baber/WOPTO huggingface dataset:
Patent KR-20030047427-A (KR)
Title: Structure for measuring air gap of motor in reciprocating compressor
Inventor: HYUN SEONG YEOL
IPC: F04B17/04
Filed: 2001-12-10
Abstract: PURPOSE: A structure for measuring an air gap of a motor of a reciprocating compressor is provided to prevent the compressor from being assembled in an unstable state of the air gap caused by the manufacture and assembly errors of components by keeping the air gap of the reciprocating motor constant and accordingly to prevent the breakage of the compressor caused by the malfunction of components. CONSTITUTION: In a reciprocating compressor comprising front and rear frames(200,500) combined to a reciprocating motor(300) and both sides of the reciprocating motor respectively, a piston(400) receiving the rectilinear reciprocation driving force of the reciprocating motor and rectilinearly reciprocating in a compression space(P) formed at the front frame, a resonance spring unit(600) elastically supporting the movement of the piston, and a valve unit(700) installed to the front frame to cover, open, and shut the compression space, a structure for measuring an air gap(G) of the motor of the reciprocating compressor comprises a plurality of measuring holes(250) penetrate-formed at the front frame to insert a gap gauge measuring the air gap of the reciprocating motor through the front frame into the air gap of the reciprocating motor after assembling components for the compressor and an opening and shutting device installed to the front frame to open and shut the measuring holes.
Patent KR-20030049076-A (KR)
Title: The jig for fixing pcb
Inventor: KIM JONG DAE
IPC: H05K13/04
Filed: 2001-12-14
Abstract: PURPOSE: A jig for fixing a printed circuit board is provided to improve the efficiency of a component mounting work by arranging the printed circuit board to a jig body with a predetermined rate of a position. CONSTITUTION: A square jig body(11) is capable of arranging at least two printed circuit boards with a predetermined size. A plurality of guide holes(12) are arranged on a predetermined position so as to fix the square jig body(11) on a chip mounter equipment. A plurality of guide pins(13) fixes the printed circuit boards. A printed circuit board fixing hole(14) is provided so as to arrange the printed circuit boards with a predetermined rate of a position. The guide pins(13) fixes the printed circuit boards on the jig body(11). The guide holes(12) fix the jig body(11) in order to mount chip components or heterogeneous components.
Patent KR-20020053718-A (KR)
Title: Remover composition
Inventor: ICHIKI NAOKI
IPC: H01L21/311
Filed: 2001-12-19
Abstract: PURPOSE: A remover composition manifesting an extremely low corrosion property against materials such as an insulation film, metal film and the like constituting a semiconductor, and having a high ability of removing a photoresist and a residue generated in treating a semiconductor is provided. CONSTITUTION: The remover composition comprising (a) 100 parts by weight of a composition obtained by adding a cyclic urea compound to water, water-soluble organic solvent, or a mixture of water and water-soluble organic solvent so that the concentration of the cyclic urea compound is from 1 to 90% by weight, wherein the cyclic urea compound is represented by the following general formula (I), wherein, R1 and R2 each independently represent alkyl group which may be substituted, hydrogen atom, hydroxyl group, or carboxyl group, Z represents oxygen atom or sulfur atom, (b) 0.1 to 150 parts by weight of an organic amine, and (c) 0.001 to 100 parts by weight of a salt of an amine with an acid.
Patent KR-20020051854-A (KR)
Inventor: KIM IN GEOL
IPC: A61K6/00
Filed: 2001-12-20
Abstract: PURPOSE: A composition for devitalization of a tooth containing one or two or more etching agents containing aldehyde as a main component and an additive is provided which increases the devitalization effect of a tooth and reduces side-effects by reducing the amount of etching agents. CONSTITUTION: This composition contains 17 to 40% by weight of an etching agent and 2 to 40% by weight of a local anesthetic as a main component and 20 to 63% by weight of one or more additives selected from 6 to 40% by weight of an astringent agent, 2 to 30% by weight of silicon oil and volatile vegetable oil or unsaturated vegetable oil and 10 to 35% by weight of others, based on the total weight of the composition.
