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41. 发明专利

JPH0457587A SIGNAL TRANSMITTER 失效
公开(公告)号：JPH0457587A
公开(公告)日：1992-02-25
申请号：JP16910090
申请日：1990-06-27
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： OKAMURA NOBORU , MORIKURA SUSUMU , FUJITO KATSUYUKI
IPC分类号： H04N19/00 , H04J3/00 , H04N7/20 , H04N11/04 , H04N19/70
摘要： PURPOSE:To transmit an audio signal by using a signal whose frequency is equal to that of a vertical synchronizing signal or a horizontal synchronizing signal of a component video signal as a luminance signal of the component video signal when no component video signal exists. CONSTITUTION:A signal detector 100 detects the presence of a luminance Y signal and when the luminance Y signal exists, a high level Hi is outputted and when no luminance Y signal exists, a low level Lo is outputted, a Y signal 200 is outputted from a switch 101 when an output 201 of a monostable multivibrator is at a high level Hi and a signal 201 inputted from a signal generator 102 is outputted from the switch 101 when the output 201 of the monostable multivibrator is at a low level Lo. A pulse frequency width (PFWM) modulator applies pulse frequency (PFM) modulation to the Y signal included in the output of the switch 101 and applies pulse width modulation to the obtained signal alternately by using color difference signals PR, PB. Moreover, a digital audio signal subjected to time axis compression and an identification signal representing the position are used to apply PFM binary pulse width modulation for part of a horizontal blanking period or vertical blanking period. Thus, even when no Y signal 200 exists, since the reference signal exists, the transmission of the audio signal is attained.

42. 发明专利

JPH03114324A COHERENT LIGHT TRANSMITTER 失效
公开(公告)号：JPH03114324A
公开(公告)日：1991-05-15
申请号：JP25331189
申请日：1989-09-28
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： YAMAMOTO HIROAKI , FUJITO KATSUYUKI
IPC分类号： H04B10/61 , H04B10/07 , H04B10/2507 , H04B10/516 , H04B10/54 , H04B10/548 , H04B10/564 , H04J1/00
摘要： PURPOSE:To trace the frequency of a light of a local oscillation semiconductor laser with the frequency of an optical signal from a transmitter and to obtain an original signal stably by transmitting a carrier signal even in the absence of the original signal. CONSTITUTION:A transmitter 100 multiplexes a carrier signal 400 onto an original signal 300, applies amplitude modulation to the original signal 300 by using the carrier signal 400 and the resulting signal is fed to the drive current of a semiconductor laser 1 to apply frequency modulation to the frequency of the light of the semiconductor laser 1. A receiver 200 detects a beat signal between the sent optical signal and the optical signal from a local oscillation semiconductor laser 2, a frequency discrimination circuit 30 with the S-shaped characteristic applies frequency discrimination to the beat signal, extracts a carrier signal component to control the frequency of the light of the local oscillation semiconductor laser 2 so as to maximize the amplitude of the carrier signal. Thus, the frequency of the light of the local oscillation semiconductor laser 2 traces with the frequency of the optical signal from the transmitter 100 and the original signal is stably obtained.

43. 发明专利

JPH0329211B2 失效
公开(公告)号：JPH0329211B2
公开(公告)日：1991-04-23
申请号：JP23810483
申请日：1983-12-16
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： FUJITO KATSUYUKI
IPC分类号： H04B10/2507 , H04B10/00 , H04B10/07 , H04B10/25 , H04B10/54 , H04B10/564 , H04J14/00 , H04J14/02

44. 发明专利

JPH01288140A OPTICAL LINK FOR HIGH SPEED DATA TRANSMISSION 失效
公开(公告)号：JPH01288140A
公开(公告)日：1989-11-20
申请号：JP11850388
申请日：1988-05-16
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： FUJITO KATSUYUKI
IPC分类号： H04L25/38 , H04L7/04 , H04L13/00 , H04L13/10 , H04L29/02
摘要： PURPOSE:To eliminate the need for any special consideration synchronizing a clock of a transmission system and an output data of a computer by applying parallel/serial conversion to multiplexed 1, 0 bits alternately in a rate being the result of dividing a transmission rate of a transmission system by a parallel data number. CONSTITUTION:An output of a clock signal oscillator 4 deciding the transmission rate of an optical transmission system becomes a clock of a P/S converter 2, counted down by a counter 5 of N-count and inputted to a T-FF6. The output of the T-FF6 is inputted to the P/S converter 2 as bits A1 being alternate outputs of bits 1, 0 in a rate being the result of the transmission rate of the transmission system by a parallel data number together with a parallel data 1. Since the alternate patterns of 1, 0 are sent independently of the presence of the output signal from the computer, the continuity of the clock of the receiver is always maintained.

