JP6619148B2 - Lens barrel and camera - Google Patents

Description

  The present invention relates to a lens barrel and a camera.

  In general, many cameras include a lens barrel that holds a lens therein. For example, Patent Document 1 discloses a lens barrel having waterproofness.

  The lens barrel described in Patent Document 1 includes a lens holding barrel that holds a lens, a fixing member that fixes the lens holding barrel inside and has a thread groove, and a thread groove that is screwed into the thread groove. A pressing member, and a waterproof sheet member that seals a gap between the pressing member and the lens holding barrel. It is described that the waterproof sheet member prevents water from entering the lens barrel through the gap between the pressing member and the lens holding barrel.

JP 2008-203287 A

  However, the lens barrel described in Patent Document 1 includes a waterproof sheet member that seals the gap between the pressing member and the lens holding barrel, but seals the gap between the lens and the lens holding barrel. Since there is no means for stopping, water may enter the lens barrel through the gap between the lens and the lens holding barrel. This intrusion of water may cause corrosion or fading of members in the lens barrel.

  Further, in the lens holding lens barrel of Patent Document 1, since there is no means for sealing the gap between the lens and the lens holding lens barrel, there is a risk of condensation or dust. Condensation may cause the captured image / video of the camera (camera including this lens holding lens barrel) to become unclear, and dust may cause noise in the captured image / video of the camera (camera including this lens holding lens barrel). May occur. For example, this possibility is considered to be further increased when this lens holding barrel is used as a camera module for in-vehicle use or monitoring that is always exposed to the outside world (including the case where this barrel is used as a part of this camera module). .

  In-vehicle and surveillance camera modules may require photographing with a wide field of view, and in such cases, a wide-angle lens is required as the first lens (hereinafter also referred to as G1 lens) mounted on the camera module. . In order for the lens of the first lens to be as wide as possible, the lens holding barrel holds the lens so that the structure of the tip of the lens barrel is limited (for example, on the subject lens side of the lens of the first lens, The lens barrel prevents the angle of view from being narrowed by the caulking part (protrusion) for holding the lens, the installation space of the camera module is limited, the number of parts is reduced, etc.) . In-vehicle and surveillance camera modules require a means for holding a lens having waterproof properties while holding the lens in consideration of this limitation.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a lens barrel and a camera that are highly waterproof and / or dustproof, and is preferably used in vehicles that are always exposed to the outside world. It is an object of the present invention to provide a lens barrel and a camera that are applicable to surveillance purposes and the like and have high waterproofness and / or dustproofness.

In order to achieve the above object, a lens barrel according to a first aspect of the present invention includes a cylindrical lens holding frame, a lens that contacts one end of the lens holding frame, and the lens holding frame inside. A cylindrical lens holding member that is inserted and holds the lens together with the lens holding frame; and an end portion of the lens holding frame, the lens and a seal member that is in close contact with the lens holding member, and the sealing member Is positioned opposite to the contact portion where the lens holding member and the lens are in contact with each other , and one end portion of the lens holding frame includes a recess that forms a series of gaps between the lens and the lens holding member. The seal member is housed inside the recess, is positioned to face the contact portion, and is disposed between the contact portion and the bottom surface of the recess, and the seal member is more than the contact portion. A first protrusion that is located on the lens holding member side and protrudes toward the lens holding member so as to be in close contact with the lens holding member, and is located closer to the lens than the contact portion and is in close contact with the lens And a second ridge portion protruding toward the lens.
In order to achieve the above object, a camera according to a second aspect of the present invention includes a lens barrel according to the first aspect of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, in a lens-barrel and a camera, waterproofness and / or dustproofness can be improved more.

