JP2020030387A - Lens unit and douser - Google Patents

Abstract

To provide a lens unit comprising a plurality of lenses and a lens barrel arranged between the lenses and holding a douser, with which a douser capable of following the outside diameter of the lenses is realized.SOLUTION: The lens unit comprises a lens group constituting a wide angle lens, a diaphragm 52 sandwiched between the lenses of the lens group (third lens 23, fourth lens 24 (lens holder 4)), and a lens barrel 3 provided with a barrel part (second barrel part 32) for accommodating the lens group and the diaphragm 52 from an object side L1 toward an image side L2 in the direction of the optical axis. The diaphragm 52 is provided on an outer circumferential portion with a deformation part 524 that is deformed in accordance with the contact state with a second barrel part inner circumferential surface 62 when accommodated in the second barrel part 32.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a light-shielding plate and a lens unit, for example, a light-shielding plate that is arranged and held between lenses together with a plurality of lenses, and a lens unit that holds such a plurality of lenses and a light-shielding plate in a lens barrel.

  2. Related Art A lens unit having a configuration in which a plurality of lenses are stacked inside a lens barrel is known. In such a lens unit, a light-shielding plate for light-shielding or a diaphragm may be used between the lenses. In recent years, there has been a demand for higher performance lens units, and it is necessary to assemble light shielding plates with high accuracy. In order to respond to such a demand, various technologies have been proposed. For example, there is a technique in which an urging means is provided on a light shielding plate so that the light shielding plate is not moved when the light shielding plate is disposed between the lenses (for example, see Patent Document 1). According to the technique disclosed in Patent Document 1, it is possible to prevent the light-shielding plate from being displaced, and to achieve desired light-shielding performance.

JP-A-2006-191742

  By the way, when the lenses held in the lens barrel are plastic lenses, those lenses are press-fitted and fixed in the cylindrical part of the lens barrel. The fitting by press-fitting and fixing is performed by adjusting the inner diameter of the barrel of the lens barrel to the outer diameter of the plastic lens. For this reason, the outer diameter of the plastic lens is the basis for all. Therefore, a member disposed between the lenses, such as a light-shielding plate, is also affected by the influence. In some cases, there is a possibility of remanufacturing to follow the outer diameter of the lens. Generally, the outer diameter of the light-shielding plate cannot be determined unless the outer diameter of the plastic lens is known. If the fitting diameter is small, the light-shielding plate is bent and deformed, and if it is large, play is generated. If the light-shielding plate is prepared after the lens outer diameter is determined, the delivery time will be severe, so it is necessary to assume some dimensions and prepare some standard products in order to respond with a short delivery time. As a result, there is a problem that a standard product is wasted without being used. As a result, a technology capable of following the outer diameter of the lens has been required.

  The present invention has been made in view of the above circumstances, and in a lens unit including a plurality of lenses and a lens barrel holding a light shielding plate disposed between the lenses, a light shielding plate capable of following the outer diameter of the lens The purpose is to provide a technology that realizes.

  The lens unit according to the aspect of the invention includes a plurality of lenses, a light-shielding plate disposed between the lenses in the plurality of lenses, and the plurality of lenses and the light-shielding plate arranged from the object side to the image side in the optical axis direction. A lens barrel having a cylindrical portion that accommodates the light-shielding plate toward the inner peripheral surface of the cylindrical portion when the light-shielding plate is accommodated in the cylindrical portion. It is provided with a deforming portion that deforms according to the situation. As the light shielding plate, for example, there are an aperture and a light shielding sheet. By providing the light shielding plate with a deformable portion as a function capable of following the outer diameter of the lens, it is possible to absorb distortion caused by backlash or bending when the light shielding plate is accommodated in the cylindrical portion of the lens barrel. In other words, there is no need to prepare a plurality of light-shielding plates having different outer diameters, so that workability can be improved and cost can be reduced. Further, even when the light-shielding plate is displaced when incorporated in the lens barrel, the deformed portion is deformed and absorbs the displacement, so that the adverse effect on the lens performance can be eliminated, and a lens unit with higher performance can be realized.

  The lens adjacent to the light shielding plate on the object side may have a shape in which an image side portion of an outer peripheral surface is separated from the inner peripheral surface of the cylindrical portion in a press-fit state. Since the lens adjacent to the light-shielding plate on the object side has such a separated shape, it is possible to secure a space to escape when the deformed portion is deformed to the object side. That is, since the deformed deformed portion does not interfere with the adjacent lens on the object side, the lens is stored in the cylindrical portion without being shifted by the light shielding plate.

