Lens assembly, lens, camera module and electronic equipment

Abstract

The utility model discloses a lens assembly, a lens, a camera module and electronic equipment. The lens assembly comprises a lens, a heating piece and a temperature adjusting piece, and the heating piece is used for heating the lens; the initial resistance value of the temperature adjusting piece is larger than or equal to 0.01 times of the resistance value of the heating piece and smaller than or equal to 0.1 times of the resistance value of the heating piece, and the resistance value of the temperature adjusting piece is in positive correlation with the temperature. The heating piece and the temperature adjusting piece are connected in series.

Description

Technical Field

[0001] Embodiments of the present application relate to the technical field of optical elements, and in particular, to lens assemblies, lenses, camera modules, and electronic devices. Background Art

[0002] An optical lens is an essential component in a machine vision system and is widely used in many fields. For example, a reverse camera, 360° panoramic view, or autonomous driving assistance in the automotive field all use optical lenses, and positioning assembly and automatic inspection in the industrial field also use optical lenses. However, the lenses of optical lenses are easily affected by the external environmental temperature. In a low-temperature environment, the lenses are prone to fogging or even frosting, which in turn affects the imaging effect of the lens.

[0003] In order to be able to defog and defrost in a timely manner, heating elements are installed on the lenses of some lenses. In actual application, it is found that the heating temperature of the heating element is easily too high, even exceeding 70°C, which will not only scald users, damage the waterproof structure inside the lens and affect the imaging effect, but also may burn out the heating element itself. In order to avoid the above situation, the power of the heating element can be reduced, but this will also reduce the heating efficiency, making it difficult to balance the relationship between the defogging and defrosting efficiency and the heating power of the heating element, and affecting the use experience of the lens. Summary of the Utility Model

[0004] The lens assembly, lens, camera module, and electronic device provided by the embodiments of the present application can solve or partially solve the above-mentioned deficiencies in the prior art or other deficiencies in the prior art.

[0005] According to the lens assembly provided in the first aspect of the present application, it includes a lens, a heating element, and a temperature regulating element. The heating element is used to heat the lens; the temperature regulating element is connected in series with the heating element, the resistance value of the temperature regulating element is positively correlated with the temperature, and the initial resistance value of the temperature regulating element is greater than or equal to 0.01 times and less than or equal to 0.1 times the resistance value of the heating element.

[0006] In an exemplary embodiment, the initial resistance value of the temperature regulating element is less than or equal to 0.05 times the resistance value of the heating element.

[0007] In an exemplary embodiment, the initial resistance value of the temperature regulating element is less than or equal to 0.03 times the resistance value of the heating element. In an exemplary embodiment, the temperature regulating element and the heating element are connected in series through an electrical conduction element.

[0008] In an exemplary embodiment, the distance between the temperature regulating element and the heating element is positively correlated with the designed temperature difference, and the designed temperature difference is the difference between the Curie temperature of the temperature regulating element and the critical temperature of the lens.

[0009] In an exemplary embodiment, the distance between the temperature regulating element and the heating element is negatively correlated with the volume of the temperature regulating element.

[0010] In an exemplary embodiment, the distance d1 between the temperature regulating member and the heating member and the volume V1 of the temperature regulating member satisfy: 0 ≤ d1 * V1 ≤ 70 mm * mm 3 .

[0011] In an exemplary embodiment, the distance d1 between the temperature regulating member and the heating member and the volume V1 of the temperature regulating member satisfy: 0 ≤ d1 * V1 ≤ 35 mm * mm 3 .

[0012] In an exemplary embodiment, the distance between the temperature regulating member and the heating member is greater than or equal to 0 and less than or equal to 20 mm. In an exemplary embodiment, the distance between the temperature regulating member and the heating member is greater than or equal to 0 and less than or equal to 10 mm.

[0013] In an exemplary embodiment, the volume of the lens is positively correlated with the designed temperature difference, and the designed temperature difference is the difference between the Curie temperature of the temperature regulating member and the critical temperature of the lens.

[0014] In an exemplary embodiment, the designed temperature difference is less than or equal to 20 °C.

[0015] In an exemplary embodiment, the Curie temperature of the temperature regulating member is greater than or equal to 70 °C and less than or equal to 90 °C.

[0016] In an exemplary embodiment, the volume of the temperature regulating member is greater than or equal to 0.25 mm 3 and less than or equal to 3.5 mm 3 .

[0017] In an exemplary embodiment, the width of the temperature regulating member in the direction perpendicular to the optical axis of the lens is greater than or equal to 0.5 mm and less than or equal to 1.5 mm.

[0018] In an exemplary embodiment, a ring-shaped heating member is provided on the surface of the lens perpendicular to the optical axis direction.

[0019] In an exemplary embodiment, the heating member includes a first heating section and a second heating section, and the first heating section, the temperature regulating member, and the second heating section are connected in series in sequence.

[0020] In an exemplary embodiment, the temperature regulating member includes at least one of a positive temperature coefficient ceramic thermistor and a positive temperature coefficient resin thermistor.

[0021] In an exemplary embodiment, in at least one of the high temperature and high humidity test and the high and low temperature test, the test change rate of the resistance value of the temperature regulating member is less than or equal to 5%;

[0022] and / or, in at least one of the high temperature and high humidity test and the high and low temperature test, the test change rate of the resistance value of the heating member is less than or equal to 5%.

[0023] The lens provided according to the second aspect of the present application includes: a lens barrel and the lens assembly of any one of the above, and at least part of the lens of the lens assembly is located inside the lens barrel.

[0024] In an exemplary embodiment, the temperature adjusting member is located inside the lens barrel, and there is a gap between the temperature adjusting member and the lens barrel in a direction perpendicular to the axial direction of the lens barrel.

[0025] In an exemplary embodiment, the lens barrel includes a first mounting cavity and a second mounting cavity that are arranged axially along the lens barrel and communicate with each other. There is a stepped surface between the first mounting cavity and the second mounting cavity. At least part of the lens is located inside the second mounting cavity, and the temperature adjusting member is located inside the first mounting cavity.

