Lens unit, lens holder, and imaging apparatus

Abstract

The invention discloses a lens unit, a lens holder, and an imaging apparatus. A lens unit includes: a first resin lens; and a second resin lens superimposed on the first resin lens, in which the first resin lens includes a first convex portion on a surface facing the second resin lens, in which the second resin lens includes a first concave portion on a surface facing the first resin lens, the first convex portion being engageable with the first concave portion, and the second convex portion being engageable with the first concave portion on a surface facing the second resin lens. And wherein a gate position of the first resin lens and a gate position of the second resin lens do not overlap each other in a rotation direction about the optical axis even in a state in which the first convex portion is fitted into any one of the first concave portions.

Description

Technical Field

[0001] The present invention relates to a lens unit, a lens holder and an imaging device. Background Art

[0002] As the precision of imaging devices increases and communication technology advances, imaging devices are mounted on various devices, and the demand for small lenses increases. In particular, from the perspective of space saving, a lens unit stacked with small lenses is desirable. However, when the lenses of the lens unit are aligned with each other, in some cases, sufficient alignment is not achieved due to the size difference between the lenses.

[0003] International Publication No. 2015 / 111703 discusses a form in which three convex portions are provided on a first single lens and three concave portions are provided on a second single lens as positioning portions, and at least two of the positioning portions are different in inherent restricting directions. Summary of the invention

[0004] According to one aspect of the present invention, a lens unit includes: a first resin lens; and a second resin lens, which is superimposed on the first resin lens, wherein the first resin lens includes a first convex portion on a surface facing the second resin lens, wherein the second resin lens includes a first concave portion on a surface facing the first resin lens, the first convex portion can be embedded in the first concave portion, and wherein even in a state where the first convex portion is embedded in any one of the first concave portions, the gate position of the first resin lens and the gate position of the second resin lens do not overlap with each other in the rotation direction around the optical axis.

[0005] According to another aspect of the present invention, a lens unit includes: a first resin lens; a second resin lens, which is superimposed on the first resin lens; and a third resin lens, which is superimposed on the second resin lens on the opposite side to the first resin lens, wherein the first resin lens includes a first convex portion on a surface facing the second resin lens, wherein the second resin lens includes a first concave portion on a surface facing the first resin lens, and the first convex portion can be embedded in the first concave portion, wherein the number of the first concave portions is greater than the number of the first convex portions, wherein the second resin lens includes a second convex portion on a surface facing the third resin lens, wherein the third resin lens includes a second concave portion on a surface facing the second resin lens, and the second convex portion can be embedded in the second concave portion, and wherein the number of the second concave portions is greater than the number of the second convex portions.

[0006] Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a perspective view of a lens unit according to the first exemplary embodiment.

[0008] Figure 2 is a top view of the lens unit according to the first exemplary embodiment.

[0009] Figure 3 It is along Figure 2 A cross-sectional view of the lens unit taken along line AA in FIG.

[0010] Figure 4 is a top view of the first lens.

[0011] Figure 5 is a top view of the second lens.

[0012] Figure 6 is a top view of the third lens.

[0013] Figure 7 is a top view of a lens unit according to a second exemplary embodiment.

[0014] Figure 8 is a diagram illustrating multi-cavity molding for multiple lenses.

[0015] Fig. 9 is a perspective view of a lens unit according to a first comparative example.

[0016] Fig.10 is a top view of a lens unit according to a first comparative example.

[0017] Fig.11 It is along Fig.10 A cross-sectional view taken along line BB in FIG.

[0018] Fig.12 is a top view of a second lens according to a second comparative example.

[0019] Fig.13 is a top view of a third lens according to a second comparative example.

[0020] Fig.14 is a diagram illustrating an imaging device as an example of a device using the lens unit according to any one of the exemplary embodiments.

[0021] Fig.15 is a perspective view of a lens unit according to a fourth exemplary embodiment.

[0022] Fig.16 is a top view of the first lens.

[0023] Fig.17 is a top view of the second lens.