  The deformation portion may be formed radially outward of a mounting surface formed on an image-side surface of a lens adjacent to the light-shielding plate on the object side. When a plurality of lenses and a light-shielding plate are accommodated in a lens barrel, the light-shielding plate is sandwiched between a lens adjacent on the object side and a lens adjacent on the image side. In general, a mounting surface provided on an image-side flange surface of a lens adjacent on the object side is mounted on a flat portion of an object-side flange surface of a lens adjacent on the image side via a light shielding plate. At this time, if the light-shielding plate is deformed or the like in a region sandwiched between the mounting surface and the flat portion, the lens on the object side shifts. However, since the deformed portion is formed radially outside the mounting surface of the lens adjacent to the light shielding plate and the object side, the deformed portion is deformed when the light shielding plate is accommodated in the cylindrical portion, and the deformed portion is formed on the object side. The mounting surfaces of adjacent lenses are not mounted. Therefore, it is possible to prevent the position of the lens on the object side from being shifted by the deformed portion.

  The inner peripheral surface of the cylindrical portion may include a plurality of centering protrusions protruding radially inward, and the centering protrusions may be in contact with the outer peripheral surface of the light shielding plate. Since the deformable portion is deformed at a portion that comes into contact with the alignment protrusion, the deformable portion can be easily accommodated in the cylindrical portion. In addition, since the deformation area of the deformation portion does not excessively increase, it is possible to further suppress the occurrence of a positional shift or the like due to the deformation portion of the lens adjacent to the light shielding plate.

  The deformation portion may be a circumferential slit cut out from the object side toward the image side. Since it is provided in a circumferential shape, it can be similarly deformed at any position in the circumferential direction.

  The deformable portion may be a circumferential step portion in which an object side portion of an outer peripheral surface is cut out.

  The deformed portion may be a plurality of notched portions cut radially inward from the outer peripheral surface. There is no limitation on the number of cutouts, but in the case of a configuration in which alignment protrusions are provided on the inner peripheral surface of the cylinder, the same number of alignment protrusions allows the well-balanced deformed parts to be formed. Can be deformed.

  The light blocking plate may be a stop for stopping a light beam inside the lens barrel.

  The aperture may be made of metal.

  The light shielding plate may be a light shielding sheet for shielding unnecessary light. Unnecessary light is light such as scattered light and confusion light. The light-shielding sheet prevents such light from entering a light-receiving unit (a light-receiving sensor or the like).

  The present invention is a light-shielding plate arranged between lenses in a cylindrical portion of a lens barrel that accommodates a lens of a lens unit, and has an outer peripheral portion, inside the cylindrical portion when housed in the cylindrical portion. A deformable portion is provided that deforms according to the state of contact with the peripheral surface.

  According to the present invention, in a lens unit including a plurality of lenses and a lens barrel holding a light shielding plate disposed between the lenses, the light shielding plate is provided with a deformable portion as a function capable of following the outer diameter of the lens. Thus, even when the light-shielding plate is housed in the barrel portion of the lens barrel, even if distortion due to backlash or bending occurs, it can be absorbed.

FIG. 2 is a diagram illustrating an entire lens unit according to the embodiment. FIG. 2 is a longitudinal sectional view of a lens barrel according to the embodiment. FIG. 5 is a cross-sectional view showing an inner peripheral surface of a second cylindrical portion of the lens barrel according to the embodiment. FIG. 3 is a diagram illustrating an aperture according to the embodiment. It is sectional drawing which showed the state which concerns on embodiment and the throttle was arrange | positioned at the 2nd cylinder part. It is the figure which expanded and showed the area | region A3 of FIG. 5 which concerns on embodiment. FIG. 9 is a diagram illustrating an aperture according to a modification of the embodiment.

  Hereinafter, embodiments for carrying out the invention (hereinafter, referred to as “embodiments”) will be described with reference to the drawings.

