CN214427627U - Pen lifting detection device, writing pen and interactive tablet device - Google Patents
Pen lifting detection device, writing pen and interactive tablet device Download PDFInfo
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- CN214427627U CN214427627U CN202120366564.2U CN202120366564U CN214427627U CN 214427627 U CN214427627 U CN 214427627U CN 202120366564 U CN202120366564 U CN 202120366564U CN 214427627 U CN214427627 U CN 214427627U
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Abstract
The application relates to a pen lifting detection device, a writing pen and an interactive tablet device. Wherein, the pen lifting detection device comprises a light intensity sensor; the magnetic piece is arranged on the writing pen; an optical path component; the light path component projects light with corresponding light intensity to the light intensity sensor according to the change of the magnetic field of the magnetic piece; the light intensity sensor receives the light projected by the light path component and outputs corresponding electric signals outwards. The optical assembly of the pen lifting detection device can emit light with different light intensities according to the magnetic field change generated by the magnetic part in the writing pen, and whether the writing pen is lifted or not can be confirmed according to the electric signal generated by the received light through the light intensity sensor, so that pen lifting detection is realized. Through the pen lifting detection equipment, the power consumption of the pen lifting detection equipment is mainly consumed on the light source and the light intensity sensor, and the pen lifting detection equipment has the characteristic of low power consumption. Meanwhile, compared with a traditional circuit which needs to identify the direction of the magnetic field, the detection principle of the magnetic field sensor is higher in accuracy.
Description
Technical Field
The application relates to the technical field of pen lifting detection, in particular to pen lifting detection equipment, a writing pen and interactive tablet equipment.
Background
With the continuous development of the field of human-computer interaction, human-computer interaction devices are more and more widely applied in recent years. The writing pen is used as an important component in human-computer interaction and is often used in cooperation with a display panel in the interaction device.
In the implementation process, the inventor finds that at least the following problems exist in the conventional technology: the traditional technical scheme for pen lifting detection has the problems of high power consumption, low precision and the like.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a pen lifting detection device, a writing pen and an interactive tablet device which can achieve low power consumption and high accuracy.
In order to achieve the above object, in one aspect, the embodiment of the present invention provides a pen lifting detection device, which includes a light intensity sensor;
the magnetic piece is arranged on the writing pen;
an optical path component; the light path component projects light with corresponding light intensity to the light intensity sensor according to the change of the magnetic field of the magnetic piece;
the light intensity sensor receives the light projected by the light path component and outputs corresponding electric signals outwards.
In one embodiment, the optical path component comprises a light source, a polarizer, a magneto-optical material and an analyzer;
the polarizer is arranged on one side of the magneto-optical material; the analyzer is arranged on the other side of the magneto-optical material; the light source is arranged on one side of the polarizer far away from the magneto-optical material; the light intensity sensor receives light projected from the analyzer.
In one embodiment, the polarization direction of the analyzer is perpendicular or parallel to the polarization direction of the polarizer.
In one embodiment, the system further comprises a controller;
the controller is connected with the light intensity sensor.
In one embodiment, the device further comprises an ADC sampling device;
the controller is connected with the light intensity sensor through the ADC sampling device.
In one embodiment, the controller is a main control chip of the interactive tablet device.
In one embodiment, the magnetic member is a magnet.
In one aspect, an embodiment of the present invention provides a writing pen, including the pen lifting detection device as described in any one above.
On the other hand, the embodiment of the utility model provides an mutual dull and stereotyped equipment, including dull and stereotyped body, write the pen to and as above-mentioned arbitrary one carry a check out test set.
In one embodiment, the light path component is arranged on the flat plate body.
One of the above technical solutions has the following advantages and beneficial effects:
the optical assembly of the pen lifting detection device can emit light with different light intensities according to the magnetic field change generated by the magnetic part in the writing pen, and whether the writing pen is lifted or not can be confirmed according to the electric signal generated by the received light through the light intensity sensor, so that pen lifting detection is realized. Through the pen lifting detection equipment, the power consumption of the pen lifting detection equipment is mainly consumed on the light source and the light intensity sensor, and the pen lifting detection equipment has the characteristic of low power consumption. Meanwhile, compared with a traditional circuit which needs to identify the direction of the magnetic field, the detection principle of the magnetic field sensor is higher in accuracy.
Drawings
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular description of preferred embodiments of the application, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual dimensions, emphasis instead being placed upon illustrating the subject matter of the present application.
