Lens unit

Abstract

The lens unit includes: a plurality of lenses arranged in an axial direction along an optical axis, the plurality of lenses including: a first lens group including a plane-receiving lens having a pressed plane perpendicular to the axial direction; and a second lens group including an inclination receiving lens having a pressed inclined surface inclined with respect to the axial direction; a lens barrel in which the plurality of lenses are accommodated; an elastic member located between the first lens group and the second lens group, the elastic member configured to support at least one of the plurality of lenses in the lens barrel; and a pressing member configured to press the plurality of lenses in the lens barrel.

Description

Technical Field

[0001] The present disclosure relates to a lens unit. Background Art

[0002] A lens unit is known, which includes a plurality of lenses, a lens barrel accommodating the plurality of lenses, and a pressing member for pressing the plurality of lenses accommodated in the lens barrel. This lens unit is used in a camera mounted on a moving body such as a car or a drone, or in a surveillance camera set in a building.

[0003] For example, Patent Document 1 discloses a structure of a lens unit including a lens barrel accommodating a plurality of lenses, the plurality of lenses including a first lens arranged on the object side and a second lens adjacent to the first lens on the image side. In addition, in the lens unit, an elastic member in contact with the first lens and the second lens is provided between the first lens and the second lens.

[0004] However, in the configuration of the lens unit disclosed in Patent Document 1, there are cases where the performance of the lens unit varies due to changes in the shapes or positions of the plurality of lenses.

[0005] Citation list

[0006] Patent Literature

[0007] [PTL1] Japanese Unexamined Patent Publication No. 2021-140043 Summary of the invention

[0008] Technical issues

[0009] An object of the present invention is to provide a lens unit capable of suppressing changes in the shapes and positions of a plurality of lenses.

[0010] Solutions to the problem

[0011] A lens unit, comprising:

[0012] A plurality of lenses are arranged in an axial direction along an optical axis, the plurality of lenses comprising: a first lens group comprising a plane receiving lens having a pressed plane perpendicular to the axial direction; and a second lens group comprising an inclined receiving lens having an inclined surface to be pressed inclined relative to the axial direction,

[0013] a lens barrel, in which the plurality of lenses are accommodated;

[0014] an elastic member located between the first lens group and the second lens group, the elastic member being configured to support at least one of the plurality of lenses in the lens barrel; and

[0015] The pressing member is configured to press the plurality of lenses in the lens barrel.

[0016] In addition, an embodiment of the present disclosure provides a lens unit, comprising: a plurality of lenses arranged axially along an optical axis; a lens barrel, wherein the plurality of lenses are accommodated inside the lens barrel; an elastic member configured to support at least one of the plurality of lenses in the lens barrel; and a pressing member configured to press the plurality of lenses in the lens barrel.

[0017] Here, the following expression (1) is satisfied:

[0018] (1)

[0019] Here: K is the elastic coefficient of the elastic member, F is the elastic force of the multiple lenses pressed by the elasticity of the elastic member, t is the ambient temperature range in which the lens unit is allowed to be used, n is the number of the multiple lenses pressed by the elastic member with the elastic force of the elastic member, αi is the linear expansion coefficient of each of the multiple lenses in the lens barrel pressed by the elastic member, Li is the axial length of each of the multiple lenses, α0 is the linear expansion coefficient of the lens barrel, and L0 is the axial length of the lens barrel.

[0020] Effects of the Invention

[0021] According to an embodiment of the present disclosure, there is provided a lens unit which reduces variations in shapes or positions of a plurality of lenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are intended to describe embodiments of the present disclosure and should not be interpreted as limiting the scope thereof. Unless explicitly noted, the accompanying drawings should not be considered to be drawn to scale. Moreover, throughout the several views, the same or similar reference numerals represent the same or similar components.

[0023] [ Figure 1 ]

[0024] Figure 1 1 is a cross-sectional view showing the structure of the lens unit in the longitudinal direction according to the first embodiment.

[0025] [ Figure 2A ]

[0026] Figure 2A This is a diagram of a tilt-bearing lens without positional deviation.

[0027] [ Figure 2B ]

[0028] Figure 2B It is a diagram of a tilt-bearing lens with positional displacement.

[0029] [ Figure 3A ]

[0030] Figure 3A It is a diagram showing a method of supporting the sixth lens without lens deformation according to a modification of the first embodiment.

[0031] [ Figure 3B ]

[0032] Figure 3B It is a diagram showing a method of supporting the sixth lens having lens deformation according to a modification of the first embodiment.

[0033] [ Figure 4 ]

[0034] Figure 4 Yes means Figure 1 A graph showing evaluation results of the movement amount of each lens of the rear lens group of the lens unit in each temperature cycle.

[0035] [ Figure 5 ]

[0036] Figure 5 yes Figure 1 An enlarged view of the fourth lens and the fifth lens in the lens unit.

[0037] [ Figure 6 ]

[0038] Figure 6 1 is a cross-sectional view showing the structure of a lens unit in the longitudinal direction according to the second embodiment.

[0039] [ Figure 7 ]

[0040] Figure 7 It is a cross-sectional view showing the structure of the lens unit in the longitudinal direction of the first example of the third embodiment.

[0041] [ Figure 8 ]

[0042] Figure 8 It is a cross-sectional view showing the structure in the longitudinal direction of the lens unit of the second example of the third embodiment. DETAILED DESCRIPTION

[0043] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0044] In describing the embodiments shown in the drawings, specific terms are used for clarity. However, the disclosure of this specification is not intended to be limited to the specific terms selected, and it should be understood that each specific component includes all technical equivalents having similar functions, operating in a similar manner and achieving similar results.

[0045] Hereinafter, the lens unit of an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The following embodiment is an example of a lens unit for concretizing the technical idea of ​​the present invention and is not limited thereto. Unless otherwise specified, the shapes of the components described below, their relative arrangements, and the values ​​of the parameters are not intended to limit the scope of the present invention, but are intended to illustrate the scope of the present invention. For the sake of clarity, the relative positions or sizes of the components shown in the accompanying drawings may be exaggerated. In the following description, common or equivalent elements are marked with the same or similar reference numerals, and repeated descriptions are appropriately simplified or omitted.

[0046] First embodiment

[0047] Examples of lens units

[0048] Figure 1 1 is a cross-sectional view showing the structure of the lens unit in the longitudinal direction of the first embodiment. The lens unit 100 includes a front lens group 10, a rear lens group 20, a lens barrel 1, and a front lens pressing member 2. In addition, the lens unit 100 includes a front lens light shielding member 3, a front lens elastic member 4, a first front lens spacing member 5, a second front lens spacing member 6, an elastic member 7, an intervening member 8, and a pressing member 9.

