DE102015220811A1 - Pencil with thin tip for capacitive touch fields - Google Patents

Abstract

The invention relates to an electronic pointing device (101) for carrying out inputs (107) on a digital input device (102) with an electrically capacitive touchpad (108), the electronic pointing device being electrically capacitively coupled to an electrical measurement signal of the touchpad (108). which is characterized in that the electronic pointing device (101) comprises at least one electronic circuit component (200) configured to modulate the electrical capacitance in the tip (104) of the electronic pointing device (101).

Description

State of the art

The invention relates to a device specified in the preamble of claim 1 species, a method specified in the preamble of claim 10 species, and a system specified in the preamble of claim 11 Art.

Modern digital input devices can be controlled via a touch-sensitive electrically capacitive input surface, hereinafter called electrically capacitive touchpad or simple touchpad. Capacitive-acting systems are particularly widespread, in which e.g. a grid of printed conductors or a grid of electrodes, which is applied on the underside of the cover disk of the input surface, is placed under an AC voltage.

As the user's finger or pointing device approaches a node of the grid, the finger or pointing device and traces or electrodes form the two plates of a capacitor, and the cover of the touchpad forms its dielectric.

By virtue of the fact that the tracks are part of an RC element, that is to say part of a circuit with resistor and capacitor, the change in capacitance can be measured by the proximity of the finger or pointing device, thereby determining the point of contact.

For example, describes the US Pat. No. 7 612 767 B1 Such a conventional pointing device for a touch panel, which can take the electric field emanating from the generated by AC voltage projected capacitive sensor field of the input surface outgoing electrical charges and can cause an increase of the capacity or the effective capacity of the pointing device by generating a counter voltage, so that the pointing device may affect, via the electrical capacitive coupling to the input surface, an existing electrical charge accumulation on the input surface in a manner that can be interpreted by the input surface of the digital input device as being touched by a finger.

One disadvantage of such pointing devices or digital input systems, however, is that it is not possible to distinguish between input surface touches by an electronic pointing device and input surface touches by a user's hand or finger.

In addition, known pointing devices on a relatively large contact surface of your tip, which can not least adversely affect the compactness and ergonomics of the pointing device.

In addition, conventional electronic pointing devices are not universally applicable for all existing digital input devices electrically capacitive touchpad, but in each case only for the subset of electrically capacitive touch panels whose evaluation is able to recognize the electronic pointing device used.

task

It is therefore an object of the invention to improve an electronic pointing device for a digital input device, in particular with regard to the versatility of the usability of the electronic pointing device, and among other things, also in terms of compactness and ergonomics of the electronic pointing device.

solution

This is inventively achieved by an electronic pointing device according to claim 1, a method according to claim 10 and a system according to claim 11. Advantageous embodiments and further developments are the subject of the dependent claims.

An electronic pointing device according to the invention for carrying out inputs to a digital input device with an electrically capacitive touchpad, wherein the electronic pointing device is electrically capacitively coupled to an electrical measurement signal of the touchpad, may comprise at least one electronic circuit component configured to increase the electrical capacitance in the To modulate tip of the electronic pointing device.

The term electronic circuit component may include an electronic circuit or a plurality of electronic circuits having at least one electronic component.

The term of an electrical measurement signal should also be understood to mean, in particular, an electrical measurement signal which may comprise a series of electrical measurement pulses, in particular, for example, a sequence of alternating-current pulses.

In this case, the individual measuring pulses of the touchpad of the digital input device, for example, with a frequency of 90 to 270 kHz swing, and the sequence of measurement signal pulses with pulse durations of eg 100 to 400 microseconds (microseconds), for example, have a frequency between 40 to 240 Hz. This allows, for example, to operate sequentially at 60 Hz up to 41 measuring electrodes of a touchpad (41 × 0.4 = 16.4 ms), which, for example, enables a spatial resolution of a 200 mm wide touchpad with strips of 4.8 mm width.

