CN118381986A - An anti-condensation camera and its shooting application in low temperature environment and high temperature environment - Google Patents
An anti-condensation camera and its shooting application in low temperature environment and high temperature environment Download PDFInfo
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- CN118381986A CN118381986A CN202410794989.1A CN202410794989A CN118381986A CN 118381986 A CN118381986 A CN 118381986A CN 202410794989 A CN202410794989 A CN 202410794989A CN 118381986 A CN118381986 A CN 118381986A
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- voltage power
- condensation
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- 238000009833 condensation Methods 0.000 title claims abstract description 52
- -1 polyethylene Polymers 0.000 claims abstract description 42
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000004698 Polyethylene Substances 0.000 claims abstract description 33
- 239000006230 acetylene black Substances 0.000 claims abstract description 33
- 229920000573 polyethylene Polymers 0.000 claims abstract description 33
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000009434 installation Methods 0.000 claims description 16
- 230000000903 blocking effect Effects 0.000 claims description 4
- 230000005494 condensation Effects 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 10
- 230000006378 damage Effects 0.000 description 7
- 229910001006 Constantan Inorganic materials 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient
- H01C7/027—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient consisting of conducting or semi-conducting material dispersed in a non-conductive organic material
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/55—Details of cameras or camera bodies; Accessories therefor with provision for heating or cooling, e.g. in aircraft
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/51—Housings
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/52—Elements optimising image sensor operation, e.g. for electromagnetic interference [EMI] protection or temperature control by heat transfer or cooling elements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/146—Conductive polymers, e.g. polyethylene, thermoplastics
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Ceramic Engineering (AREA)
- Studio Devices (AREA)
Abstract
The invention relates to an anti-condensation camera and shooting application thereof in low-temperature environment and high-temperature environment, comprising a bottom shell, a transparent housing, a constant voltage power supply and a PTC resistor, wherein a mounting cavity is formed by surrounding the bottom shell and the transparent housing, and the PTC resistor is arranged in the mounting cavity and is electrically connected to the constant voltage power supply; the transparent housing is made of PC or acrylic, the PTC resistor comprises polyethylene and acetylene black, the mass ratio of the polyethylene to the acetylene black is 85:15-90:10, and the voltage specification of the constant voltage power supply is not higher than 48V.
Description
Technical Field
The invention relates to the field of camera anti-condensation, in particular to an anti-condensation camera and shooting application thereof in a low-temperature environment and a high-temperature environment.
Background
The camera comprises a bottom shell, a transparent housing and a lens, wherein the bottom shell and the transparent housing enclose a mounting cavity, the lens is mounted in the mounting cavity, and the lens shoots the outer side of the camera through the transparent housing. Some cameras need to take pictures in extreme environments, which are usually represented by extreme temperatures (extremely cold or hot) and high humidity, which results in condensation on the transparent cover, which is very easy to form and causes degradation of the quality of the shooting of the lens.
The transparent cover is generally made of glass, PC or acrylic, and PC or acrylic is often used in view of cost. On the other hand, however, since the roughness of PC or acryl is greater than that of glass, the surface of the transparent cover made of PC or acryl is more likely to be exposed, which further aggravates the risk of exposure on the transparent cover in extreme environments.
Disclosure of Invention
Based on this, it is necessary to provide an anti-condensation camera and its shooting application in low temperature environment and high temperature environment, aiming at the problem that the transparent cover shell made of PC or acrylic material is easy to generate condensation under extreme environment, resulting in the degradation of the shooting quality of the camera.
The technical scheme provided by the invention is as follows:
The anti-condensation camera comprises a bottom shell, a transparent housing, a constant voltage power supply and a PTC resistor, wherein an installation cavity is formed by surrounding the bottom shell and the transparent housing, and the PTC resistor is arranged in the installation cavity and is electrically connected to the constant voltage power supply;
The transparent housing is made of PC or acrylic, the PTC resistor comprises polyethylene and acetylene black, the mass ratio of the polyethylene to the acetylene black is 85:15-90:10, and the voltage specification of the constant voltage power supply is not higher than 48V.
