CN107131959B - Inductor - Google Patents

Abstract

The invention relates to a sensor, which includes a focusing lens and a sensing chip; the focusing lens has a plurality of focusing areas, and the focusing areas are used to focus incident thermal radiation and infrared radiation signals and emit them onto the sensing chip; The induction chip is used to receive thermal radiation and infrared radiation signals, and send out induction signals when the thermal radiation and infrared radiation signals are within a preset radiation range; the sensor also includes a sensor disposed between the focusing lens and the induction chip. The liquid crystal module includes a liquid crystal cell and a matrix drive circuit. The liquid crystal cell has a plurality of liquid crystal areas corresponding to the focus areas of the focusing lens. The matrix drive circuit is used to drive all the focus areas of the focusing lens. The plurality of liquid crystal areas of the liquid crystal cell are opened one by one, and thermal radiation and infrared radiation signals can pass through the liquid crystal areas when they are opened. The above-mentioned sensor can not only detect the thermal radiator and infrared radiator entering the sensing range, but also determine the location range of the thermal radiator and infrared radiator.

Description

sensor

Technical field

The present invention relates to the field of sensing technology, and in particular to a sensor.

Background technique

The principle of traditional sensors is mainly to detect radiation signals through induction chips to determine whether there is a human body or other targets within the sensing range. Since the sensing range of the sensing chip is small, usually within tens of centimeters, currently common sensors are also equipped with a Fresnel lens. As shown in Figure 1, the Fresnel lens 11 generally includes multiple non-overlapping focusing lenses. Area, different focusing areas can focus the radiation signals in different sensing areas to the sensing chip 12, thereby expanding the sensing range.

Although the sensing range can be expanded through the Fresnel lens, the sensor chip can only sense the presence of radiation signals within the sensing range and cannot determine the source of the radiation signal. Therefore, traditional sensors cannot detect the specific location of the target person/object. , resulting in a relatively single function of the sensor and a narrow application area, making it unsuitable for some occasions that require sensing target positions.

Contents of the invention

Based on this, it is necessary to provide a sensor that can detect thermal radiators and infrared radiators entering the sensing range and simultaneously determine the thermal radiators and infrared radiation in order to address the shortcomings of existing sensors that cannot detect the position of the human body and have a single function. The location range of the body.

A sensor including a focusing lens and a sensing chip;

The focusing lens has multiple focusing areas, and the focusing areas are used to focus and emit incident thermal radiation and infrared radiation signals onto the sensing chip;

The induction chip is used to receive thermal radiation and infrared radiation signals, and send out induction signals when the thermal radiation and infrared radiation signals are within a preset radiation range; characterized in that the sensor also includes a sensor provided on the focusing lens and the the liquid crystal module between the sensing chips;

The liquid crystal module includes a liquid crystal cell and a matrix drive circuit, the liquid crystal cell having a plurality of liquid crystal areas corresponding to the plurality of focus areas of the focusing lens;

The matrix driving circuit is used to drive the plurality of liquid crystal areas of the liquid crystal box to be opened one by one. When the liquid crystal areas are opened, thermal radiation and infrared radiation signals can pass through.

In one embodiment, the sensor further includes a logic circuit, the logic circuit is connected to the matrix driving circuit and the sensing chip respectively, and the logic circuit is used to receive the current on signal from the matrix driving circuit in real time. identification information of the liquid crystal area, and receive the induction signal sent by the induction chip;

The logic circuit is also used to establish a corresponding relationship between the synchronized sensing signal and the identification information.

In one embodiment, the sensor further includes a processor configured to receive correspondence information between the sensing signal and the identification information and additionally receive time information;

The processor is further configured to generate a first control signal when there is at least two corresponding relationship information between the sensing signal and the identification information within a preset time range.

In one embodiment, the sensor further includes a processor configured to receive correspondence information between the sensing signal and the identification information and additionally receive time information;

The processor is also preset with the identification information list and its adjacent relationship;

The processor is also configured to determine whether two consecutive pieces of identification information satisfy the requirements of the corresponding identification information based on the two consecutively received sensing signals and their corresponding identification information, the identification information list and their adjacent relationship. neighbor relationship, and when the neighbor relationship is satisfied, a second control signal is generated.

