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1. 发明专利

JPH0452579A METHOD AND DEVICE FOR VIBRATION TEST OF ELECTRONIC PARTS 失效
公开(公告)号：JPH0452579A
公开(公告)日：1992-02-20
申请号：JP16309990
申请日：1990-06-21
申请人： HITACHI LTD , HITACHI COMPUTER ELECTRONIC
发明人： KONO NAOFUMI , SAGA KOJI , SATO TOSHIO , OKAMURA FUMIO , HIOKI KANJI , FUJIE TOSHIAKI
IPC分类号： G01R31/30
摘要： PURPOSE:To achieve a vibration test where frequency is changed arbitrarily in a wide frequency range by placing it within a DC magnetic field and allowing AC current to flow through it for causing an inner wiring to be vibrated. CONSTITUTION:Output of an AC power supply 13 is amplified and adjusted based on confirmation of an ammeter 15 for enabling an arbitrary AC current to flow through a fuse 12. Then, this fuse 12 is placed within DC magnetic field due to a magnet 17, thus enabling an inner wiring 12a of the fuse 12 to be vibrated by electromagnetic force. By changing magnetic flux density or current of a magnetic field for the inner wiring 12a, an arbitrary acceleration can be applied to. In this case, there is basically no limitation in frequency, thus enabling vibration of a wide range of frequency to be applied to.

2. 发明专利

JPH02303356A SWITCHING REGULATOR 失效
公开(公告)号：JPH02303356A
公开(公告)日：1990-12-17
申请号：JP12347589
申请日：1989-05-17
申请人： HITACHI LTD , HITACHI COMPUTER ELECTRONIC
发明人： KAGAYA ISAMU , YAGINUMA TAKAO , ONDA KENICHI , MIZUTA KOICHI , KONO NAOFUMI
IPC分类号： H02M3/28 , H02M3/335
摘要： PURPOSE:To reduce power loss at the time of switching by so setting capacity that stored charge amount at the time of start of discharging of a capacitor for supplying power from a DC power source to a transformer becomes substantially equivalent to charge amount to be supplied to the transformer from ON to OFF of one set of switching elements. CONSTITUTION:Power is supplied to a load side via capacitors 2, 3. In this case, the amounts of charges stored in the capacitors 2, 3 are so set in the capacity of the capacitors 2, 3 as to correspond to the power to be supplied to a load from ON to OFF of one set of switching elements 4. As a result, the charges of the capacitors 2, 3 are almost all discharged at the time of turning OFF the elements 4. Accordingly, even if the elements 4 are turned OFF, since the current is not almost fed or no current is fed at all at that time, generation of electromotive force based on it is suppressed.

3. 发明专利

JPH03105975A SEMICONDUCTOR RECTIFIER DIODE; POWER-SUPPLY APPARATUS AND COMPUTER USING IT 失效
公开(公告)号：JPH03105975A
公开(公告)日：1991-05-02
申请号：JP24203589
申请日：1989-09-20
申请人： HITACHI LTD
发明人： KOSAKA HIROSHI , MURAKAMI SUSUMU , TAKADA MASANORI , YAGINUMA TAKAO , KONO NAOFUMI
IPC分类号： H01L29/47 , H01L29/861 , H01L29/872 , H02M3/28
摘要： PURPOSE:To achieve a low loss of a semiconductor rectifier diode by specifying the following: an interval between third stripe-shaped semiconductor regions; their depth; and a width of a depletion layer formed between a first semiconductor region and the third semiconductor regions. CONSTITUTION:A semiconductor substrate 1 is provided with the following: a first n-type semiconductor region 13 adjacent to the surface 11; a second n type semiconductor region 14 adjacent to the main surface 12 on the other side; and a plurality of third p type stripe-shaped semiconductor regions 15. A mutual interval between the third semiconductor regions 15 is designated as W; a depth of the third semiconductor regions 15 is designated as Di a width of a depletion layer which is spread to the side of the first semiconductor region 13 by a diffusion potential of a p-n junction J formed between the first semiconductor region 13 and the third semiconductor regions 15 is designated as w0. Then, the third semiconductor regions 15 are formed so as to satisfy a relationship of 2wo

