JP2007322548A - Lens fixing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens fixing structure which can certainly fix a lens to a lens barrel and can certainly prevent positional displacement of the lens from occurring due to loosening of lens fixation by vibration or the like in lens carrying equipment such as a camera and a telescope. <P>SOLUTION: A thread groove 11 and an inner pawl 13 are provided at an outer circumferential surface of an inner cylinder 10. A thread groove 21 and an outer pawl 23 are provided at an inner peripheral surface of an outer cylinder 20 and a lens pressing part 22 is provided at one end thereof. The lens 1 is brought into contact with an end face of a minus side of the inner cylinder 10, the outer cylinder 20 is put thereon and then is rotated to join the thread groove 11 with the thread groove 21 by screw connection. At a final stage of the screw connection, the inner pawl 13 is engaged with the outer pawl 23 to restrain the inner cylinder 10 and the outer cylinder 20 so as to be unable to rotate in a reverse direction. Thus the lens 1 is fixed by being held between the end face of the minus side of the inner cylinder 10 and the lens pressing part 22 of the outer cylinder 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lens fixing structure capable of reliably fixing a lens in an apparatus having a lens such as a camera or a telescope.

  FIG. 7 is a schematic cross-sectional view showing a configuration of a conventional lens fixing structure. In the figure, reference numeral 1 denotes a lens having a substantially disk shape and having a convex surface on one side. The lens 1 is held and fixed by an inner cylinder 110 and an outer cylinder 120 forming a lens barrel, and condenses light, for example, on a CCD (not shown). The inner cylinder 110 is a cylinder having an outer diameter substantially equal to the diameter of the lens 1, and a thread groove 111 is formed on the outer peripheral surface. The outer cylinder 120 is a cylinder whose inner diameter is substantially equal to the outer diameter of the inner cylinder 110. At one end of the outer cylinder 120, the lens pressing portion 122 is directed inward so as to narrow the diameter of the opening over the entire circumference of the opening. Is provided in a bowl shape. Further, a screw groove 121 that is screwed into the screw groove 111 of the inner cylinder 110 is formed on the inner peripheral surface of the outer cylinder 120 on the other end side.

  The other surface (the surface on the non-convex surface) of the lens 1 is brought into contact with one end of the inner tube 110, and the outer tube 120 is placed on the lens 1 and the inner tube 110 from the side where the screw groove 121 is provided, and the outer tube 120 is rotated. By screwing the screw groove 111 of the inner cylinder 110 and the screw groove 121 of the outer cylinder 120, the lens 1 can be fixed by being sandwiched between one end of the inner cylinder 110 and the lens pressing portion 122 of the outer cylinder 120. It is. The lens 1 is firmly fixed by screwing the screw groove 111 of the inner cylinder 110 and the screw groove 121 of the outer cylinder 120.

  In addition, the lens is not fixed by screwing the thread groove, but by molding the outer cylinder and the inner cylinder with no thread groove formed of synthetic resin, and heating and welding the outer cylinder and the inner cylinder. There is a method to fix firmly. Furthermore, there is a method of bonding the outer cylinder and the inner cylinder with an adhesive.

In Patent Document 1, the front end portion and the rear end portion are threaded, and the front end portion is screwed into the fastened product, and the outer periphery of the surface that is slidably fitted in the axial direction of the bolt and is in contact with the fastened product A rotation stop disk having a tooth row at the part, a tooth row meshing with the tooth row of the rotation stop disk, screwed into the restraint body fixed to the product to be fastened, and the rear end portion of the bolt, There has been proposed a bolt having a detent mechanism including a nut that presses a retaining disk against a product to be fastened. In the bolt having this anti-rotation mechanism, the front end portion of the bolt is first screwed into the fastened product, and then the nut is screwed into the rear end portion of the bolt so that the non-rotating disk is engaged with the restraint body of the fastened product. Therefore, it is possible to prevent the bolt from rotating in the loosening direction.
JP-A-9-196043

  When the lens fixing structure shown in FIG. 7 is used, for example, for the purpose of fixing a lens of an in-vehicle camera mounted on a vehicle, the screw groove 111 of the inner cylinder 110 and the screw groove of the outer cylinder 120 are caused by vibration caused by traveling of the vehicle. There is a possibility that the screwing of 121 is loosened and the fixing position of the lens 1 is shifted.