[0024] Fig.18is a top view of the third lens. DETAILED DESCRIPTION

[0025] Below, some exemplary embodiments of the present invention are described with reference to the accompanying drawings. Note that the form described below is an exemplary embodiment of the present invention and is not limited thereto. Common components are described by cross-referencing multiple figures, and the description of components represented by common reference numerals is appropriately omitted. Different items with the same name can be distinguished from each other by assigning ordinal numbers such as the first item, the second item, etc.

[0026] refer to Figures 1 to 3 A lens unit 100 according to a first exemplary embodiment is described. Figure 1 is a perspective view of the lens unit 100 . Figure 2 is a top view of the lens unit 100 . Figure 3 It is along Figure 2 2 is a cross-sectional view of the lens unit 100 taken along line AA in FIG. The lens unit 100 is assembled by superimposing a lens 1 (first lens), a lens 2 (second lens), and a lens 3 (third lens) disposed on the opposite side of the lens 2 from the lens 1 .

[0027] The lens 1 is disposed on the object side, and the lens 3 is disposed on the imaging device 10 side. The lens unit 100 is not necessarily a lens unit in which three lenses are assembled, and may be a lens unit in which two or more lenses are superimposed.

[0028] In a resin lens manufactured by injection molding, in particular, by injection molding of a resin, astigmatism based on a gate direction, which is an inlet for allowing resin to flow from an injection molding machine into a mold, may occur. In the case where a plurality of lenses each having astigmatism based on a gate direction are assembled, the lenses are stacked and assembled in a lens orthogonal direction, which makes it possible to eliminate astigmatism as a whole of the lens unit and enhance optical performance.

[0029] like Figure 3 , the lens 1 includes a surface 1a on the object side and a surface 1b on the imaging device 10 side. The lens 2 includes a surface 2a on the object side and a surface 2b on the imaging device 10 side. Likewise, the lens 3 includes a surface 3a on the object side and a surface 3b on the imaging device 10 side. Each of the lens 1 and the lens 3 is, for example, a lens whose thickness at the center is smaller than that at the periphery (flange portion), and the lens 2 is, for example, a lens whose thickness at the center is larger than that at the periphery.

[0030] Next, refer to Figures 4 to 6 Lens 1, lens 2, and lens 3 are described in detail. Figure 4 is the top view of lens 1, Figure 5 is a top view of lens 2, and Figure 6is a top view of lens 3. Lens 1, lens 2, and lens 3 include gate 6, gate 7, and gate 8, respectively, at positions where portions of the gate used in injection molding are chamfered. The gates of vertically adjacent lenses assembled into lens unit 100 are disposed at positions offset 90 degrees around optical axis C0. The gate of the lens is an inlet for filling the mold with resin in order to mold the resin lens by injection molding. A portion of the gate may be cut or polished after molding of the lens. According to the present exemplary embodiment, such a portion is also referred to as a gate (gate position).

[0031] A plurality of protrusions 4 are disposed on the surface 1b of the lens 1. Figure 4 , three protrusions 4 are illustrated; however, the number of protrusions 4 may be one or two or more. In the case where a plurality of protrusions 4 are provided, the plurality of protrusions 4 are disposed on a circle centered on the optical axis C0. The angle formed by two adjacent line segments each connecting one of the protrusions 4 to the optical axis C0 preferably has a value obtained by dividing 360 degrees by the number of protrusions 4. However, the angle does not need to have a value obtained by exactly dividing 360 degrees by the number of protrusions 4, and may preferably have a value within a range of ±10 degrees thereof. The protrusions 4 are preferably disposed near the periphery of the lens 1. More specifically, the protrusions 4 are preferably disposed on the peripheral side of the lens 1 relative to the midpoint between the optical axis C0 and the periphery of the lens 1. In particular, as Figure 4 As illustrated in FIG. 1 , the protrusion 4 is preferably disposed on a flange portion of the lens 1 .

