TWM449303U - Electromagnetic stylus for operating a capacitive touch panel - Google Patents

Abstract

When a user moves an electromagnetic stylus to a capacitive touch panel, a transceiving winding will detect the frequency of the capacitive touch panel. A synchronizing winding will oscillate to generate a signal having a frequency similar to that of the capacitive touch panel. An oscillator will amplify the signal generated by the synchronizing winding. A circuit board will process the signal amplified by the oscillator. Finally the transceiving winding will emit a wireless signal with a frequency similar to the that of the capacitive touch panel to interrupt an electric (magnetic) field of the capacitive touch panel so as to detect a triggered coordinate of the capacitive touch panel.

Description

Electromagnetic pen for operating capacitive touch panel

The present invention provides an electromagnetic pen, especially an electromagnetic pen for operating a capacitive touch panel.

The previous stylus has three working principles. The first one is a resistive stylus. The pressure is applied to the resistive touch panel to make the two conductive electrodes of the resistive touch panel contact. Measuring the position of the touched coordinate on the resistive touch panel; the second type is a capacitive stylus, the stylus is transmitted to the human hand via the conductor, and the capacitive touch panel is used to generate leakage current, and the coordinate position is calculated. For a capacitive stylus, if the capacitive stylus is insulated from the human body (such as wearing gloves), the capacitive touch panel cannot be operated; the third is an electromagnetic pen with a Digitizer. The electromagnetic pen emits a signal to the tablet or the tablet-sensing electromagnetic pen detects the position of the touched coordinate on the tablet. However, the stylus must be used with the tablet.

Please refer to FIGS. 1 to 2 . FIG. 1 is a schematic diagram of a conventional capacitive touch panel 10 , and FIG. 2 is a top view of the capacitive touch panel 10 . The capacitive touch panel 10 includes a first conductive layer 12, an insulating layer 14 and an anti-interference layer 16; the circuit on the first conductive layer 12 generates a uniform electrical (magnetic) field on the surface of the conductive layer when a voltage is applied. 26; the electronic interference prevention layer 16 prevents interference from external electronic signals. When the capacitive stylus contacts the capacitive touch panel 10, the leakage current flows to the human body through the stylus, and then instantaneously The electric (magnetic) field 26 is changed, and the leakage current of the capacitive touch panel 10 is changed. Therefore, the capacitive touch panel 10 can calculate the coordinate position of the capacitive touch panel 10 according to the change of the leakage current thereof. .

However, in many laboratories, the experimenter wears gloves or wears other insulating equipment to avoid accidents. In this case, if the experimenter uses a capacitive stylus to operate the capacitive touch panel 10, it will leak. The current cannot flow to the human body through the stylus, and the electric (magnetic) field 26 does not change. Therefore, the capacitive touch panel 10 cannot calculate the coordinate position at which the capacitive touch panel 10 is touched based on the change in its electrical (magnetic) field.

The embodiment of the present invention provides an electromagnetic pen for operating a capacitive touch panel, comprising a housing and a signal conducting body for reading a frequency signal of the capacitive touch panel, a transceiver coil, surrounding the a signal conductor for detecting a frequency of the capacitive touch panel and a wireless signal having a frequency similar to that of the capacitive touch panel, and a synchronization coil surrounding the signal conductor for oscillating the frequency and a frequency signal similar to the capacitive touch panel; an oscillator for amplifying the frequency signal generated by the oscillation of the synchronous coil; and a circuit board mounted in the housing and connected to the signal conductor for processing The frequency signal amplified by the oscillator.

In order to solve the problem that the capacitive touch panel 10 cannot detect the position of the touched coordinate when the user wears the insulator, one embodiment of the present invention proposes an electromagnetic pen so that the user wears an insulator regardless of whether or not the user wears an insulator. , can use the electromagnetic pen to operate Capacitive touch panel 10.

