baber/WOPTO huggingface dataset:
Patent KR-20010076767-A (KR)
Title: DNS Based Adaptive Location Update Mechanism for Internet Host Mobility
Inventor: CHO IN JUN
IPC: H04L12/28
Filed: 2000-01-28
Abstract: PURPOSE: A method for registering COA(Care-Of-Address) and establishing a path based on DNS(Domain Name System) in mobile communicating environment is provided to enable a communication service closed to the existing Internet capacity in a multimedia data communication application and remote mobile host service application by allowing a source host to be propagated only COA of a mobile host and to use the COA in establishing a path. CONSTITUTION: An MH(Mobile Host) present an address of its own HA(Home Agent) to FA(Foreign Agent) and requests to register a COA in the HA(11). The FA transfers the COA of MH to the HA in MH, and the HA maintains the current COA(12). The HA propagates the current COA of MH to a DNS server where the MH has registered, and the DNS server stores the COA of MH(13). The COA of MH is piggyback and propagated to an SH(Source Host)(14). The SH transfers packets to the FA on a direct path(15).
Patent KR-20010077598-A (KR)
Inventor: KIM HAN SAENG
IPC: H04B10/40
Filed: 2000-02-03
Abstract: PURPOSE: A small form factor transceiver module using silicon optical bench is provided to use an internal standard MT-RJ connector or an LC connector by making a new type of transceiver module having the half size of the existing transceiver module. CONSTITUTION: On an SiOB(Silicon Optical Bench)(142), an LD(Laser Diode) subassembly having a laser diode for transmitting an optical signal and a PD(Photo Detector) subassembly having a photo detector for receiving optical signal are integrated. On a PCB(Printed Circuit Board)(141), an LD subassembly driving circuit that applies and derives electrical signal to the LD subassembly in order to generate an optical signal from the electrical signal, and a PD subassembly driving circuit that converts the optical signal received in the PD to an electrical signal, are formed. A plastic package covers the PCB on which the SiOB has been mounted, and seals the PCB in the form of small form factor.
Patent KR-20000024368-A (KR)
Title: Internet billing method and system
Inventor: LEE SANG WON
IPC: G06Q20/10
Filed: 2000-02-10
Abstract: PURPOSE: An internet charging system is provided to be easy for a charging according an information use through an internet. CONSTITUTION: An internet charging system comprises a charging center(400), a content provider (300) connected to the charging center, and a charging gateway(500) for interfacing the charging center and a finance company, and charges a content use cost of an internet user(100a). The content provider(300) comprises a web server and a charging agent. The web server makes the internet user connected to the content provider through a web and employ a content. After passing through an identification step and the money confirming step according to a request of the user through a communication with the charging center, the charging agent transfers a service corresponding to a request of a user and information to various charging to a charging server.
Patent KR-20000062545-A (KR)
Title: 무선망에서의 다운링크 파워 할당 방법 및 시스템
IPC: H04B7/005
Filed: 2000-02-11
Abstract: 무선망에서 다운링크 파워 할당방법은 정해진 무선 주파수 유효범위 영역에 대해 목표 수행 목적이 만족되게 하는 다운링크 송신파워를 결정한다.  기지국은 전자기적 송신을 송신한다.  전자기적 송신의 수신된 신호 파라미터는 정해진 무선 주파수 유효범위 영역 내의 측정위치에서 측정된다.  데이터 처리 시스템은 측정위치의 함수로서 전자기적 송신에 관련된 전파율을 결정한다.  데이터 처리 시스템은 유효범위 영역에 대한 적어도 하나의 목표 수행 목적과 전파율에 기초하여 기지국 중 적어도 한 기지국에 대한 다운링크 송신파워를 결정한다.
Patent KR-20010081262-A (KR)
Title: An apparatus for watching door state
Inventor: MIN BYEONG JUN
IPC: H04W4/12
Filed: 2000-02-11
Abstract: PURPOSE: An apparatus for monitoring the status of a door is provided so that a resident can simply confirm the door status of his place of residence in a remote place using a mobile terminal. CONSTITUTION: An apparatus for monitoring the status of a door is comprised of a sensor(10), a timer(20), a Bluetooth module(40), a keypad(60), LEDs(Light Emitting Diodes)(51,52), an LED driving part(50), and a control part(30). The sensor(10) senses the locking status of a door lock(L) continuously. The timer(20) counts the lapse of time continuously. The Bluetooth module(40) transmits a lock release state of the door lock(L) sensed by the sensor(10) to a destination in the form of a radio frequency signal. The keypad(60) is provided with a mode setup button for mode setup. The LEDs(51,52) visually output and display a mode set by the keypad(60). The LED driving part(50) drives the LEDs(51,52). The control part(30) controls processing dependent on mode setup by the keypad(60) and the data movement between each of the components.