The PTC resistor is arranged on the inner wall of the transparent housing.
The PTC resistor is attached to the transparent cover.
The inner wall of the transparent housing is provided with the stop ring, and the PTC resistor is arranged on the inner wall of the transparent housing through the stop ring so as to be arranged at intervals with the transparent housing.
The anti-condensation camera also comprises a circuit board, wherein the constant voltage power supply and the PTC resistor are electrically connected to the circuit board, and the circuit board is arranged on the bottom shell and is positioned in the mounting cavity so that the circuit board and the PTC resistor are arranged at intervals.
The anti-condensation camera also comprises a lens, wherein the lens is positioned in the mounting cavity and faces the transparent housing, and the PTC resistor ring is arranged on the periphery of the lens.
The lens is electrically connected to the constant voltage power supply.
The utility model provides a prevent shooting application of condensation camera in low temperature environment, installation cavity outside temperature is less than 0 ℃.
The voltage specification of the constant voltage power supply is not higher than 5V.
The utility model provides a prevent shooting application of condensation camera in high temperature environment, installation cavity outside temperature is not less than 50 ℃.
The beneficial effects of the invention at least comprise one of the following:
1. The PTC resistor is made of polyethylene and acetylene black in a mass ratio of 85:15-90:10, and even if the PTC resistor heats under 48V high-voltage conditions and extremely high-temperature environments, the temperature of the PTC resistor is not higher than 100 ℃, so that the damage of a transparent housing made of PC or acrylic materials is avoided, and the limit of the PTC resistor on the specification of constant-voltage power supply voltage can be avoided;
2. Under the low-temperature environment and the low-pressure condition of 5V, the PTC resistor made of polyethylene and acetylene black in the mass ratio of 85:15-90:10 can enable the temperature of the inner wall surface of the transparent housing made of PC or acrylic material to be near or higher than the condensation point, so that the generation of condensation is reduced or inhibited, and the shooting quality of the anti-condensation camera is ensured.
Drawings
Fig. 1 is a schematic cross-sectional view of an anti-condensation camera according to embodiment 1 of the present invention;
fig. 2 is a schematic top view of the PTC resistor of embodiment 1 of the present invention;
Fig. 3 is a schematic cross-sectional view of the PTC resistor of embodiment 1 of the present invention;
fig. 4 is a graph showing the temperature of the PTC resistor with time in reference example 1-reference example 4 of the present invention;
Fig. 5 is a temperature-time-dependent curve of PTC resistor in reference example 5-reference example 8 according to the present invention;
Fig. 6 is a temperature-time-dependent curve of PTC resistor in reference example 9-reference example 10 according to the present invention;
fig. 7 is a graph showing the temperature of PTC resistor with time in reference example 11-reference example 12 of the present invention;
FIG. 8 is a graph showing the temperature of the inner and outer walls of the transparent cover in example 2 of the present invention over time;
FIG. 9 is a photograph of an anti-condensation camera according to example 2 of the present invention;
FIG. 10 is a graph showing the temperature of the inner and outer walls of the transparent cover in example 3 of the present invention over time;
FIG. 11 is a photograph of an anti-condensation camera according to example 3 of the present invention;
FIG. 12 is a graph showing the temperature of the inner wall and the outer wall of the transparent cover in comparative example 1 of the present invention with time;
FIG. 13 is a photograph of an anti-condensation camera according to comparative example 1 of the present invention;
FIG. 14 is a graph showing the temperature of the inner and outer walls of the transparent cover in example 4 of the present invention over time;
FIG. 15 is a photograph of an anti-condensation camera according to example 4 of the present invention;
FIG. 16 is a graph showing the temperature of the inner and outer walls of the transparent enclosure of example 5 of the present invention over time;
FIG. 17 is a photograph of an anti-condensation camera according to example 5 of the present invention;
FIG. 18 is a graph showing the temperature of the inner wall, the outer wall and the constantan wire of the transparent cover in comparative example 2 according to the present invention;
fig. 19 is a photograph of the anti-condensation camera of comparative example 2 of the present invention.
