Lens system

Abstract

The invention relates to a lens system (1) which can interact with a light source (2), comprising a holding device (3) which has a contact area (8), a starting portion (3a), an end portion (3c) and a holding portion (3b) for holding at least one lens (4), in which a locking element (5) is provided which can be fastened to the end portion (3c) of the holding device (3), the locking element (5) has a spring element (6), the at least one lens (4) being fixed by a contact region (8) and the spring element (6) in the fastened state, or the starting part (3) having a spring element (6 ') and the locking element (5) having a contact region (8'), the at least one lens (4) being fixed by the contact region (8 ') and the spring element (6') in the fastened state.

Description

Technical Field

[0001] The invention relates to a lens system, which is arranged to cooperate with a light source (or is assigned to the light source), wherein in the assembled state in which the lens system cooperates with the light source (or is assigned to the light source), in particular in the assembled state in which the lens system cooperates optically with the light source, the lens system and the light source form a component of a vehicle light or a vehicle light, in particular a motor vehicle light, wherein in the assembled state the lens system is arranged to optically influence the light that can be generated by the light source and can be radiated in a main radiation direction, wherein the lens system comprises:

[0002] A holding device, which in an assembled state is arranged behind the light source in a main radiation direction, and in which at least one lens is accommodated, preferably two, three or more lenses are accommodated in the holding device, wherein the at least one lens is designed to cooperate with the light source to form a light function, wherein the holding device has a holding part, which is arranged to hold the at least one lens, so that:

[0003] In the assembled state, the light incident surface of at least one lens faces the light source, and the light emitting surface of at least one lens faces away from the light source, so that light from the light source can enter the at least one lens through the light incident surface, pass through the at least one lens, and leave the at least one lens through the light emitting surface.

[0004] the optical axis of at least one lens is oriented parallel to the main radiation direction, preferably coaxially therewith, and

[0005] at least one lens is fixed in a plane oriented orthogonally to an optical axis of the at least one lens,

[0006] The holding device has a starting portion facing the light source and an end portion facing away from the light source, wherein the holding portion extends from the starting portion to the end portion along the longitudinal axis of the holding device.

[0007] The invention also relates to a motor vehicle headlight comprising a lens system.

[0008] The invention also relates to a method of assembling a lens system for a motor vehicle headlight. Background Art

[0009] Such lens systems for motor vehicle headlights are known in the prior art. Due to the use of different materials for the lenses, the optional spacing elements between the lenses (such as spacing plates) and the holding device (such as a holding cylinder, for example, for the lenses) in which the lenses and the spacing elements are accommodated, when the temperature rises (due to the light source), the lenses in the holding device may become loose and the optical quality of the light function generated by the lenses may change. In a known solution to this problem, so-called threaded rings are used to fasten the lenses in the holding device. However, this solution is complex and expensive to manufacture. In addition, the assembly process is prone to errors and difficult to automate.

[0010] The object of the present invention is to mitigate or eliminate the disadvantages of the prior art. Therefore, the object of the present invention is in particular to create a lens system in which one or more lenses are reliably and securely fastened at elevated temperatures and the assembly process of which is simple and fully automated.

[0011] This object is achieved by a lens system having the features of claim 1 and a method having the features of claim 14. Preferred embodiments are described in the dependent claims. Summary of the invention

[0012] According to the invention, the holding portion has a contact area which is arranged to prevent at least one lens from moving beyond the start of the holding device against the main radiation direction, in particular to prevent at least one lens from moving beyond the start of the holding device in a coaxial and linear manner against the main radiation direction.

[0013] wherein the lens system has a locking element which can be fastened to an end portion of the holding device, wherein the locking element has an engagement element and the end portion has a mating engagement element designed to be complementary to the engagement element, wherein the locking element is fastened to the end portion by engagement of the engagement element with the mating engagement element, preferably, the locking element is fastened to the end portion in a detachable manner by engagement of the engagement element with the mating engagement element, wherein the locking element is configured to block at least one lens from moving beyond the end portion of the holding device in the main radiation direction in a state where the locking element is fastened to the end portion,

[0014] The locking element has a spring element, which is configured to act on at least one lens and apply a spring force to the at least one lens when the locking element is fastened to the end portion, in particular, the spring element acts on a part of the light exit surface of the at least one lens, wherein the spring element is designed to act in a direction opposite to the main radiation direction, so that the side of the at least one lens facing away from the spring element is pressed against the contact area by the spring force and fixed in place in the main radiation direction.

