JP2009244773A - Lens assembly and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens assembly which is miniaturized, and to provide an imaging apparatus. <P>SOLUTION: A male screw 12a formed at a part corresponding to a circumferential part of a taking lens 11 on an outer surface of a lens barrel 12 is screwed in a female screw 13a formed on an inner surface of a press ring 13, thereby the press ring 13 is fixed to the lens barrel 12. Also, a male screw 13b formed on an outer surface of the press ring 13 is screwed in a female screw 14a formed in a lens holder 14, thereby the lens holder 14 is fixed to the press ring 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lens assembly in which a lens for imaging subject light is formed on an imaging device, and an imaging apparatus including the lens assembly.

  Conventionally, a photographic lens that forms an image of subject light on an image sensor such as a CCD image sensor, a lens barrel that accommodates the photographic lens, and a presser ring that presses a peripheral edge of the photographic lens accommodated in the lens barrel, A lens assembly including a lens holder to which the image sensor is attached is known.

  FIG. 10 is a perspective view of the conventional lens assembly, with a part of the structure before the lens holder is attached cut away.

  FIG. 10 shows a photographic lens 101 that constitutes the lens assembly 100, a lens barrel 102 that houses the photographic lens 101, and a presser ring 103 that presses the peripheral edge of the photographic lens 101. The presser ring 103 is provided on the inner wall surface of the barrel 102 on the rear end side opposite to the front end side on which the subject light A is incident. More specifically, a male screw 103 a is formed on the outer wall surface of the presser ring 103, and a female screw 102 a is formed on the rear end side of the inner wall surface of the lens barrel 102. The presser ring 103 is fixed to the rear end side of the inner wall surface of the lens barrel 102 by screwing the screw 103a. A male screw 102 b is formed on the outer wall surface of the lens barrel 102.

  FIG. 11 is a perspective view of the lens assembly shown in FIG. 10 with a part of the structure after the lens holder is attached cut away.

FIG. 11 shows a lens assembly 100 including the photographing lens 101, the lens barrel 102, the presser ring 103, and the lens holder 104 attached to the lens barrel 102.
The lens holder 104 actually has a front frame for attaching the lens holder 104 to the lens barrel 102 and a rear frame for attaching the image pickup device. However, only the front frame of the lens holder 104 is shown here for convenience. Show. A female screw 104 a is formed on the inner wall surface of the front frame of the lens holder 104, and a male screw 102 b formed on the outer wall surface of the lens barrel 102 is screwed into the female screw 104 a, whereby A lens holder 104 is attached.

  FIG. 12 is a perspective view showing a lens assembly different from the conventional lens assembly shown in FIGS. 10 and 11, with a part of the structure before the lens holder is attached cut away.

  FIG. 12 shows a photographic lens 201 constituting the lens assembly 200, a lens barrel 202 that houses the photographic lens 201, and a presser ring 203 that presses the peripheral edge of the photographic lens 201. The presser ring 203 is provided on the rear end side of the outer wall surface of the barrel 202 opposite to the front end side on which the subject light A is incident. Specifically, a male screw 202a is formed on the rear end side of the outer wall surface of the lens barrel 202 corresponding to the peripheral edge portion, and a female screw 203a is formed on the inner wall surface of the presser ring 203. When the male screw 202a is screwed into 203a, the presser ring 203 is fixed to the rear end side of the outer wall surface of the lens barrel 202. A male screw 202b is formed on the outer wall surface of the lens barrel 202 on the front end side excluding the rear end side on which the presser ring 203 is fixed.

  FIG. 13 is a perspective view of the lens assembly shown in FIG. 12 with a part of the structure after the lens holder is attached cut away.

  FIG. 13 shows a lens assembly 200 including the photographing lens 201, the lens barrel 202, the presser ring 203, and the lens holder 204 attached to the lens barrel 202. Specifically, a female screw 204a is formed on the inner wall surface of the lens holder 204, and a male screw 202b formed on the front end side of the outer wall surface of the lens barrel 202 is screwed into the female screw 204a. A lens holder 204 is attached to the tube 202.

