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    • 93. 发明专利
    • Diaphragm for speaker
    • 背景音箱
    • JPS58221594A
    • 1983-12-23
    • JP10494182
    • 1982-06-17
    • Matsushita Electric Ind Co Ltd
    • TAKEDA KOUJIYAMAMOTO TOORUKOBAYASHI TERUO
    • H04R7/02
    • H04R7/02
    • PURPOSE:To improve both frequency characteristics and durability of a speaker diaphragm, by using a composite film of polybisphenol phthalate resin and talc to produce a diaphragm. CONSTITUTION:A film is produced by compounding properly talc to polybisphenol phthalate resin composed of aromatic carboxylic acid such as isophthalic acid, telephtalic acid, etc. or a mixture of these two acids and bivalent phenol such as bisphenol A. This film has a high elastic modulus of 21,000- 52,000kg/cm with a large loss of 0.021-0.035. This ensures the reproduction up to a high frequency with a diaphragm using said film, and furthermore the variance of frequency characteristics can be reduced.
    • 目的:通过使用聚苯二甲酸苯二甲酸酯树脂和滑石的复合膜来提高扬声器隔膜的频率特性和耐久性,以产生隔膜。 构成:通过适当地将滑石与由间苯二甲酸,电话酸等芳香族羧酸组成的聚苯酚邻苯二甲酸酯树脂或这两种酸和二价苯酚如双酚A的混合物合成来制备薄膜。该薄膜具有高弹性 模量为21,000〜52,000kg / cm 2,损耗大于0.021-0.035。 这样可以通过使用所述膜的隔膜确保高频再生,此外可以减小频率特性的变化。
    • 94. 发明专利
    • Measuring device for surface potential
    • 表面电位测量装置
    • JPS5780570A
    • 1982-05-20
    • JP15747880
    • 1980-11-07
    • Matsushita Electric Ind Co Ltd
    • YAMAMOTO KAZUMASAKOBAYASHI TERUOHARA NORIAKI
    • G01R29/12G01R29/24G03G15/00
    • G01R29/24
    • PURPOSE:To measure potential of a specimen in electrostatic copying machines accurately in non-contacting state, by a method wherein mechanism to interrupt incident electric flux and an electrode with direct connection of FET are constituted. CONSTITUTION:An electrode 17 enclosed in stepped part of an insulator 14 is connected to gate of FET16 enclosed in a cylindrical cap 11 provided with an electric flux entering hole 13. Using a detecting element 21 in such constitution, potential of a measuring specimen 18 in application of voltage from DC power source 19 is measured. A substrate 20 having the detecting element 21 thereon is provided with an electromagnet 22 and a shutter 23, and the shutter 23 is moved in reciprocation by the electromagnet 22 and front part of the hole 13 is opened or closed. Line of electric force extending from the measuring specimen 18 to the electrode 17 in the detecting element 21 is interrupted by the shutter 23, thereby voltage is induced between drain and source of the FET16 and by utilizing this voltage the surface potential of the measuring specimen 18 is measured at non-contacting state.
    • 目的:为了在非接触状态下准确测定静电复印机中的试样的电位,通过构成中断入射电流的机构和直接连接FET的电极的方法。 结构:封闭在绝缘体14的阶梯部分中的电极17连接到FET16的栅极,FET16的栅极被包围在设置有电流通入孔13的圆筒形盖11中。使用检测元件21,将测量样品18的电位 测量来自直流电源19的电压的施加。 其上具有检测元件21的基板20设置有电磁体22和闸板23,并且闸板23由电磁体22往复运动,并且孔13的前部部分被打开或关闭。 从测量样品18延伸到检测元件21中的电极17的电力线被快门23中断,从而在FET16的漏极和源极之间感应出电压,并且通过利用该电压,测量样品18的表面电位 在非接触状态下测量。