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1. 发明专利

JP2003110154A ELECTRONIC DEVICE WITH PELTIER MODULE, OPTICAL MODULE AND MANUFACTURING METHOD FOR THEM 审中-公开
公开(公告)号：JP2003110154A
公开(公告)日：2003-04-11
申请号：JP2001298913
申请日：2001-09-28
申请人： HITACHI LTD
发明人： HATA SHOHEI , KAWAMOTO KAZUTAMI
IPC分类号： B23K35/26 , C22C13/00 , H01L23/38 , H01L35/08 , H01L35/16 , H01L35/32 , H01L35/34 , H01S5/024
摘要： PROBLEM TO BE SOLVED: To improve the heat resistance of an electronic device (especially an optical transmission module) on which a Peltier module is mounted in a lead-free way. SOLUTION: With respect to a method for manufacturing an electronic device on which a Peltier module is soldered, the Peltier module which has a junction between a land on a ceramic substrate and a Peltier element joined by solder of composition range of Au-11-37 mass% Sn is used. Lead-free solder of Sn to which Ag or Zn is added is used for mounting.

2. 发明专利

JP2003092312A ELECTRONIC DEVICE AND OPTICAL TRANSMISSION MODULE 审中-公开
公开(公告)号：JP2003092312A
公开(公告)日：2003-03-28
申请号：JP2002002931
申请日：2002-01-10
申请人： HITACHI LTD
发明人： ASADA TOYOKI , FUJITA YUJI , TOGAWA HIDEO , KAWAMOTO KAZUTAMI , MATSUMOTO KUNIO , HAMAGISHI SHINYA , MATSUYOSHI MARI
IPC分类号： H01L23/29 , H01L21/60 , H01L23/31
摘要： PROBLEM TO BE SOLVED: To enhance durability of an electronic device by enhancing durability against the heat cycle. SOLUTION: In an electronic device in which a BGA (ball grid array) package is mounted on a circuit board with a flip-chip method using solder, a first resin is arranged between the circuit board and the BGA package, while a second resin is arranged around the outer periphery or at the peripheral sides of the BGA package, wherein elastic modulus of the second resin is smaller than that of the first resin, and is 0.5 GPa or larger and 28 GPa or smaller.

3. 发明专利

JP2001305369A METHOD FOR MANUFACTURING OPTICAL WAVEGUIDE TYPE GRATING 失效
公开(公告)号：JP2001305369A
公开(公告)日：2001-10-31
申请号：JP2000128949
申请日：2000-04-25
申请人： HITACHI LTD
发明人： MATSUSHIMA NAOKI , KAWAMOTO KAZUTAMI , TOGAWA HIDEO
IPC分类号： G02B6/13 , G02B6/122
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical waveguide type grating wherein choices of members composing the optical waveguide type grating are widened, a manufacturing time is reduced and excellent optical waveguide characteristics are obtained. SOLUTION: A resist pattern 13 is formed, a first core 14 is formed in at least a part of a place where the resist 13 does not exist, and a second core 15 is formed in at least a part of the place where the resist 13 has existed after removing the resist 13.

4. 发明专利

JPH11150279A SEMICONDUCTOR PHOTODETECTOR AND OPTICAL MODULE AND OPTICAL TRANSMITTER USING THE SAME 失效
公开(公告)号：JPH11150279A
公开(公告)日：1999-06-02
申请号：JP23981198
申请日：1998-08-26
申请人： HITACHI LTD
发明人： MOGI TOSHIYUKI , KAWAMOTO KAZUTAMI , TSUJI SHINJI , NAKAMURA HITOSHI , SHISHIKURA MASATO , KIKUCHI SATORU
IPC分类号： G02B6/42 , H01L31/02
摘要： PROBLEM TO BE SOLVED: To provide a semiconductor photodetector which has high compatibility with another and incidence type optical device, and can be positioned easily with high accuracy so as to reduce the cost of optical modules and optical transmitters. SOLUTION: In an end surface incidence type photodetector, in which a light-absorbing layer 19 which absorbs the detected light of the photodetector is formed, a marker detecting region 24 which has an area of at least 100 μm and transmits >=30% of the detected light which is passed and transmitted through the principal plane of the photodetector is formed in parallel with the principal plane, by forming a spatial region by removing a part of the light-absorbing layer 19. Therefore, the photodetector can easily detect a marker 23, formed on an optical device 26 and can be positioned with high accuracy.