Patent KR-20010081296-A (KR)
Title: An advertising system and a method of indicating homepage being without domain
Inventor: PARK HYUN CHUL
IPC: G06F17/00
Filed: 2000-02-11
Abstract: PURPOSE: An advertising system and the method thereof for displaying a home page not having a domain name are provided to move and search a user to a personal home page without making out the domain of the home page, and to make out one's own home page in the screen of the advertisement. CONSTITUTION: A user's computer(100) performs the production and edit of a home page. An Internet(200) is a path for transferring information requesting the production and edit of the user's home page. A web server(300) receives the request of the production and edit of the user's home page according to the user's request and then transmits the home page production result according to the user's intention. The web server(300) includes a database unit(310) for storing the contents of each user's home page and the information of a plurality of members. A database module(320) calls the information stored to the database unit(310) and manages according to the user's request. A search engine(330) performs information search according to the request of the user's supplemental information. A link module(340) performs the connection between the plurality of members' home page and other web pages. A data transceiver module(350) transmits the information stored to the database unit(310) according to the user's request.
Patent KR-20010083426-A (KR)
Inventor: KIM YONG JUN
IPC: A61K8/97
Filed: 2000-02-12
Abstract: PURPOSE: Provided is salt for massage comprising rose which has an effect of multiple complex skin care including cleansing, sterilization, disinfection, antiinflammatory and humidifying effects of rose, as well as removes waste materials from skin due to the osmoregulation of salt. CONSTITUTION: The salt for massage comprises parched salt, rose, rose hip(the fruit of rose), menthol extracted from mint, and olive oil. The salt is treated at a temperature of at least 300 deg.C to evaporate water and remove impurities. The treatment at such a high temperature allows the milling and water-solubility of salt to facilitate. The rose and rose hip are dried at a low temperature to reduce the loss of perfume and active ingredients. The rose and rose hip should be generally dried at a temperature of 36 to 40 deg.C. The low temperature-dried rose and rose hip are milled to facilitate the solubility of the active ingredients. The menthol, olive oil and essential oil of rose are then added to the milled rose and rose hip. The mixture is then milled again, combined and stored for a given period to infiltrate the active ingredients into the salt.
Patent KR-20000030253-A (KR)
Inventor: MA YOUNG MIN
IPC: G06Q30/00
Filed: 2000-02-16
Abstract: PURPOSE: A system and method for providing recipient load telephone service connected to one-click of icon inserted into other company or other person home page on internet is provided to directly talk with a client as a cost load of a web service provider by identifying a detailed buying condition to a goods through a direct conversation when buying the goods through an internet shopping mole. CONSTITUTION: A telephone service request web server(12) is connected to a client computer (10) through an internet(30), and transmits a document having a URL(uniform resource locator) and a telephone of a consultant terminal(20) to the client computer(10). A telephone service providing web server(14) is initially connected to the client computer(10) through the internet(30), and converts a voice signal of a client into a voice data according to a VoIP(voice over internet protocol) to transmit the converted voice data through the internet(30). The telephone service providing web server(14) downloads a program for converting the voice data transmitted through the internet(30) into a voice signal in the client computer(10), receives the telephone of the consultant terminal(20) from the client computer(10), and sets a communication channel between the client computer(10) and the consultant terminal(20).
Patent KR-20000036348-A (KR)
Inventor: KIM JUNG GON
IPC: E04F13/00
Filed: 2000-02-16
Abstract: PURPOSE: An interior material for construction by using sawdust is provided to have excellent durability and adherence by mixing adhesive to the sawdust for spraying on the inner wall of various structures before being hardened. CONSTITUTION: Sawdust is mixed with an adhesive composed of polyethylene, polypropylene, phenol resin, and urethane. If the amount of sawdust and adhesive is small, the mixing process is operated by hand. If the amount of sawdust and adhesive is large, the mixing process is operated by a mixer. Then, a certain color pigment is added to the adhesive for improving the appearance of a wall. Herein, the sawdust is prepared by collecting in a carpenter's shop or by collecting and crushing waste wood to lowering producing cost.
