WO2010106921A1 - Lens loosening prevention member and camera unit - Google Patents

Abstract

A technique which, in normal use of a camera, reliably prevents loosening of the screw thread engagement between a body and a lens barrel and which, in lens interchanging operation, enables the lens barrel to be removed from the body without causing damage to the camera. A lens loosening prevention member is provided with: a tube body section (41) which covers both an engaging groove (23) and a catch claw (33) with a body-side cylindrical section (21) and a barrel-side cylindrical section (31) engaged with each other through screw threads; an engaging plate (42) which has a shape complementary to the engaging groove (23) and is provided to the tube body section (41) so as to be fitted to the engaging groove (23) from the optical axis direction; and an engaging claw (43) which is provided to the tube body section (41) so as to be engaged with the catch claw (33) and which, in a state in which the engaging plate (42) is engaged with the engaging groove (23), restricts the rotation of the catch claw (33) only in the direction in which the screw thread engagement is released.

Description

Lens loosening prevention member and camera unit

The present invention relates to a lens slack prevention member applied to a camera adopting a screw connection method, and a camera unit provided with the lens slack prevention member.

In a lens-interchangeable camera, a lens mount for mounting a lens barrel containing a lens is provided on the body of the camera. Further, as a lens mount mechanism, there is known a screw-type mount in which a lens barrel is connected to a body main body by screwing screw grooves provided on both the body main body side and the lens barrel side. Generally, the lens mount of a camera is standardized (standardized) in the screw diameter, pitch, flange back, etc. in the screw groove for screwing the lens barrel to the body body (for example, C mount, CS mount, etc.) There are some that are called).

Also, conventionally, CCD cameras using CCDs (Charge Coupled Devices) as imaging elements and CMOS cameras using Complementary Metal-Oxide Semiconductors (CMOSs) are part shape measurement and position recognition in production lines in the factory. It is widely used in vibration environments such as FA (Factory Automation) applications such as inspection, monitoring applications, and in-vehicle applications.

Here, when a camera adopting a screw connection method is used for FA application, monitoring application, in-vehicle application, etc., the body main body and the lens barrel are fixed only by screwing of the screw groove, so vibration over a long time When exposed to the environment, there is a fact that the screwing of the screw groove is likely to be loosened. It goes without saying that the on-vehicle camera is exposed to the vibration environment, but the camera for FA is always exposed to the vibration environment particularly when attached to a robot arm or the like. In addition, in the case of a surveillance camera, when pan operation and tilt operation (hereinafter collectively referred to as "pan and tilt operation") are frequently used, the screw engagement of the lens unit is also easily loosened.

Such loosening of the lens barrel with respect to the body of the camera leads to the following problems. That is, the lens focus position is misaligned due to the lens barrel being loosened, and so-called focus shift occurs (hereinafter referred to as "lens focus position" in the specification, "lens back focus Say "position"). Misfocusing causes most of the essential functions of the camera to be lost. Further, when the loosening of screwing between the main body and the lens barrel progresses, the lens barrel eventually drops from the main body, which causes the lens barrel to be damaged. Further, in the case of FA application, in particular, when the lens barrel of the camera fixed to the robot arm which can not operate at high speed is detached from the body main body, the inertia force causes the lens barrel to jump out at high speed. There is a risk. In addition, when the lens barrel is loosened or dropped, it is necessary to temporarily stop the operation of the production line, which may cause a large economic loss.

In view of the above-mentioned situation, conventionally, the body main body and the lens barrel in a state of being connected by screwing of the screw groove are further subjected to measures against the looseness using a set screw or the like. However, since this set screw is also a screw member, it is eventually loosened by being exposed to the vibration environment. In other words, the measure for preventing the lens barrel from being loosened by the set screw is only to slightly delay the start time of the lens barrel loosening, and it is not a fundamental solution.

Furthermore, in order to prevent loosening of the set screw, it is also common to pour an adhesive (for example, a screw lock or the like) into the screw portion. However, since the application of the adhesive in this type is often performed manually, it is difficult to apply an appropriate amount of adhesive to an appropriate site. Therefore, the effect of preventing the loosening of the screw may not be sufficiently exhibited. In addition, when the adhesive is applied to the screw portion in this manner, the adhesive remains in the screw hole even after the lens barrel has been artificially removed from the main body at the time of lens replacement or the like. Then, again, in order to connect the lens barrel to the main body of the body, it is inconvenient to remove the adhesive remaining in the screw holes of the set screw.

In this regard, Patent Document 1 discloses a technique for preventing loosening of screwing due to vibration. In the lens fixing structure disclosed in this conventional document, a first cylindrical body (inner cylinder) having a screw groove formed on the outer peripheral surface, and a screw groove engaged with the screw groove are formed on the inner peripheral surface. A second cylinder (an outer cylinder) and a lens holding portion provided on the second cylinder, the first and second cylinders being rotated along the screw grooves. The lens is sandwiched and fixed between one end of the lens and the lens holding portion. Then, the inner circumferential surface of the second cylindrical body is engaged with the first claw portion provided on the outer circumferential surface of the first cylindrical body to release the screwing of the first and second cylindrical bodies. A second pawl is formed to lock rotation in the direction, securing the lens in a non-removable manner.

JP 2007-322548 A

When the above-mentioned prior art is applied to a connection structure between a camera body and a lens barrel provided with a screw-in mount, the loosening of the body and the lens barrel is surely prevented even under a long-term vibration environment. Can. However, in this configuration, when the lens barrel (lens) is intentionally (artificially) removed from the body main body, it is necessary to destroy or damage a part of camera components (body main body and lens barrel) is there.

The present invention has been made to solve the above-mentioned problems of the prior art, and the object of the present invention is applied to a camera adopting a screw connection method, and the body body and lens barrel in normal use of the camera. It is an object of the present invention to provide a lens loosening prevention member which reliably prevents the screw from loosening, and can remove the lens barrel from the body without damaging the camera upon lens replacement.

In order to solve the above-mentioned subject, the lens looseness prevention member concerning the present invention adopted the following means.