[0049] The front lens group 10 includes a first lens 11, a second lens 12, and a third lens 13. The rear lens group 20 includes a fourth lens 21, a fifth lens 22, and a sixth lens 23.

[0050] The first lens 11, the front lens light shielding member 3, the front lens elastic member 4, the first front lens spacing member 5, the second lens 12, the second front lens spacing member 6, and the third lens 13 are arranged in this order from the positive Z direction to the negative Z direction along the Z axis and accommodated in the lens barrel 1. The fourth lens 21, the fifth lens 22, the elastic member 7, the intervening member 8, and the sixth lens 23 are arranged in this order from the positive Z direction to the negative Z direction and accommodated in the lens barrel 1.

[0051] The positive Z direction is the direction pointed by the arrow indicating the Z axis in the figure, and corresponds to the direction in which the subject of the lens unit 100 is located. The negative Z direction indicates the direction opposite to the positive Z direction, and corresponds to the direction in which the image of the subject is located.

[0052] The front lens pressing member 2 has a threaded portion inside. The lens barrel 1 has a threaded portion at a portion outside in the +Z direction. By screwing the threaded portion of the front lens pressing member 2 with the threaded portion of the lens barrel 1, the first lens 11, the front lens light shielding member 3, the front lens elastic member 4, the first front lens spacing member 5, the second lens 12, the second front lens spacing member 6, and the third lens 13 are pressed. In the lens unit 100, the above-mentioned components are fixed by pressing the front lens pressing member 2.

[0053] The pressing member 9 has a threaded portion on its exterior. A portion of the interior of the lens barrel 1 in the -Z direction has a threaded portion. By combining the threaded portion of the pressing member 9 with the threaded portion of the lens barrel 1, the fourth lens 21, the fifth lens 22, the elastic member 7, the intervening member 8, and the sixth lens 23 are pressed. In the lens unit 100, the above-mentioned components are fixed by pressing the pressing member 9.

[0054] However, fixing of each member to the lens barrel 1 is not limited to coupling using a threaded portion in the front lens pressing member 2 or the pressing member 9 , and may be performed by heat caulking or bonding.

[0055] The fourth lens 21, the fifth lens 22, and the sixth lens 23 in the rear lens group 20 correspond to a plurality of lenses arranged along the optical axis A. The elastic member 7 supports the sixth lens 23 accommodated in the lens barrel 1. Here, the lens unit 100 may include a plurality of elastic members, and the plurality of elastic members may support the plurality of lenses accommodated in the lens barrel 1.

[0056] In the fourth lens 21, the plane portion 21a is pressed by the pressing member 9 via the sixth lens 23, the intervening member 8, the elastic member 7 and the fifth lens 22. In the fifth lens 22, the plane portion 22a is pressed by the pressing member 9 via the sixth lens 23, the intervening member 8, the elastic member 7 and the fifth lens 22. The plane portion 21a and the plane portion 22a are substantially perpendicular to the optical axis A. A lens having a surface or a portion of a surface perpendicular to the optical axis and being pressed is called a plane bearing lens. Therefore, each of the fourth lens 21 and the fifth lens 22 is a plane bearing lens in which a surface substantially perpendicular to the optical axis A is pressed.

[0057] The sixth lens 23 is a biconvex lens having a first spherical surface 231 and a second spherical surface 232. In the sixth lens 23, the first spherical surface 231 is pressed by the pressing member 9. The first spherical surface 231 is inclined relative to the optical axis A. A lens having a surface or a part of a surface inclined relative to the optical axis and being pressed is called an inclined receiving lens. Therefore, the sixth lens is a inclined receiving lens.

[0058] In some embodiments, in the lens unit, the inclined surface of the tilt receiving lens is a spherical surface.

[0059] The intervening member 8 is arranged to contact the elastic member 7 on a plane substantially perpendicular to the optical axis A while supporting the sixth lens 23. The sixth lens 23 is a supported lens supported by the elastic member 7 among the plurality of lenses. The intervening member 8 is assembled into the lens barrel 1, and serves as an adjusting member that adjusts the length of the elastic member 7 in the direction along the optical axis A.

[0060] In some embodiments, the lens unit further comprises: an intervening member having a surface perpendicular to the axial direction, the surface contacting the elastic member. The intervening member supports the tilted receiving lens, the elastic member supports the tilted receiving lens via the intervening member, and the tilted receiving lens has an inclined surface facing the plane receiving lens of the first lens group and inclined relative to the axial direction.

[0061] The intervening member 8 presses a surface substantially perpendicular to the optical axis A. The elastic member 7 supports the sixth lens 23 via the intervening member 8. The second spherical surface 232 of the sixth lens 23 facing the elastic member 7 is inclined with respect to the optical axis A.

[0062] In the present embodiment, while the pressing member 9 presses the elastic member 7 , the length of the elastic member 7 along the direction of the optical axis A is substantially constant.

[0063] The fourth lens 21, the fifth lens 22, and the sixth lens 23 include a plane receiving lens and a tilt receiving lens. Among these lenses, the fourth lens 21 and the fifth lens 22 constitute a first lens group 30 including a plane receiving lens. The sixth lens constitutes a second lens group 40 including a tilt receiving lens. The first lens group 30 may include a plane receiving lens other than the fourth lens 21 and the fifth lens 22. The second lens group 40 may include a tilt receiving lens other than the sixth lens 23.

[0064] In some embodiments, the lens unit comprises:

[0065] A plurality of lenses are arranged in an axial direction along an optical axis, the plurality of lenses comprising: a first lens group comprising a plane receiving lens having a pressed plane perpendicular to the axial direction; and a second lens group comprising an inclined receiving lens having an inclined surface to be pressed inclined relative to the axial direction;

[0066] a lens barrel, in which the plurality of lenses are accommodated;

[0067] an elastic member located between the first lens group and the second lens group, the elastic member being configured to support at least one of the plurality of lenses in the lens barrel; and

[0068] The pressing member is configured to press the plurality of lenses in the lens barrel.

[0069] The elastic member 7 is disposed between the first lens group 30 and the second lens group 40 .

[0070] Each lens in the front lens group 10 and the rear lens group 20 includes a glass material or a resin material. The front lens pressing member 2, the front lens light shielding member 3, the first front lens spacing member 5, the second front lens spacing member 6, the intervening member 8 and the pressing member 9 include a metal material, a resin material or a combination thereof. The front lens elastic member 4 and the elastic member 7 include a leaf spring, a coil spring, a rubber material or an adhesive including a metal material or a resin material.

