Camera

Abstract

An embodiment of the present application provides a camera, which includes a lens assembly, a spherical core cover, a transparent cover, a heating element, a light-shielding element, and a heat-insulating element. The spherical core cover is arranged on the lens assembly. The transparent cover is arranged outside the spherical core cover, and a receiving space is provided between the transparent cover and the spherical core cover. The front end of the lens assembly extends out of the spherical core cover and into the receiving space. The heating element is located in the receiving space and surrounds the front end of the lens assembly. The light-shielding element is arranged on the inner surface of the transparent cover and is located outside the field of view of the lens assembly. The heat-insulating element is located in the receiving space, surrounds the front end of the lens assembly, and is fixed between the light-shielding element and the spherical core cover. The heating element is fixed to the heat-insulating element, and the heat-insulating element isolates the heating element from the light-shielding element. The camera of the present application has good defogging effect and good shooting effect.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of electronic equipment, and in particular to a camera. Background Art

[0002] When a camera is in use, the air inside the cavity experiences a certain temperature rise due to heat generated by the components. When the ambient temperature is low, the air inside the cavity cools down at the viewport glass and may condense into fog. Some camera glass defogging solutions add heating to the viewport glass. However, for hemispherical cameras, the conventional transparent cover is made of plastic, which has poor thermal conductivity and high-temperature resistance. Direct heating is not possible, thus failing to resolve the fogging issue. Other camera glass defogging solutions place the heating device on the base and use a fan to force convection to blow hot air toward the viewport. However, due to the unconcentrated heat, stable defogging is difficult to achieve. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a camera with better defogging function.

[0004] One aspect of an embodiment of the present application provides a camera, including:

[0005] lens assembly;

[0006] A spherical core cover, which is arranged on the lens assembly;

[0007] a transparent cover, which is arranged outside the spherical core cover and has a receiving space between the cover and the spherical core cover, and the front end of the lens assembly extends out of the spherical core cover and into the receiving space;

[0008] a heating element, located in the receiving space and surrounding the front end of the lens assembly;

[0009] a light shielding member, disposed on the inner surface of the transparent cover and located outside the field of view of the lens assembly; and

[0010] A heat insulating member is located in the receiving space, surrounds the front end of the lens assembly, and is fixed between the light shielding member and the spherical core cover. The heating member is fixed to the heat insulating member, and the heat insulating member isolates the heating member and the light shielding member.

[0011] Optionally, the thermal insulation member covers the side of the heating member axially facing the spherical core cover and covers the side of the heating member radially away from the lens assembly, and the side of the heating member radially facing the lens assembly at least partially exposes the thermal insulation member.

[0012] Optionally, the heat insulating member includes a fixing groove, the fixing groove includes an opening, the opening is opened on the side of the fixing groove radially facing the lens assembly and on the side of the fixing groove axially facing the transparent cover, and the heating member is clamped in the fixing groove; the fixing groove also includes an outer ring located on the side of the opening radially away from the lens assembly, the outer ring covers the side of the heating member radially away from the lens assembly, and the shading member is arranged on the surface of the outer ring axially facing the transparent cover and does not extend into the opening.

[0013] Optionally, the fixing groove includes an inner ring located between the outer ring and the lens assembly, and a connecting portion connecting the outer ring and the inner ring, the heat insulation component includes a wire threading groove, the wire threading groove is partially opened in the connecting portion and partially opened in the outer ring, the camera also includes a circuit board and a wire, the circuit board is located at the rear end of the lens assembly, the wire connects the circuit board and the heating component, the wire passes through the wire threading groove, enters the fixing groove, and is connected to the heating component.

[0014] Optionally, the fixing groove includes an inner ring located between the outer ring and the lens assembly, and the thickness of the outer ring in the radial direction is greater than the thickness of the inner ring in the radial direction; and / or

[0015] An isolation protrusion is provided on one end of the outer ring axially facing the transparent cover, the isolation protrusion radially protruding toward the lens assembly, one side of the isolation protrusion abuts against the heating element, and the light shielding element extends to the other side opposite to the isolation protrusion; and / or

[0016] The outer ring of the heat insulation element is axially closer to the transparent cover relative to the heating element, and the inner ring of the heat insulation element is axially farther away from the transparent cover relative to the heating element.