  Hereinafter, the lens unit 1 according to the present embodiment will be described with reference to the drawings. The lens unit 1 is a lens assembly that includes a wide-angle lens (lens group 2) and is incorporated in an in-vehicle monitoring camera, a monitoring camera, a door phone, and the like. In the following embodiments, the “optical axis direction” refers to a direction parallel to the optical axis L, and the “object side” and “image side” refer to the object side L1 and the image side L2 in the optical axis L direction.

(Overall configuration of lens unit)
FIG. 1 is a perspective view showing a lens unit 1 according to the present embodiment, viewed from an object side L1 in FIG. 1A, and FIG. 1B is a longitudinal sectional view. FIG. 2 is a longitudinal sectional view of the lens barrel 3, in which the lens group 2 is omitted from FIG. 3 is a cross-sectional view of the lens barrel 3, FIG. 3A is a cross-sectional view corresponding to a position X1-X1 in FIG. 2, and FIG. 3B is an enlarged view of a region A3 in FIG. FIG.

  As illustrated, the lens unit 1 includes a lens group 2 that forms a wide-angle lens, and a lens barrel 3 that houses the lens group 2.

(Lens configuration)
The lens groups 2 each have a disk shape having a circular peripheral edge, are arranged coaxially, and realize a lens function as a whole. Specifically, the lens group 2 includes a first lens 21, a second lens 22, a third lens 23, a fourth lens 24, a fifth lens 25, and a sixth lens 26 in order from the object side L1. I have. The fifth lens 25 and the sixth lens 26 are cemented to form a cemented lens 27. The fourth lens 24 is held by the lens holder 4 made of resin. An infrared filter 91 is mounted on the image side L2 of the sixth lens 26 so as to close the opening on the image side L2 of the lens barrel 3, and a light receiving sensor (not shown) is further disposed on the image side L2. .

  Between the second lens 22 and the third lens 23, a substantially disk-shaped light shielding sheet 51 is disposed as a light shielding plate 50. A substantially disk-shaped diaphragm 52 is disposed between the third lens 23 and the fourth lens 24 as a light shielding plate 50. The light shielding sheet 51 prevents unnecessary light such as scattered light and confusion light from entering the light receiving sensor (not shown) arranged on the image side L2 from the infrared filter 91. The stop 52 is used to stop a light beam inside the lens barrel 3.

  Since the lens group 2 is housed in the lens barrel 3 from the object side L1 to the image side L2, the first lens 21, the second lens 22, the third lens 23, and the fourth lens 24 (note that the lens holder 4 The outer diameter of the fifth lens 25 and the sixth lens 26 gradually decreases in this order. The first to fifth lenses 21 to 25 are each made of a glass lens or a plastic lens. In the present configuration, the first lens 21 and the fourth lens 24 are glass lenses, and the second, third, fifth, and sixth lenses 22, 23, 25, and 26 are plastic lenses, but are not limited thereto.

(Structure of lens barrel)
The lens barrel 3 is a resin molded product, and includes a first cylindrical portion 31 and a second cylindrical portion 32 as a lens chamber for housing the lens group 2. Specifically, the lens barrel 3 has an inner peripheral surface 60 (lens chamber) formed along the outer peripheral surface of each lens constituting the lens group 2 toward the image side L2. Here, the first cylindrical portion 31 on the object side L1 and the second cylindrical portion 32 on the image side L2 are formed so as to communicate with their inner peripheral surfaces (that is, lens chambers).

  The first lens 21 is disposed on the inner peripheral surface 61 of the first cylindrical portion 31. The second to sixth lenses 22 to 26 are arranged on the inner peripheral surface 62 of the second cylindrical portion 32 of the second cylindrical portion 32. An end of the first cylindrical portion 31 on the image side L2 of the first inner circumferential surface 61 and an end of the second cylindrical portion 32 on the object side L1 of the second inner circumferential surface 62 are connected in a stepped manner.

  In the second cylindrical portion 32, a circumferential groove 49 which is lightened at a predetermined depth from the image side L2 toward the object side L1 is formed in an annular shape so as to surround the second cylindrical portion inner peripheral surface 62 of the second cylindrical portion 32. Is formed.

  The end portion of the image side L2 of the first cylindrical portion 31, that is, the region where the first cylindrical portion 31 and the second cylindrical portion 32 are connected is an annular region on the inner peripheral surface side of the first cylindrical portion 31. A flat surface 63 and a convex portion 64 bulging toward the object side L1 on the optical axis L side (ie, radially inward) of the flat surface 63 are formed.