[0026] In an exemplary embodiment, the stepped surface is recessed axially along the lens barrel to form an avoidance groove, and there is a gap between the surface of the avoidance groove and the temperature adjusting member.

[0027] In an exemplary embodiment, the surface of the lens perpendicular to the optical axis direction is hermetically connected to the stepped surface through a first seal.

[0028] In an exemplary embodiment, the lens barrel includes a third mounting cavity. At least part of the lens is located inside the third mounting cavity. The outer peripheral surface of the lens is hermetically connected to the second side wall surface of the third mounting cavity through a second seal. The temperature adjusting member is located inside the third mounting cavity and there is a gap between the temperature adjusting member and the second side wall surface.

[0029] In an exemplary embodiment, the gap between the temperature adjusting member and the lens barrel is greater than or equal to 0.3 mm.

[0030] In an exemplary embodiment, the lens further includes a housing bracket connected to the lens barrel. The housing bracket is provided with a conductive structure, and the surface of the conductive structure is connected to the temperature adjusting member.

[0031] In an exemplary embodiment, a heating member and a temperature adjusting member are connected to the outside of the lens barrel.

[0032] The imaging module provided according to the third aspect of the present application includes: a circuit board, a photosensitive chip, and the lens of any one of the above. The lens is arranged on the light sensing path of the photosensitive chip, and the photosensitive chip is electrically connected to the circuit board.

[0033] The electronic device provided according to the fourth aspect of the present application includes: the imaging module as above.

[0034] The lens assembly provided by the embodiment of the present application includes a lens, a heating element, and a temperature regulating element. The heating element is used to heat the lens. The heating element is arranged close to the lens, but the position of the heating element is not limited. The heating element is connected in series with the temperature regulating element. When the lens needs to be heated for defrosting or demisting, the heating element and the temperature regulating element are powered on. The temperature of the heating element rises, and the heat is conducted to the lens to melt the frost on the outer surface of the lens or remove the water mist on the inner and outer surfaces of the lens. At the same time, the temperature of the temperature regulating element also rises synchronously. When the actual temperature of the temperature regulating element reaches the resistance mutation point, the resistance of the temperature regulating element mutates and rises, the power of the temperature regulating element increases, and the power of the heating element decreases, finally reaching a stable value and ensuring that the temperature of the lens does not exceed the regulatory temperature, avoiding the situation that the temperature of the heating element is too high and burns the lens or scalds the user.

[0035] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become easily understood through the following description. Brief Description of the Drawings

[0036] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, objects, and advantages of the present application will become more apparent. The drawings are used to better understand the solution and do not constitute a limitation to the present application. In the drawings:

[0037] Figure 1 is a schematic structural diagram of the series connection of the heating element and the temperature regulating element of the lens assembly according to the embodiment of the present application;

[0038] Figure 2 is a schematic bottom view structure diagram of the heating element and the temperature regulating element according to the embodiment of the present application;

[0039] Figure 3 is a schematic side view structure diagram of the lens assembly according to the embodiment of the present application;

[0040] Figure 4 is a schematic diagram of the positional relationship between the heating element and the temperature regulating element according to the embodiment of the present application;

[0041] Figure 5 is a schematic structural diagram of a lens according to the embodiment of the present application;

[0042] Figure 6 is a schematic structural diagram of a lens barrel according to the embodiment of the present application;

[0043] Figure 7 is Figure 5 a partial enlarged structural diagram of part A in

[0044] Figure 8Another schematic diagram of the lens according to an embodiment of the present application;

[0045] Figure 9 It is the third schematic diagram of the lens according to an embodiment of the present application;

[0046] Figure 10 It is the fourth schematic diagram of the lens according to an embodiment of the present application; and

[0047] Figure 11 It is the fifth schematic diagram of the lens according to an embodiment of the present application.

[0048] Reference numerals:

[0049] 100, lens; 101, first lens; 102, second lens; 103, third lens;

[0050] 200, heating element;

[0051] 300, temperature regulating element;

[0052] 400, electrical conduction element;

[0053] 500, lens barrel; 501, first installation cavity; 502, first side wall surface; 503, step surface; 504, avoidance groove; 505, second side wall surface; 506, second installation cavity; 507, third installation cavity;

[0054] 610, first seal; 620, second seal; 630, housing bracket; 631, conductive structure;

[0055] 700, power supply; 800, switch. Detailed implementation manners

[0056] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0057] It should be noted that in this specification, the expressions such as first and second are only used to separate one feature from another feature region and do not represent any limitation on the features, especially do not represent any order of precedence.

[0058] In the description of the present application, unless otherwise specified, the orientation or positional relationship indicated by terms such as "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present application.

[0059] Unless otherwise clearly specified and defined, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to specific circumstances.

[0060] In the drawings, for the convenience of illustration, the thickness, dimensions and shapes of the components have been slightly adjusted. The drawings are only examples and are not drawn to strict scale.

[0061] It should also be understood that expressions such as "comprising", "including", "having", "containing" and / or "including" are open rather than closed expressions in this specification. They indicate the presence of the stated features, elements and / or components, but do not exclude the presence of one or more other features, elements, components and / or their combinations. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of features, rather than just individual elements in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0062] Unless otherwise defined, all the terms used herein have the same meaning as the ordinary understanding of those of ordinary skill in the art to which the present application belongs. It should also be understood that unless there is a clear statement in the present application, words defined in a common dictionary should be interpreted as having a meaning consistent with their meaning in the context of the related art, and should not be interpreted in an idealized or overly formal sense.