That is, the threaded portion of the first cylindrical body of either the camera body or the lens barrel and the threaded portion of the second cylindrical body of the other are screwed together to connect the body and the lens barrel. And the first engaging portion is recessed or protruded on the outer peripheral surface of the first cylindrical body, and the present invention is applied to a camera in which the first engaging claw portion is provided on the outer peripheral surface of the second cylindrical body. A cylinder main body which is a lens looseness prevention member to be covered and which covers the first locking portion and the first engagement claw portion in a state in which the first and second cylinders are screwed together An inner periphery of one end edge side of the cylinder main body portion so as to have a shape complementary to the portion and the first locking portion and be fitted to the first locking portion from the optical axis direction Provided on the inner peripheral surface on the other end edge side of the cylinder main body portion so as to engage with the second engaging portion provided on the surface and the first engaging claw portion, and In the state where the second locking portion is fitted to the first locking portion, the rotation of the first engaging claw portion only in the direction for releasing the screwing of the first and second cylindrical bodies. And a second engaging claw portion for restricting

According to this configuration, the rotation of the first engagement claw portion in the direction in which the first and second cylindrical members proceed with screwing is permitted. Therefore, when mounting the lens barrel to the body main body, Screwing of the first and second cylindrical bodies can be smoothly performed.

In addition, when a force is applied in a direction in which the first and second cylindrical members are unscrewed, the first and second cylinders are engaged in a state in which the second locking portion is fitted to the first locking portion. The rotation of the first engagement claws in the direction of releasing the screwing of the body is restricted. Here, in the state where the second locking portion is fitted to the first locking portion, the relative rotation in the circumferential direction of the first cylindrical body and the cylinder main body is restricted, so It is possible to suppress relative rotation of the two cylinders in the direction in which the screwing is released. Therefore, it is possible to reliably suppress the occurrence of loosening of the lens barrel during normal use after mounting the camera body and the lens barrel.

Further, the first engaging claw portion is inclined in the circumferential direction compared with the first radial surface extended in the radial direction from the outer peripheral surface of the second cylindrical body, and the first radial surface. The second engaging claw portion is formed to extend in the radial direction from the inner peripheral surface of the cylinder main body portion. A second radial surface opposed to the first radial surface, and a second radial surface which is inclined and extended in the circumferential direction compared with the second radial surface and a second opposed to the first inclined surface The first engaging claw portion is rotated in the direction in which the first and second cylindrical members are screwed together. When the inclined surface abuts and the first engaging claw rotates in a direction to release the screwing of the first and second cylinders, the first and second radial surfaces abut Even good .

According to this configuration, when the first engaging claw rotates in the direction in which the first and second cylindrical members are screwed together, the first and second inclined surfaces abut each other. In this case, the direction in which the first and second cylindrical members are screwed together with some elastic deformation in at least one of the first engagement claw portion and the second engagement claw portion although resistance to rotation is increased. Rotation of the first engagement pawl is permitted.

On the other hand, when the first engaging claw rotates in the direction in which the first and second cylindrical members are unscrewed (when it is about to rotate), the first and second radial direction surfaces Will abut. The first and second radial surfaces are provided to face each other in the rotational direction. Therefore, when the first and second radial surfaces abut each other, the rotation of the first engagement claw portion in the direction of releasing the screwing of the first and second cylindrical bodies is restricted.

Further, the lens loosening prevention member according to the present invention is an accessory that is externally fitted to a connecting portion between a body main body and a lens barrel in a camera. Therefore, when the lens barrel (lens) is intentionally (artificially) removed from the main body of the body, as in the case of lens replacement, it suffices to destroy the lens looseness prevention member as an accessory part, without damaging the camera. The lens barrel can be removed from the main body.

In the present invention, the second engagement claws may be continuously arranged in the circumferential direction along substantially the entire circumference of the inner peripheral surface of the cylinder main body. Then, since the first engagement claws always engage with any of the second engagement claws, the first engagement claw may release the screwing of the first and second cylindrical members. The amount of rotation of the first engaging claw can be reduced as much as possible.

Further, the lens loosening prevention member according to the present invention is preferably formed of a resin. According to this, since it can be easily destroyed at the time of lens replacement, it does not take time and effort when removing the lens barrel from the body main body. Moreover, the manufacturing cost can be held down by molding with resin.

Further, in the present invention, a cutting guide portion which is easier to cut than the other portions may be provided from one end edge to the other end edge in the cylinder main body. For example, the cutting guide portion may be a thin-walled portion in which the thickness of the cylinder main body portion is smaller than that of other portions. As a result, when changing the lens, the lens barrel can be easily removed by cutting the lens loosening prevention member along the cutting guide.

Further, it is preferable that a knob portion on which a force for separating the cutting guide portion from the other portion acts is provided around the cutting guide portion in the cylinder main body portion. For example, the cylinder main body portion is provided with a plurality of the cutting guide portions, and the knob portion is a flange piece extended from an end edge portion of a portion sandwiched by two adjacent cutting guide portions. It may be According to this, it is not necessary to use a cutting tool such as a cutter when cutting the lens loosening prevention member. For example, the cutting guide portion can be easily separated from the other portions simply by manually gripping the flange piece and applying a force in the out-of-plane direction of the cylinder main body portion. Therefore, the workability regarding lens exchange can be improved.

Further, in the present invention, the width dimension in the axial direction of the cylinder main body portion is a camera body main body or a camera when the screwing amount of the first and second cylindrical members reaches a predetermined screwing amount set in advance. The end edge portion of the cylinder main body may be adjusted to abut on the lens barrel, and the prescribed screwing amount may be set according to any lens focal position.

Here, when the screwing amount of the first and second cylindrical bodies changes, the lens focal position changes. Then, according to this configuration, the screwing amount can be reliably reached to the specified screwing amount, and the screwing amount does not exceed the specified screwing amount. Therefore, the lens focal position can be reliably adjusted to a desired position. For example, when a plurality of lens focus positions are set, it is preferable to prepare a lens loosening prevention member in which the width dimension of the cylinder main body is different for each setting of the prescribed screwing amount. And when changing a lens focus position, it is good to replace a lens looseness prevention member with what has a width size corresponding to the lens focus position. According to this, it is not necessary to prepare a large number of spacer rings and the like for each desired lens focus position, and the lens focus position can be changed easily and at low cost.

The present invention can be grasped as a camera unit configured to include any one of the lens slack prevention members described above and a body and lens barrel in a camera to which the lens slack prevention member is applied. Further, means for solving the problems in the present invention can be combined as much as possible.

According to the present invention, during normal use of the camera adopting the screw connection method, it is possible to reliably prevent the screwing of the body and the lens barrel from being loosened, and from the body without damaging the camera when replacing the lens. It is possible to provide a lens loosening prevention member capable of removing the lens barrel.