Patent KR-20030052580-A (KR)
Title: Image sensor with improved blue attenuation
Inventor: LIM MU SEOP
IPC: H01L27/146
Filed: 2001-12-21
Abstract: PURPOSE: A pinned photodiode in an image sensor is provided to be capable of improving attenuation of blue color by forming partially a p0 region used as a pinning layer on an n- region. CONSTITUTION: A pinned photodiode of an image sensor comprises a p-type semiconductor layer(1), an n- region(3) and a p0 region(4). The n- region(3) is formed in the p-type semiconductor layer(1). The p0 region(4) is formed on the n- region(3). At this time, the p0 region(4) is partially formed on the n- region(3) instead of the entire surface of the n- region, thereby reducing potential barrier and using as a pinning layer.
Patent KR-20030054794-A (KR)
Title: a manufacturing technique of spring-hinge housing for glesses
Inventor: KIM YOUNG HO
IPC: G02C5/16
Filed: 2001-12-26
Abstract: PURPOSE: A method for manufacturing a hinge housing provided with a spring for use in a glasses is provided to improve the productivity by forming a circle-cross-section liner base metal into the hinge housing through a press finishing. CONSTITUTION: A base metal(2) has flat-ends and curved upper and lower surfaces through a rolling process. The rolled base metal(2) is press-finished by a metal mold having a hinge housing shape. Thereafter, a hinge housing(3) is formed on the rolled base metal(2). An excess mold metal(3a) is protruded from the hinge housing(3) to outside. The excess mold metal(3a) is chamfered to trim a surface of the hinge housing(3). Thereafter, an outer surface of the hinge housing(3) is trimmed to complete the forming process of the hinge housing(3).
Patent KR-20030054986-A (KR)
Title: A METHOD FOR PREVENTING THE DEGRADATION OF BTX(Benzene.Toluene.Xylene) ABSORPTION OIL IN COKE GAS REFINING PROCESS
Inventor: CHOI JONG YEOP
IPC: C10K1/08
Filed: 2001-12-26
Abstract: PURPOSE: A method for preventing the deterioration of a BTX(benzene, toluene, xylene) absorption oil in cokes gas purification is provided to prevent the deterioration of an absorption oil by absorbing and removing the material deteriorating the absorption oil in advance. CONSTITUTION: In a process of purifying cokes gas by absorbing impurities such as naphthalene and tar, absorbing impurities such as BTX, removing BTX in a distillation tower and supplying a BTX absorption oil to a BTX absorption tower(7), a valve member(19) is blocked so that the absorption oil used in absorbing impurities does not flow into the BTX absorption tower, the absorption oil containing a large amount of impurities is all supplied to a depitching tower(10), and only the absorption oil collected in the BTX absorption tower is supplied into a naphthalene absorption tower(2) through an orifice(13).
Patent KR-20030058010-A (KR)
Title: System and method for managing account using mixing words matched with account number, and storage media for having program source thereof
Inventor: KIM JONG WAN
Filed: 2001-12-29
Abstract: PURPOSE: A system and method for managing an account is provided to enable a user to inquire a corresponding account number and to process various kinds of financial businesses using a combined word by storing the combined word which is memorized by the user for being matched with the account number of the user. CONSTITUTION: A system manages a withdrawal and a deposit of a bankbook account of a user received from each bank branch. A user inputs a combined word matched with an account number for the registration in each bank branch terminal(10) and waits an approval. If the bank branch terminal(10) transmits user information, an account number, and a combined word, a host computer(30) determines an approval of the combined word and transmits approval information to the bank branch terminal(10). The combined word is constituted by a combination of the Korean alphabet, the English alphabet, or numeral. The host computer(30) includes a DB(35) which stores user information including an account number with at least one combined word.
Patent KR-20030059365-A (KR)
Title: Method and system of receiving E-mails in internet fax via only once point-to-point protocol connection
Inventor: BAE SEONG HUN
IPC: H04N1/00
Filed: 2001-12-29
Abstract: PURPOSE: A method and system for receiving E-mails in an Internet facsimile through one-time PPP connection are provided to allow an Internet facsimile user to receive a plurality of E-mails through one-time PPP connection. CONSTITUTION: A user sets at least two mail accounts to an Internet facsimile(100). The Internet facsimile connects the Internet(150) through an Internet service provider(140) according to E-mail receiving command. The Internet facsimile sequentially receives E-mails from mail servers(160,161,162) corresponding to the mail accounts through the Internet service provider. The data formats of the received E-mails are converted into print data to be printed by the Internet facsimile. The print data is printed.
