CN209803647U - A temperature control device, camera lens control by temperature change module and unmanned aerial vehicle equipment for camera lens - Google Patents

Abstract

The utility model relates to a temperature control device, camera lens control by temperature change module and unmanned aerial vehicle equipment for camera lens. The temperature control device comprises a heating part which is arranged around the lens; a control part electrically connected to the heating part; and a temperature sensing part embedded in the heating part and transmitting the sensed temperature of the heating part to the control part; wherein the control component generates a comparison signal indicative of a comparison of the temperature of the heating component and a first predetermined temperature, the control component controlling the current flowing from the power source to the heating component based on the comparison signal. The utility model is used for the optical imaging field. The technical effect of the utility model is that a device of the temperature drift of reduction camera lens is provided.

Description

A temperature control device, camera lens control by temperature change module and unmanned aerial vehicle equipment for camera lens

Technical Field

The utility model relates to a camera lens temperature control device especially relates to one kind and is used for on-vehicle, the photography of unmanned aerial vehicle, and the thing networking reduces the temperature control device of camera lens temperature drift in intelligent house, machine vision etc. uses.

Background

the lens of the micro lens is mostly made of optical resin materials due to the processing technology and cost of the micro lens. In contrast to glass lenses, optical resin lenses, while cost-controllable, also have their own disadvantage, namely that the thermal properties are far from comparable to glass materials. The thermal expansion coefficient of the optical resin lens is far higher than that of glass, and the temperature coefficient of the refractive index of the optical resin lens is far higher than that of the glass. Therefore, as the temperature rises or falls, the refractive index of the optical resin lens correspondingly and remarkably decreases or increases, and when the use temperature environment changes, the relative position between the optical focal plane of the optical resin lens and the imaging plane of the image sensor shifts, so that focusing is inaccurate, and the imaging definition is influenced. Therefore, it is an objective in the industry to improve performance and reduce cost.

In general, in consumer electronics, optical resin lenses are often used to achieve miniaturization, weight reduction, and product cost reduction. The imaging definition of the product is obviously reduced in a high-temperature or low-temperature use environment, and the product performance is seriously influenced. What is needed is a cost effective design that improves lens temperature drift and is manufacturable in large quantities.

SUMMERY OF THE UTILITY MODEL

The to-be-solved problem of the utility model is to provide a can improve camera lens temperature control device of camera lens temperature drift.

In order to solve the technical problem existing above, the utility model discloses a following technical scheme:

A temperature control device for a lens, characterized by comprising: a heating member disposed around the lens; a control part electrically connected to the heating part; and a temperature sensing part embedded in the heating part and transmitting the sensed temperature of the heating part to the control part; wherein the control component generates a comparison signal indicative of a comparison of the temperature of the heating component and a first predetermined temperature, the control component controlling the current flowing from the power source to the heating component based on the comparison signal.

Preferably, the control part disconnects the heating part from the power supply if the temperature of the heating part is higher than a first predetermined temperature, and couples the heating part with the power supply if the temperature of the heating part is less than the first predetermined temperature.

Preferably, the control part disconnects the heating part from the power supply if the temperature of the heating part is higher than a first predetermined temperature, and adjusts the value of the current flowing from the power supply to the heating part according to the temperature of the heating part if the temperature of the heating part is less than the first predetermined temperature.

preferably, the control part further includes: a comparator coupled to the temperature sensing part, the comparator comparing the temperature of the heating part sensed by the temperature sensing part with a first predetermined temperature and transmitting a comparison signal; a heating switching circuit coupled to the comparator and further coupled between the power supply and the heating component, wherein the heating switching circuit receives the comparison signal sent by the comparator and disconnects or couples the heating component from the power supply based on the comparison signal.

Preferably, the heating switching circuit further includes: an NPN type triode, the base of which is coupled to the comparator to amplify the comparison signal from the comparator; and a P-channel MOSFET having a gate coupled to a collector of the NPN transistor, a source coupled to a power supply, and a drain connected to the heating part to disconnect or couple the heating part from the power supply based on a signal from the collector of the NPN transistor.