[0032] A plurality of grooves 5 are disposed on the surface 2a of the lens 1. Figure 5 , a case where 12 grooves 5 are deployed is illustrated; however, it is sufficient that the number of grooves 5 is at least greater than the number of protrusions 4. In particular, the number of grooves 5 is preferably an integer multiple of the number of protrusions 4. Each of the protrusions 4 preferably has a spherical surface, but may have a conical shape, a square pyramid shape, or the like. Each of the grooves 5 has a shape to be fitted with each of the protrusions 4, and is preferably, for example, a V-shaped groove, but may be a U-shaped groove or a rectangular groove. As illustrated in the figure, the surface shapes of the protrusions 4 and the grooves 5 may be different from each other. By fitting the protrusions 4 into the grooves 5, the lens 1 and the lens 2 can be positioned. In addition, since the number of grooves 5 in the lens 2 is greater than the number of protrusions 4, the degree of freedom in positioning the lens 1 and the lens 2 is improved, and the positioning accuracy can be improved. The number of options for positioning the lens 1 and the lens 2 is equal to the number of grooves 5. Therefore, in Figure 5 In the case shown in the figure, the number of positioning options is 12.

[0033] In the lens unit 100 according to the present exemplary embodiment, the number of grooves 5 is greater than the number of protrusions 4. Therefore, in the positioning of the lens 1 and the lens 2, there are grooves 5 in which the protrusions 4 are fitted and grooves 5 in which no protrusions 4 are fitted. By changing the grooves 5 in which the protrusions 4 are fitted and the grooves 5 in which no protrusions 4 are fitted, desired positioning can be performed.

[0034] A plurality of grooves 5 are disposed on a circle centered on the optical axis C0. The convex portion 4 is preferably disposed on the same circle. In addition, the angle formed by two adjacent line segments each connecting one of the grooves 5 to the optical axis C0 preferably has a value obtained by dividing 360 degrees by the number of grooves 5. However, the angle does not need to have a value obtained by precisely dividing 360 degrees by the number of grooves 5, and may preferably have a value within a range of ±10 degrees thereof.

[0035] The groove 5 is preferably disposed near the outer periphery of the lens 2. More specifically, the groove 5 is preferably disposed on the outer periphery side of the lens 2 with respect to the midpoint between the optical axis C0 and the outer periphery of the lens 2.

[0036] In particular, if Figure 5 As shown in FIG. 2 , the groove 5 is preferably provided on the flange portion of the lens 2 .

[0037] A plurality of convex portions 40 (second convex portions) are disposed on the surface 2b of the lens 2. Figure 5 , three protrusions 40 are illustrated; however, the number of the protrusions 40 may be one or two or more. In the case where a plurality of protrusions 40 are provided, the plurality of protrusions 40 are disposed on a circle centered on the optical axis C0. In addition, the angle formed by two adjacent line segments each connecting one of the protrusions 40 with the optical axis C0 preferably has a value obtained by dividing 360 degrees by the number of protrusions 40. However, the angle does not need to have a value obtained by precisely dividing 360 degrees by the number of protrusions 40, and may preferably have a value within a range of ±10 degrees thereof. The protrusions 40 are preferably disposed near the periphery of the lens 2. More specifically, the protrusions 40 are preferably disposed on the peripheral side of the lens 2 relative to the midpoint between the optical axis C0 and the periphery of the lens 2. In particular, as Figure 5 As illustrated in FIG. 2 , the protrusion 40 is preferably disposed on a flange portion of the lens 2 .

[0038] A plurality of grooves 50 (second recessed portions) are disposed on the surface 3a of the lens 3. Figure 6, 12 grooves 50 are shown; however, it is sufficient that the number of grooves 50 is at least greater than the number of protrusions 40. In particular, the number of grooves 50 is preferably an integer multiple of the number of protrusions 40. Each of the grooves 50 has a shape into which each of the protrusions 40 is fitted, and is preferably, for example, a V-shaped groove, but may be a U-shaped groove or a rectangular groove. By fitting the protrusion 40 into the groove 50, the lens 2 and the lens 3 can be positioned. In addition, since the number of grooves 50 in the lens 3 is greater than the number of protrusions 40, the degree of freedom in positioning the lens 2 and the lens 3 is improved, and the positioning accuracy can be improved. The number of options for positioning the lens 2 and the lens 3 is equal to the number of grooves 50. Therefore, in Figure 6 In the case shown in the figure, the number of positioning options is 12.

