Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Reexamination Certificate
2000-10-13
2003-02-04
Shalwala, Bipin (Department: 2673)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
C345S174000, C345S179000, C178S018010, C178S018030, C178S018050, C178S018060, C178S019010, C178S019030
Reexamination Certificate
active
06515654
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a touch-type pointing device with wireless input capability and, more particularly, to a touch-type pointing device having a sensing pen which is able to execute and confirm the operation of inputting coordinate point in wireless manner.
2. Description of Related Art
The touch pad is a well-known computer input device for providing functions similar to those of the mouse and track ball. As shown in
FIG. 5
, the touch pad
70
has a transparent electrode
71
and a plurality of buttons
72
~
74
for connecting to the control circuit (not shown) therein. The output of the control circuit is connected to the input port of a computer via conductive wires.
In use of the touch pad, a sensing pen
80
is provided to touch a coordinate point on the transparent electrode
71
, so as to select a corresponding coordinate point on the computer screen. After the desired coordinate point is selected, the buttons
72
~
74
of the touch pad
70
are pressed to confirm and execute the input operation.
The above input operation is not convenient because the user must use both of his/her hands to hold the sensing pen
80
and press the buttons
72
~
74
of the touch pad
70
at the same time. Furthermore, the touch pad
70
is generally as small as a palm for the user to hold by one hand, and thus, it is not easy to have one hand hold the sensing pen
80
and the other hand press the buttons
72
~
74
while holding the touch pad
70
. Therefore, there is a desired to have a novel touch-type pointing device to mitigate and/or obviate the aforementioned problems.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a touch-type pointing device with wireless input capability for being conveniently operated by the user.
To achieve the object, the touch-type pointing device in accordance with the present invention includes a touch unit and a sensing pen. The touch unit has a transparent electrode and a control circuit connected to the transparent electrode for detecting a variance of impedance in the transparent electrode to have a signal representing a coordinate point, and transmitting and receiving signals. The sensing pen has a plurality of switches, each being closed to form a LC loop for transmitting signals in response to the signals from the touch unit.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4678869 (1987-07-01), Kable
patent: 5194852 (1993-03-01), More et al.
patent: 5455574 (1995-10-01), Itaya et al.
Hamilton Brook Smith & Reynolds P.C.
Nguyen Jimmy H.
Shalwala Bipin
Taiwan Regular Electronics
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