JP5684944B2 - Lens device for surveillance camera - Google Patents

Description

  The present invention relates to a lens device for a surveillance camera, and more particularly to a lens device for a surveillance camera for a surveillance camera in which a lock mechanism is provided on an operation ring for performing zooming and focusing.

  For lens devices for surveillance cameras that perform manual zooming and focusing (for example, varifocal lenses for surveillance), the zoom and focus operation rings are locked to prevent the set zoom and focus positions from moving. A mechanism is provided.

  The conventional locking mechanism for the operating ring locks the operating ring by pushing the knob screwed to the outer periphery of the operating ring toward the lens barrel body and pressing the tip of the knob against the outer peripheral surface of the lens barrel body. Was.

  However, in this way, in the method of locking the operation ring by pressing the tip of the knob against the outer peripheral surface of the barrel main body, a concentrated load is applied to one point of the cylinder to compress it, so that the rigidity of the barrel main body is low. In addition, there is a drawback that the lens barrel body is bent and adversely affects optical performance such as one-sided blur.

  Therefore, Patent Document 1 proposes a lens device in which a rubber band is inserted at a position where the tip of the knob is pressed.

  Patent Document 2 proposes a lens device that locks an operation ring by rotating a knob and bringing a presser plate into contact with an inner wall of a groove formed in a lens barrel body.

  Patent Document 3 proposes a lens device in which, when a substantially C-shaped retaining ring is tightened, the retaining ring is elastically deformed to press and lock the operation ring from substantially the entire circumference.

JP 2006-251581 A JP 2011-154309 A JP 2011-154308 A

  However, in the invention described in Patent Document 1, since the knob is pressed against the lens barrel, it is inevitable that a force is applied to the lens barrel from one direction so that the lens barrel is pushed inward.

  Further, in the invention described in Patent Document 2, the lens barrel is not deformed so as to be pushed inward. However, since force is applied to the lens barrel from one direction, there is a possibility that the optical system is decentered or falls. is there.

  In the invention described in Patent Document 3, no force is applied to the lens barrel from one direction. However, in the invention described in Patent Document 3, there is a problem that it is difficult to lock the operation ring because the knob is disposed along the tangential direction of the lens barrel.

  The present invention has been made in view of such circumstances, and provides a surveillance camera lens device that can reliably lock an operation ring without causing deformation of a lens barrel and the like, and is easy to lock the operation ring. The purpose is to do.

  In order to achieve the above object, a lens device for a surveillance camera according to an aspect of the present invention is provided with a movable lens that is movably supported by a lens barrel body, and is rotatable with respect to the lens barrel body. An operation ring that moves the moving lens in the optical axis direction by a moving operation, a substantially cylindrical ring member provided on the outer periphery of the operation ring, a fixing member provided between the operation ring and the ring member, and a ring member A locking operation member provided between the ring member and the fixing member, wherein the locking operation member moves the ring member and the fixing member in opposite directions by rotating, and at least one of the ring member and the locking operation member And a support mechanism for supporting the ring member so as to be movable only in a direction perpendicular to the optical axis of the moving lens, and rotating the lock operation member to make the ring member and the fixing member opposite to each other. Tightened so as not to rotate the operation ring is moved.

  According to the monitoring camera lens device of one aspect of the present invention, the operation ring is provided so as to be rotatable with respect to the lens barrel body, and the movable lens is moved in the optical axis direction by the rotation operation of the operation ring. . When the lock operation member is rotated, the substantially cylindrical ring member provided on the outer periphery of the operation ring and the fixing member provided between the operation ring and the ring member are moved in directions opposite to each other. It is tightened so that it cannot rotate. As a result, the operation ring can be reliably locked without causing deformation of the lens barrel or the like. Further, since the lock operation member only needs to be rotated, the operation ring can be easily locked.

  In the surveillance camera lens device according to another aspect of the present invention, the fixing member may be a member whose surface in contact with the operation ring is curved with substantially the same curvature as the operation ring. Thereby, the load concerning a ring member can be disperse | distributed more and a deformation | transformation of a ring member can be prevented.

