公开(公告)号：US5260626A

公开(公告)日：1993-11-09

申请号：US837756

申请日：1992-02-19

申请人： Katsuhisa Takase ,  Masakazu Terada ,  Yoshikazu Sakai ,  Masatoshi Michihata ,  Yoshiyuki Nakashima

发明人： Katsuhisa Takase ,  Masakazu Terada ,  Yoshikazu Sakai ,  Masatoshi Michihata ,  Yoshiyuki Nakashima

IPC分类号： H01J29/00 ,  H04N9/29 ,  H01J1/52 ,  H01J5/02

CPC分类号： H01J29/003 ,  H04N9/29 ,  H01J2229/0015 ,  H01J2229/0053

摘要： In order to eliminate any harmful influence due to electric field radiation on the human body, electric field radiation from a front surface of a cathode ray tube is reduced. A degaussing coil arranged in proximity to a peripheral edge of a front surface of a cathode ray tube is employed advantageously. The degaussing coil is supplied with a voltage which is opposite in polarity to an electric field radiated from the front surface of the cathode ray tube. The reverse polarity voltage is derived from an output signal obtained from an output signal of a horizontal deflection circuit by a flyback transformer and/or derived from a voltage obtained by phase-inverting an anode voltage fluctuating in vertical synchronization. After a degaussing operation is completed, relay contacts are opened on the basis of a timer-controlled relay switch, thereby completely cutting the connection between the degaussing coil and a degaussing power source generating an alternating current which is supplied to the degaussing coil for the degaussing operation.

公开(公告)号：US06504534B1

公开(公告)日：2003-01-07

申请号：US08712091

申请日：1996-05-02

申请人： Katsuhisa Takase ,  Yuichi Komatsu ,  Hajime Torii ,  Toshihisa Tanabe ,  Kazuhiro Konishi ,  Hideo Katada

发明人： Katsuhisa Takase ,  Yuichi Komatsu ,  Hajime Torii ,  Toshihisa Tanabe ,  Kazuhiro Konishi ,  Hideo Katada

IPC分类号： G09G100

CPC分类号： G06F1/3218 ,  G06F1/3265 ,  G09G1/005 ,  G09G2330/021 ,  G09G2330/022 ,  H04N5/63 ,  H04N5/68 ,  Y02D10/153

摘要： When a “screen saver” operates to display a homogeneous black picture image after the same image is continuously displayed on a CRT for a predetermined period of time, a power supply for a CRT display unit is controlled to be turned off, thereby preventing the CRT display unit from being left for a long time in a power-on state. Namely, a waiting time of 3 minutes, for example, is provided when the “screen saver” operates so that the CRT displays a homogeneous black picture image to turn off a power circuit for the CRT, and then a heater for the CRT is turned off after a lapse of a predetermined period of time of 5 to 60 minutes, for example. An extension graphics board, which is inserted in an open slot provided in a computer of an open architecture type may be provided to perform this function. The extension graphics board has an input detection part including a keyboard access detection part for detecting an address signal which is supplied to an address bus in response to manipulation of a keyboard, and an interruption request detection part for detecting an interruption signal which is output in response to manipulation of a mouse. A timer is reset when the input detection part detects the presence of an input signal received from the keyboard or the mouse. When no reset signal is supplied from the input detection part again before a lapse of a period of time which is previously set in the timer, a blank signal is supplied to the CRT display unit.

摘要翻译： 当在“预定时间段”连续显示相同的图像之后，当“屏幕保护程序”操作以显示均匀的黑色图像图像时，控制CRT显示单元的电源被关闭，从而防止CRT 显示单元长时间处于开机状态。 即，当“屏幕保护程序”工作时，提供3分钟的等待时间，使得CRT显示均匀的黑色图像图像以关闭CRT的电源电路，然后使用于CRT的加热器被转动 例如在经过5〜60分钟的预定时间段之后关闭。 可以提供插入设置在开放架构类型的计算机中的开放槽中的扩展图形板来执行该功能。 扩展图形板具有输入检测部分，其包括键盘访问检测部分，用于响应于键盘的操作而检测提供给地址总线的地址信号;以及中断请求检测部分，用于检测输出的中断信号 响应操纵鼠标。 当输入检测部分检测到从键盘或鼠标接收的输入信号的存在时，定时器被复位。 当在经过预先设定在定时器中的时间段之前再次从输入检测部分提供复位信号时，空白信号被提供给CRT显示单元。