[0071] Lens unit actions and effects

[0072] Each lens in the front lens group 10 and the rear lens group 20 is positioned and fixed relative to the lens barrel 1 or a member supported by the lens barrel 1. As a method for positioning and fixing the lens, press-fitting, gap fitting, bonding, etc. can be appropriately selected according to the application.

[0073] When a load is applied to the lens during pressing, the lens may be broken or rubbed by foreign matter, and the performance may be reduced. In addition, in applications such as vehicle-mounted applications, since the temperature variation range of the use environment of the lens unit 100 is large, there is a possibility that the load caused by expansion and contraction is applied, and various parts of the lens unit 100 may be damaged.

[0074] On the other hand, during bonding, the lens may become cloudy due to gas generated from the adhesive, or the adhesive may be peeled off due to expansion and contraction of the adhesive, lens, and lens barrel, thereby damaging various parts of the lens unit 100 .

[0075] As described above, when the lens unit 100 is used in an application such as vehicle-mounted application where the temperature variation range of the use environment is large, it is preferable to use a clearance fit as a lens positioning method and a lens fixing method. However, in the clearance fit, since there is a gap between the lens and the lens barrel 1 or the elastic member 7 supporting the lens in the radial direction, the lens may be displaced and decentered in the radial direction when expanding or contracting.

[0076] In addition, a spherical lens such as the sixth lens 23 is a low-cost lens because the shape of a spherical lens is simpler than that of an aspherical lens. However, when a surface inclined relative to the optical axis A of the first spherical surface 231 is pressed, the spherical lens is deformed, the pressed state changes, and the position is shifted. Figure 2A This is a diagram of a tilt-bearing lens without positional deviation. Figure 2B It is a diagram of a tilt-bearing lens with positional displacement.

[0077] exist Figure 2A, the optical axis 23c of the sixth lens 23 is substantially consistent with the optical axis A of the lens unit 100. The pressing force F0 from the pressing member 9 to the sixth lens 23 is substantially symmetrical with respect to the optical axis 23c of the sixth lens 23. The pressing force applied to the fifth lens 22 and the fourth lens 21 via the sixth lens 23 based on the pressing force F0 is substantially symmetrical with respect to the optical axis A.

[0078] On the other hand, Figure 2B As shown in FIG. 1 , the sixth lens 23 is sometimes tilted relative to the lens barrel. Figure 2B , the optical axis 23c of the sixth lens 23 is inclined with respect to the optical axis A. When the sixth lens 23 is inclined, the pressing force of the pressing member 9 becomes asymmetric with respect to the optical axis A. For example, a pressing force F1 is applied to a portion of the sixth lens 23, and a pressing force F2 greater than the pressing force F1 is applied to another portion of the sixth lens 23. As a result, the pressing force applied to the fifth lens 22 and the fourth lens 21 via the sixth lens 23 based on the pressing force F1 and the pressing force F2 is asymmetric with respect to the optical axis A (i.e., an asymmetric pressing force).

[0079] When the lens unit expands and contracts according to the change of the ambient temperature while applying asymmetrical pressing force with respect to the optical axis A, each lens in the lens unit moves in its radial direction and sometimes becomes decentered. Due to the decentered lens, aberrations such as coma and distortion occur, and the performance of the lens unit changes.

[0080] For example, a surface substantially perpendicular to the optical axis A is formed in an area outside the optically effective area of ​​the lens so that an asymmetric pressing force relative to the optical axis A is not applied, and the surface is pressed. Thus, positional displacement caused by an asymmetric pressing force relative to the optical axis A can be prevented. However, the cost of forming a surface substantially perpendicular to the optical axis increases. In addition, if a machining allowance area (machining allowance) is provided on the lens in order to form a surface substantially perpendicular to the optical axis A, the thickness of the lens becomes thicker, and the design of the lens unit 100 may be restricted. In addition, in order to form a surface substantially perpendicular to the optical axis A outside the optically effective surface of the lens, the outer diameter of the lens also becomes larger, which sometimes creates constraints on the layout.

[0081] In this embodiment, as shown in FIG. Figure 1 As described, the elastic member 7 is disposed between the first lens group 30 and the second lens group 40. Therefore, even if the pressure applied to the second lens group 40 including the sixth lens 23 is asymmetric with respect to the optical axis A, the pressure is substantially absorbed by the elastic member 7 and is substantially not transmitted to the first lens group 30. Therefore, the decentering of the first lens group 30 caused by the asymmetric pressure applied to the first lens group 30 with respect to the optical axis A can be suppressed.

[0082] In some embodiments, in the lens unit, the plurality of lenses include: a first lens group including a plane receiving lens having a pressed plane perpendicular to the axial direction; and a second lens group including an inclined receiving lens having an inclined surface to be pressed inclined relative to the axial direction. The elastic member is located between the first lens group and the second lens group.

[0083] In the sixth lens 23, since the first spherical surface 231 is pressed, the radial movement thereof is reduced by the pressing force. Therefore, even if the ambient temperature around the lens unit changes, the lens unit hardly moves.

[0084] As a result, according to this embodiment, the lens unit 100 in which the changes in the shapes and positions of the plurality of lenses are suppressed can be obtained. In this embodiment, the performance changes of the lens unit 100 are suppressed by suppressing the changes in the shapes and positions of the plurality of lenses.

[0085] Figure 3A and 3B It is a diagram showing a method of supporting the sixth lens according to a modification of the first embodiment. Figure 3A 2 is a diagram showing a method of supporting the sixth lens 23a without lens deformation. Figure 3B It is a diagram showing a method of supporting the sixth lens 23a having lens deformation.

[0086] In Fig. 3, the sixth lens 23a is accommodated in the lens barrel 1 and supported by the support member 7a. The support member 7a has a threaded portion in the region 71a and is fixed to the lens barrel 1 via the threaded portion by, for example, coupling. The fixing of the support member 7a is not limited to fixing by the combination of the threaded portion, and may also be performed by heat riveting or bonding.

[0087] The sixth lens 23a, for example, comprises a resin material such as polycarbonate (PC) or glass. The lens barrel 1, for example, comprises a metal material such as aluminum, a resin material such as polyphenylene sulfide (PPS). Therefore, the material of the sixth lens 23a is different from the material of the lens barrel 1. Since the linear expansion coefficient is different depending on the material, when the ambient temperature changes, the expansion amount and the contraction amount of the sixth lens 23a and the lens barrel 1 are different.

[0088] exist Figure 3B In the embodiment of FIG. 1 , the sixth lens 23a1 is relatively contracted with respect to the lens barrel 1 . On the other hand, the sixth lens 23a2 is relatively expanded with respect to the lens barrel 1 .

