JP2016051076A - Barrel and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a simple structure, reduction in the number of components, easy assembling work, low cost, easy optical axis alignment, and improvement in shock resistance in a barrel.SOLUTION: A barrel includes a first cylindrical member 10 holding an optical element and a second cylindrical member 20 with which the edge 16 of the first cylindrical member is made to couple and that holds the optical element. The first cylindrical member 10 includes a projection 18 projecting from the outer periphery of the edge in a radial direction. The second cylindrical member 20 includes fitting recesses 21 (an annular recess 22, a widening recess 23) into which the edge 16 and the projection 18 of the first cylindrical member are fitted and an adhesive material Gr is filled. The above configuration allows a simple structure, reduction in the number of components, easy assembling work, low cost, easy optical axis alignment, and improvement in shock resistance to be achieved.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a lens barrel having a plurality of lenses and an imaging apparatus equipped with the lens barrel, and more particularly to a lens barrel used in an imaging apparatus such as a digital camera, an in-vehicle camera, a surveillance camera, and a portable information terminal. And an imaging apparatus.

As a conventional lens barrel and image pickup device, a plurality of lenses are arranged and held, and a first cylinder member (lens holder) having a male screw portion formed on the outer periphery, and a male screw portion of the first cylinder member are screwed together A second cylinder member (base) or the like that has an internal thread portion that holds an optical filter (optical element) and that can be attached with an image sensor, and the external thread portion of the first cylinder member is an internal thread portion of the second cylinder member A lens barrel that can be adjusted in the direction of the optical axis by adjusting the screwing amount as appropriate, and a substrate on which an imaging element is mounted on the second cylindrical member (base) of the lens barrel There is known an imaging apparatus having a configuration in which the above is assembled (see, for example, Patent Document 1).
However, in the lens barrel described above, the configuration is such that both are assembled by simply screwing the male threaded portion of the first cylindrical member with the female threaded portion of the second cylindrical member, and therefore the adjustment in the optical axis direction is possible. At the same time, there is no risk that the first cylinder member will fall off the second cylinder member due to external impact or the like, but the structure is complicated due to the provision of the male screw portion and the female screw portion, and the male screw portion and the female screw portion. There are dimensional manufacturing errors (variations), backlash, and other gaps and backlashes between the lens and the optical axis of the lens held by the first cylinder member when the first cylinder member is assembled to the second cylinder member. And the optical axis of the optical element held by the second cylinder member are not easily matched, and the central axis of the first cylinder member with respect to the central axis of the second cylinder member (a vertical line passing through the center of the image sensor) (Ie, the optical axis of the lens) is deviated or tilted There is a risk caused collapse optical axis (inclination of the optical axis).

In addition, as another lens barrel and an imaging device, a first cylinder member (front barrel) in which a plurality of lenses are arranged and held and a positioning recess is formed at the rear end, and a positioning recess of the first cylinder member A second cylindrical member (rear barrel) that has a support projection fitted into the first lens and holds a plurality of lenses and can be attached to an imaging device; a cover member that connects and fixes the first cylindrical member and the second cylindrical member; A lens in which a support projection of the second cylinder member is fitted into the positioning recess of the first cylinder member to join them together, and then both are fixed by a cover member extending from the first cylinder member to the second cylinder member. There is known an imaging apparatus having a configuration in which a lens barrel and a substrate on which an imaging element is mounted are assembled to a second cylindrical member (rear barrel) of the lens barrel (see, for example, Patent Document 2).
However, in the lens barrel described above, a dedicated cover member is required to fix the first tube member and the second tube member, which increases the number of assembling steps, the number of parts, the complexity of the structure, and the high The cost was increased.

JP 2005-215369 A JP 2011-039462 A

  The present invention has been made in view of the circumstances of the above prior art, and its object is to simplify the structure, reduce the number of parts, facilitate assembly work, reduce costs, and the like. Another object of the present invention is to provide a lens barrel that can easily align the optical axis and improve impact resistance, and an image pickup apparatus equipped with the lens barrel.

