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1. 发明专利

JPS56138317A ELASTIC SURFACE WAVE ELEMENT 失效
公开(公告)号：JPS56138317A
公开(公告)日：1981-10-28
申请号：JP4183380
申请日：1980-03-31
申请人： FUJITSU LTD , NIPPON DENPA KOGYO KK
发明人： SATOU HIROAKI , NISHIYAMA SHIGEO , TODA YOSHIFUMI
IPC分类号： H03H9/145 , H03H3/08 , H03H9/02
摘要： PURPOSE:To suppress the production of discharge based on the pyroelectricity when a rapid temperature change is caused, by covering the crystal surface except the energizing converter and reception converter with electric conductor and covering the residual surface including the converters with resistive film. CONSTITUTION:On the surface of the piezoelectric crystal plate 41 having pyroelectricity, the reed-screen-shaped electrode by the conductive thin film is formed with photoetching, one reed-screen electrode is taken as the energizing converter converter 12R is covered with the metallic film 42 being electric 12S and another reed-screen electrode is taken as the reception converter 12R. The surface of the crystal plate 41 except the energizing converter 12S and reception conductor and the surface forming the converters 12S, 12R is covered with the resistive film 43. The film thickness (h) of the resistive film 43 and the specific resistivity rho are obtained so that rho/h is ohms - >=10 ohms at room temperature. Further, if rapid temperature change is caused to the crystal plate 41, the production of discharge based on the pyroelectricity is suppressed, allowing stable operation.

2. 发明专利

JPS6219089B2 失效
公开(公告)号：JPS6219089B2
公开(公告)日：1987-04-27
申请号：JP4183380
申请日：1980-03-31
申请人： NIPPON DENPA KOGYO KK , FUJITSU KK
发明人： SATO HIROAKI , NISHAMA SHIGEO , TODA YOSHIFUMI
IPC分类号： H03H9/145 , H03H3/08 , H03H9/02

3. 发明专利

JP2000078095A Terminal equipment 有权
标题翻译：终端设备
公开(公告)号：JP2000078095A
公开(公告)日：2000-03-14
申请号：JP24871098
申请日：1998-09-02
申请人： Fujitsu Ltd , 富士通株式会社
发明人： SATO TSUTOMU , TODA YOSHIFUMI , TAKAHASHI KOICHI
IPC分类号： H04L5/16 , H04J3/00 , H04J3/06 , H04L7/00 , H04L7/08
摘要： PROBLEM TO BE SOLVED: To maintain synchronization without complicating configuration in a terminal equipment forming the communication path of a TDD system by being synchronized with a transmission path. SOLUTION: This terminal equipment is provided with a clock supplying means 11 for generating a clock whose official frequency is equal to the frequency of a transmitting/receiving time slot, a transmission/reception buffering means corresponding to the transmitting/receiving time slot, an outgoing link corresponding means 14 for storing a frame given through a reception time slot and including the field of a variable word length in a reception buffering means, a reception control means 12 for reading the frame to obtain outgoing transmission information, a transmission control means 13 for storing incoming transmission information in a transmission buffering means, an up-link corresponding means 17 for transmitting a frame including outgoing transmission information to the transmission path, a frame detecting means 18 for detecting the leading of the frame given from the transmission path, and a synchronization correcting means 19 for initializing a clock supplying means when one of the transmitting/receiving buffering means is full at the time point of this leading.
摘要翻译：要解决的问题：通过与传输路径同步，在形成TDD系统的通信路径的终端设备中保持同步而不使配置复杂化。解决方案：该终端设备设有时钟提供装置11，用于产生官方频率等于发送/接收时隙的频率的时钟，对应于发送/接收时隙的发送/接收缓冲装置，链接对应装置14，用于存储通过接收时隙给出的帧，并且在接收缓冲装置中包括可变字长度的字段;接收控制装置12，用于读取帧以获得输出传输信息;传输控制装置13，用于将传入传输信息存储在传输缓冲装置中，上行链路对应装置17，用于将包括传出传输信息的帧发送到传输路径;帧检测装置18，用于检测从传输路径给出的帧的前导;以及同步校正装置19，用于当时钟提供装置之一初始化时钟提供装置 e发送/接收缓冲装置在该导频的时间点满。