[0015] Alternatively, it is provided according to the invention that the lens system has a locking element which can be fastened to an end portion of the holding device, wherein the locking element has an engagement element and the end portion has a mating engagement element designed to be complementary to the engagement element, wherein the locking element is fastened to the end portion by engagement of the engagement element with the mating engagement element, preferably, the locking element is fastened to the end portion in a detachable manner by engagement of the engagement element with the mating engagement element, wherein the locking element has a contact area which is arranged to block the at least one lens from moving beyond the end portion of the holding device in a main radiation direction, in particular to block the at least one lens from moving linearly in a coaxial manner along the main radiation direction beyond the end portion of the holding device,

[0016] The starting part of the holding device has a spring element, which is configured to act on at least one lens and apply a spring force to the at least one lens when the locking element is fastened to the end part. In particular, the spring element acts on a part of the light entrance surface of the at least one lens. The spring element is designed so that the spring force acts in the main radiation direction, thereby pressing the side of the at least one lens facing away from the spring element against the contact area and fixing the at least one lens in place in the main radiation direction.

[0017] This results in the following advantages: the at least one lens is held securely and reliably between the contact region and the spring element, wherein in addition to being securely held, thermal expansion of the lens due to the light source being switched on and thus dissipating heat is also compensated by the spring force of the spring element. Due to the spring force, the lens cannot come loose in the holding device, even if the lens is subject to thermal expansion. Thus, light functions, such as dynamic floor projections, can be reliably generated by the lens system. Preferably, the lens system is part of a projection system (e.g. imaging optics) of a lighting device of a motor vehicle headlight.

[0018] It can be provided that the spring element has at least two, three, four or more spring arms which extend radially towards the longitudinal axis of the holding device in the tightened state, wherein the spring arms are arranged on the locking element or on the starting part so that the action surfaces of the spring arms acting on the at least one lens are evenly or equidistantly distributed on the at least one lens on the circumferential side along the at least one lens periphery. Preferably, the spring arms each have a longitudinal extension extending in a plane oriented orthogonally to the optical axis of the at least one lens. The spring arms are preferably designed to be of the same type, construction or shape. In particular, the spring arms are arranged on the starting part of the holding device or on the locking element so that the spring arms are located in the same plane.

[0019] It can be provided that the holding device is designed as a hollow body having a longitudinal extension which extends parallel to the longitudinal axis and parallel to the light emission direction, wherein the holding portion is formed on the inside of the lateral surfaces which delimit the hollow body.

[0020] It can be provided that the retaining device, preferably also the locking element, is designed as a cylindrical hollow body, which is delimited by a cylindrical body side circumference, wherein the retaining portion is formed on the inner surface of the cylindrical body side circumference so that at least one lens is surrounded by the cylindrical hollow body in the circumferential direction.

[0021] It can be provided that the spring element has at least two, three, four or more spring arms, each of the spring arms having an arcuate longitudinal extension, wherein the at least two spring arms are designed so that the longitudinal extension of the at least two spring arms follows a portion of a virtual circle whose radius is equal to or smaller than the circumference of the side circumference of the cylinder.

[0022] It can be provided that the lens system has at least two, three or more lenses, which are arranged coaxially one behind the other on the holding part along the main radiation direction, wherein a spacing element is preferably arranged between at least two adjacent lenses, preferably between all successive lenses, which keeps two adjacent lenses at a predetermined distance from each other along the main radiation direction. Preferably, at least one spacing element, preferably all spacing elements arranged between the lenses, are designed as a diaphragm, which is particularly designed to block scattered light occurring at the edge of the lens so that the scattered light is absorbed in the holding device.

[0023] It can be stipulated that the proximal lens is closest to the light source and the distal lens is farthest from the light source, wherein the spring element acts on the light emitting surface of the distal lens and the light incident surface of the proximal lens contacts the contact area of ​​the retaining part, or the spring element acts on the light incident surface of the proximal lens, and the light emitting surface of the distal lens contacts the contact area of ​​the locking element.

[0024] It can be provided that at least two, three or more lenses each have the same or different lens shapes, such as biconvex, biconcave, concave-convex or convex-concave lens shapes. Other lens shapes can include spherical, aspherical, planar lens surfaces or free-form surfaces.

[0025] It can be provided that the holding device with the at least one lens is designed as an objective tube.

[0026] It can be provided that the engagement element and the counter engagement element form an adhesive connection, a snap connection, a bayonet lock or a clip connection.

[0027] It can be provided that the holding part, preferably the holding device, is designed to be opaque to the light from the light source.

[0028] It can be provided that the contact region of the holding device and / or the locking element is designed as a contact surface, for example as a projection, which extends from an inner surface of the locking element or the holding device facing the at least one lens in the direction of the longitudinal axis.