The lens barrel of the present invention is a lens barrel including a first cylinder member that holds an optical element, and a second cylinder member that joins the end of the first cylinder member and holds the optical element, The first cylindrical member has a protruding portion that protrudes in the radial direction from the outer periphery of the end portion, and the second cylindrical member is fitted with an adhesive while fitting the end portion and the protruding portion of the first cylindrical member. It has a fitting recess.
According to this configuration, the first cylindrical member holding the optical element (for example, holding the lens, the aperture plate, etc. while aligning the optical axis) and the optical element (holding the lens, the aperture plate, etc. with the optical axis aligned). In order to form a lens barrel by joining the second cylindrical member (held while holding), the end portion and the protruding portion of the first cylindrical member are fitted into the fitting concave portion of the second cylindrical member, and the optical axis of the first cylindrical member The optical axis is aligned with the optical axis of the second cylinder member, and the fitting recess is filled with an adhesive so as to embed the protruding portion (for example, in the case of an ultraviolet curable adhesive, the optical axis By irradiating and curing ultraviolet rays after alignment), both can be easily combined.
Here, by providing the protruding portion on the first cylindrical member, the bonding area by the adhesive increases, and accordingly the bonding strength can be increased, the structure is simplified, the number of parts is reduced, and the assembling work is facilitated. The optical axis can be easily aligned and the impact resistance can be improved while achieving cost reduction and the like.

In the above configuration, the protrusions of the first cylindrical member are formed in a plurality of arrangements in the circumferential direction of the end, and the fitting recess of the second cylindrical member receives the annular recess that receives the end and the plurality of protrusions. It is possible to employ a configuration including a plurality of widening recesses that are widened in the radial direction as much as possible.
According to this configuration, when the first cylinder member is coupled to the second cylinder member, the (annular) end of the first cylinder member is fitted into the annular recess of the second cylinder member, and the first cylinder member The plurality of protrusions are fitted into the plurality of widening recesses of the second cylindrical member, and in particular, since the plurality of widening recesses are filled and fixed with adhesive so as to bury the protrusions, the two are more firmly coupled. And the impact resistance can be further improved.

In the above configuration, the first tubular member has an annular projecting end surface formed so as to project annularly from the end portion in the axial direction, and the second tubular member is an annular receiver that closely contacts the annular projecting end surface in the annular recess. A configuration having a surface can be employed.
According to this configuration, when the first cylindrical member is joined to the second cylindrical member and the optical axis is aligned, the annular projecting end surface (the area of which is smaller than the end surface) of the first cylindrical member is the annular shape of the second cylindrical member. Since it makes contact with the receiving surface, resistance due to friction or the like is reduced, and alignment work (optical axis alignment) can be easily performed, and the annular projecting end surface is in close contact with the annular receiving surface, so that it is filled It is possible to prevent the adhesive from entering the inside.

The said structure WHEREIN: The structure which is formed so that the protrusion part of a 1st cylinder member may make the inclined surface where thickness becomes thin toward the outer side of radial direction is employable.
According to this configuration, the first cylindrical member and the second cylindrical member can be securely bonded to each other by forming the projecting portion in a tapered shape so that the adhesive is securely adhered.

In the above configuration, the first cylindrical member has a latching convex portion protruding radially from the outer periphery of the end portion thereof, and the second cylindrical member is formed to be widened in the radial direction so as to receive the latching convex portion. In addition, it is possible to employ a configuration having a latching recess for engaging the latching projection by rotating around the axis after joining the second widening recess and the first cylindrical member.
According to this configuration, the first cylindrical member and the second cylindrical member are not only bonded and bonded via the protruding portion, but also by engaging the latching convex portion of the first cylindrical member with the latching concave portion of the second cylindrical member. The cylindrical member can be more reliably coupled.

In the above-described configuration, the plurality of latching convex portions of the first cylindrical member are formed by being arranged in the circumferential direction of the end portion, and the second widening concave portion and the latching concave portion of the second cylindrical member are formed on the plurality of latching convex portions. A configuration in which a plurality of the regions are arranged in the circumferential direction in the corresponding region can be employed.
According to this configuration, when the first cylinder member is coupled to the second cylinder member, the plurality of latching protrusions of the first cylinder member are engaged with the plurality of second widening recesses of the second cylinder member. Since it is hooked in the concave portion, it is possible to more firmly bond both of them, and the impact resistance can be further improved.

The said structure WHEREIN: The structure in which the optical element hold | maintained at a 1st cylinder member contains a some lens and the optical element hold | maintained at a 2nd cylinder member can use a some lens can be used.
According to this configuration, in the configuration in which the first cylinder member holds the plurality of lenses and the second cylinder member holds the plurality of lenses, the optical axis of the lens of the first cylinder member and the light of the lens of the second cylinder member A lens barrel having excellent impact resistance and the like can be obtained while easily aligning the optical axis with the axis.

