Optical lens assemblies, camera modules, and camera systems

Abstract

An optical lens assembly (2j) for a camera module, comprising a lens mount (6j), a lens configuration (11j) consisting of one or more lens elements (12) disposed inside the lens mount (6j), and a heating element (18j) for heating at least one of the one or more lens elements (12, 13j), particularly the front element (13j) located on the object side of the lens configuration (11j). The lens mount (6j), particularly its lens holder (7j), comprises a lens mount wall (50k) defining an internal space for housing one or more lens elements (12) of the lens configuration (11), and the heating element (18j) is housed within the lens mount wall (50k) and particularly embedded.

Description

Technical Field

[0001] This application claims priority from German Patent Application DE 10 2023 203 473.5 and German Patent Application DE 10 2023 203 474.3, the content of which is incorporated herein by reference.

[0002] The present invention relates in particular to an optical lens assembly for outdoor use. Such an optical lens assembly can be used, in particular, in camera modules such as vehicle surround cameras and / or web cameras. Furthermore, such an optical lens assembly can be used in telescopes, binoculars and / or glasses. The present invention further relates to camera modules for in-vehicle use, in particular such as vehicle surround cameras and cameras for electronic mirrors, and to respective camera systems.

Background Art

[0003] Optical lens assemblies are exposed to all kinds of environmental conditions, such as moisture, humidity, and / or extreme temperatures, for example as part of an in-vehicle camera. In particular, fog and / or ice impair the optical function of such optical lens assemblies. To mitigate the effects of fog and / or frost, it is known to heat the optical lens assembly. Usually, an external heater, such as a heater blanket, is installed next to the optical lens assembly, in particular so as to at least partially surround the optical lens assembly. Such an external heater is inefficient and requires a long heating time because the entire optical lens assembly has to be heated. The heating device can also be incorporated into the optical lens assembly. For example, a heating element can be arranged on the front or back of the front element of the optical lens assembly. When installed on the front or outer surface of the front element, the heating element is exposed to the environmental conditions. When installed on the back or inner surface of the front element, the heating element impairs the arrangement of additional lenses in the so-called lens stacking. In either case, the heating element penetrates into the optical path of the optical lens assembly and impairs the optical properties.

[0004] Furthermore, incorporating a heating device into an optical lens assembly requires contact with the heating device within the optical lens assembly. Wiring and connecting electrical components within an optical lens assembly is complex. For example, conductors may be routed inside the lens mount, and these conductors must pass through the lens elements located there. This can interfere with the placement of the lens elements. In addition, the wiring components may be subjected to forces necessary to hold the lens elements in place. Particularly in outdoor applications, optical lens assemblies require waterproofing. Routing electrical components around waterproofing treatments can compromise the sealing properties of the optical lens assembly. [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] The technical objective of the present invention is to improve optical lens assemblies, and in particular to provide an optical lens assembly that performs efficient and reliable heating without impairing the optical properties and / or sealing performance of the optical lens configuration. [Means for solving the problem]

[0006] This objective is achieved by the optical lens assembly described in claim 1. The optical lens assembly comprises a lens mount, a lens configuration consisting of one or more lens elements disposed within the lens mount, and a heating element for heating at least one of the one or more lens elements, particularly the front element located on the object side of the lens configuration. The lens mount, particularly its lens holder, comprises a lens mount wall defining an internal space for housing one or more lens elements of the lens configuration, and the heating element is housed within the lens mount wall. The heating element is reliably positioned inside the lens mount wall and is particularly protected from the environment. Advantageously, particularly with respect to the lens configuration, the heating element is housed within the lens mount wall so as not to come into direct contact with one or more lens elements. Advantageously, the heating element is integrated into the optical lens assembly without impairing the positioning and / or insertion of one or more lens elements within the lens mount. Furthermore, flexibility with respect to the available lens elements is improved. In particular, the heating element may be pre-mounted on the lens mount. When inserting one or more lens elements, interaction with the heating element is not required, for example, by connecting the heating element to one or more lens elements, particularly the front element. Furthermore, the heating element does not impair the sealing properties of the optical lens assembly. A further advantage is that the heating element does not impair the optical properties of the lens assembly and, in particular, does not protrude into the optical path. Particularly advantageous is that, since the heating element is not located on or attached to the first (outer) or second (inner) surface of the front element, it is not subject to environmental hazards or forces acting on the lens element. As a result, the heating element has a reliable and stable placement.

[0007] A further advantage is that the heating element does not affect or interfere with the application of coatings to the first and / or second surfaces of the front element. Such coatings can be used to improve scratch resistance, anti-reflective properties, and other characteristics.

[0008] In this specification, an optical lens assembly is understood as an optical device that forms an image of an object on the object side onto the image side opposite to the object side. Such an optical device is also called an objective lens. In particular, when used in telescopes or binoculars, the image is observed directly by the user. In particular, when used in camera modules, the resulting image is perceived by an image sensor.

[0009] An optical lens assembly comprises a lens configuration (also called a lens stack) consisting of one or more lens elements. The lens configuration is mounted on a lens mount, which holds the lens elements of the configuration in their respective positions.

[0010] The lens mount comprises, in particular, a lens holder and a lens cap. For example, the lens cap may be attached to the lens holder, especially to the lens barrel, by screwing it onto the object side of the lens holder. The lens cap can secure the lens element, which is located inside the lens holder, in place.

[0011] The lens mount may further comprise one or more spacer components positioned between the lens cap, lens holder, and / or lens configuration.

[0012] The lens mount may further include one or more heat transfer members for conducting heat from a heating element to at least one of one or more lens elements.

[0013] The lens holder may have a lens barrel in which one or more lens elements of a lens configuration are arranged. The lens holder may further include a base (also called a front camera housing) on ​​the side of the lens barrel opposite to the lens cap. The base is used, in particular, for connecting to further components of the camera module, such as a printed circuit board assembly and / or a back cover. The lens holder and the base may be integrally constructed.

[0014] The lens mount wall may also be the wall of the lens holder, in particular the wall of the lens barrel. In that case, the lens mount wall is called the lens holder wall or lens barrel wall. The lens mount wall may additionally or alternatively include the wall of the lens cap and / or lens retainer. The lens mount wall may, in particular, include any space formed between the components of the lens mount, in particular any space formed between the lens cap and the lens holder.

[0015] In particular, housing a heating element within the lens mount wall is understood to mean that the heating element is surrounded by the lens mount wall, especially one or more different parts of the lens mount. Specifically, the heating element is covered by the parts and / or components of the lens mount, especially the parts and / or components of the lens holder, in the direction toward the outside of the internal space in which one or more lens elements are positioned and of the optical lens assembly.

[0016] Preferably, the heating element is housed in the wall of the lens holder (lens holder wall), particularly in the wall of the lens barrel (lens barrel wall). This allows for particularly reliable positioning of the heating element and eliminates the need for special front elements, such as a front element having a groove for housing the heating element and / or a front element in which the heating element is embedded.

[0017] For example, the heating element can be placed in the cavity of a lens mount, particularly a lens holder. For example, a cavity may be provided in the lens mount, particularly the lens holder. The heating element is placed inside the cavity, and the cavity may be closed. For example, a closing member may be attached to the lens mount, particularly the lens holder. It is also possible to fill the cavity with material after inserting the heating element, particularly by molding. This greatly increases the design freedom of the lens mount, particularly the lens holder. The lens holder may be made of a different material from the closing member and the filler material.

[0018] Lens mounts, and especially lens holders, can be made of metal, particularly aluminum, at least partially. This allows for better dissipation of heat generated, especially from the electrical components of the camera module, such as the printed circuit assembly, and particularly its image sensor.

[0019] Lens mounts, particularly lens holders, can also be manufactured from plastic materials. Plastic materials offer greater design flexibility and enable easy and cost-effective manufacturing. Furthermore, plastic materials can be used to embed heating elements, especially through overmolding.