[0039] In the lens unit 100 according to the present exemplary embodiment, the number of the grooves 50 is greater than the number of the convex portions 40. Therefore, in the positioning of the lens 2 and the lens 3, there are grooves 50 in which the convex portions 40 are fitted and grooves 50 in which the convex portions 40 are not fitted. By changing the grooves 50 in which the convex portions 40 are fitted and the grooves 50 in which the convex portions 40 are not fitted, desired positioning can be performed.

[0040] A plurality of grooves 50 are disposed on a circle centered on the optical axis C0. The convex portion 40 is preferably disposed on the same circle. In addition, the angle formed by two adjacent line segments each connecting one of the grooves 50 to the optical axis C0 preferably has a value obtained by dividing 360 degrees by the number of grooves 50. However, the angle does not need to have a value obtained by precisely dividing 360 degrees by the number of grooves 50, and may preferably have a value within a range of ±10 degrees thereof.

[0041] The groove 50 is preferably disposed near the periphery of the lens 3. More specifically, the groove 50 is preferably disposed on the periphery side of the lens 3 relative to the midpoint between the optical axis C0 and the periphery of the lens 3. In particular, as Figure 6 As illustrated in FIG. 8 , the groove 50 is preferably disposed on a flange portion of the lens 3 .

[0042] like Figure 5 As shown in FIG. 1 , in the lens 2, the gate 7 is disposed at a position having the same phase as one of the grooves 5 in the rotation direction around the optical axis C0, that is, disposed at a position consistent with the position of one of the grooves 5 in the optical axis direction. Figure 6As shown in the figure, in the lens 3, the gate 8 is disposed at a position of the phase between the grooves 50 in the rotation direction around the optical axis C0, that is, disposed at a position inconsistent with the position of any one of the grooves 50 in the optical axis direction. In other words, the groove 5 of the lens 2 and the groove 50 of the lens 3, which are vertically superimposed, are disposed at different positions (phases) in the rotation direction around the optical axis C0.

[0043] In the lens 3 in which the thickness at the center is smaller than the thickness at the periphery, the flow resistance of the resin flowing from the gate 8 toward the center of the lens increases. The flow of the resin at the center of the lens is lower than the flow of the resin at the periphery, the pressure distribution in the pressure holding process increases, and astigmatism occurs. When the gate 8 is disposed at the position of the phase between the grooves 50 as in the lens 3, the resin can be preferentially flowed toward the center of the lens, and the occurrence of astigmatism can be reduced.

[0044] In the lens 2 in which the thickness at the center is greater than the thickness at the periphery, the flow resistance of the resin flowing from the gate 7 toward the center of the lens is reduced. The flow of the resin at the center of the lens is higher than the flow of the resin at the periphery, and astigmatism occurs. When the gate 7 is disposed at a position with the same phase as one of the grooves 5 as in the lens 2, the resin resistance toward the center of the lens can be increased and the astigmatism that occurs can be reduced.

[0045] In the present exemplary embodiment, the lens unit 100 in which the lens 1, the lens 2, and the lens 3 are stacked is described; however, the lens unit 100 may include only the lens 1 and the lens 2. Alternatively, the lens unit 100 may include the lens 2 and the lens 3 stacked on each other. The lens unit 100 may include any lenses stacked on each other.

[0046] As described above, in the lens unit 100 , the convex portions and the concave portions whose number is greater than the number of the convex portions are disposed on the surfaces of the lenses facing each other, which makes it possible to improve the positioning accuracy.

[0047] refer to Figure 7 A lens unit 100 according to a second exemplary embodiment is described. Figure 7 is a top view of a lens unit 100 according to the second exemplary embodiment.