[0017] Optionally, the radial dimension of the heating element is determined according to the inner diameter of the shading element and the outer diameter of the lens assembly, and the axial dimension of the heating element is determined according to the distance between the shading element and the heat insulating element.

[0018] Optionally, the heating element is made of a composite material, and the electrical conductivity of the heating element is determined based on the target temperature change value of the camera, the contact area between the heating element and the thermal insulation element, the size of the heating element and the power supply voltage of the heating element.

[0019] Optionally, the heating element comprises a graphene composite material.

[0020] Optionally, there is a gap between the spherical core cover and the lens assembly in the radial direction; or

[0021] There is a gap between the heat insulating member and the core cover in the axial direction; or

[0022] The spherical core cover includes a heat insulation groove, which is opened on the side of the spherical core cover facing the lens assembly in the radial direction and the side of the spherical core cover facing the transparent cover in the axial direction, so that an end of the spherical core cover facing the transparent cover has a gap with the lens assembly in the radial direction and a gap with the heat insulation component in the axial direction.

[0023] Optionally, the heating element is an electric heating element, which includes a positive terminal and a negative terminal. The electric heating element includes a first heating segment and a second heating segment that are relatively arranged around the lens assembly, and the first heating segment and the second heating segment are connected in parallel between the positive terminal and the negative terminal.

[0024] The camera of the present application has a heating element arranged at the front end of the lens, which is close to the transparent cover. This can heat the transparent cover more efficiently and achieve an anti-fogging function by continuous heating. In addition, a heat insulating element is arranged between the shading element and the heating element to avoid direct contact between the shading element and the heating element, which may cause the shading element to shrink and deform due to heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a perspective exploded view of a camera according to an embodiment of the present application;

[0026] Figure 2 for Figure 1 a cross-sectional view of the camera of the illustrated embodiment;

[0027] Figure 3 for Figure 2 A partial enlarged view of area A of the camera of the illustrated embodiment;

[0028] Figure 4 for Figure 2 a top view of the heating element of the illustrated embodiment;

[0029] Figure 5 This is a schematic diagram of a spherical core cover according to another embodiment of the present application. DETAILED DESCRIPTION

[0030] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of devices consistent with certain aspects of the present application, as detailed in the appended claims.

[0031] The terms used in the embodiments of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. Unless otherwise defined, technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by a person of ordinary skill in the art to which this application belongs. The terms "first," "second," and similar terms used in this specification and claims do not denote any order, quantity, or importance, but are simply used to distinguish different components. Similarly, terms such as "a" or "an" do not denote a limitation on quantity, but rather indicate the presence of at least one. "Multiple" or "several" means two or more. Unless otherwise indicated, terms such as "front," "rear," "lower," and / or "upper" are for convenience only and are not intended to limit to a single position or spatial orientation. Terms such as "include" or "comprising" mean that the elements or objects listed before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a," "an," "said," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0032] Figure 1 This is a perspective exploded view of a camera 1 according to an embodiment of the present application. Figure 2 for Figure 1 A cross-sectional view of the camera 1 of the embodiment shown. Figure 1 and 2 , the camera 1 is a hemispherical camera. The camera 1 includes: a main housing 2, a lens assembly 3, a spherical core cover 4, a transparent cover 5, a heating element 6, a light shielding element 7 and a heat insulating element 8. The outermost transparent cover 5 is hemispherical. The lens assembly 3 of the camera 1 is used to shoot objects and is roughly cylindrical. The spherical core cover 4 is covered on the lens assembly 3 and is used to fix the lens assembly 3 to the main housing 2. At the same time, the transparent cover 5 is covered outside the spherical core cover 4. The transparent cover 5 and the spherical core cover 4 are connected by snaps or bolts. There is a receiving space 51 between the transparent cover 5 and the spherical core cover 4. The front end of the lens assembly 3 extends out of the spherical core cover 4 and extends into the receiving space 51. In the illustrated embodiment, the transparent cover 5 is also connected to the main housing 2. In this way, the camera 1 of the present application has a firm structure, ensuring that the lens assembly 3 can rotate with the movement of the spherical core cover 4 to shoot pictures at different angles.