Preferably, the heating member is disposed around a lens barrel of the lens.

Preferably, the heating member includes a heating film region, a soldering reinforcement region, and a heating film pad, wherein the temperature sensing member is embedded in the heating film region of the heating member.

Preferably, the heating member is a flexible heating film including an upper film, a heating wire, and a lower film, wherein the heating wire is sandwiched between the upper film and the lower film and the upper film is closer to a lens barrel of the lens than the lower film.

Preferably, the upper film is a polyimide PI film, and the lower film is a polyimide PI film.

Preferably, the heating member is attached to a lens barrel of the lens through a colloid layer, wherein the colloid layer contacts the upper film.

Preferably, the temperature sensing part is a thermistor NTC.

Preferably, the first predetermined temperature is 40 ℃.

Preferably, the heating switching circuit disconnects the power supply and the heating element by default when the lens is initially powered up.

preferably, the control part is further electrically connected to an image sensor of the lens and receives a temperature of the image sensor, wherein the power supply and the heating part are forcibly disconnected when the temperature of the image sensor is higher than a second predetermined temperature, which is higher than the first predetermined temperature.

Preferably, the second predetermined temperature is 90 ℃.

Preferably, the signal from the temperature sensing component is sampled by a control circuit and then analog-to-digital converted to obtain a real-time temperature.

in another embodiment, the present invention further adopts the following technical solutions:

A lens temperature control module comprises a lens module including a lens; and a temperature control module according to the above.

In another embodiment, the present invention further adopts the following technical solutions:

An unmanned aerial vehicle equipment, includes as above the camera lens temperature control module.

Compared with the prior art, the utility model has the advantages of as follows: in a tiny space, the temperature of the optical device is controlled, the working temperature range of the fixed-focus lens is expanded in a large range, and the imaging quality and the accuracy of a machine vision algorithm are improved. The design has low cost, high efficiency and the capability of mass production of a production line.

drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure. For purposes of simplicity and clarity in representing elements in the figures, the elements in the figures are not drawn to scale.

The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:

fig. 1A, 1B and 1C are schematic views of a temperature-controlled lens module according to an embodiment of the present invention.

Fig. 2 is a schematic diagram and a composition of a control unit according to an embodiment of the present invention.

fig. 3 is a schematic circuit diagram of a heating switching circuit according to an embodiment of the present invention.

Fig. 4 is a cross-sectional view of a polyimide PI heating film according to an embodiment of the present invention.

Fig. 5 is an outline view of a polyimide PI heating film according to an embodiment of the present invention.

Fig. 6 is a flow chart of temperature control according to the present invention.

Note that in the embodiments described below, the same reference numerals are used in common between different drawings to denote the same portions or portions having the same functions, and a repetitive description thereof will be omitted. In this specification, like reference numerals and letters are used to designate like items, and therefore, once an item is defined in one drawing, further discussion thereof is not required in subsequent drawings.

For convenience of understanding, the positions, sizes, ranges, and the like of the respective structures shown in the drawings and the like do not sometimes indicate actual positions, sizes, ranges, and the like. Therefore, the disclosed invention is not limited to the positions, dimensions, ranges, and the like disclosed in the drawings and the like.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.

Fig. 1A to 1C are diagrams of a lens temperature control device according to an embodiment of the present invention. Fig. 1A shows a lens apparatus including a lens, a lens barrel, and a lens base. Fig. 1B shows the lens temperature control device in an assembling process, in which the heating member 101 has been welded to the control member 103 but has not been disposed around the lens 102. In the embodiment shown in fig. 1A-1C, the control component 103 is integrated at the lens, but the invention is not limited thereto, and the control component 103 may also be located on a circuit board inside the aircraft. Fig. 1C shows the lens temperature control device after assembly is completed, in which the heating member 101 is disposed around the lens 102.