[0020] The heating element may consist of a resistance heating element, such as a heating wire. The heating element may have a heating wire wound around the side of the front element. Such a heating element is efficient, easy to install, and highly reliable.

[0021] For example, a heating element housed within the lens mount wall can be positioned near one of the lens elements, particularly the front element, to advantageously improve heat transfer to the lens elements. In some embodiments, the heating element may be positioned in close contact with at least a portion of one or more lens elements, particularly at least a portion of the front element, for example, its side surface. For example, the heating element can be positioned inside a groove in the lens mount wall and surrounded on at least three sides by the lens mount wall. In particular, the heating element can be housed, particularly embedded, within the lens mount wall such that the lens mount wall and the heating element form a substantially smooth lens mount wall surface in contact with one or more lens elements.

[0022] According to a preferred embodiment of the present invention, the heating element is housed inside the lens mount wall and does not come into direct contact with one or more lens elements. This significantly reduces the influence of the heating element on the positioning of the lens elements and the sealing of the optical lens assembly. Furthermore, the heating element is reliably shielded from any forces and / or environmental influences that may act on the lens elements. Preferably, the heating element is positioned close to the inner wall of the lens mount to allow for good heat transfer to the lens elements.

[0023] According to a preferred embodiment of the present invention, the lens configuration includes a front element on the object side of the lens configuration. The front element comprises a first surface facing the object, a second surface opposite to the first surface, and a side surface connecting the first and second surfaces. The heating element is arranged circumferentially along the side surface of the front element. This arrangement ensures direct and efficient heating of the front element.

[0024] In the context of the present invention, the front element is understood as the lens element facing the object in a lens configuration. In other words, the front element is the outermost lens on the object side in a lens configuration. The front element is the lens element through which light enters the optical lens assembly from the object side. The front element may have optical functions. Alternatively, the front element may be a cover glass without optical functions, particularly a flat cover glass, or it may be equipped with a cover glass. The front element can be mounted in particular on the inside or outside of a lens mount, and in particular on the inside or outside of a lens cap of a lens mount. Preferably, the front element may be located on the object side of a lens holder, particularly a lens barrel. For example, the front element may be fixed in place via a lens cap.

[0025] The front element has a first surface on the object side. The first surface is a surface facing outward from the optical lens assembly. The first surface is also referred to as the outer surface of the front element. The second surface is on the opposite side of the first surface and faces the inside of the optical lens assembly, particularly another lens element in this arrangement. The second surface is also referred to as the inner surface. The first surface and the second surface are connected via the side surface of the front element. The side surface of the front element is the radially outer surface of the front element. It basically extends along the optical axis of the lens configuration. The optical axis is also referred to as the longitudinal axis of the lens configuration.

[0026] The optical material of the lens element, particularly the front element, may be, for example, glass or a transparent polymer such as acrylic glass.

[0027] According to a preferred embodiment of the technology of the present invention, the heating element is embedded in the lens mount wall, particularly the lens holder wall, preferably the lens barrel wall. Being embedded in the lens mount wall, particularly the lens barrel wall, should be understood as being surrounded entirely by the lens mount wall, particularly the lens barrel wall.

[0028] For example, the heating element may be overmolded by the lens mount wall during the injection molding of the lens mount. Thereby, the heating element is particularly reliably arranged. The heating element is reliably protected from the influence of the environment. Furthermore, the arrangement of the heating element does not impair the sealing property, particularly the waterproof property, of the lens mount.

[0029] It is also possible to use multi-component injection molding, particularly two-component injection molding. Thereby, different materials can be combined in the lens mount. In particular, different plastic materials can be used. For example, the portion covering the heating element can be formed of a plastic having particularly high thermal conductivity.

[0030] In addition to the heating element, the wiring for supplying electrical energy to the heating element can also be routed within the lens mount wall, particularly within the lens holder wall, and can be embedded. In this way, a simple and reliable electrical connection is established. The heating element may also be equipped with a secondary coil of an induction coil device, which can be housed within the lens mount wall, and can be embedded. This allows energy to be supplied to the embedded heating element without the need for mechanical contacts.

[0031] For example, the heating element may include a secondary coil of an induction coil device for supplying electrical energy to the heating element. This simplifies the supply of electrical energy. In particular, the heating element can be easily and reliably positioned circumferentially along the side surface of the front element without requiring electrical contacts. For example, the heating element can be at least partially embedded in the optical material of the lens element and / or within the lens mount wall. Particularly preferably, the heating element can be easily housed within the lens mount wall without requiring physical connections for energy supply, and can be embedded in particular. The heating element can be completely embedded within the lens mount wall and can be hermetically sealed in particular.

[0032] The primary coil of an induction coil device can be incorporated into an optical lens assembly, such as a lens mount. For example, the primary coil of a heating coil device can be housed in, or in particular embedded in, a lens cap and / or lens holder. The primary coil of an induction coil device is not necessarily part of an optical lens assembly. For example, the primary coil may be part of another component of the camera module. Alternatively, the primary coil of an induction coil device may be part of the housing in which the optical lens assembly is placed during use, such as a camera housing.

[0033] According to a preferred embodiment of the present invention, the lens mount comprises a lens holder and a lens cap, the lens cap being attached to the lens holder on the object side of the optical lens assembly. The heating element is positioned between the lens cap and the lens holder, particularly in the annular space formed between the lens cap and the lens holder. Positioning the heating element between the lens cap and the lens holder makes the assembly of the optical lens assembly particularly easy and ensures that the heating element is safely housed within the lens mount wall. For example, it is not necessary to insert the heating element into the wall of the lens holder, particularly the wall of the lens barrel, for example by injection molding. This increases the freedom of choice in the lens holder, particularly in the choice of the material from which the lens holder is made. Furthermore, the heating element can be easily replaced by removing the cap, improving the maintainability of the optical lens assembly. It is also possible to hermetically seal the camera module with an adhesive or the like to prevent moisture ingress.

[0034] According to a preferred embodiment of the present invention, the lens mount comprises a heat transfer member disposed between a heating element and at least one lens element of the lens configuration, particularly the front element. The heat transfer member ensures efficient heat transfer from the heating element to the lens element being heated.

[0035] The heat transfer member may be part of the lens mount wall housing the heating element. The heat transfer member may be made of metal, particularly aluminum and / or brass. The heat transfer member may be a separate part of the lens mount and / or integrated with other parts of the lens mount, particularly the lens holder. The heat transfer member may be, for example, part of the lens holder wall, and in particular may be integrated with other parts of the lens mount wall. For example, the heat transfer member may be a projection of the lens mount wall that protrudes between the heating element and the lens element, particularly the front element, especially in the direction of the optical axis.

[0036] For example, a heat transfer component can be incorporated into the lens holder by multi-component injection molding of the lens holder. For instance, the heat transfer component can be molded from a plastic material having a higher thermal conductivity than the plastic material used to mold the other parts of the lens holder.

[0037] According to a preferred embodiment of the present invention, the heat transfer member is a spacer ring that accommodates at least one lens element, particularly a front element. It is particularly preferable to use a spacer ring (inductive or non-inductive) as the heat transfer member. The spacer ring can combine different functions, namely, precise positioning of the lens element as well as heat conduction. The spacer ring is particularly part of a lens mount for mounting one or more lens elements.

[0038] According to a preferred embodiment of the present invention, the heat transfer member contacts at least one lens element, particularly the front element, at least circumferentially along the side surface of the front element. It has been proven particularly advantageous to supply heat to the lens element via the side surface. Heat can be efficiently supplied to the lens element, particularly the front element, without impairing the optical properties of the lens element. The lens element can be heated in an efficient and uniform manner.