It is the schematic of the camera which concerns on 1st Embodiment of this invention. It is a perspective view which shows the to-be-photographed object side edge part of the lens barrel which concerns on 1st Embodiment, and its vicinity. It is sectional drawing of the lens-barrel which concerns on 1st Embodiment, Comprising: It is sectional drawing of the AABB part shown in FIG. It is sectional drawing of the lens-barrel which concerns on 2nd Embodiment, Comprising: It is sectional drawing of the part corresponded to the AABB part shown in FIG. (A) is an enlarged view of the lens barrel according to the second embodiment, and is an enlarged view of a portion surrounded by a one-dot chain line C in FIG. 4, and (b) is a lens according to the second embodiment. FIG. 5 is an enlarged view when a step is generated between the lens holding member and the lens in the lens barrel, and is an enlarged view of a portion surrounded by an alternate long and short dash line C in FIG. 4. It is sectional drawing of the lens-barrel which concerns on 3rd Embodiment, Comprising: It is sectional drawing of the part corresponded to the AABB part shown in FIG. It is sectional drawing of the lens-barrel which concerns on one modification of this invention, Comprising: It is sectional drawing of the part corresponded to the AABB part shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same elements are denoted by the same reference symbols throughout the drawings.

(First embodiment)
The camera 1 according to the first embodiment of the present invention includes a camera body 2 and a cylindrical lens barrel 10 attached to the camera body 2 as shown in FIG.

  The camera body 2 includes an image sensor 6 having an approximately rectangular imaging surface centered on the optical axis O and facing the subject. The imaging device 6 is an element that outputs an electrical signal corresponding to an image formed on the imaging surface, and includes, for example, a CCD (Charge Coupled Device) image sensor, a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and the like. .

  The lens barrel 10 is configured to be attachable to the camera body 2 and holds three lenses G1, G2, G3 arranged in order from the subject side along the optical axis O. The lenses G1, G2, and G3 form an image of the subject on the imaging surface of the imaging element 6. The lens G1 is a subject side lens exposed on the subject side. The lenses G2 and G3 are built-in lenses held inside the lens barrel 10. Each of the three lenses G1, G2, and G3 according to the present embodiment is a convex lens having a spherical surface on the subject side and a flat surface on the image sensor side.

  In addition, the lens surface employ | adopted for each lens G1, G2, G3 may be formed in any of a spherical surface, a plane, and an aspherical surface. When the lens surface is a spherical surface or a flat surface, it becomes easy to process each lens G1, G2, G3, and assembly adjustment to the lens holding frame 13 to be described later, and prevent changes in optical performance due to errors in processing and assembly adjustment. it can. When the lens surface is an aspheric surface, the aspheric surface is an aspheric surface by grinding, a glass mold aspheric surface made of glass with an aspheric shape, or a composite aspheric surface made of resin with an aspheric shape on the glass surface. Any aspheric surface may be sufficient. The lens surface may be a diffractive surface, and each of the lenses G1, G2, and G3 may be a gradient index lens (GRIN lens) or a plastic lens.

  Furthermore, the lens surfaces of the lenses G1, G2, and G3 may be subjected to various processes as necessary. As an example of this processing, the lens surface can be hydrophilized with a photocatalyst or the like in order to prevent the lens surface from being fogged or to prevent the formation of water droplets on the lens surface. In addition, the lens surface may be hydrophilized with a photocatalyst or the like in order to prevent fogging of the lens surface and formation of water droplets on the lens surface with respect to a portion that may be exposed to the outside.

  The number of built-in lenses is not limited to two, and any number may be provided. Further, the built-in lens may not be provided.

  Specifically, the lens barrel 10 has a bottomed or bottomless cylindrical shape as shown in FIG. 2 showing the subject side end and its vicinity, and FIG. 3 which is an enlarged sectional view of the subject side end and its neighborhood. The lens holding frame 13 to be formed, the cylindrical lens holding member 11 that inserts the lens holding frame 13 therein and holds the lens G1 together with the lens holding frame 13, and foreign matters such as water into the lens barrel 10 And a seal member 20 that suppresses the intrusion of. The lens holding member 11 and the lens holding frame 13 are made of, for example, plastic or metal. The seal member 20 is made of an elastic material such as rubber, for example.