As shown in fig. 1C, the lens temperature control apparatus 100 includes a heating member 101, and the heating member 101 is disposed around a lens 102. The heating member 101 is preferably a flexible heating film, and more preferably a flexible polyimide PI heating film. The composition structure of the flexible polyimide PI heating film will be described in detail below with reference to fig. 4 and 5.

the lens temperature control device 100 further includes a control section 103 and a temperature sensing section 104. The control part 101 is electrically connected to the heating part 101; the temperature sensing part 104 is embedded in the heating part 101 and transmits the sensed temperature of the heating part 101 to the control part 103. In operation, the control component 103 generates a comparison signal indicative of a comparison of the temperature of the heating component 101 and a first predetermined temperature, the control component 103 controlling the current flowing from the power supply to the heating component 101 based on the comparison signal. Preferably, the power supply is integrated in the control unit 103.

for sensing and controlling the real-time temperature of the heating member 101 and thus the real-time temperature of the lens, the utility model discloses integrate the temperature sensing member 104 into the heating member 101. Preferably, the temperature sensing part 104 employs a negative temperature coefficient NTC thermistor (hereinafter referred to as NTC thermistor) to monitor the temperature of the heating part 101 in real time, and transmits the sensed temperature of the heating part 101 to the control part 103 and implements closed-loop temperature control of the heating part 101 with the control part 103. In one embodiment of the present invention, the resistance of the NTC thermistor gradually increases as the temperature decreases, so the resistance of the NTC thermistor can be converted into the temperature it senses through processing. In one embodiment of the present invention, one end of the temperature sensing component 104 is electrically coupled to ground, and the other end is electrically coupled to the control circuit 103, and the control circuit 103 samples and performs analog-to-digital conversion on the signal sensed by the temperature sensing component 104 to obtain the real-time temperature.

After the product is turned on, the control circuit 103 controls the power supply to supply power to the heating part 101. The control circuit 103 collects a temperature signal from the temperature sensing part 104 to measure a real-time temperature. In an embodiment of the present invention, when the temperature is low, the control circuit 103 couples the power supply to the heating part 101 so that the temperature of the lens is raised; when the temperature rises to the first predetermined temperature, the control circuit 103 disconnects the power supply from the heating member 101, and the heating member stops warming so that the temperature rise of the lens can be stopped or slowed.

in one embodiment of the present invention, the control unit 103 disconnects the heating unit 101 from the power supply if the temperature of the heating unit 101 is higher than a first predetermined temperature, and the control unit 103 couples the heating unit 101 to the power supply if the temperature of the heating unit 101 is less than the first predetermined temperature. Preferably, the first predetermined temperature is about 40 ℃.

In another embodiment of the present invention, if the temperature of the heating member 101 is higher than the first predetermined temperature, the control member 103 disconnects the heating member 101 from the power supply, and if the temperature of the heating member 101 is lower than the first predetermined temperature, the control member 103 adjusts the magnitude of the current flowing from the power supply to the heating member 101 according to the temperature of the heating member 101. In a preferred embodiment, if the temperature of the heating member 101 is closer to the first predetermined temperature, for example less than a predetermined threshold, the value of the current flowing from the power supply to the heating member 101 is adjusted down; if the temperature of the heating member 101 is far from the first predetermined temperature, for example, greater than a predetermined threshold value, the value of the current flowing from the power supply to the heating member 101 is maintained at the initial setting. In another preferred embodiment, the temperature flowing from the power supply to the heating member 101 is linearly adjusted according to the difference between the temperature of the heating member 101 and the first predetermined temperature.

In an embodiment of the present invention, since the heating component 101 is disposed around the lens barrel of the lens so that the heating component 101 is located at a certain distance from the optical lens, the temperature sensed by the temperature sensing component 104 indicates the temperature of the heating component 101 (or the lens barrel), and the temperature of the lens itself may be delayed from the temperature of the lens barrel because the heat needs to pass through the lens barrel with a certain thickness to finally reach the lens. For example, during warming, the actual temperature of the lens barrel may be lower than the temperature of the lens barrel sensed by the temperature sensing component 104. Therefore, in actual operation, the value of the first predetermined temperature may be determined by collecting data through a plurality of experiments to fit the temperature relationship between the lens barrel and the lens barrel.