  Moreover, when heating and welding an outer cylinder and an inner cylinder, the installation for a heating is required and since a heating process is required, there exists a problem that the man-hour of a manufacturing process increases and cost increases. Similarly, when the outer cylinder and the inner cylinder are bonded with an adhesive, a facility for applying the adhesive and the adhesive is required, and an adhesive application process is required, which increases the number of manufacturing steps and increases the cost. There is a problem of doing.

  When the anti-rotation mechanism used for the bolt having the anti-rotation mechanism described in Patent Document 1 is applied to the anti-rotation of the inner cylinder 110 and the outer cylinder 120 of the lens fixing structure shown in FIG. Since parts such as disks and bolts are necessary, the number of parts increases, the cost increases, and the size of the lens barrel increases. Also, since the bolt does not have a detent mechanism, if the bolt is loosened, there is a risk that the detent will be released by the detent disc, and the accuracy of the detent will be affected by the tightening of the bolt. There is a problem that.

  The present invention has been made in view of such circumstances. The object of the present invention is to provide a first cylindrical body (inner cylinder) in which a thread groove is formed on the outer peripheral surface and a thread groove on the inner peripheral surface. When the second cylinder (outer cylinder) formed with a screw is screwed and fixed with the lens sandwiched, a first claw portion is provided on the outer peripheral surface of the first cylinder, and the second cylinder A second claw portion is provided on the inner peripheral surface of the first claw portion, and the first claw portion and the second claw portion are engaged with each other to rotate in a direction to release the screwing of the first cylinder body and the second cylinder body. An object of the present invention is to provide a lens fixing structure capable of easily and reliably fixing a lens by adopting a locking configuration.

  Another object of the present invention is to provide a first cylindrical body and a first cylindrical body by arranging a plurality of first claw portions along the circumferential direction on the outer peripheral surface of the first cylindrical body. Provided is a lens fixing structure capable of easily engaging the first claw portion and the second claw portion regardless of the rotation position of the first cylinder body as the second cylinder body is screwed together. There is to do.

  According to another object of the present invention, a plurality of second claw portions are juxtaposed along the circumferential direction on the inner peripheral surface of the second cylinder, so that the first cylinder and A lens fixing structure capable of easily engaging the first claw portion and the second claw portion regardless of the rotation position of the second cylinder body with the rotation of screwing the second cylinder body. It is to provide.

  Another object of the present invention is to provide a first claw portion and a second claw portion on the opposite side of the position where the lens is sandwiched with the thread groove therebetween, so that the first claw portion is provided. An object of the present invention is to provide a lens fixing structure in which a cylindrical body and a second cylindrical body can be easily screwed together.

  Another object of the present invention is that the second claw portion is provided on the second cylinder so that the innermost portion of the second claw portion is outside the outermost portion of the thread groove. By doing so, the second claw portion and the first claw portion engaged with the second claw portion provide a lens fixing structure that does not hinder when the first cylinder and the second cylinder are screwed together. is there.

  Another object of the present invention is to make the first claw portion and the second claw portion in the axial direction by making the first claw portion wider than the second claw portion in the axial direction. It is an object of the present invention to provide a lens fixing structure capable of reliably fixing a lens even when the engagement position of the lens is slightly shifted.

  Another object of the present invention is to make the first claw portion and the second claw portion in the axial direction by making the second claw portion wider than the first claw portion in the axial direction. It is an object of the present invention to provide a lens fixing structure capable of reliably fixing a lens even when the engagement position of the lens is slightly shifted.

  Another object of the present invention is to provide water or the like into the cylinder of the first cylinder by providing a sealing ring at the contact portion between the first cylinder and the lens. It is in providing the lens fixing structure which can prevent.

  The lens fixing structure according to the first aspect of the present invention is the first cylindrical body having a thread groove formed on the outer peripheral surface, and the first groove body screwed into the thread groove of the first cylindrical body is formed on the inner peripheral surface. And a lens pressing portion provided on the second cylinder and abutted on an edge portion of one surface of the lens coaxially accommodated in the second cylinder, the first cylinder The body and the second cylinder are rotated and screwed together along the screw groove, and the lens is fixed between the one end portion of the first cylinder and the lens pressing portion of the second cylinder. In the lens fixing structure, the first claw portion provided on the outer peripheral surface of the first cylindrical body and the inner peripheral surface of the second cylindrical body are engaged with the first claw portion. And a second claw portion that locks rotation in a direction in which the screwing of the first cylinder body and the second cylinder body is released, and the engagement between the first claw portion and the second claw portion. As a result, Wherein the serial are lens impossible releasably secure.