The term modulation of the electrical capacitance in the tip of the electronic pointing device may, in particular, be understood to mean a sequence or the modulation of a sequence of capacitance state changes of the capacitance or of the effective or effective capacitance of the tip of the electronic pointing device.

The term modulation of the electrical capacitance in the tip of the electronic pointing device may further include capacitance state changes in which the sign of the capacitance and / or the magnitude of the capacitance value and / or the duration of the capacitance state are changed. Also, the notion of modulating the electrical capacitance in the tip of the electronic pointing device may include periodic or aperiodic capacitance state changes at particular time intervals or at certain time intervals.

The electronic circuit component of the electronic pointing device may be configured to perform a modulation of the electrical capacitance of the tip of the electronic pointing device such that e.g. between at least two capacitance states of the peak, and wherein at least one capacitance state can assume a capacitance value which may be below a predetermined capacitance value, for example below a capacitance detection threshold value of the touchpad of a digital input device.

The electronic circuit component of the electronic pointing device may be further configured to perform a modulation of the electrical capacitance of the tip of the electronic pointing device such that at least two peak capacitance states may be switched, wherein at least one capacitance state may assume a capacitance value equal to or greater than may be a predetermined capacitance value, for example a capacitance detection threshold value of the touchpad of a digital input device.

The electronic circuit component of the electronic pointing device may also be configured to selectively and / or automatically switch between said modulations.

In other words, the electronic circuit component may be configured to perform modulation of the electrical capacitance of the tip of the electronic pointing device such that at least two peak capacitance states may be switched, and wherein at least one capacitance state may assume a capacitance value below a predetermined capacitance value, for example, below a capacitance detection threshold of the touchpad of a digital input device, and wherein at least one capacitance state may assume a capacitance value that may be equal to or greater than a predetermined capacitance value, such as a capacitance detection threshold of the touchpad of a digital input device.

An inventive electronic pointing device offers numerous advantages over known electronic pointing devices.

Advantageously, in particular e.g. be differentiated by the inventive modulation of the electrical capacitance in the tip of the electronic pointing device touches of the touchpad by the electronic pointing device of touch by the hand or fingers of the user, since the hand or fingers of the user have no inventive modulation of the electrical capacitance.

For example, as mentioned, the modulation of the electrical capacitance of the tip of the electronic pointing device by the electronic circuit component includes, for example, capacitance states having capacitance values that are below a capacitance detection threshold of the touchpad of a digital input device, ie capacitance states with capacitance values where the touchpad would not detect or register a touch, can therefore be achieved that the touch panel alternately or according to the realized modulation, detects a touch and does not recognize.

This may advantageously allow to distinguish a touch of the touchpad by the tip of the pointing device from the touch of the touchpad by a hand or by the user's fingers, since a touch by a hand or fingers of the user have no such modulation, since touches through a hand or by finger practically always a capacity change, or a capacity increase, trigger on the touchpad, with capacity values that are large enough or high enough to the touch panel or from the Evaluation of the touch panel registered as a touch and to be recognized.

By contrast, the electronic pointing device according to the invention can trigger a modulation of the electrical capacitance registered by the touch panel or the digital input device, which is different from the user's hand or finger.

In addition, by the inventive modulation of the electrical capacitance in the tip of the electronic pointing device, the electronic pointing device can reduce the sensitivity of the touch panel of the digital input device, i. the sensitivity of the touchpad can be registered with the electrical capacitive signals can be adjusted.

For example, as mentioned, the modulation of the electrical capacitance of the tip of the electronic pointing device by the electronic circuit component includes, for example, capacitance states having capacitance values equal to or greater than a predetermined capacitance value, such as a capacitance detection threshold of the touchpad of a digital input device Touching the electronic pointing device from the touch panel of the digital input device can be reliably detected.

In this way, the electronic pointing device can be operated universally with each electrically capacitive acting touch panel of a digital input device, regardless of the electrical capacitive sensitivity of the touchpad.