[0033] Please refer to Figure 2, the light shielding member, the heat insulating member 8 and the heating member 6 are sequentially arranged inward from the transparent cover 5, wherein the light shielding member 7 is arranged on the inner surface of the transparent cover 5, and is located at the viewing angle ( Figure 3 The heat shield 7 is located outside the lens assembly 3 (see the triangular portion shown). A heat shield 8 is located within the receiving space 51, surrounding the front end of the lens assembly 3 and fixedly positioned between the light shield 7 and the spherical cover 4. The heater 6 is fixed to the heat shield 8, isolating the heater 6 from the light shield 7. The heater 6 is located within the receiving space 51 and surrounding the front end of the lens assembly 3. This effectively heats the lens assembly 3. Furthermore, due to the presence of the heat shield 8, the heater 6 and light shield 7 do not contact each other, and the heat emitted by the heater 6 does not affect the light shielding effect of the light shield 7. In some embodiments, the light shield 7 is made of EVA material, which deforms when heated. However, to ensure that the heater 6 effectively heats the lens assembly 3 and that the light shield 7 effectively shields the lens assembly 3, the inner diameters of the heater 6 and light shield 7 surrounding the lens assembly 3 must match the outer diameter of the lens assembly 3. This results in a relatively close radial distance between the heater 6 and light shield 7. The heat shield 8 prevents the heater 6 from heating the light shield 7, which could cause deformation or shorten its lifespan. The camera 1 of the present application can achieve a good defogging effect, thereby improving the shooting effect of the camera 1 in severe cold weather.

[0034] The size of the light shield 7 and its distance from the front end of the lens assembly 3 directly affect the shooting effect. In some embodiments, the light shield 7 has a width ranging from 2 mm to 5 mm and a thickness ranging from 1 mm to 3 mm. The light shield 7 can be attached to the heat insulating member 8 using a single-sided adhesive.

[0035] Please refer to Figure 2 In some embodiments, the heat insulating member 8 is made of a soft material (e.g., silicone) and is clamped between the transparent cover 5 and the spherical core cover 4. The heat insulating member 8, clamped by the spherical core cover 4 and the transparent cover 5, can be fixed relative to the lens assembly 3, thereby providing sealing, anti-drop, and shock absorption. In some embodiments, the heat insulating member 8 is bonded to the spherical core cover 4 with glue, and the light shielding member 7 is connected to the heat insulating member 8, which abuts against the transparent cover 5. The spherical core cover 4, the transparent cover 5, the light shielding member 7, and the heat insulating member 8 enclose a receiving space 51. The light shielding member 7 and the heat insulating member 8 relatively isolate the receiving space 51 from other spaces, thereby improving the utilization efficiency of the heating power, reducing the heating power consumption required for demisting, and achieving a certain sealing effect.

[0036] In the illustrated embodiment, the heating element 6 is fixed around the periphery of the lens assembly 3 by the heat insulating element 8. Figure 2The heat insulator 8 covers the side of the heater 6 axially facing the core cover 4. This reduces heat loss toward the core cover 4. The heat insulator 8 covers the side of the heater 6 radially facing away from the lens assembly 3, thereby reducing heat loss toward the periphery of the lens assembly 3. The heater 6 radially faces the lens assembly 3, at least partially exposed from the heat insulator 8. This allows heat to be primarily conducted to the space in front of the lens assembly 3, thereby effectively heating and defogging the transparent cover 5 located in front of the lens assembly 3. This improves heating efficiency and ensures optimal photography. In the illustrated embodiment, the heater 6 is partially exposed radially toward the lens assembly 3 and partially covered by the heat insulator 8, allowing the heater 6 to be retained within the heat insulator 8. In other embodiments, the heater 6 is fully exposed radially toward the lens assembly 3, thereby enhancing heat exchange with the receiving space 51 and achieving better defogging. The heater 6 can be adhered to the heat insulator 8 or secured thereto by other means. In some embodiments, the side of the heating element 6 facing the transparent cover 5 in the axial direction at least partially exposes the heat insulating element 8, so that the transparent cover 5 can be better heated and demisted.