  The lens assemblies 100 and 200 described above are expected to be applied to in-vehicle cameras and the like, and can be ultra-miniaturized, so that they are mounted on portable devices such as mobile phones that are becoming increasingly smaller and thinner. There is expected.

Further, Patent Document 1 discloses a lens including a lens barrel body that can share various wide-angle lenses having different angles of view (outer diameters), and a pressing member that presses the wide-angle lens held by the lens barrel body. An assembly has been proposed. According to this lens assembly, when incorporating lenses having different angles of view, not only the inside of the lens barrel body but also the front end surface of the lens barrel body is used as an arrangement space. Compared with a case where a plurality of lens seats are provided so as to match, the size of the lens barrel body in the optical axis direction can be kept short.
JP 2007-279557 A

  In the conventional lens assembly 100 described above, it is necessary to form a female screw 102 a for fixing the presser ring 103 on the rear end side of the inner wall surface of the lens barrel 102. For this reason, the dimension of the lens barrel 102 in the optical axis direction needs to be longer by the space for forming the female screw 102a (the fitting length of the presser ring). Therefore, there is a problem that it is not miniaturized.

  Further, in the conventional lens assembly 200, it is necessary to form a male screw 202b for attaching the lens holder 204 on the front end side of the outer wall surface of the lens barrel 202. For this reason, since the female screw 204a of the lens holder 204 must be formed on the front end side of the lens holder, the size of the lens holder 204 becomes large. Therefore, the lens assembly 200 also has a problem that it is not miniaturized.

  Furthermore, since the lens assembly proposed in Patent Document 1 has a structure in which a pressing member is coupled to the lens barrel body, the dimension of the lens barrel body in the optical axis direction is a space for coupling the pressing member. Longer dimensions are required. Therefore, there is still a problem that it is lacking in miniaturization.

  In view of the above circumstances, an object of the present invention is to provide a lens assembly and an imaging apparatus that are reduced in size.

The lens assembly of the present invention that achieves the above object is
A lens,
A lens barrel containing the lens, wherein the first screw is formed on the outer wall surface;
A second screw is formed on the inner wall surface to be engaged with a first screw formed on the outer wall surface of the lens barrel, and a third screw for attaching the lens holder is formed on the outer wall surface. A presser ring for pressing the peripheral edge of the accommodated lens is provided.

  In the lens assembly of the present invention, the first ring formed on the outer wall surface of the lens barrel and the second screw formed on the inner wall surface of the presser ring are screwed together to fix the presser ring to the lens barrel. In addition, the lens holder is attached to the presser ring with a third screw formed on the outer wall surface of the presser ring. According to this configuration, since the presser ring is fixed to a portion of the outer wall surface of the lens barrel corresponding to the peripheral portion of the lens, a conventional female screw for fixing the presser ring to the inner wall surface of the lens barrel is provided. Compared with the technique to form, the dimension to an optical axis direction can be shortened by the space for forming the said internal thread (the fitting length of a press ring). Further, according to this configuration, since the lens holder is attached to the outer wall surface of the presser ring corresponding to the peripheral portion of the lens, the lens holder is attached to the front end side of the conventional outer wall surface of the lens barrel. In comparison with the technique for forming the male screw, the dimension in the optical axis direction can be kept short by the space for forming the male screw (the fitting length of the lens holder). Furthermore, compared with the technique proposed in Patent Document 1 in which the pressing member is coupled to the lens barrel body, the dimension in the optical axis direction can be shortened by the space for coupling the pressing member. Accordingly, the lens assembly can be reduced in size.

Here, the lens barrel includes a cylindrical first sliding member that is in sliding contact with the inner wall surface of the presser ring when the first screw is formed on the outer wall surface and the presser ring is screwed to the outer wall surface. Has a tangent surface,
The presser ring has an annular shape in which the second screw is formed on the inner wall surface, and the inner wall surface is in sliding contact with the first sliding contact surface of the lens barrel when screwed into the lens barrel. It is preferable to have a second sliding contact surface.