4. 发明专利

JPS6328259A SWITCHING REGULATOR CIRCUIT 失效
公开(公告)号：JPS6328259A
公开(公告)日：1988-02-05
申请号：JP17112086
申请日：1986-07-21
申请人： HITACHI LTD
发明人： KONO NAOFUMI
IPC分类号： H02M3/155
摘要： PURPOSE:To get up high switching speed and improve efficiency, by giving forward bias and reverse bias in turning ON and OFF a switching transistor respectively. CONSTITUTION:When a transistor 2 is forward-biased by the current flowing to a resistance 7 and begins to be biased OFF, the base current flows to the transistor 2 by the voltage induced by a coil 3 and positive feedback action is brought about and the transistor 2 rapidly turns OFF. When the current flowing to the coil 3 gets to more than the designated value, flyback action is brought about to the coil 3, to which negative voltage is induced. Thus, the transistor 2 is reverse-biased and rapidly biased OFF.

5. 发明专利

JPS61196770A PROTECTING CIRCUIT OF CAPACITOR DISCHARGING CIRCUIT 失效
公开(公告)号：JPS61196770A
公开(公告)日：1986-08-30
申请号：JP3634085
申请日：1985-02-27
申请人： HITACHI LTD
发明人： KONO NAOFUMI , FUJIE TOSHIAKI
IPC分类号： H02H7/20 , G05F1/10 , H02M7/06 , H02M7/12
摘要： PURPOSE:To effectively detect the malfunction of a switch element by adding means for detecting a current flowed to a discharging resistor in a circuit for connecting the resistor with a capacitor in an electronic device only when the device is interrupted from a power source. CONSTITUTION:A transistor 11 is turned OFF by opening a power switch 14, and a relay 2 and photocouplers 8, 10 are turned OFF to disconnect an AC power source 1 from a rectifier. When the photocoupler 8 is turned OFF, a transistor 7 is turned ON to discharge a capacitor 4 through a resistor 5. If a current is flowed to the resistor 5 when a power switch 14 is closed to energize the relay 2 ON, a photocoupler 9 is turned ON, and an SCR 12 is triggered. Thus, the transistor 11 is turned OFF to deenergize the relay 2.

6. 发明专利

JPH04364365A SMALL POWER UNIT 失效
公开(公告)号：JPH04364365A
公开(公告)日：1992-12-16
申请号：JP13880891
申请日：1991-06-11
申请人： HITACHI LTD
发明人： KANOUDA TAMAHIKO , SATO MASAYOSHI , ONDA KENICHI , HAGIWARA SHUYA , MIZOGUCHI TETSURO , KONO NAOFUMI , FUJIKAWA KATSUMI , KINO JIRO
IPC分类号： H01F19/00 , H02M3/28 , H02M7/06 , H02M7/12
摘要： PURPOSE:To provide a power source which is suitable in promoting the miniaturization and the thinning of OA equipment and information equipment. CONSTITUTION:The thicknesses of a transformer and a smoothing reactor are made below 7mm by raising the switching frequency to 1MHz and constituting the transformer and the smoothing reactor, using a thin plate coil and a thin core. Moreover, for parts saving, a power switching element for controlling the output power, its drive circuit, a control circuit, and a protective circuit are integrated an block in a power IC which has breakdown strength of 250V or more. To materialize high power conversion efficiency, the on resistance of the power switching element is made 0.8OMEGA or less. Accordingly, the volume of the power unit can be made 10mm in thickness and 80mm in length, and the miniaturization and thinning of OA equipment and information equipment can be realized.