In one embodiment, the sensor further includes a processor configured to receive correspondence information between the sensing signal and the identification information and additionally receive time information;

The processor is also configured to determine whether there are at least two sensing signals based on at least three sensing signals continuously received every at least a preset time period and their corresponding identification information, the identification information list and their adjacent relationships. The continuous identification information satisfies the adjacent relationship, and it is determined whether there is duplicate identification information. When the adjacent relationship is satisfied and there is duplicate identification information, a third control signal is generated.

In one embodiment, the distance between the liquid crystal module and the focusing lens is 0.05cm˜2cm.

In one embodiment, the sensor further includes a secondary lens disposed between the liquid crystal module and the sensing chip. The secondary lens is used to focus and emit incident thermal radiation and infrared radiation signals. onto the sensor chip.

In one embodiment, the focusing lens and the secondary lens are Fresnel lenses.

In one embodiment, the sensing chip is a pyroelectric sensing chip.

In one embodiment, the sensing chip is a temperature sensing chip.

The above-mentioned sensor controls each liquid crystal area of the liquid crystal box to open one by one, so that the induction chip receives thermal radiation and infrared radiation signals in different sensing areas in a certain order, thereby determining whether there are preset thermal radiators and infrared radiation in each sensing area. Infrared radiator, and then determine the location range of the thermal radiator and infrared radiator, making the function of the sensor more diversified and its application wider.

Description of drawings

Figure 1 is a schematic structural diagram of a traditional sensor;

Figure 2 is a schematic structural diagram of a sensor according to an embodiment of the present invention;

Figure 3 is a schematic structural diagram of a sensor according to another embodiment of the present invention;

Figure 4 is a schematic diagram of the circuit module of the sensor according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a circuit module of an inductor according to another embodiment of the present invention.

Detailed ways

In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough understanding of the present disclosure will be provided.

As shown in FIG. 2 , it is a schematic structural diagram of a sensor 20 according to an embodiment of the present invention. The sensor 20 includes a focusing lens 21 , a liquid crystal module 22 and a sensing chip 23 , wherein the liquid crystal module 22 is disposed between the focusing lens 21 and the sensing chip 23 .

The focusing lens 21 has multiple focusing areas, and the focusing areas are used to focus the incident thermal radiation and infrared radiation signals and emit them onto the sensing chip 23 . For example, multiple focusing areas of the focusing lens 21 respectively correspond to different sensing areas, and the focusing areas are used to focus and emit the thermal radiation and infrared radiation signals incident from their corresponding sensing areas. For example, the focusing area is used to focus and emit incident thermal radiation and infrared radiation signals to the liquid crystal module 22 , and the thermal radiation and infrared radiation signals are transmitted to the sensing chip 23 through the liquid crystal module 22 . In order to obtain better focusing effect and thinner thickness, for example, the focusing lens is a Fresnel lens divided into multiple focusing areas; for another example, the focusing lens is composed of multiple convex lenses spliced together, and each convex lens forms a focusing area.

The induction chip 23 is used to receive thermal radiation and infrared radiation signals, and send out induction signals when the thermal radiation and infrared radiation signals are within a preset radiation range. The thermal radiation and infrared radiation signals include at least one of an infrared radiation signal and a temperature radiation signal. Correspondingly, the sensing chip 23 includes at least one of an infrared pyroelectric sensor chip and a temperature sensor chip.

For example, the sensing chip 23 includes an infrared pyroelectric sensing chip for receiving an infrared radiation signal and generating a sensing signal when the infrared radiation signal is within a preset infrared radiation range. Specifically, the infrared pyroelectric sensing chip generates a sensing signal when the wavelength of the infrared radiation signal is within a preset wavelength range; or, the infrared pyroelectric induction chip generates a sensing signal when the wavelength of the infrared radiation signal is within the preset wavelength range and the intensity reaches a predetermined range. A sensing signal is generated when the infrared intensity threshold is set. Among them, since the infrared radiation wavelength and infrared radiation intensity of the human body and different objects are different, by selecting an infrared pyroelectric sensor chip with appropriate sensitivity, the preset thermal radiator and infrared radiator can be detected in a targeted manner. In addition, by setting up multiple infrared pyroelectric sensor chips with different sensitivities, a variety of preset thermal radiators and infrared radiators can be detected.