  In the present invention, the first cylindrical body having the thread groove formed on the outer peripheral surface and the second cylindrical body having the lens pressing portion provided with the thread groove formed on the inner peripheral surface are screwed together. A lens is sandwiched and fixed to one end portion of the first cylindrical body and the lens pressing portion of the second cylindrical body. Furthermore, a first claw is provided on the outer peripheral surface of the first cylinder, and the first cylinder and the second cylinder are engaged with the first claw on the inner peripheral surface of the second cylinder. A second claw portion that locks the rotation in the direction of releasing the body screwing is provided. As the first cylinder and the second cylinder are screwed together by rotation, the first claw portion and the second claw portion are engaged, and the rotation in the opposite direction is impossiblely locked. Therefore, it is possible to prevent the screwing of the first cylinder and the second cylinder from being loosened.

  Further, the lens fixing structure according to the second invention is characterized in that a plurality of the first claw portions are arranged in parallel along the circumferential direction on the outer peripheral surface of the first cylindrical body.

  In this invention, the 1st nail | claw part is arranged in multiple numbers along the circumferential direction on the outer peripheral surface of a 1st cylinder. When the first cylindrical body and the second cylindrical body are screwed together, any one of the plurality of first claw portions is the first regardless of the circumferential position of the first cylindrical body with respect to the second cylindrical body. Engage with the two claws. Thereby, the rotation to the direction which cancels | releases the 1st cylinder and the 2nd cylinder can be prevented more reliably.

  Further, the lens fixing structure according to the third invention is characterized in that a plurality of the second claw portions are arranged in parallel along the circumferential direction on the inner peripheral surface of the second cylindrical body.

  In the present invention, a plurality of second claw portions are juxtaposed along the circumferential direction on the inner peripheral surface of the second cylindrical body. When the first cylindrical body and the second cylindrical body are screwed together, any one of the plurality of second claw portions is the first regardless of the circumferential position of the second cylindrical body with respect to the first cylindrical body. Engage with one claw. Thereby, the rotation to the direction which cancels | releases the 1st cylinder and the 2nd cylinder can be prevented more reliably.

  In the lens fixing structure according to the fourth aspect of the present invention, the first claw portion is provided on the opposite side of the one end portion with the thread groove of the first cylinder interposed therebetween, and the second claw portion Is provided on the opposite side of the lens pressing portion with the thread groove of the second cylindrical body in between.

  In the present invention, the first cylindrical body is provided with the first claw portion on the opposite side of the one end portion that contacts the lens with the thread groove therebetween. The second cylinder is provided with a second claw portion on the opposite side of the lens pressing portion with a thread groove therebetween. When the lens is fixed with the first cylinder and the second cylinder, in the initial stage of screwing the first cylinder and the second cylinder, the first claw part and the second claw part are It is easy to rotate for screwing without engaging. Further, at the final stage of screwing, the first claw portion and the second claw portion are engaged, and rotation in the opposite direction can be locked.

  The lens fixing structure according to the fifth invention is characterized in that the innermost portion of the second claw portion is positioned outside the outermost portion of the thread groove of the second cylindrical body. To do.

  In this invention, a 2nd nail | claw part is provided in a 2nd cylinder so that the innermost part of a 2nd nail | claw part may become an outer side from the outermost part of a thread groove. Thereby, since the engagement position of the first claw part and the second claw part is outside the screwing position of the screw groove, the first claw part is located on the opposite side of the position where the lens is sandwiched between the screw grooves. And when the 2nd nail | claw part is provided, a 2nd nail | claw part does not become a hindrance to screwing of a thread groove.

  In the lens fixing structure according to the sixth aspect of the invention, the first claw portion has a width dimension in the axial direction larger than a width dimension of the second claw portion.

  In the present invention, the first claw portion is wider than the second claw portion in the axial direction. The first claw and the second claw are engaged at a predetermined position in the axial direction of the first cylinder by the rotation of screwing the first cylinder and the second cylinder. By making the width of the one claw portion wide, the engagement position in the axial direction can be widened. Therefore, it is possible to lock the rotation in the reverse direction from the intermediate stage as well as the final stage of the rotation in which the first cylinder and the second cylinder are screwed together. In addition, even if an error occurs in the shape of the lens, the first cylindrical body, the second cylindrical body, etc., and the engagement positions of the first claw portion and the second claw portion are shifted, the reverse is ensured. Rotation in the direction can be locked.