FIG. 1 is a first schematic block diagram of a pen detection apparatus according to an embodiment;
FIG. 2 is a second schematic block diagram of a pen detection apparatus according to an embodiment;
FIG. 3 is a schematic diagram of the Faraday rotation effect in one embodiment;
FIG. 4 is a third schematic block diagram of a pen detection apparatus according to an embodiment;
FIG. 5 is a fourth schematic block diagram of a pen detection apparatus according to an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
At present, the existing technical schemes for pen lifting detection generally have two types: firstly, a magnet is arranged on a writing pen and then is adsorbed on a machine shell, and the way can achieve the function of pen detection without being placed everywhere because no redundant design is made on a circuit; secondly, a pen lifting detection device based on a Hall sensor is adopted, the Hall sensor is added to a machine in the mode, a magnetic field is added to the Hall sensor through a magnet on a writing pen, the Hall sensor can output different voltages according to the difference of the external magnetic field, the design of identifying the direction of the magnetic field needs to be added to a circuit, and the cost and the precision are high.
The pen lifting detection device provided by the application can effectively solve the problems.
In one embodiment, as shown in fig. 1, there is provided a pen lifting detection apparatus comprising:
a light intensity sensor;
the magnetic piece is arranged on the writing pen;
an optical path component; the light path component projects light with corresponding light intensity to the light intensity sensor according to the change of the magnetic field of the magnetic piece; the light intensity sensor receives the light projected by the light path component and outputs corresponding electric signals outwards.
The light intensity sensor is used for converting the illumination intensity into an electric signal; the magnetic member may be any element capable of generating a magnetic field in the art, and in one embodiment, the magnetic member is a magnet; the optical path member may be any one of those in the art that can change the intensity of the projection light according to a change in the magnetic field.
Specifically, the magnetic part is arranged on the writing pen, and the writing pen can be adsorbed on the preset position through the magnetism of the magnetic part. Wherein, the preset position can be a fixed position of a metal shell of the electronic device. When the writing pen needs to be used, the writing pen is taken down. At this time, the magnetic member disposed on the writing pen changes in position, which causes the light path component to change under the influence of the magnetic field, and causes the light intensity of the light projected to the light intensity sensor to change. The light intensity sensor receives the light projected by the light path component and outputs an electric signal corresponding to the light intensity to the outside. The change of the light intensity can be judged according to the change of the electric signal, so that whether the writing pen is lifted or not is obtained. Further, it can be found that the light intensity is increased or decreased when the writing pen is lifted according to the components of the actual light path component. For example: the actual composition of the optical path components determines that the intensity of light is increased when the pen is lifted, and that the pen is lifted when the voltage of the electrical signal becomes large.
The optical assembly of the pen lifting detection device can emit light with different light intensities according to the magnetic field change generated by the magnetic part in the writing pen, and whether the writing pen is lifted or not can be confirmed according to the electric signal generated by the received light through the light intensity sensor, so that pen lifting detection is realized. Through the pen lifting detection equipment, the power consumption of the pen lifting detection equipment is mainly consumed on the light source and the light intensity sensor, and the pen lifting detection equipment has the characteristic of low power consumption. Meanwhile, compared with a traditional circuit which needs to identify the direction of the magnetic field, the detection principle of the magnetic field sensor is higher in accuracy.
In one embodiment, as shown in fig. 2, there is provided a pen lifting detection apparatus, including:
a light intensity sensor;
the magnetic piece is arranged on the writing pen;
an optical path component; the light path component projects light with corresponding light intensity to the light intensity sensor according to the change of the magnetic field of the magnetic piece; the light intensity sensor receives the light projected by the light path component and outputs corresponding electric signals outwards.
Wherein, the light path component comprises a light source 10, a polarizer 20, a magneto-optical material 30 and an analyzer 40;
the polarizer is arranged on one side of the magneto-optical material; the analyzer is arranged on the other side of the magneto-optical material; the light source is arranged on one side of the polarizer far away from the magneto-optical material; the light intensity sensor receives light projected from the analyzer.
The light source can be any one of the light sources in the field, the polarizer is used for being matched with the light source to generate polarized light, and the magneto-optical material is used for changing the polarization direction of the polarized light under the influence of a magnetic field. The analyzer consists of a polarizer, and when the polarization direction of the polarized light is completely perpendicular to the direction of the analyzer, the light cannot pass through the analyzer.
