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1. 发明专利

JP2003295320A Image display device 审中-公开
标题翻译：图像显示设备
公开(公告)号：JP2003295320A
公开(公告)日：2003-10-15
申请号：JP2002102016
申请日：2002-04-04
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： IWATA HISAYA , IKEDA MIYUKI , KATAYAMA TAKESHI , OZAWA NAOHIRO
IPC分类号： G02F1/13 , G02F1/133 , G03B21/00 , G03B21/14 , G03B21/16 , H05B41/18 , H05B41/24
摘要： PROBLEM TO BE SOLVED: To provide a method of realizing prevention of a flicker which easily occurs owing to delay of a valve temperature rise of a lamp when the lamp is actuated in a low-power mode, relatively easily. SOLUTION: A timer is provided which measures the elapsed time after a start or restart and only when the lamp is started or restarted while the low-power mode is selected, the elapsed time from the start that the timer measures is used to place a lamp illumination power switching type stabilizer, which is originally in the low-power mode, in a normal-power mode up to set time, however a plurality of cooling fans which cool the lamp and others are rotated at low speeds to saturate the lamp temperature rapidly and after the set time, the normal power mode is entered to prevent a flicker. COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：提供一种实现防止在灯以低功率模式致动时由于灯的阀温升的延迟而容易发生的闪烁的方法。
解决方案：提供了一个定时器，用于测量启动或重新启动后的经过时间，并且仅在选择低功耗模式时启动或重新启动灯时，将从定时器测量开始的经过时间用于最初设置在低功率模式的灯泡照明功率开关型稳定器，以正常功率模式直到设定时间，然而，冷却灯等的多个冷却风扇以低速旋转以饱和灯泡温度快速，设定完成后，进入正常电源模式，防止闪烁。版权所有（C）2004，JPO

2. 发明专利

JP2007317410A Projection type display device 有权
标题翻译：投影型显示设备
公开(公告)号：JP2007317410A
公开(公告)日：2007-12-06
申请号：JP2006143516
申请日：2006-05-24
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： IWATA HISAYA , SAITO HIDEHARU , OZAWA NAOHIRO
IPC分类号： F21V29/02 , F21Y101/00 , G03B21/00 , G03B21/14 , G03B21/16
摘要： PROBLEM TO BE SOLVED: To provide a projection type display device capable of properly cooling a discharge lamp by considering reliability on the discharge lamp in cool-down after extinguishing the discharge lamp, in regard to the projection type display device using a cooling control method of cooling the outer surface and the inside of a light source unit.
SOLUTION: In the projection type display device for cooling the outer surface and the inside of the light source unit during the time when the power source is turned on, a controller reduces the amount of the cooling air inside the light source unit for a fixed time in the case wherein the power source is operated to be turned off, and stops the operation for cooling the outer surface and the inside of the light source unit after the fixed time passes.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供一种投影型显示装置，其能够在熄灭放电灯之后考虑放电灯在冷却时的可靠性来适当地冷却放电灯，关于使用冷却的投影型显示装置冷却光源单元的外表面和内部的控制方法。解决方案：在电源接通时用于冷却光源单元的外表面和内部的投影型显示装置中，控制器减少光源单元内的冷却空气的量，在电源被操作关闭的情况下的固定时间，并且在固定时间过去之后停止用于冷却光源单元的外表面和内部的操作。版权所有（C）2008，JPO＆INPIT

3. 发明专利

JPH1169816A POWER CIRCUIT 失效
公开(公告)号：JPH1169816A
公开(公告)日：1999-03-09
申请号：JP23067997
申请日：1997-08-27
申请人： HITACHI LTD
发明人： IWATA HISAYA
IPC分类号： H04N5/63 , H02M3/28
摘要： PROBLEM TO BE SOLVED: To make it possible to obtain compatibility with various types of power saving without any auxiliary power supply, by applying a direct-current supply voltage from a commercial power line to a primary-side PWM control circuit and the like when a switching stabilized power supply is started. SOLUTION: A circuit comprising diodes D1-D7 and capacitors C1-C3 is clamped from a commercial power supply 1 with a voltage required for applications 3, so that negative voltage will not be produced during a period of negative half-wave rectification. A clamp circuit is constituted of such diodes and capacitors. That is, a voltage requested by applications, such as PWM control circuit, is supplied from the commercial power supply only at the time of switch-on during a period of positive half-wave. When, after starting, stabilization is obtained, power supply is switched to that from a switching transistor T1, and power supply is stopped. When a switch 2 is turned on at this time, an alternating current is supplied from the commercial power supply 1, and half-wave voltage is applied to point A. As a result, the capacitance of the capacitor C2 for direct-current power supply dedicated to starting is made sufficiently smaller than the capacitance of C3.

