JP2006284789A - Lens barrel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel which can simplify its structure and prevent inclination and axial displacement of the lens with respect to the retainer cylinder without rattling, while making its assembly easy and simple, and is especially applicable with high precision and stability to cemented lenses which significantly affect the optical characteristics, and can secure high quality and production yield. <P>SOLUTION: In a lens barrel which has a lens 20 and a retainer cylinder 10, which defines the inner surface 11 with its axial center in the direction of the light axis L for retaining the lens, the lens 20 is fitted into the retainer cylinder 10, by making elastic deformations of the elastic stripes 14, formed projecting radially from the inner surface 11 of the retainer cylinder 10 and extending in the direction of the light axis L that is arranged circumferentially at equal spacing. Thus, the lens 20 is prevented from rattling, inclining, or displacing with respect to the retainer cylinder 10, while surely securing its centering and positioning, and firmly fixed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a lens barrel that is applied to an optical system such as a digital camera or a silver salt film camera, and more particularly to a lens barrel that is fixed by fitting a lens into a holding cylinder while aligning the lens.
About.

As a conventional lens barrel, in order to prevent the lens from rattling or shifting with respect to the holding cylinder due to variations in the dimensions of the lens and the holding cylinder (lens holder), a lens is provided on the inner peripheral surface of the holding cylinder. It is known that after heat is received, heat is applied from the outer periphery of the holding cylinder, the end of the holding cylinder is crimped, and the lens is fixed (for example, see Patent Document 1).
However, with this method, it is difficult to prevent lens tilting or axial misalignment with respect to the holding cylinder, even though it is possible to prevent lens rattling, and a dedicated device for performing heat caulking is required. This increases the manufacturing cost.

As another method for fixing the lens to the holding cylinder (lens frame), in a loupe composed of a lens and a holding cylinder (lens frame), a depression is formed at two locations on the inner peripheral surface of the holding cylinder, and one depression is formed. A plurality of ribs are provided on the lens, and protrusions that fit into the two recesses are provided on the lens.When the lens is assembled to the holding cylinder, the plurality of ribs are in close contact with the protrusions of the lens so that the lens is firmly attached to the holding cylinder. What is fixed is known (for example, refer to Patent Document 2).
However, with this method, even if the lens can be firmly fixed to the holding cylinder, it is difficult to prevent the lens from being tilted or misaligned with respect to the holding cylinder. There is no need to manage the accuracy with high accuracy.

JP 2001-511176 A JP 2004-53787 A

  The present invention has been made in view of the above circumstances, and its purpose is to simplify the structure, facilitate assembly, etc., while tilting the lens with respect to the holding cylinder, axial misalignment, and An object of the present invention is to provide a lens barrel that can prevent rattling and the like, and can be assembled with high accuracy and stability even in a cemented lens that has a particularly high degree of influence on optical performance, and can improve quality and yield.

The lens barrel of the present invention is a lens barrel including a lens and a holding cylinder that defines an inner peripheral surface having an axis in the optical axis direction so as to accommodate the lens, and the holding cylinder includes It has a plurality of elastically deformable protrusions that protrude radially inward from the inner peripheral surface, extend in the optical axis direction, and are arranged at equal intervals in the circumferential direction.
According to this configuration, when the lens is incorporated into the holding cylinder, the lens (the outer peripheral surface thereof) elastically deforms the plurality of protrusions arranged at equal intervals on the inner peripheral surface of the holding cylinder outward in the radial direction. As a result, the lens is tilted and offset with respect to the holding tube, and rattling is prevented, so that the lens is securely aligned and positioned, and at the same time, the lens is firmly fixed.
As a result, the lens barrel can be stably assembled, and the quality and yield can be improved.

The said structure WHEREIN: The structure currently formed with the resin material can be employ | adopted for the holding | maintenance cylinder so that a some protrusion part may be defined integrally.
According to this configuration, since the holding cylinder is formed of the resin material including the plurality of protrusions, the plurality of protrusions can be easily formed so as to be elastically deformable and formed separately. Compared to the case where the elastically deformable protrusion is retrofitted to the holding cylinder, the number of parts can be reduced and the manufacturing cost can be reduced.