4. 发明专利

JPH10174167A DIGITAL PORTABLE TELEPHONE SET 失效
公开(公告)号：JPH10174167A
公开(公告)日：1998-06-26
申请号：JP32958296
申请日：1996-12-10
申请人： FUJITSU LTD
发明人： TODA YOSHIFUMI , SUZUKI YOJI
IPC分类号： H04J1/02 , H04B1/40 , H04B7/26 , H04Q7/38 , H04W88/06
摘要： PROBLEM TO BE SOLVED: To attain the reduction of circuit scale by generating all the transmission local signals of analog and digital bands and a received 1st local signal when a 1st intermediate frequency(IF) for reception is different in the case of receiving the analog and digital signals at a digital portable telephone for performing frequency divided multichannel access while using analog and digital frequency bands. SOLUTION: On the side of reception, wide band pass filters 101 and 103, low noise amplifier 102 and 1st mixer 104 have wide band characteristics for covering the analog and digital bands from 810MHz to 885MHz. The digital transmission frequency band (940-956MHz) and the analog transmission frequency band (925-940MHz) are adjacent and a local signal for high frequency is supplied to the 1st mixer 104 on the side of reception and a modulator 119 on the side of transmission as one system of 925-956MHz so that simplification is attained.

5. 发明专利

JPH06276093A FREQUENCY SYNTHESIZER 失效
公开(公告)号：JPH06276093A
公开(公告)日：1994-09-30
申请号：JP5890593
申请日：1993-03-18
申请人： FUJITSU LTD
发明人： TODA YOSHIFUMI , KOBORI SATOSHI , SASAKI SUSUMU , KOBAYASHI TOSHIMITSU
IPC分类号： H03L7/16 , H03L7/18 , H03L7/22
摘要： PURPOSE:To securely switch the frequency of an output signal fast at fine frequency intervals as to the frequency synthesizer which obtains an output signal of desired frequency by performing a frequency synthesizing process for a signal giving a reference frequency. CONSTITUTION:This frequency synthesizer is equipped with frequency synthesizing means 111-11N which generate intermediate-frequency signals by performing indirect type frequency synthesizing processes individually for the input signal giving the reference frequency on the basis of frequency division ratios variably set from outside and a signal generating means 13 which generates the output signal of desired frequency by performing a frequency synthesizing process for the intermediate-frequency signals generated by the frequency synthesizing means 111-11N.

6. 发明专利

JPH0548483A FREQUENCY CONVERSION CIRCUIT 失效
公开(公告)号：JPH0548483A
公开(公告)日：1993-02-26
申请号：JP20199091
申请日：1991-08-12
申请人： FUJITSU LTD
发明人： TODA YOSHIFUMI , ONODA MASAHIRO
IPC分类号： H04B1/26 , H03J7/06
摘要： PURPOSE:To improve the frequency stability of an intermediate frequency signal by providing 1st and 2nd frequency conversion means to the conversion circuit, detecting the frequency deviation of a 2nd intermediate frequency signal from the output of the 2nd frequency conversion means and controlling the local oscillation frequency of the 1st and 2nd frequency conversion means based on the deviation. CONSTITUTION:When the frequency stability of a reception signal is high, only a frequency deviation DELTAfL1 of a 1st local oscillation signal appears as a frequency deviation at a conversion output of the 1st frequency conversion means 11 and a frequency deviation DELTAfL1 of the 1st local oscillation signal and a frequency deviation DELTAfL2 of the 2nd local oscillation signal appear at a conversion output of a 2nd frequency conversion means 12. Then the frequency deviations DELTAfL1, DELTAfL2 are detected from a frequency difference detection means 13. Based on the detection output, the 1st and 2nd local oscillation frequencies are controlled by the frequency control means 14 from the frequency difference detection means 13, then the frequency deviations DELTAfL1, DELTAfL2 are eliminated from the conversion output of the frequency conversion means 12. Thus, even when the frequency stability of the reference oscillation circuit is low, the 2nd intermediate frequency signal with high frequency stability is obtained.

7. 发明专利

JPH0454006A AMPLIFIER 失效
公开(公告)号：JPH0454006A
公开(公告)日：1992-02-21
申请号：JP16439590
申请日：1990-06-22
申请人： FUJITSU LTD
发明人： KOBAYASHI TOSHIMITSU , TODA YOSHIFUMI
IPC分类号： H03F1/00 , H03F3/60 , H03F3/68 , H03F3/72 , H03G3/20
摘要： PURPOSE:To prevent adverse effect on other amplifier units by interrupting a power voltage of an amplifier unit when a signal through a diode is interrupted at the stop of the amplifier unit and starting application of power voltage before the diode reaches the signal conduction state at restart. CONSTITUTION:Amplifier units 151-15m are not stopped by simply turning off a power voltage. That is, an amplifier unit to be stopped is disconnected one by one from other amplifier units by using a switch of the amplifier unit to be stopped among switches 131-13m and 161-16m and then the power supply is interrupted. When an amplifier unit is started again, the power voltage is not simply applied, but after the start of application of the power voltage, the amplifier unit is gradually connected (in the case of use of a diode). Thus, adverse effect on other amplifier units is minimized in the stop of the amplifier unit and in the stop of restart.