  In the surveillance camera lens device according to another aspect of the present invention, the fixing member has a first convex portion in contact with the operation ring, the tip of which is positioned on a line having the same curvature as the outer peripheral surface of the operation ring. It may be formed. Thereby, a load can be applied to the operation ring via the convex portion.

  In the monitoring camera lens device according to another aspect of the present invention, the first convex portions may be formed approximately every 90 °. Thereby, force can be applied to the operation ring at equal intervals.

  In the surveillance camera lens device according to another aspect of the present invention, the ring member may be formed with a second convex portion at a position facing the first convex portion. Thereby, a load can be applied at the position where the convex portion abuts.

  In the surveillance camera lens device according to another aspect of the present invention, the lens barrel main body is formed with a hole in a direction perpendicular to the optical axis of the moving lens, and the lock operating member is passed through the hole to provide a support mechanism. It may be configured. Accordingly, the lock operation member, the ring member, and the fixing member are prevented from rotating with a simple configuration.

  In the surveillance camera lens device according to another aspect of the present invention, the lens barrel body includes a substantially cylindrical tube portion provided inside the operation ring, and a flange portion formed so as to contact the end surface of the ring member. A convex portion in a direction orthogonal to the optical axis of the moving lens and a groove engaging with the convex portion may be formed as a support mechanism on the surfaces of the flange portion and the ring member that are in contact with each other. Accordingly, the lock operation member, the ring member, and the fixing member are prevented from rotating with a simple configuration.

  According to the present invention, it is possible to provide a surveillance camera lens device that can reliably lock the operation ring without causing deformation of the lens barrel and the like and can be easily locked.

The perspective view which shows one Embodiment of the lens apparatus for surveillance cameras which concerns on this invention Side surface sectional drawing which shows one Embodiment of the lens apparatus for surveillance cameras which concerns on this invention 2 is an enlarged view of the main part of FIG. Sectional view showing locking mechanism Perspective view showing brake ring Diagram showing brake member Sectional view showing brake member Main part perspective view of the first lens barrel body Sectional view showing locking mechanism The figure which shows the modification of the lock knob Side surface principal part sectional drawing which shows the modification of one Embodiment of the lens apparatus for surveillance cameras Sectional drawing which shows another modification of one Embodiment of the lens apparatus for surveillance cameras

  Hereinafter, preferred embodiments of a monitoring camera lens device according to the present invention will be described in detail with reference to the accompanying drawings.

[overall structure]
1 and 2 are a perspective view and a side sectional view, respectively, showing an embodiment of a surveillance camera lens device according to the present invention. This surveillance camera lens device 10 is applied to a small surveillance camera (not shown). The surveillance camera has a dome-like appearance, and includes a base, a surveillance camera body to which the surveillance camera lens device 10 is attached, a surveillance camera body, and a cover for covering the surveillance camera lens device 10. The monitoring camera lens device 10 is attached to the base so that the angle can be varied. In addition, the monitoring camera lens device 10 can rotate with respect to the base using the center line as a rotation axis.

  The surveillance camera lens device 10 is a varifocal lens having a zoom function and a focus function. Zooming is performed by rotating the zoom ring 16 provided on the outer peripheral portion of the barrel main body 12, and focusing is performed by rotating the focus ring 14 provided on the outer peripheral portion of the barrel main body 12. Is done.

  The zoom ring 16 (operation ring) for performing the zooming and the focus ring 14 for performing the focusing are each provided with a lock mechanism, and can be fixed at an arbitrary position. This will be described in detail later. Zooming and focusing are performed after the monitoring camera lens device 10 is positioned with respect to the base, and after the zooming and focusing are finished, the monitoring camera lens device 10 is covered with a cover.