Patent KR-20030058607-A (KR)
Title: Method for manufacturing a transistor
Inventor: KWON HO YEOP
IPC: H01L21/336
Filed: 2001-12-31
Abstract: PURPOSE: A method for fabricating a transistor is provided to increase the thickness of a gate oxide layer at the edge of a gate electrode by implanting oxygen ions and growing an oxide layer on the side surface of a polycrystalline silicon layer through a heat treatment process in an oxygen-free atmosphere. CONSTITUTION: The gate electrode of a stack structure composed of a polycrystalline silicon layer(35) and a metal layer is formed on a semiconductor substrate(31) by interposing a gate insulation layer. Oxygen ions(41) are implanted into the side surface of the polycrystalline silicon layer and the gate insulation layer at the edge of the gate electrode. The implanted oxygen ions are reacted with silicon so that the oxide layer is grown on the side surface of the polycrystalline silicon layer and on the gate insulation layer at the edge of the gate electrode.
Patent KR-20010072816-A (KR)
IPC: A61L29/08
Filed: 1999-08-20
Abstract: 본 발명은 하나 이상의 피복층(16)(여기서, 피복층은 이로부터의 생활성 물질의 방출을 조절한다)이 구조물의 하나의 표면에 위치하고, 생활성 물질의 하나 이상의 층(18)이 피복층(16)의 적어도 일부분 위에 위치하는, 관상계, 식도, 기관, 결장, 담 즙관 또는 뇨관내로 삽입시키기에 적합한 구조물(12)을 포함하는 피복된 삽입용 의료 장치(10)에 관한 것이다.  또한, 하나 이상의 다공성 층(20)은 생활성 물질 층(18) 위에 위치할 수 있고, 여기서, 다공성 층은 중합체를 포함하고, 이를 통한 생활성 물질의 방출을 조절한다.  다공성 층(20)은 바람직하게는 증착 또는 플라즈마 부착에 의해 적용된 중합체를 포함하며 생활성 물질의 방출을 조절한다.  중합체는 용매, 열 또는 촉매없이 단지 단량체 증기의 축합에 의해서만 부착되는 폴리아미드, 파릴렌 또는 이의 유도체인 것이 특히 바람직하다.
Patent KR-20010073076-A (KR)
Title: Ｚ-버퍼를 렌더링하기 위한 방법 및 장치
IPC: G06T15/40
Filed: 2000-06-27
Abstract: 복수의 도형 이미지 프리미티브 및 배경이 포함되는 이차원 픽셀 이미지를 제공하기 위한 이미지 처리 시스템 내에서, 도형 이미지 프리미티브는 3차원 물체를 나타내고, Z 버퍼 및 색 버퍼는 색 버퍼(354) 및 Z 버퍼(353)내의 전경에 관련된 이미지 프리미티브를 렌더링 하는 단계에 의해 클리어링되고, 그 후에 Z 버퍼를 스캐닝하고 각각의 픽셀에 대하여, 만일 Z 값이 0(357)과 같은 선정된 배경 값이라면, 배경 색(358)에 대응하는 색 버퍼 내의 위치를 클리어링하고, 만일 Z 값이 선정된 배경 값이 아니라면, Z 버퍼의 값을 선정된 배경 값(359)으로 클리어링한다. 이 방법에서, Z 버퍼 또는 색 값은 버퍼 클리어닝 처리동안 기록되지만, 결코 둘 다 되지 않는다. 픽셀은 그룹내의 캐시로부터 판독될 것이고, 그룹의 크기는 전경 또는 배경 픽셀이 되는 그룹내의 모든 연속적인 픽셀의 가능성을 최대화하도록 선택될 것이다. 다른 대역폭 절약은 타일 버퍼 및 두 개의 출력 버퍼를 이용함으로서 얻어진다.
Patent KR-20010080130-A (KR)
Title: Hybrid interleaver for turbo codes
IPC: H03M13/27
Filed: 1999-10-12
Abstract: A turbo code encoder with a hybrid interleaver having two recursive systematic constituent code (RSC) encoders. The system encodes a finite sequence of informative bits without requiring a plurality of tail bits to flush the registers of each encoder to an all-zero state. The hybrid interleaver reduces the turbo code overhead by using only a single tail bit sequence. By using only a single m-bit tail, the hybrid interleaver improves bit error rate (BER).
