Multiple detection automatic heating camera module

Abstract

The embodiment of the present invention discloses a multi-detection automatic heating camera module, which at least includes a lens barrel, a first lens arranged at the front end of the lens barrel, a pressure cover that cooperates with the front end of the lens barrel to lock the first lens on the lens barrel, and a heating plate that can heat the first lens. A flange is provided at the rear end of the pressure cover, and the heating plate is arranged close to the flange. In the multi-detection automatic heating camera module of the embodiment of the present invention, the heating plate is arranged close to the pressure cover flange, and heat is transferred to the first lens through the pressure cover flange, which has a good heating effect and is conducive to miniaturization of the entire module. In cold or humid weather conditions or environments, the effect of automatic defrosting and defog can be achieved. It is suitable for many fields such as vehicle-mounted lenses and outdoor monitoring.

Description

Technical field:

[0001] The invention relates to a multi-detection automatic heating camera module. Background technology:

[0002] Most of the existing camera modules with heating function control the heating plate by directly turning the power on and off, and some are controlled by software. That is, the existing camera modules with heating function cannot adjust or change the heat generation by the heating plate itself, and a series of control circuits or software are required to achieve this. Summary of the invention:

[0003] In order to overcome the problem that the existing camera module with heating function cannot adjust or change the heating value by the heating plate itself and needs to cooperate with a series of control circuits or software to achieve it, an embodiment of the present invention provides a multi-detection automatic heating camera module.

[0004] A multi-detection automatic heating camera module includes at least a lens and a heating plate arranged on the lens. The heating plate includes at least upper and lower metal conductive heating layers and a temperature-sensitive variable resistance ink layer. The metal conductive heating layer and the temperature-sensitive variable resistance ink layer are connected in series. The temperature-sensitive variable resistance ink layer is used to detect the temperature signal of the heating plate and change its own resistance according to the temperature signal, thereby changing the heating value of the metal conductive heating layer.

[0005] The multi-detection automatic heating camera module of the embodiment of the present invention has a temperature-sensitive variable resistance ink layer, which is used to detect the temperature signal of the heating plate and change its own resistance according to the temperature signal, thereby changing the heating value of the metal conductive heating layer to achieve automatic defrosting and defogger. It has a simple structure and can be automatically adjusted and controlled. Description of the drawings:

[0006] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0007] Figure 1 It is a structural schematic diagram of an embodiment of a multi-detection automatic heating camera module of the present invention;

[0008] Figure 2 It is a structural explosion diagram of an embodiment of a multi-detection automatic heating camera module of the present invention;

[0009] Figure 3 It is a structural schematic diagram of an embodiment of a heating sheet of the present invention;

[0010] Figure 4It is a cross-sectional structural diagram of an embodiment of a heating sheet of the present invention;

[0011] Figure 5 Schematic diagram of the circuit structure of the camera module according to an embodiment of the present invention;

[0012] Figure 6 Schematic diagram of the voltage conversion circuit structure of the camera module according to an embodiment of the present invention. Specific implementation method:

[0013] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0014] When the embodiments of the present invention mention ordinal numbers such as "first" and "second", unless they do express the meaning of order according to the context, they should be understood as being merely for the purpose of distinction.

[0015] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] like Figure 1 As shown, a multi-detection automatic heating camera module at least includes a lens barrel 2, a first lens 3 arranged at the front end of the lens barrel, a pressure cover 4 that cooperates with the front end of the lens barrel to lock the first lens 3 on the lens barrel 2, and a heating plate 1 that can heat the first lens 3. A flange 41 is provided at the rear end of the pressure cover 4, and the heating plate 1 is arranged close to the flange 41.

[0017] In the multi-detection automatic heating camera module of the embodiment of the present invention, the heating sheet is arranged close to the gland flange, and the heat is transferred to the first lens through the gland flange, which has a good heating effect and is conducive to miniaturization of the module as a whole. In cold or humid weather conditions or environments, the automatic defrosting and defogging effects can be achieved. It is suitable for many fields such as vehicle-mounted lenses and outdoor monitoring.

[0018] Further, as a preferred implementation of the present solution but not limiting, a locking ring 5 is further provided on the lens barrel 2 below the gland flange 41, and the heating sheet 1 is provided between the flange 41 and the locking ring 5. The structure is simple, and the heating defrosting and defogging effects are good, which is conducive to the miniaturization design of the camera module.

