Image recognition equipment with electroplating heating circuit

Abstract

The utility model relates to image recognition equipment with an electroplating heating circuit, a heating coating is arranged on a transparent screen of the equipment, and the balance of internal and external temperatures is realized through two thermistors for monitoring internal and external environments in the electroplating heating circuit. When the temperature outside the equipment is lower than the temperature inside the equipment, due to the resistance value difference of the two thermistors, the input current of the driving tube Q1 is increased, the driving current is increased, the heating power of the heating coating is increased, and water mist or water vapor inside the equipment is eliminated. Along with the balance of internal and external temperatures, the resistance values of the two thermistors tend to be the same until the driving tube Q1 is closed, and heating is stopped. The scheme is simple, reliable in logic and low in cost, and facilitates the arrangement of miniaturized image recognition equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of circuit, in particular to an image recognition device with electroplating heating circuit. BACKGROUND

[0002] In recent years, with the wide use of image recognition technology, including bar code reading devices, monitoring devices, face recognition devices, machine vision devices are more and more used in logistics, warehousing, security and other fields. However, with the increase of outdoor, cold chain warehousing logistics and other scenes, more and more image recognition devices are facing the problem of not working normally in harsh environments. Especially in the face of high and low temperature difference, heavy rain, snow, hail and other extreme weather, after long time use of the device, external moisture penetrates into the interior of the device through the exhaust valve, internal and external interface or structural gap, and further produces cold water, which affects the reading effect, and even damages the device.

[0003] In the prior art, two methods are used to solve the above problems, one is to improve the sealing level of the device to minimize the transmission path with the outside air, but this method is high in cost and poor in effect, because the image recognition device needs to transmit the image data obtained to the host computer, which inevitably involves the transmission interface. The transmission interface is difficult to seal at a high level, and with the aging of the device, it is easy to produce gaps in structure and introduce external air. The other is to add a heating component to evaporate the condensed water, which generally uses manual or timing switch to trigger defogging and water removal, but this method requires manual intervention at the right time, and the timing switch cannot achieve the effect in a short time, and in a long time, it will overheat and increase power consumption. In addition, an automatic temperature controller module is also used for monitoring, but the current automatic temperature controller module is not good at miniaturization and is difficult to cope with small window devices. And it is difficult to fine-tune according to different devices, and the cost of relatively simple components is still high. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to solve the above problems of the prior art, and to provide an image recognition device with electroplating heating circuit.

[0005] To solve the above technical problems, the technical solution adopted by the present application is:

[0006] Technical scheme one

[0007] An image recognition device with electroplating heating circuit, comprising:

[0008] Screen: the screen is located on the front panel of the image recognition device, facing the reading window;

[0009] Heating plating layer: the heating plating layer is located on the screen;

[0010] Electroplating heating circuit: the electroplating heating circuit comprises an Rntc1 resistor, an Rntc2 resistor, an R1 base limiting resistor, and a driving tube Q1;

[0011] The electroplating heating circuit supplies power to the heating plating layer through the Rntc1 resistor and the Rntc2 resistor, and the driving tube Q1, and heats the transparent screen until the temperature is balanced.

[0012] The electroplating heating circuit specifically comprises:

[0013] The Rntc1 resistor is located on the transparent screen and connected to a Vcc input at one end.

[0014] The Rntc2 resistor is located in the shell behind the transparent screen, connected to the Rntc1 resistor at one end, and grounded at the other end.

[0015] The R1 base limiting resistor is connected in parallel with the Rntc2 resistor at one end and the Rntc1 resistor at the other end.

[0016] The driving tube Q1 has its B pole connected to the other end of the R1 base limiting resistor, its C pole connected to a Vdd through the heating plating layer, and its E pole grounded.

[0017] The Rntc1 resistor and the Rntc2 resistor are NTC thermistors with a negative temperature system characteristic, that is, the resistance increases when the temperature decreases and the resistance decreases when the temperature increases.

[0018] When the temperature of the transparent screen is lower than the internal temperature of the device, the resistance of the Rntc1 resistor increases, the resistance of the Rntc2 resistor decreases, the input control voltage Vi increases, the input current of the driving tube Q1 increases, the driving current of the driving tube Q1 to the heating plating layer increases, and the heating power of the heating plating layer increases; when the temperature of the transparent screen increases, the resistance of the Rntc1 resistor continuously decreases, and the driving current of the driving tube Q1 gradually decreases until the driving tube Q1 is turned off.

[0019] The image recognition device comprises a bar code reading device, a face recognition device, a machine vision device, and a monitoring device.

[0020] The material of the transparent screen comprises glass, acrylic, PP, and PC.

[0021] The image recognition device with electroplating heating circuit of the present application uses the electroplating heating screen technology to design a solution to eliminate the low temperature condensation of the inner wall. After sampling the temperature value parameter through the NTC resistance on the screen, the driving tube control current can be adjusted, and then the heating driving is controlled to act or not, so that the condensation condition is not met or the formed water mist is eliminated. The driving logic is simple, the solution is reliable, the cost is low, and it is easy to use in different sizes of equipment. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The device internal schematic diagram of an embodiment of the present application;

[0023] Figure 2 The schematic diagram of the electroplating heating circuit of an embodiment of the present application; DETAILED DESCRIPTION

[0024] The present application will be described in detail below in combination with the drawings and specific embodiments.