Fig. 2 is a schematic diagram and a composition of the control unit 103 according to an embodiment of the present invention. The control part 103 comprises a collecting and temperature controlling component 1031, the collecting and temperature controlling component 1031 is coupled to the temperature sensing part 104, the collecting and temperature controlling component 1031 compares the temperature of the heating part 101 sensed by the temperature sensing part 104 with a first predetermined temperature and sends a comparison signal; the control component 103 further comprises a heating switching circuit 1032, the heating switching circuit 1032 being coupled to the collection and temperature control component 1031 and further being coupled between the power supply and the heating component 101, wherein the heating switching circuit 1032 receives the comparison signal sent by the collection and temperature control component 1031 and disconnects or couples the heating component 101 from the power supply based on the comparison signal.

In the embodiment shown in fig. 2, the power supply is integrated in the control unit 103. It will be appreciated by those skilled in the art that the present invention is not limited to the power source being integrated into the control component 103, and the power source may also be located outside the control component 103 as a separate component.

In an embodiment of the present invention, when the lens is initially powered up, the heating switching circuit 1032 defaults to disconnect the power supply and the heating part 101 to avoid a malfunction.

In another embodiment of the present invention, the control part 103 is further electrically connected to the image sensor 105 of the lens and receives a temperature signal of the image sensor 105, wherein the control part 103 forcibly disconnects the power supply and the heating part 101 when the temperature of the image sensor 203 is higher than a second predetermined temperature, which is higher than the first predetermined temperature. Preferably, the second predetermined temperature is 90 ℃. Specifically, in order to implement a thermal protection function, the collecting and temperature controlling component 1031 in the control component 103 simultaneously reads the temperature of the heating component 101 and the temperature data of the image sensor 105 (e.g., CMOS) of the lens, and when the temperature of the image sensor is higher than a certain value, the collecting and temperature controlling component 1031 sends a comparison signal to the heating switching circuit 1032 to forcibly disconnect the coupling between the heating component 101 and the power supply, thereby protecting the lens, the image sensor, and related circuitry from the damage of an excessive temperature.

Fig. 3 is a schematic circuit diagram of a heating switching circuit 1032 according to an embodiment of the invention. The heating switching circuit 1032 further comprises an NPN transistor Q2501 having a base coupled to the acquisition and temperature control component of the control unit for amplifying the comparison signal from the acquisition and temperature control component; the heating switching circuit also includes a P-channel MOSFET Q2500 having a gate coupled to the collector of NPN transistor Q2501, a source coupled to a power supply, and a drain connected to a heating block to disconnect or couple the heating block from the power supply based on an amplified signal from the collector of NPN transistor Q2501. Although the heating switching circuit 1032 shown in fig. 3 utilizes NPN transistors for signal amplification and P-channel MOSFETs for switching control, the invention is not limited thereto, and those skilled in the art will understand that other electronic devices that can be used for signal amplification and switching control are also suitable for the invention.

Fig. 4 is a cross-sectional view of a heating member 101 according to an embodiment of the present invention. In one embodiment of the present invention, the heating member 101 is a flexible heating film including an upper film 101A, a heating wire 101B, a lower film 101C, wherein the heating wire 101B is sandwiched between the upper film 101A and the lower film 101C and the upper film 101A is closer to the lens barrel of the lens than the lower film 101C. In an embodiment of the present invention, the upper film 101A is a flexible polyimide PI film to ensure excellent strength and insulation, and the lower film 101C is an acrylic oligomer film to ensure flexibility of the heating member 101. In an embodiment of the present invention, the heating member 101 is attached to the lens barrel of the lens through a colloid layer 101D, wherein the colloid layer 101D contacts the upper film 101A. In an embodiment of the present invention, the glue layer 101D is a double-sided tape. In the narrow space of the lens mount, a flexible polyimide PI heating film is selected to be adhered around the lens barrel of the lens through the colloid layer 101D. The heating wire 101B is applied with an electric potential so that an electric current flows therethrough to generate heat, which is conducted from the heating wire 101B to the lens barrel through the upper film 101A (e.g., a flexible polyimide PI heating film) to the lens barrel to be conducted to the lens barrel to warm the lens. In an embodiment of the present invention, the flexible polyimide PI heating film is selected as the upper film 101A because of its excellent high temperature resistance, mechanical properties and chemical stability. In one embodiment of the present invention, the flexible polyimide PI film is a fixed product with a rated power of 13.2V/3.5W and a rated resistance of 50 Ω. Although a flexible polyimide PI heating film is used in one embodiment of the present invention, the present invention is not limited thereto, and those skilled in the art will appreciate that other types of flexible heating members may be used to heat the lens.