  The lens fixing structure according to a seventh aspect is characterized in that the second claw portion has a width dimension in an axial direction larger than a width dimension of the first claw portion.

  In the present invention, the second claw portion is wider than the first claw portion in the axial direction. The first claw and the second claw are engaged at a predetermined position in the axial direction of the second cylinder by the rotation of screwing the first cylinder and the second cylinder. By widening the two claw portions, the engagement position in the axial direction can be widened. Therefore, it is possible to lock the rotation in the reverse direction from the intermediate stage as well as the final stage of the rotation in which the first cylinder and the second cylinder are screwed together. In addition, even if an error occurs in the shape of the lens, the first cylindrical body, the second cylindrical body, etc., and the engagement positions of the first claw portion and the second claw portion are shifted, the reverse is ensured. Rotation in the direction can be locked.

  The lens fixing structure according to the eighth invention is characterized in that a sealing ring is provided at a contact portion of the first cylindrical body with the lens.

  In the present invention, a sealing ring is provided at the contact portion between the first cylinder and the lens. Since the contact portion between the first cylinder and the lens is annular, water or the like can be prevented from entering the first cylinder by the sealed ring. In particular, in an in-vehicle camera, when a vehicle travels in rainy weather, rainwater may enter and cause a failure, but this can be prevented.

  In the case of the first invention, the first cylindrical body is provided with the thread groove and the first claw portion, the second cylindrical body is provided with the thread groove and the second claw portion, By engaging the first claw and the second claw, the first cylinder and the second cylinder are configured to lock the rotation in the direction in which the screwing of the first cylinder and the second cylinder is released. As the second cylindrical body is screwed together by rotation, the first claw portion and the second claw portion are engaged, and the rotation in the opposite direction can be locked. Therefore, the lens sandwiched between the first cylinder and the second cylinder can be securely fixed. When this fixing structure is applied to, for example, an in-vehicle camera, the first vibration is caused by vibrations caused by running of the vehicle. Since the screwing of the cylindrical body and the second cylindrical body is not loosened, the lens is not displaced, and the reliability of the in-vehicle camera can be improved.

  Further, in the case of the second invention, the first cylinder with respect to the second cylinder is formed by arranging a plurality of first claw portions along the circumferential direction on the outer peripheral surface of the first cylinder. Regardless of the position of the body in the circumferential direction, any one of the plurality of first claw portions engages with the second claw portion, so that the first claw portion and the second claw portion can be easily engaged. It is possible to reliably prevent the first cylinder and the second cylinder from rotating in the direction of releasing the screwing. Therefore, it is possible to improve the reliability of fixing the lens, and it is possible to improve the reliability of a device to which this fixing structure is applied.

  Further, in the case of the third invention, the second claw portion is arranged side by side along the circumferential direction on the inner peripheral surface of the second cylinder, so that the second cylinder relative to the first cylinder is provided. Regardless of the position of the cylindrical body in the circumferential direction, any one of the plurality of second claw portions engages with the first claw portion, so that the first claw portion and the second claw portion can be easily engaged. Therefore, it is possible to reliably prevent the first cylinder and the second cylinder from rotating in the direction of releasing the screwing. Therefore, it is possible to improve the reliability of fixing the lens, and it is possible to improve the reliability of a device to which this fixing structure is applied.

  According to the fourth aspect of the present invention, the first claw portion and the second claw portion are provided on opposite sides of the position where the lens is sandwiched with the thread groove therebetween, so that the first cylindrical body and In the initial stage of screwing the second cylindrical body, the first claw part and the second claw part are not engaged, and it is easy to rotate for screwing. In the final stage of screwing, The first claw portion and the second claw portion are engaged with each other, and the rotation in the opposite direction can be locked. Therefore, the first cylinder and the second cylinder can be easily screwed together, and the operation of fixing the lens can be easily performed.

  According to the fifth aspect of the present invention, the second claw portion is provided on the second cylindrical body so that the innermost portion of the second claw portion is outside the outermost portion of the thread groove. Since the engagement position of the first claw part and the second claw part is outside the screwing position of the screw groove, the first claw part and the second claw part are located on the opposite side of the position where the lens is sandwiched with the screw groove interposed. When the second claw portion is provided, the second claw portion does not hinder the thread groove from being screwed together. Therefore, the first cylinder and the second cylinder can be easily screwed together, and the operation of fixing the lens can be easily performed.