  The lens barrel main body 12 (lens barrel main body) includes a first lens barrel main body 12-1 and a second lens barrel main body 12-2, and the first lens barrel main body 12-1 is used as the second lens barrel main body 12. -2 is connected on the same end coaxially to form one lens barrel body 12. The focus ring 14 is rotatably provided on the outer periphery of the first lens barrel body 12-1, and the zoom ring 16 is rotatably provided on the outer periphery of the second lens barrel body 12-2. Yes.

  The focus ring 14 is covered with a focus ring decorative unit 44 integrated with the focus ring 14, and the zoom ring 16 is covered with a zoom ring decorative cylinder 18.

  A mount ring 22 is attached to the rear end portion of the second barrel main body 12-2, and the monitoring camera lens device 10 is attached to the monitoring camera body via the mount ring 22.

  A focus lens 24, an iris unit 26, and a zoom lens 28 are arranged in order from the front side along the optical axis L inside the lens barrel body 12.

  The focus lens 24 (moving lens) is held by the focus lens frame 30 and is provided so as to be movable back and forth along the optical axis L in the first lens barrel body 12-1. The focus lens frame 30 that holds the focus lens 24 is provided with three cam pins (not shown) protruding in the radial direction on the outer peripheral surface. The three cam pins are arranged at equal intervals on the same circumference, and each of the three straight rectilinear grooves for focusing (not shown) formed in parallel with the optical axis L on the peripheral surface of the first barrel main body 12-1. And is inserted into three focus cam grooves (not shown) formed on the inner peripheral portion of the focus ring 14. As a result, when the focus ring 14 is rotated, the focus lens 24 moves back and forth along the optical axis L by the action of the cam pin, the focus straight groove and the focus cam groove. When the focus lens 24 moves back and forth along the optical axis L, the focus position of the monitoring camera lens device 10 changes.

  The zoom lens 28 is held by the zoom lens frame 32 and is provided so as to be movable back and forth along the optical axis L in the second barrel main body 12-2. The zoom lens frame 32 that holds the zoom lens 28 is provided with three cam pins (not shown) protruding in the radial direction on the outer peripheral surface. The three cam pins are arranged at equal intervals on the same circumference, and are fitted into three rectilinear grooves (not shown) formed in parallel with the optical axis L on the peripheral surface of the second barrel main body 12-2. In addition, the zoom ring 16 is individually inserted into three zoom cam grooves (not shown) formed on the inner peripheral portion of the zoom ring 16. As a result, when the zoom ring 16 is rotated, the zoom lens 28 moves back and forth along the optical axis L by the action of the cam pin, the zoom straight groove and the zoom cam groove. When the zoom lens 28 moves back and forth along the optical axis L, the focal length of the monitoring camera lens device 10 changes.

  The iris unit 26 is formed in a plate shape, and is attached to a predetermined position of the second barrel main body 12-2 by screwing with a screw (not shown). The iris unit 26 includes an iris (not shown), and the iris is driven by an iris meter 34 to operate. When the iris unit 26 is attached to the first lens barrel body 12-1, the iris is arranged so that the center thereof is located on the optical axis L.

[Lock mechanism]
As described above, the focus ring 14 and the zoom ring 16 are each provided with a lock mechanism so that it can be fixed at an arbitrary position.

  First, the lock mechanism of the zoom ring 16 will be described. As shown in FIG. 2, a screw hole 18 </ b> A into which the lock knob 50 is screwed is formed in the zoom ring cosmetic cylinder 18 disposed on the outer periphery of the zoom ring 16. When the lock knob 50 is rotated and screwed in, the tip of the lock knob 50 comes into contact with the outer periphery of the zoom ring 16, so that the zoom ring 16 is locked. In FIGS. 1 and 2, one lock knob 50 and one screw hole 18A are provided. However, a plurality of lock knobs 50 and screw holes 18A are provided, for example, two places at the top and bottom or every 120 °. Also good.

  Next, the lock function of the focus ring 14 will be described. 3 is an enlarged view of a portion of the lock mechanism of the focus ring 14 in FIG. 2, and FIG. 4 is a view of the lock mechanism of the focus ring 14 as viewed from the focus lens 24 side (left side of FIG. 2).

