baber/WOPTO huggingface dataset:
Patent KR-19990013935-A (KR)
Title: Use of a copolymer with a surface-active structure as a dispersing and/or crushing agent
Inventor: MONGOIN JACQUES
IPC: C09C3/00
Filed: 1998-07-16
Abstract: Use of a copolymer as a dispersion and/or crushing agent for aqueous suspension of mineral materials, namely those materials with hydrophilic or hydrophobic properties; the copolymer comprising: (a) (i) monoacids e.g. (meth)acrylic, (iso)crotonic, and cinnamic; (ii) diacids e.g. fumaric and maleic; (iii) acid anhydrides e.g. maleic anhydride; and (iv) diacid hemiesters such as 1-4C monoesters of maleic acid; (b) optionally at least one unsaturated monomer with a sulphonic group e.g. sodium methallyl-sulphonate or styrene sulphonic acid; or a phosphoric group e.g. propylene glycol (meth)acrylate phosphate; (c) optionally at least one unsaturated monomer without a carboxylic group e.g. (meth)acrylic esters, (meth)acrylonitrile, styrene, (meth)acrylamide; and (d) at least one unsaturated oxyalkyl monomer with terminal hydrophobic chain of general formula: R-Ä-((CH2-CH(R1)-O)m-CH2-CH2-O)n-CH2-CH(R2)-OpÜ< SB>q-R' (where: m, n, p ≤ 100; q is number such that 0 ≤ q x (n + m + p) ≤ 100; R1, R2 = H, methyl, or ethyl; R = polymerisable unsaturated radical belonging to group of esters including (meth)acrylic, crotonic and vinylphthalic, as well as unsaturated urethanes such as (meth)acrylurethane, or allyl-urethane; and R' = hydrophobic radical such as tristyrylphenyl, or 8-30C alkyl, aryl, alkylaryl, arylalkyl; or, when R = urethane, R' = 8C dialkyl, or, preferably, when R = unsaturated polymerisable radical, R' ≥ 22C dialkyl amine; total of (a)+(b)+(c)+(d) = 100 pts.; and suspension has specific viscosity ≤ 25.)
Patent KR-19990068257-A (KR)
Title: 자외선 차단제용 포름아미딘의 제조 방법
IPC: A61K8/30
Filed: 1998-07-23
Abstract: 하기한 화학식 1의 자외선 차단제용 포름아미딘의 제조 방법에 관한 것이다.  이 제조 방법은 아미노벤조에이트, 아닐리드, 촉매 및 유기 용매를 혼합하고, 상기 혼합물을 1차 추출하고, 이 추출물에 재결정 용매를 첨가하여 파우더를 생성하고, 생성된 파우더를 유기 용매에 용해한 후 2차 추출하고, 상기 혼합물을 여과하고 증류하는 공정으로 구성된다. 
     [화학식 1] 
     
       
     
     (식에서, R 1 및 R 2 는 알킬 그룹이고, A는 H, OH 또는 Cl이며, B는 H, 메톡시, 클로린이고 C는 H, Cl, 알킬, 알콕시이다)
Patent KR-19990036574-A (KR)
Title: 패턴 결함 검사 장치 및 패턴 결함 검사 방법
IPC: G01N21/956
Filed: 1998-07-24
Abstract: 본 발명은 검사 속도의 고속화, 장치의 간략화, 검사 대상의 확대 등을 실현하는 패턴 결함 검사 장치 및 패턴 결함 검사 방법을 얻는 것이다. 
     본 발명에 따르면, 상관 회로(24)는 기준 화상 기억부(22)에 기억되어 있는 복수의 기준 화상 중에서 검출 화상 기억부(23)에 기억되어 있는 검출 화상과 가장 상관이 높은 것을 골라 내고, 그 기준 화상을 차분 회로(25)로 입력한다.  차분 회로(25)는 상관 회로(24)에서 입력된 기준 화상과 검출 화상 기억부(23)에서 입력된 검출 화상에 기초하여 양자의 차분 화상을 작성한다.  결함 판정 회로(26)에는 차분 회로(25)에서 차분 화상이 입력되고, 결함 판정 회로(26)는 그 차분 화상에 기초하여 피검 웨이퍼(41)에 존재하는 결함의 위치나 크기 등의 판정을 행한다.  그리고, 그 판정 결과는 결함 정보 가공부(27)로 입력되어 결함 정보로서 출력된다.