  Further, in the case of the sixth invention, by making the first claw portion wider than the second claw portion with respect to the axial center direction of the first cylinder, the first cylinder and the second cylinder are formed. Since the rotation in the reverse direction can be stopped not only from the final stage of the rotation to be screwed, the rotation in the reverse direction can be reliably locked. In addition, even if an error occurs in the shape of the lens, the first cylindrical body, the second cylindrical body, etc., and the engagement positions of the first claw portion and the second claw portion are shifted, the reverse is ensured. Since the rotation in the direction can be locked, it is possible to increase the reliability of fixing the lens, and it is possible to improve the reliability of a device to which this fixing structure is applied.

  Further, in the case of the seventh invention, by making the second claw part wider than the first claw part in the axial direction of the second cylinder, the first cylinder and the second cylinder are Since the rotation in the reverse direction can be stopped not only from the final stage of the rotation to be screwed, the rotation in the reverse direction can be reliably locked. In addition, even if an error occurs in the shape of the lens, the first cylindrical body, the second cylindrical body, etc., and the engagement positions of the first claw portion and the second claw portion are shifted, the reverse is ensured. Since the rotation in the direction can be locked, it is possible to increase the reliability of fixing the lens, and it is possible to improve the reliability of a device to which this fixing structure is applied.

  According to the eighth aspect of the invention, by providing a sealing ring at the contact portion between the first cylinder and the lens, water or the like can be prevented from entering the cylinder of the first cylinder. Therefore, the failure occurrence rate of equipment to which this fixed structure is applied can be reduced.

  Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof. FIG. 1 is a schematic cross-sectional view showing a configuration of a lens fixing structure according to the present invention. In the figure, reference numeral 1 denotes a substantially disk-shaped lens. One surface of the lens 1 is a convex surface, and the other surface is a flat surface or a concave surface. The peripheral portion of the lens 1 is flat on both sides.

  The lens 1 is held and fixed by an inner cylinder 10 and an outer cylinder 20 made of a synthetic resin that form a part of the lens barrel. The inner cylinder 10 is a cylinder having an outer diameter substantially equal to the diameter of the lens 1. The end surface on one side of the inner cylinder 10 is configured to contact the flat portion of the periphery of the lens 1 with almost no gap when the other surface of the lens 1 is brought into contact. Further, a connecting cylinder 30 having an outer diameter smaller than that of the inner cylinder 10 is connected to the other end face of the inner cylinder 10. The inner cylinder 10 and the connecting cylinder 30 have substantially the same inner diameter.

  On the outer peripheral surface in the vicinity of the other end of the inner cylinder 10, a plurality of inner claws 13 (details will be described later) are juxtaposed at substantially equal intervals along the circumferential direction. Further, on the outer peripheral surface of the inner cylinder 10, a thread groove 11 is formed on the outer peripheral surface over several turns from the position where the inner claw 13 is provided to one end side.

  The outer cylinder 20 is a cylinder having an inner diameter slightly larger than or substantially equal to the outer diameter of the inner cylinder 10, and is sized to accommodate the lens 1 and the inner cylinder 10 therein. At one end of the outer cylinder 20, a disk-shaped lens pressing portion 22 having an opening having a diameter smaller than the inner diameter of the outer cylinder 20 at the center is a hook-like shape toward the inside so as to narrow the opening diameter of one end of the outer cylinder 20. Is provided. On the inner peripheral surface in the vicinity of the other end of the outer cylinder 20, four outer claws 23 (details will be described later) that engage with the inner claws 13 of the inner cylinder 10 are arranged in parallel at substantially equal intervals along the circumferential direction. ing. Further, on the inner peripheral surface of the outer cylinder 20, a screw groove 21 that is screwed into the screw groove 11 of the inner cylinder 10 is formed between the lens pressing portion 22 and the outer claw 23, and the inner peripheral surface is formed over several turns. It is.

  FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and is a schematic cross-sectional view showing the configuration of the inner claw 13 and the outer claw 23. The inner claw 13 of the inner cylinder 10 has a substantially wedge shape with a substantially right-angled cross section, and the radial surface 14 provided in the radial direction of the inner cylinder 10 and the outermost end of the radial surface 14 of the inner cylinder 10. It has the inclined surface 15 inclined in the circumferential direction to the outer peripheral surface. A plurality of inner claws 13 are arranged on the outer peripheral surface of the inner cylinder 10 in the same direction in the circumferential direction of the outer peripheral surface without a substantial gap.