Reference numerals:
1. a bottom case; 2. a transparent cover; 3. a lens; 4. a PTC resistor; 5. a constant voltage power supply; 6. an insulating layer; 7. an upper polar plate; 8. a lower polar plate; 9. and connecting the base materials.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Example 1:
Referring to fig. 1 and 2, the present embodiment provides an anti-condensation camera, which includes a bottom case 1, a transparent cover 2, a lens 3, a constant voltage power supply 5, and a PTC resistor 4.
Wherein, the bottom shell 1 and the transparent housing 2 enclose to form an installation cavity, and the lens 3, the constant voltage power supply 5 and the PTC resistor 4 are all arranged in the installation cavity.
For a general camera, the transparent housing 2 is usually made of glass, PC or acryl. In this embodiment, the transparent cover 2 is made of one of PC and acryl, which is because the cost of PC and acryl is far lower than that of glass under the same thickness condition. However, it should be noted that the surface roughness of PC and acrylic is higher than that of glass, so that the problem of condensation is more likely to occur in PC and acrylic than in glass.
The transparent housing 2 is hemispherical, and the lens 3 is arranged towards the center of the side wall of the transparent housing 2 so as to shoot the outer side of the installation cavity through the transparent housing 2. Accordingly, the transparent cover 2 may reduce the photographing quality of the lens 3 regardless of whether the outer wall surface or the inner wall surface is condensed.
For the existing monitoring cameras, the lenses 3 with different specifications have different maximum withstand voltages, and the maximum value of the maximum withstand voltage in all the lenses 3 in the market is 48V. In this embodiment, the lens 3 is electrically connected to the constant voltage power supply 5, and the shooting process of the lens 3 is achieved by supplying power to the constant voltage power supply 5, and the voltage specification of the constant voltage power supply 5 should be matched with the actual withstand voltage of the lens 3. In compliance with this, the power supply specification of the constant voltage power supply 5 should not be higher than 48V.
The heat exchange can be carried out between the inside and the outside of the installation cavity through the transparent housing 2, if no electricity is supplied to the installation cavity, the joule heat can not be generated in the installation cavity, and accordingly, the inside and the outside of the installation cavity can reach the same temperature after the sufficient heat exchange. Conversely, if the PTC resistor 4 is supplied with power, joule heat is generated from the PTC resistor 4, and thus the inside and outside of the installation cavity tend not to reach thermal equilibrium in the form of the same temperature.
The PTC resistor 4 of this embodiment is electrically connected to the constant voltage power supply 5, and the constant voltage power supply 5 supplies power to the PTC resistor 4. The PTC resistor 4 and the lens 3 are connected in parallel, and then the PTC resistor 4 and the lens 3 are powered by only one constant voltage power supply 5, so that the space occupation of the power supply in the installation cavity is reduced. The constant voltage power supply 5 can provide a fixed voltage to the PTC resistor 4 or a stable voltage floating in a small range, so that the PTC resistor 4 continuously generates heat, and the temperature of the PTC resistor 4 itself rises.
The PTC resistor 4 is characterized in that the resistance of the PTC resistor 4 gradually increases as the temperature thereof increases, and the PTC resistor 4 is powered by the constant voltage power supply 5, so that the PTC resistor 4 is continuously heated as the power supply time of the constant voltage power supply 5 increases, the resistance of the PTC resistor 4 is continuously increased in the process, and accordingly, the heating power of the PTC resistor 4 is gradually reduced until the heating power conducted to the outside of the transparent housing 2 and the heating power of the PTC resistor 4 are balanced, and finally the PTC resistor 4 can maintain a relatively constant temperature, resistance and heating power.