Patent KR-20000009542-A (KR)
Title: Ventilation device of elevator
Inventor: KIM WON GAB
IPC: B66B11/02
Filed: 1998-07-25
Abstract: PURPOSE: A ventilation device is provided to possibly install an illuminating device using a space unit of both sides in the center of a ceiling board and to improve the ventilation efficiency by blocking a leakage. CONSTITUTION: The flowed in wind of a ventilation fan is flowed into a vertical leading plate(40) and is led to the lower face(44) side without leaking since blocked by an upper, a lower, a left and a right face sides(43, 44, 45, 46). In addition, the wind of the ventilation fan led to the lower face side of the vertical leading plate is flowed into a supporting plate(50), passing through an air passing hole(47) formed on the lower face(44) and is vented into the car inner part of the elevator through a vent(52) formed on the face of the supporting plate.
Patent KR-20000009868-A (KR)
Title: Apparatus for controlling a voltage supply
Inventor: CHANG SEUNG HO
IPC: H01L21/66
Filed: 1998-07-29
Abstract: PURPOSE: An apparatus for controlling a voltage supply is provided, which can uniformly supplies a voltage to devices tested in burn-in progress and can monitors a voltage supply state, and couples a plurality of channel to a digital/analog converter. CONSTITUTION: The apparatus for controlling a voltage supply comprises: a central processing unit (10) for networking with a burn-in test computer, which a monitoring program is set; a block address decoding unit (20) for outputting an analog/digital converting bit by the zone and a digital/analog converting bit, outputting a system control bit, and adjusting the output of the control signal; a digital/analog converter (28) for outputting channel signals; and analog/digital converter (36) for outputting channel signals to the central processing unit (10) according to the analog/digital converting bit. Since the voltage supply state can to be monitored, the board state can to easily checked.
Patent KR-20000015347-A (KR)
Title: Cut-off circuit for breaking the excessive output of a monitor
Inventor: JANG KI YEONG
IPC: H04N3/19
Filed: 1998-08-28
Abstract: PURPOSE: A cut-off circuit for breaking excessive output of a monitor is provided to sense the excessive current output in a FBT(Fly Back Transformer), and break the excessive current by stopping an operation of a high voltage generator. CONSTITUTION: A cut-off circuit for breaking the excessive output of a monitor, compares voltage outputted from a FBT(Fly Back Transformer) with reference voltage, and stops a high output operation by stopping an oscillation of a horizontal oscillation circuit when the voltage is higher than the reference voltage. The cut-off circuit compares the amount of the output current in the FBT with the amount of the reference current, and stops the oscillation to the horizontal oscillation circuit when the amount of the output current in the FBT is bigger than the amount of the reference current.
Patent KR-19980082145-A (KR)
Title: 바구니 및 그 제작방법
Filed: 1998-08-28
Abstract: 제작이 간단하고 제작단가가 대폭 절감된 바구니 및 그 제작방법에 대해 개시한다. 이 바구니는 상면이 개구되고 소정형상의 수용공간을 가지는 몸체(10)와, 몸체의 외주면에 둘러지면서 감싸지며 복수의 끈들이 소정패턴으로 꼬여져 형성된  띠부재(20)와, 띠부재의 일면에 부착되어 띠부재를 몸체의 외주면에 부착시키는 접착부재(30)를 구비한다. 이러한 바구니는 임의 형태로 사출 제작된 몸체 둘레에 단순히 띠부재를 둘러 감싸도록 부착시킴으로써 비숙련자 일지라도 간단하게 제작이 가능하다. 또한, 합성수지재로 된 몸체에 끈들로된 띠부재들이 감싸지는 구조를 가짐으로써 제작단가를 대폭 절감시킨다.
Patent KR-19980082156-A (KR)
Title: 이동 통신을 이용한 동적 내비게이션 시스템 장치 및 이를 이용한 지능형교통시스템 구축방
Filed: 1998-08-31
Abstract: 종래의 차량용 내비게이션 장치는 GPS를 이용하기 때문에 자신의 정보를 송신하거나 외부의 정보를 수신할 수 없으며 GPS 수신기가 고가이기 때문에 이용에 한계가 많았다. 