[0048] The lens unit 100 according to the present exemplary embodiment is different from the lens unit 100 according to the first exemplary embodiment in that the assembly angle is changed. More specifically, the gate 7 of the lens 2 is disposed at a position rotated 60 degrees from the gate 6 of the lens 1 in the rotation direction around the optical axis C0. In addition, the gate 8 of the lens 3 is disposed at a position rotated 120 degrees from the gate 7 of the lens 2 in the rotation direction around the optical axis C0.

[0049] In the case where astigmatism occurs in a direction different from the gate direction due to various factors in injection molding, using such an arrangement enables adjustment of the assembly rotation angle as in the present exemplary embodiment based on the direction of the astigmatism. Figure 8 When a lens is molded by multi-cavity molding with the cavity layout shown in the figure and the astigmatism direction changes according to each cavity, a combination of a cavity number and an assembly rotation angle for each lens can be defined, thereby facilitating management.

[0050] (Example)

[0051] Next, the present exemplary embodiment is described in more detail by using examples and comparative examples; however, the present exemplary embodiment is not limited to the following examples.

[0052] In this example, manufacturing Figures 1 to 6 The lens unit 100 shown in FIG. Figure 8 The lenses of the lens unit 100 are manufactured by resin molding using a multi-cavity mold shown in FIG.

[0053] Due to the influence of the phases of the gate 8 and the groove 50, the astigmatism of the surface 3a of the lens 3 is reduced.

[0054] The lens according to the example is stacked and assembled by a robot having an assembly angle adjustment capability of ±1.5 degrees. The variation of the optical axis rotation position of the lens is determined by the shape accuracy of the convex portion 40 and the concave groove 50, and the variation is ±1 degree or less.

[0055] (First Comparative Example)

[0056] Fig. 9 is a perspective view of a lens unit 100A in which three lenses (lens 1A, lens 2A, and lens 3A) according to a first comparative example are superimposed and assembled, Fig.10 is its top view, and Fig.11 It is along Fig.10 A cross-sectional view taken along line BB in FIG.

[0057] The lens unit 100A includes an imaging device 10A. The lens 1A is disposed on the object side, and the lens 3A is disposed on the imaging device 10A side.

[0058] The above assembly diagram focuses on a part of the process in the manufacturing process of the lens unit 100A, and omits accessory parts such as a lens barrel, a spacer, and an aperture. The contact shape of each of the lenses is different from that of each of the lenses according to the example.

[0059] A tapered shape 9A centered on the optical axis C1 is formed on the surface on the imaging device 10A side of the lens 1A. A tapered shape 9B centered on the optical axis C1 is formed on the surface on the object side of the lens 2A.

[0060] The tapered shape 9A and the tapered shape 9B are formed over the entire circumference of the lens unit 100A, and are configured to fit together. In other words, one convex portion 4A is formed on the lens 1A, and one concave portion 5A is formed on the lens 2A.

[0061] When the tapered shapes of lens 1A and lens 2A are in contact with each other, the relative positions of the lenses in the radial direction can be accurately managed, but the position accuracy in the rotational direction around the optical axis C1 depends on the assembly angle adjustment capability of the robot.

[0062] Likewise, when the tapered shapes of lens 2A and lens 3A contact each other, the relative positions of lens 2A and lens 3A in the radial direction can be accurately managed, but the position accuracy in the rotational direction around optical axis C1 depends on the assembly angle adjustment capability of the robot.

[0063] The lens according to the first comparative example was stacked and assembled by a robot having an assembly angle adjustment capability of ±1.5 degrees. The variation in the optical axis rotation position of the lens at this time was ±3 degrees, and the variation in assembly quality was large compared to the example.

[0064] (Second Comparative Example)

[0065] Fig.12 is a top view of a lens 2A according to a second comparative example, and Fig.13 is a top view of a lens 3A according to a second comparative example. In the second comparative example, unlike the example, the number of grooves 5A of the lens 2A is three, which is equal to the number of convex portions 4A of the lens 1A. Similarly, the number of grooves 50A of the lens 3A is three, which is equal to the number of convex portions 40A of the lens 2A. Other configurations are similar to those according to the example.