[0025] Embodiment 1

[0026] As shown in Figure 1 and Figure 2 , an image recognition device with electroplating heating circuit comprises:

[0027] Screen: the screen is located on the front panel of the image recognition device, facing the reading window.

[0028] Heating plating layer: the heating plating layer is located on the screen.

[0029] In this embodiment, the heating plating layer is composed of heating wires, which are pasted on the screen and distributed in a ring shape along the edge of the screen. In another embodiment, the screen is inlaid with a transparent heating plating layer.

[0030] Electroplating heating circuit: the electroplating heating circuit comprises Rntc1 resistance, Rntc2 resistance, R1 base limiting resistance, and driving tube Q1.

[0031] The electroplating heating circuit supplies power to the heating plating layer through the Rntc1 resistance and Rntc2 resistance, because the temperature difference between the inside and outside of the device causes the resistance values of the two resistances to be different, and then the driving tube Q1 is used to heat the screen until the temperature is balanced.

[0032] The electroplating heating circuit specifically comprises:

[0033] The Rntc1 resistance is located on the screen, and one end is connected to the Vcc input.

[0034] The Rntc2 resistance is located in the shell behind the screen, one end is connected to the Rntc1 resistance, and one end is grounded.

[0035] R1 base limit resistor, one end of which is connected in parallel with the Rntc2 resistor to the Rntc1 resistor;

[0036] The other end of the R1 base limit resistor is connected to the B electrode of the driving tube Q1, the C electrode is connected to Vdd through the heating plating layer, and the E electrode is grounded.

[0037] The Rntc1 resistor and the Rntc2 resistor are NTC thermistors, which have a negative temperature system characteristic, that is, when the temperature decreases, the resistance becomes larger, and when the temperature increases, the resistance becomes smaller.

[0038] When the screen temperature is lower than the internal temperature of the device, the resistance of the Rntc1 resistor becomes larger, and the resistance of the Rntc2 resistor becomes smaller, the input control voltage Vi increases, so that the input current of the driving tube Q1 becomes larger, and then the driving current output to the heating plating layer becomes larger, so that the heating power of the heating plating layer increases; when the screen temperature increases, the resistance of the Rntc1 resistor continuously becomes smaller, and the driving current of the driving tube Q1 is gradually reduced until it is turned off.

[0039] In the embodiment, the resistance temperature calculation formula is: Rt=R*EXP(B*(1 / T1-1 / T2)) where T1 and T2 are in K degrees, that is, Kelvin temperature (K=℃+273.15). Rt is the resistance value of the thermistor at T1 temperature; R is the nominal resistance value of the thermistor at T2 normal temperature (usually 25℃).

[0040] The image recognition device includes a bar code reading device, a face recognition device, a machine vision device, and a monitoring device.

[0041] The material used in the screen includes glass, acrylic, PP, and PC.

[0042] The above embodiments are only for illustration and not limitation of the present application, so any equivalent changes or modifications made to the method described in the scope of the present patent application are included in the scope of the present patent application.

Claims

1. An image recognition device with an electroplating heating circuit, characterized in that, include: Transparent screen: The transparent screen is located on the front panel of the image recognition device, directly facing the reading window; Heated coating: The heated coating is located on the transparent screen; Electroplating heating circuit: The electroplating heating circuit includes resistor Rntc1, resistor Rntc2, R1 base current limiting resistor, and drive transistor Q1; The electroplating heating circuit supplies power to the heating coating through the Rntc1 resistor and the Rntc2 resistor. Due to the temperature difference between the inside and outside of the equipment, the two resistors have different resistance values. The heating is then supplied through the drive tube Q1 to heat the screen until the temperature reaches equilibrium. Specifically, the electroplating heating circuit is as follows: The Rntc1 resistor is located on the transparent screen, with one end connected to the Vcc input; The Rntc2 resistor is located inside the housing behind the transparent screen, with one end connected to the Rntc1 resistor and the other end grounded. R1 is a base current limiting resistor, one end of which is connected in parallel with the Rntc2 resistor to the Rntc1 resistor; The drive transistor Q1 has its base (B) connected to the other end of the current-limiting resistor R1, its collector (C) connected to Vdd through the heating coating, and its emitter (E) grounded.

2. The image recognition device with an electroplating heating circuit according to claim 1, characterized in that: The Rntc1 and Rntc2 resistors are NTC thermistors, which have negative temperature system characteristics. When the temperature decreases, the resistance increases, and when the temperature increases, the resistance decreases.

3. The image recognition device with an electroplating heating circuit according to claim 2, characterized in that, When the transparent screen temperature is lower than the internal temperature of the device, the resistance of the Rntc1 resistor increases while the resistance of the Rntc2 resistor decreases, the input control voltage Vi increases, which in turn increases the input current of the driving transistor Q1, thereby increasing the driving current output to the heating coating and increasing the heating power of the heating coating. When the transparent screen temperature rises, the resistance of the Rntc1 resistor continuously decreases, further gradually reducing the driving current of the driving transistor Q1 until it is turned off.

4. The image recognition device with an electroplating heating circuit according to claim 1, characterized in that: The image recognition equipment includes barcode reading equipment, face recognition equipment, machine vision equipment, and monitoring equipment.

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