[0037] Figure 3 for Figure 2 A partial enlarged view of area A of the camera 1 of the embodiment shown. Figure 2-Figure 3 In the illustrated embodiment, the heat insulator 8 includes a fixing groove 81, which includes an opening 82. Opening 82 is located on the side of the fixing groove 81 radially facing the lens assembly 3 and on the side of the fixing groove 81 axially facing the transparent cover 5. The heater 6 is secured within the fixing groove 81, thereby ensuring that the heater 6 is securely fixed to the outside of the lens assembly 3 by the heat insulator 8. In the illustrated embodiment, the fixing groove 81 also includes an outer ring 84 located radially away from the lens assembly 3 on the side of the opening 82. The outer ring 84 covers the side of the heater 6 radially facing away from the lens assembly 3. The light shielding member 7 is located on the surface of the outer ring 84 axially facing the transparent cover 5 and does not extend into the opening 82. Because the outer ring 84 covers the side of the heater 6 radially away from the lens assembly 3 and the light shielding member 7 is located on the surface of the outer ring 84 axially facing the transparent cover 5 and does not extend into the opening 82, the heat insulator 8 effectively isolates the heater 6 from the light shielding member 7. This ensures that the camera 1 of the present invention has a good defogging effect and minimizes the impact of the heater 6 on other components. In some embodiments, to ensure stable fixation of the heater 6, the height h of the exposed portion of the heater 6 does not exceed 1 / 2 of its total height H, where the height is the axial dimension. The radial width a of the thermal insulation member 8 covering the side of the heater 6 facing the transparent cover 5 is not less than 0.5 mm, and the thickness of the thermal insulation member 8 at its thinnest point is not less than 0.5 mm.

[0038] Please refer to Figure 3In some embodiments, to reduce the area of ​​the transparent cover 5 requiring heating and improve heat utilization, the heating element 6 should be placed as close as possible to the raised dome of the transparent cover 5. A safe distance D, D ≥ 1.5 mm, should be maintained between the front end of the lens assembly 3 and the transparent cover 5. Furthermore, to avoid obstructing the viewing angle, the light shielding element 7 should be installed outside the viewing angle of the transparent cover 5.

[0039] Figure 4 for Figure 2 For a top view of the heating element of the embodiment shown, please refer to Figure 4 In some embodiments, the heating element 6 of the present application is a resistive heating element, or a heating element made of other conductive materials, which generates heat when powered, thereby achieving stable heating. On the other hand, since the lens assembly 3 itself needs power supply, the camera 1 also includes a circuit board 52 and a wire 61, which connects the circuit board and the heating element 6. Please refer to Figure 3 In the illustrated embodiment, the fixing groove 81 includes an inner ring 83 located between the outer ring 84 and the lens assembly 3, and a connecting portion 85 connecting the outer ring 84 and inner ring 83. The thermal insulator 8 in the illustrated embodiment includes a wire threading slot 89, partially defined in the connecting portion 85 and partially defined in the outer ring 84. The wire threading slot 89 is designed to correspond to the location where the wires exit from the heater 6. In the illustrated embodiment, the circuit board is located at the rear end of the lens assembly 3. A wire 61 connects the circuit board 52 and the heater 6. The wire 61 passes through the wire threading slot 89 and into the fixing groove 81. The power supply wires of the heater 6 are connected to the circuit board through an opening 82 in the spherical cover 4, providing power and heating control for the heater 6. In some embodiments, the wire 61 is connected to both ends of the heater 6 on either diameter, with one end connected to the positive voltage terminal of the circuit board and the other end to the negative voltage terminal of the circuit board. When the circuit board is operating, current flows through the heater 6, causing it to release heat and achieve the defogging function of the camera 1 of the present application. In some embodiments, the heating element 6 adopts a low-power, continuous heating operation mode to reduce the power consumption required for defogger heating and lower the absolute temperature of the high-temperature position.