[0029] A vehicle lamp can be provided, which is particularly a motor vehicle lamp, comprising a lens system and a light source, which cooperates with the lens system and forms an assembled state with the lens system, wherein the vehicle lamp is particularly a motor vehicle headlight, a ground projection device or a digital light processing light module.

[0030] According to a further aspect of the present invention, there is provided a method for assembling a lens system for a vehicle lamp, in particular for a motor vehicle headlight, the method comprising the following steps:

[0031] - providing a light source for generating light and radiating the light in a main radiation direction,

[0032] - providing a holding device which is arranged behind the light source in the main radiation direction,

[0033] - receiving at least one lens, preferably two, three or more lenses, in a holding device, wherein the at least one lens in the received state is arranged to cooperate with the light source to form a light function, wherein the holding device has a holding part, which is arranged to hold the at least one lens, so that:

[0034] The light entrance surface of at least one lens faces the light source, and the light exit surface of at least one lens faces away from the light source, so that light from the light source can enter the at least one lens through the light entrance surface, pass through the at least one lens, and leave the at least one lens through the light exit surface.

[0035] the optical axis of at least one lens is oriented parallel to the main radiation direction, preferably coaxially therewith, and

[0036] at least one lens is fixed in a plane oriented orthogonally to an optical axis of the at least one lens,

[0037] The holding device has a starting portion facing the light source and an end portion facing away from the light source, wherein the holding portion extends from the starting portion to the end portion along the longitudinal axis of the holding device.

[0038] The method comprises the following steps according to the invention:

[0039] - providing a locking element which can be fastened to an end portion of the holding device, wherein the locking element has an engagement element and the end portion has a mating engagement element designed to be complementary to the engagement element, wherein the locking element is fastened to the end portion, preferably in a detachable manner, by engagement of the engagement element with the mating engagement element, wherein the locking element is arranged to block a movement of the at least one lens in the main radiation direction beyond the end portion in the fastened state,

[0040] The holding portion has a contact area, which is configured to prevent at least one lens from moving beyond the starting portion against the main radiation direction, in particular to prevent at least one lens from moving beyond the starting portion in a coaxial manner against the main radiation direction.

[0041] - fastening a locking element to the end portion, wherein the locking element has a spring element, which is arranged to act on the at least one lens in the fastened state of the locking element and to apply a spring force to the at least one lens, in particular, the spring element acts on a part of a light exit surface of the at least one lens, wherein the spring element is designed so that the spring force acts in a direction opposite to the main radiation direction, and the side of the at least one lens facing away from the spring element is pressed against the contact area by the spring force and the at least one lens is fixed in place in the main radiation direction.

[0042] Alternatively, the method comprises the following steps according to the invention:

[0043] - providing a locking element which can be fastened to an end portion of the holding device, the locking element having an engagement element and the end portion having a mating engagement element designed to be complementary to the engagement element, wherein the locking element is fastened to the end portion, preferably in a detachable manner, by engagement of the engagement element with the mating engagement element,

[0044] wherein the locking element has a contact area which is arranged to block the at least one lens from moving beyond the end portion in the main radiation direction, in particular to block the at least one lens from moving linearly in a coaxial manner beyond the end portion in the main radiation direction,

[0045] - fastening the locking element to the end part, wherein the starting part has a spring element, which is arranged to act on the at least one lens and exert a spring force on the at least one lens in a state in which the locking element is fastened to the end part, in particular, the spring element acts on a part of the light entrance surface of the at least one lens, wherein the spring element is designed so that the spring force acts in the main radiation direction, so that the side of the at least one lens facing away from the spring element is pressed against the contact area by the spring force and the at least one lens is fixed in place in the main radiation direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The invention is explained in more detail below with reference to the accompanying exemplary drawings.

[0047] in:

[0048] Figure 1a shows a cross-sectional view of a lens system according to a first embodiment,

[0049] Figure 1b Shown according to Figure 1a The locking element of the lens system,

[0050] Figure 2a shows a cross-sectional view of a lens system according to a second embodiment,

[0051] Figure 2b Shown according to Figure 2a The locking element of the lens system,

[0052] Figure 3 shows a perspective view of the holding device,

[0053] Figure 4 shows a cross-sectional view of a holding device with three lenses, and

[0054] Figures 5a to 5d These are different fastening variants of the locking element on the retaining device. DETAILED DESCRIPTION