[0089] When the linear expansion coefficient of the sixth lens 23a is smaller than the linear expansion coefficient of the lens barrel 1, as the ambient temperature around the lens unit increases, the expansion amount of the sixth lens 23a is relatively small relative to the expansion amount of the lens barrel 1. Therefore, like the sixth lens 23a1, the sixth lens 23a becomes relatively small relative to the lens barrel 1, and the supporting force of the supporting member 7a is reduced.

[0090] On the other hand, the amount of contraction of the sixth lens 23a caused by the decrease in ambient temperature is relatively small relative to the amount of contraction of the lens barrel 1. Therefore, like the sixth lens 23a2, the sixth lens 23a becomes relatively large relative to the lens barrel 1, and the supporting force of the supporting member 7a increases. When the linear expansion coefficient of the sixth lens 23a is greater than the linear expansion coefficient of the lens barrel 1, the opposite effect can be obtained. That is, the supporting force of the supporting member 7a changes according to the ambient temperature around the lens unit.

[0091] When the material of the sixth lens 23a is resin, the sixth lens 23a is easily deformed by the supporting force because the Young's modulus of the resin is low. Therefore, when the ambient temperature around the lens unit changes, the supporting force changes, the deformation amount of the sixth lens 23a also changes, and the performance of the sixth lens 23a changes greatly. In addition, because the resin creeps under high temperature environment, the supporting property decreases over time. As a result, the deformation amount of the sixth lens 23a changes, and the performance of the sixth lens 23a changes.

[0092] When the material of the sixth lens 23a is glass, since glass is harder than resin, the deformation of glass is smaller than that of resin, thereby having little effect on the performance of the sixth lens 23a. However, since glass is easily broken, when the supporting force of the sixth lens 23a increases, the sixth lens 23a may be broken and damaged.

[0093] For example, when a member having elasticity is used as the supporting member 7a, even if the relative size of the sixth lens 23a with respect to the lens barrel 1 changes due to a change in the ambient temperature around the lens unit 100, the supporting member 7a can absorb the change in size due to its elasticity. As a result, in the lens unit 100, when the temperature changes, it is possible to reduce lens deformation and lens breakage caused by changes in the supporting force caused by the expansion and contraction of the member.

[0094] In addition, as described above, when the sixth lens 23a is supported by the elastic member 7, when the ambient temperature around the lens unit changes, the change in the pressing force applied from the pressing member 9 can be reduced. However, when the elastic member 7 is used, when the ambient temperature changes, the pressing force applied from the pressing member 9 changes according to the elastic coefficient of the elastic member 7. The radial movement is suppressed by the friction force correspondingly generated with the pressing force. When the ambient temperature around the lens unit changes, the friction force also changes according to the change in the pressing force. The lens can move in the radial direction according to the change of this friction force and the difference in the amount of expansion and contraction caused by the difference in the linear expansion coefficient between the members. As a result, the performance of the lens unit may change.

[0095] As a result of intensive research, the present inventors have found that the decentering of the lens caused by repeated changes in ambient temperature can be reduced by using an elastic member 7 that satisfies the following formula (1).

[0096] (1)

[0097] In expression (1):

[0098] K (N / mm) is the elastic coefficient of the elastic member 7 .

[0099] F(N) is an elastic force by which the elastic member 7 presses each of the fourth lens 21 , the fifth lens 22 , and the sixth lens 23 .

[0100] T (° C.) is an ambient temperature range in which the lens unit 100 can be used.

[0101] n is the number of members pressed mainly by the elastic force of the elastic member 7 .

[0102] αi (1 / °C) is a linear expansion coefficient of each of the fourth lens 21 and the fifth lens 22, and the fourth lens 21 and the fifth lens 22 correspond to a plurality of accommodating members accommodated in the lens barrel 1 and pressed mainly by the elastic force of the elastic member 7 (herein, the fourth lens 21 and the fifth lens 22 are simply referred to as a plurality of accommodating members).

[0103] Li (mm) is the length of each of the plurality of housing members in the direction along the optical axis A, and i is a natural number.

[0104] α0 (1 / ° C.) is the linear expansion coefficient of the lens barrel 1 .

[0105] L0 (mm) is the length of the lens barrel 1 in the direction along the optical axis A, and L0 = ΣLi.

[0106] In some embodiments, a lens unit includes:

[0107] A plurality of lenses are arranged axially along the optical axis;

[0108] a lens barrel, in which the plurality of lenses are accommodated;

[0109] an elastic member configured to support at least one of the plurality of lenses in the lens barrel; and

[0110] a pressing member configured to press the plurality of lenses in the lens barrel,

[0111] Among them, the following expression (1) is satisfied:

[0112] (1)

[0113] Here:

[0114] K is the elastic coefficient of the elastic member,

[0115] F is an elastic force of the elastic member pressing the plurality of lenses.

[0116] t is the ambient temperature range in which the lens unit is allowed to be used,

[0117] n is the number of the plurality of lenses pressed by the elastic member with the elastic force of the elastic member,

[0118] αi is a linear expansion coefficient of each of the plurality of lenses in the lens barrel pressed by the elastic member,

[0119] Li is the length of each of the plurality of lenses in the axial direction,

[0120] α0 is the linear expansion coefficient of the lens barrel,

[0121] L0 is the length of the lens barrel in the axial direction.

[0122] Figure 4 Through simulation Figure 1 This is a graph showing the results of evaluating the movement amount of each lens of the rear lens group of the lens unit during each temperature cycle. Figure 4 The horizontal axis in represents the value of the left side in expression (1). Figure 4 The vertical axis is the radial movement of the lens per temperature cycle.

[0123] In the simulation, the temperature cycle was performed 30 times, and the tilt was calculated from the movement amount of the first and last lenses. As the temperature cycle, one cycle sequentially includes normal temperature, the lower limit of the expected use temperature range (e.g., -40°C), the upper limit of the expected use temperature range (e.g., 105°C), and normal temperature.

[0124] The fourth lens 21 and the fifth lens 22 are accommodated in the lens barrel 1. The fifth lens has a surface facing the image. The elastic force F from the elastic member 7 is applied to the above-mentioned surface of the fifth lens 22. When the ambient temperature changes, the pressing force is changed in consideration of the change in the pressing force obtained by multiplying the difference between the change in the length of the lens barrel 1 in the direction along the optical axis A and the change in the length of the fourth lens 21 and the fifth lens 22 in the direction along the optical axis A by the elastic constant K.