In the above configuration, the outer diameter of the lens is φd ± Δd (where ± Δd is a tolerance), the inner diameter of the inner peripheral surface of the holding cylinder is φD ± ΔD (where ± ΔD is a tolerance), and the inscribed contact with the plurality of protrusions When the diameter of the circle is φD1 ± ΔD1 (where ± ΔD1 is a tolerance)
φD1 ± ΔD1 <φd ± Δd <φD ± ΔD
A configuration that satisfies the above can be adopted.
According to this configuration, the outer diameter of the lens is the minimum value φd−Δd to the maximum value φd + Δd, the inner diameter of the inner peripheral surface of the holding cylinder is the minimum value φD−ΔD to the maximum value φD + ΔD, and the inscribed contact with the plurality of protrusions Even if the diameter of the circle varies from the minimum value φD1−ΔD1 to the maximum value φD1 + ΔD1, the outer diameter φd ± Δd of the lens is always larger than the diameter φD1 ± ΔD1 of the inscribed circle contacting the plurality of protrusions. In addition, since the lens is formed so as to be always smaller than the inner diameter φD ± ΔD of the inner peripheral surface of the holding cylinder, the lens is securely fixed to the holding cylinder by being fitted while elastically deforming the plurality of protrusions.

In the above configuration, the lens includes a cemented lens including a front lens having a small diameter and a rear lens having a large diameter cemented to the front lens, and the holding cylinder includes a plurality of protrusions on the outer peripheral surface of the rear lens. It is possible to adopt a configuration that is retained.
According to this configuration, when the cemented lens including the small diameter lens and the large diameter lens is assembled to the holding cylinder, the outer peripheral surface of the large diameter lens is fitted while elastically deforming the plurality of protrusions, so that the assembly is easy. In addition, it is possible to reliably prevent tilting and axial misalignment of the cemented lens with respect to the holding cylinder, and to ensure high optical performance.

In the above configuration, the plurality of protrusions may be configured to be provided at a plurality of different locations in the optical axis direction so as to hold a plurality of lenses.
According to this configuration, it is possible to arrange not only a single lens or a cemented lens but also a plurality of lenses with respect to the holding cylinder in the optical axis direction while preventing tilting and axial misalignment, and assembling with high accuracy and firmness. it can.

The said structure can employ | adopt the structure that the some protrusion part is formed so that a some lens can be fitted from both sides of an optical axis direction.
According to this configuration, the plurality of lenses can be arranged in the optical axis direction from the front and rear of the holding cylinder and can be assembled with high accuracy and firmly.

The said structure can employ | adopt the structure which is formed in multiple steps | paragraphs so that the some protrusion part can fit the some lens from which an outer diameter differs from the one side of an optical axis direction.
According to this configuration, a plurality of lenses having different outer diameters are arranged in the optical axis direction from one side of the holding cylinder in the optical axis direction (from the front or the rear of the holding cylinder) with high accuracy and Can be firmly assembled.

  According to the lens barrel having the above-described configuration, when the lens is assembled to the holding cylinder while achieving simplification of the structure and ease of assembling, the lens is inclined with respect to the holding cylinder, the shaft is offset, and rattling is also performed. In particular, when assembling a cemented lens having a high influence on optical performance, highly accurate and stable assembly is possible. Therefore, in the manufacture of the lens barrel, it is possible to achieve an improvement in quality and an improvement in yield.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.
1 to 3 show an embodiment of a lens barrel according to the present invention. FIG. 1 is a rear view and a sectional view of the lens barrel. FIG. 2 is a sectional view showing a relationship between a holding cylinder and a lens. FIGS. 3A and 3B are a rear view and a partially enlarged view showing a state of the protruding portion in a state where the lens is fitted to the holding cylinder.

As shown in FIGS. 1 and 2, this lens barrel is formed by a cylindrical holding cylinder 10 and a lens 20 held by the holding cylinder 10.
The holding cylinder 10 is integrally formed in a substantially cylindrical shape by an elastically deformable resin material. As shown in FIGS. 1 and 2, the holding cylinder 10 has a center in the optical axis direction L and accommodates the lens 20. An inner peripheral surface 11 defining an outer periphery, an outer peripheral surface 12 forming an outer contour, an annular stepped portion 13 defining an opening 13a having a predetermined diameter on the inner peripheral surface 11, and an inner peripheral surface 11 arranged at equal intervals in the circumferential direction. A plurality of (in this case, four) projecting ridges 14, an arm 15 that protrudes radially outward from the outer peripheral surface 12, and holds a follower pin (not shown) at the tip are provided. The lens barrel is supported by a cam barrel or the like via a follower pin provided on the arm portion 15 so as to be movable in the optical axis direction.