[0063] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. In addition, unless clearly defined or contradictory to the context, the specific steps included in the methods described in the present application do not have to be limited to the recorded order, but can be executed in any order or executed in parallel. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0064] Figures 1 to 3 The structural schematic diagram of the lens assembly in one of the embodiments of the present application is shown. As Figures 1 to 3As shown in the figure, the lens assembly includes a lens 100, a heating element 200, and a temperature regulating element 300. The heating element 200 is used to heat the lens 100. The heating element 200 and the temperature regulating element 300 are connected in series, and the resistance value of the temperature regulating element 300 is positively correlated with its own temperature.

[0065] The heating element 200 is connected in series with the temperature regulating element 300, and the power of the temperature regulating element 300 is proportional to its resistance value. During the heating process, the power supply 700 supplies power to the heating element 200 and the temperature regulating element 300. As the heating time of the heating element 200 increases, the heating element 200 and the temperature regulating element 300 heat up. The resistance value of the temperature regulating element 300 changes with the temperature. When the resistance value of the temperature regulating element 300 increases, the actual power of the temperature regulating element 300 increases. Thus, without changing the total power, the power of the heating element 200 can be reduced, enabling the heating element 200 to not only achieve high-power heating but also achieve temperature control to ensure safety. Connecting the heating element 200 in series with the temperature regulating element 300 can automatically regulate the heating power of the heating element 200, with a simple circuit structure and sensitive regulation.

[0066] The heating element 200 is used to heat the lens 100. It can be understood that the heating element 200 is arranged close to the lens 100. The heating element 200 can be attached to the surface of the lens 100, or there can be a gap between the heating element 200 and the lens 100. The positional relationship between the heating element 200 and the lens 100 is not limited, as long as it is ensured that the heating element 200 can heat the lens 100 to remove fog and frost.

[0067] The lens assembly of the embodiment of the present application can avoid the situation where the heating temperature of the heating element 200 is too high, burning out the lens 100 or scalding the user, solves the problem of safety risks existing in high-power heating elements, and also solves the problem of difficulty in quickly removing fog and frost by reducing the power of the heating element; it has the characteristics of low cost, high heating efficiency, and safe temperature control.

[0068] For the lens assembly of the embodiment of the present application, by connecting the heating element 200 and the temperature regulating element 300 in series, the heating element 200 is preferably made of a material with little resistance value fluctuation. For example, materials such as copper, constantan, and ceramics can solve the problems of poor reliability and large resistance value fluctuation compared with resin-based PTC heating films as heating elements. Among them, the structure of the heating element 200 is not limited. For example, the heating element 200 can be a heating wire or a heating film.

[0069] The temperature regulating element 300 can be a positive temperature coefficient thermistor (positive temperature coefficient, abbreviated as PTC). Among them, the temperature regulating element 300 includes at least one of a ceramic thermistor and a resin thermistor. The ceramic-based PTC material has good stability and can meet the requirements of vehicle reliability. For example, the temperature regulating element 300 is selected as a surface-mounted ceramic PTC resistor, which meets the requirements of installation space size and has long-term stable reliability.

[0070] In the circuit where the heating element 200 is connected in series with the temperature regulating element 300, a switch 800 can be set. The electrical conduction element 400 is connected to the heating element 200, the power supply 700, and the switch 800 to control the on-off. The temperature regulating element 300 can be connected in series with the heating element 200 through the electrical conduction element 400; alternatively, the temperature regulating element 300 is connected in series between two sections of the circuit of the heating element 200, and the heating element 200 is connected to the electrical conduction element 400. The electrical conduction element 400 can be, but is not limited to, a wire.

[0071] In some other embodiments, the initial resistance value of the temperature regulating element 300 is less than that of the heating element 200. With the low initial resistance value of the temperature regulating element 300, the voltage-dividing power of the temperature regulating element 300 is small and does not affect the heating power of the heating element 200. Among them, the resistance value of the heating element 200 can be understood as the initial resistance value of the heating element 200.

[0072] The initial resistance value of the temperature regulating element 300 is greater than or equal to 0.01 times and less than or equal to 0.1 times the resistance value of the heating element 200, the heating power of the heating element 200 is reasonable, and the surface temperature of the lens 100 is appropriate.

[0073] If the initial resistance value of the temperature regulating element 300 is too large, the heating power of the heating element 200 will decrease and the defrosting time will be prolonged; if the initial resistance value of the temperature regulating element 300 is too small, the temperature of the heating element 200 will increase, and there is a risk that the surface temperature of the lens 100 exceeds 70 °C.

[0074] Among them, the initial resistance value of the temperature regulating element 300 is greater than or equal to 0.01 times and less than or equal to 0.05 times the resistance value of the heating element 200, which has little influence on the heating power of the heating element 200 and ensures that the surface temperature of the lens 100 does not exceed 70 °C. For example, the initial resistance value of the temperature regulating element 300 is greater than or equal to 0.01 times and less than or equal to 0.03 times the resistance value of the heating element 200.

[0075] In some other embodiments, the temperature regulating element 300 is connected in series with the heating element 200 through the electrical conduction element 400. The difference between the Curie temperature of the temperature regulating element 300 and the critical temperature of the lens 100 is the designed temperature difference, and the distance from the temperature regulating element 300 to the heating element 200 is positively correlated with the designed temperature difference. As the designed temperature difference increases, the distance from the temperature regulating element 300 to the heating element 200 increases, and as the designed temperature difference decreases, the distance from the temperature regulating element 300 to the heating element 200 decreases. The critical temperature of the lens 100 is a determined value, and the Curie temperature of the temperature regulating element 300 can be set according to the relationship between the designed temperature difference and the distance.

[0076] The Curie temperature of the temperature adjustment member 300, denoted as T0, can be understood as the mutation point of the resistance value of the temperature adjustment member 300 changing with temperature. After exceeding the Curie temperature, the resistance value of the temperature adjustment member 300 rises sharply. The critical temperature of the lens 100, denoted as T1, can be understood as the critical temperature value affecting the optical performance of the lens 100. The critical temperature of the lens 100 is generally less than or equal to 70 °C. The Curie temperature of the temperature adjustment member 300 is greater than the critical temperature of the lens 100, and the designed temperature difference is a positive number, denoted as T0 - T1.

