CN211557344U

CN211557344U - Defogging camera module

Info

Publication number: CN211557344U
Application number: CN202020338840.XU
Authority: CN
Inventors: 张枫; 苏洪志
Original assignee: Shenzhen Union Optics Technology Co ltd
Current assignee: Shenzhen Union Optics Technology Co ltd
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2020-09-22
Anticipated expiration: 2030-03-18

Abstract

The utility model discloses a defogging camera module, its include the camera module and with camera module electric connection's heating circuit, heating circuit includes power, heating plate, operational amplifier circuit and thermistor, and heating plate and operational amplifier circuit all are connected with the power, and thermistor installs between power and operational amplifier circuit, adjusts the current size on the heating plate through thermistor operational amplifier circuit's power output for the heating plate can increase power when the temperature reduces, reduces power when the temperature rises. This application makes whole camera module in the in-process that uses in the refrigerator can change along with the change of temperature through add thermistor in heating circuit to whole module reaches constant temperature, neither influences the life of module and also can effectively defrost the defogging.

Description

Defogging camera module

Technical Field

The utility model relates to a video surveillance camera head technical field specifically is a be applied to defogging camera module under body temperature environment.

Background

Monitoring food condition and unmanned machine of selling all need install the camera in the refrigerator today, and camera module assembly can be because the temperature is low and frosting when low temperature environment such as refrigerator, also or open refrigerator door back room temperature air and run into back camera lens meeting warm air and form water smoke on the camera lens surface, therefore the camera module of installation need heat the defrosting for the camera lens under the low temperature environment, defogging makes its definition of guaranteeing the surveillance video.

In order to solve the problem that the lens frosts and fogs in the refrigerator due to low temperature of the refrigerator, the current method is to add a heating film in a module to remove fog and frost, but the temperature of the heating film changes along with the change of the temperature, so that the constant temperature effect is difficult to achieve; in addition, the method for defogging and defrosting by adding the heating film in the module has the problem that the service life of the module is shortened due to overhigh temperature in a normal-temperature environment or the surface of the lens is fogged and frosted due to unqualified temperature in a low-temperature environment.

SUMMERY OF THE UTILITY MODEL

The following presents a simplified summary of embodiments of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that the following summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.

According to an aspect of the application, a defogging camera module is provided, including the camera module and with camera module electric connection's heating circuit, heating circuit includes power, heating plate, operational amplifier circuit and thermistor, and heating plate and operational amplifier circuit all are connected with the power, and thermistor installs between power and operational amplifier circuit, adjusts the current size on the heating plate through thermistor regulation operational amplifier circuit's power output for the heating plate can increase power when the temperature reduces, reduces power when the temperature rises. This application is through adding thermistor in heating circuit, the electric current that makes in this part circuit during operation electric current reduces in higher ambient temperature, heating plate heating effect reduces, the electric current increases in low temperature environment, make the heating plate can high-power heating improve the effect of defrosting defogging, the in-process that makes whole camera module use in the refrigerator can change along with the change of temperature, thereby whole module reaches constant temperature, neither influence the life of module also can effectively defrost defogging.

Further, the heating circuit further comprises a voltage stabilizer, and the voltage stabilizer is connected between the thermistor and the operational amplifier circuit in series. Preferably, the voltage stabilizer is implemented by a single-channel low dropout linear voltage stabilizer with the model of EMP 8733.

As a specific implementation scheme, the operational amplifier circuit comprises a first operational amplifier and a second operational amplifier, wherein the positive input end and the negative input end of the first operational amplifier are respectively connected with an RC circuit in series and connected to the thermistor, and the positive input end and the negative input end of the second operational amplifier are respectively connected with an RC circuit in series and connected to the thermistor; the output end of the first operational amplifier and the output end of the second operational amplifier are both connected in series with a switching tube to be connected to a power supply.

Preferably, the switching tube is implemented by a semiconductor diode with model BAT 54C.

Preferably, the first operational amplifier and the second operational amplifier are implemented by a dual operational amplifier of type LM 358.

Preferably, the power supply is realized by a power supply chip with the model number of SOT23 and a follower circuit thereof.

Preferably, an LC circuit is connected in series between the power supply and the heating plate.

This application is through adding a heating plate in the camera lens department at the camera module, increases a thermistor in heating circuit and makes the heating plate can all can work with constant temperature along with service environment changes and control the heating plate, as long as temperature control can reach the effect of defrosting defogging at 35 ~ 40 degrees. The utility model discloses a metal thermistor reaches the heating plate temperature and can change along with ambient temperature changes, solves the camera lens better and works frosting, the problem of hazing under low temperature environment, has the design ingenious, and the advantage of easily realizing and promoting still has fine practicality.

Drawings

The invention may be better understood by referring to the following description taken in conjunction with the accompanying drawings. The accompanying drawings, which are incorporated in and form a part of this specification, illustrate preferred embodiments of the present invention and, together with the detailed description, serve to explain the principles and advantages of the invention.

Fig. 1 is a schematic circuit diagram of a heating circuit of the defogging camera module according to the present invention;

FIG. 2 is a graph showing an example of the relationship between the thermistor and the temperature.

Detailed Description

Embodiments of the present invention will be described below with reference to the accompanying drawings. It should be noted that the figures and descriptions have omitted, for the sake of clarity, the representation and description of components and processes that are not relevant to the present invention and known to those of ordinary skill in the art.

In the description of the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be interpreted broadly, for example, as mechanical or electrical connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

When the camera module is assembled in a refrigerator, frost is formed due to low temperature, and after the door of the refrigerator is opened, room-temperature air enters the camera module, and then the camera module meets warm air to form water mist on the surface of the camera module. The scheme of this application is that add a heating plate in camera lens department, increase a thermistor in the circuit and make the heating plate can all work with constant temperature along with service environment changes and control the heating plate, as long as temperature control can reach the effect of defrosting defogging at 35 ~ 40 degrees.