  The four ridges 14 protrude radially inward from the inner peripheral surface 11 and extend in the optical axis direction L, and are arranged at equal intervals of 90 degrees in the circumferential direction. It can be elastically deformed. Thus, since the four protrusions 14 are arranged at equal intervals in the circumferential direction, when the lens 20 is fitted, a holding force acts equally on the lens 20 from the circumferential direction, Alignment can be performed while preventing the lens 20 from tilting, misaligning, rattling or the like. Further, the four protrusions 14 may be formed as separate bodies and retrofitted as long as they can be elastically deformed. However, since the four protrusions 14 are integrally formed of a resin material with respect to the holding cylinder 10, A plurality of strips 14 can be easily formed, and the number of parts can be reduced and the manufacturing cost can be reduced as compared with the case of separate bodies.

  Further, regarding the relationship between the four protrusions 14 and the inner peripheral surface 11, as shown in FIG. 2, the inner diameter of the inner peripheral surface 11 is φD ± ΔD in consideration of manufacturing dimensional tolerance ± ΔD 1. The four protrusions 14 are formed so that the diameters of the inscribed circles in contact therewith are φD1 ± ΔD1 (where φD1 ± ΔD1 <φD ±) in consideration of the manufacturing dimensional tolerance ± ΔD1. The tip is curved in a semicircular cross section so that ΔD).

The lens 20 is formed of a resin material or a glass material, and is formed as a cemented lens of a front lens 21 having a small diameter and a rear lens 22 having a large diameter, as shown in FIGS.
The front lens 21 is a biconvex lens with both surfaces formed in a convex shape, and the rear lens 22 is a biconcave lens with both surfaces formed in a concave shape.
As shown in FIG. 2, the outer diameter of the rear lens 22 is formed to be φd ± Δd in consideration of the manufacturing dimensional tolerance ± Δd.

Further, the holding cylinder 10 and the lens 20 include an outer diameter φd ± Δd (where ± Δd is a tolerance) of the lens 20 (rear lens 22), and an inner diameter φD ± ΔD (where ± ΔD) of the inner peripheral surface 11 of the holding cylinder 10. Is a tolerance), and the mutual relationship of the diameters φD1 ± ΔD1 (where ± ΔD1 is a tolerance) of the inscribed circle that contacts the plurality of protrusions 14 is
φD1 ± ΔD1 <φd ± Δd <φD ± ΔD
It is formed to satisfy.

  According to this, the outer diameter of the lens 20 (rear lens 22) is the minimum value φd−Δd to the maximum value φd + Δd, and the inner diameter of the inner peripheral surface 11 of the holding cylinder 10 is the minimum value φD−ΔD to the maximum value φD + ΔD. The lens 20 (rear lens 22) always compresses the plurality of protrusions 14 even if the diameter of the inscribed circle that contacts the protrusions 14 varies between the minimum value φD1−ΔD1 and the maximum value φD1 + ΔD1. It is fitted while being elastically deformed, and is securely fixed to the holding cylinder 10 in a non-contact state with the inner peripheral surface 11.

  That is, when the outer diameter of the lens 20 (rear lens 22) is φd−Δd, the inner diameter of the inner peripheral surface is φD + ΔD, and the diameter of the inscribed circle of the protrusion 14 is φD1 + ΔD1, the elastic deformation due to compression of the protrusion 14 is caused. Although the amount is the smallest, as shown in FIG. 3A, the lens 20 (rear lens 22) is held with a predetermined fitting force without causing inclination, axial deviation, or rattling with respect to the holding cylinder 10. And fixed securely. Further, when the outer diameter of the lens 20 (rear lens 22) is φd + Δd, the inner diameter of the inner peripheral surface 11 is φD−ΔD, and the diameter of the inscribed circle of the protruding portion 14 is φD1-ΔD1, the compression of the protruding portion 14 is performed. As shown in FIG. 3B, the lens 20 (rear lens 22) has a stronger fitting force without causing inclination, axial deviation, or rattling with respect to the holding cylinder 10, as shown in FIG. It is held by and fixed securely.