Fig. 5 is an external view of the heating member 101 according to the embodiment of the present invention. The heating member 101 shown in fig. 5 includes a heating film region 101E, a soldering reinforcement region 101F, and a heating film pad 101G, wherein the temperature sensing member 104 is embedded in the heating film region 101E of the heating member 101. Referring to the cross-sectional view of the heating member shown in fig. 4, the heating film area 101E is uniformly provided with heating wires, and positive and negative electrodes of the heating wires are led out through the heating pad 101G. In order to enhance the soldering strength, a soldering reinforcement area 101F is provided on the rear surface of the heating film pad 101G. A temperature sensing component 104 (e.g., a negative temperature coefficient NTC thermistor) is soldered in the heating film region 101E, preferably at the NTC thermistor pad location using a reflow soldering process. The positive and negative electrodes of the temperature sensing part 104 are also led out through the heating pad 101G to be connected to the control part. When the heating member 101 and the lens module are assembled, a heating film tool is used to align a heating film pad 101G of the heating member 101 with a lens module circuit board pad, and make the heating film pad 101G perpendicular to the lens module circuit board pad, the heating film pad 101G of the heating member is fixed on the circuit board pad by welding, and a heating film region 101E of the heating member 101 is closely attached to a lens barrel of the lens through a colloid layer in an annular manner.

Fig. 6 is a flow chart illustrating temperature control according to an embodiment of the present invention. In step 601, after the product is powered on, the acquisition and temperature control part of the control part samples the voltage of the negative temperature coefficient NTC thermistor; in step 602, the acquisition and temperature control unit of the control unit performs analog-to-digital conversion on the sampled voltage to obtain a real-time temperature; estimating the temperature of the lens using a PID algorithm in step 603; in step 604, the average power of the heating element is controlled by the PWM method according to the lens temperature estimated by the PID algorithm, so as to achieve precise temperature control of the lens.

In one embodiment of the present invention, the temperature rise slope is greater than 40 ℃/60s by temperature control. And stopping heating when the temperature of the lens barrel of the lens reaches 40 ℃ and keeping the temperature constant. The average power of the heating component is controlled by a Pulse Width Modulation (PWM) mode by using a PID algorithm, so that the temperature control precision can be maintained at (40 +/-2) DEG C, and the control convergence time after the specified temperature is reached is less than 10 s.

In one embodiment of the present invention, the control unit heats the temperature of the heating unit to a fixed temperature value no matter what the ambient temperature is (for example, no matter on ice, snow or cool summer). Therefore, the optical imaging plane of the image sensor can be arranged at a position which is coincident with the focal plane of the lens at a certain fixed temperature value, so that the imaging quality of the whole lens is improved, and the optical imaging plane of the image sensor does not need to be adjusted according to the temperature of the lens.

in the response time of 60s, according to the utility model discloses a temperature control device can realize good focusing effect through heating for the camera lens. From 0s, 30s to 60s, the lens exhibits gradually improved focusing effect and image quality, respectively. Even outdoors, the lens may exhibit a focusing effect and image quality similar to those of indoor use. In contrast, in a live-action test without using a temperature control device, the temperature of the lens is always kept at the outdoor ambient temperature, and the low temperature brings a certain degree of deformation to the lens and also changes the refractive index of the optical resin lens of the lens to a certain degree, so that the relative position drift of the optical focal plane of the lens and the imaging plane of the image sensor is generated, and the focusing is inaccurate. From 0s, 30s to 60s, the focus inaccuracy persists and is not effectively improved, and the image quality remains less than ideal. It can be seen that the lens using the temperature control device obtains a better focusing effect and image quality than the lens not using the temperature control device.

