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1. 发明专利

JPS61163775A CLAMPING CIRCUIT 失效
公开(公告)号：JPS61163775A
公开(公告)日：1986-07-24
申请号：JP361785
申请日：1985-01-12
申请人： MITSUBISHI ELECTRIC CORP
发明人： HARA KEN
IPC分类号： H04N5/18
摘要： PURPOSE:To shorten a vertical blanking period by constituting a titled clamping circuit so that a clamp pulse of a vertical synchronizing part is eliminated and the clamping circuit body is operated by a clamp pulse having no signal in this vertical synchronizing part. CONSTITUTION:A video input signal 11 is amplified by an AC amplifying circuit 12, and thereafter, inputted to a clamping circuit body 13. On the other hand, a synchronizing signal 14 is inputted to a differentiating circuit 15, and thereafter, a clamp pulse of a vertical synchronizing signal period is eliminated by a vertical pulse eliminating circuit 22. A clamp pulse 23 which has been obtained in this way is applied to the clamping circuit body 13, by which as for a video signal, a part corresponding to this pulse is reproduced to a prescribed DC value. In this case, as for the clamp pulse 23, no signal exists in a part corresponding to a vertical synchronizing signal, therefore, since the video signal is only discharged by a discharge time constant of the clamping circuit body 13, the displacement of its DC value is small, and immediately after the vertical synchronizing signal has been ended, a video signal 25 whose DC value has been regenerated correctly is obtained.

2. 发明专利

JPS564979A HARDCOPY UNIT 失效
公开(公告)号：JPS564979A
公开(公告)日：1981-01-19
申请号：JP8091179
申请日：1979-06-25
申请人： MITSUBISHI ELECTRIC CORP
发明人： HARA KEN , YAMAI TAKAO
IPC分类号： H04N5/76 , G06F3/153 , H04N1/23 , H04N1/40
摘要： PURPOSE:To obtain a hardcopy unit superior in versatility in terms of a change in recording density, etc., by equipping a threshold circuit, synchronous separating circuit, delay circuit, sampling circuit and recorder. CONSTITUTION:Input signal 31 is converted by threshold circuit 32 into a binary signal, which is input to sampling circuit 36. Synchronous separating circuit 34 detects horizontal and vertical synchronising pulses in input signal 31 and then supplies them to delay circuit 35. Delay circuit 35 gives horizontal synchronizing pulses a lag varying gradually and supplies them as sampling pusles to samping circuit 36. At cycles equal to vertical synchronizing pulses, recorder 33 linescans on a paper surface and while scanning lines are cganged in sequence for every vertical synchronizing pulse, the output of sampling circuit 36 is recorded.

3. 发明专利

JPH0197069A GAMMA-CORRECTING CIRCUIT 失效
公开(公告)号：JPH0197069A
公开(公告)日：1989-04-14
申请号：JP25531487
申请日：1987-10-09
申请人： MITSUBISHI ELECTRIC CORP
发明人： HARA KEN
IPC分类号： H04N5/202
摘要： PURPOSE:To reduce unnecessary capacity and to use voltage-dividing resistances for the video circuit of a high frequency band by constituting a switch circuit through the use of a switching transistor and permitting it to select the voltage- dividing resistances changing the amplitude of an input signal. CONSTITUTION:In a state that the input signal is not supplied to an input terminal 1, a voltage (potential) E0 which is obtained by voltage-dividing a supply voltage +B in the resistances 18 and 19 of the switch circuit 11 is impressed on the base of a switching transistor 13. When the input signal is supplied to the input terminal 1, the input signal is outputted from the emitter of an impedance converting transistor 2 to the base of the switching transistor 12. When the input signal is large and the base potential of the transistor 12 becomes lower than E0, the switching transistor 14 comes to a conductive state, and the input signal is voltage-divided in both resistances 3 and 6, whereby the amplitude becomes small. When the input signal becomes small, the base potential of the transistor 12 drops less than E0, and the transistor 14 comes to a non-conductive state, whereby the input signal is outputted through the division resistance 3.

4. 发明专利

JPS53133331A PRINTING EQUIPMENT 失效
公开(公告)号：JPS53133331A
公开(公告)日：1978-11-21
申请号：JP4927177
申请日：1977-04-27
申请人： MITSUBISHI ELECTRIC CORP
发明人： HARA KEN
IPC分类号： G06F3/12 , B41J2/485 , B41J3/00 , G06K15/10
摘要： PURPOSE:To secure an easy alteration for the size of the character to be printed by performing adjustment of the frequency ratio between the pulse which control both the horizontal and vertical feeding mechanisms of a printer and the line alteration pulse which changes the line of a line selection circuit.

5. 发明专利

JPH01161216A PROJECTION TYPE DISPLAY MONITOR 失效
公开(公告)号：JPH01161216A
公开(公告)日：1989-06-23
申请号：JP32216487
申请日：1987-12-17
申请人： MITSUBISHI ELECTRIC CORP
发明人： HARA KEN , YAMAMOTO SHOHEI
IPC分类号： G02B27/14 , G02F1/1335 , H04N9/31
摘要： PURPOSE:To simplify and miniaturize the constitution of the title monitor, to reduce the cost of the monitor and to improve the performance of the monitor by arranging a reflecting member provided with two reflecting faces turned to respectively different directions so that monochromatic light beams or mixed color light beams made incident from two directions to a surface are reflected in the same direction and the reflected light goes to mixed color light. CONSTITUTION:The reflection member 9 is constituted of continuously forming many parallel projections having triangular sections with 132 deg. angles on both the vertex parts and groove bottom parts, parallel light beams projected from a light source 1 and reflected by a reflecting plate 5 are respectively made incident upon respective reflecting faces 9a on one side and reflected in the same direction, parallel light beams projected from a light source 2 and reflected by a reflecting plate 6 are respectively made incident upon respective reflecting faces 9b on the other side and reflected in the same direction and the parallel light beams of a mixed light state are projected to a reflecting plate 8. Consequently, light division and mixing can be easily executed, the whole constitution can be simplified, and since the system is a reflection system, light attenuation can be reduced and a bright video can be obtained.