[0040] Please refer to Figure 4 In some embodiments, the heating element 6 of the present application is an annular heating element 6. The connecting wire can be directly wound around the annular heating element 6. The connection with the wire 61 is provided with a positive wiring hole a and a negative wiring hole b for facilitating the fixing of the wire 61. This facilitates the power supply and heating operation of the heating element 6. The positive wiring hole a and the negative wiring hole b in the figure indicate the wiring positions, and the shape is determined by the wiring method. In other embodiments, it is also possible to heat-smoke a portion of the metal in the heating element 6 material during interference fitting or injection molding to be used for welding the wire 61.

[0041] In the illustrated embodiment, the outer ring 84 of the thermal insulation member 8 is axially closer to the transparent cover 5 relative to the heater 6, while the inner ring 83 of the thermal insulation member 8 is axially farther from the transparent cover 5 relative to the heater 6. In some embodiments, the fixing groove 81 includes an inner ring 83 located between the outer ring 84 and the lens assembly 3. The radial thickness of the outer ring 84 is greater than the radial thickness of the inner ring 83. This reduces heat loss outward through the thermal insulation member 8 and improves the efficiency of heating power consumption.

[0042] Please refer to Figure 3 In some embodiments, the outer ring 84 is provided with an isolation protrusion 841 on one end axially facing the transparent cover 5. The isolation protrusion 841 extends radially toward the lens assembly 3. One side of the isolation protrusion 841 abuts the heater 6, and the light shielding member 7 extends to the other side of the isolation protrusion 841. In this way, the heat shielding member 8 can fully isolate the light shielding member 7 from the heater 6, preventing the heat emitted by the heater 6 from reducing the service life and light shielding effect of the light shielding member 7.

[0043] In some embodiments, a radial gap exists between the spherical cover 4 and the lens assembly 3. The spherical cover 4 is partially radially located between the front end of the lens assembly 3 and the heater 6, while the thermal insulator 8 is partially located between the spherical cover 4 and the heater 6. The inner ring 83 of the thermal insulator 8 is located between the spherical cover 4 and the heater 6, leaving the spherical cover 4 and the front end of the lens assembly 3 free of contact. This reduces or prevents direct heat transfer from the heater 6 to the front end of the lens assembly 3, which could result in a significant temperature difference between the front and rear ends of the lens assembly 3 and cause defocus. The heat path runs from the heater 6 to the thermal insulator 8, then to the spherical cover 4, and then through the gap to the lens assembly 3. The radial gap between the spherical cover 4 and the lens assembly 3 increases the thermal resistance of this heat path. In some embodiments, a radial gap exists between the thermal insulator 8 and the spherical cover 4. In other embodiments, the thermal insulator 8 and the spherical cover 4 fit radially.

[0044] Figure 5 This is a schematic diagram of a core cover 4 according to another embodiment of the present application. In some embodiments, a gap is created between the heat insulator 8 and the core cover 4 in the axial direction. The surface of the heat insulator 8 facing the core cover 4 in the axial direction partially abuts against the core cover 4, while partially separates from the core cover 4. This allows the core cover 4 to support the heat insulator 8, while minimizing the contact area. This slows heat conduction, preventing heat from dissipating within the containment space, maintaining a relatively stable temperature within the containment space, and achieving a better defogging effect.

[0045] Please continue to refer to Figure 5 In the illustrated embodiment, the spherical core cover 4 includes a heat insulation groove 41, which is opened on the side of the spherical core cover 4 facing the lens assembly 3 in the radial direction and on the side of the spherical core cover 4 facing the transparent cover 5 in the axial direction, so that one end of the spherical core cover 4 facing the transparent cover 5 has a radial gap with the lens assembly 3 and an axial gap with the heat insulation member 8.