Patent KR-20010085958-A (KR)
IPC: A61K31/70
Filed: 1999-10-16
Abstract: 본 발명은 이소쿼세틴(쿼세틴-3-글루코시드) 또는 쿼세틴-4'-글루코시드 및 루틴의 혼합물을, 임의적으로는 쿼세틴과 함께 포함하는 경구투여 가능한 바이오플라보놀 조성물에 관한 것이다. 
     상기 조성물은 이의 산화방지 특성으로 인해 인체 조직 손상에 대한 보호 특성을 갖는 식품 보조제로서 유용하다. 더욱이, 상기 조성물은 연장된 시간동안 인체 혈장 속에서 동일한 아글리콘을 갖는 바이오플라보놀을 지속적으로 유지시킨다.
Patent KR-20010082340-A (KR)
IPC: H04H20/42
Filed: 2000-08-18
Abstract: 테이블 생성부(11)는 프로그램 정보 S11 및 EPG 데이터의 상한 비트레이트 S15를 수취하고, 이들의 정보에 기초하여 EIT[현재/다음]의 테이블 S13을 생성함과 함께, 상한 비트레이트 S15와 테이블 S13의 송출 빈도의 하한치를 고려한 후 테이블 S13의 송출 빈도 S12를 결정한다.  스트림 송출부(12)는 테이블 생성부가 생성한 테이블 S13 및 송출 빈도 S12를 수취하고, 테이블을 스트림 정보로 변환한 후, 송출 빈도 S12에 기초를 둔 빈도로 스트림 S14를 송출한다.  이 때문에, 상한 비트레이트의 제한과 송출 빈도의 제한의 양방을 충족시킨 후의 송출을 행하는 것이 가능해진다.
Patent KR-20010101882-A (KR)
IPC: H04N7/30
Filed: 2000-11-10
Abstract: 주파수 도메인에서의 블로킹 아티팩트들을 제거하기 위한 방법 및 장치에 관한 것이다. 2개의 주파수 도메인 블록들(A 및 B)가 비디오 스트림에 수신된다. 제 3 주파수 도메인 블록은 제 1 및 제 2 주파수 도메인 블록들 사이의 경계를 오버랩하는 변환 도메인에서 직접 계산된다. 제 3 블록의 계수들은 블로킹 아티팩트들을 ㅈ거하기 위해 주파수 도메인에서 수정되고, 그 후 이 수정은 주파수 도메인에서 2개의 주파수 도메인 블록들(A 및 B)의 수정으로 변형된다.
Patent KR-20020002501-A (KR)
IPC: C07C311/19
Filed: 2000-05-10
Abstract: 본 발명은 당뇨병의 예방 또는 치료약 용도의 하기 화학식 I의 화합물에 관한 것이다: 
     [화학식 I] 
     
       
     
     [식 중, A는 임의 치환된 아릴 또는 임의 치환된 헤테로아릴이고; 
     B는 저급 알킬, 임의 치환된 아릴 등이며; 
     X 1 은 -O-, -S- 또는 -NR a - {식 중, R a 는 수소 또는 저급 알킬이다}이고; 
     X 2 는 -NR b CO-, -CONR b -, -NR b CONR b -, -SO 2 -, -NR b SO 2 -, -D-, -D-O-, -D-CO-, -D-SO 2 -, -D-NR b CO- 또는 -D-NR b SO 2 - {식 중, D는 2가 헤테로시클릭 기이고; R b 는 수소 또는 임의 치환된 저급 알킬이다}이며; 
     m은 0 내지 3의 정수이고; 
     n은 2 내지 5의 정수이다].
Patent KR-20020030280-A (KR)
Title: Ｎｋ-1 수용체 길항제인 결정질(2-벤즈하이드릴-1-아자비사이클로[2,2,2]옥트-3-일)-(5-이소프로필-2-메톡시벤질)-암모늄클로라이드의 다형체
IPC: A61K31/13
Filed: 2000-06-06
Abstract: 본 발명은 I형 및 II형인 (2-벤즈하이드릴-1-아조-비사이클로[2,2,2]옥틸-3-일)-(5-이소프로필-2-메톡시벤질)아민 디하이드로클로라이드 이수화물의 2가지의 결정질 다형체 형태에 관한 것이다.  하나 이상의 이들 다형체를 함유하는 약학 조성물은 화학 치료를 받는 환자에서 구토를 치료하기 위한 제제에 우수한 안정성을 제공한다.  이 약학 조성물의 투여는 바람직하게는 정제 또는 캡슐에 의한  통상적인 경구 또는 정맥내이다.  또한, I형 및 II형을 제조하는 방법에 관한 것이다.