  The outer claw 23 of the outer cylinder 20 has substantially the same shape as the inner claw 13 of the inner cylinder 10 and has a substantially wedge shape whose cross section is a substantially right triangle. However, the outer claw 23 of the outer cylinder 20 is smaller in width in the axial direction of the outer cylinder 20 than the inner claw 13 of the inner cylinder 10 (see FIG. 1). The outer claw 23 has a radial surface 24 provided radially inward of the outer cylinder 20 and an inclined surface 25 inclined in the circumferential direction from the innermost end of the radial surface 24 to the inner peripheral surface of the outer cylinder 20. ing. Further, four outer claws 23 are arranged in parallel at substantially equal intervals on the inner peripheral surface of the outer cylinder 20.

  Further, in the state where the inner cylinder 10 and the outer cylinder 20 are screwed together by the screw groove 11 and the screw groove 21, the inclination direction of the inclined surface 15 of the inner claw 13 is opposite to the inclination direction of the inclined surface 25 of the outer claw 23. The outermost end of the inner claw 13 is positioned outside the innermost end of the outer claw 23. Since the innermost end of the outer claw 23 is located outside the outermost end of the thread groove 21 of the outer cylinder 20 (see FIG. 1), when the inner cylinder 10 is screwed into the outer cylinder 20 The screw groove 11 of the inner cylinder 10 can be screwed without contacting the outer claw 23 of the outer cylinder 20.

  When the outer cylinder 20 is rotated in the direction of the arrow A in the figure, or when the inner cylinder 10 is rotated in the direction of the arrow B, the inclined surface 15 of the inner claw 13 and the outer claw 23 are rotated along with the rotation. The inclined surface 25 abuts. In this state, the resistance to rotation is increased, but by applying a slightly large force in the direction of the arrow A or B, the inner cylinder 10 or the outer cylinder 20 is moved with some elastic deformation of the inner cylinder 10 or the outer cylinder 20. Further rotation is possible.

  When trying to rotate the outer cylinder 20 in the direction opposite to the arrow A, or when trying to rotate the inner cylinder 10 in the direction opposite to the arrow B, the radial surface 14 of the inner claw 13 The radial surface 24 of the outer claw 23 comes into contact with the inner claw 13 and the outer claw 23. Since the radial direction surface 14 and the radial direction surface 24 are provided in a direction substantially orthogonal to the rotation direction, the inner cylinder 10 and the outer cylinder 20 cannot be further rotated in this state.

  FIG. 3 is a schematic diagram showing an example of a procedure for fixing the lens 1. When the lens 1 is fixed, first, the other surface of the lens 1 (a non-convex surface) is brought into contact with an end surface on one side of the inner cylinder 10 (the side opposite to the side to which the connecting cylinder 30 is connected). Next, the outer cylinder 20 is put on the lens 1 and the inner cylinder 10 from the side where the outer claw 23 is provided, and the outer cylinder 20 is rotated to screw the screw groove 11 of the inner cylinder 10 and the screw groove 21 of the outer cylinder 20 together. Let When the outer cylinder 20 continues to rotate, the inclined surface 25 of the outer claw 23 comes into contact with the inclined surface 15 of the inner claw 13, and in this state, a slightly large force is applied to rotate the outer cylinder 20 to rotate the inner cylinder. 10 and the outer cylinder 20 are screwed together. Thereafter, the inner cylinder 10 is accommodated in the outer cylinder 20, and the planar portion of the peripheral surface of one surface of the lens 1 is brought into contact with the lens pressing portion 22 of the outer cylinder 20. It is sandwiched and fixed between the end surface and the lens pressing portion 22 of the outer cylinder 20. In this state, since the outer cylinder 20 cannot be rotated in the direction in which the inner cylinder 10 and the outer cylinder 20 are unscrewed, the lens 1 cannot be removed.

  FIG. 4 is a schematic cross-sectional view showing the internal configuration of the inner cylinder 10. The inner diameter of the inner cylinder 10 and the inner diameter of the connecting cylinder 30 are substantially equal, and the inside of the inner cylinder 10 and the inside of the connecting cylinder 30 communicate with each other. A plurality of lenses 2, 3, 4, etc. can be arranged in the inner space of the inner cylinder 10 and the connecting cylinder 30 at a predetermined interval.

