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    • 53. 发明授权
    • MgAl2O4-system dielectric ceramic composition and method for fabricating dielectric ceramic using the same
    • MgAl2O4系介电陶瓷组合物及其制备方法
    • US06673731B2
    • 2004-01-06
    • US10152221
    • 2002-05-20
    • Jin Woo HahnDong Young KimSang Seok LeeTae Goo Choy
    • Jin Woo HahnDong Young KimSang Seok LeeTae Goo Choy
    • C04B35443
    • C04B35/443C04B2235/3203C04B2235/77
    • The present invention relates to a ceramic dielectric material for communication components, which can be used in the microwave and millimeter wave frequency band. More particularly, the present invention relates to a dielectric ceramic composition for the microwave/millimeter wave frequency band having a very high quality factor and a low dielectric constant, and a method of manufacturing the dielectric ceramic using the same. The dielectric ceramic composition consists of spinel (MgAl2O4) as a major component and a small amount of lithium carbonate (Li2CO3) as a sub composition with a specific composition formula. The dielectric ceramic is manufactured from magnesia (MgO), alumina (Al2O3) and lithium carbonate (Li2CO3) as raw materials and through the ceramic processing of calcination, shaping and sintering. The obtained dielectric ceramic has the quality factor (Q×f) of 160,000 and the dielectric constant (&egr;r) of 8.5. Composition formula: MgAl2O4+xLi2CO3(mol %) where, 0
    • 本发明涉及可用于微波和毫米波频带的通信部件用陶瓷电介质材料。 更具体地说,本发明涉及具有非常高的品质因数和低介电常数的用于微波/毫米波频带的电介质陶瓷组合物,以及使用该电介质陶瓷的方法。 电介质陶瓷组合物由作为主要成分的尖晶石(MgAl 2 O 4)和作为具有特定组成式的亚组合物的少量碳酸锂(Li 2 CO 3)组成。 电介质陶瓷由氧化镁(MgO),氧化铝(Al2O3)和碳酸锂(Li2CO3)为原料,通过陶瓷加工煅烧,成形和烧结制成。 所获得的介电陶瓷的品质因子(Qxf)为160,000,介电常数(ε)为8.5。组成式:其中,0
    • 55. 发明授权
    • Video blanking system for a video cassette recorder combined with a
video camera
    • 视频消隐系统,用于与录像机相结合的录像机
    • US5089898A
    • 1992-02-18
    • US371828
    • 1989-06-27
    • Dong Young Kim
    • Dong Young Kim
    • H04N5/225H04N5/228H04N5/265H04N5/77H04N5/91H04N5/93H04N9/74
    • H04N5/9305H04N5/265H04N5/77H04N5/91
    • A video blanking system for a VCR combined with a video camera which enables the picture to occupy the screen gradually and to be gradually removed from the screen at the start and at the end of recording respectively as if a curtain rises or falls across the front of the screen. The video blanking system includes a key input device for selecting a blanking function, a device for blanking a video signal from a camera section to a VCR section, a device for separating the video signal into vertical and horizontal synchronizing signals, and a signal processing device which sends a control signal to the blanking device in proportion to a period which corresponds to the number of horizontal synchronizing signals equal to the vertical synchronizing input to the signal processing device.
    • 一种用于与录像机结合的摄像机的视频消隐系统,其使得图像能够逐渐占据屏幕并且在记录的开始和结束时逐渐从屏幕上移除,就好像帘幕上升或下降 屏幕。 视频消隐系统包括用于选择消隐功能的按键输入装置,用于将视频信号从相机部分消隐到VCR部分的装置,用于将视频信号分离为垂直和水平同步信号的装置,以及信号处理装置 该信号与对应于等于对信号处理装置的垂直同步输入的水平同步信号的数量的周期成比例地向消隐装置发送控制信号。