  A brake ring 42 is provided on the outer periphery of the focus ring 14.

  As shown in FIG. 5, the brake ring 42 (ring member) is a cylindrical member, and is formed with a hole 42 </ b> A having an oval shape when viewed along the optical axis direction. The hole 42 </ b> A is formed so that the distance between the opposing straight lines has a clearance fit that is about one hundredth of a millimeter larger than the diameter of the outer periphery of the focus ring 14. The brake ring 42 can be formed of various materials such as a material that can be elastically deformed, such as metal, plastic, and rubber. However, the processing accuracy varies depending on the material, and in the case of metal, high processing accuracy is required.

  The brake ring 42 is formed with a screw hole 42B penetrating in a direction orthogonal to the optical axis L. A lock knob 46 (lock operation member) is screwed into the screw hole 42B. Therefore, the lock knob 46 is provided so as to protrude from the brake ring 42 in the direction orthogonal to the optical axis L. Further, an anti-rotation groove 42 </ b> C is formed on the end surface of the brake ring 42.

  As shown in FIG. 6, the lock knob 46 has a screw portion 46A that is screwed into the screw hole 42B and a tip portion 46B that is thinner than the screw portion 46A, and a recess portion 46C into which the E-ring 47 can be inserted. Is formed.

  As shown in FIG. 4, a brake member 40 (fixing member) is provided between the focus ring 14 and an arc portion that is not in contact with the outer periphery of the focus ring 14 in the hole 42 </ b> A of the brake ring 42.

  FIG. 6 is a perspective view of the brake member 40, and FIG. 7 is a cross-sectional view of the brake member 40. The brake member 40 is a plate-like member that is curved with substantially the same curvature as the focus ring 14.

  As shown in FIG. 6, a substantially U-shaped groove 40 </ b> A for inserting the E-ring 47 is formed on the surface (inner peripheral surface) of the brake member 40 facing the focus ring 14. In addition, a hole 40 </ b> C through which the tip of the lock knob 46 passes is formed substantially at the center of the brake member 40. Since one end of the groove 40A is connected to the end face of the brake member 40, the brake member 40 is inserted into the hole 42A along the focus ring 14 and the lock knob 46 is inserted into the hole 40C. The E-ring 47 can be fitted into the recess 46C of the lock knob 46 from the side connected to the end face (left side in FIG. 3). As a result, the brake member 40 is integrated with the lock knob 46 by the E ring 47.

  As shown in FIG. 7, a groove 40 </ b> B is formed on the outer peripheral surface of the brake member 40 so that the end surface on the tip end portion 46 </ b> B side of the screw portion 46 </ b> A can contact. Further, an anti-rotation groove 40 </ b> D is formed on the end surface of the brake member 40.

  As shown in FIG. 4, the longitudinal direction of the brake member 40 is provided along the direction orthogonal to the optical axis L, that is, along the circumferential direction of the focus ring 14.

  The first lens barrel body 12-1 is formed with a protruding portion 12B in which a hole 12A through which the lock knob 46 passes is formed (support mechanism). Further, the first lens barrel body 12-1 is formed with a rotation-preventing rib 12C. The rib 12C is inserted into the groove 40D and the groove 42C, so that the brake member 40 and the brake ring 42 are in the direction in which the rib 12C is formed with respect to the first lens barrel body 12-1, that is, in FIG. It can move only in the vertical direction (support mechanism).

  A method of locking the focus ring 14 using the thus configured lock mechanism will be described. As shown in FIG. 4, when the lock knob 46 is rotated and the lock knob 46 is screwed into the focus ring 14, the brake member 40 integrated with the lock knob 46 moves in a direction approaching the focus ring 14. . Since the non-rotating rib 12C and the groove 40D are provided in the vertical direction in FIG. 2, the brake member 40 moves downward in FIG. 2 (downward in FIG. 4). As a result, the brake member 40 contacts the focus ring 14. Since the brake member 40 is curved with substantially the same curvature as the focus ring 14, the entire inner peripheral surface of the brake member 40 contacts the focus ring 14. In order to further distribute the load applied to the focus ring 14 and prevent the focus ring 14 from being deformed, the length of the brake member 40 in the longitudinal direction is made longer and the longitudinal direction is along the circumferential direction of the focus ring 14. It is desirable to provide it.