  3 is a cross-sectional view of the AABB portion shown in FIG. 2, and shows an enlarged portion of the lens barrel 10 that holds the subject side lens G1. The lens barrel 10 according to the present embodiment has the same cross section shown in FIG. 3 along its circumferential direction.

  The lens holding member 11 is connected to the cylinder portion 11e in which the subject side end portion as one end portion of the lens holding frame 13 is fitted, and the lens fitting that forms a hole in which the lens G1 is fitted. A joining portion 11b and a pressing piece portion 11c extending from the subject side end as one end of the lens fitting portion 11b and pressing the subject side surface as one surface of the lens G1 are provided. For example, one end of the lens holding frame 13 is an end on the subject side, and the other end of the lens holding frame 13 is an end on the image sensor 6 side.

  A thread groove 11a is formed on the inner peripheral surface of the cylindrical portion 11e. On the outer peripheral surface of the lens holding frame 13, a screw thread 13 a that is screwed into the screw groove 11 a of the lens holding member 11 is formed. When the thread groove 11 a of the lens holding member 11 is screwed into the screw thread 13 a of the lens holding frame 13, the lens holding member 11 is fitted to the lens holding frame 13 so as not to come off in the optical axis O direction.

  The lens fitting portion 11b has an annular shape and extends from the end of the cylindrical portion 11e on the subject side toward the optical axis O and surrounds the periphery of the lens G1 as shown in FIGS. In a state where the lens holding member 11 is fitted to the lens holding frame 13, the lens fitting portion 11 b is located on the subject side (left side in FIG. 3) of the lens holding frame 13. The pressing piece 11c extends toward the optical axis O from the subject side end of the inner peripheral surface of the lens fitting portion 11b.

  The lens fitting portion 11b holds the lens G1 inside as shown in FIG. Specifically, the inner peripheral surface S1 of the lens fitting portion 11b and the side peripheral surface S2 located at the outer peripheral portion of the lens G1 are in surface contact. The inner surface of the lens G1 (the other surface extending in the direction orthogonal to the optical axis O) is in contact with the subject-side end surface of the lens holding frame 13. The pressing piece 11c presses the surface of the lens G1 facing the subject side against the lens holding frame 13 by contacting the vicinity of the outer peripheral end of the surface of the lens G1 facing the subject. Accordingly, the lens G1 is held in the lens barrel 10 by the lens holding frame 13 and the lens holding member 11.

  As shown in FIG. 3, the lens holding frame 13 includes a recess 13 b that forms a series of gaps between the lens G <b> 1 and the lens fitting portion 11 b of the lens holding member 11 at the end on the subject side.

  Specifically, the recess 13b is a substantially annular groove centered on the optical axis O and is open to the subject side. The bottom portion (surface portion on the imaging surface element side) of the recess 13b is formed at a position facing a portion where the inner peripheral surface S1 of the lens fitting portion 11b and the side peripheral surface S2 of the lens G1 are in contact with each other.

  The seal member 20 has a shape along the recess 13 b and is disposed in the recess 13 b of the lens holding frame 13. The seal member 20 is in close contact with the lens G1, the lens fitting portion 11b, and the concave portion 13b. The seal member 20 may be bonded to the bottom surface of the recess 13b using an adhesive or the like, and thereby fixed in the recess 13b.

  As shown in the cross-sectional view of FIG. 3, the seal member 20 according to the present embodiment is provided with a main body 21, a first protrusion 22 a and a second protrusion that are provided on the main body 21 and protrude toward the subject side or the imaging element side. It has the strip part 22b, the 3rd protrusion part 22c, and the 4th protrusion part 22d. Since the seal member 20 has a shape along the recess 13b as described above, the seal member 20 generally has an annular shape in the present embodiment. Therefore, the seal member 20 has the same cross section in the plane including the optical axis O.