[0125] according to Figure 4 As a result, when the value of the left side of expression (1) exceeds about 0.1, the movement amount of the lens in the radial direction increases rapidly.

[0126] Figure 5 yes Figure 1: An enlarged view of the fourth lens 21 and the fifth lens 22 in the lens unit 100. For example, the fourth lens 21 and the fifth lens 22 are made of resin, and the lens barrel 1 is made of metal (for example, aluminum). When the values ​​of the following variables and constants are substituted into the above expression (1), the value on the left side of the expression (1) is 0.031 and is less than 0.1. Therefore, the expression (1) is satisfied.

[0127] Elastic coefficient of elastic member 7: K = 12 (N / mm)

[0128] Elastic force of elastic member 7: F = 7 (N)

[0129] The linear expansion coefficient of the fourth lens 21 is: α1 = 60 × 10 -6 (1 / ℃)

[0130] Length of the fourth lens 21: L1 = 2 (mm)

[0131] The linear expansion coefficient of the fifth lens 22: α2 = 66 × 10 -6 (1 / ℃)

[0132] Length of the fifth lens 22: L2 = 2 (mm)

[0133] Linear expansion coefficient of lens barrel 1: α0 = 24 × 10 -6 (1 / ℃)

[0134] Length of lens barrel 1: L0 = 4 (mm)

[0135] Ambient temperature range: t = 115 (°C) (-30°C to 85°C)

[0136] The elastic member 7 includes a plate-shaped spring member made of, for example, a metal material. Specifically, the elastic member 7 is a wave washer made of stainless steel (SUS). The wave washer has an outer diameter of 13 mm, an inner diameter of 9 mm, a thickness of 0.1 mm, a wave number of 3, a free length of 1.1 mm, and a length of 0.5 mm in the direction along the optical axis A when the elastic member 7 contracts at a constant rate.

[0137] The elastic member 7 uses a material such as stainless steel because the creep effect on metal in a high temperature environment is smaller than that of resin or rubber. When the material of the elastic member 7 is resin or rubber, the creep increases in a high temperature environment, and the elastic force decreases over time, so that the sixth lens 23 may not be stably supported. On the other hand, since the elastic member 7 is composed of a metal material, the sixth lens 23 can be stably supported. Therefore, in this embodiment, a lens unit 100 that suppresses changes in the shapes and positions of multiple lenses and can maintain the good performance of the lens unit 100 for a long time can be provided.

[0138] In some embodiments, in the lens unit, the elastic member includes a leaf spring including a metal material.

[0139] In this embodiment, while the pressing member 9 presses the elastic member 7, the length of the elastic member 7 along the direction of the optical axis A is substantially constant. Thus, the elastic force of the elastic member 7 is substantially constant, and the components of the lens unit 100 can be stabilized and their positions do not change. In addition, since the length of the elastic member 7 along the direction of the optical axis A is limited, the distance between the fifth lens 22 and the sixth lens 23 can be substantially constant, and the performance of the lens unit 100 can be stabilized.

[0140] In some embodiments, in the lens unit, a length of the elastic member in the axial direction is constant in a state where the elastic member is pressed by the pressing member.

[0141] In this embodiment, the lens unit 100 has an intervening member 8 that contacts the elastic member 7 in a plane substantially perpendicular to the optical axis A. The elastic member 7 supports the sixth lens 23 (supported lens) via the intervening member 8. The second spherical surface 232 of the sixth lens 23 faces the elastic member 7 and is inclined relative to the optical axis A.

[0142] For example, when the elastic member 7 and the second spherical surface 232 of the sixth lens 23 contact each other, the second spherical surface 232 of the sixth lens 23 is inclined relative to the optical axis A, so that the pressing force can become asymmetric relative to the optical axis A (ie, asymmetric pressing force).

[0143] In the present embodiment, the lens unit 100 supports the sixth lens 23 via the elastic member 7 and the intervening member 8 abutting against the elastic member 7 on a plane substantially perpendicular to the optical axis A, so that the pressing force is substantially symmetrical with respect to the optical axis A. Therefore, the movement of the lens caused by the asymmetric pressing force with respect to the optical axis A is reduced, and the performance of the lens unit 100 is less likely to change.

[0144] In order to obtain a stable elastic force of the elastic member 7 and a stable optical performance of the lens unit 100, it is preferable that the intervening member 8 is in contact with the lens barrel 1. Therefore, it is preferable that the pressing force applied by the pressing member 9 through the intervening member 8 via the sixth lens 23 is increased relative to the elastic force when the elastic member 7 supports the sixth lens 23.

[0145] In the present embodiment, the fourth lens 21, the fifth lens 22, and the sixth lens 23 (ie, a plurality of lenses) may include at least one resin lens made of resin. By using the resin lens, the cost of the lens unit 100 can be reduced.

[0146] In some embodiments, in the lens unit, the plurality of lenses includes at least one resin lens.

[0147] Second embodiment

[0148] Next, the lens unit of the second embodiment is described. In the second embodiment, the same reference numerals are used for the same structural elements as those of the first embodiment, and repeated descriptions are appropriately omitted. However, for convenience, even if the components are different from those of the first embodiment, the same names may be used for components (e.g., the first lens) whose names include numbers indicating the order. These are also the same in the following embodiments.

[0149] Figure 6 1 is a cross-sectional view showing the structure of the lens unit of the second embodiment in the longitudinal direction. The lens unit 100a includes a first lens group 50, a second lens group 60, a first insertion member 31, a second insertion member 32, a light shielding member 33, an elastic member 34, and a pressing member 35. The first lens group 50 includes a first lens 36, a second lens 37, and a third lens 38.

[0150] The first lens 36 , the first insertion member 31 , the second lens 37 , the second insertion member 32 , the light shielding member 33 , the elastic member 34 , the third lens 38 , and the pressing member 35 are arranged in this order from the positive Z direction to the negative Z direction.

[0151] The pressing member 35 has a threaded portion on its exterior. The lens barrel 1a has a threaded portion at a portion of the interior in the -Z direction. The threaded portion of the pressing member 35 is coupled to each threaded portion of the lens barrel 1b, thereby fixing each member housed in the lens barrel 1b.

[0152] The first lens 36 and the second lens 37 supported by the elastic member 34 correspond to a plane-bearing lens in which a surface substantially perpendicular to the optical axis A is pressed. In the third lens 38 pressed by the pressing member 35, one surface facing the elastic member 34 (i.e., facing the positive Z direction) is a plane, and the other surface facing the pressing member 35 (i.e., facing the negative Z direction) is a spherical surface. Therefore, the third lens 38 corresponds to a tilt-bearing lens.