[0055] Figure 1aA first embodiment of a lens system 1 for a vehicle light, in particular a motor vehicle light or a motor vehicle headlight, is shown. The lens system 1 is arranged to cooperate with a light source 2 and forms an assembled state with the light source 2. In the assembled state, the lens system 1 cooperates with the light source 2, in particular optically. In the assembled state, the lens system 1 and the light source 2 form a component or a vehicle light of a vehicle light, in particular a motor vehicle light. Furthermore, in the assembled state, the lens system 1 is arranged to optically influence light that can be generated by the light source 2 (or is generated by the light source 2) and can be radiated in a main radiation direction x (or radiates in a main radiation direction x). In particular, in the assembled state, the light of the light source 2 can strike one or more lenses of the lens system 1 and be optically influenced by one or more lenses of the lens system 1. In the manufactured state, no light source 2 is assigned to the lens system 1 or in the manufactured state no light source 2 cooperates with the lens system 1. During the transition from the manufactured state to the assembled state, the light source 2 is assigned to the lens system 1 so that the lens system 1 can cooperate with the light source 2 (or with the light from the light source 2).

[0056] In assembled state (such as Figure 1a and Figure 2a ), the light source 2 is arranged to generate and radiate light in a main radiation direction x. In the assembled state, the holding device 3 of the lens system 1 is arranged behind the light source 2 in the main radiation direction x, and in the example shown, three lenses 4 are accommodated in the holding device 3. Any number of lenses can be accommodated in the holding device 3, the number of lenses being essentially determined by the desired light function to be generated by the lens system 1. The lenses 4 are arranged to form a specific light function in a manner that cooperates with the light source 2.

[0057] The holding device 3 includes a holding part 3b, which is configured to hold the lens 4 so that: the light incident surface 4a of the lens 4 faces the light source 2, and the light exit surface 4b of the lens 4 is away from the light source 2, so that the light from the light source 2 enters the corresponding lens through the light incident surface 4a, passes through the lens 4, and leaves the lens 4 through the light exit surface 4b.

[0058] The holding portion 3 b is furthermore provided for holding the lens 4 in such a way that the optical axis A of the lens 4 is oriented parallel to the main radiation direction x, preferably coaxially to the main radiation direction x.

[0059] The holding portion 3 b is furthermore provided for holding the lens 4 in such a way that the lens 4 is fixed in parallel planes which are each oriented orthogonally to the optical axis A of the lens 4 .

[0060] The holding device 3 has a starting portion 3a facing the light source 2 and an end portion 3c facing away from the light source 2. In addition, the holding portion 3b extends from the starting portion 3a to the end portion 3c along the longitudinal axis L of the holding device 3. The holding portion 3b (or the starting portion 3a) has a contact area 8, which is configured to prevent the lens 4 from moving beyond the starting portion 3a of the holding device 3 against the main radiation direction x, in particular, to prevent the lens 4 from moving linearly beyond the starting portion 3a of the holding device 3 in a coaxial manner against the main radiation direction x.

[0061] The three lenses 4 include a proximal lens 4 ( Figure 1a and Figure 1b The left lens in the figure) and the far lens 4 ( Figure 1a and Figure 1b The proximal lens 4 is closest to the light source 2, and the distal lens is farthest from the light source 2. Another lens 4 ( Figure 1a and Figure 1b intermediate lens in the image).

[0062] according to Figure 1a and Figure 1b In an embodiment of the present invention, the lens system 1 has a locking element 5, which can be fastened to the end portion 3c of the holding device 3. The locking element 5 has an engagement element 6a, and the end portion 3c has a mating engagement element 6b ( Figure 3 , Figure 4 ). By engaging the engagement element 6a with the mating engagement element 6b, the locking element 5 is fastened to the end portion 3c, preferably in a detachable manner.

[0063] The locking element 5 is arranged for blocking a movement of the at least one lens 4 in the main radiation direction x beyond the end portion 3 c of the holding device 3 when the locking element 5 is fastened to the end portion 3 c .

[0064] Furthermore, the locking element 5 has a spring element 6 (see Figure 1b ), the spring element 6 is arranged to be used in a state where the locking element 5 is fastened to the end portion 3c (see Figure 1a ) and applies a spring force F to the telephoto lens 4, in particular, the spring element 6 acts on a portion of the light exit surface 4b of the telephoto lens 4. The spring element 6 is designed so that: the spring force F acts in a direction opposite to the main radiation direction x, so that the spring force F presses the side of the telephoto lens 4 facing away from the spring element 6 against the contact area 8 and fixes it in place in the main radiation direction x.

[0065] In the case of a lens system having a single lens, the lens is held between a spring element 6 of the locking element 5 and a contact area 8 formed on the holding portion 3 b or the starting portion 3 a.