The electronic circuit component of the electronic pointing device may also be configured to perform a modulation of a sequence of capacitive state changes such that capacitance states are changed individually or in groups.

This may advantageously allow the modulation of the electrical capacitance in the tip of the electronic pointing device to be controlled precisely and to be optimized with regard to the properties of the touchpad or the characteristics of the evaluation electronics of the touchpad.

The electronic circuit component can be designed, for example, as follows, or enable the following operation.

Upon contact of the tip of the electronic pointing device with the touchpad, a small capacitive charge transfer current may flow between the touchpad and the tip. For example, this shift current picked up by the tip can first flow via a capacitor to a local ground potential of a voltage-current converter.

The voltage-current converter may additionally include an impedance converter, and have several outputs, such as a current output and optionally a voltage output.

The current at the current output of the voltage-current converter can be an image of the voltage drop across the said capacitor. Since the contact capacitance with the capacitor can form a capacitive voltage divider, the voltage at the input of the voltage-current converter and thus the current at its current output can be in phase with the electrical measurement signal, or the measurement voltage, of the touchpad.

The current at the current output of the voltage-current converter can then be converted via a resistor into a voltage relative to a system ground.

This voltage can be amplified by an amplifier and fed into the local ground potential of the voltage-current converter. The effective amplification and the polarity of the amplification can be suitably adjusted, for example, via a control signal of a digital control unit, for example a microcontroller.

By way of example, the input voltage present at the voltage-current converter / impedance converter, or an image of the voltage at the tip of the electronic pointing device, can be fed to the amplifier (s) via the optional voltage output of the voltage-current converter or impedance converter.

Depending on whether the voltage controlled by the digital control unit and fed through the amplifier is in antiphase or in phase with the voltage across said capacitor, the electrical capacitance in the tip of the electronic pointing device, e.g. based on a reference capacity or limit capacity, increased or decreased.

Particularly in the case of a reduction of the electrical capacitance in the tip of the electronic pointing device which can be carried out by the electronic circuit component via the regulation of the positive voltage, it may be advantageous, for example directly, to provide the voltage for the modulation of the electrical capacitance via a voltage output of the voltage-current converter in the pointing device tip, since this can reduce the circuit complexity and in this case to stabilize the Suppression of unwanted electrical vibrations can be dispensed with.

Said voltage in phase opposition to the voltage across said capacitor of the tip can also be referred to as a reverse voltage, and said voltage in phase to the voltage across said capacitor of the tip, as a clamping.

In an operating mode in which the electronic circuit component changes the electrical capacitance or the electrically effective capacitance in the tip of the electronic pointing device by generating a reverse voltage, for example, the electronic circuit component can be regarded as a current-controlled negative impedance converter.

A counter voltage generated by the electronic circuit component, or inverse voltage generated with respect to the touch panel, may have an effect, ie whether a negative capacitance would be connected in series with the capacitance between the tip and the touchpad, which are registered by the touchpad as an increased or increased capacitance can.

Advantageously, the electronic circuit component can be configured to limit the amount of a negative voltage generated for a modulation of the electrical capacitance of the tip of the electronic pointing device to a maximum value, to avoid unwanted electrical oscillations of the electrical capacitive coupling between the pointing device and touchpad.

The regulation of the reverse voltage to stabilize the function and operation of the electronic circuit component, or the electronic pointing device, can be done dynamically. For example, the digital control unit, e.g. a microcontroller, the amplitude of the counter voltage continuously measure, monitor and regulate, so that if necessary, the counter-voltage can be reduced to avoid said unwanted electrical vibrations, but it can be ensured that a sufficiently high counter voltage can be generated, which one of the touchpad can produce detectable and detectable electrical capacitance in the tip of the electronic pointing device.

As already mentioned, in an operation of the electronic circuit component in which the electrical capacitance in the tip of the electronic pointing device is reduced via the control of the clamping voltage, such a stabilizing control can be dispensed with, e.g. the voltage which is available via a voltage output of the voltage-current converter will be used directly for the modulation of the electrical capacitance in the pointing device tip.