[0153] The third lens 38 is positioned and fixed by a clearance fit. The third lens 38 has a clearance in the radial direction. Therefore, when the third lens 38 is offset and arranged, the third lens 38 is tilted and contacts the pressing member 35. The pressing force of the pressing member 35 is asymmetric with respect to the optical axis A. The third lens 38 is used as a limiting member to limit the length of the elastic member 34 in the direction along the optical axis A.

[0154] When the material of the elastic member 34 is metal, when the light incident from the positive Z direction is reflected by the elastic member 34, the light is repeatedly reflected regularly (i.e., regular reflected light) or repeatedly reflected diffusely (i.e., diffuse reflected light), and is incident on the image sensor arranged on the image side of the lens unit 100a. Such regular reflected light or diffuse reflected light becomes glare or ghosting in the captured image.

[0155] In this embodiment, by configuring a shading member 33 at a position adjacent to the elastic member 34, the above-mentioned glare or ghosting light is difficult to occur. However, it is also possible not to provide a shading member 33, but to reduce the luster unique to the metal by coating or plating the elastic member 34, thereby reducing the regular reflected light or diffuse reflected light from the elastic member 34.

[0156] For example, the first lens 36 is made of glass, and the second lens 37 is made of resin. In addition, the lens barrel 1a, the first insertion member 31, and the second insertion member 32 are made of metal such as aluminum, and the light shielding member 33 is made of metal, particularly stainless steel. When the values ​​of the following variables and constants are substituted into the above expression (1), the left side of the expression (1) is 0.020, which is less than 0.1.

[0157] Therefore, Expression (1) is satisfied.

[0158] Elastic coefficient of elastic member 34: K = 43 (N / mm)

[0159] Elastic force of elastic member 34: F = 17 (N)

[0160] Linear expansion coefficient of the first lens 36: α1 = 10 × 10 -6 (1 / ℃)

[0161] Length of the first lens 36: L1 = 2 (mm)

[0162] The linear expansion coefficient of the first insertion member 31 is: α2 = 24 × 10 -6 (1 / ℃)

[0163] Length of the first insertion member 31: L2 = 3 (mm)

[0164] The linear expansion coefficient of the second lens 37 is: α3 = 66 × 10 -6 (1 / ℃)

[0165] Length of the second lens 37: L3 = 2 (mm)

[0166] The linear expansion coefficient of the second insertion member 32 is: α4=24×10 -6 (1 / ℃)

[0167] Length of the second insertion member 32: L4 = 1.5 (mm)

[0168] Linear expansion coefficient of the light shielding member 33: α5 = 19 × 10 -6 (1 / ℃)

[0169] The length L5 of the light shielding member 33 = 0.03 (mm)

[0170] The linear expansion coefficient of the lens barrel 1a: α0 = 24 × 10 -6 (1 / ℃)

[0171] 1a: The length of the lens barrel L0 = 8.53 (mm)

[0172] Ambient temperature range: t = 145 (℃) (-40℃ to 105℃)

[0173] The elastic member 34 includes, for example, a plate-shaped spring including a metal material. Specifically, the elastic member 34 is a wave washer made of stainless steel (SUS). The wave washer has an outer diameter of 16 mm, an inner diameter of 12 mm, a thickness of 0.2 mm, a wave number of 3, a free length of 0.8 mm, and a length of 0.4 mm in the direction along the optical axis A of the elastic member 34 when the elastic member 34 contracts at a constant rate.

[0174] When the pressing force of the pressing member 35 is set to 100 N, the pressing force is greater than the elastic force of the elastic member 34 of 17 N, so that the third lens 38 can abut against the lens barrel 1 a. In this embodiment, the same effects as those of the first embodiment can be obtained.

[0175] Third embodiment

[0176] Next, a lens unit according to a third embodiment will be described.

[0177] Figure 7 1 is a cross-sectional view showing the structure of the lens unit 100b in the length direction of the first example of the third embodiment. The lens unit 100b includes a first lens group 70, a second lens group 80, an elastic member 41, a first intervening member 42, a second intervening member 43, and a pressing member 44. The first lens group 70 includes a first lens 45 and a second lens 46. The second lens group 80 includes a third lens 47 and a fourth lens 48.

[0178] In the lens barrel 1 b , a first lens 45 , a second lens 46 , an elastic member 41 , a first intervening member 42 , a third lens 47 , a second intervening member 43 , a fourth lens 48 , and a pressing member 44 are accommodated in order from the +Z direction to the −Z direction.

[0179] The pressing member 44 has a threaded portion on its exterior. A portion of the interior of the lens barrel 1b in the -Z direction has a threaded portion. By coupling the threaded portion of the pressing member 44 with the threaded portions of the lens barrel 1b, the components housed in the lens barrel 1b are fixed.

[0180] The first lens 45 and the second lens 46 supported by the elastic member 41 correspond to the plane bearing lens in which the surface roughly perpendicular to the optical axis A is pressed. In the third lens 47 pressed by the pressing member 44, one surface facing the elastic member 41 (i.e., facing the positive Z direction) is a spherical surface, and the other surface facing the pressing member 44 (i.e., facing the negative Z direction) is a spherical surface. Therefore, the third lens 47 corresponds to the tilt bearing lens. The fourth lens 48 pressed by the pressing member 44 corresponds to the plane bearing lens in which the surface roughly perpendicular to the optical axis A is pressed. The first intervening member 42 is assembled into the lens barrel 1b and serves as a limiting member to limit the length of the elastic member 41 in the direction along the optical axis A.

[0181] In some embodiments, the lens unit further includes a light shielding member adjacent to the elastic member.

[0182] In some embodiments, in the lens unit, the second lens group includes: a tilt-bearing lens; another plane-bearing lens having a pressed plane perpendicular to the axial direction; and another intervening member between the tilt-bearing lens and the other plane-bearing lens, the other intervening member having a surface perpendicular to the axial direction, which contacts the inclined surface of the tilt-bearing lens.

[0183] In some embodiments, in the lens unit, the second lens group includes: a tilt-bearing lens; another tilt-bearing lens having a pressed inclined surface inclined relative to the axial direction; and another intervening member located between the tilt-bearing lens and the other tilt-bearing lens, wherein the other intervening member has a surface perpendicular to the axial direction, which contacts the inclined surface of the tilt-bearing lens.

[0184] For example, the first lens 45 and the second lens 46 are made of resin, and the lens barrel 1b is made of resin, such as PPS. When the values ​​of the following variables and constants are substituted into the above expression (1), the left side of the expression (1) is 0.045, which is less than 0.1. Therefore, the expression (1) is satisfied.

