20), the sensors(21, 22) being circuit-connected to an ECM(14) so as to sense the total pressure state and static pressure state of the air flowing into the Pitot pipe(20) and apply a signal representing such state to the ECM(14).
Patent KR-19990028967-A (KR)
IPC: C12P21/04
Filed: 1996-07-17
Abstract: PCT No. PCT/EP96/03129 Sec. 371 Date Dec. 31, 1997 Sec. 102(e) Date Dec. 31, 1997 PCT Filed Jul. 17, 1996 PCT Pub. No. WO97/04005 PCT Pub. Date Feb. 6, 1997The invention concerns new cyclic peptides of general formula (I) in which the letters A to K signify residues of the following amino acids: A is substituted homothreonine of the general formula (II): R1-CH2CH(CH3)-CH(OH)-CH(NHCH3)-COOH in which R1 is n-propyl or propenyl in which the double bond is preferably in the trans configuration; B is  alpha -aminobutyric acid, valine, norvaline or threonine; C is a D-amino acid of the general formula (III): CH3NH-CH(R)-COOH in which R is straight-chain or branched-chain C2-C6 alkyl, alkenyl or alkynyl, whereby these groups may be substituted by hydroxy, amino, C1-C4 alkylamino, C1-C4 dialkylamino, alkoxy or acyloxy, COOR2 or CONHR2 in which R2 is straight-chain or branched-chain C1-C4 alkyl X-R3 in which X is O or S and R3 is straight-chain or branched-chain C1-C4 alkyl, alkenyl or alkynyl and, when X is S, R3 may also by aryl or heteroaryl, halogen, preferably fluorine, cyano, CHR4R5 in which R4 is hydrogen, methyl, ethyl or phenyl and R5 is hydrogen, hydroxy, halogen (preferably fluorine), amino, C1-C4 alkylamino, C1-C4 dialkylamino, acyloxy (preferably acetyloxy), tert-butoxycarbonylamino-ethoxy-ethoxy-acetyloxy or alkoxycarbonyl (preferably butoxycarbonyl); D is N-methyl-gamma-hydroxyleucine or N-methyl-gamma-acetyloxyleucine; E is valine; F, I and J are each N-methylleucine; G is alanine; H is D-alanine or D-serine; and K is N-methylvaline. The invention also concerns the preparation of such peptides and their use in the prevention of infection by the human immunodeficiency virus (HIV).
Patent KR-19990044139-A (KR)
Title: 가역 광학 정보 매체
IPC: B41M5/26
Filed: 1997-06-11
Abstract: 본원에서는 기판(1), 제 1 유전층(2), Ge-Sb-Te(3)에 기초한 위상 변환 기록층, 제 2 유전층(4)과 금속 미러층(5)을 포함하는 가역 광학 정보 매체를 개시한다. 기록층(3)은 원자 퍼센트 단위로 Ge 40x Sb 40-40x Te 60-10x , 여기에서 0.166 ≤ x ≤ 0.444의 조건을 만족하는 조성의 합금을 포함하며, 상기 기록층(3)의 층 두께(d 3 )는 25 nm 내지 35 nm의 범위에 들어간다. 상기와 같은 매체는 고속 기록(즉, CD 속도의 두 배 이상)에 적합하며, 10 5 이상의 직접 겹쳐 쓰기가 가능할 정도로 순환성이 뛰어나다.
Patent KR-19990067175-A (KR)
Title: 1,3-프로판디올의 제조방법
IPC: B32B3/12
Filed: 1996-10-28
Abstract: 1,3-프로판디올의 제조 방법은 (a) 적어도 한가지 활성 코발트 카보닐 하이드로포밀화 촉매류를 포함하는 코발트 카보닐 반응 생성 혼합물을 생성하기에 적당한 조건하에 필수적으로 비-수 혼화성 액체 매질중의 합성 가스와 코발트 하이드록사이드, 코발트 (II, III) 옥사이드 및 코발트 카보네이트 중 적어도 한가지로부터 선택된 코발트 염과의 반응; (b) 15 중량% 이하의 3-하이드록시프로판알을 포함하는 중간 생성 혼합물을 생성하기에 유효한 조건하에 촉매량의 코발트 카보닐 반응 생성 혼합물 및 유효량의 촉매 촉진제의 존재하에 필수적으로 비-수 혼화성 용매 중의 합성 가스와 에틸렌과의 접촉; (c) 수성 액체를 중간 생성 혼합물로 첨가하고 대부분의 3-하이드록시프로판알로 추출하여 중간 생성 혼합물 중의 3-하이드록시프로판알의 농도보다 큰 3-하이드록시프로판알을 포함하는 수성상, 및 적어도 한가지 코발트 카보닐의 대부분을 포함하는 유기상의 제공; (d) 유기상으로부터 수성상의 분리; (e) 적어도 유기상의 대부분을 단계(b) 공정으로의 환원; (f) 1,3-프로판디올을 포함하는 수소화 생성 혼합물을 제공하기 위한 수소화 조건하 수소화 촉매의 존재하에 3-하이드록시프로판알을 포함하는 수성상과 수소와의 접촉; 및 (g) 수소화 생성 혼합물로부터 1,3-프로판디올의 회수의 단계를 포함한다.