The electronic circuit component may also be configured to perform the modulation of the electrical capacitance in the tip of the electronic pointing device in synchronism with a measurement frequency of the digital input device with the touch position determining sensors of the touchpad, e.g. Electrodes, to be queried.

Such a synchronization of the modulation of the electrical capacitance in the tip with the measurement cycles of the touch pad for determining contact position, it may advantageously allow to define unique capacity modulations which can be particularly easily and clearly recognized by the transmitter of the touchpad.

For example, modulation patterns are conceivable in which e.g. over three measurement cycles of the touchpad, the tip of the electronic pointing device assumes a first capacitance state, followed by two measurement cycles of the touchpad where the tip of the electronic pointing device assumes a second capacitance state.

The detection of a measurement cycle of the touchpad from the electronic pointing device, may e.g. via an amplitude measurement of the recorded voltage via the contact with the touch panel.

In addition, the inventive modulation of the electrical capacitance in the tip of the electronic pointing device, the tip of the electronic pointing device can be made more compact compared with conventional electronic pointing devices, and for example, the surface of the tip with which a contact with the touch panel can be made, average diameter smaller than 3 mm.

Preferably, e.g. for an advantageous ergonomic design and / or a greater accuracy of the inputs on the touchpad, the contact surface of the tip of the electronic pointing device have an average diameter of 2-3 mm.

The inventive modulation of the electrical capacitance in the tip of the electronic pointing device compared to conventional electronic pointing devices, therefore, for example, allows the use of thinner tips, or tips with smaller diameters, and thus advantageously improves the accuracy of the inputs to a touchpad of a digital Input device can be performed by means of the electronic pointing device, as a higher resolution of contact positions on the touchpad can be supported.

An inventive method for performing inputs to a digital input device with electrically capacitive touch-sensitive input surface, ie with touchpad, by means of an electronic pointing device may include, for example, the following steps:
A recording of an electrical measurement signal of the touchpad ( 108 ) on the electronic pointing device ( 101 )
A modulation of the electrical capacitance in the tip of the electronic pointing device ( 101 ).

An inventive system for performing and detecting inputs on a digital input device with an electrically capacitive touchpad can comprise the following components:
A digital input device with an electrically capacitive touchpad, an electronic pointing device for making inputs to said digital input device, wherein the electronic pointing device is electrically capacitively coupled to an electrical measurement signal of the touchpad, wherein the electronic pointing device is configured to receive an electrical measurement signal from the touchpad to record, and
wherein the electronic pointing device comprises at least one electronic circuit component which may be configured to modulate the electrical capacitance in the tip of the electronic pointing device.

The following figures are an example:

1 : Exemplary system for digital inputs

2 : Exemplary electronic circuit component

The 1 shows an exemplary system 100 to carry out and record entries 107 by means of an exemplary electronic pointing device 101 on a digital input device 102 with electrically capacitive touch-sensitive input surface / electrically capacitive touchpad 108 ,

The electronic pointing device 101 can also have an electrically conductive lead, the top 104 from the, also electrically conductive executable, end part 105 can escape.

The electronic pointing device 101 can electrically capacitive to an electrical measurement signal of the touchpad 108 coupled and, for example, over the top 104 an electrical measurement signal of the touchpad 108 of the digital input device 102 take up.

The summit 104 of the electronic pointing device 101 may be part of an electronic circuit component according to the invention, or be electrically connected to an electronic circuit component according to the invention (not shown).

Advantageously (not shown) can, except for example, a digital control unit, microcontroller, and / or a local power supply of the electronic circuit component, the parts of the electronic circuit component as close to the pointing device tip are arranged and have an electrical shield.

For advantageous ergonomic weight distribution, however, a digital control unit, microcontroller, and / or a local power supply can be arranged further away from the pointing device tip.