  In fixing the presser ring to the outer wall surface of the barrel, the first screw formed on the outer wall surface of the barrel is simply screwed into the second screw formed on the inner wall surface of the presser ring. , The mounting accuracy of the lens holder attached to the outer wall surface of the presser ring is lowered due to the backlash generated between the second screws. Then, an error occurs between the imaging element attached to the lens holder and the lens. Therefore, a slide contact surface is provided on the outer wall surface of the lens barrel and a slide contact surface is provided on the inner wall surface of the presser ring, and the slide contact surfaces are brought into sliding contact with each other, thereby suppressing play between the lens barrel and the presser ring. be able to. By doing in this way, the attachment precision of the lens holder attached to the outer wall surface of a presser ring can be improved.

  Further, the presser ring has a screw lock adhesive hole that penetrates between the inner peripheral surface and the outer peripheral surface, and that the opening opened on the outer peripheral surface is larger than the opening opened on the inner peripheral surface. This is also a preferred embodiment.

  In this way, even when the amount of adhesive injected is large, the large opening of the screw lock adhesive hole plays the role of an adhesive reservoir, and the adhesive overflows from the screw lock adhesive hole and presses. Adhering to the outer wall surface of the ring is prevented from hindering the attachment of the lens holder. Accordingly, when the adhesive is injected, it is not necessary to finely adjust the injection amount of the adhesive, and the workability of the lens assembly can be improved.

  Further, it is preferable that the presser ring has a screw lock adhesive groove that opens on both the inner peripheral surface and the outer peripheral surface, extends in the optical axis direction of the lens, and has one end reaching the end surface of the presser ring.

  With such a screw lock adhesive groove, the adhesive can be injected from the end face side of the presser ring in a state where the lens holder is attached to the outer wall surface of the presser ring. Accordingly, the lens barrel, the presser ring, and the lens holder can be bonded simultaneously, and the workability of the lens assembly can be improved.

  Moreover, it is also a preferable aspect that the second screw formed on the inner wall surface of the presser ring and the third screw formed on the outer wall surface of the presser ring are formed as reverse screws.

  As described above, when the second screw and the third screw are formed as opposite screws, it is possible to remove only the lens barrel from the lens assembly by rotating the lens barrel in a predetermined rotation direction. Only the lens holder can be removed from the lens assembly by rotating the lens in a direction opposite to the predetermined rotation direction. Therefore, the lens assembly can be freely disassembled.

  Furthermore, it is also preferable that the presser ring has a cramp groove for screwing the presser ring into the lens holder when the lens holder is attached.

  In this way, in assembling the lens assembly, a jig is inserted into the cramp groove of the presser ring that rotates in a predetermined direction and is fixed to the lens barrel, and is fixed by rotating the presser ring. The lens holder can be fixed to the presser ring without the presser ring loosening with respect to the lens barrel.

  Further, it is preferable that the lens holder further includes a fourth screw into which a third screw formed on the outer wall surface of the presser ring is screwed.

  If it does in this way, a lens holder can be easily attached to a presser ring.

  An image pickup apparatus according to the present invention that achieves the above object includes the lens assembly and an image pickup apparatus.

  Since the image pickup apparatus of the present invention includes the lens assembly, the size of the image pickup apparatus is reduced.

  According to the present invention, it is possible to provide a lens assembly and an imaging apparatus that are reduced in size.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view of the lens assembly according to the first embodiment of the present invention, with a part of the structure before the lens holder is attached cut away.

  FIG. 1 shows a photographic lens 11 constituting the lens assembly 10 of the first embodiment of the present invention, a lens barrel 12 that houses the photographic lens 11, and a presser ring 13 that holds the peripheral edge of the photographic lens 11. It is shown.

  On the outer wall surface of the lens barrel 12, a male screw 12a (corresponding to an example of the first screw in the present invention) is formed. Further, the presser ring 13 has a female screw 13a (corresponding to an example of the second screw in the present invention) that is engaged with the inner wall surface of the presser ring 13 with the male screw 12a formed on the outer wall surface of the lens barrel 12. ) Is formed. Specifically, a male screw 12 a is formed on a portion of the outer wall surface of the lens barrel 12 corresponding to the peripheral edge of the photographic lens 11, and this male screw 12 a is a female screw formed on the inner wall surface of the presser ring 13. The presser ring 13 is fixed to the lens barrel 12 by being screwed into 13a. Further, the presser ring 13 has a male screw 13b (corresponding to an example of a third screw in the present invention) for mounting a lens holder 14 to be described later formed on the outer wall surface of the presser ring 13.

