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1. 发明专利

JPH07193437A GAIN SWITCHING OPTICAL RECEIVER AMPLIFIER CIRCUIT 失效
公开(公告)号：JPH07193437A
公开(公告)日：1995-07-28
申请号：JP33300493
申请日：1993-12-27
申请人： HITACHI LTD , HAMAMATSU PHOTONICS KK
发明人： HASEGAWA ATSUSHI , YAMASHITA KIICHI , HASEGAWA YUTAKA , HAMAGISHI TAKAHIRO , KYOMASU MIKIO , SUZUKI TAKAYUKI
IPC分类号： H03F3/08 , H03G3/30 , H04B10/07 , H04B10/2507 , H04B10/293 , H04B10/40 , H04B10/50 , H04B10/564 , H04B10/572 , H04B10/60 , H04B10/69 , H04L25/03 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/26 , H04B10/28
摘要： PURPOSE:To output DC voltage at the time of a right input without light by operating as an amplifier when an incident light level is small and operating by lowering the gain and widening a light receiving dynamic range when the incidnet light level is large. CONSTITUTION:A differential amplfier 20 defines the output of a circuit by an inversion amplifier 3 and a gain switching circuit 22 as a positive input and defines the output of a reference voltage generation source circuit 24 by the inversion amplifier 10 and the gain switching circuit 23 having the same constitution as a negative input. Therefore, the amplifier 20 does not fluctuate DC voltage outputted at the time of an input without light before and after the switching of the gain of the inversion amplifiers 3 and 10. A gain switching control circuit 15 is composed of transistors 16 to 18, a current source 19 and a voltage source having set voltage V 1. When an input signal Vc 1 is higher than the set voltage V 1, the transistors 16 and 17 are turned off and current does not flow to the gain switching circuits 22 and 23 and diodes 7 and 15. As a result, a switching is performed so that the gain of the inversion amplifiers 3 and 10 may be increased.

2. 发明专利

JPH07131488A DRIVING CIRCUIT FOR LIGHT EMITTING ELEMENT 失效
公开(公告)号：JPH07131488A
公开(公告)日：1995-05-19
申请号：JP27073193
申请日：1993-10-28
申请人： HAMAMATSU PHOTONICS KK , HITACHI LTD
发明人： SUZUKI TAKAYUKI , KYOMASU MIKIO , YAMASHITA KIICHI , HASEGAWA ATSUSHI , HASEGAWA YUTAKA , HAMAGISHI TAKAHIRO
IPC分类号： H04B10/40 , H04B10/50 , H04B10/524 , H04B10/60 , H04B10/80 , H04L25/02 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/26 , H04B10/28
摘要： PURPOSE:To provide the driving circuit for light emitting elements which can drives a light emitting element at a high speed and facilitates light emission output control. CONSTITUTION:When a transistor(TR) QA1 turns off to stop supplying a current to the light emitting element D1, a TR QA3 connected to the light emitting element D1 in parallel turns on and the terminals of the light emitting element D1 is short-circuited. Therefore, when the light emitting element D1 lights out, electric charges accumulated in the parasitic capacitance of the light emitting element D1 are rapidly discharged. Further, when the TR QA1 turns on to start supplying the current to the light emitting element D1, a TR QA1 turns on at the same time and a current signal D having a peak at the time of its rise flows to the light emitting element D1. Therefore, when the light emitting element D1 illuminates, the capacitance C1 parasitic to the light emitting element D1 is speedily charged with the peak component at the time of the rise of the current signal D.

3. 发明专利

JPH07135455A PEAK LEVEL OR BOTTOM LEVEL DETECTOR 失效
公开(公告)号：JPH07135455A
公开(公告)日：1995-05-23
申请号：JP27959093
申请日：1993-11-09
申请人： HAMAMATSU PHOTONICS KK , HITACHI LTD
发明人： SUZUKI TAKAYUKI , KYOMASU MIKIO , YAMASHITA KIICHI , HASEGAWA ATSUSHI , HASEGAWA YUTAKA , HAMAGISHI TAKAHIRO
IPC分类号： H03K5/1532
摘要： PURPOSE:To obtain a peak or bottom level detector in which a peak level or a bottom level of an input signal is detected at a high speed and a detected output is kept for a long time. CONSTITUTION:A 1st peak detection circuit A detects a peak level at a high speed and the storage time of the charge stored in a capacitor CA is short. A 2nd peak detection circuit B has a somewhat slow operating speed and the storage time of the charge stored in a capacitor CB is long. The arithmetic operation circuit C takes the sum of detection outputs of the circuits A, B. Furthermore, a very small current source circuit D extracts very small currents from the capacitors CA, CB and a discharge time constant of the charge stored in the capacitors CA, CB is controlled. A peak level or a bottom level outputted from the arithmetic operation circuit C are provided as an output at a high speed by the circuit A and kept for a long time by the circuits B, D.