[0046] To ensure the heating effect of the heater 6 and to ensure that the temperature of the spherical crown area of ​​the transparent cover 5 is substantially equal to the temperature inside the camera 1, the amount of heat that the heater 6 can dissipate per unit time must be calculated. To determine the amount of heat required for defogging in this application, a portion of the heat from the heater 6 is conducted to the spherical crown through the air, and a portion is dissipated from the surrounding structural components. The power consumption required to heat the spherical crown area of ​​the transparent cover 5 is equal to the amount of heat conducted by the heater 6 through the air. The specific calculation method is as follows:

[0047] First, calculate the power consumption required for the defogger function of camera 1. The air within containment space 51 generates heat due to the operation of lens assembly 3, resulting in a temperature rise ΔT compared to the ambient temperature Ta. Assuming an ambient temperature of 100% relative humidity, the temperature of transparent cover 5 must be no less than Ta + ΔT. The area of ​​transparent cover 5 that requires effective heating is the spherical cap enclosed by light shield 7. If the radius of transparent cover 5 is R and the inner radius of light shield 7 is r, the area of ​​the spherical cap is:

[0048] The power consumption required to heat the transparent cover 5 is equal to the heat Q dissipated to the external environment when the transparent cover 5 is heated to the temperature Ta+△T 球冠 =hS 球冠 △T, where h is the comprehensive heat exchange coefficient between the transparent cover 5 and the outside air (taking into account natural convection, thermal radiation, etc.). h can be calculated according to 10W / (m2·K) to obtain the required heating power consumption. The formula is as follows:

[0049] The power consumption required for heating the transparent cover 5 is:

[0050]

[0051] The radius of the transparent cover 5 is R, the inner radius of the light shielding member 7 is r, h is the comprehensive heat exchange coefficient between the transparent cover 5 and the outside air, and ΔT is the temperature rise compared to the outside environment temperature Ta during the operation of the camera.

[0052] Next, calculate the heat conducted by the heating element 6 through the air. Calculate based on the contact area between the heating element 6 and the air. Please refer to Figure 3 For a heating element with a height of H and a width of A, the outer radius of the heating element = the inner radius of the heating element r + a, where a is the radial width of the heat insulating element 8 covering the side of the heating element 6 facing the transparent cover 5. The contact area of ​​the heating element 6 with the air is calculated as follows:

[0053]

[0054] After stable operation, the surface temperature of the heating element 6 is T H The temperature difference from the heating element 6 to the air in the receiving space 51 and the transparent cover 5 is TH -(Ta+△T), the amount of heat dissipated to the air in the receiving space 51 by natural convection at this time is: Q 腔内 =hS 外露加热环 ΔT 腔内 =h*π*(A-a+Hh)*(2r+3a-A)*[T H -(T a +ΔT)]②

[0055] Finally, calculate the heat dissipated to the thermal insulation 8 by heat conduction:

[0056]

[0057] Wherein, k is the thermal conductivity of the thermal insulation member 8, A 导热 is the area of ​​the heat conduction path from the heater 6 to the core cover 4 through the heat insulating member 8 , and δ is the thickness of the heat insulating member 8 in the heat conduction direction.

[0058] After the size of the heating element 6 is determined, the heating efficiency of the heating element 6 is related to the voltage and resistance of the heating element 6 .

[0059] In the illustrated embodiment, the voltage applied to heater 6 is the same as the controller voltage of lens assembly 3 to save costs, as the original circuit board of camera 1 is utilized. In other embodiments, components may be provided to adjust the voltage applied to heater 6 to adjust the heating efficiency of heater 6. The resistance of heater 6 is related to its size, wiring location, and resistivity.

[0060] Regarding the dimensions of the heater 6, in the illustrated embodiment, the radial dimension of the heater 6 is smaller than the inner diameter of the light shielding member 7 and larger than the outer diameter of the lens assembly 3. The axial dimension of the heater 6 is smaller than the distance between the light shielding member 7 and the heat shield 8, resulting in a compact structure. Due to the limited space at the front end of the lens assembly 3 in hemispherical products, the housing space 51 must be minimized to ensure a compact camera 1 structure, making it difficult to accommodate a large heater 6. The wiring locations are symmetrically arranged as shown. To ensure that the heater 6 of this application can be used in a variety of cameras 1 without modifying the original lens assembly 3 and transparent cover 5, the thickness and inner and outer diameters of the heater 6 must be determined with reference to the original lens assembly 3.

