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1. 发明公开

EP0101502A4 HIGH RESOLUTION LIGHT PEN FOR USE WITH GRAPHIC DISPLAYS. 失效
标题翻译：轻质弹簧高分辨率FOR USE IN图。
公开(公告)号：EP0101502A4
公开(公告)日：1985-10-24
申请号：EP83901012
申请日：1983-02-07
申请人： HARRIS CORP
发明人： MAY GEORGE A
IPC分类号： G06F3/153 , G06F3/033 , G06F3/037 , G06K11/06 , H03K6/00 , H01J5/16 , G06K7/10 , H03K5/24
CPC分类号： G06F3/03542
摘要： A high resolution light pen is disclosed for use with graphic displays and more particularly, a light pen (10) having a collimation tube (22) slidably mounted within a housing (20). The collimation tube includes an axially extending channel (38) having a non-reflective surface. A photodetector (30) is fixably mounted within the housing aligned with the channel. A lens (42) is mounted adjacent the front end of the channel and has a focal length equal to the spacing between the lens and an aligned pixel (P2) of the video screen. By this arrangement, all light rays emanating from an aligned pixel and passing through the lens are refracted axially along the channel and directed to the photodetector thereby maximizing the input thereto. The light pen further includes a discrimination circuit which generates an interrupt signals for reading an address counter. The discrimination circuit generates an interrupt signal when the signal from the photodetector is valid. The interrupt signal is generated at a time which is substantially independent of the amplitude and slope of the signals thereby reducing the effects ofjitter.

2. 发明公开

EP0124526A4 TELEPHONE SYSTEM WITH COMPUTER GENERATED DIAL PAD AND AUTOMATIC DIALLING. 失效
标题翻译：所得电力由内容和自动个数选择一个数的计算机电话系统。
公开(公告)号：EP0124526A4
公开(公告)日：1988-02-23
申请号：EP83901145
申请日：1983-02-25
申请人： HARRIS CORP
发明人： MAY GEORGE A , STROBEL HENRY A
IPC分类号： H04M1/26 , H04M1/24 , H04M1/274 , H04M1/2745 , H04M1/30
CPC分类号： H04M1/30 , H04M1/27455 , H04M1/274591 , Y10S345/902

3. 发明专利

CA1221480A HIGH RESOLUTION LIGHT PEN FOR USE WITH GRAPHIC DISPLAYS 未知
公开(公告)号：CA1221480A
公开(公告)日：1987-05-05
申请号：CA420927
申请日：1983-02-04
申请人： HARRIS CORP
发明人： MAY GEORGE A
IPC分类号： G06F3/153 , G06F3/033 , G06F3/037 , G06K11/06 , H03K6/00 , H01J5/16 , G06K7/10 , H03K5/24
摘要： A high resolution light pen is disclosed for use with graphic displays. More particularly, a light pen is disclosed having a collimation tube slidably mounted within a housing. The collimation tube includes an axially extending channel having a non-reflective surface. A photodetector is fixably mounted within the housing aligned with the channel. A lens is mounted adjacent the front end of the channel and has a focal length equal to the spacing between the lens and an aligned pixel of the video screen. By this arrangement, all light rays emanating from an aligned pixel and passing through the lens are refracted axially along the channel and directed to the photodetector thereby maximizing the input thereto. The subject invention further includes a new and improved discrimination circuit for determining valid input signals from the light pen and producing an interrupt signal at a time substantially independent of the amplitude and slope of the input signals. In accordance with the subject invention, each input signal is compared with an upper threshold level to determine if a valid signal has been detected. In addition, each input pulse is compared to a lower threshold level for timing purposes. The result of the comparison with the lower threshold level is delayed and supplied to a gate means with the output of the first comparison. The gate functions to produce an output signal when the results of both comparisons received are simultaneously positive thereby indicating the validity of the input pulse at a time independent of the amplitude of the pulse whereby the effects of jitter are reduced.

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