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1. 发明授权

US5175875A Radio communication apparatus with programmable signal modulation 失效
标题翻译：具有可编程信号调制的无线电通信设备
公开(公告)号：US5175875A
公开(公告)日：1992-12-29
申请号：US502680
申请日：1990-04-02
申请人： Satoshi Yokoya , Takayuki Inoue , Nobutaka Takao , Noboru Someno
发明人： Satoshi Yokoya , Takayuki Inoue , Nobutaka Takao , Noboru Someno
IPC分类号： H04B7/26
CPC分类号： H04B7/26
摘要： A radio communication apparatus comprising a modulating portion for modulating a carrier with a signal to transmit so as to produce a transmissible signal; a signal transmitting portion for transmitting the transmissible signal; a level adjusting portion for adjusting a level of the signal to transmit or a level of a control signal used for controlling the transmissible signal in accordance with digital control data supplied to the level adjusting portions; a memory for storing digital adjusting data; and a control unit for reading the digital adjusting data from the memory and supplying the level adjusting portion with the digital adjusting data read from the memory or modified digital adjusting data obtained based on the digital adjusting data read from the memory as the digital control data.

2. 发明授权

US5029236A Radiotelephone apparatus 失效
标题翻译：无线电话设备
公开(公告)号：US5029236A
公开(公告)日：1991-07-02
申请号：US516187
申请日：1990-04-30
申请人： Hiroshi Yasuda , Satoshi Yokoya , Nobutaka Takao , Akira Todo
发明人： Hiroshi Yasuda , Satoshi Yokoya , Nobutaka Takao , Akira Todo
IPC分类号： H04B1/036
CPC分类号： H04B1/036
摘要： A radiotelephone apparatus employed as a so-called portable telephone or a car telephone includes an outer casing, a chassis base plate provided in the outer casing and mounting an electronic circuit section containing above all a heated element or elements, and a fan containing section containing a heat sink and a fan device connected in a heat conductive relation with the chassis base plate. The electronic circuit section and the fan containing section within the outer casing are isolated from each other by an air current interrupting device for air cooling heated electronic components while preventing dust and dirt in the air from flowing into portions in the casing other than the fan containing section. An air intake window is provided in the vicinity of mechanically operating portion of the apparatus for self cleaning dust and dirt sucked by the air flow through the normal telephone operation.

3. 发明授权

US5020138A Radio communication apparatus having cooling means 失效
标题翻译：具有冷却装置的无线通信装置
公开(公告)号：US5020138A
公开(公告)日：1991-05-28
申请号：US500507
申请日：1990-03-28
申请人： Hiroshi Yasuda , Satoshi Yokoya , Nobutaka Takao
发明人： Hiroshi Yasuda , Satoshi Yokoya , Nobutaka Takao
IPC分类号： H04B1/036 , H04Q7/32
CPC分类号： H04B1/036
摘要： A radio communication apparatus has a modulating portion for modulating a carrier with a signal to be transmitting so as to produce a transmission signal. A signal transmitting portion causes the transmissible signal to be subjected to power amplification. The transmissible signal is transmitted after having been subjected to power amplification. A cooling device is provided for cooling by force a heat source contained in the signal transmitting portion in response to a condition detector for detecting a temperature condition or an operating condition of the signal transmitting portion. An operation control unit is operative to cause the cooling device to be in operation when a particular temperature condition in which temperature of the signal transmitting portion has exceeded a predetermined value or a particular operating condition in which the signal transmitting portion has been in a predetermined state is detected by the condition dectector.

