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1. 发明申请

WO2008078918A1 METHACRYLATE RESIN WITH EXCELLENT DISCOLORATION-RESISTANCE AND TRANSPARENCY AND METHOD FOR PREPARING THE SAME 审中-公开
标题翻译：具有优异的耐腐蚀性和透明性的甲基丙烯酸酯树脂及其制备方法
公开(公告)号：WO2008078918A1
公开(公告)日：2008-07-03
申请号：PCT/KR2007/006730
申请日：2007-12-21
申请人： CHEIL INDUSTRIES INC. , JEONG, Jae Hoon , HA, Doo Han , JANG, Jung Ho
发明人： JEONG, Jae Hoon , HA, Doo Han , JANG, Jung Ho
IPC分类号： C08F20/06 , C08F2/44 , C08F2/18 , C08F2/20
CPC分类号： C08F120/18 , C08F2/10 , C08F2/20 , C08F20/06 , C08F20/12 , C08F20/14 , C08F20/18 , C08F120/14 , C08F220/06
摘要： One aspect of the invention relates to a methacrylate resin prepared by suspension poly¬ merization wherein a poly alkylacrylate- acrylic acid is used as a suspension stabilizer. The suspension stabilizer is used in an amount of about 0.05 to about 0.25 parts by weight per 100 parts by weight of a monomer mixture. Another aspect of the invention relates to a method for preparing a methacrylate resin, which comprises: preparing a mixture by mixing an initiator and a chain-transfer agent with a monomer mixture comprising at least about 50 % by weight of alkyl methacrylate; and adding the mixture to an aqueous solution of polyalkylacrylate-acrylic acid to conduct suspension poljmerization.
摘要翻译：本发明的一个方面涉及通过悬浮聚合制备的甲基丙烯酸酯树脂，其中使用聚丙烯酸烷基酯 - 丙烯酸作为悬浮稳定剂。悬浮稳定剂的用量为每100重量份单体混合物约0.05至约0.25重量份。本发明的另一方面涉及一种制备甲基丙烯酸酯树脂的方法，其包括：通过将引发剂和链转移剂与包含至少约50重量％的甲基丙烯酸烷基酯的单体混合物混合来制备混合物; 并将混合物加入到聚丙烯酸烷基酯 - 丙烯酸的水溶液中以进行悬浮聚合。

2. 发明申请

WO2003067753A1 DIGITAL PWM INPUT D CLASS AMPLIFIER BY PWM NEGATIVE FEEDBACK 审中-公开
标题翻译：数字PWM输入D类放大器通过PWM负反馈
公开(公告)号：WO2003067753A1
公开(公告)日：2003-08-14
申请号：PCT/KR2002/001817
申请日：2002-09-27
申请人： DIGITAL AND ANALOG CO., LTD , YI, Seung-Mok , JEONG, Jae-Hoon , CHO, Goog-Chun , CHO, Bo-Hyung , KIM, Chang-Gyun , PARK, Jong-Hu
发明人： JEONG, Jae-Hoon , CHO, Goog-Chun , CHO, Bo-Hyung , KIM, Chang-Gyun , PARK, Jong-Hu
IPC分类号： H03F3/217
CPC分类号： H03F3/217
摘要： Disclosed is a digital PWM input D class amplifier by PWM negative feedback. The amplifier includes: digital modulation part for modulating PCM signal of input audio to PWM signal; pulse width generating and correcting part for comparing difference between the PWM signal and output signal negatively fed back, with PWM ramp signal to generate PWM switching signal; output part for generating an amplified output audio signal in response to the PWM switching signal of the pulse width generating and correcting part; and voltage negative feedback loop for negatively feeding back signal of the output part and decreasing a harmonic component to provide the signal to the pulse width generating and correcting part. Thus, the invention compares the negative feedback signal with positive/negative (+/-) saw tooth PWM ramp signal to control On/Off time period of switching transistor and the PWM pulse width and thereby enhance the linearity of the output PWM:
摘要翻译：公开了通过PWM负反馈的数字PWM输入D类放大器。放大器包括：用于将输入音频的PCM信号调制为PWM信号的数字调制部分; 脉冲宽度产生和校正部分，用于比较PWM信号和负反馈的输出信号之间的差异，并用PWM斜坡信号产生PWM开关信号; 输出部分，用于响应脉冲宽度产生和校正部分的PWM切换信号产生放大的输出音频信号; 和电压负反馈环路，用于对输出部分的信号进行负反馈，并减少谐波分量，以向脉冲宽度产生和校正部分提供信号。因此，本发明将负反馈信号与正/负（+/-）锯齿PWM斜坡信号进行比较，以控制开关晶体管的开/关时间和PWM脉冲宽度，从而提高输出PWM的线性度：

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