  After the seal member 7 made of an O-ring is fitted into the annular concave portion 63, the first lens 21 is placed on the convex portion 64, and positioning in the optical axis direction is performed. After that, the outer peripheral edge of the first lens 21 is fixed by the caulking portion 38 formed at the end of the first cylindrical portion 31 on the object side L1.

  On the image side L2 side of the second cylindrical portion 32, a sixth lens housing portion 69 having a smaller diameter than the second cylindrical portion inner peripheral surface 62 and housing the sixth lens 26 is formed. The above-described opening 69a is formed at an end of the sixth lens housing portion 69 on the image side L2.

  On the inner peripheral surface 62 of the second cylindrical portion 32, as shown in FIGS. 2 and 3, for example, twelve centering protrusions 80 are formed radially inwardly at equal intervals in the circumferential direction. Bulging shape). Of the lenses constituting the lens group 2, the second to fifth lenses 22 to 25 are press-fitted (generally lightly press-fitted) into the centering protrusion 80, and their outer peripheral surfaces are the second cylindrical portion 32. It is positioned in the radial direction by being supported by the inner peripheral surface 62 (the centering projection 80). In the fifth lens 25 and the sixth lens 26 which are the cemented lens elements of the cemented lens 27, as described above, the fifth lens 25 is in a press-fit state on the inner peripheral surface 62 of the second cylindrical portion. It is in a non-contact state with respect to the six-lens housing section 69.

  Further, the light-shielding sheet 51 and the stop 52 which are the light-shielding plates 50 are also arranged such that their outer peripheral surfaces are in contact with the centering projection 80.

  After the second lens 22 to the sixth lens 26 and the light shielding plate 50 (the light shielding sheet 51 and the aperture 52) are pressed into the second cylindrical portion inner peripheral surface 62, the outer peripheral portion of the object side L1 of the second lens 22 is moved to the second cylindrical portion. It is locked by a caulking portion 39 provided at the end of the object-side inner peripheral surface of the portion 32.

(Characteristics of shading plate)
As described above, when the second lens 22 to the sixth lens 26 of the lens group 2 are disposed in the second barrel 32 of the lens barrel 3, the light shielding plate 50 (the light shielding sheet 51 and the aperture 52) is placed between the lenses. Sandwiched. The fitting of the second lens 22 to the sixth lens 26 by press fitting is performed according to the outer diameter of the plastic lens (the fourth lens 24 is the outer diameter of the lens holder 4 made of resin). By adjusting the inner diameter of the portion 32, fixing by an appropriate pressure is realized. That is, the outer diameter of the plastic lens is the basis for all. If the light shielding plate 50 is arranged after the standard is determined, it is difficult to quickly respond to the delivery date. Therefore, in the present embodiment, the light shielding plate 50 has a function of following the outer diameter of the lens.

  Hereinafter, with reference to FIGS. 4 to 7, the stop 52 disposed between the third lens 23 and the fourth lens 24 (the lens holder 4) as the light shielding plate 50 will be described in detail. The same function can be applied to the light shielding sheet 51 disposed between the third lenses 23.

  FIG. 4 is a view showing the aperture 52, FIG. 4 (a) is a perspective view, FIG. 4 (b) is a sectional perspective view, and FIG. 4 (c) is an enlarged view of an area A3 in FIG. 4 (b). is there. FIG. 5 is an enlarged view of the area A1 in FIG. 1B, and the diaphragm 52 is sandwiched between the third lens 23 and the fourth lens 24 (lens holder 4) which are pressed into the second cylindrical portion 32. Is shown. FIG. 6 is an enlarged view of the area A3 in FIG. 5 and is a view showing the deformation state of the deformation section 524 of the diaphragm 52 in detail.

  The diaphragm 52 is disk-shaped, and has a diaphragm opening 523 at the center. The diaphragm 52 is made of, for example, a metal material such as phosphor bronze or a resin material such as polyester, and has a thickness of 30 to 50 μm. A deformed portion 524 is formed on the outer peripheral portion of the aperture 52. More specifically, the deformation portion 524 is a circle cut out from the object side L1 (aperture object side surface 521) to the image side L2 (aperture image side surface 522) on the outer peripheral portion of the diaphragm object side surface 521 of the diaphragm 52. It is formed as a circumferential slit. The slit is formed by, for example, etching. When the diaphragm 52 is made of a metal material, it has higher strength than a resin material, and it is difficult to deform only at the press-fit portion. Therefore, a shape like the deformed portion 524 is particularly necessary.