FIG. 1 is a perspective view showing the appearance of a camera to which a lens slack prevention member in Example 1 is applied. It is a disassembled perspective view of the characteristic part of the camera shown in FIG. When mounting the lens barrel to the body main body, it is an explanatory view for explaining a situation where a locking plate is fitted in the locking groove from the optical axis direction. It is an explanatory view for explaining the detailed composition of an engaged claw and an engaging claw. FIG. 18 is an exploded perspective view of a camera unit including the lens loosening prevention member and the camera in Embodiment 2. FIG. 13 is a perspective view of a lens loosening prevention member according to a second embodiment of the present invention mounted on a camera.

DETAILED DESCRIPTION Exemplary embodiments of the present invention will be exemplarily described in detail below with reference to the drawings. The dimensions, materials, shapes, relative arrangements, and the like of the components described in the present embodiment are not intended to limit the technical scope of the invention to these alone, unless otherwise specified.

Example 1
FIG. 1 is a perspective view showing the appearance of a camera to which the lens loosening prevention member in this embodiment is applied. FIG. 2 is an exploded perspective view of a characteristic part of the camera shown in FIG. The camera 1 shown in FIGS. 1 and 2 is a so-called interchangeable lens type CCD camera in which a CCD (Charge Coupled Device) is used as an imaging device and a lens can be exchanged. The camera 1 is mainly composed of a body main body 2 and a lens unit 3 which is a lens unit accommodating a lens inside and is connected to the body main body 2 by screwing. In the present embodiment, the type of the imaging device of the camera 1 is not an essential part, and another imaging device (for example, a CMOS or the like) to be substituted for this can be appropriately adopted.

As shown in FIG. 2, the lens barrel 3 is configured so as to be removable from the body main body 2 by a screw method, and lenses used for the camera 1 can be replaced according to the purpose of use. The structure of the connecting portion of the body 2 and the lens barrel 3 will be described. The body 2 and the lens barrel 3 are provided with the body side cylindrical portion 21 and the barrel side cylindrical portion 31 formed in a cylindrical shape, respectively. It is done. The inner diameter of the main body side cylindrical portion 21 is substantially equal to the outer diameter of the barrel side cylindrical portion 31. The inner peripheral surface on the open end side of the body main body side cylindrical portion 21 and the outer peripheral surface on the open end side of the barrel side cylindrical portion 31 are formed with screw portions 22 and 32 to be screwed together. .

In the body 2 and the lens barrel 3 configured as described above, the lens barrel side cylindrical portion 31 is rotated in one direction with respect to the body main body side cylindrical portion 21 so that the screw portion 22 of the body main body side cylindrical portion 21 and the mirror The amount of engagement of the screw portion 32 of the cylinder side cylindrical portion 31 is increased, and these screwing progresses. Hereinafter, expressions such as “screwing is performed”, “screwing proceeds”, “the amount of screwing is increased” and the like are generally used in the same meaning. Further, screwing of the main body 2 (body main body side cylindrical portion 21) and the lens barrel 3 (lens barrel side cylindrical portion 31) means screwing of the respective screw portions 22 and 32. Here, the relative rotation direction of the lens barrel side cylindrical portion 31 with respect to the body main body side cylindrical portion 21 when the screwing of the body main body side cylindrical portion 21 and the lens barrel side cylindrical portion 31 progresses is referred to as “screwing advancing direction”. It is called, and the direction of reverse rotation is called "screwing release direction". In the camera 1, the body main body 2 and the lens barrel 3 are connected by rotating the barrel side cylindrical portion 31 in the screwing advancing direction with respect to the body main body side cylindrical portion 21. Conversely, by rotating both of the fixed members in the screwing release direction, the screwing is released, and the lens barrel 3 can be finally removed from the body 2.

Further, the main body side cylindrical portion 21 and the barrel side cylindrical portion 31 of the present embodiment are coaxial. Then, in a state in which the screw portions 22 and 32 are screwed together, the body main body side cylindrical portion 21 and the lens barrel side cylindrical portion 31 are coaxial, and these axes are configured to coincide with the optical axis. In addition, a standardized standard mount (for example, a C mount, a CS mount, etc.) is adopted for the screwing portion of the body main body side cylindrical portion 21 and the lens barrel side cylindrical portion 31 generally referred to as a lens mount. The screw diameter, pitch, flange back, etc. are standardized (standardized).

The code | symbol 4 in FIG.1 and FIG.2 represents the lens looseness prevention member for preventing the looseness of the screwing in the body main body 2 and the lens barrel 3. As shown in FIG. The lens loosening prevention member 4 is made of resin. Hereinafter, with reference to FIG. 2, the detailed configurations of the main body side cylindrical portion 21, the barrel side cylindrical portion 31 and the lens loosening prevention member 4 will be described.

A locking groove 23 having a long groove shape is recessed from the open end of the outer peripheral surface of the body main body side cylindrical portion 21 along the axial direction of the body main side cylindrical portion 21 from the open end. In this figure, a single locking groove 23 is provided on the outer peripheral surface of the main body side cylindrical portion 21. However, a plurality of locking grooves 23 may be arranged in the circumferential direction of the outer peripheral surface. On the other hand, a plurality of engaged claws 33 is provided on the outer peripheral surface of the barrel side cylindrical portion 31. As for the detailed arrangement position, the engaged claw 33 is provided at a position (that is, a portion on the lens barrel 3 side) farther from the open end than the screw portion 32 of the barrel side cylindrical portion 31.

On the other hand, the lens loosening prevention member 4 is engaged with the engagement groove 23 described above in a state in which the body body 2 (body main body side cylindrical portion 21) and the lens barrel 3 (lens barrel side cylindrical portion 31) are screwed together. It is comprised from the cylindrical-shaped cylinder main-body part 41 fitted so that the joint claw 33 may be covered, the locking plate 42 mentioned later, and the engagement claw 43. As shown in FIG. Then, in a state where the lens looseness prevention member 4 is externally fitted to the outer peripheral side of the body main body side cylindrical portion 21 and the lens barrel side cylindrical portion 31, by rotating them relative to each other along the screw portions 22 and 32, Connection (fixing, mounting) of the lens barrel 3 to the body 2 is performed.