Since air is a poor conductor of heat, it is necessary to dispose the PTC resistor 4 on the inner wall of the transparent casing 2 and to attach the PTC resistor to the inner wall of the transparent casing 2, so that the heat generated by the PTC resistor 4 is directly transferred to the transparent casing 2 as much as possible, and the temperature of the inner wall surface and the outer wall surface of the transparent casing 2 is further raised to the maximum.
In other embodiments, a stop ring may be provided on the inner wall of the transparent casing 2, and the PTC resistor 4 may be mounted on the light blocking ring, so that the PTC resistor 4 and the transparent casing 2 can maintain a certain distance. Referring to fig. 2 and 3, in these embodiments, the anti-condensation camera further includes an insulating layer 6, an upper plate 7, a lower plate 8, and a connection substrate 9, where the insulating layer 6, the upper plate 7, the PTC resistor 4, the lower plate 8, and the connection substrate 9 are sequentially layered, the upper plate 7 and the lower plate 8 are respectively connected to the positive and negative electrodes of the constant voltage power supply 5, and the connection substrate 9 is adhered to the light blocking ring. In these embodiments, the anti-condensation camera further includes a circuit board, which may be mounted on the bottom case 1, to which the lens 3, the constant voltage power supply 5, and the PTC resistor 4 are electrically connected. The PTC resistor 4 is electrically connected to the circuit board through the upper polar plate 7 and the lower polar plate 8 so as to avoid direct contact between the PTC resistor 4 and the circuit board, the circuit board and the PTC resistor 4 are arranged at intervals, and the poor heat conductor property of air between the circuit board and the PTC resistor 4 is utilized to inhibit heat conduction of the PTC resistor 4 to the circuit board.
Further preferably, the PTC resistor 4 is ring-shaped, and the PTC resistor 4 is disposed around the circumference of the lens 3, whereby the portion of the transparent casing 2 that is subjected to heat conduction by the PTC resistor 4 is concentrated in the photographing range of the lens 3.
Reference example 1:
the present reference embodiment provides the constant voltage power supply 5 and the PTC resistor 4, both ends of the PTC resistor 4 being electrically connected to the positive and negative electrodes of the constant voltage power supply 5, respectively. Wherein the PTC resistor 4 comprises polyethylene and acetylene black, the mass ratio of the polyethylene to the acetylene black is 85:15, the working voltage of the constant voltage power supply 5 is 5V, and the ambient temperature is 25 ℃.
Reference example 2:
The present reference embodiment provides the constant voltage power supply 5 and the PTC resistor 4, both ends of the PTC resistor 4 being electrically connected to the positive and negative electrodes of the constant voltage power supply 5, respectively. Wherein the PTC resistor 4 comprises polyethylene and acetylene black, the mass ratio of the polyethylene to the acetylene black is 90:10, the working voltage of the constant voltage power supply 5 is 5V, and the ambient temperature is 25 ℃.
Reference example 3:
The present reference embodiment provides the constant voltage power supply 5 and the PTC resistor 4, both ends of the PTC resistor 4 being electrically connected to the positive and negative electrodes of the constant voltage power supply 5, respectively. Wherein the PTC resistor 4 is made of constantan wires, the working voltage of the constant voltage power supply 5 is 5V, and the ambient temperature is 25 ℃.
Reference example 4:
The present reference embodiment provides the constant voltage power supply 5 and the PTC resistor 4, both ends of the PTC resistor 4 being electrically connected to the positive and negative electrodes of the constant voltage power supply 5, respectively. Wherein the PTC resistor 4 is made of platinum metal, the working voltage of the constant voltage power supply 5 is 5V, and the ambient temperature is 25 ℃.
Referring to fig. 4, in reference example 1-reference example 4, as the power supply time of the constant voltage power supply 5 increases, the temperature of all PTC resistors 4 is generally stable after a period of time, and the temperature after the stabilization is lower than 100 ℃, which accords with the tolerance temperature of PC or acryl.