According to this embodiment, when the lens barrel is assembled, the rear lens is moved until the lens 20 is brought close to the inner peripheral surface 11 from the rear of the holding tube 10 and the front lens 21 is positioned in contact with the annular step portion 13. Assembling can be easily performed by fitting the outer peripheral surface 22 so that the four protrusions 14 are compressed and elastically deformed.
In addition, it is possible to prevent the inclination and axial deviation of the optical axis of the lens 20 with respect to the axial center (optical axis direction L) of the holding cylinder 10, and rattling of the lens 20, and the cemented lens 20 having a particularly high degree of influence on optical performance. Can be stably assembled with high accuracy, and in the manufacture of the lens barrel, improvement in quality and improvement in yield can be achieved.

4 (a) and 4 (b) show another embodiment of the lens barrel according to the present invention. The same components as those of the above-mentioned embodiment are denoted by the same reference numerals and the description thereof is omitted. To do.
In this embodiment, twelve protrusions 14 are integrally formed on the inner peripheral surface 11 of the holding cylinder 10 ′.
That is, the twelve ridges 14 are formed at equal intervals of 30 degrees in the circumferential direction of the inner peripheral surface 11. Therefore, the alignment operation is performed with higher accuracy by the increase in the number of the protrusions 14 that are in contact with the outer peripheral surface of the lens 20 (rear lens 22), and the tilt and the axial deviation are prevented. The resultant force is further increased to prevent rattling and the like, and is more firmly fixed. As a result, the lens barrel can be stably assembled, and the quality and yield can be improved.

5 (a) and 5 (b) show still another embodiment of the lens barrel according to the present invention. The same components as those of the above-described embodiment are denoted by the same reference numerals and the description thereof will be given. Omitted.
In this embodiment, four protrusions 14 ′ are integrally formed on the inner peripheral surface 11 of the holding cylinder 10 ″.
The four ridges 14 ′ are formed so that the tip of the lens 20 (rear lens 22) that is in contact with the outer peripheral surface is formed in a flat surface rather than a semicircular shape, and substantially in the inner peripheral surface 11. It has a protruding shape.
In this case as well, as described above, the centering action of the lens 20 is performed with higher accuracy, the tilt and axial deviation of the lens 20 are prevented, the fitting force is further increased, and rattling is prevented, thereby making it more robust. It will be fixed. As a result, the lens barrel can be stably assembled, and the quality and yield can be improved.

6 (a), 6 (b), and 6 (c) show still another embodiment of the lens barrel according to the present invention. The same reference numerals are given to the same components as those in the previous embodiment. The description is omitted.
In this embodiment, the holding cylinder 110 is integrally formed in a substantially cylindrical shape by an elastically deformable resin material, and as shown in FIGS. 6 (a), 6 (b), and 6 (c), an annular step portion. 13, at different positions in the optical axis direction L, the inner peripheral surface 11 and the plurality (four pieces) of protrusions 14 that accommodate the lens 20 in the rear, and the inner peripheral surface 11 and the plurality (and plural) that accommodate the lens 120 in the front. 4) ridges 14 are provided.
The lens 120 is a biconvex lens having both surfaces formed in a convex shape by a resin material or a glass material.
The relationship between the inner diameter φD ± ΔD of the inner peripheral surface 11 in front of the holding cylinder 110, the diameter φD1 ± ΔD1 of the inscribed circle of the protrusion 14 and the outer diameter φd ± Δd of the lens 120 is the same as that of the above-described embodiment. It is the same.

According to this embodiment, when the lens barrel is assembled, the lens 20 is brought close to the inner peripheral surface 11 from the rear of the holding cylinder 10, and the outer peripheral surface of the rear lens 22 compresses the four protrusions 14 to be elastic. The lens 120 is fitted so that it is deformed, and the outer peripheral surface of the lens 120 is 4 until the lens 120 is positioned close to the inner peripheral surface 11 from the front of the holding cylinder 10 and contacted with the annular step portion 13. The lenses 20 and 120 can be easily assembled to the holding cylinder 110 by fitting the protrusions 14 so as to be compressed and elastically deformed.
In addition, it is possible to prevent tilting and axial deviation of the optical axes of the lenses 20 and 120 with respect to the axis of the holding cylinder 110 (optical axis direction L), and rattling of the lenses 20 and 120, and to assemble stably with high accuracy. In the production of the lens barrel, it is possible to improve the quality and the yield.