[0039] According to a preferred embodiment of the present invention, the heat transfer member contacts at least one lens element, particularly the front element, with one surface or preferably at least two surfaces. Preferably, the heat transfer member contacts at least one of the first and second surfaces, preferably the second surface, circumferentially along the side surface of the lens element. In this way, heat transfer to the lens element, particularly the front element, becomes particularly efficient and uniform. For example, the heat transfer member can be configured as a spacer ring that accommodates the lens element to be heated. By having the lens element in contact with at least two surfaces, the lens element can be positioned particularly accurately and stably through the spacer ring.

[0040] According to a preferred embodiment of the present invention, the lens mount includes a thermal insulator for thermally shielding a portion of the lens mount, particularly the lens holder, from a heating element and / or a heat transfer member disposed between the heating element and at least one lens element, particularly the front element. The thermal insulator ensures that the heat generated by the heating element does not damage other parts of the lens mount, particularly parts made of plastic material. Furthermore, the thermal insulator ensures that the generated heat is efficiently transferred to the at least one lens element being heated and not transferred to other parts of the optical lens configuration that do not require heating. For example, the thermal insulator can be disposed, particularly advantageously, between the heat transfer member and other parts of the lens mount, which may be made of metal. In this way, the heat flux through the material of the lens mount away from the heated lens element is reduced, and in particular, avoided.

[0041] According to a preferred embodiment of the present invention, the optical lens assembly includes wiring for supplying electrical energy to a heating element. Further components including wiring, particularly a housing, are not required.

[0042] According to a preferred embodiment of the present invention, the wiring is housed inside the lens mount, particularly within the lens mount wall. For example, the wiring may be arranged within the lens holder wall.

[0043] According to a preferred embodiment of the present invention, the wiring is embedded within the lens mount wall, particularly within the lens holder wall. For example, the wiring may be inserted through a cavity or embedded during the manufacture of the lens mount by overmolding the wiring by injection molding of the lens mount and / or its components, such as the lens holder. The wiring is protected from environmental influences and securely held in place.

[0044] Preferably, the heating element and wiring can be inserted or embedded inside the lens mount wall, particularly the lens holder wall, by overmolding the heating element and wiring when forming the lens mount, particularly the lens holder.

[0045] Particularly preferably, the wiring may be routed within the lens mount wall, especially the lens holder wall, to its end face facing the object side of the optical lens assembly. In particular, the wiring may be routed within the lens mount wall along substantially the entire length of the lens mount in the optical axis direction of the lens configuration, without compromising the lens configuration. In this way, the wiring can be easily routed to the back side of the optical lens assembly. This is particularly advantageous when the wiring exits the optical lens assembly from each end face. Particularly in camera applications, the wiring can be connected to the printed circuit board assembly of the camera module. This allows electrical energy to be supplied to the heating device via the printed circuit board assembly of the camera module.

[0046] The above-mentioned object of the present invention is also achieved by the optical lens assembly described in claim 13. This optical lens assembly comprises a lens mount having a lens mount wall defining an internal space, one or more lens elements disposed within the internal space of the lens mount, and a heating device having a heating element for heating at least one of the lens elements. Wiring for the heating device for supplying electrical energy to the heating element is disposed and, in particular, housed within the lens mount wall. Routing the wiring within the lens mount wall has the advantage that the routing of the wiring does not interfere with the lens elements disposed within the internal space of the lens mount. The wiring is protected from environmental conditions and any forces that may be applied to hold the lens elements in place.

[0047] The lens mount may include a lens cap and a lens holder, the latter of which is a lens barrel or includes a lens barrel. Particularly preferably, the lens mount wall is a lens holder wall, and more particularly, a lens barrel wall. Advantageously, the wiring is arranged within the lens holder wall, and more particularly, housed within the lens holder wall.

[0048] According to a preferred embodiment of the present invention, the wiring is housed in grooves in the lens mount wall, particularly in the lens holder wall. Preferably, the lens mount wall, particularly the lens holder wall, is manufactured to have grooves for housing the wiring. Thus, the wiring can be pre-installed before the assembly of the optical lens assembly. Preferably, the assembly of the optical lens assembly is not affected by the pre-installed wiring, so that, for example, an existing process can be used for assembly.

[0049] According to a preferred embodiment of the present invention, the wiring is embedded within the lens mount wall, particularly within the lens holder wall. For example, the wiring can be embedded during the manufacturing process of the lens mount, particularly the lens holder. For example, during the manufacturing of the lens mount, the wiring can be embedded by overmolding through injection molding of the lens mount and / or its components, such as the lens holder. This ensures particularly reliable protection of the wiring. The wiring may also be provided as an integral part with the lens mount, particularly the lens holder, such as its lens barrel.

[0050] According to a preferred embodiment of the present invention, the wiring is routed within the lens mount wall, particularly the lens holder wall, to the end face of the optical lens assembly facing the object side. In particular, the wiring can be routed within the lens mount wall substantially along the entire length of the lens mount in the direction of the optical axis of the lens configuration without impairing the lens configuration. Thus, the wiring can be easily routed to the back side of the optical lens assembly. This is particularly advantageous when the wiring exits from each end face of the optical lens assembly. Particularly in camera applications, the wiring can be connected to the printed circuit board assembly of the camera module. This allows electrical energy to be supplied to the heating device via the printed circuit board assembly of the camera module.

[0051] According to a preferred embodiment of the present invention, the lens cap is attached in a sealed state to the lens holder, particularly to the lens barrel, particularly via one or more sealing elements. For example, the lens cap may be attached in a sealed state using at least one O-ring. In this way, the optical lens assembly is particularly suitable for outdoor use, especially in humid conditions. The sealing performance achieved by at least one sealing element is not impaired even if wiring is routed from the lens cap or within the wall of the lens mount.

[0052] According to a preferred embodiment of the present invention, the wiring is routed radially from the lens holder, particularly via a through-barrel connector. For example, the wiring may be routed radially from the lens holder, particularly from the lens barrel. For example, the wiring may be arranged within the lens holder wall in the direction of the optical axis of the lens configuration, from the position of the heating element on the object side of the lens mount to an exit position away from the object side. At the exit position, the wiring may be routed radially from the lens mount, particularly from the lens holder. Particularly advantageous is that the wiring is routed via a through-barrel connector, which allows for easy connection of external components to the through-barrel connector.

[0053] A further objective of the present invention is to improve camera modules, particularly those used in automotive applications.

[0054] This objective is achieved by the camera module described in claim 17, which comprises the optical lens assembly described above. The advantages and preferred features of the camera module are consistent with the advantages and preferred features of the optical lens assembly. The camera module may incorporate any of the above features.

[0055] The camera module may include a printed circuit board assembly that includes an image sensor for sensing the image produced using the optical lens assembly, in addition to the optical lens assembly. Furthermore, the camera module may include a rear cover for covering the printed circuit board assembly on the opposite side of the optical lens assembly. Particularly preferably, the lens mount of the optical lens assembly comprises a lens holder having a lens barrel and a base portion, the base portion covering its object side of the printed circuit board assembly.

[0056] According to a preferred embodiment of the present invention, the camera module comprises a printed circuit board assembly having an image sensor, and a heating element is connected to the printed circuit board assembly to supply electrical energy to the heating element. This allows the camera module to be easily connected, particularly via a single connector, such as a FAKRA connector. For example, the connection can be established by wiring arranged within the lens mount wall, particularly within the lens barrel wall.

[0057] A further objective of the present invention is to improve camera systems, particularly those used in automotive applications.

[0058] This is achieved by the camera system described in claim 18. This camera system comprises the camera module and a camera housing in which the camera module is mounted. The camera housing may be implemented by a vehicle component. For example, the camera housing may be mounted behind a wing front panel (front fender panel). In such a camera system, the camera module can be used, for example, as a vehicle surround camera.

