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公开(公告)号：GB2339486A
公开(公告)日：2000-01-26
申请号：GB9816437
申请日：1998-07-28
Applicant: PRIMAX ELECTRONICS LTD
Inventor： LIU SHU-MING
Abstract: A method of simulating two-way communications over a one-way communications system, enabling an indicator on the transmitter to reflect the manner in which signals from a function key on the transmitter side will be interpreted by an application on the receiver side of the communications system, is carried out by causing a list of current states of the function on the receiver side of the communications system rather than transmitting a signal concerning the current state of the list to the transmitter side. The transmitter side of the communication system is part of a wireless keyboard that does not include a receiver to properly indicate which of two possible states a function of the computer will be in even though the computer has no way of communicating that state to the receiver.
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公开(公告)号：GB2339486B
公开(公告)日：2003-04-09
申请号：GB9816437
申请日：1998-07-28
Applicant: PRIMAX ELECTRONICS LTD
Inventor： LIU SHU-MING
Abstract: A method of simulating two-way communications over a one-way communications system, enabling an indicator on the transmitter to reflect the manner in which signals from a function key on the transmitter side will be interpreted by an application on the receiver side of the communications system, is carried out by causing a list of current states of the function on the receiver side of the communications system rather than transmitting a signal concerning the current state of the list to the transmitter side. The transmitter side of the communication system is part of a wireless keyboard that does not include a receiver to properly indicate which of two possible states a function of the computer will be in even though the computer has no way of communicating that state to the receiver.
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公开(公告)号：DE19912420C2
公开(公告)日：2003-04-17
申请号：DE19912420
申请日：1999-03-19
Applicant: PRIMAX ELECTRONICS LTD
Inventor： LIU SHU-MING
Abstract: The present invention provides a computer joystick which will convert movements of its control stick into digital signals. The computer joystick comprises a housing with an opening on its top, a control stick, and two optical sensing devices for detecting movements of the control stick in two perpendicular directions and generating corresponding displacement signals. The control stick comprises a handle installed at its top section, a ball-shaped portion installed at its middle section, and a driving mechanism installed at its bottom section. Each of the optical sensing devices comprises an optical panel comprising a plurality of light transmitting holes installed on it, a light source and a plurality of optic sensors installed at opposite sides of the optical panel, and a plurality of comparators for comparing detecting signals generated by the optic sensors so as to generate the displacement signals. When the handle of the control stick is moved, the driving mechanism of the control stick will rotate the optical panel so as to move the light transmitting holes on it, the comparators will then compare the detecting signals generated by the optic sensors based on movements of the light transmitting holes so as to generate a corresponding displacement signal.
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公开(公告)号：DE19755157C2
公开(公告)日：2001-10-11
申请号：DE19755157
申请日：1997-12-11
Applicant: PRIMAX ELECTRONICS LTD
Inventor： LIU SHU-MING
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公开(公告)号：DE19913337C2
公开(公告)日：2001-07-26
申请号：DE19913337
申请日：1999-03-24
Applicant: PRIMAX ELECTRONICS LTD
Inventor： LIU SHU-MING
Abstract: A quadrature encoding device with slope-triggered digitizing circuit is provided for use in a mechanical mouse. The quadrature encoding device is capable of producing two square-wave signals indicative of the current mouse movement for position control of the mouse cursor on the computer screen. The slope-triggered digitizing circuit includes a delay circuit and an analog comparator, which is capable of generating a first voltage output when the slope of the opto-electrical signal from the photo detector is positive, and a second voltage output when the slope is negative. It is characteristic feature of the quadrature encoding device that the output characteristic of the slope-triggered digitizing circuit would not be affected by any deviations in the output characteristic of the associated photo detectors, and also would not be affected by the ambient light. Moreover, the quadrature encoding device can operate without having to make adjustments on threshold voltage, which makes the quadrature encoding device more convenient to use, simpler in circuit complexity, and lower in manufacturing cost as compared to the prior art.