Here, among the end edges of the cylinder main body portion 41, when screwing together the body 2 and the lens barrel 3, the end edge on the one end side facing the body main body 2 is referred to as "body body side end edge 41a" The end edge on the other end side (that is, the end edge facing the lens barrel 3) is referred to as a "barrel side end edge 41b". As shown in FIG. 2, the inner peripheral surface of the cylinder main body portion 41 is a portion on the side of the body main body side end edge 41 a with an intermediate position in the axial direction of the outer cylinder main body portion 41 (hereinafter referred to as “body main body side inner periphery The shape is different between the surface 41c and the portion on the lens barrel side end edge 41b side (hereinafter referred to as "lens barrel side inner peripheral surface 41d").

A long plate-shaped locking plate 42 is provided in a protruding manner along the axial direction of the cylinder main body portion 41 on the above-mentioned body main body side inner circumferential surface 41 c. The locking plate 42 has a shape complementary to the locking groove 23 recessed in the outer peripheral surface of the body main body side cylindrical portion 21. That is, the long plate according to the locking plate 42 is fitted to the long groove according to the locking groove 23 with almost no gap. On the other hand, on the lens barrel side inner peripheral surface 41 d of the cylinder main body portion 41, a plurality of engaging claws 43 are provided in parallel in the circumferential direction. Further, the inner diameter of the body main body side inner peripheral surface 41 c in the cylinder main body portion 41 is made substantially equal to or slightly larger than the outer diameter of the body main body side cylindrical portion 21.

Here, with respect to the state when transitioning from the state of FIG. 2 to the state of FIG. 1, that is, the state when attaching the lens barrel 3 to the body 2, the relationship between the locking groove 23 and the locking plate 42, The relationship between the engaged claw 33 and the engaging claw 43 will be mainly described. FIG. 3 is an explanatory view for explaining a situation in which the locking plate 42 is fitted in the locking groove 23 in the optical axis direction when the lens barrel 3 is attached to the body 2. Specifically, the positions in the circumferential direction of the locking plate 42 convexly provided on the inner peripheral surface 41c on the main body side of the cylinder main body portion 41 and the locking groove 23 recessed on the cylindrical main body portion 21 are matched The partial cross section of the main body side cylindrical part 21 and the cylinder main body part 41 in the state which was made to represent is shown. The dashed line in the figure represents the axis of the main body side cylindrical portion 21. When mounting the lens barrel 3 on the body 2, the positioning of the locking groove 23 and the locking plate 42 in the circumferential direction is performed, and then the cylinder main portion 41 is mounted on the body main cylindrical portion 21. It is slid along the optical axis direction (parallel to the axis of the body side cylinder 21). As a result, the locking plate 42 provided on the body main body side inner peripheral surface 41c of the cylinder main body 41 is fitted in the locking groove 23 of the body main body cylindrical portion 21 in the optical axis direction (optical axis direction Is represented by an arrow in the figure).

Each of the axial length of the locking groove 23 formed in the body main body side cylindrical portion 21 and the axial length of the locking plate 42 formed in the cylinder main portion 41 And “locking plate length”. In the present embodiment, the locking plate length is set to be equal to or less than the locking groove length, and the entire locking plate 42 is inserted into the locking groove 23. In this manner, when the locking plate 42 is inserted into the locking groove 23 to the end, the cylinder main body portion 41 does not approach the body main body 2 side any more, and the body main body 2 and the lens loosening prevention member 4 The relative positional relationship in the optical axis direction of each part is determined (fixed). Then, in the state where the locking plate 42 is fitted in the locking groove 23 in this manner, in the circumferential direction of the body main body side cylindrical portion 21 of the body main body 2 and the cylinder main portion 41 of the lens loosening prevention member 4. Relative rotation is restricted (prohibited).

Next, when the body 2 and the lens barrel 3 are connected, engagement between the engaged claw 33 provided on the barrel side cylindrical portion 31 and the engagement claw 43 provided on the lens barrel side inner peripheral surface 41 d Will be explained. As described above, screwing of the body 2 and the lens barrel 3 is achieved by fitting the locking groove 23 of the lens loosening prevention member 4 to the locking plate 42 of the cylindrical portion 21 of the body main body. This is performed by rotating the side cylindrical portion 31 with respect to the body main body side cylindrical portion 21 in the screwing advancing direction. At that time, in the present embodiment, the engaging claws 43 of the inner peripheral surface 41 d of the barrel and the engaged claws 33 of the cylindrical barrel 31 are engaged with each other. FIG. 4 is an explanatory view for explaining a detailed configuration of the engaged claw 33 and the engagement claw 43. As shown in FIG. Specifically, the optical axis orthogonal cross section of the lens loosening prevention member 4 and the lens barrel 3 when the screw portion 22 of the body main body side cylindrical portion 21 and the screw portion 32 of the lens barrel side cylindrical portion 31 are in meshing state Represent.

The engagement claw 33 has a wedge shape whose cross section is a substantially right triangle, and has a first radial surface 33 a extending outward in the radial direction of the lens barrel side cylindrical portion 31, and a first diameter The first inclined surface 33 b is inclined in the circumferential direction from the outermost end of the direction surface 33 a toward the outer peripheral surface of the barrel side cylindrical portion 31. Here, the first inclined surface 33 b is extended in the circumferential direction so as to be inclined relative to the first radial surface 33 a. Further, the engaged claws 33 are juxtaposed in the same direction at substantially equal intervals (every 90 degrees in this figure) along the circumferential direction on the outer peripheral surface of the barrel side cylindrical portion 31.

On the other hand, the engaging claw 43 also has a wedge shape having a substantially right triangle in cross section, and a second radial surface 43a extending inward in the radial direction of the cylinder main body 41, and the second diameter. A second inclined surface 43b is inclined in the circumferential direction from the innermost end of the direction surface 43a toward the lens barrel side inner peripheral surface 41d. Here, the second inclined surface 43b is extended in the circumferential direction so as to be inclined relative to the second radial surface 43a. In addition, the engagement claws 43 are arranged in the same direction continuously (without a gap) along the circumferential direction of the barrel side inner peripheral surface 41 d of the barrel main body portion 41 continuously (without a gap).