     본 발명은 이동통신을 이용하여 이러한 단점을 극복하고 다양한 정보의 송신으로 차량의 상태를 송신할 수 있으며, 교통정보 등의 정보를 수신하여 여러 목적에 따라 사용될수 있는 것을 특징으로 한다. 
     또한 드라이버가 지리정보 등을 저장한 데이터가 없거나 경로탐색 등의 연산을 행할수 있는 장치가 없더라도 이동통신을 이용하여 특정 기능을 수행할 수 있어 별도의 장비가 없어도 자신의 위치와 경로탐색, 교통정보의 수신이 가능해 지리정보에 미숙한 국내인이나 외국인에게 많은 도움을 줄 수 있으며, 교통사고의 예방에 도움을 줄 수 있을 것이다. 
     또한 종래의 지능형교통시스템(ITS)은 건설된 구간의 교통량과 차량속도 만을 파악할수 있었지만, 본 발명은 이동통신을 이용한 동적 내비게이션 장치로 이러한 단점을 극복하여 교통량과 속도는 물론 특정 차량의 상태나 정보까지 파악할 수 있으며 기존의 ITS와 병행 또는 독립하여 구축이 가능해 물류 유통 분야에 많은 도움을 줄 수 있다.
Patent KR-20000018490-A (KR)
Title: Delay synchronization loop equipped with controller for varying unit delay device number of voltage control delay line and method thereof
Inventor: LEE SANG BO
IPC: H03L7/081
Filed: 1998-09-02
Abstract: PURPOSE: A delay synchronization loop equipped with a controller for varying a unit delay device number of a voltage control delay line and a methode thereof is provided to protect a difference of jitter characteristic according to an operation frequency by varying the unit delay device number. CONSTITUTION: The delay synchronization loop equipped with a controller for varying a nunit delay device number of a voltage control delay line and a methode thereof: a phase detector(210) for detecting a phase difference by comparing a phase of an outer clock and a phase of an inner clock; a charge pump circuit(230) for converting the phase difference to a control voltage; a voltage control delay line further comprising a plurality of unit delay devices(250) for generating the inner clock by delaying the outer clock; and a controller(290) for varying the number of the unit delay device by replying to the voltage control to vary a delay time of the voltage control delay line.
Patent KR-19990029634-A (KR)
Title: 스크롤형 압축기
IPC: F04C2/02
Filed: 1998-09-08
Abstract: 스크롤 유압장치는 밀폐 하우징; 밀폐 하우징 내에 배치된 고정 스크롤; 밀폐 하우징 내에 배치되며, 고정 스크롤과 맞물리고, 선회 운동하는 선회 스크롤; 고정 스크롤과 선회 스크롤의 맞물림에 의해 형성된 압축 쳄버; 압축 쳄버에 연결된 흡입 쳄버; 흡입 쳄버로부터 배출 캐비티를 분리하는 구획부; 압축 쳄버와 배출 캐비티 사이에 설치된 방출 밸브; 방출 밸브의 헤드를 조정하기 위한 리테이너; 및 상기 구획부를 통해 연장하여, 방출 밸브와 리테이너를 구획부에 고정시켜 설치된 압력 릴리프 밸브를 구비한다.
Patent KR-20000019091-A (KR)
Title: I-131 capsule assembly and package automation apparatus
Inventor: HONG SOON BOK
IPC: A61J3/00
Filed: 1998-09-08
Abstract: PURPOSE: An automation apparatus is provided which minimizes users' radiation bomb in assembling and packing of I-131 so that improve work efficiency. CONSTITUTION: This apparatus comprises base plate(9) which forms basic part, powder supply device(10) which packs absorbing agent to the lower capsule(3), undiluted chemical distribution device(30) which distributes I-131 solution to a U-from groove, capsule assembly device(50) which assemblies upper and lower capsule(2,3), rubber stopper assembly device(80) which inserts rubber stopper(7) into drug bottle(5) wherein capsules(2,3) are put, bottle capping device(90) which seals drug bottle(5) by metal cap and multi-joint robot(100) which moves capsules(2,3), bottle(5), stopper(7) or metal cap to the work location of each device(10,30,50,70,80,90).