[0061] Regarding the wiring position of the heating element 6, in the illustrated embodiment, the heating element 6 is an electric heating element 6, which includes a positive wiring hole a and a negative wiring hole b. The arrow in the illustration indicates the direction of current flow. The electric heating element 6 includes a first heating segment 62 and a second heating segment 63 disposed relative to each other around the lens assembly 3. The first heating segment 62 and the second heating segment 63 are connected in parallel between the positive wiring hole a and the negative wiring hole b. The resistance of the entire heating element 6 is determined by the length and area of ​​the first heating segment 62 and the second heating segment 63. When the size of the heating element 6 is determined, a lower resistance can be achieved by connecting the heating elements in parallel at the same thickness. The positive wiring hole a and the negative wiring hole b of the heating element 6 are located at opposite ends of the diameter of the heating element 6. This allows for lower resistance when the heating element 6 is smaller in size.

[0062] In terms of the resistivity of the heater 6, in the illustrated embodiment, since the voltage, wiring position and size of the heater 6 are determined first, in order to ensure that the heating effect of the heater 6 is sufficient to offset the temperature difference between the inside and outside of the camera 1, the resistance of the heater 6 needs to be calculated. In some embodiments, the heater 6 includes a resistor, and a resistor with a suitable resistance value can be directly calculated and selected. In the illustrated embodiment, the heater 6 is made of a composite material, which is a mixture of a conductive material (such as graphene) and other materials (such as plastic), and has resistance itself. In this case, the heater 6 includes a graphene composite material. The heater 6 of the annular graphene composite material itself generates heat at low pressure, which can heat the transparent cover 5 more efficiently and achieve an anti-fogging function through continuous heating with low power consumption. On the other hand, the electrical conductivity of the graphene composite material varies with the material mixing ratio. The electrical conductivity of the heater 6 can be determined based on the target temperature change value of the camera 1, the contact area between the heater 6 and the thermal insulation member 8, the size of the heater 6 and the power supply voltage of the heater 6. The specific calculation method is as follows:

[0063] The resistivity of the heating ring is set to ρ. Since the size of the first heating section 62 is equal to the second heating section 63, the resistance of the two sections is:

[0064]

[0065] Wherein, R1 is the resistance of the first heating section 62, R2 is the resistance of the second heating section 63, r is the inner radius of the heating element, A is the width of the heating element, H is the height of the heating element, a is the radial width of the heat insulation covering the side of the heating element facing the transparent cover, and the total resistance after parallel connection is R 总 for:

[0066]

[0067] The supply voltage is known to be U, and the heat generated by the heating ring is:

[0068]

[0069] Since part of the heat of the heating element 6 is conducted to the anti-fog part of the spherical cap through the air, part of the heat is lost to the surrounding structural parts (Q 发热 =Q 导热 +Q 腔内 ④).

[0070] The power consumption required to heat the anti-fog part of the spherical cap is equal to the heat conducted by the heating element 6 through the air (Q 腔内 =Q 球冠 ⑤), for a specific model of hemisphere, the conductivity of the heating element 6 can be determined according to formulas ①②③④⑤.

[0071] The present application arranges a heating element 6 at the front end of the lens, close to the transparent cover 5, so that the transparent cover 5 can be heated more efficiently, and the anti-fogging function can be achieved through low-power continuous heating. On the other hand, to prevent the light shielding element 7 from direct contact with the heating element 6, which may cause the light shielding element 7 to shrink and deform due to heat, a heat insulating element 8 is arranged between the light shielding element 7 and the heating element 6. The camera 1 of the present application has a good shooting effect.

[0072] The above describes in detail the camera provided in the embodiments of the present application. This document uses specific examples to illustrate the camera in the embodiments of the present application. The description of the above embodiments is intended only to help understand the core concept of the present application and is not intended to limit the present application. It should be noted that those skilled in the art may make various improvements and modifications to the present application without departing from the spirit and principles of the present application, and such improvements and modifications should fall within the scope of protection of the claims appended to the present application.