  FIG. 2 is a perspective view of the lens assembly shown in FIG. 1 with a part of the structure after the lens holder is attached cut away.

  FIG. 2 shows a lens assembly 10 including the photographing lens 11, the lens barrel 12, the presser ring 13, and the lens holder 14 attached to the outer wall surface of the presser ring 13. The lens holder 14 actually has a front frame for attaching the lens holder 14 to the presser ring 13 and a rear frame for attaching the image pickup device, but only the front frame of the lens holder 14 is shown here for convenience. Show. On the inner wall surface of the front frame of the lens holder 14, a female screw 14a (corresponding to an example of the fourth screw in the present invention) into which a male screw 13b formed on the outer wall surface of the presser ring 13 is screwed is formed. Yes. The lens holder 14 is attached to the presser ring 13 by the male screw 13 b formed on the outer wall surface of the presser ring 13 being screwed into the female screw 14 a.

  In the lens assembly 10 of the first embodiment, the presser ring 13 is fixed to a portion of the outer wall surface of the lens barrel 12 corresponding to the peripheral edge portion of the photographic lens 11, so that the conventional inner wall surface of the lens barrel is fixed. Compared to a technique for forming a female screw for fixing the presser ring, the dimension in the optical axis direction can be shortened by the space for forming the female screw (the length of the presser ring fitted). . In addition, since the lens holder 14 is attached to a portion of the outer wall surface of the presser ring 13 corresponding to the peripheral edge portion of the photographing lens 11, the lens holder is attached to the front end side of the outer wall surface of the conventional barrel. In comparison with the technique for forming the male screw, the dimension in the optical axis direction can be kept short by the space for forming the male screw (the fitting length of the lens holder). Furthermore, compared with the technique proposed in Patent Document 1 in which the pressing member is coupled to the lens barrel body, the dimension in the optical axis direction can be shortened by the space for coupling the pressing member. Therefore, the lens assembly 10 can be reduced in size.

  FIG. 3 is a perspective view showing the lens assembly according to the second embodiment of the present invention by cutting away a part of the structure before the lens holder is attached.

  Compared with the lens assembly 10 shown in FIG. 1, the lens assembly 20 shown in FIG. 3 is obtained by replacing the lens barrel 12 and the presser ring 13 shown in FIG. 1 with a lens barrel 22 and a presser ring 22 described below. Is different.

  The lens barrel 22 has a male screw 22a (corresponding to another example of the first screw in the present invention) formed on the outer wall surface thereof. The lens barrel 22 is in sliding contact with the rear end portion of the inner wall surface of the presser ring 23 when the presser ring 23 is screwed to the rear end portion of the outer wall surface excluding the portion where the male screw 22a is formed. It has a cylindrical sliding contact surface 22b (corresponding to an example of the first sliding contact surface in the present invention).

  The presser ring 23 has a female screw 23a (corresponding to another example of the second screw in the present invention) formed on the inner wall surface, and a portion of the inner wall surface where the female screw 23a is formed. An annular slidable contact surface 23b that slidably contacts the slidable contact surface 22b of the lens barrel 22 when screwed into the lens barrel 22 at the rear end portion (except for the second slidable contact surface according to the present invention) Have

  In the lens assembly 20 of the second embodiment, the male screw 22a formed on the outer wall surface of the lens barrel 22 is screwed into the female screw 23a formed on the inner wall surface of the presser ring 23, whereby the presser ring 23 is formed. The lens barrel 22 is fixed to the outer wall surface. Here, if the male screw 22a is simply screwed into the female screw 23a, a lens holder (see FIG. 5) that is attached to the outer wall surface of the presser ring 23 due to looseness generated between the male screw 22a and the female screw 23a. (Not shown) mounting accuracy decreases. Then, an error occurs between the imaging element attached to the lens holder and the photographic lens 21. Therefore, in the lens assembly 20 of the second embodiment of the present invention, the sliding contact surface 22b is provided on the outer wall surface of the lens barrel 22, and the sliding contact surface 23b is provided on the inner wall surface of the presser ring 23. The sliding contact surfaces 23b are brought into sliding contact with each other, thereby suppressing backlash between the lens barrel 22 and the presser ring 23. By doing in this way, the attachment precision of the lens holder attached to the outer wall surface of the presser ring 23 can be improved.