4. 发明专利

JPH10247757A LIGHT EMITTING MODULE FOR LIGHT COMMUNICATION 失效
公开(公告)号：JPH10247757A
公开(公告)日：1998-09-14
申请号：JP4879997
申请日：1997-03-04
申请人： NIPPON TELEGRAPH & TELEPHONE , HAMAMATSU PHOTONICS KK
发明人： ICHINO HARUHIKO , HIROSE MASAKI , WARASHINA SADAHISA , KYOMASU MIKIO
IPC分类号： G02B6/42 , H01L31/0232 , H01S3/04 , H01S5/00 , H01S5/024 , H01S5/026 , H01S3/18 , H01S3/043
摘要： PROBLEM TO BE SOLVED: To realize a light communication light emitting module which is excellent in heat dissipating properties and capable of operating on a G bit/s band at an ultra-high speed by a method wherein an LD driver IC is mounted direct on a heat sink through the intermediary of no board, and an LD and the LD driver IC are directly connected together with a bonding wire. SOLUTION: An LD 1 is mounted on a sub-mount 2 together with a sub- carrier 6 mounted with a PD 5 and a temperature detecting thermistor 8, and the sub-mount 2 is arranged on a Peltier device 3. On the other hand, an LD driver IC 4 is mounted direct on a heat sink 10. A board 9 is partly cut out so as not to impede the mounting of the LD driver IC 4 and mounted on the heat sink 10. Electrical signals are inputted into the LD driver IC 4 through a wiring pattern 7 on the board 9 and a bonding wire 12 between the board 9 and the LD driver IC 4. Drive signals are transmitted direct from the LD driver IC 4 to the LD 1 through the bonding wire 12.

5. 发明专利

JPH08234059A OPTICAL MODULE DEVICE 失效
公开(公告)号：JPH08234059A
公开(公告)日：1996-09-13
申请号：JP3687395
申请日：1995-02-24
申请人： HAMAMATSU PHOTONICS KK
发明人： WARASHINA SADAHISA , KYOMASU MIKIO
IPC分类号： G02B6/42 , H01L31/02 , H01L33/58 , H01L33/00
摘要： PURPOSE: To provide an optical module device which is suitable for mass production and with which exact axis alignment is possible. CONSTITUTION: A resin molding type case 11 is formed of a resin. The circumference at the end of a base plate 14a of a light emitting and receiving element 14 is adhered to the case 11 by a photosetting resin 16. The bottom of the base plate 14a projected with lead pins 16b is closed by a gelatinous resin 18. Further, a thermosetting resin 19 is laminated on the gelatinous resin 18. The shrinkage strain generated in the thermosetting resin 19 is absorbed in the gelatinous resin 18 and the mounting position of the light emitting and receiving element 14 does not change in spite of the occurrence of such shrinkage strain.

6. 发明专利

JPH0815577A RESIN MOLDED RECEPTACLE AND ITS PRODUCTION 失效
公开(公告)号：JPH0815577A
公开(公告)日：1996-01-19
申请号：JP14983594
申请日：1994-06-30
申请人： HAMAMATSU PHOTONICS KK , KYOCERA CORP
发明人： KYOMASU MIKIO , IKETANI TAKESHI , YASUDA TOSHIMICHI , IKEGAMI SHIN , YAMAGISHI TAKASHI
IPC分类号： G02B6/42
摘要： PURPOSE:To provide a resin molded receptacle which is formed by using a resin, aligns the optical axis of light from an optical semiconductor element and the optical axis of a fiber and prevents fluctuating of a ferrule inserted into a sleeve in an axial direction of this sleeve and a process for producing the same. CONSTITUTION:This resin molded receptacle has the sleeve 30 and a selfoc lens 40 in a case 10 integrally molded of a resin type material. The receptacle has a laser diode 50 in the case 10. An SC connector holding part 20 composed of 20a to 20e is fixed to the outside wall of the case 10. A pinhole member 60 which is formed to an approximate disk shape (toric shape) and is bored with a through-hole penetrating the central axis thereof is installed in the sleeve 30.