Specifically, according to the faraday rotation effect: when linearly polarized light propagates in a medium, if a magnetic field parallel to the light propagation direction is applied, the polarization direction of the light is changed, and the relationship between the deflection angle and the applied magnetic field is as follows:
θ＝VBL
wherein, V is a Verdet constant which represents the magneto-optical property of the substance, and V values of different materials are different; b is the external magnetic field intensity; l is the length of the medium through which the light passes, i.e. the length of the magneto-optical material; the schematic diagram is shown in fig. 3.
It should be noted that the polarization directions of the analyzer and the polarizer may be parallel or perpendicular. In a specific example, when the polarization directions of the analyzer and the polarizer are parallel, the polarization direction of the polarized light passing through the polarizer is changed under the influence of the magnetic field, so that the light intensity of the light passing through the analyzer is reduced. When the writing pen is lifted, the Faraday rotation effect is weakened or disappears, so that the light intensity received by the light intensity sensor is enhanced, and the value of the electric signal is increased. In another specific example, when the polarization directions of the analyzer and the polarizer are perpendicular, under the influence of a magnetic field, the polarization direction of the polarized light passing through the polarizer is changed, so that the light intensity of the light passing through the analyzer is increased, and when the writing pen is lifted, the faraday rotation effect is weakened or disappeared, so that the light intensity received by the light intensity sensor is weakened, the value of the electric signal is reduced, in other words, the change of the magnetic field causes the change of the polarization angle of the linearly polarized light passing through the magneto-optical material, and when the linearly polarized light with the changed angle passes through the analyzer, the light intensity passing through the analyzer is reduced because the polarization angle of the linearly polarized light is different from the polarization angle of the analyzer. Whether the writing pen is in the lifted state or not can be obtained through the change of the value of the electric signal and the specific setting state of the optical path component. In one embodiment, the polarization direction of the analyzer is perpendicular to the polarization direction of the polarizer.
The pen lifting detection equipment realizes pen lifting detection by utilizing Faraday rotation effect, and is simple in structure and easy to popularize.
In one embodiment, as shown in fig. 4, there is provided a pen lifting detection apparatus including:
a light intensity sensor;
the magnetic piece is arranged on the writing pen;
an optical path component; the light path component projects light with corresponding light intensity to the light intensity sensor according to the change of the magnetic field of the magnetic piece; the light intensity sensor receives the light projected by the light path component and outputs corresponding electric signals outwards.
The optical path component comprises a light source, a polarizer, a magneto-optical material and an analyzer;
the polarizer is arranged on one side of the magneto-optical material; the analyzer is arranged on the other side of the magneto-optical material; the light source is arranged on one side of the polarizer far away from the magneto-optical material; the light intensity sensor receives light projected from the analyzer.
The device also comprises a controller;
the controller is connected with the light intensity sensor.
The type of the controller is not limited, and may be set according to an actual application, for example, the controller may be a general Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc., as long as it can receive the electrical signal of the light intensity sensor and confirm whether to lift the pen according to the voltage signal.
Specifically, under the condition that the polarization directions of the polarizer and the analyzer are parallel, when the writing pen is lifted, the Faraday rotation effect is weakened or disappears, so that the light intensity received by the light intensity sensor is enhanced, and the value of the electric signal is increased. That is, when the value of the electric signal becomes large, it is confirmed that the writing pen is lifted.
Under the condition that the polarization directions of the polarizer and the analyzer are vertical, when the writing pen is lifted, the Faraday rotation effect is weakened or disappears, so that the light intensity received by the light intensity sensor is weakened, and the value of the electric signal is reduced. That is, in the case where the value of the electric signal decreases, it is confirmed that the writing pen is lifted.
In one embodiment, as shown in fig. 5, there is provided a pen lifting detection apparatus including:
a light intensity sensor;
the magnetic piece is arranged on the writing pen;
an optical path component; the light path component projects light with corresponding light intensity to the light intensity sensor according to the change of the magnetic field of the magnetic piece; the light intensity sensor receives the light projected by the light path component and outputs corresponding electric signals outwards.
The optical path component comprises a light source, a polarizer, a magneto-optical material and an analyzer;
the polarizer is arranged on one side of the magneto-optical material; the analyzer is arranged on the other side of the magneto-optical material; the light source is arranged on one side of the polarizer far away from the magneto-optical material; the light intensity sensor receives light projected from the analyzer.