As illustrated, the outermost end of the engaged claw 33 formed on the outer peripheral surface of the lens barrel side cylindrical portion 31 is the engagement claw 43 formed on the lens barrel side inner peripheral surface 41 d of the cylinder main body portion 41. It is formed to be a position outside the innermost end. The first radial surface 33 a of the engaged claw 33 faces the second radial surface 33 a of the engaging claw 43, and the first inclined surface 33 b of the engaged claw 33 corresponds to the engaging claw 43. It is formed to face the second inclined surface 33b. The innermost end of the engagement claw 43 in the inner peripheral surface 41 d of the barrel main body 41 is on the outer side than the outermost end of the screw portion 32 formed on the outer peripheral surface of the barrel 31. Thus, the screw portion 32 can be screwed with the screw portion 22 without contacting the screw portion 32 with the engagement claw 43.

In a state where the locking groove 23 of the lens loosening prevention member 4 is fitted to the locking plate 42 of the body main body side cylindrical portion 21, the peripheries of the body main side cylindrical portion 21 and the lens loosening prevention member 4 (cylinder main body portion 41) The relative rotation in the direction is restricted. Therefore, when the barrel side cylindrical portion 31 is rotated in the screwing advancing direction in this state, the barrel side cylindrical portion 31 rotates relative to the barrel main body portion 41 (in the direction of arrow A in the figure). That is, the direction of the arrow A in the drawing corresponds to the direction in which the barrel side cylindrical portion 31 is screwed with the body main body side cylindrical portion 21.

As described above, when the barrel side cylindrical portion 31 rotates in the direction of arrow A with respect to the cylinder main body portion 41, the second inclined surface 43b of the engagement claw 43 is engaged with the first engagement claw 33 with the rotation. Contact with the inclined surface 33b of In other words, when the engaged claw 33 rotates in the screwing advancing direction of the body main body side cylindrical portion 21 and the barrel side cylindrical portion 31, the first and second inclined surfaces 33b and 43b abut each other. In this state, although resistance to rotation is increased, by applying a slightly large force in the direction of arrow A, at least one of the engagement claws 43 and the engagement claws 33 has a slight elastic deformation on the lens barrel side. The cylindrical portion 31 can be further rotated relative to each other.

On the other hand, when attempting to rotate the barrel side cylindrical portion 31 in the screwing release direction (that is, the direction opposite to the arrow A), the second radial surface 43a of the engaging claw 43 is engaged with the rotation. It abuts on the first radial surface 33 a of the dowel 33. In other words, when the engaged claw 33 rotates in the screwing release direction of the main body side cylindrical portion 21 and the barrel side cylindrical portion 31, the first and second radial surfaces 33a and 43a abut each other. . In this state, since the locking groove 23 of the lens loosening prevention member 4 is fitted to the locking plate 42 of the body main body side cylindrical portion 21, the body main body side cylindrical portion of the cylinder body 41 in the lens loosening prevention member 4 Rotation in the circumferential direction with respect to 21 is restricted. Furthermore, the first and second radial surfaces 33a and 43a are provided in a direction substantially orthogonal to the rotation direction. Therefore, when the first and second radial surfaces 33a and 43a abut on each other, the engagement claws 33 of the barrel side cylindrical portion 31 are no longer restricted to rotate in the direction opposite to the arrow A. . As a result, the rotation of the barrel side cylindrical portion 31 in the screwing release direction is prohibited.

By the above, the engagement claw 43 of the lens loosening prevention member 4 engages with the engagement claw 33 formed on the outer peripheral surface of the lens barrel side cylindrical portion 31. 41d and restricts the rotation of the engaged claw 33 only in the screwing release direction in a state where the locking plate 42 is fitted in the locking groove 23. Therefore, when the lens barrel 3 is attached to the body 2, the relative rotation in the screwing direction of the lens barrel 3 is not impeded at all, and smooth attachment is realized. Further, after the lens barrel 3 is fixed, relative rotation in the screwing release direction of the lens barrel 3 is restricted, so that the lens barrel 3 is not loosened.

By the way, when performing lens replacement, it is necessary to intentionally (positively) remove the lens barrel 3 fixed to the body 2 from the body 2. Therefore, in the cylindrical body portion 41 of the lens loosening prevention member 4 in the present embodiment, the cutting guide portion 44 which is easy to cut from the body body side end edge 41a to the lens barrel side end edge 41b compared to the other portions is linear. (See Figures 2 and 4). The “other part” mentioned here corresponds to, for example, a part adjacent to the cutting guide part 44 in the cylinder main body part 41. Specifically, a thin-walled portion 44a in which a groove is formed in the axial direction from the body-body-side end edge 41a to the lens-barrel-side end edge 41b is provided on the outer peripheral surface of the cylinder body portion 41.

Since the lens loosening prevention member 4 is made of resin, by making the member thickness (thickness) of the thin-walled portion 44a smaller than that of other portions where the groove is not formed, the thin-walled portion 44a is compared to the other portions. Can be cut easily. In the present embodiment, the cutting guide portion 44 is configured by the thin portion 44a. The thickness of the thin portion 44a may be set to such a thickness that the thin portion 44a can be cut without difficulty if the blade of a cutter such as a cutter is applied to the thin portion 44a with an appropriate force (for example, 1.0 mm) Less than). Further, with regard to the specific thickness, an optimum value can be obtained in advance based on a rule of thumb.

Moreover, the cutting guide part 44 can employ | adopt another form, if it is easy to cut compared with another part. For example, instead of making the member thickness of the cutting guide portion 44 smaller than that of other portions, or in combination therewith, the cutting guide portion 44 may be made of a material that is easy to cut compared to other portions. For example, the material strength of the cutting guide portion 44 may be lower than that of other portions.

With this configuration, the lens loosening prevention member 4 can be easily cut along the cutting guide portion 44 when the lens of the camera 1 is replaced. Therefore, the lens barrel 3 can be removed from the body 2 and lens replacement can be performed smoothly and easily. Further, since the screwing of the lens barrel 3 can be released only by the operation of cutting the lens loosening prevention member 4 which is an attached member of the camera 1, the camera 1 (body main body 2, lens barrel 3) Etc.), and it is not necessary to apply a large force, which is preferable.

Also, the lens loosening prevention member 4 broken (cut, broken, etc.) at the time of lens replacement is usually discarded, and another new lens loosening prevention member 4 is attached to the camera 1 after lens replacement. That is, although the lens loosening prevention member 4 is handled as a so-called disposable member, the manufacturing cost can be suppressed to be relatively low by making the material of the lens made of resin or the like, and therefore the cost effectiveness is large.