[0066] The lens according to the second comparative example is stacked and assembled by a robot having an assembly angle adjustment capability of ±1.5 degrees. The change in the optical axis rotation position of the lens at this time is ±1 degree or less, which is a good level. However, since three grooves 5A and three grooves 50A are provided, the number of possible options in the positioning of the lens unit 100A is three, and it is difficult to adjust the lens to a desired position.

[0067] In the example, since the number of the grooves 5 is greater than the number of the convex portions 4 , the lens can be positioned with high accuracy compared with the first and second comparative examples.

[0068] Next, as an example of an electronic device to which the lens unit 100 described in the first exemplary embodiment and the second exemplary embodiment can be mounted, refer to Fig.14 An imaging device 600 according to the third exemplary embodiment is described.

[0069] The imaging apparatus 600 includes a lens unit including three lenses (lens 1 , lens 2 , and lens 3 ), an imaging device 10 , an optical filter 11 , a holder 12 , and an external circuit 13 .

[0070] Three lenses (lens 1, lens 2, and lens 3) are superimposed and assembled. The lenses are arranged so that the lens 1 is disposed on the object side, and the lens 3 is disposed on the imaging device 10 side.

[0071] The imaging device 10 detects an object image formed by three lenses (lens 1 , lens 2 , and lens 3 ), converts the detected light into electric charges, and outputs the electric charges to the external circuit 13 .

[0072] The optical filter 11 is provided between the lens 3 and the imaging device 10. The optical filter 11 is, for example, an infrared cut filter, and has a function of reflecting infrared rays.

[0073] The holder 12 is a member for assembling and holding the three lenses (the lens 1 , the lens 2 , and the lens 3 ), the imaging device 10 , and the optical filter 11 .

[0074] A lens unit including three lenses is preferably housed and disposed inside the lens barrel, and an imaging device 10 that receives light having passed through the lens barrel is disposed in a housing connected to the lens barrel.

[0075] Next, a form of the lens unit 100 different from that according to the first exemplary embodiment is described. In the fourth exemplary embodiment, the difference from the first exemplary embodiment is mainly described, and description of similar contents is omitted.

[0076] The lens unit 100 according to the fourth exemplary embodiment is different from the lens unit 100 according to the first exemplary embodiment in the positions of the groove 5 of the lens 2 and the groove 50 of the lens 3 . Fig.15 is a perspective view illustrating an example of a lens unit 100 in which three lenses are assembled.

[0077] refer to Figures 16 to 18 Lens 1, lens 2, and lens 3 are described in detail. Fig.16 is the top view of lens 1, Fig.17 is a top view of lens 2, and Fig.18 is a top view of lens 3.

[0078] Lens 1, lens 2, and lens 3 include gates 6, 7, and 8, respectively, at positions where portions of the gates used in injection molding are chamfered. The gates of vertically adjacent lenses assembled into the lens unit 100 are arranged so as not to overlap each other in the rotational direction around the optical axis. More specifically, the gate positions can be adjusted by adjusting the positional relationship between the grooves and protrusions of the lenses vertically assembled into the lens unit.

[0079] exist Fig.15 In the example illustrated in , the concave and convex portions of the vertically assembled lenses are arranged to be shifted to positions rotated by at least 15 degrees or more around the optical axis C0.

[0080] A plurality of protrusions 4 are disposed on the surface 1b of the lens 1. Fig.16 , three convex portions 4 are illustrated; however, the number of convex portions 4 may be one or two or more. In the case where a plurality of convex portions 4 are provided, the plurality of convex portions 4 are disposed on a circle centered on the optical axis C0. The angle formed by two adjacent line segments each connecting one of the convex portions 4 to the optical axis C0 preferably has a value obtained by dividing 360 degrees by the number of convex portions 4. However, the angle does not need to have a value obtained by precisely dividing 360 degrees by the number of convex portions 4, and may preferably have a value within a range of ±10 degrees.

[0081] A plurality of grooves 5 are disposed on the surface 2a of the lens 2. Fig.17 , a case where 12 grooves 5 are provided is illustrated.