For example, the sensing chip 23 includes a temperature sensing chip for receiving a temperature radiation signal and generating a sensing signal when the temperature radiation signal is within a preset temperature range. Specifically, the temperature sensing chip generates a sensing signal when the intensity of the received temperature radiation signal is within a preset radiation intensity range. Since the intensity of temperature radiation signals emitted by the human body and different objects are different, by selecting a temperature radiation sensing chip with appropriate sensitivity, the preset thermal radiator and infrared radiator can be detected in a targeted manner. In addition, by setting up multiple temperature radiation sensing chips with different sensitivities, a variety of preset thermal radiators and infrared radiators can be detected.

Among them, the thermal radiator and infrared radiator in this embodiment include at least one of the human body, other living bodies and objects.

Specifically, the liquid crystal module 22 includes a liquid crystal cell and a matrix drive circuit, wherein the liquid crystal cell has a plurality of liquid crystal areas corresponding to a plurality of focus areas of the focusing lens, and the matrix drive circuit is used to drive the liquid crystal cell. Multiple LCD areas are turned on one by one. As shown in Figure 2, when the liquid crystal area is turned on, thermal radiation and infrared radiation signals can pass through, where "on" in Figure 2 means that the liquid crystal area is turned on.

Considering that the direction of thermal radiation and infrared radiation signals will change after being refracted by the focusing lens, as an implementation method, in order to reduce the direction deviation of the thermal radiation and infrared radiation signals emitted from the focusing lens, each focusing lens from the focusing lens The thermal radiation and infrared radiation signals emitted from the area can be incident on the corresponding liquid crystal area. The distance between the liquid crystal module and the focusing lens can be set within a preset distance range. For example, the distance between the liquid crystal module and the focusing lens can be set to 0.05cm. ~2cm, another example is to set the distance between the liquid crystal box and the focusing lens to 0.05cm~2cm.

In practical applications, when there are preset thermal radiators and infrared radiators in the sensing area, the thermal radiation and infrared radiation signals emitted by the preset thermal radiators and infrared radiators are incident on the focusing area of the focusing lens 21 corresponding to the sensing area. , focused by the focusing area corresponding to the sensing area and emitted to the liquid crystal area corresponding to the focusing area in the liquid crystal cell. The matrix drive circuit drives each liquid crystal area in the liquid crystal box to open one by one. When the liquid crystal area corresponding to the focus area is opened, the thermal radiation and infrared radiation signals emitted from the focus area pass through the liquid crystal area corresponding to the focus area and are emitted to the sensor chip 23 On the sensor chip 23, the sensor chip 23 receives thermal radiation and infrared radiation signals, and emits a sensor signal when the thermal radiation and infrared radiation signals reach a preset threshold. Since different liquid crystal areas have different turn-on times or orders, the thermal radiation and infrared radiation signals from different sensing areas arrive at the sensing chip 23 at different times or in different orders, thereby making it possible to determine presence based on the time at which the sensing chip 23 sends out sensing signals. The sensing area of the preset thermal radiator and infrared radiator is to determine the location range of the preset thermal radiator and infrared radiator.

The above-mentioned sensor can not only detect the existence of the preset thermal radiator and infrared radiator, but also determine the location range of the preset thermal radiator and infrared radiator. It has more diversified functions and a wider application range.

As shown in FIG. 3 , it is a schematic structural diagram of a sensor 20 according to another embodiment of the present invention. Compared with the sensor 20 shown in FIG. 2 , the sensor of this embodiment further includes a secondary lens 24 . The secondary lens 24 is disposed between the liquid crystal module and the sensing chip. For example, the secondary lens 24 is disposed between the liquid crystal cell and the sensing chip. The secondary lens is used to focus the incident thermal radiation and infrared radiation signals and emit them onto the sensing chip. Specifically, the secondary lens focuses the thermal radiation and infrared radiation signals emitted from the liquid crystal cell and emit them onto the sensing chip. In order to obtain better focusing effect and thinner thickness, for example, the secondary lens is a Fresnel lens; for another example, the secondary lens is composed of multiple convex lenses spliced together.