4. 发明授权

US5036301A Filter apparatus 失效
标题翻译：过滤装置
公开(公告)号：US5036301A
公开(公告)日：1991-07-30
申请号：US500481
申请日：1990-03-28
申请人： Nobutaka Takao , Satoshi Yokoya , Kotaro Takagi
发明人： Nobutaka Takao , Satoshi Yokoya , Kotaro Takagi
IPC分类号： H03H1/00 , H05K1/02 , H05K3/34
CPC分类号： H05K1/0243 , H03H1/00 , H05K2201/0715 , H05K2201/09336 , H05K2201/09618 , H05K2201/09809 , H05K2201/1006 , H05K2201/10356 , H05K2201/10371 , H05K2201/1053 , H05K2201/10969 , H05K3/3447
摘要： A filter apparatus comprised of a multi-layer printed circuit board has a shielded filter with input and output terminals protruding from the circuit board, when the filter is mounted on the printed circuit board. Two insulating substrates form the printed circuit board, and a connective conductive pattern is formed on an inner surface of one of the substrates that faces the other substrate. Conductive layers are formed on respective outer surfaces of the substrate opposing the connection conductive pattern, wherein at least one of the input and output terminals of the filter is connected to the connective conductive pattern and the conductive layers are grounded, thereby shielding the connective conductive pattern.

5. 发明授权

US5334945A Power control circuit 失效
标题翻译：电源控制电路
公开(公告)号：US5334945A
公开(公告)日：1994-08-02
申请号：US21238
申请日：1993-02-23
申请人： Satoshi Yokoya , Nobutaka Takao
发明人： Satoshi Yokoya , Nobutaka Takao
IPC分类号： H03G3/20
CPC分类号： H03G3/3042
摘要： A power control circuit for use in radio transmitters such as portable telephone sets includes a power amplifier for amplifying the power of a transmission signal to obtain an output signal; control circuits for controlling the amplitude of the signal output by the power amplifier; a limiter for partially limiting the amplitude of the signal from the power amplifier in order to obtain a limited signal; a multiplication circuit for multiplying the limited signal from the limiter and part of the signal from the power amplifier in order to acquire a multiplied signal; a low-pass filter for extracting a DC component of the multiplied signal from the multiplication circuit; and a comparison circuit for comparing the DC component from the low-pass filter with a reference voltage in order to obtain a comparison output. The comparison output from the comparison circuit is supplied to the control circuits, and the control circuits control the level of the signal from the power amplifier so that the DC component from the low-pass filter will become equal to the reference voltage regardless of temperature change.
摘要翻译：用于诸如便携式电话机的无线电发射机中的功率控制电路包括用于放大发射信号的功率以获得输出信号的功率放大器; 用于控制由功率放大器输出的信号的幅度的控制电路; 限制器，用于部分地限制来自功率放大器的信号的幅度，以便获得有限的信号; 乘法电路，用于将来自限幅器的限制信号和来自功率放大器的信号的一部分相乘以获得相乘的信号; 低通滤波器，用于从乘法电路中提取相乘信号的直流分量; 以及用于比较来自低通滤波器的DC分量与参考电压的比较电路，以便获得比较输出。来自比较电路的比较输出被提供给控制电路，并且控制电路控制来自功率放大器的信号的电平，使得来自低通滤波器的DC分量将变得等于参考电压，而与温度变化无关。

6. 发明授权

US5408691A Radio transmitter apparatus which optimizes load impedance to maximize output transmitter efficiency while preserving minimum battery power output 失效
标题翻译：无线电发射机设备优化负载阻抗以最大限度地提高输出发射机效率，同时保持最小电池电量输出
公开(公告)号：US5408691A
公开(公告)日：1995-04-18
申请号：US143523
申请日：1993-10-26
申请人： Nobutaka Takao
发明人： Nobutaka Takao
IPC分类号： H03F1/02 , H03F1/56 , H04B1/034 , H04B1/04 , H04B1/40
CPC分类号： H04B1/0458 , H03F1/0233 , H04B1/40 , H04B2001/045
摘要： A radio transmitter apparatus arranged such that transmission efficiency is improved by switching the load impedance on the final stage in response to the power source voltage or the transmission output power.
摘要翻译：一种无线电发射机装置，其布置成通过响应于电源电压或传输输出功率切换最终级的负载阻抗来提高传输效率。

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