Reference example 5:
The present reference embodiment provides the constant voltage power supply 5 and the PTC resistor 4, both ends of the PTC resistor 4 being electrically connected to the positive and negative electrodes of the constant voltage power supply 5, respectively. Wherein the PTC resistor 4 comprises polyethylene and acetylene black, the mass ratio of the polyethylene to the acetylene black is 85:15, the working voltage of the constant voltage power supply 5 is 12V, and the ambient temperature is 25 ℃.
Reference example 6:
The present reference embodiment provides the constant voltage power supply 5 and the PTC resistor 4, both ends of the PTC resistor 4 being electrically connected to the positive and negative electrodes of the constant voltage power supply 5, respectively. Wherein the PTC resistor 4 comprises polyethylene and acetylene black, the mass ratio of the polyethylene to the acetylene black is 90:10, the working voltage of the constant voltage power supply 5 is 12V, and the ambient temperature is 25 ℃.
Reference example 7:
The present reference embodiment provides the constant voltage power supply 5 and the PTC resistor 4, both ends of the PTC resistor 4 being electrically connected to the positive and negative electrodes of the constant voltage power supply 5, respectively. Wherein the PTC resistor 4 is made of constantan wires, the working voltage of the constant voltage power supply 5 is 12V, and the ambient temperature is 25 ℃.
Reference example 8:
The present reference embodiment provides the constant voltage power supply 5 and the PTC resistor 4, both ends of the PTC resistor 4 being electrically connected to the positive and negative electrodes of the constant voltage power supply 5, respectively. Wherein the PTC resistor 4 is made of platinum metal, the working voltage of the constant voltage power supply 5 is 12V, and the ambient temperature is 25 ℃.
Referring to fig. 5, in reference example 5-reference example 8, as the supply time of the constant voltage power supply 5 increases, the temperature of all PTC resistors 4 is substantially maintained stable after a period of rising. In reference example 5 and reference example 6, the temperature of the PTC resistor 4 was lower than 100 ℃ after stabilization, and in reference example 7 and reference example 8, the temperature of the PTC resistor 4 was higher than 100 ℃ after stabilization, exceeding the tolerance temperature of PC or acryl. In other words, the PTC resistor 4 in reference example 7 and reference example 8 cannot work in cooperation with the lens 3 having a withstand voltage higher than 12V at room temperature.
Reference example 9:
the present reference embodiment provides the constant voltage power supply 5 and the PTC resistor 4, both ends of the PTC resistor 4 being electrically connected to the positive and negative electrodes of the constant voltage power supply 5, respectively. Wherein the PTC resistor 4 comprises polyethylene and acetylene black, the mass ratio of the polyethylene to the acetylene black is 85:15, the working voltage of the constant voltage power supply 5 is 48V, and the ambient temperature is 25 ℃.
Reference example 10:
The present reference embodiment provides the constant voltage power supply 5 and the PTC resistor 4, both ends of the PTC resistor 4 being electrically connected to the positive and negative electrodes of the constant voltage power supply 5, respectively. Wherein the PTC resistor 4 comprises polyethylene and acetylene black, the mass ratio of the polyethylene to the acetylene black is 90:10, the working voltage of the constant voltage power supply 5 is 48V, and the ambient temperature is 25 ℃.
Referring to fig. 6, in reference example 9-reference example 10, the PTC resistor 4 has a stable temperature of less than 100 ℃ and meets the tolerance temperature requirement of PC or acryl.
Reference example 11:
The present reference embodiment provides the constant voltage power supply 5 and the PTC resistor 4, both ends of the PTC resistor 4 being electrically connected to the positive and negative electrodes of the constant voltage power supply 5, respectively. Wherein the PTC resistor 4 comprises polyethylene and acetylene black, the mass ratio of the polyethylene to the acetylene black is 85:15, the working voltage of the constant voltage power supply 5 is 48V, and the ambient temperature is 55 ℃.
Reference example 12:
The present reference embodiment provides the constant voltage power supply 5 and the PTC resistor 4, both ends of the PTC resistor 4 being electrically connected to the positive and negative electrodes of the constant voltage power supply 5, respectively. Wherein the PTC resistor 4 comprises polyethylene and acetylene black, the mass ratio of the polyethylene to the acetylene black is 90:10, the working voltage of the constant voltage power supply 5 is 48V, and the ambient temperature is 55 ℃.