7. 发明专利

JPH0811142A COMPOSITE MOLD FOR MOLDING RESIN 失效
公开(公告)号：JPH0811142A
公开(公告)日：1996-01-16
申请号：JP14984494
申请日：1994-06-30
申请人： HAMAMATSU PHOTONICS KK , KYOCERA CORP
发明人： KYOMASU MIKIO , IKETANI TAKESHI , YASUDA TOSHIMICHI , IKEGAMI SHIN , YAMAGISHI TAKASHI
IPC分类号： G02B6/38 , B29C39/02 , B29C39/26 , B29L11/00 , B29L31/36 , G02B6/42
摘要： PURPOSE:To provide a composite mold for molding a resin to produce a resin molded receptacle while enabling the optical axis of the light from an optical semiconductor element to coincide with that of a fiber. CONSTITUTION:A lower mold 310 has an almost rectangular parallelepiped shape and has a plurality of recessed and protruding parts on the upper surface thereof. At first, a square hole 310p having a square plate shape is provided to the central part of the upper surface of the mold and a cylindrical hole 310q is provided centering around the center axis of the square hole 310p. A first column part 310b is formed by providing the cylindrical hole 310q and a second column part 310z having a diameter smaller than that of the first column part 310b is integrally molded on the first column part 310b using the axis of the first column part 310b as a common axis. The second column part 310z has a truncated coneshape structure wherein the diameter of the leading end thereof is smaller than that of the connection part with the first column part 310b being the lower end thereof.

8. 发明专利

JPH07336196A OSCILLATION CIRCUIT 失效
公开(公告)号：JPH07336196A
公开(公告)日：1995-12-22
申请号：JP12516594
申请日：1994-06-07
申请人： HAMAMATSU PHOTONICS KK
发明人： OKAJIMA KENICHI , KYOMASU MIKIO
IPC分类号： H03K3/0231 , H03K4/50
摘要： PURPOSE:To obtain the oscillation output of a large duty rate by intermittently controlling a charging current to a second capacitor by means of a first switch corresponding to the oscillation output of a first relaxation oscillator so as to reduce the average charging current and increase charging time to the second capacitor. CONSTITUTION:In a state where the electric charge of the capacitor C2 is discharged, the voltage of the reverse input of a second differential amplifier 123 is lower than that of not-reverse input so that the output of the amplifier 123 comes into a state L. The charging current from a constant current source circuit QP10 is integrated by the capacitor C2 when the output of the relaxation oscillator 110 is L, but FETM 1 is in an off state at the time of the output of the relaxation oscillator 110 is H so that the electric charge collected at the capacitor C2 is kept being held so as to make the integrated voltage of C2 constant. Consequently, the charging current from the circuit 11 is made to flow intermittently by the output of the oscillator 110 so that the integrated voltage C2, namely the voltage of the not-reverse input of the second amplifier 123, is boosted gradually. The duty rate of the relaxation oscillator 120 is made 1:1000 to 2000 like this.

9. 发明专利

JPH05291614A 失效
公开(公告)号：JPH05291614A
公开(公告)日：1993-11-05
申请号：JP8376992
申请日：1992-04-06
申请人： HAMAMATSU PHOTONICS KK
发明人： KYOMASU MIKIO
IPC分类号： H01L31/16
摘要： PURPOSE:To obtain a title device which outputs only a photocurrent corresponding to the light energy of an incident light spot by connecting a bypass resistance formed of a nondoped silicon layer to every microimpurity layer. CONSTITUTION:A photocurrent generated by light incidence into a photodiode Da (i) is fetched according to frequency characteristics having a cut-off frequency determined by a bias resistance R (i) corresponding to this photodiode Da (i) and a coupling capacitance. Hereupon, when the resistance value of the bias resistance R (i) is small, the coupling capacitance is a very small capacitance value, so that resistance cut-off frequency is very high. However, since the bias resistance is formed of a polysilicon layer, a high resistance can be realized; therefore, even when the coupling capacitance is a very small capacitance value, frequency characteristics having a reduction cut-off frequency optimum to fetch a photocurrent can be set, resulting in an improvement in the precision of photocurrent sensing.

10. 发明专利

JPH0531953B2 失效
公开(公告)号：JPH0531953B2
公开(公告)日：1993-05-13
申请号：JP17676287
申请日：1987-07-15
申请人： HAMAMATSU PHOTONICS KK
发明人： TERADA YOSHITAKA , KYOMASU MIKIO
IPC分类号： G01V8/12

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