-
公开(公告)号：JPS63233321A
公开(公告)日：1988-09-29
申请号：JP6440087
申请日：1987-03-20
Inventor： MIHASHI YOSHINOBU , ISHIHARA SATOSHI , TAGAWA MASAFUMI , YAMAZAKI HIROSHI
Abstract: PURPOSE:To measure the change quantity of physical quantity to be measured with high sensitivity, by changing the proper parameter of an optical fiber sensor measuring apparatus so as to make an interference luminous intensity constant. CONSTITUTION:A feedback control system consisting of a regulation part 21 and a wavelength control part 22 is added to an optical fiber sensor measuring apparatus 20 and the wavelength of the light emitted from a light source is used as a parameter performing feedback control. A coherent light source part 1 has a semiconductive laser 30 and a current control part 31 so as to always supply a constant current and the wavelength control part 22 is equipped with the temp. control mount 33 mounting the laser 30, an electronic cooler 34 cooling the mount 33 to measure temp., a temp. sensor 35 and a current driver 36 driving the electronic cooler 34 so as to set the detection temp. of the sensor 35 to the temp. ordered by the regulation part 21. The regulation part 21 inputs the interference luminous intensity output of a homodyne type light detection part 4 to change the wavelength of the laser 30 so as to make the value thereof constant and, therefore, the corresponding temp. command signal is outputted.
-
公开(公告)号：JPS63228035A
公开(公告)日：1988-09-22
申请号：JP6014787
申请日：1987-03-17
Applicant: AGENCY IND SCIENCE TECHN , SUMITA OPTICAL GLASS , TOKYO AIRCRAFT INSTR CO
Inventor： MIHASHI YOSHINOBU , ISHIHARA SATOSHI , TAGAWA MASAFUMI , HANAWA MORITOMO
Abstract: PURPOSE:To easily measure the intensity, etc., of a ray flux, etc., emitted by a ray source by providing a photodetection part and a through hole, an output part and a detection part, etc. CONSTITUTION:A monitor device 20 is set so that the center line of its through hole 14 is nearly aligned with a line which connects a semiconductor laser 7 to a vapor-deposited material 8; and its photodetection part 12 is directed to the laser 7. Further, an output part 16 is provided with photoelectric converting elements at individual optical fiber output terminals and electric signals are led out. Then particles vaporized from the vapor-deposited material 8 reach the resonator surface of the laser 7 through the through hole 14 of the device 20. In the process, the film is grown by vapor deposition to vary in film thickness, so variation of the light output of the laser 7 based on the variation is detected 21 to track and monitor the process.
-
公开(公告)号：JPH01302305A
公开(公告)日：1989-12-06
申请号：JP13404188
申请日：1988-05-31
Applicant: AGENCY IND SCIENCE TECHN , HITACHI CABLE
Inventor： MIHASHI YOSHINOBU , ISHIHARA SATOSHI , YAJIMA HIROYOSHI , UETSUKA NAOTO
Abstract: PURPOSE:To miniaturize an element by forming gratings having periodical structures, whose phases are shifted from each other by 180 deg. in the light propagation direction, on first and second cores respectively. CONSTITUTION:A grating 6 as a periodical ruggedness on a core 3 is formed besides two asymmetrical cores 2 and 3 and a grating 4. Periodical structures of the grating 4 formed on the first core 2 and the grating 6 formed on the second core 3 in the coupling part have phases shifted from each other by 180 deg. in the light propagation direction. Thus, a coupling coefficient is increased, and the length of the coupling part 5 is shortened to a half conventional length, and the element is miniaturized.