Referring to fig. 7, in reference example 11-reference example 12, the stable temperature of the PTC resistor 4 was lower than 100 ℃, satisfying the tolerance temperature requirement of PC or acryl.
As can be seen from the combination of reference examples 1-12, as long as the voltage specification of the constant voltage power supply 5 is not greater than the maximum withstand voltage of the lens 3 in the existing market, the PTC resistor 4 prepared from polyethylene and acetylene black in a mass ratio of 85:15-90:10 can be applied to the inside of the camera, no matter in a room temperature environment or a high temperature environment, and will not cause damage to the transparent housing 2 made of PC or acrylic material.
On the contrary, the PTC resistor 4 is made of platinum or constantan wire, and can not be used by matching with the lens 3 with the maximum withstand voltage larger than 12V only under the condition of room temperature, which leads to the use scene of the camera and the selection specification of the lens 3 to be greatly limited, as far as the use under the high-temperature shooting environment is concerned.
Example 2:
The difference between this embodiment and embodiment 1 is that the PTC resistor 4 comprises polyethylene and acetylene black, wherein the mass ratio of polyethylene to acetylene black is 85:15, wherein the maximum withstand voltage of the lens 3 is 5V, and the voltage specification of the constant voltage power supply 5 is 5V, and the ambient temperature is reduced from room temperature to-35 ℃.
Referring to fig. 8, as the ambient temperature gradually decreases, the temperature of both the inner wall and the outer wall of the transparent casing 2 gradually decrease, and eventually, the temperature of both the inner wall and the outer wall of the transparent casing 2 reaches an equilibrium state. Wherein the temperature of the inner central wall of the transparent housing 2 is balanced around 0 ℃ and the temperature of the outer central wall is balanced around-8 ℃. In this embodiment, the relative humidity inside the transparent housing 2 is about 35% rh, and the condensation temperature of the corresponding inner wall surface of the transparent housing 2 is about-8 ℃, so that the inner wall temperature of the transparent housing 2 is higher than the condensation point at this time. Referring to fig. 9, when the temperature balance is reached, the center of the surface of the transparent cover 2 does not generate a fogging phenomenon, and the photographing range of the lens 3 is not blocked by the fog, so that normal photographing is enabled. Therefore, the anti-condensation camera can meet the anti-condensation requirement with lower power consumption under the extremely low temperature environment and the low working voltage condition.
Example 3:
The difference between this embodiment and embodiment 1 is that the PTC resistor 4 comprises polyethylene and acetylene black, wherein the mass ratio of polyethylene to acetylene black is 90:10, wherein the maximum withstand voltage of the lens 3 is 5V, and the voltage specification of the constant voltage power supply 5 is 5V, and the ambient temperature is reduced from room temperature to-35 ℃.
Referring to fig. 10, as the ambient temperature gradually decreases, the temperature of both the inner wall and the outer wall of the transparent casing 2 gradually decrease, and eventually, the temperature of both the inner wall and the outer wall of the transparent casing 2 reaches an equilibrium state. Wherein the temperature of the inner central wall of the transparent housing 2 is balanced around-12 ℃ and the temperature of the outer central wall is balanced around-21 ℃. In this embodiment, the relative humidity inside the transparent housing 2 is about 35% rh, and the condensation temperature of the corresponding inner wall surface of the transparent housing 2 is about-8 ℃, so that the inner wall temperature of the transparent housing 2 is slightly lower than the condensation point. Referring to fig. 11, when the temperature balance is reached, a slight fogging phenomenon is generated in the center of the surface of the transparent cover 2, the photographing range of the lens 3 is slightly blocked by the fog, and the lens 3 can still perform photographing normally. Therefore, the anti-condensation camera of the embodiment can not cause damage of the transparent housing 2 under the extremely low temperature environment and the low working voltage condition, and the anti-condensation performance can basically meet shooting requirements.