  Specifically, the main body 21 has an annular shape when viewed from the optical axis O direction, and has a rectangular cross section as shown in FIG. As shown in FIG. 3, the main body 21 is disposed in the recess 13 b with the long side of the cross section thereof being oriented along the radial direction of the lens barrel 10 (direction perpendicular to the optical axis O). A gap is formed between both ends of the main body 21 in the radial direction of the lens barrel 10 and the side peripheral surface (surface extending along the optical axis O) of the recess 13b.

  Each of the first protrusion 22a, the second protrusion 22b, the third protrusion 22c, and the fourth protrusion 22d forms a continuous protrusion along the recess 13b when viewed from the optical axis O direction. Therefore, in the present embodiment, each of the first protrusion 22a, the second protrusion 22b, the third protrusion 22c, and the fourth protrusion 22d has an optical axis O as viewed from the optical axis O direction. A ring centered on As shown in FIG. 3, each of the first protrusion 22a, the second protrusion 22b, the third protrusion 22c, and the fourth protrusion 22d has a semicircular cross section, and each vertex is In the direction of the optical axis O, it is farthest from the main body 21.

  The first protrusion 22a is provided at a position farther from the optical axis O than the second protrusion 22b. The first protrusion 22 a protrudes toward the lens fitting portion 11 b of the lens holding member 11. The second protrusion 22b protrudes toward the lens G1.

  The third protrusion 22c is provided at a position farther from the optical axis O than the fourth protrusion 22d. Each of the 3rd protrusion part 22c and the 4th protrusion part 22d is provided in the main-body part 21, and protrudes toward the bottom face of the recessed part 13b.

  As the lens holding member 11 is screwed into the lens holding frame 13, the distance between the lens G1 and the lens fitting portion 11b and the bottom surface of the concave portion 13b decreases.

  When the distance between the lens fitting portion 11b and the bottom surface of the concave portion 13b is reduced, the first and third protruding portions 22a and 22c protruding from the main body portion 21 along the direction in which the optical axis O extends are fitted into the lens. The portion 11b and the bottom surface of the recess 13b are compressed in the direction in which the optical axis O extends. As a result, the 1st protrusion part 22a closely_contact | adheres to the surface facing the recessed part 13b of the lens fitting part 11b. The second protrusion 22b is in close contact with the vicinity of the outer edge of the surface on the image sensor side of the lens G1. Between the position where the first protrusion 22a is in close contact with the lens fitting part 11b and the position where the second protrusion 22b is in close contact with the lens G1, the inner peripheral surface S1 of the lens fitting part 11b and the lens G1 A contact portion with the side peripheral surface S2 is located.

  Further, when the distance between the lens G1 and the bottom surface of the recess 13b is reduced, the second and fourth protrusions 22b and 22d that protrude from the main body 21 along the direction in which the optical axis O extends are The inner surface of G1 and the bottom surface of the recess 13b are compressed in the direction in which the optical axis O extends. As a result, each of the 3rd protrusion part 22c and the 4th protrusion part 22d closely_contact | adheres to the bottom face (surface extended in the direction orthogonal to the optical axis O) of the recessed part 13b.

  Therefore, when the lens holding member 11 is screwed into the lens holding frame 13, a compressive force is applied to the seal member 20, so that the seal member 20 does not allow foreign matters such as water to pass through the lens G1 and the lens fitting portion 11b. In addition, it is in close contact with the lens holding frame 13.

As described above, the space between the first protrusion 22a and the second protrusion 22b is sealed in the recess 13b. For this reason, even if water or dust enters from the gap between the side peripheral surface S2 of the lens G1 and the inner peripheral surface S1 of the lens fitting portion 11b, the first protrusion 22a is formed in the lens fitting portion 11b. The second protrusion 22b is in close contact with the lens G1 to suppress the intrusion of the foreign matter in the direction toward the optical axis O by being in close contact with the lens G1. Can do.
As mentioned above, according to 1st Embodiment demonstrated, there exist the following effects.