  FIG. 4 is a perspective view showing a lens assembly according to a third embodiment of the present invention by cutting away a part of the structure before the lens holder is attached.

  The lens assembly 30 shown in FIG. 4 is different from the probe assembly 20 shown in FIG. 3 in that the presser ring 23 is replaced with a presser ring 33.

  In addition to the constituent elements of the presser ring 23 shown in FIG. 3, the presser ring 33 shown in FIG. 4 penetrates between the inner peripheral surface and the outer peripheral surface and opens to the outer peripheral surface rather than the opening 33 a 1 that opens to the inner peripheral surface. The opening 33a2 has a screw lock bonding hole 33a which is a larger opening (a two-stage opening (or a tapered opening)).

  In the lens assembly 30 of the third embodiment, the male screw 22a formed on the outer wall surface of the lens barrel 22 is screwed into the female screw 23a formed on the inner wall surface of the presser ring 33, whereby the presser ring 33 is formed. While being fixed to the outer wall surface of the lens barrel 22, the sliding contact surface 22 b provided on the outer wall surface of the lens barrel 22 and the sliding contact surface 23 b provided on the inner wall surface of the presser ring 33 are in sliding contact with each other. In this state, an adhesive is further injected into the screw lock bonding hole 33 a of the presser ring 33, whereby the presser ring 33 is screw-locked to the lens barrel 22. Here, even when the injection amount of the adhesive is large, the large opening 33a2 of the screw lock adhesive hole 33a serves as an adhesive reservoir, and the adhesive overflows from the screw lock adhesive hole 33a. Adhering to the outer wall surface of the presser ring 33 is prevented from hindering the attachment of the lens holder. In addition, the small opening 33a1 is an opening that can inject an amount of an adhesive that can maintain a sufficient adhesive strength when the lens barrel 22 and the presser ring 33 are bonded. Accordingly, when the adhesive is injected, it is not necessary to finely adjust the injection amount of the adhesive, and the workability of the lens assembly 30 can be improved.

  FIG. 5 is a perspective view showing a lens assembly according to a fourth embodiment of the present invention by cutting away a part of the structure before the lens holder is attached.

  5 is a screw lock that opens on both the inner peripheral surface and the outer peripheral surface and extends in the optical axis direction of the photographic lens 11 and has one end reaching the end surface 43a of the presser ring 43. The adhesive groove 43b is provided.

  FIG. 6 is a perspective view of the lens assembly shown in FIG. 5 with a part thereof cut away after the lens holder is attached.

  6 shows a lens assembly 40 including a lens holder 14 attached to the outer wall surface of the presser ring 43 shown in FIG.

  In the lens assembly 40 of the fourth embodiment, a presser ring 43 having a screw lock adhesive groove 43 b that reaches one end surface 43 a of the presser ring 43 is provided. Therefore, as shown in FIG. 6, the adhesive can be injected from the end face 43 a side of the presser ring 43 with the lens holder 14 attached to the outer wall surface of the presser ring 43. By doing in this way, adhesion with the lens barrel 22, the presser ring 43, and the lens holder 14 can be performed simultaneously. Therefore, the workability of the lens assembly 40 can be improved. As shown in FIG. 5, the adhesive is injected for the first time with the presser ring 43 attached to the outer wall surface of the lens barrel 22 to bond the lens barrel 22 and the presser ring 43, and then FIG. The second injection of the adhesive is performed with the lens holder 14 being attached to the outer wall surface of the presser ring 43 as shown in FIG. 2, and the adhesive is injected such that the presser ring 43 and the lens holder 14 are bonded. It may be performed in two steps.