45. 发明专利

JPH01273444A MULTI-CHANNEL SIGNAL OPTICAL TRANSMISSION EQUIPMENT 失效
公开(公告)号：JPH01273444A
公开(公告)日：1989-11-01
申请号：JP10303288
申请日：1988-04-26
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： FUJITO KATSUYUKI , ICHIDA TAKESHIGE
IPC分类号： H04J14/00 , H04J14/02
摘要： PURPOSE:To send a signal from lots of points through a fiber with high quality by multiplexing output lights of plural semiconductor lasers (LDs) subject to brightness modulation and sending the result. CONSTITUTION:An information signal 4 is subject to FM modulation by an FM modulator 5 in an optical signal transmitter E, an FM modulation signal is added with a current from a bias current generator 6 and fed to the LD 7 and the brightness modulation of the LD is applied. The output of LD is coupled with a bit tail fiber 8 and the signal through the fiber 8 is led to a transmission fiber 1 through a multiplexer 9. N sets of optical signal transmitters E1 to En exist at each monitor point (n points), the output light is collected in the transmission fiber 1 through N-1 sets of optical multiplexers C1 to Cn-1 and sent to a monitor center 2. Thus, signals from lots of points are collected into one fiber and sent with high quality.

46. 发明专利

JPH01133385A OPTICAL OUTPUT CONTROL CIRCUIT 失效
公开(公告)号：JPH01133385A
公开(公告)日：1989-05-25
申请号：JP29230887
申请日：1987-11-19
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： YAMAMOTO HIROAKI , FUJITO KATSUYUKI
IPC分类号： G05D25/00 , H01S5/068 , H01S5/0683
摘要： PURPOSE:To hold the intensity of the output light of a semiconductor laser constant independent of the intensity of an external light by receiving the output light from the laser, inputting the corresponding signal to a gate controlled by a digital signal from a semiconductor laser driving circuit as a control signal, and feeding back the result to the bias circuit of the laser. CONSTITUTION:Assume that an optical signal input from a semiconductor laser 4 to an optical fiber 9 is reflected at the section of an optical connector or the like, again returned to the laser 4, and is incident to a photodetector 8. Further, assume that the returning light is incident when the laser 4 does not irradiate a light. In this case, when an output waveform signal from the photodetector 8 is input to a gate 7, the output signal component directly from the laser 4 is passed by a gate control signal from a semiconductor laser driving circuit 2, but the signal component due to the returning light is interrupted since the gate control signal is OFF, and the signal component due to the returning light is removed from the output waveform of the gate 7. Accordingly, the signal component due to the returning light does not affect the influence to a bias circuit 1.

47. 发明专利

JPS6379029A LIGHT TRANSMISSION NOISE MEASURING APPARATUS 失效
公开(公告)号：JPS6379029A
公开(公告)日：1988-04-09
申请号：JP22447486
申请日：1986-09-22
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： FUJITO KATSUYUKI , NISHINO YOSHIKI
IPC分类号： H04B10/00 , G01M11/00 , H04B10/07
摘要： PURPOSE:To enable highly accurate measurement of a noise or the like of an LD module with a better reproducibility, by measuring a noise of a fiber output varying the temperature if the LD module at a fixed speed with heat balance kept in a fixed temperature range. CONSTITUTION:A skewly ground connector 2 is spliced on an output fiber 3 of an LD module 1. A light output of the connector 2 is made incident into a light receiving element 5 using a lens optical system 4 so set that no reflected light is returned to the module 1. An automatic phase control section (APC) 6 keeps an output power of the module 1 constant and an LD biased current of an output of the APC 6 is added to a power source from a signal source 7 to be applied to the module 1. A heat sink 8 for temperature control mounted on the module 1 changes the temperature of the module 1 slowly at an equilibrium state with a light output in the module 1 kept constant in cooperation with a temperature control circuit 11. Thus, a noise of an output of the element 5 is measured with a spectrum analyzer 15.