7. 发明专利

JPS62272863A SMOOTHING CHOKE MOUNTING STRUCTURE 失效
公开(公告)号：JPS62272863A
公开(公告)日：1987-11-27
申请号：JP11075286
申请日：1986-05-16
申请人： HITACHI LTD
发明人： NISHISU KOUJI , KONO NAOFUMI
IPC分类号： H02M1/14 , H01F27/24
摘要： PURPOSE:To control a pulse width stably by combining to use a core having a large gap length, which enables the increase of a DC superposed current, and a core having a small gap length. CONSTITUTION:A smoothing choke is furnished with a pair of positive and negative conductors 1, a core 2 having a large gap length and a core 3 having a small gap length, and said pair of conductors 1 are passed through a pair of through holes made in the cores 2, 3, respectively, to constitute said smoothing choke. Further, each terminal of a capacitor is connected with each of conductors 1 so that a smoothing circuit is formed with the cores 2, 3 side of the pair of conductors 1 as an input side and the capacitor side thereof as an output side. In this way, an electric current flows in the direction of the arrow and the pair of conductors 1 function as one turn of coil. Within the range where a DC superposed current is small, therefore, a synthetic inductance can be increased, a critical current of an output smoothing circuit can be decreased and a stable pulse width control can be performed.

8. 发明专利

JPS5944852B2 JPS5944852B2 - 失效
公开(公告)号：JPS5944852B2
公开(公告)日：1984-11-01
申请号：JP5118277
申请日：1977-05-06
申请人： Hitachi Ltd
发明人： MYAZAKI SHOICHIRO , KONO NAOFUMI , YAMAJI KIMINORI
IPC分类号： H02J1/00 , G05F1/10

9. 发明专利

JP2001075175A PROJECTION TYPE DISPLAY DEVICE 失效
公开(公告)号：JP2001075175A
公开(公告)日：2001-03-23
申请号：JP24814099
申请日：1999-09-02
申请人： HITACHI LTD
发明人： IGARASHI TAKESHI , YOSHIKAWA HIROKI , KOIZUMI NAOHISA , SUZUKI HITOSHI , KONO NAOFUMI
IPC分类号： G02B6/00 , G02F1/13 , G02F1/1335 , G02F1/13357 , G03B21/14
摘要： PROBLEM TO BE SOLVED: To provide a projection type display device capable of correcting irregular luminance caused by an optical system unit for processing pictures. SOLUTION: This device is provided with a backlight unit, plural transmission type display units arranged on the same plane by leaving a space in-between, a screen, and the optical system unit including a Fresnel concave lens and processing and projecting the pictures displayed on the plural transmission type display units so that they may be a continuous picture on the screen. The backlight unit is constituted so that light from a light source may be emitted from micro elements arrayed in an array state, and has distribution on the light passing effective area (effective area for taking the light passing through a light transmission body 3 from the light sources 4a to 4d in the micro prism 10 constituting the micro element, that is, the contact area of the prism 10 with the light transmission body 3) of the micro elements arrayed in the array state. Thus, the irregular luminance caused by the optical system unit is corrected.

10. 发明专利

JPH0746837A SWITCHING POWER SUPPLY 失效
公开(公告)号：JPH0746837A
公开(公告)日：1995-02-14
申请号：JP18963093
申请日：1993-07-30
申请人： HITACHI LTD
发明人： KONO NAOFUMI , MIZUKAMI TOSHIHIKO , MIZUTA KOICHI , TOKUNAGA KIICHI
IPC分类号： H02M3/28
摘要： PURPOSE:To increase reliability without providing a spare power supply outside, by a construction wherein a plurality of voltage converters are connected in parallel and each control command is transmitted to other voltage converters in common, while an internal output voltage of each voltage converter is monitored and the existence or nonexistence of a failure is informed to the outside. CONSTITUTION:A switching power supply 1 is constructed by connecting a plurality of DC-DC converters 2 in parallel. In the case when an output voltage fluctuates herein, a comparator part 23 of each DC-DC voltage converter 2 transmits a control voltage signal 24 to output voltage control parts 25 of the other DC-DC converters 2 through a transmission line 4 and the switching power source 1 as a whole outputs a prescribed output voltage by coordinated operations. In the case of a short-circuit accident, a fuse 3 is blown out and the failing DC-DC converter 2 is cut off. Moreover, a failure detecting circuit 5 monitors a state of operation of each DC-DC converter 2 on the basis of DC voltage signal 26 and delivers a maintenance request signal outside when it detects the failure.

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