In addition, optional, the digital input device 102 further configured to provide a control signal to the electronic pointing device 101 to send, wherein the control signal information about the signal strength of the electronic pointing device on the touchpad 108 triggered electrical measurement signal to determine a position on the touchpad 108 may include.

For this purpose, the digital input device 102 For example, at least one speaker 109 have which control signals to the electronic pointing device 101 transmitted by sound, eg by ultrasound.

To receive from the digital input device 102 emitted control signals, the electronic pointing device 101 for example, at least one microphone 103 exhibit.

For example, the microphone 103 for receiving the control signals below a handle part 106 in an end part 105 of the electronic pointing device 101 be housed.

It is also conceivable, for example, the microphone for receiving the control signals at the top 104 opposite end of the electronic pointing device 101 To accommodate advantageously to be able to prevent the microphone is covered by the writing hand of the user.

Optionally, the electronic pointing device 101 while the electrical capacity of the top 104 of the electronic pointing device 101 modulate in response to the received control signal to determine the position of a contact point on the touchpad 108 ,

Other wireless communication links between digital input device 102 and electronic pointing device 101 for transmitting control signals from the digital input advisor 102 to the electronic pointing device 101 , as. eg via Bluetooth, Bluetooth Low Energy / Bluetooth Smart or WLAN, however, are also conceivable.

Thus, for example, the capacity behavior of the electronic pointing device 101 even better on the capacity behavior or the capacitance sensitivity of the touchpad 108 be adjusted.

The 2 shows an example of a possible embodiment of an electronic circuit component 200 , or an electronic circuit, for use in an electronic pointing device, such as a pointing device 101 which can be carried out as follows and can be operated as follows.

The touchpad of a digital input device (not shown) may, as mentioned, generate an electrical measurement signal, e.g. a sequence of AC pulses.

If, for example, the tip 201 an electronic pointing device is placed on the touch panel, a small capacitive displacement current can flow via an electrically capacitive coupling between the touchpad and tip.

This displacement current can be via an optional (first) capacitor 202 , which can serve as protection against DC components when touching the tip with touchpad, for example, and optionally via another capacitor 203 to a local ground potential of an input component, for example to a local ground potential 211 a voltage-current transformer 204 flow.

The voltage-current transformer 204 can have its own local power supply or local voltage source.

The voltage-current transformer 204 In addition, it can also contain an impedance converter as well as several outputs, for example a current output and optionally a voltage output.

The current at an output, eg at the current output, of the voltage-current transformer 204 can be used as an image of the voltage drop across the capacitor 203 be understood. Since the existing contact between the tip and touchpad capacity, for example, referred to as contact capacitance, with the capacitor 203 can form a capacitive voltage divider, the voltage at the input of the voltage-current converter 204 and thus the current at its current output in phase to the electrical measurement signal of the touchpad, or in phase to a measurement voltage of the touchpad, be.

The current at the current output of the voltage-current transformer 204 can about the resistance 205 in a voltage relative to the system ground 210 be implemented. This voltage can be through the amplifier 207 be strengthened and in the local ground potential 211 of the voltage-current transformer 204 be fed. In this case, the effective gain and the polarity of the gain, for example via a control signal 213 from a digital control unit, eg microcontroller 208 , suitably adjusted and regulated.

This exemplary design of an electronic circuit component 200 an electronic pointing device allows, for example, the following operating options.

The gain of the amplifier 207 can from the microcontroller 208 via the control signal 213 be adjusted so that the voltage at the local ground 211 opposite the voltage across the capacitor 203 is in antiphase.

For example, this results in a shift current in the pointing device tip 201 to a decrease in the voltage at the local ground 211 leads, which leads to an amplification of the displacement current.

This leads, for example, to an increase in the current at the output of the voltage-current converter 204 ie the electronic circuit component 200 is therefore linked.

The local crowd 211 can be independent of the system mass 210 be. The voltage-current transformer 204 can therefore have an independent power supply 209 feature.