Please refer to FIG. 3, which is a schematic diagram of one of the electromagnetic pens 30 of the present invention. The electromagnetic pen 30 includes a casing 32. The signal conductor 36 is used to read the oscillation frequency of the capacitive touch panel 10. A transceiver coil 38 surrounds the signal conductor 36 for detecting the capacitive touch panel 10. The frequency and the frequency of the wireless signal similar to the capacitive touch panel, a synchronous coil 40 surrounds the signal conductor 36 for oscillating a signal having a frequency close to that of the capacitive touch panel 10, and an oscillator 42 for Amplifying the signal generated by the oscillation of the synchronous coil 40, a circuit board 34 is mounted in the housing 32 and connected to the signal conductor 36 for processing the signal amplified by the oscillator 42, and a battery 44 is mounted in the housing 32 for use. To power the electromagnetic pen 30, the oscillator 42 can be mounted on the circuit board 34.

When the user moves the electromagnetic pen 30 to the top of the capacitive touch panel 10, the transceiver coil 38 detects the frequency of the electric (magnetic) field of the capacitive touch panel 10, and the synchronous coil 40 oscillates the frequency and the capacitive touch. The control panel 10 flows to a signal similar to the signal conductor 36. The oscillator 42 amplifies the signal generated by the oscillation of the synchronous coil 40. The circuit board 34 processes the signal amplified by the oscillator 42. Finally, the transceiver coil 38 transmits the frequency and the capacitance. The wireless signals of the touch panel 10 having similar frequencies interfere with the electrical (magnetic) field of the original capacitive touch panel 10.

When the capacitive touch panel 10 receives the wireless signal from the transceiver coil 38, whether the phase of the wireless signal emitted by the transceiver coil 38 and the phase of the capacitive touch panel 10 are the same, the surface of the capacitive touch panel 10 is electrically Magnetic field will be disturbed, so electricity The capacitive touch panel 10 can calculate the coordinate position at which the capacitive touch panel 10 is activated according to the change of its electrical (magnetic) field.

Compared with the previous capacitive stylus, the electromagnetic pen 30 interferes with the electrical (magnetic) field of the capacitive touch panel 10 by transmitting a wireless signal having a frequency close to that of the capacitive touch panel 10, so even the user Wearing the glove or other insulator, the capacitive touch panel 10 can still derive the coordinate position of the capacitive touch panel 10 according to the change of its electrical (magnetic) field.

The above descriptions are only preferred embodiments of the present invention, and all changes and modifications made by the scope of the patent application of the present invention should be covered by the present invention.

10‧‧‧Capacitive touch panel

12‧‧‧First conductive layer

14‧‧‧Insulation

16‧‧‧Anti-interference layer

26‧‧‧Electrical (magnetic) field

30‧‧‧Electromagnetic pen

32‧‧‧ housing

34‧‧‧ boards

36‧‧‧Signal conductor

38‧‧‧Transceiver coil

40‧‧‧Synchronous coil

42‧‧‧Oscillator

44‧‧‧Battery

46‧‧‧Contacts

Figure 1 is a schematic diagram of a prior capacitive touch panel.

Figure 2 is a plan view of the capacitive touch panel of Figure 1.

Figure 3 is a schematic diagram of the electromagnetic pen of the present creation.

30‧‧‧Electromagnetic pen

32‧‧‧ housing

34‧‧‧ boards

36‧‧‧Signal conductor

38‧‧‧Transceiver coil

40‧‧‧Synchronous coil

42‧‧‧Oscillator

44‧‧‧Battery

46‧‧‧Contacts

Claims (3)

An electromagnetic pen for operating a capacitive touch panel includes: a housing; a signal conductor for reading a frequency signal of the capacitive touch panel; and a transceiver coil surrounding the signal conductor Receiving and transmitting a wireless signal similar to the frequency of the capacitive touch panel; a synchronous coil surrounding the signal conductor for oscillating a frequency signal having a frequency close to the capacitive touch panel; an oscillator, And a circuit board mounted in the housing and connected to the signal conductor for processing the frequency signal amplified by the oscillator. The electromagnetic pen of claim 1, wherein the oscillator is mounted on the circuit board. The electromagnetic pen according to claim 1, further comprising a battery installed in the housing for supplying power to the electromagnetic pen.