  When the diaphragm 52 is accommodated in the second cylindrical portion 32, as shown in FIG. 3B and FIGS. 5 and 6, the diaphragm outer peripheral surface 526 (indicated by a two-dot broken line in FIG. 3B). Abuts on the centering projection 80 formed on the inner peripheral surface 62 of the second cylindrical portion. Since the aperture 52 is larger than the diameter of the second cylindrical portion inner peripheral surface 62 (alignment projection 80) as shown by the broken line in FIG. As shown by the solid line 6, the deformed portion 524 is bent by the resistance of the contact between the diaphragm outer peripheral surface 526 of the diaphragm 52 and the centering projection 80, and the outer peripheral portion 525 on the outer diameter side of the deformed portion 524 is formed. Become diagonal.

  At this time, the contact state between the centering projection 80 and the outer peripheral surface 526 of the aperture changes depending on the relative relationship between the outer diameter of the aperture 52 and the inner diameter of the second cylindrical portion 32. That is, if the outer diameter of the stop 52 is relatively large, the bending of the deformed portion 524 becomes large. As described above, by providing the deformable portion 524 as a function capable of following the lens outer diameter, distortion caused by backlash or bending when the diaphragm 52 is accommodated in the second cylindrical portion 32 can be absorbed.

  In addition, since only the portion of the deforming portion 524 that is in contact with the centering protrusion 80 is deformed, no resistance occurs in other portions and the deformable portion 524 can be easily housed in the second cylindrical portion 32. Further, since the deformation area of the deformation portion 524 does not excessively increase, it is possible to further suppress the occurrence of a positional shift or the like in the third lens 23 adjacent to the stop 52 due to the deformation portion 524.

  In the third lens 23 adjacent to the diaphragm 52 on the object side L1, the outer peripheral object side portion 231 on the outer peripheral surface is in a press-fit state on the second cylindrical portion inner peripheral surface 62 (alignment projection 80), and is located below the outer peripheral surface. The outer peripheral surface image side portion 232 on the side is an inclined surface that inclines toward the inner diameter side as it proceeds to the image side L2. In other words, the outer peripheral surface image side portion 232 is separated from the centering protrusion 80 of the second cylindrical portion inner peripheral surface 62 at the position of the stop 52. As a result, a certain space is formed on the object side L1 from the outer peripheral portion 525 of the stop 52. This space functions as a clearance space 68 for accommodating the outer peripheral portion 525 when the deformed portion 524 is bent and the outer peripheral portion 525 faces upward. Note that the outer peripheral surface of the third lens 23 that forms the escape space 68 may be a stepped portion that is recessed radially inward, in addition to the inclined surface.

  By having such a clearance space 68, even if the deformed portion 525 is bent and a portion facing the object side L1 (that is, the outer peripheral portion 525) is generated, the deformed portion 525 interferes with the third lens 23 adjacent on the object side L1. There is no. As a result, the third lens 23 is housed in the second cylindrical portion 32 without being displaced by the influence of the aperture 52.

  When the third lens 23 is placed on the fourth lens 24 (lens holder 4), the flange of the third lens 23 is attached to the object-side flat portion 4 a formed on the object-side L 1 surface of the lens holder 4. The mounting surface 23a formed on the image side L2 of the portion is mounted. Positioning in the optical axis direction is performed between the object-side flat portion 4a and the mounting surface 23a. The diaphragm 52 is sandwiched between the object-side flat portion 4a and the mounting surface 23a, but the deformed portion 524 is formed radially outside the mounting surface 23a. Therefore, when the deforming portion 524 bends, it is not hindered by the mounting surface 23a of the third lens 23. In a region between the mounting surface 23a and the object-side flat portion 24a, more specifically, in a position below the mounting surface 23a, if there is a deformation or the like by the deformation portion 524, the third lens 23 on the object side L1 Deviation occurs, but such a problem can be prevented.