The increase in the displacement current affects the touchpad as an increased capacity.

The countervoltage can preferably be set so high that the touchpad detects a sufficiently high capacitance so that a touch of the touchpad can be detected by the tip of the pointing device.

The degree of positive feedback can be determined by the contact capacitance between the touchpad and the tip 201 be dependent.

In this case, the positive feedback can increase so much that the electrical capacitive coupled system starts to vibrate.

That's why the microcontroller 208 , eg via an amplitude measurement 206 , eg performed between diode 215 and capacitor 216 that measure and monitor reverse voltage.

The microcontroller 208 can gain via a control signal 213 set so that on the one hand a sufficiently high counter voltage can be generated, but on the other hand, an unwanted electrical swinging can be avoided.

The magnitude of the displacement current may depend on the effective capacitance, ie the area of contact of the tip 201 , be dependent. A higher capacity can lead to an increased displacement current.

Since the reverse voltage can also increase the displacement current, the circuit may start to oscillate at too high a gain.

On the other hand, however, the counter tension should be as high as possible in order to ensure a good function.

For example, to allow a permanently reliable operation, it is preferable to adjust and correct the gain during operation.

These functions can be, for example, the microcontroller 208 take. It can measure the reverse voltage and, for example, set it to the maximum permissible value at which no oscillation still occurs.

This can be done by the microcontroller 208 Measure the maximum and minimum reverse voltage.

In operation, for example, if the setting is correct, a countervoltage will only occur if the touchpad is currently carrying voltage. In the possible breaks of the measuring voltage of the touchpad no counter voltage. This may be the microcontroller 208 evaluate and adjust the gain so that the maximum reverse voltage reaches a value at which no significant distortion occurs. In addition, the microcontroller 208 Make sure that during the breaks no tension and thus no swinging occurs.

Via a control signal 212 to control and regulate the modulation of the electrical capacitance or the electrically effective capacitance in the tip of the electronic pointing device, and possibly for example with the use of a switch 214 , The microcontroller can modulate the generation of the back voltage and lock, for example.

A blockage can, for example, lead to a reduction in capacity below the detection threshold of the touchpad.

It can be achieved, for example, that the touchpad alternately detects a touch and does not recognize. This may advantageously allow to distinguish the pointing device tip from the hand of the user.

As the microcontroller 208 eg via the amplitude measurement 206 In this case, it is also possible to carry out the modulation of the reverse voltage, or the modulation of the electrical capacitance or the electrically effective capacitance in the tip of the electronic pointing device, synchronously with the measuring cycles of the touchpad.

This allows, for example, unique patterns, e.g. 3 measuring cycles active, 2 measuring cycles inactive, which can be clearly recognized by the evaluation electronics of the digital input device.

In this mode, for example, the electronic circuit component 200 a current controlled negative impedance converter, wherein a positive current at the peak 201 to a negative voltage at the top 201 leads and vice versa.

This voltage change can cause an increase in the peak 201 lead flowing electricity.

According to the voltage gain of the circuit 200 Thus, the effective capacity between touchpad and tip can increase. This ensures that even very thin pointing device tips, eg with mean diameters smaller than 3 mm, can be detected by the touchpad.

However, it is also the following operation of the electronic circuit component 200 conceivable.

For example, by applying a positive voltage, the capacitance of the tip can be reduced, so that a modulation of the capacitance is also possible here.

Thus, for example, even with touch panels that are so sensitive that no increase in the capacity of the tip of the pointing device is required because the intrinsic output capacitance of the tip is already sufficient to trigger a touch signal, a distinction between hand and tip possible.

Via the optional voltage output of the voltage-current transformer 204 or Impedanzwandlers example, the voltage applied to the voltage-current transformer / impedance converter input voltage, or an image of the voltage at the top of the electronic pointing device, for example via a connection 217 , directly to the amplifier 207 be supplied.