Patent KR-20000021103-A (KR)
Title: Washing machine of no-detergent using ceramic radiating far-infrared rays and supersonic waves
Inventor: CHO BONG AM
IPC: D06F19/00
Filed: 1998-09-25
Abstract: PURPOSE: A washing machine of non-detergent using a ceramic for radiating supersonic waves and far-infrared rays is provided to prevent the generation of washing foul water by using a detergent. CONSTITUTION: A washing machine is equipped devices for generating supersonic waves(30)(40) in a washing tub(10), and the inside of the washing tub(10) is coated with a ceramic for radiating far-infrared rays(100). The radiating ceramic of far-infrared rays(100) comprises of the 60-70wt% SiO2, the 10-15wt% Al2O3, the 1-5wt% Fe2O3, the 5-10wt% TiO2, the 3-8wt% CaO, and the 2-6wt% MnO. When a power is added to the washing machine, many cavitations are generated to offer a strong washing operation into the washing water by the vibrating operation of supersonic waves, and the polluted materials stuck in the washing is removed in a short time without using a synthetic detergent or the other chemicals using the event.
Patent KR-20000025325-A (KR)
Title: Sealing body of net paper bag for wrapping
Inventor: KAMATA SHINO
IPC: B65D33/00
Filed: 1998-10-10
Abstract: PURPOSE: A sealing agent is provided to easily use by safely and firmly sealing an opening unit of a net paper bag without fixing with a stapler. CONSTITUTION: A sheet body(1) is folded into two parts, and if the upper part of a net paper bag(3) for wrapping is inserted between the surface part(11) and the rear part(12) of the folded sheet body, the opening unit(4) of the net paper bag can be covered. Herein, the sheet body is produced with a paper, a non-woven fabric, plastic, and a synthetic resin, and a thermal bonding adhesive(5) is adhered on a spot on the inner face(2) of the sheet body. In addition, the thermal bonding adhesive is arranged, having an interval on one of the inner face of the surface part of the back face part, and the height of the thermal bonding adhesive is 0.2 to 1mm when attached.
Patent KR-20000025681-A (KR)
Title: Method for fabricating capacitor of ferroelectric ram
Inventor: KWON SUN YONG
IPC: H01L27/10
Filed: 1998-10-13
Abstract: PURPOSE: A method for fabricating a capacitor of a ferroelectric RAM is provided to improve adhesive property with an electrode material by oxidizing a surface of a Ti film at an oxygen atmosphere during a short time by use of RTP. CONSTITUTION: In a method for fabricating a capacitor of a ferroelectric RAM, an interlayerfilm(23) is formed on a semiconductor substrate in which a predetermined lower structure is formed. A first adhesive layer(25) is formed on the interlayer film, and then a first RTP process is performed. A thin film(27) for a lower electrode and a dielectric film(29) are formed on the first adhesive layer. The dielectric film, the thin film and the first adhesive layer are patterned by use of a mask for a lower electrode. A capping oxidation film(31) and a second adhesive layer(33) are sequentially formed over the resultant structure, and then a second RTP process is performed. After forming an upper electrode(35) connected to a contact for the upper electrode, a third adhesive layer(37) is formed on a surface of the upper electrode and a third RTP process is performed.
Patent KR-20000027651-A (KR)
Title: Method for manufacturing semiconductor device having soi structure
Inventor: HEO YEON CHEOL
IPC: H01L27/12
Filed: 1998-10-28
Abstract: PURPOSE: A method for manufacturing semiconductor device having SOI(Silicon On Insulator) structure is provided to reduce junction capacitance. CONSTITUTION: A method for manufacturing semiconductor device having SOI structure comprises steps of: forming an insulating film; etching a portion of the insulating film; forming a gate insulating film and a first conductive layer; flattening the first conductive layer; forming a second conductive layer for a gate electrode; a step forming the gate electrode; forming source/drain areas and a contact area; a step forming contact holes; and forming a metal wiring filled in the contact hole. The planarization process is a chemical-mechanical polishing method. The gate electrode is formed by etching the first and second conductive layer using a gate electrode mask. The contact holes are formed by etching an interlayer dielectrics.