8. 发明专利

JPH0423605A AMPLIFIER DEVICE 失效
公开(公告)号：JPH0423605A
公开(公告)日：1992-01-28
申请号：JP12953490
申请日：1990-05-18
申请人： FUJITSU LTD
发明人： TODA YOSHIFUMI , KOBAYASHI TOSHIMITSU
IPC分类号： H03F3/60 , H01P5/02 , H01P5/12 , H03F3/68
摘要： PURPOSE:To interrupt electrically a desired amplifier unit from other units without giving effect on the other amplifier units by providing a switch respectively between an input terminal of each amplifier unit and ground and between an output terminal and ground in the amplifier device in which plural amplifier units are connected in parallel. CONSTITUTION:An input terminal 10 is branched into (m) through a circulator 11 and a transmission line TL 12 and the branched lines are connected respectively to m-sets of transmission lines 131-13m. A signal via the transmission lines 131-13m is separately to amplifier units 151-15m. One terminal of transmission lines 171-17m connects to each output terminal of the amplifier units 151-15m and the other terminal connects to a transmission line 18. Moreover, switches SW141-14m are connected between the input terminal of the amplifier units 151-15m and ground and switches SW161-16m are connected between the output terminal of the amplifier units 151-15m are ground respectively. When only the transmission lines 131, 171 are selected electrically to be connected to ground, the line is short-circuited at points A, B and opened at points A', B' thereby interrupting the amplifier unit 151 equivalently.

9. 发明专利

JPH03265333A LINEAR PHASE MODULATION CIRCUIT 失效
公开(公告)号：JPH03265333A
公开(公告)日：1991-11-26
申请号：JP6488990
申请日：1990-03-15
申请人： FUJITSU LTD
发明人： TODA YOSHIFUMI
IPC分类号： H04L27/20
摘要： PURPOSE:To realize simple constitution without phase distortion by driving a control voltage of a class C power amplifier with an output of a compensation device so as to apply amplitude modulation to a constant amplitude PSK(Phase Shift Keying) modulation wave. CONSTITUTION:The circuit consists of a serial/parallel converter 1, a differential code converter 2, a mapping circuit 3, an orthogonal modulator 4, low pass filters 5, 6, a square mean value adder 7, and a class C power amplifier 8 or the like. Then a PSK modulation wave with a constant amplitude is generated from I and Q axis components, and the I and Q axis components are separately subject to band limit, the square mean sum is taken to generate an envelope signal of a PSK modulation wave. When the constant amplitude PSK modulation wave is amplified by the class C power amplifier 8, the control voltage of the class C power amplifier 8 is driven by the envelope signal to amplitude- modulate the constant amplitude PSK modulation wave. Thus, no phase distortion is caused and simple constitution is attained.

10. 发明专利

JPH0237677A GROUNDING STRUCTURE OF PORTABLE RADIO EQUIPMENT 失效
公开(公告)号：JPH0237677A
公开(公告)日：1990-02-07
申请号：JP18458588
申请日：1988-07-26
申请人： FUJITSU LTD
发明人： TOMURA MASASHI , TAKAGI HISAMITSU , TODA YOSHIFUMI , FUTAMURA KAZUHIRO
IPC分类号： H01R4/64 , H01Q1/10 , H01Q1/24 , H01Q1/48 , H04B1/38
摘要： PURPOSE:To prevent variance in contact pressure by arranging a contact spring which comes in contact with a specified point in a retracting position of a retractable antenna and on the side surface of the retractable antenna and by connecting the contact spring either to a metallic case or to a frame. CONSTITUTION:The end portion 1a of a rod antenna 1 is made slightly thicker in diameter than that of the main portion 1b of the rod antenna 1. The rod antenna 1 and its end portion 1a are guided with a rib groove 2 formed on a metallic case side. A projection 3 is provided at a position corresponding to a specified contact point of the end portion 1a in the retracted position of the rod antenna 1. A contact spring 4 is fit and fixed between the projection 3 and an upright wall 2c of the other side of the guide groove 2 or the opposite side of the projection 3 so as to hold the end portion 1a from both sides thereof. As a result, when the contact spring 4 is fit into the upright wall 2c, the end portion 1a of the rod antenna 1 is squeezed on both sides thereof between the projection 3 and the contact spring 4 with a specified contact pressure with the rod antenna 1 in its retracted position. This prevents the contact pressure from varying.

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