  Further, when the lock knob 46 is rotated and the lock knob 46 is screwed into the focus ring 14, the brake ring 42 moves in the direction opposite to the brake member 40 (upward direction in FIG. 4). Since the non-rotating rib 12C and the groove 42C are provided in the vertical direction in FIG. 2, the brake ring 42 moves upward in FIG. 2 (upward in FIG. 4). As a result, the inner periphery of the brake ring 42 comes into contact with the focus ring 14. Since the brake ring 42 and the focus ring 14 have a clearance fit, no load is applied when the brake ring 42 moves.

  When the lock knob 46 is thus rotated and the lock knob 46 is screwed into the focus ring 14, the brake member 40 and the brake ring 42 press the focus ring 14 from above and below in FIG. The focus ring 14 is tightened so as not to be rotatable by 42 and the first barrel main body 12-1. That is, the focus ring 14 is locked (fixed).

[Operation]
As described above, in the surveillance camera lens device 10 according to the present embodiment, focusing is performed by rotating the focus ring 14, and zooming is performed by rotating the zoom ring 16.

  In zooming, when the zoom ring 16 is locked, the lock knob 50 is rotated, the tip of the lock knob 50 is moved away from the zoom ring 16, and the zoom ring 16 is unlocked. In this state, the zoom ring 16 is rotated and set to a desired focal length.

  When the desired focal length is set, the lock knob 50 is rotated, the tip of the lock knob 50 is brought into contact with the zoom ring 16, and the zoom ring 16 is locked. As a result, the zoom ring 16 cannot be rotated.

  On the other hand, in the case of focusing, when the focus ring 14 is locked, the focus ring 14 is unlocked. Specifically, the lock knob 46 is rotated from the locked state in FIG. 2, the brake member 40 is moved upward in FIG. 2, and the brake ring 42 is moved downward in FIG. As a result, as shown in FIG. 9, the brake member 40 and the brake ring 42 are separated from the outer peripheral surface of the focus ring 14, and the lock of the focus ring 14 is released. In this state, the focus ring makeup unit 44, that is, the focus ring 14, is rotated to set a desired in-focus position.

  When the desired focus position is set, the lock knob 46 is rotated to lock the focus ring 14. That is, the lock knob 46 is rotated in the direction opposite to the direction when the lock of the focus ring 14 is released, the brake member 40 is moved downward in FIG. 9, and the brake ring 42 is moved upward in FIG. As a result, the brake member 40 and the brake ring 42 are brought into contact with the outer peripheral surface of the focus ring 14, and the rotation of the zoom ring 16 is locked.

  According to the present embodiment, the focus ring 14 is locked by applying an equal force from two directions. Therefore, the focus ring 14 and the zoom ring 16 can be locked without applying an excessive load to the focus ring 14 from one place and without deforming the focus ring 14 and the lens barrel body 12.

  Further, according to the present embodiment, the brake member 40 and the focus ring 14 are in contact with each other on the surface. Furthermore, since the brake ring 42 is formed of an elastic member, the brake ring 42 and the focus ring 14 are in contact with each other on the surface. Therefore, the load is not concentrated on one place with respect to each of the loads applied to the focus ring 14 from the two upper and lower directions. Therefore, the focus ring 14 can be reliably locked without causing the optical system to be decentered or tilted.

  Further, since the lock knob 46 is provided so as to protrude in the normal direction of the focus ring 14 as in the case of the conventional lock knob, the user can easily perform the locking operation.

  In this embodiment, a rib 12C is formed on the first lens barrel body 12-1 as a detent, a groove 40D is formed on the brake member 40, and a groove 42C is formed on the brake ring 42. The lock knob 46 is formed integrally with the brake member 40 after passing through the hole 12A and the screw hole 42B, and can function as a detent. Therefore, the rib 12C, the hole 12A, and the screw hole 42B are indispensable. It is not a configuration.