[0066] Figure 2a and 2b A second embodiment of the lens system 1 is shown. In this example, the locking element 5 can also be fastened to the end portion 3c of the holding device 3. The locking element 5 likewise has an engagement element 6a, and the end portion 3c has a mating engagement element 6b ( Figure 3 , Figure 4 ). By engaging the engagement element 6a with the mating engagement element 6b, the locking element 5 may be fastened to the end portion 3c, preferably in a detachable manner.

[0067] Different from Figure 1a and Figure 1b In an embodiment, the locking element 5 has a contact area 8', which is configured to prevent the distal lens 4 from moving beyond the end portion 3c of the retaining device 3 along the main radiation direction x, and in particular to prevent the distal lens 4 from moving linearly along the main radiation direction x beyond the end portion 3c of the retaining device 3 in a coaxial manner.

[0068] In this embodiment, the starting part 3a of the holding device 3 comprises a spring element 6', which is arranged to act on the proximal lens 4 and apply a spring force F' to the proximal lens 4 in a state where the locking element 5 is fastened to the end part 3c, in particular, the spring element 6' acts on a part of the light entrance surface 4a of the proximal lens 4. The spring element 6' is designed so that: the spring force F' acts in the main radiation direction x, so that the side of the proximal lens 4 facing away from the spring element 6' is pressed against the contact area 8' by the spring force F' and fixed in place in the main radiation direction x.

[0069] like Figure 3 and Figure 4 As shown in Figure 1a and Figure 2a In the embodiment of the present invention, the retaining device 3 is designed as a hollow body having a longitudinal extension extending parallel to the longitudinal axis L and parallel to the light radiation direction x. The longitudinal axis L and the light radiation direction x are also parallel to the optical axis A of the lens 4. The retaining portion 3b is formed on the inner side of the lateral surface defining the hollow body. In the embodiment shown, the retaining device 3 and the locking element 5 are both designed as a cylindrical hollow body, which is defined by the lateral circumferential surface of the cylinder. The retaining portion 3b is formed on the inner surface of the lateral circumferential surface of the retaining device 3, so that the lens 4 is surrounded by the cylindrical hollow body in the circumferential direction.

[0070] Optionally, a spacer element 9 is arranged between at least two adjacent lenses 4, preferably between all lenses 4 that are connected to each other, and the spacer element 9 enables two adjacent lenses 4 to maintain a predetermined distance from each other along the main radiation direction x.

[0071] When multiple lenses 4 are accommodated in the retaining device 3, the contact area 8 (or contact area 8') that is pressed against the proximal lens 4 (or distal lens 4) by the spring element 6 (or spring element 6') can be designed as a spacing element between the distal lens 4 (or proximal lens) and the lens subsequent to the lens.

[0072] Figure 5a to Figure 5d Different variations of the engagement element 6a and the mating engagement element 6b are shown. Figure 5a In the embodiment, the joining element 6a (not shown) and the mating joining element 6b are adhesively connected 7a. Figure 5b In the embodiment, the engaging element 6a and the mating engaging element 6b are snap-fit ​​connections 7b. Figure 5c In the embodiment, the engaging element 6a and the counter-engaging element 6b form a bayonet lock 7c. Figure 5d In the embodiment shown in FIG. 7 , the engagement element 6 a (not shown) and the mating engagement element 6 b are designed as a clamping connection 7 d.

[0073] Reference numerals list

[0074] 1 Lens system

[0075] 2 Light Source

[0076] 3. Holding device

[0077] 3a. Initial part

[0078] 3b Keeping part

[0079] 3c terminal part

[0080] 4 Lenses

[0081] 4a Light incident surface

[0082] 4b Light-emitting surface

[0083] 5 Locking element

[0084] 6 Spring element of the locking element

[0085] 6' Spring element of the retaining device

[0086] 6a Joining elements

[0087] 6b Mating engagement elements

[0088] 7a Adhesive connection

[0089] 7b Snap-on connection

[0090] 7c Bayonet lock

[0091] 7d Clamp connection

[0092] 8 Contact area of ​​the holding device

[0093] 8' Contact area of ​​locking element

[0094] 9 Spacer elements

[0095] A Optical axis of the lens

[0096] L Longitudinal axis of the holding device

[0097] The main radiation direction of the X-ray source.