Comparative example 1:
The difference between the present comparative example and example 1 is that the PTC resistor 4 is made of constantan wire, wherein the maximum withstand voltage of the lens 3 is 5V, and the voltage specification of the constant voltage power supply 5 is 5V, and the ambient temperature is-35 ℃.
Referring to fig. 12, as the ambient temperature gradually decreases, the temperature of both the inner wall and the outer wall of the transparent casing 2 gradually decrease, and eventually, the temperature of both the inner wall and the outer wall of the transparent casing 2 reaches an equilibrium state. Wherein the temperature of the inner central wall of the transparent housing 2 is balanced around-25 ℃ and the temperature of the outer central wall is balanced around-29 ℃. In this embodiment, the relative humidity of the inner side of the transparent housing 2 is about 35% rh, the condensation temperature of the inner wall surface of the corresponding transparent housing 2 is about-8 ℃, and the inner wall temperature of the transparent housing 2 is far lower than the condensation temperature. Referring to fig. 13, when the temperature balance is reached, the center of the surface of the transparent cover 2 is fogged more seriously than in example 3, and the photographing range of the lens 3 is completely blocked by the fog, and thus the normal photographing is impossible. From this, it is proved that the anti-condensation camera of the present comparative example does not cause damage to the transparent cover 2 under the extremely low temperature environment and the low operating voltage condition, but it is difficult to satisfy the anti-condensation requirement.
It is easily understood that in the anti-condensation camera, the transparent cover 2 causes a thermal field around the PTC resistor 4 to change, which results in that the transparent cover 2 and the PTC resistor 4 do not achieve a thermal balance at the same temperature even in the attached state, which results in a great uncertainty in the actual temperature of the transparent cover 2. In order to investigate the state of the transparent housing 2 under high ambient temperature and high operating voltage conditions, example 4, example 5 and comparative example 2 were additionally provided.
Example 4:
The difference between this embodiment and embodiment 1 is that the PTC resistor 4 comprises polyethylene and acetylene black, wherein the mass ratio of polyethylene to acetylene black is 85:15, wherein the maximum withstand voltage of the lens 3 is 48V, and the voltage specification of the constant voltage power supply 5 is 48V, and the ambient temperature is 55 ℃.
Referring to fig. 14 and 15, both the central inner wall and the central outer wall of transparent casing 2 are below 100 ℃ in the state of thermal equilibrium, transparent casing 2 does not show any damage.
Example 5:
The difference between this embodiment and embodiment 1 is that the PTC resistor 4 comprises polyethylene and acetylene black, wherein the mass ratio of polyethylene to acetylene black is 90:10, wherein the maximum withstand voltage of the lens 3 is 48V, and the voltage specification of the constant voltage power supply 5 is 48V, and the ambient temperature is 55 ℃.
Referring to fig. 16 and 17, the central inner wall and the central outer wall of the transparent casing 2 are also below 100 ℃ in the state of thermal equilibrium, and the transparent casing 2 does not show any damage.
Comparative example 2:
The difference between the present comparative example and example 1 is that the PTC resistor 4 is made of constantan wire, wherein the maximum withstand voltage of the lens 3 is 24V, and the voltage specification of the constant voltage power supply 5 is 24V, and the ambient temperature is 55 ℃.
Referring to fig. 18 and 19, the PTC resistor 4 rapidly increases in temperature to about 240 ℃ to cause premature melting and destruction of the portion of the transparent casing 2 contacting the PTC resistor 4 at the peripheral side of the central inner wall thereof. Accordingly, the final temperature of the portion of the central inner wall of the transparent casing 2 which is not in direct contact with the PTC resistor 4 is balanced at about 100 ℃.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
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| CN202410794989.1A CN118381986B (en) | 2024-06-19 | 2024-06-19 | Anti-condensation camera and shooting application thereof in low-temperature environment and high-temperature environment |
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