FIG. 7A shows still another embodiment of the lens barrel according to the present invention. The same reference numerals are given to the same components as those of the above-described embodiment, and the description thereof is omitted.
In this embodiment, the holding cylinder 10 accommodates and holds two lenses 120 having the same outer diameter.
That is, when the lens barrel is assembled, the four protrusions 14 are compressed on the outer peripheral surface by approaching the inner peripheral surface 11 from the rear of the holding cylinder 10 until one lens 120 contacts the annular stepped portion 13. Next, the spacer 200 is brought close to the inner peripheral surface 11 from the rear side of the holding cylinder 10 until one end of the spacer 200 comes into contact with one of the lenses 120, and four protruding portions are formed on the outer peripheral surface. 14 is compressed and elastically deformed, and the other lens 120 is brought close to the inner peripheral surface 11 from the rear side of the holding cylinder 10 until the other lens 120 comes into contact with the other end portion of the spacer 200, and four lenses are formed on the outer peripheral surface. The protrusions 14 are fitted and compressed while being elastically deformed.

  Thereby, the two lenses 120 positioned by the annular step portion 13 and the two end portions of the spacer 200 in the optical axis direction L can be easily assembled to the holding cylinder 10. The tilt and misalignment of the optical axes of the two lenses 120 with respect to the axis (optical axis direction L) can be prevented, and rattling of the two lenses 120 can be prevented. In the production of the lens barrel, the quality is improved and the yield is improved. Can be achieved.

FIG. 7B shows still another embodiment of the lens barrel according to the present invention. The same reference numerals are given to the same components as those of the above-described embodiment, and the description thereof is omitted.
In this embodiment, the holding cylinder 210 accommodates and holds two lenses 120 and 120 ′ having different outer diameters.
The holding cylinder 210 is formed in a substantially cylindrical shape by an elastically deformable resin material, and has four large protrusions provided on the large-diameter inner peripheral surface 11, the small-diameter inner peripheral surface 11 ″, and the inner peripheral surface 11. 14 and four projecting portions 14 ″ provided on the inner peripheral surface 11 ″ are integrally provided.
The relationship between the inner diameter φD ± ΔD of the inner peripheral surface 11 ″ of the holding cylinder 210, the diameter φD1 ± ΔD1 of the inscribed circle of the protruding portion 14 ″, and the outer diameter φd ± Δd of the lens 120 ′ is as described above. This is the same as the embodiment.
The lenses 120 and 120 ′ are biconvex lenses formed on both surfaces in a convex shape by a resin material or a glass material. The lens 120 has a large diameter and the lens 120 ′ has a small diameter.

That is, the plurality of protrusions 14 and 14 ″ are formed in multiple stages so that the two lenses 120 and 120 ′ having different outer diameters can be fitted from the rear (one side) in the optical axis direction L.
When assembling the lens barrel, the small lens 120 ′ is brought into contact with the annular stepped portion 13 and positioned so as to approach the inner peripheral surface 11 ″ from the rear of the holding cylinder 210 and four protrusions on the outer peripheral surface thereof. The portion 14 ″ is compressed and elastically deformed to be fitted, and then the large diameter lens 120 is contacted with the rear end edge of the inner peripheral surface 11 ″ and positioned from the rear side of the holding cylinder 210 until it is positioned. The four ridges 14 are compressed and elastically deformed by being brought close to the peripheral surface 11 and elastically deformed on the peripheral surface thereof.

  Thereby, the two lenses 120 and 120 ′ having different outer diameters can be easily assembled by being arranged in the optical axis direction L with respect to the holding cylinder 210, and the axis of the holding cylinder 210 (optical axis direction L). The two lenses 120 and 120 ′ can be assembled with high accuracy by preventing the inclination and misalignment of the optical axes of the two lenses 120 and 120 ′, and can be firmly assembled by preventing the backlash and the like of the two lenses 120 and 120 ′. Therefore, in the manufacture of the lens barrel, it is possible to achieve an improvement in quality and an improvement in yield.

  In the above embodiment, when the present invention is applied to a lens barrel that is applied to a digital camera or a silver halide film camera and is supported so as to be movable in the optical axis direction, that is, a holding cylinder holds a follower pin. However, the present invention is not limited to this, and the present invention may be adopted in a lens barrel fixed in the optical axis direction.