An imaging apparatus of the present invention is an imaging apparatus including a lens optical system, an imaging element, and a housing that houses the lens optical system and the imaging element, and the lens optical system has any one of the above configurations. It includes a lens barrel.
According to this configuration, since the lens barrel having the above-described configuration is provided, it is easy to align the optical axis while simplifying the structure, reducing the number of parts, facilitating assembly work, and reducing costs. And an impact resistance can be improved. In particular, an imaging device suitable for use as a digital camera, a vehicle-mounted camera, a surveillance camera, a portable information terminal, or the like can be obtained.

  According to the lens barrel having the above configuration, the optical axis can be easily aligned and the impact resistance can be improved while achieving the simplification of the structure, the reduction of the number of parts, the ease of assembling work, the cost reduction, and the like. In addition, by using this lens barrel, an imaging apparatus suitable for use as a digital camera, an in-vehicle camera, a surveillance camera, a portable information terminal, or the like can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing a lens barrel according to an embodiment of the present invention and before a first cylinder member and a second cylinder member are joined together. The 1st cylinder member contained in the lens barrel shown in FIG. 1 is shown, (a) is a front view, (b) is sectional drawing in E1-E1 in (a). The 2nd cylinder member contained in the lens barrel shown in FIG. 1 is shown, (a) is a front view, (b) is sectional drawing in E2-E2 in (a). FIG. 2 is a cross-sectional view showing a state where a first cylinder member is coupled to a second cylinder member in the lens barrel shown in FIG. 1. In the lens barrel shown in FIG. 4, it is the expanded sectional view which expanded the fitting recessed part of the edge part and protrusion part of a 1st cylinder member, and a 2nd cylinder member partially. FIG. 5 is an exploded perspective view showing another embodiment of the lens barrel according to the present invention, and before joining the first and second cylinder members. FIG. 7 is a perspective view showing a state in which the first cylinder member is joined to the second cylinder member (before bonding) in the lens barrel shown in FIG. 6. FIG. 8 is a perspective view showing a state in which the latching convex portion is latched by the latching concave portion by rotating the first cylindrical member around the axis (optical axis) in the lens barrel shown in FIG. 7. FIG. 9 is a cross-sectional view showing a relationship between a latching convex portion of a first cylindrical member and a latching concave portion of a second cylindrical member in the lens barrel shown in FIG. 8. FIG. 9 is a cross-sectional view showing the relationship between the end and protrusion of the first cylinder member and the fitting recess of the second cylinder member in the lens barrel shown in FIG. 8.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 to 4, the lens barrel according to this embodiment has a first cylinder member 10 having an axis that coincides with the optical axis L1 of the optical element, and an axis that is positioned with the optical axis L2 of the optical element. In addition, a second cylinder member 20 and the like for coupling the first cylinder member 10 are provided.
The first cylinder member 10 is coupled to the second cylinder member 20 while aligning the optical axis, thereby defining an optical axis L in which the optical axis L1 and the optical axis L2 coincide with each other. .
In addition, an imaging device such as a digital camera, an in-vehicle camera, a surveillance camera, and a portable information terminal can be provided by using the lens barrel as a lens optical system and a configuration including an imaging device and a housing that houses the lens optical system and the imaging device. It is formed.

  As shown in FIGS. 2 (a), 2 (b) and 4, the first cylinder member 10 is made of a resin material or the like, and an aperture plate P1, an optical element G1, a lens G2, a lens G3, and an aperture plate as optical elements. While holding P2, it is formed in a cylindrical shape having an axis line that coincides with the optical axis L1 of the lenses G1, G2, G3, and an annular step portion 11 for fitting the aperture plate P1, and a fitting inner circumference for fitting the lens G1. Part 12, fitting inner peripheral part 13 for fitting lens G 2, fitting inner peripheral part 14 for fitting lens G 3, annular stepped part 15 for fitting aperture plate P 2, annular end part 16, and axis 16 from end part 16 ( An annular projecting end surface 17 projecting annularly toward the rear in the direction of the optical axis L1), a plurality of projecting portions 18 projecting radially from the outer periphery of the end portion 16, and the like are provided.