[0059] According to a preferred embodiment of the present invention, the camera module is detachably attached to the camera housing, particularly by a snap-fit ​​connection. This facilitates the installation, replacement, and maintenance of the camera module.

[0060] According to a preferred embodiment of the present invention, the camera housing includes housing wiring that supplies electrical energy to a heating element of the optical lens assembly. This simplifies the electrical connection of the heating element. In particular, it eliminates the need to incorporate complex wiring into the camera module. Particularly preferably, the camera housing may include a primary coil of an induction coil device that interacts with a secondary coil included in the heating element.

[0061] This disclosure also relates to further embodiments of optical lens assemblies, camera modules, and / or front elements for lens assemblies, which may constitute independent embodiments of the present invention, either alone or in combination with other embodiments.

[0062] According to one aspect of the disclosed technology, the heating element may be attached to one of the lens elements, particularly the front element, or as part thereof.

[0063] In the disclosed embodiments, the heating element may comprise a transparent conductor, such as a conductive coating, preferably a conductive coating of PEDOT. Such a conductive coating can cover at least a portion of the side surface. It is also possible that the conductive coating covers at least a portion of the first and / or second surface. Preferably, heating consists only of heating elements arranged circumferentially along the side surface of the front element. Particularly preferably, the heating element is realized by a circumferentially arranged heating resistor, in particular by a heating wire wound circumferentially along the side surface. Advantageously, the heating element is not located on either the first or second surface, but only circumferentially along the side surface.

[0064] According to one aspect of the disclosed technology, the heating element is recessed inward relative to the radial extension of the side surface. This improves heat transfer from the heating element to the front element, particularly the portion near the optical axis. Furthermore, recessing the heating element stabilizes its position and improves protection by the front element.

[0065] According to one aspect of the disclosed technology, the heating element is arranged in a groove formed circumferentially along the side surface. This allows for particularly reliable placement of the heating element. The heating element is housed in the groove and held in a predetermined position with respect to its radial and axial positions circumferentially along the side surface.

[0066] According to one aspect of the disclosed technology, the heating element is at least partially embedded in the optical material of the front element. For example, the groove in which the heating element is embedded may be closed by the optical material of the front element. This further improves the heat transfer and stability of the heating element. For example, the heating element may be embedded in the optical material except for the lead-out portion necessary for connecting the heating element to electrical wiring. Furthermore, the opening in the embedded portion may be used for heat dissipation.

[0067] According to one aspect of the disclosed technology, the heating element is completely embedded in the optical material of the front element. The heating element is securely located and protected within the front element. For example, the heating element may be the secondary coil of an induction coil device. In this way, the electrical energy required to operate the heating element can be supplied without lead wires or wiring emanating from the front element. The primary coil of the induction coil device may be located inside the lens cap or even outside the optical lens assembly. This further simplifies the wiring required to connect the optical lens assembly to the electrical energy source.

[0068] According to one aspect of the disclosed technology, a front element for an optical lens assembly comprises a first surface facing the object, a second surface opposite to the first surface, a side surface connecting the first and second surfaces, and a heating element. The heating element is circumferentially positioned along the side surface and recessed inward with respect to the radial extension of the side surface. The front element can be efficiently heated by the integrated heating element. The heating element is reliably positioned along the side surface of the front element without impairing the optical properties of the front element. The front element may have any of the features described above with respect to the front element. In particular, the front element may have a groove formed circumferentially along the side surface, in which the heating element is positioned. The heating element may be at least partially, and especially completely, embedded in the optical material of the front element.

[0069] According to one aspect of the disclosed technology, an optical lens element for an optical lens assembly, particularly a front element, may comprise a heating element having a transparent conductor on at least one of its first and / or second surfaces. In particular, the front element may comprise a transparent conductive coating of PEDOT. The PEDOT coating can be applied particularly preferably by inkjet printing, which allows for precise application of the transparent conductive coating. In addition, or alternatively, a transparent conductor in the form of a metal mesh may be applied to at least a portion of the first and / or second surfaces of the front element. Using a PEDOT coating and / or a metal mesh as a transparent conductor on at least a portion of the first and / or second surfaces of the front element is an independent aspect of the inventive technology described herein.

[0070] The disclosed technology also refers to an optical lens assembly comprising a lens mount, one or more lens elements positioned inside the lens mount, and a heating device for heating at least one of the one or more lens elements, wherein the heating element is positioned within the lens mount. The lens mount comprises a lens holder and a lens cap attached to the lens holder on the object side of the optical lens assembly. Wiring for the heating device to supply electrical energy to the heating element exits the lens mount through the lens cap. By routing the wiring out of the lens cap, there is the advantage that the wiring does not need to be routed inside the lens mount, particularly inside the lens holder. Therefore, the wiring does not interfere with one or more lens elements. Furthermore, the sealing of the optical lens assembly is not impaired by the wiring. Particularly advantageous is that the sealing between the lens cap and the lens holder can be easily achieved without being affected by the wiring. The wiring exiting the lens cap does not require separate sealing. As a result, electrical connections are easy to establish and highly reliable. The manufacturing process is simplified and manufacturing costs are reduced. Preferably, the wiring can exit the lens mount through an opening in the lens cap, particularly an opening on the side of the lens cap. The opening may, but may not, be sealed or waterproofed, especially if a heating element is located inside the lens cap.

[0071] Further details, features, and advantages of the present invention can be found in the description of exemplary embodiments with reference to the drawings. [Brief explanation of the drawing]

[0072] [Figure 1] This diagram schematically shows one embodiment of a camera module. [Figure 2] This figure schematically shows an exploded view of the camera module shown in Figure 1. [Figure 3] This figure schematically shows a longitudinal section of the camera module through the optical lens assembly shown in Figure 1. [Figure 4]This figure schematically shows the front elements of the optical lens assembly in the camera module shown in Figure 1. [Figure 5] This figure schematically shows a cross-section of the front element in Figure 4. [Figure 6] This diagram schematically illustrates a further embodiment of the camera module. [Figure 7] This figure schematically shows a partial cross-section of an optical lens assembly according to a further embodiment. [Figure 8] This diagram schematically shows one embodiment of a camera system including a camera module. [Figure 9] This is a schematic diagram (part 1) illustrating a further embodiment of the camera system. [Figure 10] This is a schematic diagram (part 2) illustrating a further embodiment of the camera system. [Figure 11] This figure schematically illustrates a further embodiment of a front element for an optical lens assembly. [Figure 12] This figure schematically shows a cross-section of the front element in Figure 11. [Figure 13] This figure schematically illustrates a further embodiment of the front element of an optical lens assembly. [Figure 14] This figure schematically shows a cross-section of the front element in Figure 13. [Figure 15] This is a schematic cross-sectional view showing some of further embodiments of the optical lens assembly. [Figure 16] This is a schematic partial cross-sectional view of a camera system according to another embodiment during assembly. [Figure 17] This is a schematic partial cross-sectional view of the camera system after assembly, as shown in Figure 16. [Figure 18] This is a schematic diagram (part 1) showing a further embodiment of the camera module. [Figure 19] This is a schematic diagram (part 2) showing a further embodiment of the camera module. [Figure 20] This is a schematic diagram (part 1) showing a further embodiment of a front element for an optical lens assembly. [Figure 21]This is a schematic diagram (part 2) showing a further embodiment of a front element for an optical lens assembly. [Figure 22] This is a schematic diagram (part 1) showing a further embodiment of the camera module. [Figure 23] This is a schematic diagram (part 2) showing a further embodiment of the camera module. [Figure 24] This is a schematic diagram (part 3) showing a further embodiment of the camera module. [Figure 25] This is a schematic diagram (part 4) showing a further embodiment of the camera module. [Modes for carrying out the invention]

[0073] In each figure and embodiment, corresponding parts are identified by the same reference number. Parts of functionally similar but structurally different embodiments are given the same reference number with the letters "a", "b", ... appended.