  In the present embodiment, the brake ring 42 is formed of an elastic member so that the brake ring 42 and the focus ring 14 are brought into contact with each other on the surface, but the curvature in the vicinity of the top of the arc of the brake ring is changed to the outer periphery of the focus ring. The brake ring and the focus ring may be brought into contact with each other by forming so as to be substantially the same as the curvature. Even when the brake ring is formed of an elastic member, the curvature in the vicinity of the top of the arc of the brake ring may be formed to be substantially the same as the curvature of the outer periphery of the focus ring.

  In the present embodiment, the screw is formed on the lock knob 46 and the screw hole 42B is formed on the brake ring 42, so that the brake ring 42 moves in the opposite direction to the lock knob 46. The method of moving the brake ring 42 in the opposite direction is not limited to this. For example, instead of the screw 16A of the lock knob 46, a lock knob 51 in which a cam 51A as shown in FIG. 10 is formed may be provided. When the lock knob 51 is rotated, the brake member 40 and the brake ring 42 can be moved up and down in the opposite directions according to the contact position of the cam 51A.

<Modification 1>
In the present embodiment, the first lens barrel main body 12-1 is provided with the protruding portion 12B in which the hole 12A through which the lock knob 46 can pass is formed. However, the first lens barrel main body 12-1 has the lock knob 46. You may form the screw hole by which these are screwed together.

  FIG. 11 shows a modified example in which a screw hole into which a lock knob is screwed is formed in the first lens barrel body 12-1 '(fixed cylinder). In addition, about the part same as this Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  A screw hole 12D is formed in the protruding portion 12B of the first barrel main body 12-1 '. The screw direction of the screw hole 12D is opposite to the screw direction of the screw hole 42B. In the present embodiment, since the right screw is applied to the screw hole 42B, the screw hole 12D is a left screw.

  The lock knob 52 (lock knob) includes a screw portion 52A that is screwed into the screw hole 42B, a screw portion 52B that is screwed into the screw hole 12D, and a tip that is thinner than the screw portions 52A and 52B and is integrated with the brake member 40. Part 52C. Since the screw hole 42B is a right-hand screw, the screw portion 52A is a right-hand screw, and since the screw hole 12D is a left-hand screw, the screw portion 52B is a left-hand screw.

  When the lock knob 52 is rotated clockwise, the lock knob 52 moves in a direction (downward in FIG. 11) to be screwed into the first lens barrel body 12-1 '. As a result, the brake member 40 moves in the same direction as the lock knob 52 (downward in FIG. 11), and moves in the direction opposite to the movement direction of the brake ring 42 and the lock knob 52 (upward in FIG. 11). As a result, the focus ring 14 is locked (fixed) by the brake member 40 and the brake ring 42 pressing the focus ring 14 from the vertical direction in FIG.

<Modification 2>
In the present embodiment, the focus ring 14 is locked by bringing the brake member 40 and the brake ring 42 into contact with the focus ring 14 on the surface, but the brake member 40 and the brake ring 42 are applied to the focus ring 14 on the surface. The focus ring 14 can be locked without contact.

  In addition, when the lock knob 46 is tightened excessively or when the longitudinal direction of the brake member 40 is deformed and warped due to a change with time, the brake member 40 and the focus ring 14 are not two surfaces but two surfaces. There may be a case where contact is made at a line (two points when viewed in cross section). In addition, even when the brake ring 42 is formed of a material such as a metal that is hardly deformable, the brake ring 42 and the focus ring 14 are in contact with one line (one point when viewed in cross section) instead of a surface. Is also possible.

  FIG. 12 is a modified example in which the brake member 40 and the brake ring 42 are in contact with the focus ring 14 at a plurality of points. In addition, about the part same as this Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The brake member 54 (fixing member) is a plate-like member that is curved with substantially the same curvature as the focus ring 14. The brake member 54 is integrated with the lock knob 46 by an E ring 47, and the longitudinal direction is perpendicular to the optical axis L between the arc ring and the focus ring 14 that are not in contact with the outer periphery of the focus ring 14. It is provided along.