The utility model discloses an in the embodiment still disclose a camera lens temperature control module, camera lens temperature control module is including the camera lens module that has the camera lens, and as above the temperature control module.

The utility model discloses an in an embodiment still disclose an unmanned aerial vehicle equipment, unmanned aerial vehicle equipment includes as above camera lens temperature control module.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

Unless the context clearly dictates otherwise, the following terms take the meanings explicitly associated herein throughout the specification and claims. The meaning of "a" and "the" includes plural references, and the meaning of "in …" includes "in …" and "on …". The term "couple" refers to a direct electrical connection between the items coupled, or an indirect connection via one or more passive or active intermediary devices. The term "circuit" refers to a single component, or a plurality of components (active or passive) connected together to provide a desired function. The term "signal" refers to at least one current, voltage, or data signal.

in addition, directional terminology, such as "on …," "over …," "top," "bottom," etc., is used with reference to the orientation of the figure(s) being described. Because components of exemplary embodiments of the present invention can be positioned in a number of different orientations, the directional terminology is used for purposes of illustration only and is in no way limiting. The directional terms, when used in connection with an image sensor wafer or layers of a corresponding image sensor, are intended to be broadly interpreted, and thus should not be interpreted to preclude the presence of one or more intervening layers or other intervening image sensor features or elements. Thus, a given layer described herein as being formed on or over another layer may be separated from the other layer by one or more additional layers.

The terms "front," "back," "top," "bottom," "over," "under," and the like in the description and in the claims, if any, are used for descriptive purposes and not necessarily for describing permanent relative positions. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the exemplary embodiments of the disclosure described herein are, for example, capable of operation in other orientations than those illustrated or otherwise described herein.

As used herein, the word "exemplary" means "serving as an example, instance, or illustration," and not as a "model" that is to be replicated accurately. Any implementation exemplarily described herein is not necessarily to be construed as preferred or advantageous over other implementations. Furthermore, the disclosure is not limited by any expressed or implied theory presented in the preceding technical field, background, utility model content, or detailed description.

As used herein, the term "substantially" is intended to encompass any minor variation resulting from design or manufacturing imperfections, device or component tolerances, environmental influences, and/or other factors. The word "substantially" also allows for differences from a perfect or ideal situation due to parasitic effects, noise, and other practical considerations that may exist in a practical implementation.

The above description may indicate elements or nodes or features being "connected" or "coupled" together. As used herein, unless expressly stated otherwise, "connected" means that one element/node/feature is directly connected to (or directly communicates with) another element/node/feature, either electrically, mechanically, logically, or otherwise. Similarly, unless expressly stated otherwise, "coupled" means that one element/node/feature may be mechanically, electrically, logically, or otherwise joined to another element/node/feature in a direct or indirect manner to allow for interaction, even though the two features may not be directly connected. That is, coupled is intended to include both direct and indirect joining of elements or other features, including connection with one or more intermediate elements.

In addition, certain terminology may also be used in the following description for the purpose of reference only, and thus is not intended to be limiting. For example, the terms "first," "second," and other such numerical terms referring to structures or elements do not imply a sequence or order unless clearly indicated by the context.

It will be further understood that the terms "comprises/comprising," "includes" and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

in the present disclosure, the term "providing" is used broadly to encompass all ways of obtaining an object, and thus "providing an object" includes, but is not limited to, "purchasing," "preparing/manufacturing," "arranging/setting," "installing/assembling," and/or "ordering" the object, and the like.

Those skilled in the art will appreciate that the boundaries between the above described operations merely illustrative. Multiple operations may be combined into a single operation, single operations may be distributed in additional operations, and operations may be performed at least partially overlapping in time. Moreover, alternative exemplary embodiments may include multiple instances of a particular operation, and the order of operations may be altered in other various exemplary embodiments. However, other modifications, variations, and alternatives are also possible. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Although some specific exemplary embodiments of the present disclosure have been described in detail by way of illustration, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. The various exemplary embodiments disclosed herein may be combined in any combination without departing from the spirit and scope of the present disclosure. Those skilled in the art will also appreciate that various modifications may be made to the exemplary embodiments without departing from the scope and spirit of the disclosure. The scope of the present disclosure is defined by the appended claims.