[0185] Elastic coefficient of elastic member 41: K = 20 (N / mm)

[0186] Elastic force of elastic member 41: F = 12 (N)

[0187] Linear expansion coefficient of the first lens 45: α1 = 60 × 10 -6 (1 / ℃)

[0188] Length of the first lens 45: L1 = 2.5 (mm)

[0189] The linear expansion coefficient of the second lens 46 is: α2 = 66 × 10 -6 (1 / ℃)

[0190] Length of the second lens 46: L2 = 2.5 (mm)

[0191] The linear expansion coefficient of the lens barrel 1b: α0 = 26 × 10 -6 (1 / ℃)

[0192] Length of lens barrel 1a: L0 = 5 (mm)

[0193] Ambient temperature range: t = 145 (℃) (-40℃ to 105℃)

[0194] The elastic member 41 includes a plate-shaped spring made of, for example, a metal material. Specifically, the elastic member 34 is a wave washer made of stainless steel (SUS). The wave washer has an outer diameter of 13 mm, an inner diameter of 9 mm, a thickness of 0.12 mm, a wave number of 3, a free length of 0.9 mm, and a length of 0.3 mm in the direction along the optical axis A of the elastic member 41 when the elastic member 41 contracts at a constant rate.

[0195] When the pressing force of the pressing member 44 is set to 150 N, the pressing force is greater than the elastic force 12 N of the elastic member 41. Thus, the first intervening member 42 can abut against the lens barrel 1b. In the lens unit 100b, the same effects as those of the lens unit 100 according to the first embodiment can be obtained.

[0196] Figure 8 1 is a cross-sectional view showing the structure of a lens unit 100c in the longitudinal direction of a second example of the third embodiment. The lens unit 100c includes a second lens group 90, a second intervening member 51, and a pressing member 52. The second lens group 90 includes a third lens 47 and a fourth lens 53.

[0197] In the lens barrel 1 b , a first lens 45 , a second lens 46 , an elastic member 41 , a first intervening member 42 , a third lens 47 , a second intervening member 51 , a fourth lens 53 , and a pressing member 52 are accommodated in order from the +Z direction to the −Z direction.

[0198] The pressing member 52 has a threaded portion on its exterior. A portion of the interior of the lens barrel 1b in the -Z direction has a threaded portion. By coupling the threaded portion of the pressing member 52 with the threaded portions of the lens barrel 1b, the components housed in the lens barrel 1b are fixed.

[0199] The fourth lens 53 pressed by the pressing member has one surface facing the elastic member 41 (ie, facing the positive Z direction) and another surface facing the pressing member 52 (ie, facing the negative Z direction).

[0200] As in the above-described lens unit 100b, when the second lens group 80 includes a plane-receiving lens such as the fourth lens 48, the fourth lens 48 of the lens unit 100b receives pressure from the third lens 47 that is asymmetric about the optical axis A. Therefore, when the ambient temperature around the lens unit changes, and the lens unit expands and contracts, the fourth lens 48 may move in the radial direction and be decentered.

[0201] like Figure 8 As shown, in the lens unit 100b, by using the spherical lens, that is, the fourth lens 53 instead of the fourth lens 48, the cost of the lens unit 100c can be reduced, and the radial movement of the fourth lens 53 can be reduced. Other effects are the same as those of the lens unit 100 according to the first embodiment.

[0202] When it is difficult to arrange the fourth lens 53 as a spherical lens due to layout restrictions, it is preferable to use a fourth lens having a shape that has little influence on the performance of the lens unit even if it moves in the radial direction.

[0203] The above embodiments are described as examples, and the present invention is not limited to the above embodiments. The above embodiments can be implemented in various other ways, and various combinations, omissions, substitutions, and changes can be made without departing from the scope of the present invention. These embodiments and their variations are included in the scope and spirit of the present invention, and are included in the invention described in the claims and their equivalents.

[0204] Embodiments of the present invention are described as follows:

[0205] In a first aspect, a lens unit comprises:

[0206] A plurality of lenses are arranged axially along the optical axis, the plurality of lenses comprising:

[0207] A first lens group includes a plane receiving lens having a pressed plane perpendicular to the axial direction; and

[0208] The second lens group includes a tilt receiving lens having a pressed tilt surface tilted relative to the axial direction,

[0209] a lens barrel, in which the plurality of lenses are accommodated;

[0210] an elastic member located between the first lens group and the second lens group, the elastic member being configured to support at least one of the plurality of lenses in the lens barrel; and

[0211] The pressing member is configured to press the plurality of lenses in the lens barrel.

[0212] In a second aspect, a lens unit comprises:

[0213] A plurality of lenses are arranged axially along the optical axis;

[0214] a lens barrel, in which the plurality of lenses are accommodated;

[0215] an elastic member configured to support at least one of the plurality of lenses in the lens barrel; and

[0216] a pressing member configured to press the plurality of lenses in the lens barrel,

[0217] Among them, the following expression (1) is satisfied:

[0218] (1)

[0219] Here:

[0220] K is the elastic coefficient of the elastic member,

[0221] F is an elastic force of the elastic member pressing the plurality of lenses.

[0222] t is the ambient temperature range in which the lens unit is allowed to be used,

[0223] n is the number of the plurality of lenses pressed by the elastic member with the elastic force of the elastic member,

[0224] αi is a linear expansion coefficient of each of the plurality of lenses in the lens barrel pressed by the elastic member,

[0225] Li is the length of each of the plurality of lenses in the axial direction,

[0226] α0 is the linear expansion coefficient of the lens barrel,

[0227] L0 is the length of the lens barrel in the axial direction.

[0228] In a third aspect, in the lens unit according to the second aspect, the plurality of lenses include:

[0229] A first lens group includes a plane receiving lens having a pressed plane perpendicular to the axial direction; and

[0230] The second lens group includes a tilt receiving lens having a pressed tilt surface tilted relative to the optical axis,

[0231] Wherein, the elastic component is located between the first lens group and the second lens group.

[0232] In a fourth aspect, in the lens unit according to the first aspect or the second aspect, in a state where the elastic member is pressed by the pressing member, a length of the elastic member in the axial direction is constant.

[0233] In a fifth aspect, in the lens unit according to any one of the first to fourth aspects, the inclined surface of the tilt receiving lens is a spherical surface.

[0234] In a sixth aspect, in the lens unit according to any one of the first to fifth aspects, an intervening member is further included, which has a surface perpendicular to the axial direction, the surface contacts the elastic member,

[0235] wherein the intervening member supports the tilt bearing lens,

[0236] The elastic member supports the tilt receiving lens via the intervening member, and

[0237] The tilt receiving lens has an inclined surface that faces the plane receiving lens of the first lens group and is inclined relative to the axial direction.