As shown in FIG. 2 (b), the aperture plate P1 is disposed at the forefront of the first cylindrical member 10, and is formed in a shape that is fitted into the annular step portion 11, and has an optical path of a predetermined aperture. It is equipped with a circular hole.
As shown in FIG. 2 (b), the aperture plate P2 is disposed at the rearmost portion of the first cylindrical member 10, is formed in a shape that is fitted into the annular step portion 15, and has a predetermined optical path. It has a circular hole that narrows down to the diameter.
As shown in FIG. 2B, the lenses G1, G2, and G3 have an optical axis that coincides with the optical axis L1, and each has a plane or concave surface on the object side and a convex surface on the image surface side (convex shape or ) A lens having a meniscus shape.
As shown in FIG. 2B, the fitting inner peripheral portion 12 is formed so that the optical axis of the lens G <b> 1 coincides with the axis L <b> 1 of the first cylindrical member 10 by fitting the lens G <b> 1.
As shown in FIG. 2B, the fitting inner peripheral portion 13 is formed so that the optical axis of the lens G <b> 2 coincides with the axis L <b> 1 of the first cylinder member 10 by fitting the lens G <b> 2.
As shown in FIG. 2B, the fitting inner peripheral portion 14 is formed so that the optical axis of the lens G <b> 3 coincides with the axis L <b> 1 of the first cylinder member 10 by fitting the lens G <b> 3.
As shown in FIG. 2B, the annular step portion 11 is formed so that the center of the circular hole coincides with the axis (optical axis L1) of the first cylindrical member 10 by fitting the aperture plate P1. ing.
As shown in FIG. 2B, the annular step portion 15 is formed so that the center of the circular hole coincides with the axis (optical axis L1) of the first cylindrical member 10 by fitting the aperture plate P2. ing.

As shown in FIGS. 1 and 2, the end portion 16 is formed in a cylindrical shape and is fitted over a predetermined depth into an annular recess 22 that forms a part of the fitting recess 21 of the second cylinder member 20. It is formed as follows.
As shown in FIGS. 4 and 5, the annular projecting end surface 17 is formed so as to project annularly from the end portion 16 in the direction of the axis (optical axis L <b> 1). It is formed to be in close contact with. That is, the annular projecting end surface 17 is closely joined to the annular receiving surface 22a, whereby the distance in the optical axis L direction between the first cylindrical member 10 and the second cylindrical member 20 is defined (positioned).
As shown in FIGS. 1, 2 (a), 4, and 5, the protruding portion 18 protrudes in the radial direction from the outer periphery of the end portion 16 and is formed in an arc shape, and in the circumferential direction of the end portion 16. A plurality (here, six at intervals of approximately 60 degrees) are arranged and are fitted into the widening recesses 23 forming a part of the fitting recesses 21 of the second cylindrical member 20.
Further, as shown in FIG. 5, the protruding portion 18 is formed so as to form an inclined surface 18 a whose thickness decreases toward the outer side in the radial direction. Thus, by forming the projecting portion 18 in a tapered shape, the adhesive area of the projecting portion 18 is widened and the adhesive Gr is securely adhered, so that the first tubular member 10 and the second tubular member 20 are securely attached. Can be adhesively bonded.

  As shown in FIGS. 3A, 3 </ b> B, and 4, the second cylindrical member 20 uses a resin material or the like to hold the lens G <b> 4, the lens G <b> 5, and the aperture plate P <b> 3 as optical elements and the lens. A fitting recess 21 (annular) that is formed in a cylindrical shape having an axis L2 that coincides with the optical axes of G4 and G5 and that fits the end portion 16 and the protruding portion 18 of the first cylindrical member 10 and is filled with the adhesive Gr. A recess 22, a plurality of widening recesses 23), a fitting inner peripheral portion 24 into which the lens G 4 is fitted, a fitting inner peripheral portion 25 into which the lens G 5 is fitted, an annular stepped portion 26 into which the aperture plate P 3 is fitted.

As shown in FIG. 3B, the lenses G4 and G5 have a meniscus shape having an optical axis that coincides with the optical axis L2, and each having a convex surface on the object side and a concave surface on the image surface side.
As shown in FIG. 3 (b), the aperture plate P3 is disposed at the rearmost of the second cylindrical member 20, and is formed in a shape that is fitted into the annular step portion 26, and also has an outer edge of the lens G5. It is formed so as to serve as a presser plate that holds the part.