Patent KR-20020028929-A (KR)
Title: A condensate drain in compressed air system
Inventor: JOE WOON JE
IPC: F16T1/20
Filed: 2002-01-09
Abstract: PURPOSE: A condensate drain for a compressed air apparatus is provided to enhance maximally system efficiency by controlling an opening timing of outlet side valve by a delay of a control section and removing efficiently a condensate generated into a pipe without reducing a leakage loss of air. CONSTITUTION: A condensate drain is installed at a supplying pipe line of an air system, and collects and drains the condensate generated at the pipe line. The condensate drain comprises a storing portion(10), an assembly panel(20), a control section(30), a ball float portion(40), a drain portion(50) and a test portion(60). The storing portion(10) stores the condensate including air through an inlet(11) provided at one side. The assembly panel(20) is connected and installed at one side of the storing portion(10), and the control section(30) is installed at the assembly panel(20) and controls a pressure. The ball float portion(40) senses a level of the condensate. The drain portion(50) drains the condensate according to a control operation of the control section(30). The test portion(60) is installed at an upper portion of the drain portion(50) and controls manually the drain portion(50).
Patent KR-20020070627-A (KR)
Inventor: KITAGAWA HIROYASU
IPC: H05B6/68
Filed: 2002-01-22
Abstract: PURPOSE: To provide a microwave oven in which the timing for ending heating can be determined appropriately even when foods are placed at a plurality of places in the heating chamber. CONSTITUTION: When a decision is made, at S1011, that a temperature of 75°C is reached at any position on the bottom face of a heating chamber, the process advances to S1012. At S1012, a decision is made whether a temperature of 70°C or above is detected or not at some position other than that detected at S1011, and the process advances to S1013 if it is detected, otherwise the process advances to S1014. When a decision is made, at S1013, that the temperature detected at the detecting position of S1012 has reached 75°C, the process advances to S1014 where heating operation through a magnetron 12 is ended.
Patent KR-20030064514-A (KR)
Title: Method for storing telephone numbers in a mobile communication terminal equipment
Inventor: YOO SANG GYU
IPC: H04B1/40
Filed: 2002-01-28
Abstract: PURPOSE: A method for storing phone numbers in a mobile communication terminal is provided to automatically search whether a duplicate phone number or a name exists when inputting phone numbers or names in a phonebook, and to notify the duplicate phone number or name to a user, so as to conveniently use the phonebook and efficiently manage a memory. CONSTITUTION: A controller of a mobile communication terminal receives a phone number inputted by a user(210), and checks whether to store the input phone number in a previous phonebook database(212). If the user presses a storage key, the controller automatically compares the input phone number with pre-stored phone numbers(214), to check whether an identical phone number exists(216). If so, the controller moves to the previous phonebook database(218). The controller inquires the user of whether to modify the previous phonebook database(220). If the user selects a modification mode, the controller enables the user to modify information on the corresponding phone number(222). The controller receives information on the corresponding phone number inputted by the user and stores the input data in the phonebook database(224). If an identical phone number does not exist in the step 216, the controller produces a new phonebook database(226). The controller receives information on the corresponding phone number inputted by the user(228) and returns to the step 224 to store the input data in the phonebook database.
Patent KR-20030067052-A (KR)
Title: Powder container
Inventor: KIM CHANG HYUN
IPC: B65D83/06
Filed: 2002-02-06
Abstract: PURPOSE: A baby powder container is provided to minimize volume occupied upon carrying it by designing it into a flat elliptical shape and make it into one touch type of such a size and structure that is held and used by one hand. CONSTITUTION: The container(10) includes: a housing case(30) restricting a housing space for housing powder; a screw or spring for discharging the powder housed in the housing space to the outside; a rotary handle(60) for rotating the screw; and a powder puff case(50) mounting the screw and the rotary handle and having a sponge coupled to an outer side for applying the powder.