Patent KR-20010087665-A (KR)
Title: A grease injection apparatus for semiconductor device manufacture equipment
Inventor: LEE MYEONG SEOK
IPC: H01L21/027
Filed: 2000-03-08
Abstract: PURPOSE: A grease injection device in a semiconductor manufacturing system is provided to supply rapidly grease to a drive component such as a lead screw by improving a structure of a grease injection device. CONSTITUTION: A stage(110) of an exposure system(100) is moved by a stepping motor(122), a lead screw ball(124), and an X and Y-axis driver. A hole(126a) is formed in a bearing portion of the lead screw(124). The hole(126a) is filled with grease. A nozzle of an injection tube of a grease injection portion is connected with the hole(126a). A process for injecting the grease is controlled by a control portion(22). Namely, the grease injection process is performed in accordance with a switching operation of a switching valve(20) controlled by the control portion(22).
Patent KR-20000062819-A (KR)
Title: 아크릴 수지로 제조된 도광판의 제조방법
IPC: G02F1/1335
Filed: 2000-03-10
Abstract: 본 발명은 용융된 아크릴 수지를 금형 내에 사출율 약 1000cm 3 /초 이상으로 충전함을 특징으로 하는 아크릴 수지로 제조된 도광판의 제조방법에 관한 것이며 이러한 방법에 따라 두께가 얇은 도광판에서도 잔류하는 왜곡이 작은 도광판을 제조할 수 있다.
Patent KR-20000036507-A (KR)
Inventor: CHUNG KYU OK
IPC: F04B1/00
Filed: 2000-03-18
Abstract: PURPOSE: An elliptically moving piston type compressor is provided to remove the pulsation of fluid and noise and vibration due to the pulsation of fluid and prevent mixing of lubricant and exhaust gas, thereby improving durability. CONSTITUTION: An elliptically moving piton type compressor includes a power generator(1a), a cylindrical fixing frame(2a), a plurality of cylinders(3a), a piston(4a), a piston driving shaft(5a), and a fixing shaft(6a), wherein the fixing frame mounted with a detachable cover(2b) is fixed outside an opening of a casing of the power generator, inserted with a driving shaft(1b) and fixed with a rotation plate(1c) at an end part, and the fixing shaft is inwardly mounted in the center of the frame, and has suction and discharge passages(6b,6b-1,6c,6c-1) separated by partition walls(6f,6f-1), and suction and discharge holes(6d,6d-1,6e,6e-1) respectively connected to corresponding suction/discharge passages, wherein the frame and cover are provided inside with a pair of guide rails(2c,2c-1) in the shape of ellipse of which center is the same with the rotation center of the driving shaft, the rotation plate is formed with a plurality of radially integral cylinders(3a) to be rotatably installed on an outer periphery of the fixing shaft, and the integral cylinders have a combined suction/discharge passage(3c) on a head part(3b) to be connected to the suction and discharge passages of the fixing shaft and a straight guide groove(3d) on both side walls to install the driving shaft mounted with the piston.
Patent KR-20010095672-A (KR)
Title: Manufacturing method for a filter using yellow earth
Inventor: CHO KYUNG HOON
IPC: B01D39/20
Filed: 2000-04-11
Abstract: PURPOSE: A manufacturing method of water purifying filter using loess is provided, which can as well remove harmful material completely by forming extremely fine filtration holes as sterilize bacteria by using loess as a main component that radiates far infrared ray of a strong bactericidal activity. The method can also reduce the production cost greatly by mass production using heating and drying method of loess. CONSTITUTION: The method includes (i) mine underground loess at a fixed depth lower than 50 cm for preventing any impurities; (ii) mix mineral powder that consists of alum powder, zeolite powder and other mineral powder and loess powder to ratios of 5-15: 5-15: 10: 40-95; (iii) heat the mixture to 950-1200 deg.C for calcination; (iv) pulverize the calcined mixture to 150-2500 mesh; and (v) collect the powder through fan for forming water purifying filter.
Patent KR-20000037356-A (KR)
Inventor: CHEONG MYEONG SEON
Filed: 2000-04-19
Abstract: PURPOSE: A multi-banner is provided to perform one banner on the several banner function, to selectively obtain the several information and to move to the several pages at the same time, by dividing one banner into several region and connecting the divided regions to another pages respectively. CONSTITUTION: A multi-banner is composed of a banner advertisement(50) having prescribed image size and file capacity. The banner advertisement(50) divides a first region(52), a second region(54) and a third region(56). The first region(52) connects to a shopping mall(60), the second region(54) connects to a homepage(70) and the third region(56) connects to a web mail(80).