  (1) The seal member 20 is in close contact with the lens G1, the lens holding member 11, and the lens holding frame 13. The close contact of the seal member 20 prevents water or dust from entering the lens barrel 10 through a gap between the lens G1 and the lens holding member 11. For this reason, the waterproofness and dustproofness of the lens barrel 10 are enhanced.

  (2) The seal member 20 includes a main body 21 having a shape along the recess 13b, a first protrusion 22a that is in close contact with the lens holding member 11, and a second protrusion 22b that is in close contact with the lens G1. The first protrusion 22a and the second protrusion 22b are provided apart from each other in a direction orthogonal to the optical axis O. The first protrusion 22a suppresses entry of foreign matter such as water that has entered from the contact portion into the direction away from the optical axis O beyond the seal member 20. The second protrusion 22b suppresses entry of foreign matter such as water entering from the contact portion in the direction toward the optical axis O beyond the seal member 20. Thus, the function is ensured more reliably by giving each the 1st protrusion part 22a and the 2nd protrusion part 22b a single function. Specifically, as shown in FIG. 3, due to the shape error or assembly error of the lens barrel 10, the surface of the lens fitting portion 11b in contact with the first protrusion 22a and the lens in contact with the second protrusion 22b. There may be a step L between the surface of G1. Even in this case, when the main body 21 is elastically deformed according to the step L, the first protrusion 22a is in close contact with the lens fitting portion 11b, and the second protrusion 22b is in close contact with the lens G1. State is maintained. For this reason, the waterproofness and dustproofness of the lens barrel 10 are ensured.

  (3) The seal member 20 is disposed between a portion (contact portion) where the lens G1 and the lens holding member 11 are in contact with each other and the bottom surface of the recess 13b. As a result, foreign matter such as water enters between the lens holding member 11 and the lens holding frame 13 and foreign matter such as water enters between the lens G1 and the lens holding frame 13 with one seal member 20. Can be suppressed. For this reason, it is not necessary to provide the seal member 20 between the lens holding member 11 and the lens holding frame 13 and between the lens holding frame 13 and the lens G1, and the waterproof and dustproof properties of the lens barrel 10 are ensured. However, the number of parts can be reduced. Further, as the number of parts is reduced, the lens barrel 10 and thus the camera 1 can be reduced in size. When the camera 1 is mounted on a vehicle having a limited mounting space, downsizing is a particularly advantageous effect.

  (4) The concave portion 13b is formed in a concave shape at a position facing the contact portion in the extending direction of the optical axis O, and the seal member 20 is accommodated therein. By forming the recess 13b, the seal member 20 can be easily attached to the lens holding frame 13.

  (5) In the above embodiment, the camera 1 provided with the lens barrel 10 is mounted outside the vehicle. Since this type of camera 1 is exposed to rain or the like, higher waterproofness and dustproofness are required. In this respect, the lens barrel 10 of the above-described embodiment is particularly suitable for a camera mounted outside the vehicle because it is highly waterproof and dustproof.

  (6) A gap is formed between both ends of the main body 21 in the radial direction of the lens barrel 10 and the side peripheral surface (surface extending along the optical axis O) of the recess 13b. Accordingly, the force applied to the bottom surfaces of the lens G1, the lens fitting portion 11b, and the recess 13b from the first to fourth protrusions 22a to 22d is suppressed, and the waterproofness and dustproofness are improved.