  In addition, a sealing ring 40 formed of rubber or fluororesin is formed on one end face of the inner cylinder 10 so as to surround the periphery of the opening communicating with the internal space for disposing the lenses 2, 3, 4. Is arranged. When the inner cylinder 10 and the outer cylinder 20 are screwed together and the lens 1 is sandwiched and fixed, the sealing ring body 40 is interposed between the other surface of the lens 1 and one end face of the inner cylinder 10. The other surface and the end surface on one side of the inner cylinder 10 are in close contact with each other. This prevents water or the like from entering the inside of the sealing ring 40, that is, the inside of the inner cylinder 10.

  In the lens fixing structure having the above configuration, a plurality of inner claws 13 having a substantially right-angled triangle cross section are arranged in the circumferential direction on the outer peripheral surface of the inner cylinder 10, and an outer surface having a substantially right-angled triangle cross section is formed on the inner peripheral surface of the outer cylinder 20. By adopting a configuration in which four claws 23 are disposed, the inner claw 13 and the outer claw 23 are engaged by screwing the inner cylinder 10 and the outer cylinder 20, and the rotation in the direction in which the screw engagement is released is engaged. Since it can stop, the lens 1 fixed by being sandwiched between the inner cylinder 10 and the outer cylinder 20 is not displaced. When this lens fixing structure is applied to, for example, an in-vehicle camera, it is possible to prevent the lens from being displaced due to the vibration of the vehicle, so that the reliability of the in-vehicle camera can be improved. Furthermore, since the sealing ring 40 is disposed between the other surface of the lens 1 and the end surface on one side of the inner cylinder 10, water and the like can be prevented from entering the inner cylinder 10. In addition, the reliability of the in-vehicle camera can be further improved. Further, by making the width of the outer claw 23 of the outer cylinder 20 smaller than the inner claw 13 of the inner cylinder 10 with respect to the axial direction of the outer cylinder 20, the engagement positions of the outer claw 23 and the inner claw 13 are slightly shifted with respect to the axial direction. Even in this case, the rotation in the direction of releasing the screwing of the inner cylinder 10 and the outer cylinder 20 can be locked.

  In the present embodiment, the inner claws 13 of the inner cylinder 10 and the outer claws 23 of the outer cylinder 20 have a substantially right-angled cross section. However, the present invention is not limited to this, and the rotation of the inner cylinder 10 or the outer cylinder 20 is not limited thereto. Any shape that can regulate the direction in one direction may be used. In addition, the inner claw 13 and the outer claw 23 are configured to be provided on the other side of the inner cylinder 10 and the outer cylinder 20, but are not limited thereto, and may be configured to be provided on one side of the inner cylinder 10 and the outer cylinder 20. Good. Moreover, the structure which does not provide the sealing ring 40 may be sufficient. Further, the configuration of the lenses 2, 3, 4 provided inside the inner cylinder 10 and the connecting cylinder 30 is an example, and the present invention is not limited to this, and other configurations may be used. The lens may not be provided in the interior. Further, although the four outer claws 23 are provided on the outer cylinder 20, the present invention is not limited to this, and a configuration in which three or less or five or more outer claws 23 are provided may be employed. FIG. 3 shows a procedure for performing screwing by the thread groove 11 of the inner cylinder 10 and the thread groove 21 of the outer cylinder 20 by rotating the outer cylinder 20, but the present invention is not limited to this. Screwing may be performed by rotating the tube 10.

(Modification 1)
FIG. 5 is a schematic cross-sectional view showing a configuration of a lens fixing structure according to Modification 1 of the present invention. In the inner cylinder 10a of the lens fixing structure according to the modification 1, the lens 1 is brought into contact with the end face on one end side, and the connecting cylinder 30 is connected to the end face on the other side. On the outer peripheral surface near the other end of the inner cylinder 10a, a plurality of inner claws 13a are arranged along the circumferential direction at substantially equal intervals, and the outer circumference from the position where the inner claws 13a are provided to one end side. A thread groove 11 is formed on the surface. Further, the outer cylinder 20a having a thread groove 21 screwed into the thread groove 11 of the inner cylinder 10a formed on the inner peripheral surface is provided with a lens pressing portion 22 on one end side, and an inner peripheral surface near the other end is provided on the inner peripheral surface. Outer claws 23a that engage with the inner claws 13a of the cylinder 10a are arranged in parallel at substantially equal intervals along the circumferential direction.