  A hole 54 </ b> A through which the lock knob 46 passes is formed substantially at the center of the brake member 54. A substantially U-shaped groove 54 </ b> B for inserting the E-ring 47 is formed on the surface of the brake member 54 facing the focus ring 14. Furthermore, a convex portion 54C (first convex portion) is formed in the vicinity of both ends on the surface of the brake member 54 on the side facing the focus ring 14. The distance between the two convex portions 54C is preferably as far as possible. In the present embodiment, the interval between the two convex portions 54C is 90 degrees. The convex portion 54C is preferably a rib along the optical axis direction.

  The brake ring 56 (ring member) is a cylindrical member in which an oblong hole 56A is formed. The hole 56 </ b> A is formed so that the distance between the opposing straight lines has a clearance fit that is about one hundredth of a millimeter larger than the diameter of the outer periphery of the focus ring 14. The brake ring 56 can be formed of various materials such as metal, plastic, and rubber that can be elastically deformed. However, the processing accuracy varies depending on the material, and in the case of metal, high processing accuracy is required. The brake ring 56 is formed with a screw hole 56B into which the lock knob 46 is screwed.

  Further, the brake ring 56 is formed with two convex portions 56C (second convex portions). The convex portion 56C is desirably a rib along the optical axis direction, like the convex portion 54C. The two convex portions 56C are provided on the straight line passing through the convex portion 54C and the optical axis L so as to face the convex portion 54C. Therefore, the interval between the two convex portions 54C is 90 degrees. Further, the interval between the convex portion 54C and the convex portion 56C is also 90 degrees.

  It should be noted that the convex portions 54C and the convex portions 56C are formed in such a size that the tips are located on a line having substantially the same curvature as the outer peripheral surface of the focus ring 14, that is, the line connecting the tips of the convex portions 54C is It is desirable that the curvature is substantially the same as that of the outer peripheral surface, and the line connecting the tips of the convex portions 56C has substantially the same curvature as that of the outer peripheral surface of the focus ring 14.

  When the lock knob 46 is rotated and the lock knob 46 is screwed into the focus ring 14, the brake member 54 integrated with the lock knob 46 moves in a direction approaching the focus ring 14. Since the lock knob 46 penetrates the hole 12A, the brake member 54 moves downward in FIG. As a result, the convex portion 54 </ b> C of the brake member 54 contacts the focus ring 14.

  When the lock knob 46 is rotated and the lock knob 46 is screwed into the focus ring 14, the brake ring 56 moves in the direction opposite to the brake member 40 (upward in FIG. 4). Since the lock knob 46 passes through the hole 12A, the brake ring 56 moves upward in FIG. As a result, the convex portion 56 </ b> C of the brake ring 56 contacts the focus ring 14. Since the brake ring 56 and the focus ring 14 have a clearance fit relationship, no load is applied when the brake ring 56 moves.

  When the lock knob 46 is thus rotated and the lock knob 46 is screwed into the focus ring 14, the convex portion 54 </ b> C of the brake member 54 and the convex portion 56 </ b> C of the brake ring 56 press the focus ring 14 from the vertical direction in FIG. 12. Thus, the focus ring 14 is tightened so as not to rotate and is locked (fixed).

  Thus, by forming a convex part in a brake ring and a brake member, a brake ring and a brake member can be made to contact a focus ring with a convex part. Therefore, by providing the convex portions every 90 °, it is possible to apply force to the focus ring at equal intervals.

  In addition, when the tip of the convex portion 54C and the convex portion 56C is formed with a size that is located on a line with substantially the same curvature as the outer peripheral surface of the focus ring 14, the convex portion 54C and the convex portion 56C are substantially simultaneously 14, and the convex portion 54 </ b> C and the convex portion 56 </ b> C are pressed against the focus ring 14 with substantially the same strength. Therefore, the effect of preventing the deformation of the lens barrel by dispersing the force can be further enhanced.