As shown in FIG. 1 and FIGS. 3A and 3B, the fitting recess 21 includes an annular recess 22 into which the end 16 of the first cylinder member 10 is fitted, and a plurality of protrusions 18 of the first cylinder member 10. And a plurality of (in this case, six) widening recesses 23 that can be filled with the adhesive Gr.
The annular recess 22 is formed so as to receive the end 16 of the first cylindrical member 10 with a predetermined gap, and in this region, the annular receiving surface 22a that closely contacts the annular protruding end surface 17 of the first cylindrical member 10. Are defined.
A plurality of widening recesses 23 are formed in the circumferential direction of the annular recess 22 (here, six at intervals of approximately 60 degrees) and are widened in the radial direction so as to receive the protrusions 18 of the first tubular member 10. And it is formed so as to form an arc shape having a predetermined length in the circumferential direction.
Further, as shown in FIG. 5, the widening recess 23 is in a state where the first tubular member 10 is joined to the second tubular member 20 (the end 16 is fitted into the annular recess 22 and the annular projecting end surface 17 is the annular receiving surface. 22a, and the protrusion 18 is fitted in the widened recess 23). The adhesive Gr is filled from the upper side of the protrusion 18 so that the protrusion 18 can be buried.

As shown in FIG. 3B, the fitting inner peripheral portion 24 is formed so that the optical axis of the lens G4 is aligned with the axis L2 of the second cylindrical member 20 by fitting the lens G4.
As shown in FIG. 3B, the fitting inner peripheral portion 25 is formed so that the optical axis of the lens G <b> 5 coincides with the axis L <b> 2 of the second cylindrical member 20 by fitting the lens G <b> 5.
As shown in FIG. 3B, the annular step portion 26 is formed so that the center of the circular hole coincides with the axis (optical axis L2) of the second cylindrical member 20 by fitting the aperture plate P3. ing.

Next, an assembling operation of the lens barrel having the above configuration will be briefly described.
First, the first cylindrical member 10 and the optical elements (lenses G4, G5, aperture plate P3) are aligned while the optical elements (caliber plate P1, lenses G1, G2, G3, aperture plate P2) are aligned. The second cylinder member 20 incorporated while being prepared is prepared.
Subsequently, the end 16 of the first tubular member 10 is joined to the second tubular member 20 so as to fit the annular recessed portion 22 and the protruding portion 18 into the widened recessed portion 23.
Subsequently, in a state where the annular projecting end surface 17 is in close contact with the annular receiving surface 22a, while confirming a photographed image or the like photographed by the imaging element or the like through the optical elements of the first tubular member 10 and the second tubular member 20, the first The first cylinder member 10 is finely adjusted with respect to the two cylinder members 20, and the optical axis L1 is positioned on the optical axis L2.
Thereafter, the widening recess 23 is filled with an adhesive Gr so as to cover and bury the protruding portion 18 and is cured by irradiating with ultraviolet rays.
Thus, the assembly of the lens barrel is completed.

According to the lens barrel having the above configuration, when the first barrel member 10 and the second barrel member 20 are combined to form the lens barrel, the end portion 16 and the protruding portion 18 of the first barrel member 10 are connected to the first barrel member 10. Fits into the fitting recess 21 (annular recess 22 and widening recess 23) of the two cylinder member 20, and widens while aligning the optical axis L1 of the first cylinder member 10 and the optical axis L2 of the second cylinder member 20. By filling the recess 23 with the adhesive Gr and fixing it, the two can be easily combined.
In particular, by providing the protrusion 18 on the first cylindrical member 10, the adhesion area by the adhesive Gr can be increased, and the adhesion strength can be increased correspondingly, simplifying the structure, reducing the number of parts, and assembling work. The optical axis can be easily aligned and the impact resistance can be improved while achieving simplification and cost reduction.
Further, the plurality of protrusions 18 of the first cylinder member 10 are fitted into the plurality of widening recesses 23 of the second cylinder member 20, and the adhesive Gr is filled in the plurality of widening recesses 23 so as to bury the protrusions 18. Therefore, the two can be bonded more firmly, and the impact resistance can be further improved.
Further, when the first cylinder member 10 is joined to the second cylinder member 20 for optical axis alignment, the annular protruding end surface 17 (which has a smaller area than the end surface) of the first cylinder member 10 is formed on the second cylinder member 20. Since the contact is made with the annular receiving surface 22a, the resistance due to friction or the like can be reduced and the alignment work can be easily performed. Also, since the annular projecting end surface 17 is in close contact with the annular receiving surface 22a, the filled bonding is performed. It is possible to prevent the agent Gr from entering the inside.