Patent KR-20010097225-A (KR)
Inventor: LEE HAK YONG
IPC: H01Q1/24
Filed: 2000-04-20
Abstract: 본 발명은 폴더형 단말기의 구조에서 인체(특히 두뇌)에 미치는 유해한 전자파 영향을 줄이고 사용자가 폴더형 단말기를 사용 할 때  보다 편리하게 사용할 수 있게 반 자동으로 열리는 연결 구조와 단말기 안테나를 내장형으로 하는 것을 목적으로 한다. 
     이를 위하여 폴더형 단말기 구조를 도1과 도2에 나타내었고, 내장형 단말기 안테나는 도3에 나타내었고 자동으로 열리는 연결 구조 도4에 나타내고 었다.
Patent KR-20000077069-A (KR)
Title: 반도체메모리장치
IPC: G11C29/08
Filed: 2000-04-22
Abstract: 단순화된 회로구성 및 배선으로 리프레시카운터검사를 정상적으로 실행할 수 있는 반도체메모리장치가 제공된다.  본 발명의 반도체메모리장치에 따르면, 모든 뱅크들의 열디코더들은, 리프레시카운터검사를 실행할 때, 리프레시명령이 공급된 후 공급되는 쓰기명령 또는 읽기명령에 근거하여 활성화된다.
Patent KR-20010097715-A (KR)
Inventor: CHOI SANG YONG
IPC: H04L12/66
Filed: 2000-04-25
Abstract: 1. 청구범위에 기재된 발명이 속한 기술분야 
     본 발명은 인스턴트 메세징 및 씨티아이를 이용한 그룹웨어 운영 시스템 및 그 방법과 상기 방법을 실현시키기 위한 프로그램을 기록한 컴퓨터로 읽을 수 있는 기록매체에 관한 것임. 
     2. 발명이 해결하려고 하는 기술적 과제 
     본 발명은, 기업의 결재, 문서관리, 회의 및 메세지 전달 등의 기능을 인스턴트 메세지 형태로 제공하여 업무처리를 실시간으로 수행하고, 씨티아이를 연동하여 사외에서도 전화, 팩스 또는 무선단말기 등을 이용하여 사내 그룹웨어와 연결하여 메세지나 결재서류의 도착여부를 통보받을 수 있고, 필요한 문서의 수신과 결재서류에 서명을 할 수 있는 그룹웨어 운영 시스템 및 그 방법과 상기 방법을 실현시키기 위한 프로그램을 기록한 컴퓨터로 읽을 수 있는 기록매체를 제공하고자 함. 
     3. 발명의 해결방법의 요지 
     본 발명은, 제 1 또는 제 2 메세징 클라이언트를 통해 인스턴트 메세징 수단에 접속된, 사용자의 정보를 수신하는 제 1 단계; 상기 인스턴트 메세징 수단이 상기 제 1 또는 제 2 메세징 클라이언트의 작업선택 신호를 수신하는 제 2 단계; 및 상기 제 1 또는 제 2 메세징 클라이언트의 작업선택 결과에 따라, 문자메세지 전송작업, 전자결재 작업, 문서관리 작업, 회의진행 작업, 일정 등록 및 열람 작업 또는 팩스 내용을 등록, 발신 및 확인하는 작업 중 어느 하나의 작업을 수행하는 제3 단계를 포함함. 
     4. 발명의 중요한 용도. 
     본 발명은 그룹웨어 시스템 등에 이용됨.