[0019] Furthermore, as a preferred implementation of this solution but not limiting, the lower surface of the flange 41 is an annular plane, and the upper surface of the heating plate 1 is in surface contact with the annular plane, so the heating effect is good.

[0020] Furthermore, as a preferred implementation mode of this solution but not limiting, Figure 2 As shown, the locking ring 5 is a tapered sleeve with a larger upper portion and a smaller lower portion, and is provided with a first pressing flange 51 on the radial inner side and a second pressing flange 52 on the radial outer side, and an annular groove 53 is provided between the first pressing flange 51 and the second pressing flange 52; the first pressing flange 51 is locked to the inner edge of the lower surface of the heating sheet 1, and the second pressing flange 52 is locked to the outer edge of the lower surface of the heating sheet 1. The structure is simple.

[0021] Furthermore, as a preferred implementation mode of this solution but not limiting, Figure 3 , Figure 4 As shown, the heating sheet 1 comprises a PI film layer 11, a metal conductive heating layer 12, a temperature-sensitive variable resistance ink layer 13, and a PI film layer 14, which are arranged in order from top to bottom. The structure is simple.

[0022] Furthermore, as a preferred implementation of this solution but not limiting, the metal conductive heating layer 12 is an iron-chromium-aluminum foil layer or a copper foil layer, which has a simple structure and high thermal efficiency.

[0023] Furthermore, as a preferred implementation manner of the present solution but not limiting, the temperature-sensitive resistive ink layer 13 is made of polycrystalline ceramic material and one or more materials selected from carbon black, graphite, or graphene.

[0024] Furthermore, as a preferred implementation of the present solution but not limiting, the resistance value R of the temperature-sensitive variable resistance ink layer 13 increases with the increase of the temperature value T, and the resistance value R of the temperature-sensitive variable resistance ink layer 13 decreases with the decrease of the temperature value T. Simple structure.

[0025] Furthermore, as a preferred implementation of the present invention but not limiting, the overall thickness of the heating sheet 1 is 0.5-2.5 mm, which is simple in structure and easy to use.

[0026] Furthermore, as a preferred implementation mode of this solution but not limiting, Figure 3 As shown, the heating sheet 1 is annular in shape and has a simple structure, and is convenient to be mounted on the lens barrel.

[0027] Furthermore, as a preferred implementation of the present solution but not a limitation, the metal conductive heating layer 12 is connected in series with the temperature-sensitive variable resistance ink layer 13, and the metal conductive heating layer 12 and the temperature-sensitive variable resistance ink layer 13 are isolated by insulation treatment or by an insulating layer, and the temperature-sensitive variable resistance ink layer 13 is used to detect the temperature signal of the heating sheet 1, and change its own resistance according to the temperature signal, thereby changing the heat generated by the metal conductive heating layer 12. The heating sheet can automatically adjust the heat generation directly through its own temperature-sensitive variable resistance ink layer.

[0028] Furthermore, as a preferred implementation mode of this solution but not limiting, Figure 5 As shown, the multi-detection automatic heating camera module also includes a single-chip microcomputer chip U6 and a temperature detection circuit. The temperature detection circuit is electrically connected to the input end of the single-chip microcomputer chip U6 and sends the detected temperature signal to the single-chip microcomputer chip U6; Figure 5 As shown, the output end of the single-chip microcomputer chip U6 is electrically connected to the heating plate 1, and the single-chip microcomputer chip U6 controls the start / stop of the heating plate 1 according to the received temperature signal.

[0029] Furthermore, as a preferred implementation of the present invention but not limiting, the temperature detection circuit at least includes a third terminal and a fourth terminal in the J4 interface for detecting the temperature signal of the heating sheet 1, and the third terminal and the fourth terminal in the J4 interface are electrically connected to the NTC sensor 15; Figure 3 As shown, the NTC sensor 15 is arranged on the outer surface of the PI film layer 11 or the PI film layer 14 on the heating sheet 1. The structure is simple, and it cooperates with the temperature-sensitive variable resistance ink layer 13 to detect the temperature signal of the heating sheet in multiple ways. Under normal temperature conditions (such as 5-45°C, including rain or fog in the middle of the environment), the temperature-sensitive variable resistance ink layer 13 in the heating sheet 1 changes its own resistance according to the temperature signal, thereby changing the heating value of the metal conductive heating layer 12, and realizing automatic adjustment of the heating value for defrosting and defogger. Under harsh environments (such as heavy snow and ice below 0°C), the single-chip microcomputer chip senses the harsh environment through the NTC sensor 15 in the temperature detection circuit, and controls the heating sheet 1 to instantly raise the temperature to the highest level to achieve the effect of rapid deicing and defogging.