  1 has a smaller width in the axial direction of the outer cylinder 20 than the inner claw 13 of the inner cylinder 10, the modified example 1 shown in FIG. The outer claw 23a of the outer cylinder 20a of the lens fixing structure according to the above has a larger width in the axial direction of the outer cylinder 20a than the inner claw 13a of the inner cylinder 10a. In this configuration, similarly to the lens fixing structure shown in FIG. 1, even when the engagement positions of the outer claw 23a and the inner claw 13a are slightly shifted in the axial direction, the inner cylinder 10a and the outer cylinder 20a are screwed together. The rotation in the releasing direction can be locked.

(Modification 2)
FIG. 6 is a schematic cross-sectional view showing a configuration of a lens fixing structure according to Modification 2 of the present invention. On the outer peripheral surface of the inner cylinder 10b of the lens fixing structure according to the modified example 2, four inner claws 13b having a substantially right triangle in cross section are provided at equal intervals in the circumferential direction, and the inner peripheral surface of the outer cylinder 20b is provided on the outer peripheral surface. A plurality of outer claws 23b having a substantially right-angled cross section are juxtaposed in the circumferential direction with almost no gap. Thus, even when the number of the outer claws 23b of the outer cylinder 20b is larger than the number of the inner claws 13b of the inner cylinder 10b, the same effect as the lens fixing structure shown in FIG. 2 can be obtained. it can.

It is typical sectional drawing which shows the structure of the lens fixing structure which concerns on this invention. It is sectional drawing by the II-II line of FIG. 1, and is typical sectional drawing which shows the structure of an inner nail | claw and an outer nail | claw. It is a schematic diagram which shows an example of the fixing procedure of a lens. It is typical sectional drawing which shows the internal structure of an inner cylinder. It is typical sectional drawing which shows the structure of the lens fixing structure which concerns on the modification 1 of this invention. It is typical sectional drawing which shows the structure of the lens fixing structure which concerns on the modification 2 of this invention. It is typical sectional drawing which shows the structure of the conventional lens fixing structure.

Explanation of symbols

1 Lens 10 Inner cylinder (first cylinder)
11 Thread groove 13 Inner claw (first claw part)
20 Outer cylinder (second cylinder)
21 Thread groove 22 Lens holding part 23 Outer claw (second claw part)
40 Sealed ring

Claims (8)

A first cylinder having a thread groove formed on the outer peripheral surface; a second cylinder having a screw groove formed on the inner peripheral surface; and the second cylinder having a thread groove engaged with the screw groove of the first cylinder. A lens retainer provided on the cylindrical body and in contact with an edge portion of one surface of the lens coaxially accommodated in the second cylindrical body, wherein the first cylindrical body and the second cylindrical body are threaded. In a lens fixing structure in which the lens is sandwiched and fixed between one end portion of the first cylindrical body and the lens pressing portion of the second cylindrical body.
A first claw portion provided on the outer peripheral surface of the first cylindrical body;
Provided on the inner peripheral surface of the second cylinder, and engages with the first claw portion to lock the rotation in the direction of releasing the screwing of the first cylinder and the second cylinder. A second claw portion to be
The lens fixing structure, wherein the lens is fixed in a non-removable manner by engagement of the first claw portion and the second claw portion.   The lens fixing structure according to claim 1, wherein a plurality of the first claw portions are arranged in parallel along the circumferential direction on the outer peripheral surface of the first cylindrical body.   3. The lens fixing structure according to claim 1, wherein a plurality of the second claw portions are arranged in parallel along the circumferential direction on the inner peripheral surface of the second cylindrical body. The first claw portion is provided on the opposite side of the one end portion with the thread groove of the first cylindrical body in between.
The lens fixing structure according to any one of claims 1 to 3, wherein the second claw portion is provided on the opposite side of the lens pressing portion with the thread groove of the second cylindrical body in between. .   5. The lens fixing structure according to claim 4, wherein an innermost portion of the second claw portion is positioned outside an outermost portion of a thread groove of the second cylindrical body.   The lens fixing structure according to claim 1, wherein the first claw portion has a width dimension in an axial direction larger than a width dimension of the second claw portion.   The lens fixing structure according to claim 1, wherein the second claw portion has a width dimension in an axial direction larger than a width dimension of the first claw portion.   The lens fixing structure according to any one of claims 1 to 7, wherein a sealing ring is provided at a contact portion of the first cylindrical body with the lens.

Images