Patent KR-20010098156-A (KR)
Inventor: HAN SEONG HUI
IPC: F02D41/06
Filed: 2000-04-28
Abstract: 본 발명은 가솔린 엔진의 시동시 공기량 학습 적용에 의한 시동성 개선방법에 관한 것으로 특히, 엔진의 회전수를 검출하는 엔진회전수 검출센서(1)와; 냉각수의 온도를 냉각수온 검출센서(2)와; 상기 엔진회전수 검출센서(1)와 냉각수온 검출센서(2)의 출력신호를 입력받아 자체내에 기억되어 있는 공기량 결정함수와 합습치 데이타 맵을 통해 시동시 가솔린 엔진에서 필요로 하는 공기량을 산출하여 아이들 스피트 엑츄에이터(4)로 출력시켜 주는 전자제어 유니트(3)와; 상기 전자제어 유니트(3)의 출력신호에 부응하여 작동되어 엔진에서 필요로 하는 공기량을 공급시켜 주는 아이들 스피드 엑츄에이터(4)로 구성된 가솔린 엔진의 시동 제어장치를 제어함에 있어서, 상기 전자제어 유니트(3)에서 시동시 엔진의 회전수와 냉각수온을 각각 입력받아 기 입력된 수온 및 엔진회전수에 따른 함수(Fn)를 통해 기본 공기량을 결정하는 과정과; 기 입력되어 있는 합습치 데이타 맵으로 부터 현재 냉각수온에 따른 최적의 학습치를 검출해 내어 상기 과정에서 계산된 기본 공기량 결정값에 곱해주는 방식을 공기량에 대한 듀티를 결정하여 아이들 스피드 엑츄에어터(4)의 개구량을 결정하는 과정으로 제어하여 원하지 않는 공기량의 손실을 미연에 방지할 수 있음은 물론 저온 시동에 따른 신뢰도를 대폭 향상시킬 수 있도록 한 것이다.
Patent KR-20010100503-A (KR)
Inventor: YOO SEOK YONG
Filed: 2000-05-03
Abstract: 본 발명은 알루미늄 계열의 합금소재를 제조하기 위한 방법에 관한 것으로서, 고 효율성과 저비용으로 다른 합금계에 비해 고가인 알루미늄계 합금 소재를 대량생산이 가능토록 한 것이다. 
     본 발명의 목적은 세선화 된 알루미늄 섬유를 원하는 형상으로 제품화 하는 공정의 효율성을 기하고 이에 따른 제작비용감소를 이룰 수 있도록 하기 위한 것이다. 
     이를 위한 본 발명은 알루미늄계 합금을 용융상태에서 세선화 하여 알루미늄계 섬유를 제조하는 공정; 상기 세선화 된 알루미늄계 섬유를 모아 놓고 이들이 응집되도록 가압하는 공정; 상기 응집된 알루미늄계 블록을 원하는 제품의 형상으로 성형하는 압출공정으로 이루어진다.
Patent KR-20010102740-A (KR)
Inventor: JUNG MUN YEONG
IPC: H02K7/075
Filed: 2000-05-08
Abstract: 본 발명은 이동통신용 단말기 내에 설치되는 편평형 진동모터의 전기자 코일 안쪽 공극에 소프트 페라이트 또는 규소 강판 등 자심을 삽입함으로써 이동 통신용 단말기 모터의 효율을 극대화시키도록 한 자심을 삽입한 편평형 진동모터에 관한 것이다  종래기술은 전기자 코일 내부에 공극을 둠으로써 자속의 누설량이 증가되어 모터의 효율이 저하되므로 소비전력이 증가하고 결과적으로 배터리의 충전 후 사용되는 시간을 단축하는 문제점이 있었다. 
     본 발명은 전기자 코일(120)을 한 쪽에 배치하고 합성수지로 일체로 성형하여 이루어진 편심 로터(100)와; 상기 편심 로터(100)의 중심에 배치된 축(110)과;  상기 축을 통해서 상기 편심 로터(100)를 회전이 자유롭게 지지하는 하우징과;  상기 하우징의 일부에 배치되어 상기 편심 로터(100)에 자속을 공급하는 마그넷(160)과;  상기 마그넷(160)의 내측에 상기 하우징의 일부에 배치된 브러시(170)와; 상기 브러시의 선단과 미끄럼 접촉되도록 상기 편심 로터(100)에 배치된 정류기(180)를 구비한 편평형  진동모터에 있어서, 상기 전기자 코일(120) 안쪽 공극에는 소프트 페라이트 또는 규소강판 등 투자율이 높은 자심(200)을 삽입 구성하여 자속의 누설량을 극소화하여 모터의 효율을 극대화시키도록 함을 특징으로 한다.