[0238] In a seventh aspect, in the lens unit according to any one of the first to sixth aspects, the plurality of lenses include at least one resin lens.

[0239] In an eighth aspect, in the lens unit according to any one of the first to seventh aspects, the elastic member includes a leaf spring including a metal material.

[0240] In a ninth aspect, in the lens unit according to any one of the first to eighth aspects, a light shielding member adjacent to the elastic member is further included.

[0241] In a tenth aspect, in the lens unit according to any one of the first to ninth aspects, the second lens group includes:

[0242] Tilt to bear the lens;

[0243] The other plane receives the lens and has a pressed plane perpendicular to the axial direction; and

[0244] another intervening member, located between the tilted receiving lens and the another plane receiving lens,

[0245] The other intervening member has a surface perpendicular to the axial direction, and the surface contacts the inclined surface of the tilt receiving lens.

[0246] In an eleventh aspect, in the lens unit according to any one of the first to ninth aspects, the second lens group includes:

[0247] Tilt to bear the lens;

[0248] Another tilt receiving lens has a pressed tilt surface tilted relative to the axial direction; and

[0249] another intervening member, located between the tilt-bearing lens and the other tilt-bearing lens,

[0250] The other intervening member has a surface perpendicular to the axial direction, and the surface contacts the inclined surface of the tilt receiving lens.

[0251] The above embodiments are illustrative and do not limit the present invention. Therefore, many additional modifications and variations are possible based on the above teachings. For example, within the scope of the present invention, the elements and / or characteristics of different illustrative embodiments can be combined and / or replaced with each other.

[0252] This patent application is based upon and claims the benefit of priority from Japanese patent application No. 2022-075143 filed with the Japan Patent Office on April 28, 2022, the disclosure of which is incorporated herein in its entirety by reference.

[0253] Reference numerals list

[0254] 1. 1a, 1b, 1c lens tube

[0255] 2Front lens pressing member

[0256] 3Front lens shading member

[0257] 4Front lens elastic member

[0258] 5First front lens spacing member

[0259] 6Second front lens spacing member

[0260] 7,34,41 Elastic components

[0261] 7a Supporting member

[0262] Area 71a

[0263] 8 Intervention Components

[0264] 9, 35, 44, 52 pressing components

[0265] 10 front lens group

[0266] 11, 36, 45 first lens

[0267] 12, 37, 46 Second lens

[0268] 13, 38, 47 Third lens

[0269] 20 rear lens group

[0270] 21, 48, 53 fourth lens

[0271] 21a, 22a plane portion

[0272] 22 Fifth lens

[0273] 23, 23a, 23a1, 23a2 sixth lens

[0274] 231 First Sphere

[0275] 232 Second Sphere

[0276] 23c optical axis

[0277] 30, 50, 70 first lens group

[0278] 31, 42 first intervention component

[0279] 32, 43, 51 Second intervening component

[0280] 33 Shading member

[0281] 40, 60, 80, 90 second lens group

[0282] 100, 100a, 100b, 100c lens units

[0283] A-axis

[0284] F0, F1, F2 pressing force

Claims

1. A lens unit, comprising: A plurality of lenses are arranged axially along the optical axis, the plurality of lenses comprising: A first lens group includes a plane receiving lens having a pressed plane perpendicular to the axial direction; as well as The second lens group includes a tilt receiving lens having a pressed tilt surface tilted relative to the axial direction, a lens barrel, in which the plurality of lenses are accommodated; an elastic member located between the first lens group and the second lens group, the elastic member being configured to support at least one of the plurality of lenses in the lens barrel; as well as The pressing member is configured to press the plurality of lenses in the lens barrel.

2. A lens unit, comprising: A plurality of lenses are arranged axially along the optical axis; a lens barrel, in which the plurality of lenses are accommodated; an elastic member configured to support at least one of the plurality of lenses in the lens barrel; as well as A pressing member configured to press the plurality of lenses in the lens barrel, Among them, the following expression (1) is satisfied: (1) Here: K is the elastic coefficient of the elastic member, F is an elastic force of the elastic member pressing the plurality of lenses. t is the ambient temperature range in which the lens unit is allowed to be used, n is the number of the plurality of lenses pressed by the elastic member with the elastic force of the elastic member, αi is a linear expansion coefficient of each of the plurality of lenses in the lens barrel pressed by the elastic member, Li is the length of each of the plurality of lenses in the axial direction, α0 is the linear expansion coefficient of the lens barrel, L0 is the length of the lens barrel in the axial direction.

3. The lens unit according to claim 2, in, The plurality of lenses comprises: A first lens group includes a plane receiving lens having a pressed plane perpendicular to the axial direction; as well as The second lens group includes a tilt receiving lens having a pressed tilt surface tilted relative to the optical axis, Wherein, the elastic component is located between the first lens group and the second lens group.

4. The lens unit according to claim 1 or 3, in, In a state where the elastic member is pressed by the pressing member, the length of the elastic member in the axial direction is constant.

5. The lens unit according to claim 1 or 3, in, The inclined surface of the tilt receiving lens is a spherical surface.

6. The lens unit according to claim 1 or 3, further comprising: an intervening member having a surface perpendicular to the axial direction, the surface contacting the elastic member, in, The intervening member supports the tilt bearing lens, The elastic member supports the tilt receiving lens via the intervening member, and The tilt receiving lens has an inclined surface that faces the plane receiving lens of the first lens group and is inclined relative to the axial direction.

7. The lens unit according to claim 1 or 2, in, The plurality of lenses includes at least one resin lens.

8. The lens unit according to claim 1 or 2, in, The elastic member includes a leaf spring including a metal material. 9 . The lens unit according to claim 1 , further comprising a light shielding member adjacent to the elastic member.

10. The lens unit according to claim 1 or 2, in, The second lens group comprises: Tilt to bear the lens; The other plane receives the lens and has a pressed plane perpendicular to the axial direction; and another intervening member, located between the tilted receiving lens and the another plane receiving lens, The other intervening member has a surface perpendicular to the axial direction, and the surface contacts the inclined surface of the tilt receiving lens.

11. The lens unit according to claim 1 or 2, in, The second lens group comprises: Tilt to bear the lens; Another tilt receiving lens has a pressed tilt surface tilted relative to the axial direction; and another intervening member, located between the tilt-bearing lens and the other tilt-bearing lens, The other intervening member has a surface perpendicular to the axial direction, and the surface contacts the inclined surface of the tilt receiving lens.

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