[0077] Reference Figure 2 and Figure 3 As shown, there is a distance between the temperature adjustment member 300 and the heating member 200. Reference Figure 2 As shown, the temperature adjustment member 300 is arranged on one side in the radial direction of the heating member 200; reference Figure 3 As shown, the temperature adjustment member 300 is arranged on one side in the axial direction of the heating member 200.

[0078] In some embodiments, the distance from the temperature adjustment member 300 to the heating member 200 (denoted as d1, Figure 2 and Figure 3 both marked d1) is negatively correlated with the volume of the temperature adjustment member 300 (denoted as V1). The larger the volume of the temperature adjustment member 300, the smaller the distance from the temperature adjustment member 300 to the heating member 200; conversely, the smaller the volume of the temperature adjustment member 300, the larger the distance from the temperature adjustment member 300 to the heating member 200. The distance from the temperature adjustment member 300 to the heating member 200 is related to the heat dissipation ability of the temperature adjustment member 300. The larger the volume of the temperature adjustment member 300, the better the heat dissipation ability, the lower the temperature of the temperature adjustment member 300, and close-range heat transfer compensation is required. Therefore, reducing the distance from the temperature adjustment member 300 to the heating member 200 makes the surface temperature control of the lens 100 more precise, and vice versa. Among them, the distance d1 from the temperature adjustment member 300 to the heating member 200 can be understood as the minimum distance from the temperature adjustment member 300 to the heating member 200, and can be, but is not limited to Figure 2 and Figure 3 the distances marked. In some other embodiments, the temperature adjustment member 300 is connected in series with the heating member 200 through an electrical conduction member 400. The distance between the temperature adjustment member 300 and the heating member 200 is positively correlated with the designed temperature difference, and, the distance between the temperature adjustment member 300 and the heating member 200 is negatively correlated with the volume of the temperature adjustment member 300.

[0079] The distance from the temperature adjustment member 300 to the heating member 200 is denoted as d1, and the calculation formula is:

[0080] d1 = (T0 - T1) / αV1;

[0081] Among them, T0-T1 is the designed temperature difference, V1 is the volume of the temperature adjusting member 300, α is a fixed coefficient, and α can be obtained through experimental verification.

[0082] In an exemplary embodiment, the distance d1 between the temperature adjusting member 300 and the heating member 200 and the volume V1 of the temperature adjusting member 300 satisfy: 0 ≤ d1 * V1 ≤ 70 mm * mm 3 . By regulating the relative relationship between the distance d1 between the temperature adjusting member 300 and the heating member 200 and the volume V1 of the temperature adjusting member 300, the heat dissipation of the temperature adjusting member 300 is controlled within a reasonable range to ensure accurate temperature control.

[0083] In an exemplary embodiment, the distance d1 between the temperature adjusting member 300 and the heating member 200 and the volume V1 of the temperature adjusting member 300 satisfy: 0 ≤ d1 * V1 ≤ 35 mm * mm 3 . While ensuring temperature control, the distance d1 between the temperature adjusting member 300 and the heating member 200 or the volume V1 of the temperature adjusting member 300 can be reduced, which is beneficial to reducing the occupied space of the temperature adjusting member 300 in the lens assembly and conducive to reducing the overall volume of the lens.

[0084] In an exemplary embodiment, the distance d1 between the temperature adjusting member 300 and the heating member 200 is greater than or equal to 0 and less than or equal to 20 mm. Controlling the distance d1 between the temperature adjusting member 300 and the heating member 200 within a reasonable range helps to control the heat dissipation of the temperature adjusting member 300 within a reasonable range to ensure accurate temperature control.

[0085] Among them, the distance between the temperature adjusting member 300 and the heating member 200 can be greater than or equal to 0 and less than or equal to 10 mm. The arrangement position of the temperature adjusting member 300 can be designed according to the lens structure space and is applicable to lenses 100 of various structures.

[0086] The distance d1 from the temperature adjusting member 300 to the heating member 200 can be understood as the minimum distance from the temperature adjusting member 300 to the heating member 200, and this minimum distance can include the distance along the optical axis direction (refer to Figure 3 shown), and can also include the distance perpendicular to the optical axis direction (refer to Figure 2 shown).

[0087] Among them, the volume of the temperature adjusting member 300 is greater than or equal to 0.25 mm 3 and less than or equal to 3.5 mm 3 , which can prevent the temperature adjusting member 300 from overheating and can also ensure temperature control. The volume of the temperature adjusting member 300 affects heat dissipation. If the volume of the temperature adjusting member 300 is too small, the heat dissipation speed is slow, which will cause the temperature adjusting member 300 to overheat severely; if the volume of the temperature adjusting member 300 is too large, the heat dissipation is too fast, and the temperature of the temperature adjusting member 300 is relatively low, which affects the temperature control effect.

[0088] Among them, the width of the temperature adjusting member 300 is greater than or equal to 0.5 mm and less than or equal to 1.5 mm. The width is the length in the direction perpendicular to the optical axis of the lens 100, which reduces the influence of the temperature adjusting member 300 on the radial dimension of the lens barrel 500 so as to be adapted to a variety of lens barrels 500.

[0089] Reference Figure 3 、 Figure 7 and Figure 8 As shown in

[0090] and

[0091] When the temperature adjusting member 300 is arranged in the lens barrel 500 of the lens, the width w of the temperature adjusting member 300 is greater than or equal to 0.5 mm and less than or equal to 1.5 mm, which has little influence on the grooving diameter of the lens barrel 500, facilitates the installation of the temperature adjusting member 300 in the lens barrel 500, and is convenient for embedding the lens assembly.

[0092] T0 = T1 + βV2;

[0093] Among them, T1 is the critical temperature of the lens 100, V2 is the volume of the lens 100, and β is a coefficient, and β can be obtained through experimental verification.