Claims

1. A lens system (1), the lens system (1) being configured to cooperate with a light source (2), wherein: In an assembled state in which the lens system (1) and the light source (2) cooperate, the lens system (1) and the light source (2) form a component of a vehicle light or form a vehicle light, in particular, the lens system (1) and the light source (2) form a vehicle light, wherein in the assembled state, the lens system (1) is configured to optically influence light that can be generated by the light source (2) and can be radiated along a main radiation direction (x), wherein the lens system comprises: A holding device (3), wherein the holding device (3) is arranged behind the light source (2) along the main radiation direction (x) in the assembled state, and at least one lens (4) is accommodated in the holding device (3), preferably, two, three or more lenses are accommodated in the holding device (3), wherein at least one of the lenses (4) is configured to cooperate with the light source (2) to form a light function, wherein the holding device (3) has a holding portion (3b), and the holding portion (3b) is configured to hold at least one of the lenses (4), so that: In the assembled state, the light entrance surface (4a) of at least one of the lenses (4) faces the light source (2), and the light exit surface (4b) of at least one of the lenses (4) faces away from the light source (2), so that light from the light source (2) can enter at least one of the lenses via the light entrance surface (4a), pass through at least one of the lenses (4), and leave at least one of the lenses (4) via the light exit surface (4b). The optical axis (A) of at least one of the lenses (4) is oriented parallel to the main radiation direction (x), preferably, the optical axis (A) of at least one of the lenses (4) is oriented coaxially with the main radiation direction (x), and at least one of the lenses (4) is fixed in a plane oriented orthogonally to the optical axis (A) of at least one of the lenses (4), The holding device (3) comprises a starting portion (3a) and an end portion (3c), wherein the starting portion (3a) faces the light source (2) and the end portion (3c) faces away from the light source (2), wherein the holding portion (3b) extends from the starting portion (3a) to the end portion (3c) along the longitudinal axis (L) of the holding device (3), and the lens system (1) is characterized in that: The holding portion (3b) has a contact area (8), which is configured to prevent at least one of the lenses (4) from moving beyond the starting portion (3a) of the holding device (3) in the opposite direction of the main radiation direction (x). In particular, the contact area (8) is configured to prevent at least one of the lenses (4) from moving in a coaxial manner in the opposite direction of the main radiation direction (x) beyond the starting portion (3a) of the holding device (3). The lens system (1) comprises a locking element (5), which can be fastened to the end portion (3c) of the holding device (3), wherein the locking element (5) comprises an engagement element (6a), and the end portion (3c) comprises a mating engagement element (6b) designed to be complementary to the engagement element (6a), wherein the locking element (5) is fastened to the end portion (3c) by engagement of the engagement element (6a) with the mating engagement element (6b), preferably, the locking element (5) is fastened to the end portion (3c) in a detachable manner by engagement of the engagement element (6a) with the mating engagement element (6b), wherein the locking element (5) is configured to prevent at least one of the lenses (4) from moving beyond the end portion (3c) of the holding device (3) along the main radiation direction (x) when the locking element (5) is fastened to the end portion (3c), wherein the locking element (5) has a spring element (6), and the spring element (6) is configured to act on at least one of the lenses (4) and apply a spring force (F) to at least one of the lenses (4) when the locking element (5) is fastened to the end portion (3c); in particular, the spring element (6) is configured to act on a portion of the light exit surface (4b) of at least one of the lenses (4) when the locking element (5) is fastened to the end portion (3c); wherein the spring element (6) is designed so that the spring force (F) acts in a direction opposite to the main radiation direction (x), so that the side of the at least one lens (4) facing away from the spring element (6) is pressed against the contact area (8) by the spring force (F) and the at least one lens (4) is fixed in place in the main radiation direction (x); or The lens system (1) has a locking element (5), which can be fastened to the end portion (3c) of the holding device (3), wherein the locking element (5) has an engagement element (6a), and the end portion (3c) has a mating engagement element (6b) designed to be complementary to the engagement element (6a), wherein the locking element (5) is fastened to the end portion (3c) by the engagement of the engagement element (6a) with the mating engagement element (6b), preferably, the locking element (5) is fastened to the end portion (3c) by the engagement of the engagement element (6a) with the mating engagement element (6b). The locking element (5) is fastened to the end portion (3c) in a detachable manner by engagement of the mating engagement element (6b), wherein the locking element (5) has a contact area (8'), and the contact area (8') is configured to prevent at least one of the lenses (4) from moving in the main radiation direction (x) beyond the end portion (3c) of the retaining device (3), in particular, the contact area (8') is configured to prevent at least one of the lenses (4) from moving in a coaxial manner and linearly along the main radiation direction (x) beyond the end portion (3c) of the retaining device (3), The starting part (3a) of the holding device comprises a spring element (6'), wherein the spring element (6') is configured to act on at least one of the lenses (4) and apply a spring force (F') to at least one of the lenses (4) when the locking element (5) is fastened to the end part (3c), in particular, the spring element (6') is configured to act on a part of the light entrance surface (4a) of at least one of the lenses (4) when the locking element (5) is fastened to the end part (3c), wherein the spring element (6') is designed so that the spring force (F') acts along the main radiation direction (x), so that the side of at least one of the lenses (4) facing away from the spring element (6) is pressed against the contact area (8') by the spring force (F') and the at least one of the lenses (4) is fixed in place in the main radiation direction (x).