Patent KR-20000032580-A (KR)
Title: Fluid sprayer by using electrostatic force
Inventor: YUN YONG SEOB
IPC: B41J2/055
Filed: 1998-11-16
Abstract: PURPOSE: A fluid sprayer is provided to give better performance at a lower cost by using electrostatic force as a driving force. CONSTITUTION: A voltage is fed to an upper and a lower electrode(146,122) and an electrostatic force is generated between the upper and the lower electrode. The size of the electrostatic force is F=delta4V¬2/2D¬2. Herein, the electrostatic force is reacted to the entire area of the upper electrode, a membrane(140) is deformed downward and the volume of a chamber(136) is increased. As much as the increased volume, a fluid flows in the chamber through a fluid supply route. In this state, when power is blocked, the electrostatic force is removed. Thereby, the membrane including the upper electrode is returned to the original state by elasticity, and the flowed in ink is vented out through a nozzle(138).
Patent KR-20000032746-A (KR)
Title: Apparatus and method for transferring document for scanner
Inventor: LEE CHANG BOK
IPC: G06K7/00
Filed: 1998-11-17
Abstract: PURPOSE: An apparatus and method for transferring document for a scanner are provided so that when a document scanning having a high quality is required, a resolution can be progressed by make the document isolate from a transfer path. CONSTITUTION: An apparatus and method for transferring document for a scanner includes a feeding roller (4) for automatically feeding documents continuously and a feeding rubber (5). Transfer rollers (6,7) transfers the document fed from the feeding roller to a unit, a white roller (9) is mounted in face of a scanning unit (8). Badge rollers (10,11) ejects the scanned document from the scanning unit (8) into the badge plate (3). A control lever (4a) is mounted to both ends of the feeding roller (4), an escape hole (14) being inserted the control lever (4a) is formed both sides of the scanner body (1). Since both ends of the feeding roller (4) is always supported elastically toward contacting with the feeding rubber (5), as usual, in the state that the feeding roller (4) is adhered closely with the feeding rubber (5), the control lever (4a) is hooked at the upper end of a vertical hole (14a), in case the feeding roller (4) and the feeding rubber (5) are isolated with each other, the control lever (4a) is moved to a horizontal hole (14b).
Patent KR-20000033651-A (KR)
Title: Winding device for power line of vacuum cleaner
Inventor: KIM DAE CHEOL
IPC: A47L9/26
Filed: 1998-11-25
Abstract: PURPOSE: A winding device for power line of vacuum cleaner is provided which is able to prevent the power line from getting twisted when being rewinded by controlling the speed of code reel. CONSTITUTION: The winding device for power line of vacuum cleaner comprises: (i) a code reel (30) which is placed in the middle of a code reel housing(10) by a shaft(20) and rewinds the power line; (ii) a code reel button(41) which is installed by a hinge(42); (iii) a stop portion(40) comprising a stop rubber(43) which stops the rotation through contact with one side(31) of the code reel(30) by the operation of the code reel button(41) and (iv) a speed controlling portion which is placed between the inside of the code reel button(41) and the side of the code reel(30) and comprises a speed controlling wheel and a fixing hinge.
Patent KR-20000033663-A (KR)
Title: Method for displaying broadcasting channel search in car audio
Inventor: LEE CHANG HO
IPC: G11B25/10
Filed: 1998-11-25
Abstract: PURPOSE: A method for displaying a broadcasting channel search in a car audio is provided to allow a car driver to easily recognize a search result of broadcasting channels and automatically stop the channel search depending on the search result. CONSTITUTION: A channel search display method comprises the steps of: determining whether a receivable broadcasting channel exists by performing a frequency tuning when an automatic channel search function is selected; counting a cycle number of the automatic channel search when the receivable broadcasting channel does not exist; stopping the automatic channel search and displaying a message and alarm advising that a receivable channel does not exist when the counted cycle number is over a designated cycle number; comparing an electric field intensity of a received channel frequency with a reference electric field intensity when a receivable channel exists; and when the electric field intensity of the received channel frequency is smaller than the reference electric field intensity, counting received number of a weak broadcasting channel and stopping the automatic channel search when the counted number is over a reference number.
Patent KR-19990030376-A (KR)
Title: 자기 구동 금형
IPC: B30B15/02
Filed: 1998-12-15
Abstract: 이 발명의 목적은 유체 압력 변동으로 피스톤 로드를 전진 또는 후진 시키는 진퇴기구 양단에 상 금형과 하 금형을 적접 연결하여 금형을 개폐시키므로 별개의 프레스 설비 또는 QDC와 같은 금형 교체 설비가 불필요하고 동력의 낭비 없이 금형을 구동 할 수 있게 하는 자기 구동 금형을 제안함에 있다.  이 발명 금형은 소성 재료를 가압 성형하기 위한 적어도 상금형과 하 금형으로 분할되고;  상 금형과 하 금형은 적어도 하나 이상의 진퇴기구의 양단에 부착되어 진퇴기구의 신축 행정에 지배되어 결합 또는 분리되며;  진퇴기구를 구동하는 하나 이상의 유압 기구는 하나의 유체 압력원에 연결되어 신축 동작이 제어 되도록 구성한 것을 특징으로 하는 것이다.