[0094] Among them, the design temperature difference is less than or equal to 20 °C, and the critical temperature of the lens 100 is a determined value. The Curie temperature of the temperature adjusting member 300 can be determined according to the design temperature difference, and the calculation method of the Curie temperature of the temperature adjusting member 300 is simple.

[0095] Among them, the Curie temperature of the temperature adjusting member 300 is greater than or equal to 70 °C and less than or equal to 90 °C, which ensures that the surface temperature of the lens 100 does not exceed the critical temperature (such as 70 °C) and ensures the defrosting efficiency.

[0096] In some other embodiments, the heating element 200 includes a first heating section and a second heating section. The first heating section, the temperature adjusting element 300, and the second heating section are connected in series in sequence. That is, the temperature adjusting element 300 is connected between two adjacent circuits of the heating element 200. The temperature adjusting element 300 may not be spaced from the heating element 200, and the position of the temperature adjusting element 300 is more flexible.

[0097] Refer to Figure 4 As shown, an annular heating element 200 is provided on the surface of the lens 100 perpendicular to the optical axis direction. The annular heating element 200 is provided with an annular heating wire or heating film. The temperature adjusting element 300 can be connected in series between two heating wires or between two heating films. Among them, the surface perpendicular to the optical axis direction of the lens 100 includes the top surface and the bottom surface of the lens 100. The top surface of the lens 100 is the surface facing the outside of the lens barrel 500, and the bottom surface of the lens 100 is the surface facing the inside of the lens barrel 500. Figure 4 Schematically shows that the heating element 200 is provided on the bottom surface of the lens 100.

[0098] The temperature adjusting element 300 is provided at one or more positions of the annular heating element 200, and the position of the temperature adjusting element 300 is flexible. The heating element 200 can be connected to one or more temperature adjusting elements 300. For example, Figure 4 in, the temperature adjusting element 300 can be provided at at least one of the positions shown in the figure.

[0099] Of course, when multiple temperature adjusting elements 300 are provided, the positions of the temperature adjusting elements 300 are not limited. For example, one temperature adjusting element 300 can be connected in series with the heating element 200 through an electrical conduction element 400 and spaced from the heating element 200 (such as Figure 2 or Figure 3 shown), and one temperature adjusting element 300 can be connected in series between the first heating section and the second heating section of the heating element 200 (such as Figure 4 shown).

[0100] In some embodiments, in at least one of the high-temperature and high-humidity tests and the high-low temperature tests, the test change rate of the resistance value of the temperature adjusting element 300 is less than or equal to 5%. The resistance value stability of the temperature adjusting element 300 is good. When the temperature adjusting element 300 selects a ceramic positive temperature coefficient thermistor, the resistance value stability of the temperature adjusting element 300 can be optimized. The resistance value change of the temperature adjusting element 300 is small, and excellent de-icing efficiency and precise temperature control level are still maintained after reliability testing.

[0101] In some embodiments, in at least one of the high-temperature and high-humidity tests and the high-low temperature tests, the test change rate of the resistance value of the heating element 200 is less than or equal to 5%. The resistance value change of the heating element 200 is small, and excellent de-icing efficiency is still maintained after reliability testing. The heating element 200 can select a heating material with good stability, such as copper, constantan, ceramics, etc.

[0102] The high temperature and high humidity test conditions in the above embodiments: Test in an environment with a temperature of 85°C and a humidity of 85%. The test time of the high temperature and high humidity test can be controlled at about 1000h.

[0103] The high and low temperature test conditions in the above embodiments: Test in an environment with a temperature change range of -40°C to 105°C. The test time of the high and low temperature test can be controlled at about 1000h.

[0104] In the above embodiments, the lens assembly may include one or more lenses 100. The number of lenses 100 is not limited. The heating element 200 is used to heat at least one lens 100. Refer to Figure 5 As shown, the lens includes three or more lenses. The heating element 200 is mainly used to heat the first lens 101. The first lens 101 is located at the top of the lens to defog and defrost the first lens 101. The first lens 101, the second lens 102, the third lens 103, etc. are arranged along the optical axis direction from the top to the bottom of the lens. Among them, the third lens 103 represents one lens or multiple lenses, and the shape of one or multiple lenses in the third lens 103 is not limited.

[0105] For the lens assembly in the above embodiments, the lens assembly can be applied to a lens.

[0106] Another embodiment of the present application also provides a lens. Refer to Figures 5 to 11 As shown, the lens includes a lens barrel 500 and the lens assembly of any one of the above. At least a part of the lens 100 is arranged in the lens barrel 500. Since the lens assembly has the above beneficial effects, the lens having the above lens assembly also has the above beneficial effects. For details, refer to the above content and will not be elaborated here.

[0107] Refer to Figure 5 and Figure 6 As shown, the temperature adjusting element 300 is located in the lens barrel 500. The lens barrel 500 can protect the temperature adjusting element 300, facilitate the installation of the temperature adjusting element 300, and also facilitate the adjustment of the positional relationship between the temperature adjusting element 300 and the heating element 200.

[0108] When there is a distance between the temperature adjusting element 300 and the heating element 200 along the axial direction of the heating element 200, the temperature adjusting element 300 can be arranged in the lens barrel 500; when there is a distance between the temperature adjusting element 300 and the heating element 200 in the circumferential direction of the heating element 200, the temperature adjusting element 300 can also be arranged in the lens barrel 500.

[0109] Refer to Figure 5 and Figure 6As shown, the lens barrel 500 includes a first mounting cavity 501 and a second mounting cavity 506 that are arranged axially along the lens barrel 500 and communicate with each other. At least a part of the lens 100 is located in the second mounting cavity 506, and the temperature regulating member 300 is located in the first mounting cavity 501. The second mounting cavity 506 is at the top of the first mounting cavity 501, and the temperature regulating member 300 can be installed in the first mounting cavity 501 through the second mounting cavity 506.