[0074] A first embodiment of the camera module 1 will be described with reference to Figures 1 to 5. The camera module 1 can be used for in-vehicle applications such as a rear-view camera or a vehicle surround camera. The camera module 1 comprises an optical lens assembly 2, a printed circuit board (PCB) assembly 3, and a rear cover 4. The printed circuit board assembly 3 includes an image sensor 5 for detecting an image of an object captured via the optical lens assembly 2.

[0075] The optical lens assembly 2 comprises a lens mount 6 having a lens holder 7 and a lens cap 8. The lens holder 7 may comprise a base portion 9 and a lens barrel 10. Inside the lens mount 6 is a lens configuration (lens arrangement) 11. The lens configuration 11 comprises a plurality of lens elements 12 located within the lens holder 7, particularly within its lens barrel 10. The lens configuration 11 further comprises a front element (front lens element) 13 located on the object side of the camera module 1. The object side is the side on which the object to be imaged by the optical lens assembly is located. In Figure 3, the object side is the left side of the optical lens assembly 2. In other words, the front element 13 is the outermost lens element of the lens configuration 11. The front element 13 terminates the lens configuration 11 to the surrounding environment. The front element 13 is affected by the environment, particularly weather conditions such as frost, rain, and / or clouds.

[0076] The front element 13 is positioned at the object-side end of the lens holder 7. In the illustrated embodiment, the front element 13 is positioned between the lens cap 8 and the lens holder 7. The lens cap 8 is attached to the lens holder 7 on the object side of the lens assembly 11. The front element 13 is held in place by the lens cap 8. The lens cap 8 includes a projection 14 that interacts with a retaining portion 15 formed on the front element 13. The retaining portion 15 is formed as a radially projecting portion of the front element 13.

[0077] The lens cap 8 is attached to the lens holder 7 in a sealed manner using an O-ring circumferential sealing element 16. This prevents humidity and other contaminants from entering the lens holder 7 and impairing the performance of the camera module 1, particularly the optical lens assembly 2.

[0078] To reduce environmental impacts on the front element 13, such as frost and / or fogging, the optical lens assembly 2 includes a heating device 17. The heating device 17 includes a heating element 18 for heating the front element 13. In the illustrated embodiment, the heating element 18 is integrated with the front element 13. The heating device 17 further includes wiring 19 for supplying electrical energy to the heating element 18.

[0079] As can be seen particularly from Figures 4 and 5, the front element 13 has a first surface 20 facing the object side of the lens configuration 11. The first surface 20 is the outer surface of the front element 13. The front element further has a second surface 21 opposite to the first surface 20. The second surface 21 faces the other lens elements 12 of the lens configuration 11 and forms the inner surface of the front element 13. The first surface 20 and the second surface 21 are connected by a side surface 22. The side surface 22 extends substantially along the optical axis L of the lens configuration 11 (see Figure 3).

[0080] The heating element 18 is circumferentially arranged along the side surface 22. The heating element 18 is recessed inward relative to the radial extension of the side surface 22. A groove 23 is formed in the side surface 22, and the heating element 18 is housed within it. The heating element 18 is protected within the groove 23. In particular, the heating element 18 is not affected by forces applied through the lens cap 8 and / or other lens elements 12. In particular, the heating element 18 is not affected by the relative movement between the front element 13 and the lens cap 8. Furthermore, the heating element 18 is not affected by the environment. Because the heating element 18 is circumferentially arranged along the side surface 22, it does not protrude into the optical path through the front element 13. Therefore, the heating element 18 directly heats the front element 13 without affecting the optical properties of the front element 13.

[0081] The arrangement of the heating element 18 has the further advantage that it does not interact with or impair any of the coatings on the front element 13, particularly its first surface 20. Therefore, the scratch resistance and other properties that can be achieved by such a coating can be improved.

[0082] In the illustrated embodiment, the heating element 18 includes a heating wire 24 wound around a side surface 22 within a groove 23. A lead-out 59 of the heating wire 24 can be connected to wiring 19 for supplying electrical energy to the heating wire 24.

[0083] The wiring 19 may include lead wires 25 that are drawn out from the lens cap 8 and connected to the connector 26. The lead wires 25 may consist of or be formed by flex-tail lead wires. The lead wires 25 are routed out of the lens cap 8 through an opening 27 on the side of the lens cap 8. In this way, the routing of the lead wires 25 does not impair the sealed connection of the lens cap 8 to the lens holder 7. The routing of the wiring 19, in particular the lead wires 25, is simplified. A particular advantage is that the opening 27 does not need to be waterproofed. Waterproofing can be easily achieved by the sealing element 16 between the lens cap 8 and the lens holder 7.

[0084] Further embodiments of the camera module 1a will be described with reference to Figure 6. The camera module 1a differs from the embodiments described with reference to Figures 1 to 5 only in the wiring 19a. The wiring 19a is formed by pigtail leads 28.

[0085] Further embodiments of the optical lens assembly 2b will be described with reference to Figure 7. The optical lens assembly 2b can be used, for example, in a camera module as shown in the previous figure. The lens mount 6b comprises a lens cap 8b and a lens holder 7b, which are sealed to the lens holder 7b via a sealing element 16. The lens mount houses a lens configuration 11 having a plurality of lens elements 12 and a front element 13b. A heating element 18b is positioned around the side surface 22b of the front element 13b in the area of ​​the retaining portion 15. The heating element 18b is composed of a clampable conductor and is compressed between a projection 14 of the lens cap 8b and the retaining portion 15. The heating element 18b is pulled out of the lens cap 8b through an opening 27b. The opening 27b may or may not be waterproof. The heating element 18b is connected to wiring 19b with a waterproof flat-blade connector 29.

[0086] An embodiment of the camera system 30 will be described with reference to Figure 8. The camera system 30 comprises a camera module 1c and a camera housing 31. The camera housing 31 includes a retaining means 32 for holding the camera module 1c. In the illustrated embodiment, the retaining means 32 includes a snap-fit ​​projection 33 for detachably connecting to a snap-fit ​​recess 34 of the camera module 1c. The camera system 30 can be positioned, for example, behind the wing front panel 35 of a vehicle.

[0087] The camera module 1c can correspond in particular to the camera module described in the earlier embodiment. For example, the optical lens assembly 2c can correspond to the optical lens assembly described with reference to Figure 7.

[0088] The heating device wiring 19c of the camera module 1c is connected to the housing wiring 36 of the camera housing 31. This provides a particularly easy-to-connect and reliable electrical connection. In the illustrated embodiment, the wiring 19c can be made up of, for example, a flat-blade connector 29c for connecting to the housing wiring 36.

[0089] Further embodiments of the camera system 30d will be described with reference to Figure 9. The camera system 30d differs from the camera system 30 of Figure 8 in that the retaining means 32d provides more radial space around the optical lens assembly to accommodate the flat-blade connector 29c that connects to the housing wiring 36d.

[0090] Further embodiments of the camera system 30e will be described with reference to Figure 10. The camera system 30e comprises a camera module 1e and a camera housing 31e. Connection to the housing wiring 36e is made via a pad connector 37 formed on the side of the lens cap 8e. This facilitates electrical connection when attaching the camera module 1e to the camera housing 31e.

[0091] Further embodiments of the front element 13f will be described with reference to Figures 11 and 12. The front element 13f differs from the front element 13 only in that the heating element 24 is embedded in the optical material of the front element 13f. Only the lead-out portion 59 of the heating element 24 extends from the optical material of the front element 13f. This embedding can be achieved, for example, by at least partially blocking or embedding the groove in which the heating element 18 is placed. This improves the protection of the heating element 18, in particular the heating element 24.