The device also comprises a controller;
the controller is connected with the light intensity sensor.
The device also comprises ADC sampling equipment;
the controller is connected with the light intensity sensor through the ADC sampling device.
The ADC sampling device may be any circuit with a voltage sampling function in the field.
Specifically, the signal of the light intensity sensor is sampled by the ADC sampling device and transmitted to the processor.
In one embodiment, the controller is a main control chip of the interactive tablet device.
Specifically, the main control chip of the tablet device can be directly interacted with the electrical signal output value, so that the interactive tablet device can respond to the pen lifting correspondingly.
In one embodiment, a writing pen is provided, comprising a pen-lift detection device as in any one of the above.
In particular, the writing pen may be any form of writing pen. In one particular example, the pen-up detection device may include a light intensity sensor; the magnetic piece is arranged on the writing pen; an optical path component; the light path component projects light with corresponding light intensity to the light intensity sensor according to the change of the magnetic field of the magnetic piece; the light intensity sensor receives the light projected by the light path component and outputs corresponding electric signals outwards.
In one embodiment, an interactive tablet device is provided, comprising a tablet body, a writing pen, and a pen-up detection device as in any one of the above.
The tablet body is provided with a metal shell, and the writing pen is internally provided with a magnetic part which can be adsorbed on the tablet body. In one particular example, the pen-up detection device may include a light intensity sensor; the magnetic piece is arranged on the writing pen; an optical path component; the light path component projects light with corresponding light intensity to the light intensity sensor according to the change of the magnetic field of the magnetic piece; the light intensity sensor receives the light projected by the light path component and outputs corresponding electric signals outwards.
In one embodiment, the light path component is arranged on the flat plate body.
Specifically, the light path component is arranged on the flat plate body, and when the writing pen leaves the flat plate body, the light path component is also far away. The magnetic field to which the optical path component is subjected varies.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A pen lifting detection device, comprising:
a light intensity sensor;
the magnetic piece is arranged on the writing pen;
an optical path component; the light path component projects light with corresponding light intensity to the light intensity sensor according to the change of the magnetic field of the magnetic piece; the light intensity sensor receives the light projected by the light path component and outputs corresponding electric signals outwards.
2. The pen lifting detection apparatus of claim 1, wherein the optical path component comprises a light source, a polarizer, a magneto-optical material, and an analyzer;
the polarizer is arranged on one side of the magneto-optical material; the analyzer is arranged on the other side of the magneto-optical material; the light source is arranged on one side of the polarizer, which is far away from the magneto-optical material; the light intensity sensor receives light projected from the analyzer.
3. The pen lifting detection apparatus according to claim 2, wherein the polarization direction of the analyzer is perpendicular or parallel to the polarization direction of the polarizer.
4. The pen lifting detection device of claim 1, further comprising a controller;
the controller is connected with the light intensity sensor.
5. The pen lifting detection device of claim 4, further comprising an ADC sampling device;
the controller is connected with the light intensity sensor through the ADC sampling equipment.
6. The pen lifting detection device of claim 4 or 5, wherein the controller is a main control chip of the interactive tablet device.
7. The pen lifting detection apparatus of claim 1, wherein the magnetic member is a magnet.
8. A writing pen comprising the pen lifting detection device according to any one of claims 1 to 7.
9. An interactive tablet device comprising a tablet body, a writing pen, and a pen-up detection device as claimed in any one of claims 1 to 7.
10. The interactive tablet device of claim 9, wherein the light path component is disposed on the tablet body.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120366564.2U CN214427627U (en) | 2021-02-08 | 2021-02-08 | Pen lifting detection device, writing pen and interactive tablet device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120366564.2U CN214427627U (en) | 2021-02-08 | 2021-02-08 | Pen lifting detection device, writing pen and interactive tablet device |
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| CN214427627U true CN214427627U (en) | 2021-10-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114690250A (en) * | 2022-06-01 | 2022-07-01 | 广州市保伦电子有限公司 | Detection method of lifting pen based on pure magnetic induction |
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2021
- 2021-02-08 CN CN202120366564.2U patent/CN214427627U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114690250A (en) * | 2022-06-01 | 2022-07-01 | 广州市保伦电子有限公司 | Detection method of lifting pen based on pure magnetic induction |
| CN114690250B (en) * | 2022-06-01 | 2022-08-12 | 广州市保伦电子有限公司 | Detection method of lifting pen based on pure magnetic induction |
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