Patent KR-20020024227-A (KR)
Inventor: AHN JAE HONG
IPC: G06F12/16
Filed: 2002-02-06
Abstract: PURPOSE: A method of protecting a hard disk through disk blocking is provided to manage the hard disk through the disk blocking, and to install a disk protection interrupt handler while performing a POST(Power-On Self Test) process of a computer, to have control over input/output processes of the hard disk and control a BIOS(Basic Input/Output System) interrupt handler, so as to protect the hard disk before booting an operating system. CONSTITUTION: A hard disk protection system performs a POST process to install a ROM program, and snatches an interrupt INT13 to have control over a disk protection interrupt handler(11). The hard disk protection system controls operations of a hard disk(3) as handling hard disk input/output processes through every INT 13. The hard disk protection system temporarily intercepts system DOS operations, and performs a protection operation for a ROM program driver by setting up a protection processing routine in a predetermined location of the hard disk(3). The hard disk protection system distinguishes a protection area from a non-protection area by concentrating data of the hard disk(3) on one position, and generates a backup file.
Patent KR-20020067638-A (KR)
Inventor: PEETZ JOERG
IPC: H04L12/28
Filed: 2002-02-08
Abstract: PURPOSE: A network comprising a plurality of sub-networks, which are linked via bridge terminals is provided which increase data processing amount between at least two sub-networks under a specific overload condition. CONSTITUTION: The bridge terminal BT1 is synchronized with the subnetwork SN1 and the bridge terminal BT2 with the sub-network(SN2) at the beginning of the MAC frames segment. At time t1, bridge terminal BT1 sends an absence message to the controller of sub-network(SN1) which then acknowledge receipt of the signal (time t2). The bridge terminal is then not synchronized with either the first or the second sub-network(SN1)or(SN2) for a certain period of time. At time t3, bridge terminal BT1 sends a presence message to the controller of the second sub-network(SN2) which then acknowledges receipt of the signal with an acknowledge signal at time t4. After a certain number of MAC frames, bridge terminal BT1 needs to change back over to the first sub-network(SN1). This changeover phase is introduced by an absence message t5. After the acknowledge signal t6, synchronization with the first sub-network(SN1) begins again. This is terminated by a presence message t7 from the first bridge terminal BT1 and an acknowledge signal from the first sub-network SN1 at time t8. The processes for bridge terminal BT2 are the same as those described for bridge terminal BT1.
Patent KR-20030066271-A (KR)
Title: ASAM: Advanced Step Aeration with Media(ASA, SFC-Biofilter)
Inventor: KANG YOUNG TAE
IPC: C02F3/30
Filed: 2002-02-05
Abstract: PURPOSE: Provided is an advanced wastewater treatment apparatus for recycling treated water after wastewater treatment, and particularly provided is an advanced step aeration system with media (ASAM) for increasing removal efficiency of organic material, nitrogen and phosphorous. CONSTITUTION: The apparatus comprises an anoxic sludge zone(1) having a first media therein for deodorizing, an anaerobic zone(2) to which 0.7-0.8Q of wastewater is input, an aerobic zone(3) having a second microorganism media(13) for increasing organic material, nitrogen and phosphorous removal efficiency and an aerator(6) therein, an anoxic zone(4) to which the remainder of the wastewater is input, a reaeration tank(5) with an aerator(7), an air lift pump(8) and a membrane filter(18) therein for improving nitrogen removal efficiency and reusing the treated water, the final settling zone(9) settling treated water and generating excessive sludge, and a biofilter(16) for filtrating treated water, wherein 0.3-0.5Q of the excessive sludge of the final settling zone(9) is returned to the anoxic sludge zone(1).
Patent KR-20030069235-A (KR)
Title: Inner Shield for CRT
Inventor: KIM JAE YEOL
IPC: H01J29/02
Filed: 2002-02-19
Abstract: PURPOSE: An inner shield for a color cathode ray tube is provided to achieve improved terrestrial magnetic drift and thermal drift characteristics, while allowing for ease of operation of thermal compensation unit. CONSTITUTION: A cathode ray tube comprises a shadow mask having electron beam passing holes for selecting colors of electron beams; a frame including a main frame(13) for supporting the shadow mask and a sub frame(14) for supporting the main frame; and an inner shield(9) for shielding terrestrial magnetic fields. The inner shield includes a main portion formed along the inner surface of a funnel and which shields a terrestrial magnetic field applied from an external source; and a skirt portion(16) surrounding the frame and which shields a terrestrial magnetic field. The inner shield is attached to the surface of the sub frame.