Patent KR-20000010508-A (KR)
Title: Semiconductor device
Inventor: UCHIDA DOSHIYA
IPC: G11C29/06
Filed: 1998-12-23
Abstract: PURPOSE: The objective is to implement a semiconductor device for a DRAM(Dynamic Random Access Memory) with more than two power voltages. The device operates normally in the voltage conversion circuit though the terminal output is lowered from the lowering power circuit level or from the resistance-causing voltage drop. CONSTITUTION: The semiconductor device has the first power circuit(11) that creates the first power voltage, the second power circuit(12) that creates the second power voltage with higher voltage, and the second power level detection circuit(23) that detects the second power voltage. Based on the detection result of the second power level detection circuit(23), the first power circuit(11) lowers the first power voltage to be always lower than the second power voltage. Thus, the threshold of the inverter connected to the first power voltage is lowered. And the reverse operation of this inverter is possible with only the signal of the second power voltage and the problem that the output of the voltage conversion circuit drops to the middle level is prevented.
Patent KR-20000042702-A (KR)
Title: Circuit for controlling duplexing device access bus in exchange
Inventor: CHA HYEON YEOUL
IPC: G06F15/16
Filed: 1998-12-26
Abstract: PURPOSE: A circuit for controlling a duplexing device access bus in an exchange is provided to smoothly perform a switching process when a duplexing standby process is switched even when malfunctions, resetting processes, board ruptures of an active processor are generated, and to automatically switch each device according to duplexing control signals without a circuit for selecting a corresponding processor. CONSTITUTION: A circuit for controlling a duplexing device access bus in an exchange comprises a first controlling circuit(50) and a second controlling circuit(60). The first/the second controlling circuits comprise common signal outputting circuits(51,61), signal detecting circuits(52,62), sudden signal outputting circuits(53,63), signal adjusting circuits(54,64), and signal selecting circuits(55,65). The first controlling circuit controls a duplex switching of a first processor, connected through an exchange device and a first bus. The second controlling circuit controls a duplex switching of a second processor, connected through the exchange device and a second bus. The common signal outputting circuits analyze duplex-related signals to generate common control signals, and output the common control signals. The common control signals control a duplexing of a magnetic bus. The signal detecting circuits receive duplexing control signals from the common signal outputting circuits. The signal detecting circuits analyze the signals to output detecting signals according to the analyzed signals. The sudden signal outputting circuits receive other side detecting signals, reset signals, signals for other side board ruptures and functional statuses. The sudden signal outputting circuits generate driving setup signals according to the received signals, and output the generated driving setup signals. The signal adjusting circuits receive the common control signals to adjust the signals to a clock. The signal adjusting circuits output signals which is set up when sudden situations occur, according to the output driving setup signals. The signal selecting circuits receive the signals output from the signal adjusting circuits. The signal selecting circuits receive the output detecting signals, and outputs the duplexing control signals to the exchange device, according to whether or not signal values of the detecting signals and the duplexing control signals are equal.
Patent KR-20000043647-A (KR)
Title: Head drum assembly
Inventor: YU DAE SEON
IPC: G11B5/48
Filed: 1998-12-29
Abstract: PURPOSE: A head drum assembly is provided to reduce the numbers of components and processes by directly installing a video head on the bottom of an upper drum without using a spacer. CONSTITUTION: A drum motor(42) is installed on the upper surface of an upper drum(20), and a head mounting bracket(22) is formed on the outer side of the lower surface of the upper drum. The head mounting bracket is processed on the outer portion of a rotor(40) while having plural grooves(23). And, an audio head mounting groove(24) is formed in one part of the head mounting bracket. Herein, the height of the audio head-mounting groove contains a certain difference from the height of the upper surface of the head-mounting bracket. And, the audio head mounting groove is formed near the place for a video head(25) on the head installing bracket. Therefore, the video head is simply installed by using a combining tool(27).