As a specific example, the utility model discloses a defogging camera module, including the camera module and with camera module electric connection's heating circuit.

Referring to fig. 1, the heating circuit includes a power supply, a heating plate, a voltage stabilizer, an operational amplifier circuit and a thermistor, the heating plate and the operational amplifier circuit are both connected with the power supply, the voltage stabilizer is connected in series between the thermistor and the operational amplifier circuit, and an LC circuit is connected in series between the power supply and the heating plate; the thermistor is arranged between the power supply and the operational amplifier circuit, and the current on the heating plate is adjusted by adjusting the power output of the operational amplifier circuit through the thermistor, so that the power of the heating plate can be increased when the temperature is reduced, and the power of the heating plate is reduced when the temperature is increased.

Wherein the thermistor is a metal thermistor. The current in the circuit can be controlled after the thermistor is added to the heating circuit, the temperature of the thermistor reaching the heating sheet can change along with the change of the environmental temperature (the temperature is reduced along with the rise of the environmental temperature and is increased along with the reduction of the environmental temperature), and the problems that the lens is frosted and fogged when working in a low-temperature environment are better solved.

The operational amplifier circuit comprises a first operational amplifier and a second operational amplifier, wherein the positive input end and the negative input end of the first operational amplifier are respectively connected with an RC (resistor-capacitor) circuit in series and connected to the thermistor, and the positive input end and the negative input end of the second operational amplifier are respectively connected with an RC circuit in series and connected to the thermistor; the output end of the first operational amplifier and the output end of the second operational amplifier are both connected in series with a switching tube to be connected to a power supply.

In this embodiment, the voltage regulator is implemented by a single-channel low dropout linear voltage regulator of the type EMP 8733. The switching tube is implemented by a semiconductor diode with model number BAT 54C. The first operational amplifier and the second operational amplifier are realized by a dual operational amplifier with model number LM 358. The power supply is realized by adopting a power supply chip with the model number of SOT23 and a follower circuit thereof.

This application makes whole camera module in the in-process that uses in the refrigerator can change along with the change of temperature through add thermistor in heating circuit to whole module reaches constant temperature, neither influences the life of module and also can effectively defrost the defogging. When the temperature-sensitive lens is used, the resistance value of the thermistor is increased along with the rise of the temperature, so that the resistance value of the lens is reduced at low temperature, the current is increased, and the lens can work at 35-40 ℃ at low temperature.

The existing heating circuit on the market only adjusts the temperature under the specific environment, so that the temperature is too high or too low when the environment temperature difference is too large. This application reaches the heating plate temperature through increasing metal thermistor in heating circuit and can change along with ambient temperature changes, makes the camera lens can maintain the constant temperature heating in the great environment of difference in temperature and reaches defrosting defogging effect and do not influence camera module life.

As shown in fig. 2, the heating circuit of this embodiment adjusts the current on the heating sheet by adjusting the power output of the operational amplifier through the thermistor, so that the power of the heating sheet can be increased when the temperature decreases, and the power of the heating sheet can be decreased when the temperature increases.

Use the utility model discloses the time, set up the heating plate at camera lens part, change the electric current in the circuit along with temperature variation by the thermistor in the circuit, finally make the module can maintain the effect that work reaches the defrosting defogging between 35 ~ 40 degrees. And a controllable circuit is used for supplying power to the heating sheet, so that the camera module can normally work at constant temperature in an environment of-10-40 ℃.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.

While the present invention has been disclosed above by the description of specific embodiments thereof, it should be understood that all of the embodiments and examples described above are illustrative and not restrictive. Various modifications, improvements or equivalents to the invention may be devised by those skilled in the art within the spirit and scope of the appended claims. Such modifications, improvements and equivalents are also intended to be included within the scope of the present invention.

Claims

1. The utility model provides a defogging camera module which characterized in that: the camera module comprises a camera module and a heating circuit electrically connected with the camera module;

the heating circuit comprises a power supply, a heating plate, an operational amplifier circuit and a thermistor, wherein the heating plate and the operational amplifier circuit are both connected with the power supply, the thermistor is arranged between the power supply and the operational amplifier circuit, and the current on the heating plate is adjusted by adjusting the power output of the operational amplifier circuit through the thermistor.

2. The defogging camera module set forth in claim 1, wherein: the heating circuit further comprises a voltage stabilizer which is connected in series between the thermistor and the operational amplifier circuit.

3. The defogging camera module set forth in claim 2, wherein: the voltage stabilizer is realized by adopting a single-channel low-dropout linear voltage stabilizer with the model of EMP 8733.

4. The defogging camera module group of any one of claims 1-3, wherein: the operational amplifier circuit comprises a first operational amplifier and a second operational amplifier, wherein the positive input end and the negative input end of the first operational amplifier are respectively connected with an RC (resistor-capacitor) circuit in series and connected to the thermistor, and the positive input end and the negative input end of the second operational amplifier are respectively connected with an RC circuit in series and connected to the thermistor; the output end of the first operational amplifier and the output end of the second operational amplifier are both connected in series with a switching tube to be connected to a power supply.

5. The defogging camera module set forth in claim 4, wherein: the switching tube is realized by a semiconductor diode with the model number BAT 54C.

6. The defogging camera module set forth in claim 4, wherein: the first operational amplifier and the second operational amplifier are realized by a dual operational amplifier with the model number LM 358.

7. The defogging camera module set forth in claim 1, wherein: the power supply is realized by adopting a power supply chip with the model number of SOT23 and a following circuit thereof.

8. The defogging camera module set forth in claim 1, wherein: and an LC circuit is connected between the power supply and the heating sheet in series.