As an implementation manner, the area of the secondary lens is larger than the area of the liquid crystal cell, and the secondary lens completely covers the liquid crystal cell. In this way, the thermal radiation and infrared radiation signals emitted from each liquid crystal area of the liquid crystal cell can be incident on the secondary lens. , Reduce the loss of thermal radiation and infrared radiation signals due to direction deviation.

As another implementation manner, the distance between the liquid crystal module and the secondary lens is less than the preset distance threshold, which can reduce the deviation of the thermal radiation and infrared radiation signals emitted from the liquid crystal cell of the liquid crystal module, further ensuring that the distance from the liquid crystal cell to The thermal radiation and infrared radiation signals emitted from each liquid crystal area can be incident on the secondary lens.

In a practical application, in addition to the focusing lens, liquid crystal module and sensor chip described in the above embodiment, as shown in Figure 4, the sensor 20 also includes a logic circuit 24, and the logic circuit 24 is connected to the matrix of the liquid crystal module respectively. Driving circuit 22 and sensor chip 23 . The logic circuit 24 is used to receive the identification information of the currently turned on liquid crystal area from the matrix drive circuit in real time, and to receive the induction signal from the induction chip; the logic circuit 24 is also used to synchronize the induction signal with the identification information. Establish corresponding relationships. The above-mentioned synchronization refers to synchronization in time, that is to say, when the logic circuit 24 receives the identification information of the liquid crystal area and the induction signal sent by the induction chip at the same time, it establishes the corresponding relationship between the identification information and the induction signal. In other words, when receiving the sensing signal from the sensing chip, the logic circuit 24 establishes a corresponding relationship between the currently or most recently received identification information of the liquid crystal area and the sensing signal. By establishing the corresponding relationship between the identification information of the liquid crystal area and the sensing signal, it can be determined that the focusing area corresponding to the liquid crystal area is the target focusing area that focuses on the thermal radiation and infrared radiation signals, and the sensing area corresponding to the target focusing area exists Preset the area of the thermal radiator and the infrared radiator, so that the location range of the preset thermal radiator and the infrared radiator can be determined.

Wherein, one of the logic circuits can be connected to at least one set of sensing chips and matrix driving circuits. For example, the sensor includes a focusing lens, a liquid crystal module, a sensing chip and a logic circuit. The logic circuit is connected to the matrix drive circuit of the liquid crystal module and the sensing chip, and is suitable for thermal radiators and infrared radiators in a smaller range. Detection, for another example, the sensor includes multiple focusing lenses, multiple liquid crystal modules, multiple sensing chips and a logic circuit. The logic circuit is respectively connected to the matrix drive circuits of the multiple liquid crystal modules and the multiple sensing chips. At this time, the sensor It is suitable for open places and can detect large-scale thermal radiators and infrared radiators.

Among them, if the identification information in multiple consecutive correspondences is the same within a period of time, it means that within this period of time, there are thermal radiators and infrared radiators in the sensing area corresponding to the liquid crystal area corresponding to the identification information, and the thermal radiator The radiator and the infrared radiator did not move during this time.

If the identification information in multiple consecutive correspondences changes within a period of time, one situation is that there are thermal radiators and infrared radiators in the sensing areas corresponding to multiple liquid crystal areas. At this time, the logic circuit is in one of the liquid crystal areas. During the opening period, at least two sets of synchronized identification information and sensing information are received, thereby establishing at least two corresponding relationships. Therefore, the difference in time for the logic circuit to continuously establish two corresponding relationships is less than the turn-on period of the liquid crystal region. Another situation is that the thermal radiator and infrared radiator are moving. Since the position changes of the thermal radiator and infrared radiator are continuous, at this time, the two identification information in each two consecutive correspondences established by the logic circuit should be The identification information corresponding to the adjacent sensing areas, that is, the two pieces of identification information in each of the two consecutive correspondences established by the logic circuit have an adjacent relationship.