[0110] There is a stepped surface 503 between the first mounting cavity 501 and the second mounting cavity 506. At least a part of the lens 100 is limited and positioned by the stepped surface 503. The stepped surface 503 is recessed axially along the lens barrel 500 to form an avoidance groove 504. There is a gap between the surface of the avoidance groove 504 and the temperature regulating member 300. The temperature regulating member 300 is installed in the first mounting cavity 501 through the avoidance groove 504. The avoidance groove 504 provides a space for the temperature regulating member 300 to ensure that the temperature regulating member 300 can be smoothly installed into the first mounting cavity 501. Among them, at least one avoidance groove 504 is provided circumferentially on the stepped surface 503, and the number of avoidance grooves 504 can be set as required. Refer to Figure 6 As shown, the first mounting cavity 501 and the second mounting cavity 506 are divided by the stepped surface 503. The space at the top of the stepped surface 503 can be understood as the first mounting cavity 501, and the space at the bottom of the stepped surface 503 can be understood as the second mounting cavity 506. The lens barrel 500 includes a first side wall surface 502 connected to the stepped surface 503. The first side wall surface 502 encloses the first mounting cavity 501. It can also be understood that the avoidance groove 504 is formed by a depression at the connection between the first side wall surface 502 and the stepped surface 503. Refer to Figure 7 As shown, a gap d2 is provided between the temperature regulating member 300 and the surface of the avoidance groove 504 to prevent the temperature regulating member 300 from contacting and dissipating heat with the surface of the avoidance groove 504.

[0111] The surface of the lens 100 perpendicular to the optical axis direction is hermetically connected to the stepped surface 503 through a first seal 610. It can be understood that the stepped surface 503 is provided at the bottom of the lens 100, and the bottom surface of the lens 100 is hermetically connected through the first seal 610. Among them, the first seal 610 can be a sealing ring.

[0112] Refer to Figure 5As shown, a first lens 101, a second lens 102, and a third lens 103 are disposed within the lens barrel 500. The third lens 103 represents a combination of one lens or multiple lenses. The first lens 101, the second lens 102, and the third lens 103 are arranged in sequence from the top to the bottom along the optical axis direction, and the top surface of the first lens 101 faces the outside of the lens barrel. The first lens 101 is heated by a heating member 200, and the heat provided by the heating member 200 is used to remove fog and frost on the top surface of the first lens 101. The first lens 101 is limited by a stepped surface 503 and is hermetically connected to the stepped surface 503 through a first seal 610. The second lens 102 and the third lens 103 are separated by a spacer 104. The heat of the heating member 200 can also be used to adjust the temperatures of the second lens 102 and the third lens 103. Reference Figure 8 As shown, the lens barrel 500 includes a third installation cavity 507. At least a part of the lens 100 is located within the third installation cavity 507. The outer peripheral surface of the lens 100 is hermetically connected to the second side wall surface 505 of the third installation cavity 507 through a second seal 620. A temperature adjustment member 300 is located within the third installation cavity 507, and a gap d3 is provided between the temperature adjustment member 300 and the second side wall surface 505.

[0113] The lens 100 is circumferentially limited by the second side wall surface 505 of the lens barrel 500. The second side wall surface 505 extends along the optical axis direction of the lens 100, and a gap is provided between the temperature adjustment member 300 and the second side wall surface 505. The outer peripheral surface of the lens 100 is hermetically connected to the lens barrel 500. The opening area of the lens barrel 500 is sufficient for the temperature adjustment member 300 to pass through, and there is no need to provide an avoidance groove, which can simplify the structure of the lens barrel 500.

[0114] The above-mentioned first side wall surface 502 extends along the optical axis direction of the lens 100 and the second side wall surface 505 extends along the optical axis direction of the lens 100, mainly to reflect the extension directions of the first side wall surface 502 and the second side wall surface 505, and does not strictly limit the first side wall surface 502 and the second side wall surface 505 to be parallel to the optical axis.

[0115] Figure 5 and Figure 8 Two different lens sealing methods are provided. Correspondingly, the installation method of the temperature adjustment member 300 is adjusted adaptively, so that the temperature adjustment member 300 is adapted to various lens structures.

[0116] Reference Figure 9 As shown, the lens further includes a housing bracket 630 connected to the lens barrel 500. The housing bracket 630 is provided with a conductive structure 631. The surface of the conductive structure 631 is connected to the temperature adjustment member 300. The temperature adjustment member 300 does not occupy the internal space of the lens barrel 500, which can avoid heat transfer between the temperature adjustment member 300 and the lens barrel 500, and has little impact on the structure of the lens barrel 500. The heating member 200 is electrically connected to the conductive structure 631 through an electrical conduction member 400.

[0117] In some cases, the housing bracket 630 connects the circuit board and the photosensitive chip. The housing bracket 630 is provided with solder joints, and the temperature regulating member 300 can be connected to the solder joints. The housings can be inserted into the lens barrel 500, and the connection is simple and convenient.

[0118] Reference Figure 10 and Figure 11 As shown, the heating member 200 and the temperature regulating member 300 are connected to the outside of the lens barrel 500, and the positions of the heating member 200 and the temperature regulating member 300 are more flexible. Reference Figure 10 As shown, the heating member 200 and the temperature regulating member 300 are connected to the top end of the lens barrel 500; Reference Figure 11 As shown, the heating member 200 and the temperature regulating member 300 are connected to the bottom end of the lens barrel 500.

[0119] At this time, the heating member 200 can be optionally arranged on the bottom surface of the lens 100, and the position of the heating member 200 is not limited to being arranged on the outer wall of the lens barrel 500.

[0120] In some embodiments, reference Figure 7 and Figure 8 As shown, the gap (d2 or d3) between the temperature regulating member 300 and the adjacent housing (such as the lens barrel 500) is greater than or equal to 0.3 mm, preventing the heat of the temperature regulating member 300 from being transferred to the adjacent housing, avoiding the failure to reach the Curie temperature starting point due to the decrease of the temperature of the temperature regulating member 300 itself, ensuring that the temperature of the temperature regulating member 300 reaches the starting point, and accurately controlling the temperature.