  FIG. 7 is a perspective view showing a lens assembly according to a fifth embodiment of the present invention by cutting away a part of the structure before the lens holder is attached. FIG. 8 is a perspective view showing the lens assembly shown in FIG. 7 with a part thereof cut away after the lens holder is attached.

  A female ring 53a (corresponding to another example of the second screw according to the present invention) is formed on the inner wall surface of the presser ring 53 constituting the lens assembly 50 shown in FIG. The presser ring 53 has a male screw 53b (corresponding to another example of the third screw according to the present invention) formed on the outer wall surface thereof. The female screw 53a and the male screw 53b are formed as reverse screws. Further, the presser ring 53 has a crimping groove 53c for screwing the presser ring 53 into the lens holder 14 when the lens holder 14 shown in FIG.

  In assembling the lens assembly 50, the presser ring 53 is fixed to the lens barrel 22 in the first step. Specifically, as shown in FIG. 7, the presser ring 53 is rotated clockwise P while the lens barrel 22 is fixed, and the male screw 22 a formed on the outer wall surface of the lens barrel 22 is attached to the presser ring 53. Screw into a female screw 53a formed on the inner wall surface. Next, in the second step, the lens holder 14 is fixed to the presser ring 53 as shown in FIG. Specifically, a jig is inserted into the crimping groove 53 c of the presser ring 53, the presser ring 53 is rotated counterclockwise Q with the jig, and the male screw 53 b formed on the outer wall surface of the presser ring 23 is Screw into a female screw 14 a formed on the inner wall surface of the lens holder 14. Thus, in the second step, a jig is inserted into the crimping groove 53c of the presser ring 53 so that the presser ring 23 fixed in the clockwise direction P in the first step does not loosen with respect to the lens barrel 22. Then, the presser ring 53 is rotated in the counterclockwise direction Q together with the lens barrel 22, and the lens holder 14 is fixed to the presser ring 53. In this way, the lens assembly 50 is assembled.

  When it is desired to remove only the lens barrel 22 from the assembled lens assembly 50, only the lens barrel 22 can be removed from the lens assembly 50 by rotating the lens barrel 22 in the counterclockwise direction Q. When only the lens holder 14 is to be removed from the assembled lens assembly 50, only the lens holder 14 can be removed from the lens assembly 50 by rotating the lens barrel 22 in the clockwise direction P.

  As described above, in the lens assembly 50 according to the fifth embodiment, the female screw 53a formed on the inner wall surface of the presser ring 53 and the male screw 53b formed on the outer wall surface of the presser ring 53 are mutually reversed. Is formed. Therefore, only the lens barrel 22 can be removed from the lens assembly 50 by rotating the lens barrel 22 in the counterclockwise direction Q. Further, by rotating the lens barrel 22 in the clockwise direction P, only the lens holder 14 can be removed from the lens assembly 50. Therefore, the lens assembly 50 can be disassembled freely.

  Further, as described above, since the presser ring 53 has the crimping groove 53c for screwing the presser ring 53 into the lens holder 14, when the lens assembly 50 is assembled, first, the presser ring 23 is moved clockwise P. The jig is rotated and fixed to the lens barrel 22, and then a jig is inserted into the crimp groove 53 c of the presser ring 53 to rotate the presser ring 53 in the counterclockwise direction Q. In this way, the lens holder 14 can be fixed to the presser ring 53 without the presser ring 23 fixed in the clockwise direction P being loosened with respect to the lens barrel 22.

  FIG. 9 is a perspective view showing a cross section of a camera unit including the lens assembly shown in FIG.

  A camera unit 60 shown in FIG. 9 is an embodiment of the imaging apparatus according to the present invention. The camera unit 60 includes the lens assembly 20, the lens holder 61, the imaging element 62, and the substrate 63 shown in FIG. And are provided.

  To assemble the camera unit 60, a lens holder 61 is attached to the lens assembly 20, and a substrate 63 on which an image pickup device 62 such as a CCD is mounted is bonded and fixed to the lens holder 61. According to the camera unit 60, since the lens assembly 20 is provided, the camera unit 60 is miniaturized.