In order to detect thermal radiators and infrared radiators present in multiple sensing areas, in another practical application, as shown in Figure 5, compared to the sensor 20 shown in Figure 4, the sensor of this embodiment also includes Processor 25. The processor 25 is configured to receive the corresponding relationship information between the induction signal and the identification information and append the reception time information; the processor 25 is also configured to have at least two of the induction signals and the identification information within a preset time range. When the corresponding relationship information is obtained, the first control signal is generated. The first control signal is a preset control signal corresponding to when the presence of multiple preset heat radiators and infrared radiators is detected. For example, the first control signal is an opening control signal, a closing control signal or an alarm control signal. Wherein, the preset time range is less than or equal to the opening period of the liquid crystal area. When there are at least two corresponding relationship information within the preset time range, it means that at least two preset thermal radiators and infrared are detected within the preset time range. The radiator, for example, detects at least two people within an on-cycle duration smaller than the liquid crystal area. At this time, the processor can generate a corresponding preset control signal when the presence of multiple preset thermal radiators and infrared radiators is detected, that is, The first control signal is used to realize door opening control, door closing control, alarm control or other control when multiple preset heat radiators and infrared radiators are detected.

In order to detect the movement of the thermal radiator and the infrared radiator, in another practical application, the sensor further includes a processor, and the processor is configured to receive the correspondence information between the induction signal and the identification information and additionally receive time information. ; The processor is also preset with the identification information list and its adjacent relationship; the processor is also configured to calculate the identification information according to the two continuously received sensing signals and their corresponding identification information and identification. The information list and its adjacent relationship are used to determine whether two consecutive pieces of identification information satisfy the adjacent relationship, and when the adjacent relationship is met, a second control signal is generated. The second control signal is a preset control signal corresponding to when the movement of the preset heat radiator and the infrared radiator is detected. For example, the second control signal is an opening control signal, a closing control signal or an alarm control signal. When the two identification information corresponding to the two continuously received sensing signals satisfy the adjacent relationship, it means that the preset thermal radiator and infrared are continuously detected in the two adjacent sensing areas corresponding to the two adjacent liquid crystal areas. The radiator, that is, the detected preset thermal radiator and infrared radiator move within two adjacent sensing areas. At this time, the processor can generate corresponding preset signals when the movement of the preset thermal radiator and infrared radiator is detected. A control signal, that is, a second control signal, is provided to realize door opening control, door closing control, alarm control or other control when movement of the preset heat radiator and infrared radiator is detected.

In yet another practical application, the sensor further includes a processor, configured to receive correspondence information between the sensing signal and the identification information and to append receiving time information; the processor is further configured to receive information based on at least a preset interval Assume that at least three of the induction signals and their corresponding identification information, the identification information list and their adjacent relationship are received continuously for a long time, and it is determined whether there are at least two consecutive identification information that satisfy the adjacent relationship, And determine whether there is duplicate identification information. When the adjacent relationship is satisfied and there is duplicate identification information, a third control signal is generated. Wherein, the third control signal is a preset control signal corresponding to when it is detected that the preset thermal radiator and the infrared radiator move back and forth or when a human body is detected waving. For example, the third control signal is a door opening control signal, a door closing control signal or a voice playback control signal, etc. When at least three sets of synchronized induction signals and their corresponding identification information are continuously received, there is repeated identification information, and at least two consecutive identification information satisfy the adjacent relationship, and every two induction signals and their corresponding identification information When the receiving times are all separated by at least the preset time, it means that the preset thermal radiator and infrared radiator are moving back and forth or people are waving their hands, so that the preset thermal radiator and infrared radiator are detected in the same sensing area at least twice, and Preset thermal radiators and infrared radiators are detected in this sensing area and its adjacent sensing areas. At this time, the processor can generate a control signal corresponding to when the preset heat radiator and infrared radiator are detected to move back and forth or when the human body is detected to wave, that is, the third control signal, thereby realizing that when the preset heat radiator and infrared radiation are detected Door opening control, door closing control, voice playback control or other controls when the body is moving. Among them, the above-mentioned preset time is longer than the time for the liquid crystal area to be turned on once. In this way, misjudgment can be avoided when there are two stationary preset heat radiators and infrared radiators in two adjacent sensing areas.