  (7) The lens G1 is held between the lens holding member 11 and the lens holding frame 13 by screwing the lens holding member 11 into the lens holding frame 13. Here, in the configuration without the lens holding member, in order to hold the lens G1, it is conceivable to perform heat caulking to melt the resin of the lens holding frame. In this method, since heat caulking is used, the shape accuracy of the portion holding the lens G1 is low, and this portion may be formed closer to the center of the surface of the lens G1 than expected. For this reason, this method is not suitable for a wide-angle lens that requires a wide angle of view. In that respect, in the above-described embodiment, the lens G1 can be attached to the lens barrel 10 through the lens holding member 11 with high shape accuracy by screwing the lens holding member 11 to the lens holding frame 13. For this reason, the lens barrel 10 of the above embodiment is also suitable for a wide-angle lens that requires a wide angle of view.

(Second Embodiment)
A lens barrel 210 according to a second embodiment of the present invention will be described with reference to FIGS. Here, among the configurations included in the lens barrel 210 according to the second embodiment, the description of the same configuration as the first embodiment is omitted, and only the configuration different from the first embodiment will be described.

  As shown in the sectional view of FIG. 4, the lens barrel 210 according to the present embodiment includes a seal member 30 made of an elastic material such as rubber that can be elastically deformed. The seal member 30 according to the present embodiment is an O-ring having a circular cross section. The seal member 30 is deformed as shown in FIG. 4 by being compressed between the lens G1 and the lens fitting portion 11b and the bottom surface of the recess 13b.

  The lens fitting portion 11b gradually expands a hole in which the lens G1 is fitted from the subject side end of the lens fitting portion 11b toward the image pickup device side end of the lens fitting portion 11b. The first inclined surface portion 11d is inclined as described above. In other words, the first inclined surface portion 11d is inclined so as to move away from the bottom surface of the concave portion 13b toward the subject as it approaches the boundary surface between the inner peripheral surface S1 of the lens fitting portion 11b and the side peripheral surface S2 of the lens G1. doing.

  The first inclined surface portion 11d is formed, for example, by chamfering a corner portion of the lens fitting portion 11b that is exposed in the concave portion 13b.

  The lens G1 has a second inclined surface portion G1a that is inclined on the surface on the image pickup element side so as to decrease in thickness toward the outer edge portion of the lens G1. In other words, the second inclined surface portion G1a is inclined so as to move away from the bottom surface of the concave portion 13b toward the subject as it approaches the boundary surface between the inner peripheral surface S1 of the lens fitting portion 11b and the side peripheral surface S2 of the lens G1. doing.

  For example, the second inclined surface portion G1a is formed by chamfering a corner portion of the lens G1 exposed in the recess 13b.

  In a state where the side peripheral surface S2 of the lens G1 and the inner peripheral surface S1 of the lens fitting portion 11b are in surface contact, the cross section is triangular as shown in FIG. 4 by the first inclined surface portion 11d and the second inclined surface portion G1a. A seal holding hole portion 25 having a hole shape is formed.

  The seal member 30 is compressed between the bottom surface of the recess 13b and the first slope portion 11d and the second slope portion G1a. At this time, a part of the seal member 30 is in close contact with the first inclined surface portion 11d and the second inclined surface portion G1a while being elastically deformed into a shape corresponding to the seal holding hole 25 as the close contact portion 30a.

  Specifically, as shown in FIG. 5 (a), the second inclined surface portion G1a has a force F2 that moves upward at the lower portion (first portion) of the contact portion 30a of the seal member 30, that is, toward the first inclined surface portion 11d. Press. As shown in FIG. 5A, the first slope portion 11d presses the upper portion (second portion) of the contact portion 30a of the seal member 30 downward, that is, with a force F1 toward the second slope portion G1a. By these forces F1 and F2, the close contact portion 30a of the seal member 30 is kept in close contact with each of the first slope portion 11d and the second slope portion G1a. Further, the contact portion 30a of the seal member 30 is held in the seal holding hole portion 25 by being sandwiched between the first slope portion 11d and the second slope portion G1a.

  As mentioned above, according to 2nd Embodiment described above, in addition to the effect of 1st Embodiment except said (2), there exist the following effects especially.