2. The lens system (1) according to claim 1, wherein: The spring element (6, 6') has at least two, three, four or more spring arms, which extend radially toward the longitudinal axis (L) of the holding device (3) in the tightened state, wherein the spring arms are arranged on the locking element (5) or the starting part (3a) so that the active surfaces of the spring arms acting on at least one of the lenses (4) are evenly or equidistantly distributed on the circumferential side along the lens periphery of at least one of the lenses (4).

3. The lens system (1) according to any one of the preceding claims, wherein: The retaining device (3) is designed as a hollow body having a longitudinal extension extending parallel to the longitudinal axis (L) and parallel to the main radiation direction (x), wherein the retaining portion (3b) is formed on the inner side of the lateral surface defining the hollow body.

4. The lens system (1) according to any one of the preceding claims, wherein: The retaining device (3) is designed as a cylindrical hollow body defined by a cylindrical side circumference, and preferably, the locking element (5) is designed as a cylindrical hollow body defined by a cylindrical side circumference, wherein the retaining portion (3b) is formed on the inner surface of the cylindrical side circumference, so that at least one of the lenses (4) is surrounded by the cylindrical hollow body on the circumferential side.

5. The lens system according to claim 4, wherein: The spring element (6, 6') has at least two, three, four or more spring arms, each of which has an arcuate longitudinal extension, wherein at least two of the spring arms are designed so that: the longitudinal extension of at least two of the spring arms follows a part of a virtual circle, the radius of the virtual circle is equal to or smaller than the circumference of the cylindrical side surface.

6. The lens system (1) according to claim 1, comprising at least two, three or more lenses (4), which are arranged coaxially one behind the other on a holding part (3b) along the main radiation direction (x), wherein: Preferably, a spacing element (9) is arranged between at least two adjacent lenses (4), and preferably, a spacing element (9) is arranged between all lenses (4) that are connected to each other, and the spacing element (9) enables two adjacent lenses to maintain a predetermined distance from each other along the main radiation direction (x).

7. The lens system (1) according to claim 6, wherein: The proximal lens is closest to the light source (2), and the distal lens is farthest from the light source (2), wherein the spring element (6) acts on the light emitting surface (4b) of the distal lens, and the light incident surface (4a) of the proximal lens contacts the contact area (8) of the retaining portion (3b), or the spring element (6') acts on the light incident surface (4a) of the proximal lens, and the light emitting surface (4b) of the distal lens contacts the contact area (8') of the locking element (5).

8. The lens system (1) according to claim 6 or 7, wherein: At least two, three or more of the lenses (4) each have the same or different lens shapes, for example, the lens shapes include biconvex, biconcave, concave-convex or convex-concave lens shapes.

9. The lens system (1) according to any one of the preceding claims, wherein: The holding device (3) and at least one of the lenses (4) are designed as a lens barrel.

10. The lens system (1) according to any of the preceding claims, wherein The engagement element (6a) and the mating engagement element (6b) form an adhesive connection (7a), a snap connection (7b), a bayonet lock (7c) or a clamping connection (7d).

11. The lens system (1) according to any of the preceding claims, wherein: The holding portion (3b) is designed to be opaque to the light from the light source (2). Preferably, the holding device (3) is designed to be opaque to the light from the light source (2).

12. The lens system (1) according to any one of the preceding claims, wherein: The contact area (8) of the retaining device (3) and / or the contact area (8') of the locking element (5) is designed as a contact surface, which is, for example, a protrusion, extending from an inner surface of the locking element (5) or the retaining device (3) facing at least one of the lenses (4) in the direction of the longitudinal axis (L).

13. A vehicle lamp, in particular, the vehicle lamp is a vehicle lamp, the vehicle lamp comprising a light source (2) and a lens system (1) according to any one of claims 1 to 12, the light source (2) cooperating with the lens system (1) and forming an assembled state with the lens system (1), wherein: In particular, the vehicle lamp is a motor vehicle headlight, a ground projection device or a digital light processing light module.