[0030] Furthermore, as a preferred implementation mode of this solution but not limiting, Figure 5As shown, the first terminal and the second terminal in the J4 interface are used to electrically connect the temperature-sensitive variable resistance ink layer 13 and the metal conductive heating layer 12 connected in series. A driving circuit is arranged between the single-chip microcomputer chip U6 and the heating plate 1, and the driving circuit includes transistors Q1A and Q1B, a voltage regulator tube D4, a power transistor U5, a resistor R13, a resistor R14, and capacitors C28, C29, C30 and C31; the transistor Q1B is a PNP type tube, its emitter is connected to a +12V DC source, its collector is grounded through a resistor R14, and its base is connected to the collector of the transistor Q1A; the emitter of the transistor Q1A is grounded, and its substrate is connected to the single The microcontroller chip U6 is used to obtain a PWM control signal; the gate of the power transistor U5 is connected to the collector of the transistor Q1B, the source of the power transistor U5 is connected to the emitter of the transistor Q1B, and a voltage regulator D4 and a resistor R13 are arranged in parallel between the gate and the source, the drain of the power transistor U5 is connected to the heating plate 1 between the first terminal and the second terminal in the J4 interface, and the capacitors C28, C29, C30 and C31 are connected in parallel between the drain and the first terminal and the second terminal in the J4 interface.

[0031] Furthermore, as a preferred implementation mode of this solution but not limiting, Figure 5 As shown, the temperature detection circuit also includes an RC network between the third terminal of the J4 interface electrically connected to the NTC sensor 15 and the input terminal of the single-chip microcomputer chip, and the RC network includes a resistor R15 and a capacitor C32 connected in parallel between the output pin of the NTC sensor 15 and the ground terminal.

[0032] Furthermore, as a preferred implementation mode of this solution but not limiting, Figure 5 As shown, it also includes a power interface J3 disposed between the +12V DC source and the ground, and the power interface J3 is connected to the emitter of the transistor Q1B through the fuse F1.

[0033] Furthermore, as a preferred implementation mode of this solution but not limiting, Figure 6 As shown, it also includes a voltage conversion circuit for stepping down the input power supply voltage, the voltage conversion circuit includes a voltage conversion chip, a voltage regulator D5, an inductor L7, a resistor R147, a resistor R148, capacitors C59, C60, C61 and C62, the voltage conversion chip has an input terminal VIN, an output terminal SW and a feedback terminal FB, the input terminal VIN is connected to a +12V DC source and capacitors C61, C62 and a voltage regulator D5 are arranged in parallel, its output terminal SW generates a +5V voltage output through the inductor L7, a capacitor C59 is arranged between the output terminal SW and the feedback terminal FB, resistors R147 and R148 are connected in series between the inductor L7 and the ground terminal, capacitor C60 is connected in parallel with resistors R147 and R148, and the connection point of resistors R147 and R148 is connected to the feedback terminal FB.

[0034] As described above, one or more implementation methods are provided in combination with specific contents, and the specific implementation of the present invention is not limited to these descriptions. Any similarity or similarity with the method, structure, etc. of the present invention, or any technical deduction or replacement based on the concept of the present invention, shall be regarded as the protection scope of the present invention.