The camera 1 to which the lens loosening prevention member 4 is applied is in a vibration environment such as FA (Factory Automation) applications such as shape measurement, position recognition and inspection of parts in a production line in a factory, monitoring applications, and in-vehicle applications. In the case of a camera to be used, the function and effect of the lens loosening prevention member 4 are particularly remarkably exhibited. It goes without saying that the on-vehicle camera is exposed to the vibration environment, but in the FA camera, particularly when attached to the robot arm, it is always exposed to the vibration environment. Further, in the case of a surveillance camera, when pan and tilt operations are frequently used, the screwing of the lens barrel 3 also tends to be loosened. Therefore, when the camera 1 adopting the screw connection method is used for FA application, monitoring application, in-vehicle application, etc., the body 2 and the lens barrel 3 are fixed only by screwing of the screw part, so under vibration environment In this case, the lens barrel 3 is easily loosened.

In the conventional camera, the lens barrel is screwed to the body, and the set screw is used to further increase the degree of fixation of the lens, so that the lens is prevented from becoming loose. Although it was possible to postpone the start of the slack a little, there was a fact that it did not reach the fundamental solution. On the other hand, no screw mechanism intervenes in the lens loosening prevention member 4 at all. Therefore, even if the period of exposure to vibration environment such as FA application, monitoring application, and in-vehicle application is extended for a long time, as long as the lens looseness preventing member 4 is not broken intentionally as in lens replacement Loosening is reliably suppressed. As a result, the lens focal position is not misaligned (so-called out-of-focus), and the essential function as a camera is well maintained. Therefore, the reliability of the camera 1 can be improved.

Also, as a matter of course, there is no risk of the lens barrel 3 falling from the body 2 and being damaged. Therefore, it is possible to reliably avoid suffering a great economic loss due to a situation where the operation of the production line has to be stopped due to a focus shift or the falling of the lens barrel 3 . Also, in the case of a camera for FA attached to a robot arm that operates at high speed, the lens loosens a situation where the lens barrel 3 flies in the air at high speed due to a reaction when the lens barrel 3 is removed from the body 2 By applying the preventing member 4, it can be reliably avoided. Further, according to the lens loosening prevention member 4, since lens replacement can be easily performed, it is convenient to apply to a camera for FA application in which the lens focal distance required according to the product is different.

Further, in order to prevent the set screw from being loosened, an adhesive such as a screw lock is conventionally applied to the screw portion, but the adhesive application operation is often performed manually. Therefore, it is difficult to apply the adhesive properly, and the effect of preventing the loosening of the screw may not be sufficiently exhibited. Moreover, with this type of adhesive, when the lens barrel is artificially removed from the body at the time of lens replacement, the adhesive remains in the screw holes of the set screw. Then, when the lens barrel is attached to the body again, the adhesive remaining in the screw hole needs to be removed in advance, which takes time and effort. On the other hand, according to the lens loosening prevention member 4 of the present embodiment, the lens barrel 3 can be easily removed from the main body 2 simply by cutting the lens loosening prevention member 4 along the cutting guide portion 44 when replacing the lens. Work efficiency is good because you can. In addition, since the lens loosening prevention member 4 itself cut at the time of lens replacement is discarded, fine debris and the like are not generated, which is preferable.

In the present embodiment, the body main body side cylindrical portion 21 in the body main body 2 and the barrel side cylindrical portion 31 in the lens barrel 3 correspond to the first cylinder and the second cylinder in the present invention, respectively. In addition, the locking groove 23 recessed in the outer peripheral surface of the body main body side cylindrical portion 21 and the locking plate 42 protruded in the inner peripheral surface (body main body side inner peripheral surface 41 c) of the cylinder main portion 41 The present invention corresponds to a first locking portion and a second locking portion in the present invention. Further, the engagement claw 33 provided on the outer peripheral surface of the barrel side cylindrical portion 31 and the engagement claw 43 formed on the inner peripheral surface (barrel side inner peripheral surface 41 d) of the cylinder main body portion 41 are as follows. It corresponds to the first engagement claw portion and the second engagement claw portion in the present invention.

<Modification>
Hereinafter, modifications of the embodiment will be described. In FIG. 4, the plurality of engaged claws 33 are provided in the circumferential direction of the outer peripheral surface of the lens barrel side cylindrical portion 31, but the arrangement interval, the number of arrangement, and the like can be appropriately changed. In addition, a single engaged claw 33 may be provided on the outer peripheral surface of the barrel side cylindrical portion 31. Whether the engaged claws 33 are provided singly or in plural numbers, the engaged claws 33 are continuously arranged in parallel along the entire circumference of the lens barrel side inner peripheral surface 41 d of the cylinder main body portion 41. Because the engaging claws 43 are engaged, the rotation of the lens barrel 3 in the screwing release direction is restricted.

Further, contrary to the present embodiment, a plurality of engaged claws 33 are provided continuously over the entire circumference in the circumferential direction of the outer peripheral surface of the lens barrel side cylindrical portion 31, and the inner peripheral surface of the lens barrel side of the cylinder main portion 41 The number of engaging claws 43 may be one or less than the number of the engaging claws 33 in 41 d. However, in many cases, the lens barrel side cylindrical portion 31 of the lens barrel 3 is made of metal, while the lens loosening prevention member 4 is made of resin. It is easy to carry out integral molding. Therefore, the case where the engagement claw 33 is provided over the entire circumference of the outer peripheral surface of the barrel side cylindrical portion 31 and the case where the engagement claw 43 is provided over the entire circumference of the barrel side inner peripheral surface 41 d of the cylinder main portion 41 are described. In comparison, the latter is advantageous in terms of ease of processing, manufacturing cost, and the like.

Moreover, in FIG. 2 and 3, although the single locking groove 23 and the locking plate 42 are provided in the body main body side cylinder part 21 and the cylinder main body part 41 respectively, the locking groove 23 and the locking plate 42 It can be provided at multiple locations in the circumferential direction. For example, when the relative rotation of the main body 2 and the lens barrel 3 in the circumferential direction when the locking plate 42 is fitted in the locking groove 23 can be reliably restricted, the number of installation, the installation interval, etc. good.

Further, the locking groove 23 and the locking plate 42 formed on the outer peripheral surface of the body main body side cylindrical portion 21 and the inner peripheral surface of the cylinder main body portion 41 may be interchanged. This is because relative rotation in the circumferential direction of the body 2 and the lens barrel 3 can be restricted. In this case, instead of recessing the locking groove 23 in the main body side cylindrical portion 21, the locking plate 42 is convexly provided, and the locking plate 42 is convex on the body main body side inner circumferential surface 41c of the cylinder main portion 41. Instead of setting, the locking groove 23 is recessed. The combination of the shapes of the locking groove 23 and the locking plate 42 may be other than the combination of the long groove shape and the long plate shape as long as the shapes are complementary to each other.