[0092] Further embodiments of the front element 13g will be described with reference to Figures 13 and 14. The front element 13g differs from the heating element 18 described with reference to Figures 4 and 5 in that it does not have a heating element 18g. The heating element 18g does not have a lead-out for electrically connecting to another wiring. Instead, the heating wire 24g is short-circuited to form a closed coil 40. The closed coil 40 functions as a secondary coil in an induction coil device for inducing current in the heating wire 24. Therefore, no mechanical connection is required to supply electrical energy to the heating wire 24. This simplifies placement and improves the reliability of the heating element 18g. In other embodiments, the heating element 18g may be completely embedded within the optical material of the front element (for example, as shown in reference to Figures 11 and 12). In such cases, since electrical energy is supplied by induction, no lead-out from the optical material is required.

[0093] Further embodiments of the optical lens assembly 2h are described with reference to Figure 15. The front element 13h comprises a heating element 18h in the form of a fully embedded secondary coil 40h. A primary coil 41 is housed within the lens cap 8h for inducing current in the secondary coil 40h of the heating element 18h. Electrical energy is supplied to the primary coil 41 via wiring 19h drawn out from the lens cap 8h.

[0094] The embodiment shown in Figure 15 illustrates an exemplary heating coil device comprising a primary coil 41 and a secondary coil 40h. In the illustrated embodiment, the primary coil 41 is housed in the lens cap 8h. In other embodiments, the primary coil may be embedded in the lens cap wall of the lens cap. The primary coil may also be incorporated into other parts of the optical lens assembly, such as the lens holder, particularly the lens barrel. In yet another embodiment, the primary coil can be realized outside the optical lens assembly, particularly outside the camera module. For example, the primary coil may be part of the camera housing.

[0095] Further embodiments of the camera system 30i will be described with reference to Figures 16 and 17. The camera system 30i comprises a camera module 1i and a camera housing 31i. Figure 16 shows the camera module 1i before it is attached to the camera housing 31i. To attach the camera module 1i, it is inserted into the camera housing 31i in the direction indicated by arrow A in Figure 16. Once inserted, the snap-fit ​​projection 33 engages with the snap-fit ​​recess 34. Figure 17 shows the assembled camera system 30i, i.e., the camera module 1i attached to the camera housing 31i.

[0096] In Figures 16 and 17, the camera system 30i is shown partially cut out to highlight the details of the camera housing 31i and camera module 1i. The camera housing 31i is located behind the wing front panel 35 of the automobile. The wing front panel 35 has a notch 42, and when the camera module 1i is mounted on the camera housing 31i, the front element 13i is positioned behind the notch. To enhance sealing, an O-ring-shaped sealing member 43 is positioned around the notch 42.

[0097] The camera housing 31i includes housing wiring 36i consisting of lead wires 44, a connector 45, and a primary coil 41i. The primary coil 41i is embedded within the camera housing 31i. The primary coil 41i interacts with a secondary coil 40i that forms an induction coil device. The secondary coil 40i forms a heating element 18i of the optical lens assembly 2i of the camera module 1i. Therefore, the camera module 1i, and in particular its optical lens assembly, does not require wiring to supply electrical energy to the heating element 18i. The heating element 18i may be housed, for example, within the lens cap, particularly within the wall of the lens cap, or it may be placed in a groove of the front element 13i or embedded within the front element 13i.

[0098] Figure 18 shows a further embodiment of an optical lens assembly 2j for a camera module. The optical lens assembly 2j comprises a heating device 17j having a heating element 18j and wiring 19j. The wiring 19j serves to supply electrical energy to the heating element 18j. The heating element 18j and wiring 19j are embedded in the lens holder wall 50 of the lens holder 7j, in particular the lens barrel 10j. In this way, the heating element 18j and wiring 19j are securely positioned within the lens holder 7j. For example, the lens holder 7j can be formed by injection molding, thereby overmolding the heating element 18j and wiring 19j. Alternatively, the heating element 18j and / or wiring 19j can be inserted into the cavity of the lens holder 7j.

[0099] The wiring 19j passes through the lens holder 7j and is routed to the end face of the lens configuration 11j facing the object side. This allows the wiring 19j to be connected to the printed circuit board of the camera module's printed circuit board assembly. No external connection is required.

[0100] In the illustrated embodiment, the heating element 18j is embedded in the lens holder wall 50. In other embodiments, the primary coil of the induction coil device may be embedded in the lens holder wall. The secondary coil of the induction coil device, which is composed of or forms the heating element, may be arranged circumferentially around the front element.

[0101] Further embodiments of the camera module 1k will be described with reference to Figure 19. The camera module 1k comprises a lens holder 7k with a lens barrel 10k. A through-barrel connector 51 is provided for drawing out wiring for the heating device of the optical lens assembly 2k. The through-barrel connector 51 can function as a connector for connecting other wiring, such as housing wiring of the camera housing. The through-barrel connector 51 can be connected to wiring embedded in the lens holder wall 50k of the lens holder 7k, for example. For example, the entire heating device, particularly the heating element and wiring, may be embedded in the lens holder wall 50k and connected to the through-barrel connector 51.

[0102] Further embodiments of the front element 13l are described with reference to Figure 20. The front element 13l includes a heating element 18l formed as a transparent conductor on a first surface 20l facing the object. The transparent coating may be formed of PEDOT, which has superior optical and electrical properties compared to ITO, which is commonly used for conductive coatings. Particularly preferably, the PEDOT coating can be applied to the first surface 20l of the front element 13l using PEDOT inkjet printing. The conductive coating can be applied alternatively or additionally to the heating element's heating wires, which are arranged circumferentially along the side surface 22l of the front element 13l.

[0103] The front element 13l can be combined with any of the camera modules described above. Particularly preferably, the front element 13l can be combined with wiring extending from the lens cap. This is particularly advantageous because the coating 18l is positioned on the object side of the front element 13l, avoiding complex wiring around the front element 13l.

[0104] Instead of coating with PEDOT, other transparent conductors may be used. For example, a transparent conductor made of metal mesh may be used.

[0105] Referring to Figure 21, a further embodiment of the front element 13m will be described. The front element 13m differs from the front element 13l in Figure 20 in that the conductive coating is applied only in a ring shape, rather than to the entire first surface 20m of the front element 13m. The central part of the first surface 20m is open, thereby not obstructing the optical path most relevant to imaging.

[0106] Figure 22 shows a further embodiment of the camera module 1n. The camera module includes an optical lens assembly 2n connected to the rear cover 4 via a lens holder 7n.

[0107] The lens mount 6n comprises a lens holder 7n and a lens cap 8n attached to the lens holder 7n. The heating element 18n of the heating device 17n is housed within the wall of the lens mount 6n. In the illustrated embodiment, the heating element 18n is positioned within an annular space 53 formed between the lens cap 8n and the lens holder 7n. The heating element 18n does not directly contact the front element 13n of the lens configuration 11n.

[0108] The heat transfer member 54 is positioned between the heating element 18n and the side surface of the front element 13n, and conducts heat from the heating element 18n to the front element 13n. The heat transfer member 54 is a metal ring made of, for example, aluminum and / or brass, and surrounds the front element 13n along its side surface.

[0109] The wiring 19n is routed within the lens holder wall 50n to the end face 52 of the lens mount wall 50n facing the object side of the optical lens assembly 2n. At the end face 52, the wiring 19n exits the lens mount wall 50n and connects to the printed circuit board assembly 3 on which the image sensor 5 is mounted. In this way, the connection between the camera module 1n and other circuits can be made via a single connector 55. The connector 55 functions for data exchange, particularly image data exchange, and for supplying electrical energy to the camera module, particularly the heating device 17n and other components of the printed circuit board assembly 3, such as the image sensor 5. The connector 55 may be, for example, a FAKRA connector.