This can reduce the circuit complexity and it can be dispensed with stabilization measures to suppress unwanted electrical vibrations in this case. In contrast to the method described above, in this case, the voltage that the amplifier 207 thus feeds in phase to the voltage across the capacitor 203 or in phase to the voltage at the voltage output of the voltage-current converter 204 , or be in phase with the input voltage, for example.

A stream in the top 201 flows, then can increase the voltage at the local ground 211 to lead. This can affect the capacity of the pointing device tip. With a sufficiently high gain, the capacitance of the tip can then fall below the detection threshold of the touchpad.

For example, even a system gain of just under 1 can allow a sufficient reduction in the capacity of the pointing device tip.

In addition, for example, via the controller 213 the reinforcement 213 but also a high, non-inverting gain selectable.

For an advantageous universal use of the electronic pointing device, with practical independence of the capacitive sensitivity with which a touchpad can register touches, the electronic circuit component can switch between the described modes of operation, i. can optionally and automatically switch between a modulation with a capacitance increased capacity compared to a predetermined capacity (use case 1), and a modulation with respect to a predetermined capacity value of reduced capacity (use case 2).

Comparatively insensitive touch fields according to use case 1 can e.g. reliably detect the increased capacity due to the counter voltage. Although reduced by a Mitspann voltage capacity would not be required but would certainly be recognized as "not touched".

Comparatively sensitive touch fields after use case 2, for example, would already detect the normal contact without reverse voltage, but the increased by the reverse voltage capacity does not interfere. On the other hand, the case "not touched" would be able to be recognized by the reduced capacitance due to the reduced voltage.

This is followed by 2 sheets with 2 figures.

The reference numerals are assigned as follows.

LIST OF REFERENCE NUMBERS

100

System for carrying out and recording inputs on a digital input device with an electrically capacitive touch-sensitive input surface / electrically capacitive touchpad

101

Electronic pointing device

102

Digital input device

103

microphone

104

Tip of the electronic pointing device

105

End part of the electronic pointing device

106

Handle part of the electronic pointing device

107

Input on input surface / touchpad

108

Electrically capacitive touchpad

109

speaker

200

Electronic Circuit Component / Electronic Circuit

201

Tip of the electronic pointing device

202

(first) capacitor, e.g. as a protective capacitor against DC components in contact of the tip of the electronic pointing device with the touchpad

203

(second) capacitor

204

Input component, voltage-current converter, may optionally also include an impedance converter

205

(first) resistance

206

amplitude measurement

207

amplifier

208

Digital control unit, e.g. microcontroller

209

(local) voltage source

210

system ground

211

local mass

212

Modulation / connection of the digital control unit, e.g. Microcontroller, to the amplifier or e.g. Connecting the digital control unit to a switch, for controlling the modulation of the electrical capacitance or the electrically effective capacitance in the tip of the electronic pointing device / control signal for controlling the modulation of the electrical capacitance or the electrically effective capacitance in the top of electronic pointing device

213

Amplification / connection of the digital control unit, eg microcontroller, for Amplifier for controlling and regulating the amplifier / control signal for controlling and regulating the amplifier

214

Switch, e.g. controlled by the digital control unit, e.g. Microcontroller, for controlling and regulating the modulation of the electrical capacitance or the electrically effective capacitance in the tip of the electronic pointing device

215

Diode / rectifier

216

(third) capacitor

217

Connection between component 204 and switches 214

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 7612767 B1 [0005]

Claims (11)