5. 发明专利

JPH1031121A WAVEGUIDE TYPE COMPOSING/BRANCHING FILTER USING GRATING 失效
公开(公告)号：JPH1031121A
公开(公告)日：1998-02-03
申请号：JP18612896
申请日：1996-07-16
申请人： HITACHI LTD
发明人： KAWAMOTO KAZUTAMI
IPC分类号： G02B6/122 , G02B6/12
摘要： PROBLEM TO BE SOLVED: To provide a composing/branching filter in configuration, which can deal with the wavelength fluctuation of light to be transmitted and further gets suitable for mass production, concerning the composing/branching filter utilizing Bragg reflection. SOLUTION: This composing/branching filter has a three-dimensional optical waveguide 21 for enclosing light in breadthwise direction and thicknesswise direction and propagating light orthogonally to these directions and gratings 4 and 24 provided on the optical waveguide 21 along the propagating direction of light in order to reflect light 6 of specified wavelength in light 5 propagated through the optical waveguide 21. At such a time, since the optical waveguide 21 at the section provided with the gratings 4 and 24 is equipped with a section to continuously change either the width or the thickness of the optical waveguide 21 along the propagating direction of light at least so that the wavelength of reflectable light can be made into wide band.

6. 发明专利

JPH07334888A MAGNETO-OPTICAL DISK DEVICE 失效
公开(公告)号：JPH07334888A
公开(公告)日：1995-12-22
申请号：JP12236694
申请日：1994-06-03
申请人： HITACHI LTD
发明人： SAITO ATSUSHI , SUKETA YASUSHI , NAKAMURA SHIGERU , KAWAMOTO KAZUTAMI , MUNEYOSHI YASUHIKO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To make a magneto-optical disk device thinner by providing a tapered part in the direction in which an optical head is moved by an access mechanism. CONSTITUTION:On a magnetic head 102, a tapered part 108 is provided in the direction in which the optical head 104 is moved by the access mechanism 106, so that the magnetic head 102 is made easy to ride across an edge at the end part of a case 90 of an optical disk cartridge 70. Further, the magnetic head 102 is freely movable in the vertical direction, and a tension coil spring 110 of an elastic member is mounted on the optical head 104 so that the magnetic field is impressed from the position adjacent to the magneto-optical disk 80 without coming into contact therewith. During the loading operation or injecting operation, the magnetic head 102 is retreated to the position where the magnetic had 102 is not in contact with the case 90 of the optical disk cartridge 70, by the access mechanism 106. By this procedure, the magnetic head and the magneto-optical disk are arranged more closely to each other than in the conventional practice and the magnetic field is effectively impressed, therefore, the thin magnetic head is applicable, than the device is made to be thinner.

7. 发明专利

JPH07168224A FORMATION OF POLARIZATION INVERSION GRATING AND OPTICAL WAVEGUIDE AND SECOND HARMONIC WAVE GENERATING ELEMENT 失效
公开(公告)号：JPH07168224A
公开(公告)日：1995-07-04
申请号：JP31300893
申请日：1993-12-14
申请人： HITACHI METALS LTD , HITACHI LTD
发明人： MAKIO SATOSHI , SATO MASAZUMI , KAEDE HIROSHI , KAWAMOTO KAZUTAMI , ITOU AKITOMO
IPC分类号： G02F1/37
摘要： PURPOSE:To realize polarization inversion gratings having an ideal rectangular shape by impressing an electric field by a DC high voltage between electrodes facing each other on the front surface and rear surface of a substrate. CONSTITUTION:The electric field is impressed between a metallic mask electrode 52 periodically patterned at a distance L with segments bored with rectangular holes of a width W and length (d) on the front surface of the +C surface which is a direction 16 of the spontaneous polarization of an LiNbO3 substrate 11 and the electrode 53 formed with a metallic film over the entire surface of the -C face in such a manner that a positive potential is attained on the positive side of the spontaneous polarization and a negative potential on the negative side between the electrodes 52 and 53. As a result, the directions of the spontaneous polarization cause polarization inversion 12 in all of the thickness direction of the substrate in opposite directions in the certain parts of the patterns of the electrode 52. The high voltage is applied in the state of immersing the entire part of the substrate in a high vacuum or an insulating liquid in order to control discharge. Further, the parts of the segment type of the patterned electrode 52 on the front surface side are subjected to a proton exchange to form optical waveguides.