Using the above-mentioned sensor, it can not only detect the existence of the preset heat radiator and infrared radiator, but also determine the location range of the preset heat radiator and infrared radiator, and then detect the number of the preset heat radiator and infrared radiator. , movement and waving movements and generate corresponding control signals, making the sensor's functions more diverse and its application range wider.

The technical features of the above-described embodiments can be combined in any way. To simplify the description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as the combination of these technical features does not cause contradictions, All should be considered to be within the scope of this manual.

The above-mentioned embodiments only express several implementation modes of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the patent of the present invention should be determined by the appended claims.

Claims (10)

1. A sensor, including a focusing lens and a sensing chip; The focusing lens has multiple focusing areas, and the focusing areas are used to focus and emit incident thermal radiation and infrared radiation signals onto the sensing chip; The induction chip is used to receive thermal radiation and infrared radiation signals, and send out induction signals when the thermal radiation and infrared radiation signals are within a preset radiation range; characterized in that, the sensor also includes a sensor provided on the focusing lens a liquid crystal module between the sensor chip; The liquid crystal module includes a liquid crystal cell and a matrix drive circuit, the liquid crystal cell having a plurality of liquid crystal areas corresponding to the plurality of focus areas of the focusing lens; The matrix driving circuit is used to drive the plurality of liquid crystal areas of the liquid crystal box to open one by one, and the thermal radiation and infrared radiation signals can pass through the liquid crystal areas when they are opened; The sensor also includes a logic circuit, the logic circuit is connected to the matrix driving circuit and the sensing chip respectively, and the logic circuit is used to receive in real time the identification information of the currently turned on liquid crystal area sent by the matrix driving circuit, And receive the induction signal sent by the induction chip; When receiving the sensing signal from the sensing chip, the logic circuit establishes a corresponding relationship between the currently or most recently received identification information of the liquid crystal area and the sensing signal; The sensor further includes a processor configured to receive correspondence information between the sensing signal and the identification information and to additionally receive time information; The processor is also configured to determine whether there are at least two sensing signals based on at least three sensing signals continuously received every at least a preset time period and their corresponding identification information, the identification information list and their adjacent relationships. The continuous identification information satisfies the adjacent relationship, and determines whether there is repeated identification information. When the adjacent relationship is satisfied and there is repeated identification information, a third control signal is generated; the third control signal is a preset When it is detected that the preset thermal radiator and the infrared radiator move back and forth or a human body is detected waving, the corresponding control signal is detected; the preset time is longer than the time the liquid crystal area is turned on once. 2. The sensor of claim 1, wherein the processor is further configured to generate a third message when there are at least two corresponding relationship information between the sensing signal and the identification information within a preset time range. a control signal. 3. The sensor of claim 1, wherein the processor is also preset with the identification information list and its adjacent relationship; The processor is also configured to determine whether two consecutive pieces of identification information satisfy the requirements of the corresponding identification information based on the two consecutively received sensing signals and their corresponding identification information, the identification information list and their adjacent relationship. neighbor relationship, and when the neighbor relationship is satisfied, a second control signal is generated. 4. The sensor of claim 1, wherein the distance between the liquid crystal module and the focusing lens is 0.05 cm to 2 cm. 5. The sensor of claim 1, wherein the sensor further includes a secondary lens disposed between the liquid crystal module and the sensing chip, the secondary lens being used to convert the incident Thermal radiation and infrared radiation signals are focused and emitted onto the sensor chip. 6. The sensor of claim 5, wherein the secondary lens has an area larger than the liquid crystal cell, and the secondary lens completely covers the liquid crystal cell. 7. The sensor of claim 5, wherein the focusing lens and the secondary lens are Fresnel lenses. 8. The sensor of claim 5, wherein the focusing lens and the secondary lens are spliced by a plurality of convex lenses. 9. The sensor according to any one of claims 1 to 8, wherein the sensing chip is a pyroelectric sensing chip. 10. The sensor according to any one of claims 1 to 8, wherein the sensing chip is a temperature sensing chip.