[0121] When the temperature regulating member 300 is arranged inside the lens barrel 500, there is a gap between the temperature regulating member 300 and the surface of the lens barrel 500, and the gap is greater than or equal to 0.3 mm; when the temperature regulating member 300 is arranged outside the lens barrel 500, there is a distance between the temperature regulating member 300 and the lens barrel 500, avoiding heat transfer by contact between the temperature regulating member 300 and the lens barrel 500, and the distance is greater than or equal to 0.3 mm.

[0122] When the temperature regulating member 300 is connected between the two sections of the circuit of the heating member 200, the temperature regulating member 300 needs to avoid the lens barrel 500 to prevent the temperature regulating member 300 from directly contacting the lens barrel 500. Hereinafter, the following embodiments are provided in conjunction with the drawings:

[0123] Embodiment 1

[0124] Reference Figures 1 to 3 as well as Figure 5As shown, the heating element 200 and the temperature regulating element 300 are connected in series through the electrical conduction element 400. Both the heating element 200 and the temperature regulating element 300 are arranged inside the lens barrel 500. There is a distance between the bottom surface of the temperature regulating element 300 and the bottom surface of the heating element 200. The bottom surface of the first lens 101 is hermetically connected to the lens barrel 500 through the first seal 610. A gap is provided between the surface of the temperature regulating element 300 and the lens barrel 500. The temperature regulating element 300 can be set as follows: the initial resistance is 1Ω, the Curie temperature is 90°C, the width is 1.25mm, and the volume is 3.125mm 3 , the temperature regulating element 300 is arranged at a position 1mm away from the heating element 200, and the gap between the temperature regulating element 300 and the lens barrel 500 is 0.3mm; the resistance of the heating element 200 can be set to 50Ω.

[0125] When defrosting by heating is required, the electrical conduction element 400 is connected to the power supply 700 to energize and heat the heating element 200 and the temperature regulating element 300. The temperature of the heating element 200 rises, and the heat is conducted to the lens 100 to melt the frost on the outer surface of the lens 100 or remove the water mist on the inner and outer surfaces of the lens 100; at the same time, the temperature of the temperature regulating element 300 also rises synchronously. When the actual temperature of the temperature regulating element 300 reaches its Curie temperature point, the resistance value of the temperature regulating element 300 suddenly rises, the power of the temperature regulating element 300 increases, and the power of the heating element 200 decreases, and finally reaches a stable value to ensure that the temperature of the lens 100 does not exceed 70°C.

[0126] Embodiment Two

[0127] Reference Figure 8 As shown, the difference from Embodiment One is that the sealing method between the first lens 101 and the lens barrel 500 is different. Figure 8 In this case, the outer peripheral surface of the first lens 101 is hermetically connected to the lens barrel 500 through the second seal 620. It can be compatible with some lenses with limited space beside the first lens 101. The position of the second seal 620 is set on the side of the first lens 101 to avoid poor airtightness.

[0128] At this time, the temperature regulating element 300 can be set as follows: the initial resistance is 1Ω, the Curie temperature is 90°C, the width is 0.8mm, and the volume is 1.8mm 3 , the temperature regulating element 300 is arranged at a position 1mm away from the heating element 200, and the gap between the temperature regulating element 300 and the lens barrel 500 is 0.3mm; the resistance of the heating element 200 can be set to 50Ω.

[0129] Embodiment Three

[0130] Reference Figure 9As shown, the difference from the first embodiment is that the temperature adjustment member 300 is arranged outside the lens barrel 500. The temperature adjustment member 300 does not occupy the space inside the lens barrel 500. The temperature adjustment member 300 can be connected to the conductive structure 631 (such as a wire plug-in structure) at the rear end of the lens barrel 500, which can play a role in temperature control, facilitating the assembly of the heating member 200 and the lens barrel 500 not needing to adjust the structure for the temperature adjustment member 300, helping to reduce costs.

[0131] The temperature adjustment member 300 can be set as: initial resistance 1Ω, Curie temperature 70°C, volume 2.5mm 3 , with the width not limited. The temperature adjustment member 300 is arranged on the conductive structure 631 at the rear end of the lens barrel 500; the resistance of the heating member 200 can be set to 50Ω.

[0132] Embodiment Four

[0133] Reference Figure 4 As shown, the difference from the first embodiment is that the temperature adjustment member 300 is connected in series between the first heating section and the second heating section of the heating member 200 and can be connected in series at any position of the heating member 200 circuit. Connecting the temperature adjustment member 300 into the circuit can play a role in temperature control. Among them, the temperature adjustment member 300 needs to avoid heat transfer in contact with the lens barrel 500.

[0134] The temperature adjustment member 300 can be set as: initial resistance 1Ω, Curie temperature 70°C, volume 2.5mm 3 , the width of the temperature adjustment member 300 is not limited, and the edge of the temperature adjustment member 300 should not exceed the edge of the heating member 200 as much as possible; the resistance of the heating member 200 can be set to 50Ω.

[0135] Embodiment Five

[0136] Reference Figure 10 and Figure 11 As shown, the difference from the first embodiment is that the temperature adjustment member 300 and the heating member 200 are arranged outside the lens barrel 500 (such as the top or bottom of the lens barrel 500), which can be used for top heating and bottom heating of the lens 100.

[0137] The temperature adjustment member 300 can be set as: initial resistance 1Ω, Curie temperature 70°C, width 1mm, volume 2mm 3 ; the resistance of the heating member 200 can be set to 50Ω.

[0138] It should be noted that the width of the temperature adjustment member 300 can be not limited. Limiting the width of the temperature adjustment member 300 can limit the overall size of the lens.