  In the above embodiment, as a case where a plurality of protrusions are provided at a plurality of different locations in the optical axis direction, as shown in FIG. 6 or FIG. However, the present invention is not limited to this, and may be provided at three or more different locations.

  Moreover, in the said embodiment, although the case where the some protrusion-like part 14, 14 ', 14' 'was integrally formed with respect to the holding cylinders 10, 10' ', 210 was shown, it is limited to this. Instead of this, a configuration may be adopted in which a protruding portion that is previously formed separately from an elastically deformable material is retrofitted onto the inner peripheral surface of the holding cylinder.

  As described above, the lens barrel of the present invention achieves simplified structure, easy assembly, etc., and can prevent lens tilt, axial deviation, rattling, etc. with respect to the holding cylinder, and is highly accurate. Therefore, it can be applied as a lens barrel of a digital camera or a silver salt film camera, and is also useful as a lens barrel of other optical systems.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a lens barrel according to the present invention, wherein (a) is a rear view showing a state where a lens is assembled to a holding cylinder, and (b) is a cross-sectional view showing a state where a lens is assembled to a holding cylinder. It is. It is sectional drawing which shows the relationship between the holding | maintenance cylinder and lens which comprise the lens barrel shown in FIG. (A), (b) is the rear view and partial enlarged view which show the relationship between a some protrusion part and the lens in the state in which the lens was fitted to the holding cylinder. FIG. 5 shows another embodiment of a holding cylinder forming a part of a lens barrel according to the present invention, in which (a) is a perspective view and (b) is a rear view. FIG. 9 shows still another embodiment of a holding cylinder forming a part of a lens barrel according to the present invention, in which (a) is a perspective view and (b) is a rear view. FIG. 5 shows still another embodiment of the lens barrel according to the present invention, wherein (a) is a front view showing a state in which the lens is assembled to the holding cylinder, and (b) shows a state in which the lens is assembled to the holding cylinder. Sectional drawing, (c) is a rear view showing a state in which a lens is assembled to a holding cylinder. (A), (b) is sectional drawing which each shows further another embodiment of the lens barrel which concerns on this invention.

Explanation of symbols

L Optical axis direction 10, 10 ′, 10 ″, 110, 210 Holding cylinder 11, 11 ′, 11 ″ Inner peripheral surface 12 Outer peripheral surface 13 Annular step portion 13a Opening portions 14, 14 ′, 14 ″ Multiple protrusions Shape part 15 Arm part 20 Lens (Bonded lens)
21 Front lens 22 Rear lens 120, 120 ′ lens

Claims (7)

A lens barrel comprising: a lens; and a holding cylinder that defines an inner peripheral surface having an axial center in the optical axis direction to accommodate the lens,
The holding cylinder has a plurality of elastically deformable protrusions that protrude radially inward from the inner peripheral surface and extend in the optical axis direction and are arranged at equal intervals in the circumferential direction.
A lens barrel characterized by that. The holding cylinder is formed of a resin material so as to integrally define the plurality of protrusions.
The lens barrel according to claim 1. The outer diameter of the lens is φd ± Δd (where ± Δd is a tolerance), the inner diameter of the inner peripheral surface of the holding cylinder is φD ± ΔD (where ± ΔD is a tolerance), and an inscribed circle that contacts the plurality of protrusions When the diameter is φD1 ± ΔD1 (where ± ΔD1 is a tolerance)
φD1 ± ΔD1 <φd ± Δd <φD ± ΔD
The lens barrel according to claim 1, wherein the lens barrel is satisfied. The lens includes a cemented lens including a front lens having a small diameter and a rear lens having a large diameter cemented to the front lens.
The holding cylinder holds the outer peripheral surface of the rear lens with the plurality of protrusions,
The lens barrel according to claim 1, wherein the lens barrel is provided. The plurality of protrusions are provided at a plurality of different locations in the optical axis direction to hold a plurality of lenses.
The lens barrel according to any one of claims 1 to 4, wherein the lens barrel is provided. The plurality of protrusions are formed so that a plurality of lenses can be fitted from both sides in the optical axis direction.
The lens barrel according to claim 5. The plurality of protrusions are formed in multiple stages so that a plurality of lenses having different outer diameters can be fitted from one side in the optical axis direction.
The lens barrel according to claim 5 or 6, wherein the lens barrel is provided.

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