Claims (18)

1. A temperature control device for a lens, characterized by comprising:

A heating member disposed around the lens;

A control part electrically connected to the heating part; and

A temperature sensing part embedded in the heating part and transmitting the sensed temperature of the heating part to the control part;

Wherein the control component generates a comparison signal indicative of a comparison of the temperature of the heating component and a first predetermined temperature, the control component controlling the current flowing from the power source to the heating component based on the comparison signal.

2. The temperature control device according to claim 1, wherein the control section disconnects the heating section from the power supply if the temperature of the heating section is higher than a first predetermined temperature, and couples the heating section to the power supply if the temperature of the heating section is less than the first predetermined temperature.

3. The temperature control device according to claim 1, wherein the control section disconnects the heating section from the power supply if the temperature of the heating section is higher than a first predetermined temperature, and adjusts the value of the electric current flowing from the power supply to the heating section according to the temperature of the heating section if the temperature of the heating section is less than the first predetermined temperature.

4. The temperature control device of claim 1, wherein the control component further comprises:

A collection and temperature control assembly coupled to the temperature sensing assembly, the collection and temperature control assembly comparing the temperature of the heating member sensed by the temperature sensing assembly with a first predetermined temperature and sending a comparison signal;

A heating switching circuit coupled to the comparator and further coupled between the power supply and the heating component, wherein the heating switching circuit receives the comparison signal sent by the comparator and disconnects or couples the heating component from the power supply based on the comparison signal.

5. The temperature control device of claim 4, wherein the heating switching circuit further comprises:

An NPN type triode, the base of which is coupled to the comparator to amplify the comparison signal from the comparator; and

A P-channel MOSFET having a gate coupled to the collector of the NPN transistor, a source coupled to a power source, and a drain connected to the heating block to disconnect or couple the heating block from the power source based on a signal from the collector of the NPN transistor.

6. The temperature control device according to claim 1, wherein the heating member is provided around a barrel of a lens.

7. The temperature control device of claim 1, wherein the heating member comprises a heating film region, a solder reinforcement region, a heating film pad, wherein the temperature sensing member is embedded in the heating film region of the heating member.

8. The temperature control device according to claim 1, wherein the heating member is a flexible heating film including an upper film, a heating wire, a lower film, wherein the heating wire is sandwiched between the upper film and the lower film and the upper film is closer to a lens barrel of the lens than the lower film.

9. The temperature control device of claim 8, wherein the upper membrane is a polyimide PI membrane and the lower membrane is an acrylic oligomer membrane.

10. The temperature control device according to claim 8, wherein the heating member is attached to a lens barrel of the lens through a gel layer, wherein the gel layer contacts an upper film.

11. The temperature control device of claim 1, wherein the temperature sensing component is a thermistor NTC.

12. The temperature control device of claim 1, wherein the first predetermined temperature is 40 ℃.

13. The temperature control device of claim 4, the heating switching circuit defaults to disconnecting the power supply and the heating element when the lens is initially powered up.

14. The temperature control device according to claim 1, the control part further electrically connected to an image sensor of the lens and receiving a temperature of the image sensor, wherein the power supply and the heating part are forcibly disconnected when the temperature of the image sensor is higher than a second predetermined temperature, which is higher than the first predetermined temperature.

15. The temperature control device of claim 14, wherein the second predetermined temperature is 90 ℃.

16. The temperature control device of claim 1, wherein the signal from the temperature sensing component is sampled by a control circuit and then analog-to-digital converted to obtain a real-time temperature.

17. A lens temperature control module comprises

The lens module comprises a lens; and

The temperature control device of any one of claims 1-16.

18. An unmanned aerial vehicle device comprising the lens temperature control module of claim 17.