8. 发明专利

JPH05196813A DIFFRACTION GRATING TYPE OPTICAL POLARIZING ELEMENT 失效
公开(公告)号：JPH05196813A
公开(公告)日：1993-08-06
申请号：JP820592
申请日：1992-01-21
申请人： HITACHI LTD
发明人： HIYOSHI YASUO , SATO HIDEMI , FUKUSHIMA TAKAKO , KAWAMOTO KAZUTAMI , ITOU AKITOMO
IPC分类号： G02B5/18 , G02B5/30
摘要： PURPOSE:To obtain the thin diffraction grating type optical polarizing element by forming diffraction grating and ion exchange regions on a lithium niobate crystalline plate. CONSTITUTION:Grooves 3 of a prescribed depth having an interval are formed on the main surface of the lithium niobate crystalline substrate 1 and the ion exchange regions 2 are formed perpendicularly to the depth direction of the grooves 3 only in the parts formed with these grooves to offset the phase change of the extraordinary ray component received between the regions subjected to the ion exchange and the regions not subjected to the ion exchange. As a result, the thin and small-sized optical polarizing element is obtd. Further, the element can be processed by a semiconductor process technique using the lithium niobate crystalline substrate 1 and, therefore, the inexpensive supply of the elements having the stable quality is possible. The head is miniaturized by applying such element to an optical head for optical disks.

9. 发明专利

JPH03287141A WAVEGUIDE TYPE WAVELENGTH CONVERTING ELEMENT 失效
公开(公告)号：JPH03287141A
公开(公告)日：1991-12-17
申请号：JP18145290
申请日：1990-07-11
申请人： HITACHI LTD
发明人： ITOU AKITOMO , ISADA NAOYA , KAWAMOTO KAZUTAMI , HIYOSHI YASUO , SATO HIDEMI , FUKUSHIMA TAKAKO
IPC分类号： G02B6/12 , G02F1/35 , G02F1/355 , G02F1/37 , G02F1/377
摘要： PURPOSE:To obtain the waveguide type wavelength converting element which facilitates phase matching and has high efficiency by constituting this element in such a manner that the refractive index of its optical waveguide layer is uniform and the spontaneous polarizations of a substrate and the optical waveguide layer invert periodically. CONSTITUTION:This converting element consists of the substrate 14 having the spontaneous polarization and the optical waveguide layer 16 having the refractive index high than the refractive index of the substrate 14. The refractive index of this optical waveguide 16 is uniform and the spontaneous polarizations 15, 17 of the substrate 14 and the optical waveguide layer 16 invert periodically. The element has preferably the periodic polarization inversion structures formed by executing an ion exchange of Li and H followed by heating at the Curie point or below and the optical waveguide layer 16 produced by the ion exchange of the Li and H on the lithium tantalate (LiTaO3) substrate 14. Second harmonic waves 19 which can be easily condensed and are small in wave front aberration are generated with high efficiency in this way.

10. 发明专利

JPH03149506A OPTICAL WAVEGUIDE AND PRODUCTION THEREOF AND OPTICAL DEFLECTOR USING THIS WAVEGUIDE, OPTICAL INTEGRATED HEAD AND OPTICAL INFORMATION RECORDING /REPRODUCING DEVICE 失效
公开(公告)号：JPH03149506A
公开(公告)日：1991-06-26
申请号：JP28782289
申请日：1989-11-07
申请人： HITACHI LTD
发明人： ITOU AKITOMO , HIYOSHI YASUO , SATO HIDEMI , KAWAMOTO KAZUTAMI , FUKUSHIMA TAKAKO
IPC分类号： G02B6/12 , G02B6/13 , G02F1/335 , G11B7/135 , G11B7/22 , G11B7/24
摘要： PURPOSE:To increase the threshold value of an optical damage and to allow the efficient execution of light deflection by a surface acoustic wave, etc., by providing a single crystal substrate consisting of LiNb1-yTayO3 and a modified layer Li1-xHxNb1-yTayO3 in which a part of lithium ion Li is formed by an ion exchange with proton H as the optical waveguide. CONSTITUTION:The properties of the optical waveguide depend largely on the substitution rate x of Li and H . The threshold value of the optical damage increase with an increase in the substitution rate (x) as shown by curves 1, 2. The optical damage is extremely higher at all (x) with the optical waveguide subjected to the proton exchange as shown by the curve 1 than the optical waveguide subjected to the proton exchange after the thermal diffusion of Ti of the curve 2. The electrooptical constant depends mush more nonlinearly on the (x) than the threshold value of the optical damage as shown by the curve 3. The threshold value of the waveguide is increased and the electrooptical constant characteristic is enhanced in this way if the substitution rate (x) is so determined as to attain a 0.4

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