[0139] The third aspect embodiment of the present application further provides an imaging module, including a circuit board and a lens as described in any one of the above, and the lens is disposed on the circuit board. Since the lens has the above beneficial effects, the imaging module having the above lens also has the above beneficial effects. For details, please refer to the above content and will not be elaborated here.

[0140] The fourth aspect embodiment of the present application further provides an electronic device, including the imaging module in the above embodiment. Since the imaging module has the above beneficial effects, the electronic device having the above imaging module also has the above beneficial effects. For details, please refer to the above content and will not be elaborated here. The electronic device can also be an independent imaging device such as a vehicle-mounted camera, or an imaging module integrated in an auxiliary driving system, or a mobile terminal such as a mobile phone.

[0141] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lens assembly, characterized in that, Comprising: A lens; A heating element for heating the lens; And A temperature regulating element connected in series with the heating element, the resistance value of the temperature regulating element being positively correlated with the temperature, and the initial resistance value of the temperature regulating element being greater than or equal to 0.01 times and less than or equal to 0.1 times the resistance value of the heating element; Wherein, the distance d1 between the temperature adjusting member and the heating member and the volume V1 of the temperature adjusting member satisfy: 0 ≤ d1 * V1 ≤ 70 mm * mm 3 .

2. The lens assembly according to claim 1, wherein The initial resistance value of the temperature regulating element is less than or equal to 0.05 times the resistance value of the heating element.

3. The lens assembly according to claim 1, wherein The distance between the temperature regulating element and the heating element is positively correlated with the designed temperature difference, wherein the designed temperature difference is the difference between the Curie temperature of the temperature regulating element and the critical temperature of the lens; And / or, the distance between the temperature regulating element and the heating element is negatively correlated with the volume of the temperature regulating element.

4. The lens assembly according to claim 1, wherein The distance d1 between the temperature regulating member and the heating member and the volume V1 of the temperature regulating member satisfy: 0 ≤ d1 * V1 ≤ 35 mm * mm 3 .

5. The lens assembly according to claim 1, wherein, The distance between the temperature regulating element and the heating element is greater than or equal to 0 and less than or equal to 20 mm.

6. The lens assembly according to claim 1, wherein The distance between the temperature regulating element and the heating element is greater than or equal to 0 and less than or equal to 10 mm.

7. The lens assembly according to claim 1, wherein, The volume of the lens is positively correlated with the designed temperature difference, the designed temperature difference being the difference between the Curie temperature of the temperature regulating element and the critical temperature of the lens, and the Curie temperature of the temperature regulating element being greater than or equal to 70 °C and less than or equal to 90 °C.

8. The lens assembly according to claim 3 or 7, characterized in that, The designed temperature difference is less than or equal to 20 °C.

9. The lens assembly according to any one of claims 1 to 7, characterized in that, The volume of the temperature regulating member is greater than or equal to 0.25 mm 3 and less than or equal to 3.5 mm 3 .

10. The lens assembly according to any one of claims 1 to 7, characterized in that, The width of the temperature regulating element in the direction perpendicular to the optical axis of the lens is greater than or equal to 0.5 mm and less than or equal to 1.5 mm.

11. The lens assembly according to any one of claims 1 to 7, characterized in that, An annular heating element is arranged on the surface of the lens perpendicular to the optical axis, the heating element includes a first heating section and a second heating section, and the first heating section, the temperature regulating element and the second heating section are connected in series in sequence.

12. The lens assembly according to any one of claims 1 to 7, characterized in that, The temperature regulating element includes a positive temperature coefficient ceramic thermistor and / or a positive temperature coefficient resin thermistor.

13. The lens assembly according to any one of claims 1 to 7, characterized in that, In at least one of the high temperature and high humidity test and the high and low temperature test, the test change rate of the resistance value of the temperature regulating element is less than or equal to 5%; And / or, in at least one of the high temperature and high humidity test and the high and low temperature test, the test change rate of the resistance value of the heating element is less than or equal to 5%.

14. A lens, characterized in that, Comprising: A lens barrel; And, The lens assembly according to any one of claims 1 to 13, at least a part of the lens of the lens assembly being located inside the lens barrel.

15. The lens according to claim 14, wherein, The temperature regulating element is located inside the lens barrel, and there is a gap between the temperature regulating element and the lens barrel in the direction perpendicular to the axial direction of the lens barrel; Or, the heating element and the temperature regulating element are connected to the outside of the lens barrel.

16. The lens according to claim 15, characterized in that, The lens barrel includes a first installation cavity and a second installation cavity arranged along the axial direction of the lens barrel and communicating with each other. At least a part of the lens is located in the second installation cavity, the temperature regulating element is located in the first installation cavity, there is a step surface between the first installation cavity and the second installation cavity, the step surface is recessed along the axial direction of the lens barrel to form an avoidance groove, and there is a gap between the surface of the avoidance groove and the temperature regulating element; And / or, the lens barrel includes a third installation cavity, at least a part of the lens is located in the third installation cavity, the outer peripheral surface of the lens is hermetically connected to the second side wall surface of the third installation cavity through a second sealing member, and the temperature regulating element is located in the third installation cavity and there is a gap between the temperature regulating element and the second side wall surface.

17. The lens according to claim 16, wherein, The surface of the lens perpendicular to the optical axis direction is hermetically connected to the stepped surface through a first seal.

18. The lens according to claim 14, wherein The gap between the temperature adjustment member and the lens barrel is greater than or equal to 0.3 mm.

19. The lens according to claim 14, characterized in that, The lens further includes a housing bracket connected to the lens barrel, the housing bracket is provided with a conductive structure, and the surface of the conductive structure is connected to the temperature adjustment member.

20. An imaging module, characterized in that, Comprising: A circuit board and a photosensitive chip, the photosensitive chip is electrically connected to the circuit board; and, The lens according to any one of claims 14 to 19, the lens is disposed on the light sensing path of the photosensitive chip.

21. An electronic device, characterized in that, Comprising: The imaging module according to claim 20.

Images