48. 发明专利

JPS638607A OUTDOOR TYPE OPTICAL TRANSMISSION DEVICE 失效
公开(公告)号：JPS638607A
公开(公告)日：1988-01-14
申请号：JP15249486
申请日：1986-06-27
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NISHINO YOSHIKI , FUJITO KATSUYUKI
IPC分类号： G02B6/00 , H04B10/00 , H04B10/291
摘要： PURPOSE:To prevent moisture and dust from infiltrating the inside of an optical connector, and to make the titled device stable and satisfactory, even if it is installed in the open air, by providing a connector provided with an insertion port being capable of leading in an optical cable, an anchor part and a first waterproof part, and a body case having a second waterproof part and a connecting port of the optical fiber. CONSTITUTION:An optical cable 202 is led into the inside of a connector 204 from an insertion port 203, and the optical cable 202 is fixed to the connector 204 by making a tensile strength body 205 in the optical cable 202 pass through an anchor port 207 of an anchor tool 206 and tightening an anchor screw. Also, when a first 'O'-ring 210 is clamped by a clamping tool 209, a gap between the optical cable 202 and the insertion port 203 can be closed up by the first 'O'-ring 210. Moreover, when the connector 204 is attached to a body case 200 by a connecting screw 215, a gap between the body case 200 and the connector 204 is closed up by a second 'O'-ring. The body case 200, the connector, and the optical cable 202 are closed up tightly, therefore, they can be waterproofed.

49. 发明专利

JPS62144210A TEMPERATURE CONTROLLER 失效
公开(公告)号：JPS62144210A
公开(公告)日：1987-06-27
申请号：JP28611685
申请日：1985-12-19
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： FUJITO KATSUYUKI , NISHINO YOSHIKI
IPC分类号： G05D23/20 , G05B11/36 , G05D23/24
摘要： PURPOSE:To attain the stabilized control of temperatures by varying the gain of an amplifier circuit which amplifies the difference between the output of a temperature detecting element and the reference value in accordance with the difference of temperature between both ends of a Peltier element. CONSTITUTION:A single end of a Peltier element 1 forming a temperature controller is thermally connected to a controlled system 4 enclosed by a heat insulating part 5 via a heat sink 2. While the other end of the element 1 is thermally connected to heat dissipating part 3. The temperature of the end at one side of the element 1 is detected by the 1st temperature detecting ele ment 6 and the temperature of the other end of the element 1 is detected by the 2nd temperature detecting element 7, respectively. These detected tempera ture detecting parts 8 and 9. Here the outputs of both parts 8 and 9 undergo subtraction through a subtractor circuit 10. Then the gain of a variable gain amplifier 12 is decided in response to said output undergone the subtraction. Thus the gain of the amplifier 12 is increased when the output value of the circuit 10 is positive and increased. As a result, a large amount of current flows to the element 1 for absorption of heat as the temperature of the open air rises up.

50. 发明专利

JPS6276936A OUTDOOR INSTALLATION TYPE OPTICAL TRANSMISSION EQUIPMENT 失效
公开(公告)号：JPS6276936A
公开(公告)日：1987-04-09
申请号：JP21704485
申请日：1985-09-30
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NISHINO YOSHIKI , FUJITO KATSUYUKI , ICHIDA TAKESHIGE
IPC分类号： H04B10/00 , H04B1/036 , H04B10/07
摘要： PURPOSE:To attain optical transmission, especially, digital optical transmission by providing an outer case having a vent on the surface to cover a main body case thereby decreasing the temperature rise of the main body case and assembling an LD (semiconductor laser) in it. CONSTITUTION:An outer case 202 is provided to cover the main body case 201. The surface of the outer case 202 has a notch and is bent to have an angle on the surface and a vent 203 is given. The outer case 202 prevents solar rays 20 from being directly incident on the main case 201 and sufficient wind 21 is given to the main body case 201 through the vent 203 of the outer case 202, then the temperature rise of the main body case 201 is prevented. Thus, even when the equipment of the this invention is installed outdoor, the temperature rise of the main body case 201 is small and kept within the operating temperature range (maximum temperature 50 deg.) of the LD 200. In selecting the color of the surface of the outer case 202 as, e.g., white color, the solar ray 20 is reflected more effectively and in selecting the color of the surface of the main body case 201 as, e.g., black color, since the heat dissipation effect is increased and the temperature rise of the main body case 205 is prevented by the increase.

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