14. A method for assembling a lens system (1) for a vehicle lamp, the method comprising the following steps: - providing a light source (2) for generating light and radiating the light in a main radiation direction (x), - providing a holding device (3), which is arranged behind the light source in the main radiation direction (x), - at least one lens (4) is received in the holding device, preferably two, three or more lenses are received in the holding device, wherein at least one of the lenses (4) is configured to cooperate with the light source (2) to form a light function in the received state, wherein the holding device (3) has a holding portion (3b), and the holding portion (3b) is configured to hold at least one of the lenses (4), so that: The light entrance surface (4a) of at least one of the lenses (4) faces the light source (2), and the light exit surface (4b) of at least one of the lenses (4) faces away from the light source (2), so that light from the light source (2) can enter at least one of the lenses via the light entrance surface (4a), pass through at least one of the lenses (4), and leave at least one of the lenses (4) via the light exit surface (4b). The optical axis (A) of at least one of the lenses (4) is oriented parallel to the main radiation direction (x), preferably, the optical axis (A) of at least one of the lenses (4) is oriented coaxially with the main radiation direction (x), and at least one of the lenses (4) is fixed in a plane oriented orthogonally to the optical axis (A) of at least one of the lenses (4), The holding device (3) comprises a starting portion (3a) and an end portion (3c), wherein the starting portion (3a) faces the light source (2) and the end portion (3c) faces away from the light source (2), wherein the holding portion (3b) extends from the starting portion (3a) to the end portion (3c) along the longitudinal axis (L) of the holding device (3), and the method is characterized by the following steps: - providing a locking element (5), which can be fastened to the end portion (3c) of the holding device (3), wherein the locking element (5) has an engagement element (6a), and the end portion (3c) has a mating engagement element (6b), and the mating engagement element (6b) is designed to be complementary to the engagement element (6a), wherein the locking element (5) is fastened to the end portion (3c) by engagement of the engagement element (6a) with the mating engagement element (6b), preferably, the locking element (5) is fastened to the end portion (3c) in a detachable manner by engagement of the engagement element (6a) with the mating engagement element (6b), wherein the locking element (5) is arranged to block at least one of the lenses (4) from moving beyond the end portion (3c) along the main radiation direction (x) in the fastened state, The holding portion (3b) has a contact area (8), and the contact area (8) is configured to prevent at least one of the lenses (4) from moving beyond the initial portion (3a) against the main radiation direction (x). In particular, the contact area (8) is configured to prevent at least one of the lenses (4) from moving beyond the initial portion (3a) in a coaxial manner against the main radiation direction (x). - fastening the locking element (5) to the end portion (3c), wherein the locking element (5) has a spring element (6), which is configured to: act on at least one of the lenses (4) in the fastened state of the locking element (5) and apply a spring force (F) to at least one of the lenses (4), in particular, the spring element (6) is configured to act on a portion of the light exit surface (4b) of at least one of the lenses (4) in the fastened state of the locking element (5), wherein the spring element (6) is designed so that the spring force (F) acts in a direction opposite to the main radiation direction (x), and by means of the spring force (F), a side of the at least one lens (4) facing away from the spring element (6) is pressed against the contact area (8) and the at least one lens (4) is fixed in place in the main radiation direction (x), or - providing a locking element (5) which can be fixed to the end portion (3c) of the retaining device (3), wherein the locking element (5) has an engagement element (6) and the end portion (3c) has a mating engagement element (6b), the mating engagement element (6b) being designed to be complementary to the engagement element (6a), wherein the locking element (5) is fastened to the end portion (3c) by engagement of the engagement element (6a) with the mating engagement element (6b), preferably, the locking element (5) is fastened to the end portion (3c) in a detachable manner by engagement of the engagement element (6a) with the mating engagement element (6b), The locking element (5) has a contact area (8'), and the contact area (8') is configured to prevent at least one of the lenses (4) from moving beyond the end portion (3c) along the main radiation direction (x). In particular, the contact area (8') is configured to prevent at least one of the lenses (4) from moving beyond the end portion (3c) in a coaxial manner along the main radiation direction (x). - fastening the locking element (5) to the end portion (3c), wherein the starting portion (3a) has a spring element (6'), which is configured to act on at least one of the lenses (4) and apply a spring force (F') to at least one of the lenses (4) when the locking element (5) is fastened to the end portion (3c), in particular, the spring element (6') is configured to act on a portion of a light entrance surface (4a) of at least one of the lenses (4) when the locking element (5) is fastened to the end portion (3c), wherein the spring element (6') is designed so that the spring force (F') acts in the main radiation direction (x), so that the side of the at least one lens (4) facing away from the spring element (6) is pressed against the contact area (8') by the spring force (F') and fixes the at least one lens (4) in place in the main radiation direction (x).

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