  (8) The lens G1 is formed with a first inclined surface portion 11d that is inclined in a direction toward the subject as it approaches the side peripheral surface S2 of the lens G1, and to which the seal member 30 is in close contact. The lens holding member 11 is formed with a second inclined surface portion G1a that inclines in a direction toward the subject as it approaches the surface that contacts the side circumferential surface S2 of the lens G1, and to which the seal member 30 is in close contact. The contact portion 30a of the seal member 30 is located between the first slope portion 11d of the lens fitting portion 11b and the second slope portion G1a of the lens G1 in the direction orthogonal to the optical axis O.

  For example, as shown in FIG. 5B, due to manufacturing errors or assembly errors between the seal member 30 and the lens G1, the inner surface of the lens fitting portion 11b that contacts the seal member 30 and the inner surface of the lens G1 that contacts the seal member 30 A step L may occur between the two. In this case, a step is also formed at a portion connecting the first slope portion 11d and the second slope portion G1a.

  However, even in such a case, the first inclined surface portion 11d presses the upper portion of the close contact portion 30a of the seal member 30 with a force F1 directed downward, that is, toward the second inclined surface portion G1a. Further, the second inclined surface portion G1a presses the lower portion of the close contact portion 30a of the seal member 30 with a force F2 directed upward, that is, toward the first inclined surface portion 11d.

  Thus, even when the step L is generated between the lens fitting portion 11b and the lens G1, the first slope portion 11d and the second slope portion G1a are formed by the forces F1 and F2. The state where the seal member 30 is in close contact with the lens fitting portion 11b and the lens G1 is maintained. For this reason, the fall of the waterproofness and dustproof property accompanying the manufacturing error and assembly | attachment error of the sealing member 30 and the lens G1 is suppressed.

  (9) In this embodiment, the sealing member 30 uses an O-ring having a circular cross section. Since this type of O-ring is a standard product, it is easy to obtain and the lens barrel 210 can be easily manufactured.

(Third embodiment)
A lens barrel 310 according to a third embodiment of the present invention will be described with reference to FIG. Here, among the configurations included in the lens barrel 310 according to the third embodiment, the description of the same configurations as the second embodiment is omitted, and only the differences from the second embodiment will be described.

  The lens barrel 310 of this embodiment includes a seal member 40 as shown in the cross-sectional view of FIG. The seal member 40 includes a main body portion 40a having a rectangular cross section and a ridge portion 40b having a semicircular cross section.

  In the cross section shown in FIG. 6, the main body portion 40 a is arranged on the bottom surface of the recess 13 b with the long side oriented in the radial direction of the lens barrel 310. The protrusion 40b is provided on the side peripheral surface of the main body 40a on the subject side. The lower part of the protrusion 40b is in close contact with the second inclined surface part G1a. The upper part of the protrusion 40b is in close contact with the first slope 11d.

  As mentioned above, according to 3rd Embodiment demonstrated, in addition to the effect of 2nd Embodiment except (9), there exist the following effects especially.

  (10) The main body portion 40a of the seal member 40 has a rectangular cross section. For this reason, the contact area of the main-body part 40a of the sealing member 40 and the bottom face of the recessed part 13b can be enlarged. Accordingly, the position of the seal member 40 is prevented from being shifted in the recess 13b.

<Modification>
In addition, each said embodiment can be implemented with the following forms which changed this suitably.

  In the second embodiment, the second inclined surface portion G1a is formed on the lens G1 and the first inclined surface portion 11d is formed on the lens fitting portion 11b. However, as shown in FIG. A third slope portion 13c and a fourth slope portion 13d may be formed.

  The third slope portion 13c faces the second slope portion G1a with the seal member 30 interposed therebetween. The fourth inclined surface portion 13d faces the first inclined surface portion 11d with the seal member 30 interposed therebetween. As shown in FIG. 7, a recess having a triangular cross section is formed by the third slope portion 13c and the fourth slope portion 13d. The dent is formed so as to be deepest at a position facing the contact portion in the direction orthogonal to the optical axis O.