Patent KR-19990082415-A (KR)
Title: 다공질막, 그의 제조 방법, 및 그를 사용하여 제조한 적층 필름및 기록용 시트
IPC: B41M5/00
Filed: 1997-12-08
Abstract: 고분자와, 이 고분자에 대한 양용매와, 이 양용매보다 비점이 높고 상기 고분자에 대한 빈용매를 포함하는 도프의 도막을 건조시키는 건식 상전환법에 의해, 미세 상분리 구조를 가지고, 또한 파장 400 nm의 광선 투과율이 30% 이상인 다공질막을 얻는다. 
     상기 고분자에는, 셀룰로오스 유도체. 아크릴로니트릴계 중합체, (메타)아크릴산에스테르계 중합체 등의 비닐계 중합체 및 폴리술폰계 중합체 등이 포함된다.  이 고분자 다공질막의 공공율은 10 내지 60%, 평균 공경 0.002 내지 0.35㎛ 정도, 최대 공경 0.4㎛ 이하이다.  다공질막은 투명성이 우수하고 생산성이 높다.
Patent KR-20000004964-A (KR)
Title: Method for treating pan
Inventor: HELTON DAVID R
IPC: A61K31/55
Filed: 1997-03-24
Abstract: PURPOSE: A method for treating pain is provided, which comprises administering an onalgesic dosage of olanzapine to an animal in need of such treatment. CONSTITUTION: Olanzapine will be the Form II olanzapine polymorph having a typical X-ray powder diffraction, and is administered as the substantially pure Form II olanzapine polymorph containing less than about 0.05% content of acetonitrile and less than 0.5% of associated water. Olanzapine is administered about 0.1-30mg per day in case of the acute pain like headache, arthritis, and simple muscle strain, about 5-30mg per day in case of the neuropathic pain like chronic pain, pain associated with arthritis, and cancer associated pain, and about 5-25mg per day in case of the nociceptive like post-operation pain, cluster headaches, and dental pain.
Patent KR-20000065074-A (KR)
IPC: C07D311/14
Filed: 1997-05-01
Abstract: The invention concerns novel 6- or 7-substituted derivatives of esculetin (6,7-dihydroxy-2H-1-benzopyran-2-one), their synthesis, and their application as substrates for the detection of micro-organisms in samples where a derivative is enzymatically cleaved to release a colored or fluorogenic marker which has a low tendency to diffuse through agar or other aqueous environments.
Patent KR-20000050643-A (KR)
Inventor: KAKIMOT MASAKAJU
IPC: B26F1/00
Filed: 1999-01-13
Abstract: PURPOSE: A punch stamp is provided to remove tips adhered on a front end of a punch with respect to a work piece such as a green sheet or a flexible substrate in which punching pitches are considerably shortened as well. CONSTITUTION: In a punch stamp, a die plate(21) is provided by perforating proximity die holes(21a) on a sheet of plate. The surface of a support body(22) supporting the die plate(21) is provided with a connecting groove(22d) for connecting a connection hole(22c) communicated with the exterior and a discharging hole(22b) to form air passage(23). Upon punching holes, compressed air is blowing out from the exterior through the air passage(23) to a front end of the punch extruded toward the discharging hole(22b), so that the tips adhered on the front end of the punch are removed.
Patent KR-20000050945-A (KR)
Inventor: HWANG MI YOUNG
IPC: B65D5/00
Filed: 1999-01-15
Abstract: PURPOSE: A food vessel is provided to prevent of occurring of industrial waste matter by making a vessel by using paper. CONSTITUTION: A food vessel is made of paper and has following structure. Left/right side walls(102) and front/rear side walls(103) are extend from and bent to a bottom plate(101). An attaching portion(104) extended from and bent to the sides of left/right side walls(102) joints the left/right side walls(102) and the front/rear side walls(103). A reinforcing portion(102") extended from and bent to a periphery portion(102') extended from the left/right side walls(102) reinforces the strength of the left/right side walls(102). The front end of the reinforcing portion(102") is jointed to the outer surface of the left/right side walls(102). A reinforcing portion(103") extended from and bent to a periphery portion(103') extended from the front/rear side walls(103) reinforces the strength of the front/rear side walls(103). The front end of the reinforcing portion(103") is jointed to the outer surface of the front/rear side walls(103). Protruded reinforcing portions(105,106) reinforce the strength of edges by jointing each other when the both ends of the periphery portions(102',103') are attached.