[0110] In the illustrated embodiment, the wiring 19n is arranged in a wiring groove 56 formed in the lens holder wall 50n. The wiring groove 56 may be pre-formed in the lens holder wall 50n, and the wiring 19n can be inserted into the pre-formed wiring groove 56. For example, the lens holder 7n can be made of metal, particularly aluminum, which improves heat dissipation from the printed circuit board assembly 3, especially the image sensor 5.

[0111] It is also possible to form the lens holder 7n from a plastic material. In this case, it is particularly possible to embed the wiring 19n within the lens holder wall 50n by overmolding the wiring 19n during injection molding of the lens holder 7n.

[0112] A thermal insulator 57 is placed between the lens holder 7n and the heat transfer member 54. This reduces the heat generated via the heating element 18n from diffusing to other parts of the lens mount 6n. The heat is efficiently transferred to the front element 13n. For example, if the lens holder 7n is made of metal, especially aluminum, the heat will dissipate to other parts of the lens holder 7n. If the lens holder 7n is made of plastic, damage to the plastic material by the heat of the heating element is avoided.

[0113] The heat transfer member 54 and the thermal insulator 57 are part of the lens mount 6. The heating element 18n is housed between the lens cap 8n, the lens holder 7n, the heat transfer member 54, and the thermal insulator 57.

[0114] The heat transfer member 54 and the thermal insulator 57 may be pre-positioned in the lens holder 7n, particularly in a shape-fitting manner. In the illustrated embodiment, the thermal insulator 57 is positioned in a groove on the front surface of the lens mount 6n, and the heat transfer member 54 has projections that engage with the thermal insulator 57 positioned in the groove.

[0115] Since the heating element 18n is securely housed within the lens mount wall, particularly within the annular space 53, the heating element 18n is reliably protected from environmental influences. Furthermore, the heating element 18n can be easily connected to the wiring 19n without impairing the sealing properties of the optical lens assembly 2n. Particularly preferred is that the positioning and arrangement of the lens element 12 within the lens mount 6n are not impaired by the heating device 17n, particularly its heating element 18n. Advantageously, the front element 13n can be positioned within the lens mount without the need to connect the heating element 18n to the lens mount.

[0116] An O-ring shaped sealing element 16n is positioned between the lens cap 8n and the front element 13n.

[0117] The lens cap 8n is equipped with a sealing member 43n on its outer circumference. The sealing member 43n provides a seal when the camera module 1n is inserted into the camera housing (for example, in an automotive application).

[0118] Figure 23 shows a further embodiment of camera module 1o. Since camera module 1o is similar to camera module 1n, the corresponding components will not be described in detail again.

[0119] Camera module 1o differs from camera module 1n only in the details of the optical lens assembly 2o, particularly in the way in which the heating element 18n is housed within the lens mount wall of the lens mount 6o. The heating element 18n is located in the annular space 53o between the lens cap 8n and the lens mount 7o. The lens mount 7o includes a projection 58 that contacts the side surface of the front element 13n. The projection 58 covers the heating element 18n, shielding it from the front element 13n as well as the external environment.

[0120] In a preferred modification of the camera module 1o, the lens mount 7o may be made of metal, particularly aluminum. In this way, the protrusion 58 functions as a heat transfer member for transferring heat to the front element 13n.

[0121] However, it is also possible to manufacture the lens 7o from a plastic material. In this case, in particular, the wiring 19n can be embedded in the material of the lens mount wall 50o by overmolding the wiring 19n. Furthermore, the front end components of the lens holder 7o, in particular the protrusion 58, may be formed from another plastic material having particularly good thermal conductivity. For example, different components of the lens holder 7o may be formed using multi-component injection molding.

[0122] The thermal insulator 57o is placed between the heating element 18n and the lens cap 8n. This reduces heat dissipation from the front element 13n. Heating of the front element 13n is particularly efficient. The thermal insulator 57o may be made of, for example, a plastic material. The thermal insulator 57o can be formed integrally with the lens mount 7o, for example, by multi-component injection molding. It is also possible to attach the thermal insulator 57o to the lens holder 7o, particularly by overmolding the heating element 18n.

[0123] Figure 24 shows a further embodiment of camera module 1p. Since camera module 1p is similar to camera module 1n, the corresponding components will not be described in detail again.

[0124] Camera module 1p differs from camera module 1n in the details of the optical lens assembly 6p, particularly in the way in which the heating element 18n is housed within the lens mount wall of the lens mount 6p. The heating element 18n is positioned between a portion of the lens holder wall 50p and a spacer ring 60 used to position the front element 13n. The spacer ring 60 can preferably be made of metal, particularly aluminum and / or brass. Thus, the spacer ring 60 functions as a heat transfer member for transferring heat to the front element 13n. Particularly preferably, the spacer ring 60 can contact the front element 13n along multiple surfaces, such as the side edge of the second surface opposite to the object side of the optical lens configuration 2p. In this way, the heat is distributed particularly efficiently and uniformly to the front element 13n.

[0125] In the illustrated embodiment, the spacer ring 60 also contacts another lens element 12 of the lens configuration 11n. In this way, the other lens element 12 can also be heated via the heating element 18n.

[0126] A gap 61 is formed between the spacer ring 60 and a portion of the lens holder wall 50p. The gap 61 acts as thermal insulation between the spacer ring 60 and the rest of the lens holder wall 50p, resulting in efficient heat transfer to the front element 13n.

[0127] Figure 25 shows a further embodiment of camera module 1q. Camera module 1q is substantially identical to camera module 1p shown in Figure 24.

[0128] The optical lens assembly 2q of the camera module 1q differs from the optical lens assembly 2p only in the configuration of the spacer ring 60q. The spacer ring 60 consists of two parts: a heat transfer member 54q formed of a metal part and a thermal insulator 57q. The heat transfer member 54q contacts the front element 13n at least around its sides. In the illustrated embodiment, the heat transfer member 54q also contacts the front element 13n on a second surface opposite to the object side of the optical lens configuration 11n. The thermal insulator 57q is placed between the heat transfer member 54q and a portion of the lens mount wall 50p. In this way, thermal insulation is improved. Heat transfer to the front element 13n is particularly efficient. [Explanation of Symbols]

[0129] 13 Front element (front lens element) 1, 1a, 1c, 1e, 1i, 1k, 1n, 1o, 1p, 1q Camera Modules 2, 2b, 2c, 2h, 2i, 2j, 2k, 2n, 2o, 2p, 2q Optical Lens Assembly 3. Printed circuit board assembly 4. Back cover 5 Image Sensors 6, 6b, 6n, 6o, 6p lens mount 7, 7b, 7j, 7k, 7n, 7o Lens Holder 8, 8b, 8e, 8h, 8n lens caps 9 Base section 10, 10j, 10k lens barrel 11, 11j, 11n lens configuration 12 lens elements 13, 13b, 13f, 13g, 13h, 13i, 13l, 13m, 13n front element 14 Protrusion 15 Holding part 16, 16n sealing elements 17, 17j, 17n heating device 18, 18b, 18g, 18h, 18i, 18j, 18l, 18n heating element 19, 19a, 19b, 19c, 19h, 19j, 19n wiring 20, 20l, 20m 1st side 21 Side 2 22, 22b, 22l side 23 Groove 24, 24g heating wire 25 Lead wires 26 connectors 27, 27b opening 28 Pigtail Reeds 29, 29c flat blade connector 30, 30d, 30e, 30i camera system 31, 31e, 31i Camera Body 32, 32d holding means 33 Snap-fit ​​protrusions 34 Snap-fit ​​recess 35 Wing Front Panel 36, 36d, 36e, 36i enclosure wiring 37 Pad Connectors 40, 40h, 40i secondary coil 41, 41i Primary Coil 42 Notches 43, 43n sealing member 44 Lead wires 45 connectors 50, 50k, 50n, 50p lens holder wall 50n, 50o, 50p lens mount wall 51 Through-tube connector 52 End face 53, 53o Circular space 54, 54q Heat transfer element 55 Connectors 56 Wiring groove 57, 57o, 57q thermal insulators 58 Protrusion 59 Drawer section 60, 60q spacer 61 gap L optical axis

Claims

1. In particular, optical lens assemblies (2i; 2j; 2k; 2n; 2o; 2p; 2q) for camera modules (1i; 1k; 1n; 1o; 1p; 1q), 1.

1. Lens mount (6j; 6k; 6n; 6o; 6p; 6q), 1.

2. A lens configuration (11j; 11n) consisting of one or more lens elements (12) arranged inside the lens mount (6j; 6k; 6n; 6o; 6p; 6q), and 1.