  In this modification, the convex portions 54C and the convex portions 56C are formed every 90 °, but the intervals between the convex portions 54C, the intervals between the convex portions 56C, and the intervals between the convex portions 54C and the convex portions 56C are 90 °. It is not limited to. Further, the number of the convex portions 54C and the convex portions 56C is not limited to two, and may be three, four, or the like. Moreover, both the convex part 54C and the convex part 56C are not essential, and only the convex part 54C may be sufficient, and only the convex part 56C may be sufficient.

  In the above embodiment, the lock mechanism according to the present invention is applied to the focus ring 14, but the present invention can be applied not only to the focus ring but also to all operation rings (for example, zoom ring) of the lens device.

10: Lens device for surveillance camera, 12: Lens barrel body, 12A: Hole, 12B: Projection, 12C: Rib, 12D: Screw hole, 14: Focus ring, 16: Zoom ring, 16A: Screw, 18: Zoom ring Cosmetic part, 18: zoom ring cosmetic cylinder, 18A: screw hole, 22: mount ring, 24: focus lens, 26: iris unit, 28: zoom lens, 30: focus lens frame, 32: zoom lens frame, 34: iris Meter, 40: brake member, 40A: groove, 40B: groove, 40C: hole, 40D: groove, 42: brake ring, 42A: hole, 42B: screw hole, 42C: groove, 44: focus ring decorative part, 46: Lock knob, 46A: Screw part, 46B: Tip part, 47: E-ring, 50: Lock knob, 51: Lock knob, 51A: Cam 52: Lock knob, 52A: Screw part, 52B: Screw part, 52C: Tip part, 54: Brake ring, 54: Brake member, 54A: Hole, 54B: Groove, 54C: Convex part, 56: Brake ring, 56A: Hole, 56B: Screw hole, 56C: Projection, L: Optical axis

Claims (7)

A movable lens supported movably on the lens barrel body;
An operation ring which is provided so as to be rotatable with respect to the lens barrel body and moves the moving lens in the optical axis direction by a rotation operation;
A substantially cylindrical ring member provided on the outer periphery of the operation ring;
A fixing member provided between the operation ring and the ring member;
A locking operation member provided between the ring member and the fixing member, wherein the fixing member integrated with the locking operation member is brought into contact with the operation ring by rotating and further rotated; A lock operating member for moving the ring member and the fixing member in opposite directions;
A support mechanism that supports at least one of the ring member and the lock operation member so as to be movable only in a direction perpendicular to the optical axis of the moving lens;
With
A monitoring camera lens device that rotates the lock operation member to move the ring member and the fixing member in opposite directions to tighten the operation ring in a non-rotatable manner.   The surveillance camera lens device according to claim 1, wherein the fixing member is a member whose surface in contact with the operation ring is curved with substantially the same curvature as the operation ring.   The 1st convex part which touches the said operation ring is formed in the said fixing member in the magnitude | size in which the front-end | tip is located in the line | wire of the curvature substantially the same as the outer peripheral surface of the said operation ring. Lens device for surveillance cameras.   The surveillance camera lens device according to claim 3, wherein the first convex portions are formed approximately every 90 °.   The surveillance camera lens device according to claim 3, wherein a second convex portion is formed on the ring member at a position facing the first convex portion. The lens barrel body is formed with a hole in a direction perpendicular to the optical axis of the moving lens,
The surveillance camera lens device according to claim 1, wherein the support mechanism is configured by the lock operation member being passed through the hole. The lens barrel body has a substantially cylindrical tube portion provided inside the operation ring, and a flange portion formed so as to abut on an end surface of the ring member,
6. A convex portion in a direction orthogonal to the optical axis of the moving lens and a groove engaging with the convex portion are formed as the support mechanism on surfaces of the flange portion and the ring member that are in contact with each other. The lens device for a surveillance camera according to any one of the above.

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