4. 发明专利

JPH09121537A SHORT-CIRCUIT PROTECTIVE CIRCUIT FOR POWER SOURCE 失效
公开(公告)号：JPH09121537A
公开(公告)日：1997-05-06
申请号：JP27862695
申请日：1995-10-26
申请人： HITACHI LTD
发明人： AMAMIYA YOSHIO , IWATA HISAYA
IPC分类号： H04N3/26 , H02H3/08 , H02M3/28
摘要： PROBLEM TO BE SOLVED: To inexpensively make a power source circuit to surely work without providing any special electron intercepting circuit when the rectified output of the secondary winding of a switching transformer short-circuits by transmitting the pulse width of a switching pulse for driving the primary winding of the transformer to a control circuit and controlling the rectified output to a constant voltage. SOLUTION: When the load of a diode D7 short-circuits and no voltage is generated, the gate voltage of a shunt regulator Q4 is lowered to a ground voltage by using a diode D13. When the gate voltage of the regulator Q4 drops, the current at the photodiode section of a photocoupler Q1 decreases. As a result, the current at the phototransistor section of the photocoupler Q1 decreases and the potential at the resistor 14 of the emitter of the phototransistor section drops. The voltage is applied across an operational amplifier 2 through a resistor R15 and the output of the amplifier 2 is supplied to a pulse width modulator 5. Then the output of the modulator 5 is led to the base of a switching transistor or FET transistor Q3 through a buffer amplifier 6.

5. 发明专利

JPH09214801A S CURVE CORRECTION CAPACITOR SWITCHING CIRCUIT 失效
公开(公告)号：JPH09214801A
公开(公告)日：1997-08-15
申请号：JP1363396
申请日：1996-01-30
申请人： HITACHI LTD
发明人： IWATA HISAYA
IPC分类号： H04N3/23
摘要： PROBLEM TO BE SOLVED: To provide a circuit whose entire S curve correction capacitance is made variable by connecting or disconnecting an another S curve correction capacitor to or from an S curve correction capacitor at a deflection yoke side of a diode modulation system horizontal deflection output circuit by means of a switch FET. SOLUTION: An S curve correction capacitance changeover circuit 2 is provided in parallel with an S curve correction capacitor C1 of a horizontal deflection output circuit 1 and a frequency of a received horizontal synchronizing signal is discriminated to control the circuit of an added S curve correction capacitor C3. That is, in the case that a low level signal is given to a base of an additional S curve correction capacitor switching FET driver transistor(TR) Q1, since the TR Q1 is cut off, the additional S curve correction capacitor C3 is connected in parallel with the S curve correction capacitor C1 so as to increase the S curve correction capacitance as a whole. On the other hand, in the case that a high level signal is given to the base of the TR Q1, the additional S curve correction capacitor C3 is disconnected and the S curve correction capacitance results from the S curve correction capacitor C1 only.

6. 发明专利

JPH07298084A HORIZONTAL DEFLECTION CIRCUIT 失效
公开(公告)号：JPH07298084A
公开(公告)日：1995-11-10
申请号：JP8435594
申请日：1994-04-22
申请人： HITACHI LTD
发明人： IWATA HISAYA
IPC分类号： H04N3/16 , H04N3/18
摘要： PURPOSE:To provide a horizontal deflection circuit provided with a variable drive power supply driving optimizingly a horizontal deflection output circuit with respect to a change in a horizontal frequency of an input signal and a horizontal pattern size. CONSTITUTION:The-circuit is made up of a microcomputer circuit 2 processing an input signal and information of a horizontal pattern size, a DAC (DC converter) 3 converting the information by the microcomputer 2 into a DC voltage, a variable drive power supply 5 controlled by an output voltage of the DAC and a horizontal deflection output circuit 6. Since the horizontal deflection output circuit 6 is driven optimizingly at all times against a change in a horizontal frequency of an input signal and a horizontal pattern size, heating/destruction of a horizontal output transistor(TR) are prevented and deterioration in the horizontal linearity is prevented.

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