Claims

1. A camera, characterized in that: It includes: lens assembly; A spherical core cover, which is arranged on the lens assembly; a transparent cover, which is arranged outside the spherical core cover and has a receiving space between the cover and the spherical core cover, and the front end of the lens assembly extends out of the spherical core cover and into the receiving space; a heating element, located in the receiving space and surrounding the front end of the lens assembly; a light shielding member, provided on the inner surface of the transparent cover and located outside the field of view of the lens assembly; and a heat insulating member located in the receiving space, surrounding the front end of the lens assembly, and fixedly disposed between the light shielding member and the spherical core cover; the heating member is fixed to the heat insulating member, and the heat insulating member isolates the heating member from the light shielding member; The heat insulating member covers the side of the heating member axially facing the spherical core cover and the side of the heating member radially away from the lens assembly. The side of the heating member radially facing the lens assembly is at least partially exposed to the heat insulating member.

2. The camera according to claim 1, wherein The heat insulating member includes a fixing groove, which includes an opening, wherein the opening is provided on a side of the fixing groove radially facing the lens assembly and on a side of the fixing groove axially facing the transparent cover, and the heating member is clamped in the fixing groove; the fixing groove also includes an outer ring located on a side of the opening radially away from the lens assembly, the outer ring covers a side of the heating member radially away from the lens assembly, and the light-shielding member is provided on a surface of the outer ring axially facing the transparent cover and does not extend into the opening.

3. The camera according to claim 2, wherein The fixing groove includes an inner ring located between the outer ring and the lens assembly, and a connecting portion connecting the outer ring and the inner ring. The heat insulation component includes a wire threading groove, which is partially opened in the connecting portion and partially opened in the outer ring. The camera also includes a circuit board and a wire. The circuit board is located at the rear end of the lens assembly. The wire connects the circuit board and the heating component. The wire passes through the wire threading groove, enters the fixing groove, and is connected to the heating component.

4. The camera according to claim 2, wherein: The fixing groove includes an inner ring located between the outer ring and the lens assembly, and the thickness of the outer ring in the radial direction is greater than the thickness of the inner ring in the radial direction; and / or An isolation protrusion is provided on one end of the outer ring axially facing the transparent cover, the isolation protrusion radially protruding toward the lens assembly, one side of the isolation protrusion abuts against the heating element, and the light shielding element extends to the other side opposite to the isolation protrusion; and / or The outer ring of the heat insulation element is axially closer to the transparent cover relative to the heating element, and the inner ring of the heat insulation element is axially farther away from the transparent cover relative to the heating element.

5. The camera according to claim 1, wherein The radial dimension of the heating element is determined according to the inner diameter of the light shielding element and the outer diameter of the lens assembly, and the axial dimension of the heating element is determined according to the distance between the light shielding element and the heat insulating element.

6. The camera according to claim 1, wherein The heating element is made of a composite material, and the electrical conductivity of the heating element is determined according to the target temperature change value of the camera, the contact area between the heating element and the thermal insulation element, the size of the heating element and the power supply voltage of the heating element.

7. The camera according to any one of claims 1 to 6, characterized in that: The heating element includes a graphene composite material.

8. The camera according to claim 1, wherein There is a gap between the spherical core cover and the lens assembly in the radial direction; or There is a gap between the heat insulating member and the core cover in the axial direction; or The spherical core cover includes a heat insulation groove, which is opened on the side of the spherical core cover facing the lens assembly in the radial direction and the side of the spherical core cover facing the transparent cover in the axial direction, so that an end of the spherical core cover facing the transparent cover has a gap with the lens assembly in the radial direction and a gap with the heat insulation component in the axial direction.

9. The camera according to claim 1, wherein The heating element is an electric heating element, which includes a positive terminal and a negative terminal. The electric heating element includes a first heating segment and a second heating segment that are arranged opposite to each other around the lens assembly, and the first heating segment and the second heating segment are connected in parallel between the positive terminal and the negative terminal.

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