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Patent Agency Ranking
公开(公告)号：DE19912420A1
公开(公告)日：2000-01-05
申请号：DE19912420
申请日：1999-03-19
Applicant: PRIMAX ELECTRONICS LTD
Inventor： LIU SHU-MING
Abstract: The computer joystick has a housing with a control stick rotatable in an opening with a drive mechanism. Two optical detectors producing position variation signals corresponding to the drive mechanism movement in two mutually perpendicular directions. The detectors each contain an optical plate (55), a light source, optical sensors (66a/b/c/d) and signal comparators (72,74).
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公开(公告)号：DE19913337A1
公开(公告)日：1999-11-25
申请号：DE19913337
申请日：1999-03-24
Applicant: PRIMAX ELECTRONICS LTD
Inventor： LIU SHU-MING
IPC: G01D5/244 , G06F3/0354 , G06F3/033 , G06K11/08 , G06K11/18
Abstract: The control of a screen cursor with a mechanical mouse uses a quadrature coding system with an edge triggered digitising circuit (740). The coding system interprets two square wave signals generated by movement of the mouse . The digitising circuit is based around an analogue comparator (930) and a passive time delay (910)circuit.
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公开(公告)号：DE19825285A1
公开(公告)日：1999-12-09
申请号：DE19825285
申请日：1998-06-05
Applicant: PRIMAX ELECTRONICS LTD
Inventor： WANG HAN-CHE , LIU SHU-MING , YEN HONG-CHE , CHANG CHEN-MING
IPC: G05G9/047 , G06F3/0354 , G06F3/038 , G06F3/033 , G06K7/04
Abstract: The pointer device (20) has a joystick (32) arranged vertically in an aperture (26) of a casing (24), having lower end (36) in contact with vertical sensor (28), and upper end rising through the aperture. The joystick is horizontally movable within a predetermined angle. Movement of the joystick triggers a horizontal sensor (30), downward movement triggers vertical sensor. The pointer device (20) includes a base-plate (22), a casing (24) arranged on the base-plate, a vertical sensor (28) arranged underneath an aperture (26) of the casing, and several horizontal sensors (30) arranged next to the vertical sensor. A joystick (32) is arranged vertically within the aperture of the casing, having a lower end (36) in contact with the vertical sensor, and an upper end rising through the aperture of the casing. The joystick is horizontally movable within a predetermined angle in reference to the lower end. A horizontal movement of the joystick triggers one of the horizontal sensors, while a downward movement triggers the vertical sensor. A control arrangement (60) is connected electrically with the vertical and horizontal sensors for detecting the vertical or horizontal movements, and for producing corresponding signals.
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公开(公告)号：DE19755157A1
公开(公告)日：1999-04-29
申请号：DE19755157
申请日：1997-12-11
Applicant: PRIMAX ELECTRONICS LTD
Inventor： LIU SHU-MING
Abstract: The detector has an optical scanning device (36) for detecting the movement of a disc (34) relative to the scanning device. The scanning device has two light detectors for detecting the light transmitted through positioning holes (47,48) and coding holes (45,46) respectively. The holes are positioned so that when a positioning hole is detected by the first light detector, the second detector detects a predetermined number of corresponding coding holes.
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公开(公告)号：DE19755158A1
公开(公告)日：1998-12-24
申请号：DE19755158
申请日：1997-12-11
Applicant: PRIMAX ELECTRONICS LTD
Inventor： LIU SHU-MING
Abstract: The input device (30) transfers an input signal to the game port (16) of a computer. The game port includes a capacitor (18) and a detector circuit (20) for sensing the charge time of the capacitor to a threshold voltage, discharging the capacitor upon reaching the voltage, and for transferring the detected charge time as an input to the computer. A first charging circuit (36) is connected to the capacitor for quick charging. A second charging circuit is activated in accordance with the input signal. A control circuit (34) activates the second charging circuit such that the capacitor is rapidly charged to the threshold voltage.
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