[0082] In the lens unit 100 according to the present exemplary embodiment, the number of grooves 5 is greater than the number of protrusions 4. Therefore, in the positioning of the lens 1 and the lens 2, there are grooves 5 in which the protrusions 4 are fitted and grooves 5 in which no protrusions 4 are fitted. By changing the grooves 5 in which the protrusions 4 are fitted and the grooves 5 in which no protrusions 4 are fitted, desired positioning can be performed.

[0083] In lens 1 and lens 2, protrusion 4 and groove 5 are arranged so that even when any one of protrusions 4 is fitted with any one of grooves 5, gate 6 of lens 1 and gate 7 of lens 2 do not overlap each other in the rotation direction around optical axis C0.

[0084] A plurality of convex portions 40 (second convex portions) are disposed on the surface 2b of the lens 2. Fig.17 , three convex portions 40 are illustrated; however, the number of the convex portions 40 may be one or two or more.

[0085] A plurality of grooves 50 (second recessed portions) are disposed on the surface 3a of the lens 3. Fig.18 In the figure, 12 grooves 50 are shown; however, it is sufficient that the number of grooves 50 is at least greater than the number of protrusions 40.

[0086] In the lens unit 100 according to the present exemplary embodiment, the number of the grooves 50 is greater than the number of the convex portions 40. Therefore, in the positioning of the lens 2 and the lens 3, there are grooves 50 in which the convex portions 40 are fitted and grooves 50 in which the convex portions 40 are not fitted. By changing the grooves 50 in which the convex portions 40 are fitted and the grooves 50 in which the convex portions 40 are not fitted, desired positioning can be performed.

[0087] In addition, in lens 2 and lens 3, the protrusion 40 and the groove 50 are arranged so that even when any one of the protrusions 40 is fitted with any one of the grooves 50, the gate 7 of lens 2 and the gate 8 of lens 3 do not overlap each other in the rotation direction around the optical axis C0.

[0088] As described above, gates of lenses vertically positioned when the lenses are assembled into the lens unit 100 are arranged not to overlap each other in the rotation direction around the optical axis C0 , thereby making it possible to reduce the influence of distortion occurring on each of the lenses due to injection molding.

[0089] In the case where more lenses are assembled as a lens unit, the positions of the gates may coincide with each other between some lenses, and it is sufficient that the gates are arranged not to overlap with each other between lenses subject to large distortion.

[0090] The above-described exemplary embodiments may be appropriately changed without departing from the technical idea.

[0091] For example, a plurality of exemplary embodiments may be combined. In addition, matters according to at least one of the exemplary embodiments may be partially deleted or replaced.

[0092] Furthermore, new matters may be added to at least one of the exemplary embodiments.The disclosure of this specification is not limited to matters explicitly described in this specification, and includes all matters that can be understood from this specification and the drawings attached to this specification.

[0093] The disclosure of this specification includes the complementary set of individual concepts described in this specification. For example, when there is a description of "A is greater than B" in this specification, even if the description of "A is not greater than B" is omitted, it can be said that this specification discloses the description of "A is not greater than B". This is because the description of "A is greater than B" is based on the assumption that the situation of "A is not greater than B" is considered.

[0094] While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims

1. A lens unit, comprising: First resin lens; and a second resin lens, the second resin lens being superimposed on the first resin lens, wherein the first resin lens includes a first convex portion on a surface facing the second resin lens, The second resin lens includes a first concave portion on a surface facing the first resin lens, and the first convex portion can be fitted into the first concave portion, and Even in a state where the first convex portion is fitted into any one of the first concave portions, the gate position of the first resin lens and the gate position of the second resin lens do not overlap each other in the rotation direction around the optical axis.

2. The lens unit according to claim 1, wherein: Even in a state where the first convex portion is fitted into any one of the first concave portions, the gate position of the second resin lens is a position rotated by 15 degrees or more from the gate position of the first resin lens in the rotation direction around the optical axis.