3. A heating element (18i; 18j; 18n) for heating at least one of the one or more lens elements (12), particularly the front element (13i; 13j; 13n) located on the object side of the lens configuration (11; 11j; 11n), 1.

4. An optical lens assembly wherein the lens mount (6j; 6k; 6n; 6o; 6p; 6q), in particular its lens holder (7j; 7k; 7n; 7o; 7p), comprises a lens mount wall (50; 50k; 50n; 50o; 50p) defining an internal space for housing one or more lens elements (12) of the lens configuration (11j; 11n), and the heating element (18i; 18j; 18n) is housed within the lens mount wall (50; 50k; 50n; 50o; 50p).

2. An optical lens assembly (2i; 2j; 2k; 2n; 2o; 2p; 2q), An optical lens assembly in which the heating elements (18i; 18j; 18n) are housed within the lens mount wall (50; 50k; 50n; 50o; 50p) so as not to come into direct contact with one or more lens elements (12; 13i; 13j; 13n).

3. According to claim 1 or 2, the lens configuration (11j; 11n) comprises the front element (13i; 13j; 13n) located on the object side of the lens configuration (11j; 11n), the front element (13i; 13j; 13n) comprising a first surface (20) facing the object side, a second surface (21) opposite to the first surface, and a side surface (22) connecting the first surface (20) and the second surface (21), and the heating element (18i; 18j; 18n) is circumferentially arranged along the side surface (22) of the front element (13i; 13j; 13n).

4. The optical lens assembly (2i; 2j; 2k; 2n; 2o; 2p; 2q) according to any one of claims 1 to 3, wherein the heating elements (18j; 18n) are embedded in the lens mount wall (50; 50k; 50n; 50o; 50p) in particular by overmolding the heating elements (18j; 18n).

5. The lens mount (6n; 6o;) comprises a lens holder (7n; 7o;) and a lens cap (8n), the lens cap (8n) being attached to the lens holder (7n; 7o; 7p) on the object side of the optical lens assembly (2n; 2o), The optical lens assembly (2n; 2o) according to any one of claims 1 to 4, wherein the heating element (18n; 18p) is positioned between the lens cap (8n) and the lens holder (7n; 7o), and in particular within an annular space (53; 53o) formed between the lens cap (8n) and the lens holder (7n; 7o).

6. The optical lens assembly (2n; 2o; 2p; 2q) according to any one of claims 1 to 5, wherein the lens mount (6n; 6o; 6p; 6q) comprises a heat transfer member (54; 54q; 58; 60) disposed between the heating element (18n) and at least one of the one or more lens elements (12) included in the lens configuration (11n), particularly between the front element (13n).

7. The optical lens assembly (2p; 2q) according to claim 6, wherein the heat transfer member (54; 54q; 60) is part of a spacer ring (60; 60q) that accommodates at least one of the one or more lens elements (12), in particular the front element (13n).

8. The optical lens assembly (2n; 2p; 2q) according to claim 6 or 7, wherein the heat transfer member contacts the front element (13n) of the lens configuration (11n) at least in the circumferential direction along the side surface of the front element (13n).

9. The optical lens assembly (2p; 2q) according to any one of claims 6 to 8, wherein the heat transfer member is in contact with at least two surfaces of the front element (13n).

10. The optical lens assembly (2n;2p;2q) according to any one of claims 1 to 9, wherein the lens mount (2n;2p;2q) comprises a thermal insulator (57;57o;57q) for thermally shielding the components of the lens mount (6n, 6o;6q), particularly the lens holder (7n;7p), from the heating element (18n) and / or a heat transfer member (54;54q) disposed between the heating element (18n) and one of the one or more lens elements (12).

11. The heating element (18j) is provided with wiring (19j) for supplying electrical energy, The optical lens assembly (2j;2k;2n;2o;2p;2q) according to any one of claims 1 to 10, wherein the wiring (19j;19k) is housed within the lens mount wall (50;50k).

12. The optical lens assembly (2j; 2k; 2n; 2o; 2p; 2q) according to claim 11, wherein the wiring (19j) is arranged within and particularly embedded in the lens mount wall (50; 50k; 50n; 50o; 50p).

13. In particular, optical lens assemblies (2j; 2k; 2n; 2o; 2p; 2q) for camera modules (1; 1a; 1c; 1e; 1i; 1k), 13.

1. Lens mount (6j;6k;6n;6o;6p;6n) having lens mount walls (50;50k;50n;50o;50p) that define the internal space, 13.

2. One or more lens elements (12; 13j) arranged in the internal space of the lens mount (6j; 6k), and 13.

3. Equipped with a heating device (17j; 17n), The heating device (17j; 17n) is 13.3.

1. Heating elements (18j; 18n) for heating at least one of the one or more lens elements (12; 13j; 13n), and 13.3.

2. The heating element (18j; 18n) has wiring (19j; 19n) for supplying electrical energy, The aforementioned wiring (19j; 19n) is arranged within the optical lens assembly (2j; 2k; 2n; 2o; 2p; 2q) within the lens mount wall (50; 50k; 50n; 50o; 50p).

14. The optical lens assembly (2j;2n;2o;2p;2q) according to claim 13, wherein the wiring (19j;19n) is embedded within the lens mount wall (50;50k;50n;50o;50p), and is embedded particularly by injection molding the lens mount wall (50;50k;50n;50o;50p) around the wiring (19j;19n).

15. The optical lens assembly (2j;2n;2o;2p;2q) according to claim 13 or 14, wherein the wiring (19j;19n) is arranged within the lens mount wall (50;50n;50o;50p) to the end face of the lens mount wall facing the object side of the optical lens assembly (2j;2n;2o;2p;2q).

16. The heating element (18j; 18n) is housed within the lens mount wall (50; 50k; 50; 50n; 50o; 50p), particularly within the lens holder wall (50; 50k), and is particularly embedded within the optical lens assembly (2j; 2k; 2n; 2o; 2p; 2q) according to any one of claims 13 to 15.

17. A camera module, particularly for automotive use, comprising an optical lens assembly (2i; 2j; 2k; 2n; 2o; 2p; 2q) according to any one of claims 1 to 16 (1i; 1k; 1n; 1o; 1p; 1q).

18. The printed circuit board assembly (3) includes an image sensor (5), The camera module (1n; 1o; 1p; 1q) according to claim 17, wherein the heating element (18j; 18n) is connected to the printed circuit board assembly for supplying electrical energy to the heating element (18j; 18n).

19. Camera systems, especially in-vehicle camera systems, 19.

1. Camera module (1i; 1k; 1n; 1o; 1p; 1q) according to claim 17 or 18, and 19.

2. A camera system comprising a camera housing to which the camera modules (1i; 1k; 1n; 1o; 1p; 1q) are attached.

20. The camera system according to claim 19, wherein the camera module (1i; 1k; 1n; 1o; 1p; 1q) is detachably attached to the camera housing, and in particular is attached by a snap-fit ​​connection.

Images