Further, in the present embodiment, the main body side cylindrical portion 21 of the main body 2 is made to correspond to the first cylindrical body in the present invention, and the barrel side cylindrical portion 31 of the lens barrel 3 is made the second cylindrical body in the present invention. Although corresponding, it is also possible to reverse the correspondence between both. In that case, as the first locking portion instead of the engaged claw 33 on the outer peripheral surface of the barrel side cylindrical portion 31 (specifically, the portion where the engaged claw 33 is provided in FIG. 2) The locking groove is recessed (or the locking plate is protruded). On the other hand, on the open end side of the outer peripheral surface of the body main body side cylindrical portion 21, that is, in the portion where the locking groove 23 is provided in FIG. The engagement claw 33 is provided.

Incidentally, when the locking groove is recessed on the outer peripheral surface of the lens barrel side cylindrical portion 31, the lens barrel side inner peripheral surface 41d of the lens loosening prevention member 4 is formed complementarily to the locking groove. The locking plate may be provided in a convex manner. Conversely, when the locking plate is provided on the outer peripheral surface of the barrel side cylindrical portion 31 in a convex manner, the lens barrel side inner peripheral surface 41 d of the lens loosening prevention member 4 is formed complementarily to the locking plate. It is preferable that the locking groove be recessed.

Further, in the present embodiment, the cylinder main body portion 41 has a cylindrical shape, but in the state in which the body main body side cylindrical portion 21 and the lens barrel side cylindrical portion 31 are screwed together, the locking groove 23 and the engaged claw 33 Other shapes can be adopted as long as they cover the cylinder. For example, the cylinder main body 41 may be a cylinder having a so-called C-shaped cross section in which a slit is formed from one end edge to the other end edge. Further, as the outer surface shape, a shape other than a circle, for example, a polygon may be adopted, and an appropriate shape can be adopted without departing from the scope of the present invention.

Further, in the present embodiment, the lens loosening prevention member 4 is made of resin, but the material of the lens loosening prevention member 4 is not limited to this. For example, the lens loosening prevention member 4 may be formed of a combination of metal and resin. More specifically, the portion other than the cutting guide portion 44 in the cylinder main body portion 41 may be made of a highly elastic metal such as a spring material, and the engaging claw 43 and the cutting guide portion 44 may be formed of resin. Further, the entire lens loosening prevention member 4 may be made of metal. In this case, it is also possible to form the lens loosening prevention member 4 by forming the engaging claws 43 in a metal flat plate by pressing and then forming the engaging claws 43 in a cylindrical shape.

Example 2
FIG. 5 is an exploded perspective view of a camera unit including the lens loosening prevention member and the camera in the present embodiment. Specifically, FIG. 6 is a perspective view from the diagonally back side of the body main body 2 of the camera 1, and the same components as those according to the first embodiment are given the same reference numerals.

In the present embodiment, the arrangement pattern of 33 provided on the outer peripheral surface of the barrel side cylindrical portion 31 in the lens barrel 3 is different from that of the first embodiment. Specifically, several (here, three examples are illustrated) engaging claws 33 arranged in a row continuously in the circumferential direction of the outer peripheral surface of the barrel side cylindrical portion 31 is made into a group (hereinafter referred to The engaging claw group 330 ′ ′) and the engaged claw group 330 are similarly provided along the circumferential direction at predetermined intervals (here, an example of about every 90 ° is shown). As described above, by sequentially arranging the plurality of engaged claws 33 for each engaged claw group 330, the reliability regarding preventing the lens barrel 3 from loosening during normal use of the camera 1 is improved. It will increase further. For example, even if one of the engaged claws 33 is broken due to contact by the engaging claws 43, the remaining engaged claws 33 of the engaged claw group 330 are locked by the engaging claws 43 engaged therewith. Therefore, it is possible to more reliably prevent the barrel side cylindrical portion 31 from rotating in the screwing release direction.

Next, the cutting guide portion 44 in the present embodiment will be described with reference to FIGS. 5 and 6. FIG. 6 is a perspective view of a state in which the lens loosening prevention member 4 in the present embodiment is attached to the camera 1. As shown in FIGS. 5 and 6, on a part of the peripheral surface of the cylinder main body 41 in the lens loosening prevention member 4, a U-shaped cutaway portion 45 is provided. The length in the width direction (hereinafter referred to as "width dimension") Wsz in the axial direction is smaller than that in the other portions. Here, a portion of the end edge 41a on the body main body side, in which the notch 45 is provided, is referred to as a "notch forming portion edge 41e".

Also in the present embodiment, the thin-walled portion 44 a is provided on the outer peripheral surface of the cylinder main body 41 as the cutting guide portion 44 which is easier to cut than the other portions. This embodiment differs from the first embodiment in that it is provided. In FIG. 6, a thin portion 44 a in which two grooves parallel to the axial direction are formed from both ends of the notch forming portion edge 41 e toward the lens barrel side edge 41 b corresponds to the outer peripheral surface of the cylinder main portion 41. It is provided. When the portion sandwiched between the two adjacent thin portions 44a is referred to as "intermediate thick portion 46", the end edge of the intermediate thick portion 46 opposite to the notch portion 45 is the above-mentioned notch forming portion It corresponds to the edge 41e. In the present embodiment, a flange piece 47 protruding toward the notch 45 is extended from the edge 41e of the notch forming portion.

When the lens barrel 3 fixed to the body 2 is once removed, as in the case of lens replacement, the flange piece 47 is pulled in the out-of-plane direction of the tube body 41. When the above-described out-of-plane direction force acts on the flange piece 47, the thin-walled thin portion 44a is separated from the other thick-walled portion, and the lens loosening prevention member 4 is cut along the thin-walled portion 44a. Be done. The flange piece 47 is a force acting to separate the thin portion 44a from the other portions, and corresponds to the knob portion in the present invention.

The thickness of the thin-walled portion 44a in the present embodiment may be set to a thickness such that the thin-walled portion 44a can be separated without difficulty by pulling the flange piece 47 with an appropriate force in a hand-clamped state. Further, with regard to the specific thickness, an optimum value can be obtained in advance based on a rule of thumb. By adopting this configuration, since it is not necessary to use an instrument such as a cutter when cutting the lens loosening prevention member 4, the workability regarding lens replacement is improved.