Electronic pointing device ( 101 ) for the input ( 107 ) on a digital input device ( 102 ) with electrically capacitive touchpad ( 108 ), wherein the electronic pointing device electrically capacitively to an electrical measurement signal of the touchpad ( 108 ), characterized in that the electronic pointing device ( 101 ) at least one electronic circuit component ( 200 ) configured to increase the electrical capacitance in the tip ( 104 ) of the electronic pointing device ( 101 ) to modulate. Electronic pointing device ( 101 ) according to claim 1, wherein the electronic circuit component ( 200 ) is further configured to modulate the electrical capacitance of the tip ( 104 ) of the electronic pointing device ( 101 ) in which between at least two capacitance states of the tip ( 104 ) and wherein at least one capacity state assumes a capacitance value which is below a predetermined capacitance value, for example below a capacitance detection threshold value of the touchpad ( 108 ) of a digital input device ( 102 ), lies. Electronic pointing device ( 101 ) according to claim 1, wherein the electronic circuit component ( 200 ) is further configured to modulate the electrical capacitance of the tip ( 104 ) of the electronic pointing device ( 101 ) in which between at least two capacitance states of the tip ( 104 ) and wherein at least one capacity state assumes a capacitance value which is equal to or greater than a predetermined capacitance value, for example a capacitance detection threshold value of the touchpad ( 108 ) of a digital input device ( 102 ) is. Electronic pointing device ( 101 ) according to claim 1, wherein the electronic circuit component ( 200 ) is further configured to modulate the electrical capacitance of the tip ( 104 ) of the electronic pointing device ( 101 ) in which between at least two capacitance states of the tip ( 104 ) and wherein at least one capacity state assumes a capacitance value which is below a predetermined capacitance value, for example below a capacitance detection threshold value of the touchpad ( 108 ) of a digital input device ( 102 ), wherein at least one capacitance state assumes a capacitance value which is equal to or greater than a predefined capacitance value, for example a capacitance detection threshold value of the touchpad ( 108 ) of a digital input device ( 102 ) is. Electronic pointing device ( 101 ) according to one of the preceding claims, wherein the electronic circuit component ( 200 ) is further configured to perform a modulation of a sequence of capacitive state changes such that capacitance states are changed individually or in groups. Electronic pointing device ( 101 ) according to one of the preceding claims, wherein the electronic circuit component ( 200 ) is designed as a current-controlled negative impedance converter. Electronic pointing device ( 101 ) according to one of the preceding claims, wherein the electronic circuit component ( 200 ) is configured to adjust the amount of a modulation of the electrical capacitance of the tip ( 104 ) to limit the counter voltage generated by the electronic pointing device to a maximum value, in order to avoid unwanted electrical oscillations of the electrically capacitive coupling between the pointing device ( 101 ) and touchpad ( 108 ). Electronic pointing device ( 101 ) according to one of the preceding claims, wherein the electronic circuit component ( 200 ) is further configured to control the modulation of the electrical capacitance in the tip ( 104 ) of the electronic pointing device ( 101 ) synchronously with a measuring frequency of the digital input device ( 102 ) with the contact position determining sensors of the touchpad ( 108 ), eg electrodes, are queried. Electronic pointing device ( 101 ) according to one of the preceding claims, wherein the area of the tip ( 104 ) of the electronic pointing device with which a contact with the touchpad ( 108 ), has mean diameters smaller than 3 mm Method for making entries on a digital input device ( 102 ) with electrically capacitive touchpad ( 108 ) by means of an electronic pointing device ( 101 ), comprising: recording an electrical measurement signal of the touchpad ( 108 ) on the electronic pointing device ( 101 ), Modulation of electrical capacitance in the tip ( 104 ) of the electronic pointing device ( 101 ). System ( 100 ) for making and recording inputs on a digital input device ( 102 ) with electrically capacitive touchpad ( 108 ), comprising: a digital input device ( 102 ) with electrically capacitive touchpad ( 108 ), an electronic pointing device ( 101 ) for the input ( 107 ) on said digital input device ( 102 ), whereby the electronic pointing device ( 101 ) electrically capacitively to an electrical measurement signal of the touchpad ( 108 ) is coupled, as well as the electronic Pointing device ( 101 . 200 ) is configured to generate an electrical measurement signal of the touchpad ( 108 ) and the electronic pointing device ( 101 ) at least one electronic circuit component ( 200 ) configured to increase the electrical capacitance in the tip ( 104 ) of the electronic pointing device ( 101 ) to modulate.

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