(Modification of light shielding plate)
FIG. 7 illustrates two modified light shielding plates 50. In the stop 52A shown in FIG. 7A, notches 524A cut out by a predetermined length radially inward from the stop outer peripheral surface 526 are formed at twelve locations at equal intervals instead of the deformed portions 524 described above. . The number of the notches 524A is not limited, but in the case of the configuration in which the alignment protrusions 80 are provided, the same number of the alignment protrusions 80 can be used to achieve a well-balanced notch 524A (more specifically, the notch 524A). (A region radially outside of the portion 524A) can be deformed. Further, when forming the deformed portion on the light shielding plate 50 made of a resin material such as polyester, the cutout portion 524A is generally easier to form than the deformed portion 524 made of the slit in the embodiment.

  In the stop 52B shown in FIG. 7B, the image side L2 of the outer peripheral portion is formed as a circumferential step 524B having a predetermined width T1. From the viewpoint of deformation (following the outer diameter of the lens), the portion removed on the step is desirably １ ／ or less the thickness of the stop 52B. In addition, when forming the deformed portion on the light shielding plate 50 made of a resin material such as polyester, the step portion 524B is generally easier to form than the deformed portion 524 made of the slit of the embodiment.

The features of the present embodiment are summarized as follows. Note that the configuration common to the embodiment and the modified example will be described by representing the configuration of the embodiment.
The lens unit 1 is disposed between the lens group 2 including the first to sixth lenses 21 to 26 and the lenses in the lens group 2 (the third lens 23 and the fourth lens 24 (the lens holder 4)). The light-shielding plate 50 (here, the stop 52), the lens unit 2 and the light-shielding plate 50 (the stop 52) are accommodated in the optical axis direction from the object side L1 toward the image side L2. And a lens barrel 3 having a second cylindrical portion 32). The outer peripheral portion of the light-shielding plate 50 (aperture 52) is in contact with the inner peripheral surface 60 (the second cylindrical portion inner peripheral surface 62) when housed in the cylindrical portion 30 (here, the second cylindrical portion 32). A deforming section 524 that deforms in response is provided. The light shielding plate 50 (aperture 52) is provided with a deformable portion 524 as a function capable of following the lens outer diameter, so that the light shielding plate 50 (aperture 52) becomes a cylindrical portion 30 of the lens barrel 3 (a second cylindrical portion 32). Can absorb the backlash or the distortion caused by the bending when housed in the housing.

  The lens (third lens 23) adjacent to the light blocking plate 50 (aperture 52) on the object side L <b> 1 is such that the image side portion of the outer peripheral surface (the outer peripheral image side portion 232) has the inner peripheral surface of the cylindrical portion 30 in the press-fit state. The shape may be separated from the surface 60 (the second cylindrical portion inner peripheral surface 62). Since the lens adjacent to the light-shielding plate 50 on the object side L1 has such a separated shape, it is possible to secure a space to escape when the deformed portion 524 is deformed to the object side L1. That is, since the deformed deformed portion 525 does not interfere with the adjacent lens on the object side L1, the lens is stored in the cylindrical portion 30 without displacement.

  The deformation portion 524 is formed radially outside of the mounting surface 23a formed on the image side L2 surface of the lens (third lens 23) adjacent to the light shielding plate 50 (aperture 52) on the object side L1. ing. For example, the mounting surface 23a provided on the image side flange surface of the third lens 23 adjacent to the stop 52 which is the light shielding plate 50 on the object side L1 is a fourth lens adjacent to the image side L2 via the stop 52. The object 24 is placed on a flat portion of the object-side flange surface (here, the object-side flat portion 24a of the lens holder 4). Since the deforming portion 524 is formed radially outside of the mounting surface 23a of the third lens 23 adjacent to the stop 52 on the object side L1, the deformed portion is deformed when the stop 52 is stored in the second cylindrical portion 32. The mounting surface 23a of the third lens 23 adjacent on the object side L1 is not mounted on the portion 524, and the position of the third lens 23 on the object side L1 is prevented from being shifted by the deformation portion 524. it can.

  The inner peripheral surface 60 of the cylindrical portion 30 (the inner peripheral surface 62 of the second cylindrical portion 32 of the second cylindrical portion 32) is provided with a plurality of centering projections 80 that protrude radially inward. Since the deformed portion 524 is deformed only at the portion that comes into contact with the centering protrusion 80, the deformable portion 524 can be easily housed in the second cylindrical portion 32. Further, since the deformation area of the deformation portion 524 does not excessively increase, it is possible to further suppress the occurrence of a positional shift or the like in the third lens 23 adjacent to the stop 52 due to the deformation portion 524.