-
公开(公告)号：JPS6424206A
公开(公告)日：1989-01-26
申请号：JP18012187
申请日：1987-07-21
Applicant: AGENCY IND SCIENCE TECHN , HITACHI CABLE
Inventor： MIHASHI YOSHINOBU , ISHIHARA SATOSHI , YAJIMA HIROYOSHI , UETSUKA NAOTO
Abstract: PURPOSE:To permit the use of quartz glass for a refractive index modulation type grating by vitrifying porous glass deposited on a substrate by adding a dopant for increasing the refractive index periodically. CONSTITUTION:After forming a porous glass layer 2 on the surface of a quartz substrate 1 and impregnating the porous glass layer 2 with a resist 3 dropped thereon, the porous glass layer 2 is heated. Then, interference fringes are formed on the porous glass layer by generating interference between two fluxes of obliquely irradiated He-Ne laser light 4. Porous glass parts 5 from which uncrosslinked resists 3 are removed with a period of an order of the wavelength of the laser light 4 are prepd. by developing and drying the porous glass layer. When a dopant soln. 7 for increasing the refractive index, such as Ge(OCH3)4 + H2O + CH3OH, etc., is dropped thereon, the soln. is impregnated into the porous glass parts 5, forming porous glass parts 8 contg. GeO2. By heating the porous glass together with the substrate 1 at a specified temp. in O2 atmosphere, the porous glass parts 6 and the porous glass parts 8 contg. GeO2 are transformed to vitreous glass. Thus, a grating 9 having refractive index variable with a period of an order of the wavelength of the laser light is formed on the substrate 1.
-
公开(公告)号：JPS623217A
公开(公告)日：1987-01-09
申请号：JP14318885
申请日：1985-06-28
Applicant: AGENCY IND SCIENCE TECHN
Inventor： KIKUCHI KEISUKE , YAJIMA HIROYOSHI , MIHASHI YOSHINOBU , MUKAI SEIJI
Abstract: PURPOSE:To detect a focus position by detecting the focus position by utilizing the fact that the difference signal output of a split photodetector is inverted in phase at a focusing point where a reflector is positioned. CONSTITUTION:Divergent light from a laser 1 is converged on the reflecting surface 4 of an optical disk, etc., through a lens 3 and reflected light from the reflecting surface 4 is passed through the lens 3 again and returned to a BDLD 1 which operates as the split detector. The direction of the peak intensity of divergent light from the BDLD 1 is deflected periodically by flowing a high frequency current to divided electrodes. Divergent light 2' whose direction of the peak internsity is deflected periodically is converged on the reflecting surface 4 through the lens 3. In this case, the converged spot 2'' on the reflecting surface 4 is fixed regardless of the deflection when the reflecting surface 4 is positioned at the focusing position (b), but in phase and opposite in phase on the basis of the deflection direction when the reflecting surface 4 is at positions (a) and (c) before and behind the focusing point. Consequently, which side of the focusing point the spot is defocused to is detected from the phase of the difference signal.
-
Patent Agency Ranking
公开(公告)号：JPS61247901A
公开(公告)日：1986-11-05
申请号：JP8980885
申请日：1985-04-25
Inventor： MIHASHI YOSHINOBU , ISHIHARA SATOSHI , TAGAWA MASAFUMI , YAMAZAKI HIROSHI
Abstract: PURPOSE:To decide whether the polarity is positive or negative even when the range of a phase difference is expanded greatly by obtaining an envelope signal on which an interference signal of interference light consisting of plural known wavelength components is superposed. CONSTITUTION:The intensity of output interference light when coherent light beams which have wavelength lambda and are mutually phi out of phase is expressed as 2(1+cosphii). When this interference light output is superposed as to i=1, 2 and spectrum component of lambda1 and lambda2 are detected at the same time, the sum IT is as shown by an equation 1 and the difference is as shown by an equation 2; when phi1 and phi2 vary uniformly, the IT and ID draw what is called 'beat waveform'. Then, envelope outputs IHC and IHS of the equations 1 and 2 are as shown by an expression 3. A two-wavelength system using the equation 1 is judged within a range 0
-
公开(公告)号：JPH04333291A
公开(公告)日：1992-11-20
申请号：JP10288891
申请日：1991-05-09
Applicant: AGENCY IND SCIENCE TECHN , KAWASAKI STEEL CO
Inventor： SHIBATA HAJIME , MIHASHI YOSHINOBU , KONDO HIDEKAZU , OOTA TOMOHIRO
IPC: C30B25/02 , C30B29/04 , C30B29/40 , H01L21/205 , H01L33/10 , H01L33/14 , H01L33/20 , H01L33/34 , H01L33/40 , H01S5/00 , H01S5/32
Abstract: PURPOSE:To enable optical recording media to be mounted high in density by a method wherein a diamond single crystal is made to serve as an active layer, and a clad layer is formed of cubic boron nitride(cBN) single crystal. CONSTITUTION:A P-type cBN layer 1, a diamond layer 2, and an N-type cBN layer 3 are successively laminated on a substrate 4, and a double hetero-junction is formed by the junction of the layers 1, 2, and 3. The diamond layer 2 is functions as a light emitting region or an active layer. The cBN layers 1 and 3 are made to serve as clad layer. As the band gap of cBN is larger than that of diamond, a potential barrier induced at a junction interface between them prevents thermal diffusion from the active layer 3 to the cBN clad layers 1 and 3. Light emitted inside the diamond active layer 2 is totally reflected by the junction interface of the layer 2 with the clad layers 1 and 3, so that the diamond layer 2 is small in emission loss. By this setup, optical recording media can be mounted high in density.