6 to 10 show another embodiment of a 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 description thereof is omitted.
In the lens barrel according to this embodiment, as shown in FIGS. 6 to 10, the first cylinder member 10 ′ having an axis coincident with the optical axis L1 of the optical element, and the axis line positioned with the optical axis L2 of the optical element are arranged. And a second cylinder member 20 ′ for coupling the first cylinder member 10 ′.

As shown in FIGS. 6 to 10, the first cylinder member 10 ′ uses a resin material or the like to hold the aperture plate P1, the lens G1, the lens G2, the lens G3, and the aperture plate P2 as optical elements, It is formed in a cylindrical shape having an axis line that coincides with the optical axis L1 of the lenses G1, G2, G3, and includes an annular step portion 11, a fitting inner peripheral portion 12, a fitting inner peripheral portion 13, a fitting inner peripheral portion 14, Annular step 15, annular end 16, annular projecting end surface 17, multiple (here 3) projections 18, multiple (here 3) hooks projecting radially from the outer periphery of end 16 A stop projection 19 or the like is provided.
As shown in FIGS. 6 to 9, the latching convex portion 19 protrudes in the radial direction from the outer periphery of the end portion 16 and is formed in an arc shape, and a plurality of (here, approximately 120) in the circumferential direction of the end portion 16. 3) and arranged so as to be fitted into the second widening recess 23 ′ forming a part of the fitting recess 21 of the second cylindrical member 20 ′ and to be latched by the latching recess 27. It has become.

As shown in FIGS. 6 to 10, the second cylindrical member 20 ′ uses a resin material or the like to hold the lens G4 ′ as an optical element and has an axis L2 that coincides with the optical axis of the lens G4 ′. It is formed in a cylindrical shape, and is fitted with the end 16, the protrusion 18 and the latching protrusion 19 of the first cylinder member 10 ′ and filled with the adhesive Gr (an annular recess 22, a plurality of (3 ) Widening recesses 23, plural (three) second widening recesses 23 ′), a fitting inner peripheral portion 24 into which the lens G4 ′ is fitted, and a latching convex portion 19 of the first cylindrical member 10 ′. A plurality of (three) latching recesses 27 are provided.
As shown in FIG. 9, the lens G4 ′ is a lens having an optical axis that coincides with the optical axis L2, and having a meniscus shape having a convex surface on the object side and a concave surface on the image surface side.
In the region corresponding to the plurality of latching protrusions 19, the second widening recesses 23 ′ are formed by being arranged in a plurality (here, three at intervals of approximately 120 degrees) in the circumferential direction of the annular recess 22. In order to receive the latching convex part 19 of 1 cylinder member 10 ', it forms so that it may expand in radial direction and make circular arc shape of predetermined length in the circumferential direction.
The latching recesses 27 are formed in the circumferential direction so as to cover a part of the second widening recesses 23 ′ from the front side (in this case, three at intervals of about 120 degrees). After the members 10 ′ are joined, the members 10 ′ are rotated around the axis (optical axis L) so that the corresponding latching protrusions 19 are latched.

Next, an assembling operation of the lens barrel having the above configuration will be briefly described.
First, the first cylindrical member 10 'in which the optical element (the aperture plate P1, the lenses G1, G2, G3, and the aperture plate P2) is assembled while being aligned, and the optical element (the lens G4') is incorporated while being aligned. A second cylinder member 20 'is prepared.
Subsequently, the end 16 of the first tubular member 10 ′ is fitted into the annular recess 22, the projecting portion 18 is fitted into the widened recess 23, and the latching projection 19 is fitted into the second widened recess 23 ′. 20 '.
Subsequently, in a state in which the annular projecting end surface 17 is in close contact with the annular receiving surface 22a, the first tubular member 10 ′ is rotated around the axis (counterclockwise) with respect to the second tubular member 20 ′, and the latching protrusion While the part 19 is hooked on the latching recess 27, the second cylinder member 20 is confirmed while confirming a photographed image or the like photographed by the imaging element or the like through the optical elements of the first cylinder member 10 'and the second cylinder member 20'. The first tube member 10 ′ is finely adjusted with respect to ′ so that the optical axis L 1 is positioned on the optical axis L 2.
Thereafter, the widening recess 23 is filled with an adhesive Gr so as to cover and bury the protruding portion 18 and is cured by irradiating with ultraviolet rays.
Thus, the assembly of the lens barrel is completed.