  The deforming portion 524 is a circumferential slit cut out from the object side L1 to the image side L2. As shown in the modified example, the deformed portion 524 includes a circumferential stepped portion 524B in which the object side portion of the outer peripheral surface (526) is cut out, and a plurality of notches radially inward from the outer peripheral surface. Notch 524A may be used.

  As described above, the present invention has been described based on the embodiment. However, this embodiment is an exemplification, and various modifications can be made to the combination of each component, and such a modification is also described in the present embodiment. It is understood by those skilled in the art that they are within the scope of the invention. For example, as the shape of the deforming portion 524 of the diaphragm 52 in the above-described configuration, the shape of the object side L1 is used, but a shape corresponding to the image side L2 may be provided. For example, the image side L2 of the outer peripheral portion of the stop 52 may be etched in a tapered shape.

REFERENCE SIGNS LIST 1 lens unit 2 lens group 3 lens barrel 4 lens holder 4 a object-side flat part 7 seal member 21 first lens 22 second lens 23 third lens 23 a mounting surface 24 fourth lens 25 fifth lens 26 sixth lens 27 junction Lens 30 Tube portion 31 First tube portion 32 Second tube portion 38, 39 Caulking portion 49 Circumferential groove 50 Light shielding plate 51 Light shielding sheet (light shielding plate)
52, 52A, 52B Aperture (light shield)
Reference numeral 60: inner peripheral surface 61: first cylindrical portion inner peripheral surface 62: second cylindrical portion inner peripheral surface 63: flat surface 64: convex portion 68: clearance space 69: sixth lens accommodating portion 69a: opening 80: centering protrusion 91: infrared filter 231: outer peripheral object side portion 232 Outer peripheral image side 521 Aperture object side surface 522 Aperture image side 523 Aperture opening 524 Deformed portion 524A Notch (deformed portion)
524B Step (deformation)
525 Outer peripheral portion 526 Aperture outer peripheral surface L Optical axis L1 Object side L2 Image side

Claims (11)

With multiple lenses,
A light-shielding plate interposed between the lenses in the plurality of lenses,
A lens barrel including a cylindrical portion that houses the plurality of lenses and the light shielding plate from the object side to the image side in the optical axis direction,
Has,
A lens unit provided on an outer peripheral portion of the light-shielding plate, the lens unit having a deformable portion that is deformed in accordance with a state of contact with an inner peripheral surface of the cylindrical portion when the light-shielding plate is housed in the cylindrical portion. .   The lens adjacent to the light-shielding plate on the object side has a shape in which an image-side portion of an outer peripheral surface is separated from the inner peripheral surface of the cylindrical portion in a press-fit state. The lens unit as described.   The said deformation | transformation part is formed in the radial direction outer side than the mounting surface formed in the image side surface of the lens adjacent to the said light shielding plate and an object side, The Claim 1 or 2 characterized by the above-mentioned. Lens unit. The inner peripheral surface is provided on the inner peripheral surface with respect to the cylindrical portion, and includes a plurality of centering protrusions protruding radially inward,
The lens unit according to any one of claims 1 to 3, wherein the centering projection is in contact with an outer peripheral surface of the light shielding plate.   The lens unit according to any one of claims 1 to 4, wherein the deformable portion is a circumferential slit cut out from an object side toward an image side.   The lens unit according to any one of claims 1 to 4, wherein the deformable portion is a circumferential stepped portion in which an object side portion of an outer peripheral surface is cut out.   The lens unit according to any one of claims 1 to 4, wherein the deformation portion is a plurality of cutout portions cut radially inward from an outer peripheral surface.   The lens unit according to any one of claims 1 to 7, wherein the light blocking plate is a stop for stopping a light beam inside the lens barrel.   The lens unit according to claim 8, wherein the stop is made of metal.   The lens unit according to any one of claims 1 to 7, wherein the light shielding plate is a light shielding sheet for shielding unnecessary light.   A light-shielding plate disposed between lenses in a barrel portion of a lens barrel that accommodates a lens of a lens unit, and an outer peripheral portion of the light-shielding plate, which is disposed between the lens portion and an inner peripheral surface of the tubular portion when housed in the tubular portion. A light-shielding plate comprising a deformable portion that is deformed according to a contact state.

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