It is a perspective view which notches and shows a part of structure before a lens holder is attached of the lens assembly of 1st Embodiment of this invention. It is a perspective view which notches and shows a part of structure after the lens holder of the lens assembly shown in FIG. 1 was attached. It is a perspective view which notches and shows a part of structure before the lens holder is attached of the lens assembly of 2nd Embodiment of this invention. It is a perspective view which notches and shows a part of structure before a lens holder is attached of the lens assembly of 3rd Embodiment of this invention. It is a perspective view which notches and shows a part of structure before the lens holder is attached of the lens assembly of 4th Embodiment of this invention. FIG. 6 is a perspective view showing the lens assembly shown in FIG. 5 with a part thereof cut away after the lens holder is attached. It is a perspective view which notches and shows a part of structure before a lens holder is attached of the lens assembly of 5th Embodiment of this invention. It is a perspective view which notches and shows a part of structure after the lens holder of the lens assembly shown in FIG. 7 was attached. It is a perspective view which shows the cross section of the camera unit provided with the lens assembly shown in FIG. It is a perspective view which notches and shows a part of structure before the lens holder of a conventional lens assembly is attached. It is a perspective view which notches and shows a part of structure after the lens holder of the lens assembly shown in FIG. 10 was attached. FIG. 12 is a perspective view of a conventional lens assembly different from the lens assembly shown in FIGS. 10 and 11, with a part of the structure before the lens holder is attached cut away. It is a perspective view which notches and shows a part of structure after the lens holder of the lens assembly shown in FIG. 12 was attached.

Explanation of symbols

10, 20, 30, 40, 50 Lens assembly 11 Shooting lens 12, 22 Lens barrel 12a, 13b, 22a, 53b Male thread 13, 23, 33, 43, 53 Press ring 13a, 14a, 23a, 53a Female thread 14 , 61 Lens holder 22b, 23b Sliding contact surface 33a Screw lock adhesive hole 33a1, 33a2 Opening 43a Presser ring end surface 43b Screw lock adhesive groove 53c Crimp groove 60 Camera unit 62 Image sensor 63 Substrate

Claims (8)

A lens,
A lens barrel containing the lens, the first screw formed on the outer wall surface;
A second screw is formed on the inner wall surface to be engaged with a first screw formed on the outer wall surface of the lens barrel, and a third screw for attaching the lens holder is formed on the outer wall surface. A lens assembly comprising a presser ring that presses a peripheral edge of a lens accommodated therein. The lens barrel has a cylindrical first sliding contact surface that is in sliding contact with the inner wall surface of the presser ring when the first screw is formed on the outer wall surface and the presser ring is screwed to the outer wall surface. Have
The presser ring has an annular shape in which the second screw is formed on the inner wall surface and is in sliding contact with the first sliding contact surface of the lens barrel when the second screw is screwed onto the lens barrel. The lens assembly according to claim 1, further comprising a second sliding contact surface.   The presser ring has a screw-lock adhesive hole that penetrates between the inner peripheral surface and the outer peripheral surface, and the opening opened in the outer peripheral surface is larger than the opening opened in the inner peripheral surface. The lens assembly according to claim 1 or 2, characterized in that:   2. The presser ring has an adhesive groove for screw lock that opens on both an inner peripheral surface and an outer peripheral surface, extends in the optical axis direction of the lens, and has one end reaching an end surface of the presser ring. Or the lens assembly of 2.   2. The second screw formed on the inner wall surface of the presser ring and the third screw formed on the outer wall surface of the presser ring are formed as mutually reverse screws. 5. The lens assembly according to claim 1.   6. The lens assembly according to claim 5, wherein the presser ring has a cramp groove for screwing the presser ring into the lens holder when the lens holder is attached.   The lens holder according to any one of claims 1 to 6, further comprising a lens holder formed with a fourth screw into which a third screw formed on the outer wall surface of the presser ring is screwed. Lens assembly.   An imaging apparatus comprising: the lens assembly according to claim 1; and an imaging element.

Images