According to the lens barrel having the above-described configuration, not only is the adhesive coupling via the protruding portion 18, but the latching convex portion 19 of the first cylindrical member 10 ′ is hooked on the latching concave portion 27 of the second cylindrical member 20 ′. By stopping, the first cylinder member 10 ′ and the second cylinder member 20 ′ can be more reliably coupled.
In particular, when the first cylinder member 10 ′ is joined to the second cylinder member 20 ′, the plurality of latching protrusions 19 of the first cylinder member 10 ′ are the plurality of second widening recesses 23 of the second cylinder member 20 ′. Since it is hooked to the latching recess 27 while being fitted in the ′, the both can be more firmly coupled and the impact resistance can be further improved.

  In the above embodiment, the aperture plates P1, P2, P3, lenses G1, G2, G3, G4, G4 ′ are used as the optical elements held by the first cylindrical members 10, 10 ′ and the second cylindrical members 20, 20 ′. , G5 are shown, but the present invention is not limited to this. For example, an optical filter or an image sensor may be held with respect to the second cylindrical member.

  As described above, the lens barrel of the present invention can easily align the optical axis and achieve shock resistance while achieving simplification of the structure, reduction in the number of parts, ease of assembly work, cost reduction, and the like. Image pickup apparatus used in other environments as well as a lens optical system of an image pickup apparatus such as a digital camera, an in-vehicle camera, a surveillance camera, and a portable information terminal. It is also useful as a lens optical system.

10, 10 'first cylinder member P1, P2 aperture plate (optical element)
G1, G2, G3 lenses (optical elements)
L1 Optical axis (axis)
16 End 17 Annular protruding end surface 18 Protruding portion 18a Inclined surface 19 Hook convex portion 20, 20 'Second cylindrical member G4, G4', G5 Lens (optical element)
L2 Optical axis (axis)
P3 aperture plate (optical element)
21 fitting recess 22 annular recess 22a annular receiving surface 23 widening recess 23 'second widening recess 27 latching recess

Claims (8)

A lens barrel that includes a first cylinder member that holds an optical element, and a second cylinder member that joins an end of the first cylinder member and holds the optical element;
The first cylindrical member has a protruding portion protruding in a radial direction from the outer periphery of the end portion,
The second cylinder member has a fitting recess for fitting the end portion and the protruding portion of the first cylinder member and filling the adhesive,
A lens barrel characterized by that. The protrusion is formed by arranging a plurality of protrusions in the circumferential direction of the end,
The fitting recess includes an annular recess that receives the end portion, and a plurality of widening recesses that are formed to expand in the radial direction to receive the plurality of protrusions.
The lens barrel according to claim 1. The first cylindrical member has an annular projecting end surface formed to project annularly from the end in the axial direction,
The second cylindrical member has an annular receiving surface that closely contacts the annular projecting end surface in the annular recess.
The lens barrel according to claim 1 or 2, wherein The protrusion is formed so as to form an inclined surface whose thickness decreases toward the outside in the radial direction.
The lens barrel according to any one of claims 1 to 3, wherein: The first cylindrical member has a latching convex portion projecting radially from the outer periphery of the end portion,
The second cylindrical member is rotated around an axis after joining the second widened recess formed by expanding in the radial direction to receive the latching convex and the first cylindrical member, and the latching convex Having a latching recess for latching,
The lens barrel according to any one of claims 1 to 4, wherein: A plurality of the latching protrusions are arranged in the circumferential direction of the end,
A plurality of the second widening recesses and the latching recesses are arranged in the circumferential direction in a region corresponding to the plurality of latching projections,
The lens barrel according to claim 5. The optical element held by the first cylindrical member includes a plurality of lenses,
The optical element held by the second cylindrical member includes a plurality of lenses.
The lens barrel according to any one of claims 1 to 6, wherein: An imaging apparatus comprising a lens optical system, an image sensor, and a housing that houses the lens optical system and the image sensor,
The lens optical system includes the lens barrel according to any one of claims 1 to 7,
An imaging apparatus characterized by that.

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