Claims

1. A multi-detection automatic heating camera module, which at least includes a lens and a heating sheet arranged on the lens, characterized in that: The heating sheet at least comprises a metal conductive heating layer and a temperature-sensitive variable resistance ink layer arranged above and below. The metal conductive heating layer and the temperature-sensitive variable resistance ink layer are connected in series. The temperature-sensitive variable resistance ink layer is used to detect the temperature signal of the heating sheet and change its own resistance according to the temperature signal, thereby changing the heat generated by the metal conductive heating layer. The lens at least comprises a lens barrel, a first lens arranged at the front end of the lens barrel, and a pressure cover which cooperates with the front end of the lens barrel to lock the first lens on the lens barrel, a flange is arranged at the rear end of the pressure cover, and a heating plate is arranged close to the flange; A locking ring is also provided on the lens barrel below the gland flange, and the heating plate is provided between the flange and the locking ring; It also includes a single-chip microcomputer chip and a temperature detection circuit, the temperature detection circuit is electrically connected to the input end of the single-chip microcomputer chip, and sends the detected temperature signal to the single-chip microcomputer chip, the output end of the single-chip microcomputer chip is electrically connected to the heating plate, and the single-chip microcomputer chip controls the start / stop of the heating plate according to the received temperature signal; The heating sheet includes a first PI film layer, a metal conductive heating layer, a temperature-sensitive variable resistance ink layer, and a second PI film layer, which are arranged in sequence from top to bottom, and the temperature detection circuit includes at least an NTC sensor; The temperature detection circuit at least includes a third terminal and a fourth terminal in the J4 interface for detecting a temperature signal of the heating element, the third terminal and the fourth terminal in the J4 interface are electrically connected to the NTC sensor, and the NTC sensor is arranged on the outer surface of the first PI film layer or the outer surface of the second PI film layer on the heating element; The first terminal and the second terminal in the J4 interface are used to electrically connect the temperature-sensitive variable resistance ink layer and the metal conductive heating layer connected in series. A driving circuit is arranged between the single-chip microcomputer chip U6 and the heating sheet. The driving circuit includes transistors Q1A and Q1B, a voltage regulator tube D4, a power transistor U5, a resistor R13, a resistor R14, and capacitors C28, C29, C30 and C31; the transistor Q1B is a PNP type tube, its emitter is connected to a +12V DC source, its collector is grounded via a resistor R14, and its base is connected to the collector of the transistor Q1A; The emitter of the transistor Q1A is grounded, and its substrate is connected to the single-chip microcomputer chip U6 to obtain a PWM control signal; the gate of the power transistor U5 is connected to the collector of the transistor Q1B, and its source is connected to the emitter of the transistor Q1B, and a voltage regulator D4 and a resistor R13 are arranged in parallel between the gate and the source, and its drain is connected to the heating sheet between the first terminal and the second terminal in the J4 interface, and the capacitors C28, C29, C30 and C31 are connected in parallel between the drain and the first terminal and the second terminal in the J4 interface in sequence; The temperature detection circuit also includes an RC network provided between the third terminal of the J4 interface electrically connected to the NTC sensor 15 and the input terminal of the single-chip microcomputer chip, the RC network including a resistor R15 and a capacitor C32 connected in parallel between the output pin of the NTC sensor 15 and the ground terminal; It also includes a power interface J3 disposed between a +12V DC source and ground, and the power interface J3 is connected to the emitter of the transistor Q1B through a fuse F1; It also includes a voltage conversion circuit for stepping down the input power supply voltage, the voltage conversion circuit includes a voltage conversion chip, a voltage regulator D5, an inductor L7, a resistor R147, a resistor R148, capacitors C59, C60, C61 and C62, the voltage conversion chip has an input terminal VIN, an output terminal SW and a feedback terminal FB, the input terminal VIN is connected to a +12V DC source and capacitors C61, C62 and a voltage regulator D5 are arranged in parallel, its output terminal SW generates a +5V voltage output through the inductor L7, a capacitor C59 is arranged between the output terminal SW and the feedback terminal FB, resistors R147 and R148 are connected in series between the inductor L7 and the ground terminal, capacitor C60 is connected in parallel with resistors R147 and R148, and the connection point of resistors R147 and R148 is connected to the feedback terminal FB.

2. The multi-detection automatic heating camera module according to claim 1, characterized in that: The lower surface of the flange is an annular plane, and the upper surface of the heating plate is in surface contact with the annular plane.

3. The multi-detection automatic heating camera module according to claim 2, characterized in that: The locking ring is a conical socket part which is larger at the top and smaller at the bottom. A first clamping flange is provided on the radial inner side and a second clamping flange is provided on the radial outer side. An annular groove is provided between the first clamping flange and the second clamping flange. The first clamping flange is locked to the inner edge of the lower surface of the heating plate, and the second clamping flange is locked to the outer edge of the lower surface of the heating plate.

4. The multi-detection automatic heating camera module according to claim 3, characterized in that: The metal conductive heating layer is an iron-chromium-aluminum foil layer or a copper foil layer.

5. The multi-detection automatic heating camera module according to claim 4, characterized in that: The temperature-sensitive variable resistance ink layer is made of polycrystalline ceramic material and one or more materials selected from carbon black, graphite, or graphene.

6. The multi-detection automatic heating camera module according to claim 5, characterized in that: The resistance value R of the temperature-sensitive variable resistance ink layer increases as the temperature value T increases, and the resistance value R of the temperature-sensitive variable resistance ink layer decreases as the temperature value T decreases.

Images