  The seal member 30 is sandwiched between the third slope portion 13c and the fourth slope portion 13d, and thus acts in the same manner as the first slope portion 11d and the second slope portion G1a of the second embodiment shown in FIG. Thus, the state of being in close contact with the third slope portion 13c and the fourth slope portion 13d is maintained. Thereby, the position shift of the sealing member 30 is suppressed, and by extension, the decrease in waterproofness and dustproofness of the sealing member 30 is suppressed. This modification is also applicable to the first and third embodiments.

  In each said embodiment, although the sealing members 20, 30, and 40 were accommodated in the recessed part 13b, you may abbreviate | omit this recessed part 13b. Even in this case, waterproofing and dustproofing equivalent to those in the above embodiments can be obtained by bonding the sealing members 20, 30, 40 to the lens holding frame 13 with an adhesive or the like.

  In 1st Embodiment, you may abbreviate | omit any one among the 1st protrusion part 22a of the sealing member 20, the 2nd protrusion part 22b, the 3rd protrusion part 22c, and the 4th protrusion part 22d. .

  The camera 1 including the lens barrels 10, 210, 310, 410 according to the above embodiments is required to be waterproof and dustproof, for example, an in-vehicle camera mounted outside the vehicle, a surveillance camera installed outdoors, and the like. It is suitably applied to an outdoor camera.

  Various embodiments and modifications can be made to the present invention without departing from the broad spirit and scope of the present invention. The above-described embodiments are for explaining the present invention and do not limit the scope of the present invention. In other words, the scope of the present invention is shown not by the embodiments but by the claims. Various modifications within the scope of the claims and within the scope of the equivalent invention are considered to be within the scope of the present invention.

10, 210, 310, 410 Lens barrel 11 Lens holding member 11a Screw groove 11b Lens fitting portion 11c Pressing piece portion 11d First slope portion 11e Tube portion 13 Lens holding frame 13a Screw thread 13b Recessed portion 20, 30, 40 Seal member 22a-22d 1st-4th protrusion part 25 Seal holding hole part 30a Contact part 21, 40a Main body part 40b Projection part G1-G3 Lens G1a 2nd slope part

Claims (3)

A cylindrical lens holding frame;
A lens in contact with one end of the lens holding frame;
A cylindrical lens holding member that inserts the lens holding frame therein and holds the lens together with the lens holding frame;
One end of the lens holding frame, a seal member that is in close contact with the lens and the lens holding member,
The seal member is positioned opposite to a contact portion where the lens holding member and the lens are in contact with each other ;
One end of the lens holding frame includes a recess that forms a series of gaps between the lens and the lens holding member,
The seal member is housed inside the recess, is positioned facing the contact portion, and is disposed between the contact portion and the bottom surface of the recess,
The sealing member is
A first protrusion that is positioned closer to the lens holding member than the contact portion and protrudes toward the lens holding member so as to be in close contact with the lens holding member;
A lens barrel , comprising: a second protrusion that is positioned closer to the lens than the contact portion and protrudes toward the lens so as to be in close contact with the lens. The lens holding member is
A cylindrical portion in which one end of the lens holding frame is fitted;
A lens fitting portion connected to the tube portion and forming a hole into which the lens is fitted;
A pressing piece that extends from one end of the lens fitting portion and presses one surface of the lens;
A first slope portion that is inclined so as to gradually expand the hole from one end of the lens fitting portion toward the other end at the other end of the lens fitting portion, and the seal member is in close contact with the first fitting portion;
The lens is provided with a second inclined surface portion on the other surface that is inclined so as to decrease in thickness toward an outer edge portion, and the seal member is in close contact therewith,
The lens barrel according to claim 1 , wherein the first slope portion and the second slope portion are opposed to the concave portion. Camera provided with a lens barrel according to claim 1 or 2.

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