6. 发明专利

JPS574619A POLARITY FIXING CIRCUIT OF PULSE SIGNAL 失效
公开(公告)号：JPS574619A
公开(公告)日：1982-01-11
申请号：JP7950980
申请日：1980-06-11
申请人： MITSUBISHI ELECTRIC CORP
发明人： HARA KEN
IPC分类号： H03K5/00 , H03K5/156 , H03K17/00
摘要： PURPOSE:To extract a pulse signal of a certain polarity regardless of the polarity of the pulse signal to be applied, by leading out the 1st or 2nd level singal in accordance with the polarity of the signal to be applied and securing an exclusive OR between the 1st or 2nd level signal and the pulse signal. CONSTITUTION:A synchronous signal input 1 to be applied to an input terminal 10 is applied to one input side of an exclusive OR circuit 20 as well as to the base of a transistor (TR) 21. The collector of the TR21 is connected to a constant power source Vcc, and the emitter is grounded via a resistance 23 and at the same time connected to the base of a switching TR28 via a clamping circuit consisting of capacitors 24 and 27, a diode 26 and others. The collector of the TR28 is connected to the other input side of the circuit 20. Then the output of the circuit 20 is extracted in the form of a synchronous signal output 9.

7. 发明专利

JPS54114159A AUTOMATIC GAIN CONTROL CIRCUIT 失效
公开(公告)号：JPS54114159A
公开(公告)日：1979-09-06
申请号：JP2240878
申请日：1978-02-27
申请人： MITSUBISHI ELECTRIC CORP
发明人： CHIBA KAZUHIRO , TACHIKI TAKEHIKO , HARA KEN
IPC分类号： H03G3/30 , H03G3/20
摘要： PURPOSE:To constitute an AGC circuit with smaller number of the resistance group and change-over switch than conventional by providing plural units of the attenuation resistance which can be switched by the switch to the input circuit as well as to the negative feedback circuit. CONSTITUTION:The 1st resistance groups r1-re and the 2nd resistance groups R1-Rm feature the relations r1>r2>...>re and R1 ... VS is defined. In case e0>VS still continues even after selection of re, r1 is connected again. And switch 4 operates after R2 is connected via 2nd switch group 7. Thus, e0

8. 发明专利

JPS63308478A SPOT ERASING CIRCUIT 失效
公开(公告)号：JPS63308478A
公开(公告)日：1988-12-15
申请号：JP14439687
申请日：1987-06-09
申请人： MITSUBISHI ELECTRIC CORP
发明人： HARA KEN
IPC分类号： H04N3/20
摘要： PURPOSE:To require no selection of a time constant, to receive no influence of stray electrostatic capacity or the like and to surely erase a spot by providing a switch part and a capacitor and applying a negative voltage to the first grid of a cathode ray tube at the time of extinguishing the driving power source of the cathode ray tube. CONSTITUTION:At the time of interrupting the heater power source 30 of the cathode ray tube 1, a heater 1H has a low resistance, so that the voltage -6.3V of the heater power source 30 is rapidly extinguished and the base voltage of a transistor 22 goes to zero and is elevated. Then, the base voltage is higher than the zener voltage Vz of a zener diode 21 to interrupt the transistor 22 and a resistance variable terminal 23c is held to the negative potential according to the capacitor 24. This negative potential is applied to the first grid 1G of the cathode ray tube 1 and the anode current of the cathode ray tube 1 is immediately cut off to prevent the generation of the spot.

9. 发明专利

JPS5717993A DISPLAY SIGNAL GENERATOR 失效
公开(公告)号：JPS5717993A
公开(公告)日：1982-01-29
申请号：JP9346380
申请日：1980-07-07
申请人： MITSUBISHI ELECTRIC CORP
发明人： HARA KEN
IPC分类号： G09G5/18 , G09G1/06

10. 发明专利

JPS558176A BAND BLOCKING FILTER 失效
公开(公告)号：JPS558176A
公开(公告)日：1980-01-21
申请号：JP8172778
申请日：1978-07-04
申请人： MITSUBISHI ELECTRIC CORP
发明人： HARA KEN
IPC分类号： H03H11/04
摘要： PURPOSE:To obtain a band blocking filter which can set the central frequency and the band width independently and features an infinite attenuation quantity by using the resistor connected in series to the input signal, the parallel-connected BPF, the voltage comparator and the variable resistance element each. CONSTITUTION:One of input signals 31 enters resistor 32, and the other enters amplitude limiter 35 each. And then these both signals enter BPF36 in the form of the rectangular wave of a fixed amplitude. When the output amplitude of frequencies f1-f2 of BPF36 become larger than threshold level VO of voltage comparator 37, output 53 of circuit 27 features the H level at frequencies f1-f2 and the L level at other frequencies. With application of output 53 to the gate of variable resistance element 34 composed of FET, the overlap resistance value of element 34 becomes zero when output 53 features the H level and then cut off to be infinite with the L level respectively. Accordingly, for the frequency characteristics of output signal 33, the amplitude of f1-f2 is O, and the input signal is delivered directly for other frequencies. When the frequency of BPF is varied, the central frequency of the blocking band cahnges. And with variation of the threshold level of circuit 37, the blocking band width is varied.

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