-
公开(公告)号：JPH01302304A
公开(公告)日：1989-12-06
申请号：JP13404288
申请日：1988-05-31
Applicant: AGENCY IND SCIENCE TECHN , HITACHI CABLE
Inventor： MIHASHI YOSHINOBU , ISHIHARA SATOSHI , YAJIMA HIROYOSHI , UETSUKA NAOTO
Abstract: PURPOSE:To improve reliability and to miniaturize the element by forming the projecting parts of gratings to the refractive index larger than the refractive index of a core and forming a clad having the refractive index smaller than the refractive index of the core to the part above the ruggedness of the grating. CONSTITUTION:The core 2 consisting of SiO2-TiO2 glass is formed on a quartz substrate 1. The projecting parts 5 of the grating 3 consisting of Nb2O2 having the refractive index nf are formed on the core 2 consisting of the SiO2-TiO2 glass and the clad 4 consisting of SiO2 glass having the refractive index nc smaller than nf is formed thereon. The change in the element characteristics by sticking of dirt, water drops, etc., is eliminated with the flush type and the coefft. of coupling is increased in this way. The element is thus miniaturized.
-
公开(公告)号：JPH01141359A
公开(公告)日：1989-06-02
申请号：JP29955587
申请日：1987-11-27
Applicant: AGENCY IND SCIENCE TECHN , TOKYO AIRCRAFT INSTR CO
Inventor： MIHASHI YOSHINOBU , ISHIHARA SATOSHI , TSUCHIDA HIDEMI , YOSHIDA JUNICHI , NISHIDE KENICHI , KONDO TOSHIO
IPC: G01D5/30 , G01B11/00 , G01P15/08 , G01P15/093 , G01P15/13
Abstract: PURPOSE:To obtain high sensitivity by a simple constitution by reflecting an emitted light from a semiconductor laser by a specular surface formed integrally in an actuator movable part and converting it to a return light to the semiconductor laser itself. CONSTITUTION:The front output light of a semiconductor laser 6 forms a focus in the vicinity of the reflecting mirror M of an actuator movable part 1 by optical system 8, 9. When an acceleration input is applied, and the actuator movable part 1 is deflected, the quantity of a return light to the semiconductor laser 6 is varied, and the output of the semiconductor laser 6 is varied greatly by a self-coupling effect. This output of the semiconductor laser 6 is detected by a photodetector 7, and fed back to the torquer coil 2 of the actuator movable part through a servo-amplifier. By detecting this feedback current, the acceleration input can be known.
-
公开(公告)号：JPS642009A
公开(公告)日：1989-01-06
申请号：JP15852187
申请日：1987-06-25
Applicant: AGENCY IND SCIENCE TECHN , HITACHI CABLE
Inventor： YAJIMA HIROYOSHI , ISHIHARA SATOSHI , MIHASHI YOSHINOBU , UETSUKA NAOTO
Abstract: PURPOSE:To decrease a loss and to improve reliability by providing a groove part to a silicon substrate and forming a space between a light guide and optical fiber joint part, thereby stably maintaining the coupling part. CONSTITUTION:The optical fiber 3 guided by fiber guides 2, 2' and the light guide 1 are supported by the silicon substrate 1 and the groove 6 is provided to the substrate 4 near the joint part of the fiber 3 and the light guide 1. The space is formed in the joint part so that the dealing with the expansion of the adhesive agent by a change of the ambient temp. is improved; in addition, the self-aligning effect by the surface tension at the time of welding and connecting by using a laser acts satisfactorily. As a result, the coupling part is stably maintained and the loss is suppressed. The reliability is thus enhanced.
-
-
-
-
-
-
-
-
-
Search Results
22
records
(took 0.023 seconds)