3. The lens unit according to claim 1, wherein: A plurality of first protrusions are provided.

4. The lens unit according to claim 1, wherein: The number of the first recessed parts is an integral multiple of the number of the first convex parts.

5. The lens unit according to claim 1, wherein: The surface shape of the first convex portion is different from the surface shape of the first concave portion.

6. The lens unit according to claim 1, wherein: The first convex portion has a spherical surface, and the first concave portion has a V-shape or a U-shape.

7. The lens unit according to claim 1, wherein: When a direction in which the first resin lens and the second resin lens are superimposed is defined as an axis, the first recess has a rectangular shape extending in a radial direction of the axis.

8. The lens unit according to claim 1, wherein: Three first recesses are provided.

9. The lens unit according to claim 1, wherein: The direction in which the first resin lens and the second resin lens are superimposed is the direction in which the optical axis of the lens unit extends.

10. The lens unit according to claim 1, in, The second resin lens is a lens in which the thickness at the center of the lens is greater than the thickness at the periphery of the lens, and Here, the gate position of the second resin lens is arranged so as not to coincide with any of the first recessed portions in the rotation direction around the optical axis of the lens unit.

11. The lens unit according to claim 1, further comprising a third resin lens superimposed on the second resin lens on an opposite side to the first resin lens, in, The second resin lens includes a second convex portion on a surface facing the third resin lens, and The third resin lens includes a second concave portion on a surface facing the second resin lens, and the second convex portion can be fitted into the second concave portion.

12. The lens unit according to claim 11, wherein: Even in a state where the first protrusion is fitted into any one of the first recesses and the second protrusion is fitted into any one of the second recesses, the gate position of the first resin lens, the gate position of the second resin lens, and the gate position of the third resin lens do not overlap with each other in the rotation direction around the optical axis.

13. The lens unit according to claim 12, wherein: Even in a state in which the first protrusion is fitted into any one of the first recesses and the second protrusion is fitted into any one of the second recesses, the gate position of the first resin lens, the gate position of the second resin lens, and the gate position of the third resin lens are at positions rotated more than 15 degrees from each other in the rotation direction around the optical axis.

14. The lens unit according to claim 12, wherein: The number of the first protrusions is equal to the number of the second protrusions.

15. The lens unit according to claim 11, in, The third resin lens is a lens in which the thickness at the center of the lens is smaller than the thickness at the periphery of the lens, and The gate position of the third resin lens is disposed at a position between the second recess and a recess adjacent to the second recess in a rotation direction around the optical axis of the lens unit.

16. A lens unit, comprising: First resin lens; a second resin lens, the second resin lens being superimposed on the first resin lens; and a third resin lens, the third resin lens being superimposed on the second resin lens on the opposite side to the first resin lens, wherein the first resin lens includes a first convex portion on a surface facing the second resin lens, The second resin lens includes a first concave portion on a surface facing the first resin lens, and the first convex portion can be fitted into the first concave portion. wherein the number of the first concave portions is greater than the number of the first convex portions, wherein the second resin lens includes a second convex portion on a surface facing the third resin lens, The third resin lens includes a second concave portion on a surface facing the second resin lens, and the second convex portion can be fitted into the second concave portion, and The number of the second concave portions is greater than the number of the second convex portions.

17. The lens unit according to claim 16, in, The second resin lens is a lens in which the thickness at the center of the lens is greater than the thickness at the periphery of the lens, wherein the gate position of the second resin lens is arranged to be inconsistent with the first recess in the rotation direction around the optical axis of the lens unit, wherein the third resin lens is a lens having a thickness at the center of the lens smaller than a thickness at the periphery of the lens, and The gate position of the third resin lens is disposed at a position between the second recess and a recess adjacent to the second recess in a rotation direction around the optical axis of the lens unit. 18 . A lens holder comprising the lens unit according to claim 1 .

19. An imaging device comprising: The lens holder according to claim 18; and An imaging device is configured to receive light that has passed through the lens holder.

20. The imaging device according to claim 19, wherein The imaging device is disposed inside the lens holder.

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