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    • 2. 发明授权
    • Double-converting FM tuner
    • 双转换FM调谐器
    • US4236252A
    • 1980-11-25
    • US10019
    • 1979-02-06
    • Yasuo KominamiMasanori IenakaTakeshi WadaYukihiko MiyamotoTsuneo Yamada
    • Yasuo KominamiMasanori IenakaTakeshi WadaYukihiko MiyamotoTsuneo Yamada
    • H03D7/16H04B1/10H04B1/26H04B1/28
    • H04B1/26H03D7/161H04B1/28
    • A first intermediate frequency amplifier stage which executes the amplitude limiting operation of a double-converting FM tuner employing the integrated circuit technology is constructed in the form of an integrated circuit. An output signal of the first intermediate frequency amplifier stage is put into a square pulse waveform on the basis of the amplitude limiting operation, and therefore has higher harmonic components of high frequencies. When the higher harmonic components are injected into a second mixer circuit in a second frequency converter circuit, various higher harmonic components which have frequencies higher than a second intermediate frequency appear at the output of the second mixer conduit. When the higher harmonic components at the output of the second mixer circuit are injected into an FM demodulator circuit, beat trouble is induced. The second frequency converter circuit is also constructed in the form of an integrated circuit, and filter means to pass the fundamental waves of a first intermediate frequency signal and to reject the higher harmonic frequency components thereof is connected between the output of the first intermediate frequency amlifier stage executing the amplitude limiting operation and the input of the second mixer circuit, whereby the beat trouble can be prevented.
    • 采用集成电路技术执行双转换FM调谐器的幅度限制操作的第一中频放大器级以集成电路的形式构成。 第一中频放大器级的输出信号在幅度限制运算的基础上被置入方波脉冲波形,因此具有高频谐波分量。 当在第二变频器电路中将高次谐波分量注入第二混频器电路时,在第二混频器导管的输出处出现具有高于第二中频频率的各种高次谐波分量。 当第二混频器电路的输出端的高次谐波分量被注入到FM解调器电路中时,会引起节拍故障。 第二变频器电路也以集成电路的形式构成,滤波器装置将第一中频信号的基波通过,并将其高次谐波频率成分排除在第一中频放大器的输出端 执行振幅限制操作和第二混频器电路的输入,从而可以防止节拍故障。
    • 4. 发明授权
    • Monostable multivibrator circuit with clamped non-saturating common
emitter amplifier in feedback path
    • 单稳态多谐振荡器电路,在反馈路径中具有钳位非饱和公共发射极放大器
    • US4277703A
    • 1981-07-07
    • US2108
    • 1979-01-09
    • Takeshi WadaMasanori IenakaYukihiko MiyamotoTsuneo Yamada
    • Takeshi WadaMasanori IenakaYukihiko MiyamotoTsuneo Yamada
    • H03K3/013H03K3/02H03K3/023H03K3/0232H03K5/08H03K3/033
    • H03K3/023
    • This invention relates to a monostable multivibrator which is operated in the non-saturated state. The monostable multivibrator circuit includes a time constant circuit which has a capacitor, an amplifier circuit which receives an output signal of the time constant circuit, a positive feedback circuit which is connected between an output end of the amplifier circuit and an input end of the time constant circuit, and a trigger terminal which is disposed in a circuit loop constructed of the time constant circuit, the amplifier circuit and the positive feedback circuit; and it is characterized in that the positive feedback circuit comprises a signal amplifying transistor which has a base receiving an output of the amplifier circuit and a collector supplying a signal to the time constant circuit, and a level clamp circuit which is coupled to the collector of the transistor in order to hold a collector output potential of the transistor higher than a base input potential thereof.
    • 本发明涉及在非饱和状态下工作的单稳态多谐振荡器。 单稳态多谐振荡器电路包括具有电容器的时间常数电路,接收时间常数电路的输出信号的放大器电路,连接在放大器电路的输出端和时间常数电路的输入端之间的正反馈电路 恒定电路和触发端子,其设置在由时间常数电路,放大器电路和正反馈电路构成的电路回路中; 其特征在于,正反馈电路包括信号放大晶体管,其具有接收放大器电路的输出的基极和向时间常数电路提供信号的集电极,以及电平钳位电路,其耦合到 该晶体管为了保持晶体管的集电极输出电位高于其基极输入电位。
    • 9. 发明申请
    • ILLUMINATING DEVICE AND DISPLAY DEVICE
    • 照明设备和显示设备
    • US20120320623A1
    • 2012-12-20
    • US13581381
    • 2011-03-01
    • Takeshi Wada
    • Takeshi Wada
    • F21V8/00
    • G02F1/133615G02B6/0088G02B6/009
    • An illuminating device includes a light guide plate; a light source that is located opposite at least two adjacent end faces of four end faces of the light guide plate; and a chassis that has an opening through which light emanating from a light emission surface of the light guide plate passes. At least one optical sheet that includes a corner portion with an interior angle of greater than 90 degrees in a position corresponding to a corner portion of the light guide plate that is sandwiched between the two end faces opposite the light source is disposed between the light emission surface of the light guide plate and the chassis.
    • 照明装置包括导光板; 光源,其与所述导光板的四个端面的至少两个相邻的端面相对; 以及具有从导光板的发光面发出的光通过的开口的底架。 至少一个光学片包括在对应于导光板的夹在与光源相对的两个端面之间的导光板的角部的位置处具有大于90度的内角的角部, 导光板和底盘的表面。