Patent KR-20010105653-A (KR)
Title: Apparatus and method of advicing information for marry
Inventor: HAN BYEONG CHANG
IPC: G06F17/30
Filed: 2000-05-17
Abstract: An electrode arrangement for an array of electrically-controllable elements comprises a series of generally parallel electrodes (16) each for extending along a respective line of the electrically-controllable elements, and a series of driver lines (20(1-6)) for receiving driving signals. Each electrode is connected to a plurality of the driver lines each via a respective impedance (26). Each electrode is so connected to at least three of the driver lines. Additionally or alternatively, the driver lines are so connected to the electrodes such that the driver lines cannot be split into a pair of arbitrary groups of the driver lines for which (a) each group has generally the same number of driver lines and (b) each electrode is so connected to at least one of the driver lines in one of the groups and to at least one of the driver lines in the other of the groups. This enables the ratio of the number of electrodes to the number of driver lines to be increased. The impedances in combination with a decoder (24) provide a decoding system which is arranged to perform a plural-stage process in determining which of the driver lines to stimulate in response to each electrode address value supplied to the decoder. This enables the network configuration of the impedances to be machine generated, and also enables the decoder to calculate on the fly which driver lines to stimulate in response to each address value. Furthermore, different resolutions may be provided to enable groups of the electrodes to be addressed simultaneously. The invention is applicable, for example, to liquid crystal displays, arrays of memory elements and arrays of sensors such as light-sensors.
Patent KR-20010105719-A (KR)
Title: Method for bonding reinforced glass to panel for color cathode ray tube
Inventor: LEE GEUN PIL
IPC: H01J31/00
Filed: 2000-05-17
Abstract: The present radiator pertains to a planar array antenna for sending or receiving linear polarized waves, with two radiator levels each comprising radiator elements mounted in lines and columns, while the elements of each radiator level are coupled on a central point so as to be equal in phase and amplitude. Both radiator levels receive and transmit mutually perpendicular polarized waves, and each radiator element has shades (6) and a linear excitated stripline (16, 16', 16a, 16b). Said striplines (16, 16', 16a, 16b) are linked in pairs to the branch ends (15, 31) of the coupling networks (1, 2), and the striplines (16, 16', 16a, 16b) of each pair are mounted on the axis or arranged in an axially parallel configuration; the free ends of both striplines (16, 16', 16a, 16b) are connected through at least one connection line (32, 33, 34, 36) to a branch end (15, 31), and a 180° phase difference between both radiator elements (6, 16) is obtained by using at least one connection line (32, 33, 34) of a stripline (16, 16', 16a, 16b).
Patent KR-20000054262-A (KR)
Inventor: KIM HO KWANG
IPC: G06F3/14
Filed: 2000-05-30
Abstract: PURPOSE: A method and device for changing graphic work scene in game producing tool is provided to make it easy to change a present work scene by dividing scene of a game producing tool and reducing/displaying a whole background scene on part of the divided scene and magnifying/displaying a scene which an user want to work presently on part of the rest of the divided scene. CONSTITUTION: A method for changing graphic work scene in game producing tool includes six steps. A first step is to divide scene of display means into a whole scene displaying area in which reduced whole scene is displayed and a work scene displaying area in which the whole scene of normal magnification is displayed but only present work area is displayed on present display means. A second step is to establish work scene establishing means in the whole scene displaying area. A third step is to divide each displaying area into block.(A1) A fourth step is to give block number to blocks of the whole scene displaying area and blocks of the work scene displaying area respectively.(A2) A fifth step is to match block numbers given to each displaying area one another.(A2) A sixth step is to display an area corresponding to a selected scene on the work scene displaying area if a work scene, which an user wants to change on the whole scene displaying area, is selected through the work scene selecting means.(A3,A4)
Patent KR-20010020929-A (KR)
Title: Glass-ceramics for a light filter and a light filter
Inventor: GOTO NAOYUKI
IPC: C03C10/04
Filed: 2000-05-31
Abstract: PURPOSE: To obtain a glass ceramic for an optical filter having thermal expansion characteristics for avoiding the variation of refractive index in a use temperature of a filter member formed in a monolayer or a multilayer film according to increase in precision of bandpass filter (a substrate material is made to have a high coefficient of thermal expansion, consequently a film is provided with compression stress and temperature stability of refractive index of film is improved) and mechanical characteristics taking durability into consideration in which the substrate material itself has excellent light transmittance. CONSTITUTION: This glass ceramic has 95x10-7 to 140x10-7/deg.C coefficient of thermal expansion at-20 to 70deg.C, preferably >=85 GPa Young's modulus, >=10 kg/mm2 flexural strength in a board material of 10 mm thickness, >=60% light transmittance at 95-1,600 nm wavelength. The main crystal phase of the glass ceramic comprises preferably lithium disilicate and at least one or more selected from α-quartz, α-quartz, α-cristobalite, α-quartz solid solution and α-cristobalite solid solution.