Next, the width dimension Wsz of the cylinder main body 41 in the lens loosening prevention member 4 in the present embodiment will be described. In the state shown in FIG. 6, the screwing amount Qs of the main body side cylindrical portion 21 and the lens barrel side cylindrical portion 31 is the screwing amount when the screw portions 22 and 32 are finally meshed with each other (hereinafter referred to as “ This condition is referred to as "the full screwing condition". In FIG. 6, an appropriate gap is secured between the body body 2 and the body body side edge 41a and between the lens barrel 3 and the barrel side edge 41b. That is, in this figure, the body body side end edge 41a abuts on the body body 2 until the screwed state of the body body side cylindrical portion 21 and the lens barrel side cylindrical portion 31 reaches the completely screwed state, or the lens barrel The width dimension Wsz of the tube main body 41 is adjusted so that the side edge 41 b does not abut on the lens barrel 3. As a result, the lens barrel 3 is fixed (mounted) to the body 2 without the tube body 41 of the lens loosening prevention member 4 interfering with either the body 2 or the lens barrel 3.

Next, a modification of the setting of the width dimension Wsz of the cylinder main body 41 will be described. In this modification, before the screwing state of the body main body side cylindrical portion 21 and the lens barrel side cylindrical portion 31 reaches the above-mentioned full screwing state, that is, the screwing amount Qs is smaller than the maximum screwing amount. At the time when the combined amount Qst is reached, the barrel side edge 41b is in contact with the facing surface 34 (see FIG. 5) of the lens barrel 3 facing the barrel side edge 41b. Set the width dimension Wsz.

When the lens barrel 3 is fixed to the main body 2 of the lens barrel 3, an opposing surface 34 is formed at a position opposed to the barrel side edge 41 b of the barrel body 41. The distance (gap) between the lens barrel side edge 41b and the lens barrel side edge 41b decreases with the increase of the screwing amount Qs. Therefore, in the present modification, when the screwing amount Qs reaches the specified screwing amount Qst, the distance between the barrel side end edge 41b of the barrel body 41 and the opposing surface 34 of the lens barrel 3 becomes zero. The width dimension Wsz is set to (in order to eliminate the gap). Then, when the screwing amount Qs reaches the specified screwing amount Qst, the lens barrel side end edge 41b abuts (collides) with the facing surface 34 of the lens barrel 3, and therefore, the screwing further progresses. I can not do it.

Here, when the screwing amount Qs changes, the lens focal position changes. Therefore, in the present modification, the prescribed screwing amount Qst is set in accordance with the lens focus position. Thus, the lens focal position can be reliably adjusted to the required value.

As a more preferable embodiment, when a plurality of lens focal positions are set, it is preferable to prepare a plurality of types of lens looseness prevention members 4 having different width dimensions Wsz of the cylinder main body 41 for each corresponding prescribed screwing amount Qst. . Then, when changing the lens focal position, the lens focal position can be easily adjusted to a desired position only by reattaching the lens loosening prevention member 4 of the width dimension Wsz corresponding to the lens focal position to the camera 1 . According to this, it is not necessary to prepare a large number of spacer rings or the like for each desired lens focal position, and the lens focal position can be changed easily and at low cost.

In this modification, the lens barrel side end edge 41b is in contact with the lens barrel 3 when the screwing amount Qs reaches the prescribed screwing amount Qst, but at that time, the body main body side edge The width dimension Wsz of the cylinder main body 41 may be set such that 41a abuts on the body 2. As an embodiment in that case, as in the modification described in the first embodiment, it is preferable to apply to the case where the engagement claws are formed on the outer peripheral surface of the body main body side cylindrical portion 21. In addition, various modifications can be added to the embodiment of the present invention without departing from the spirit of the present invention. Further, the configurations described in the respective embodiments can be combined as much as possible.

Reference Signs List 1 camera 2 body main body 3 lens barrel 4 lens loosening prevention member 21 body main body side cylindrical portion 22 screw portion 23 locking groove 31 barrel side cylindrical portion 32 screw portion 33 engaged claw 41 cylinder main body portion 41 a body main body side end Edge 41b Lens barrel side edge 41c Body body side inner circumferential surface 41d Lens barrel side inner circumferential surface 42 Locking plate 43 Engaging claw 44 Cutting guide portion 44a Thin portion 46 Intermediate thick portion 47 Flange piece (thumb portion)

Claims (10)

1. Screwing the threaded portion of the first cylindrical body of either one of the camera body and the lens barrel with the threaded portion of the second cylindrical body of the other to connect the body and the lens barrel; The present invention is applied to a camera in which a first engaging portion is recessed or protruded on the outer peripheral surface of the first cylindrical body and a first engaging claw is provided on the outer peripheral surface of the second cylindrical body. A lens loosening prevention member,
   A cylinder main body portion which is a cylindrical body covering the first locking portion and the first engagement claw portion in a state in which the first and second cylindrical bodies are screwed together;
   It has a shape complementary to the first locking portion, and is provided on the inner peripheral surface at one end edge of the cylinder main body so as to be fitted to the first locking portion in the optical axis direction. A second locking portion,
   It is provided on the inner peripheral surface on the other end edge side of the cylinder main body portion so as to engage with the first engaging claw portion, and the second locking portion is fitted to the first locking portion A second engagement claw portion that restricts rotation of the first engagement claw portion only in a direction in which the first and second cylindrical members are unscrewed in the closed state;
   A lens loosening prevention member characterized by comprising:
2. The first engagement claw portion is inclined in the circumferential direction relative to the first radial surface extending in the radial direction from the outer peripheral surface of the second cylindrical body and the first radial surface. It is formed in the shape of a substantially right triangle by the extended first inclined surface,
   The second engagement claw portion is radially extended from the inner peripheral surface of the cylinder main body portion and a second radial surface facing the first radial surface, and the second diameter. It is formed in a substantially right-angled triangular shape by being inclined and extended in the circumferential direction compared with the direction surface, and by the second inclined surface opposed to the first inclined surface,
   When the first engaging claw rotates in a direction in which the first and second cylinders are screwed, the first and second inclined surfaces abut each other, and the first and second cylinders The lens loosening prevention member according to claim 1, wherein the first and second radial surfaces abut each other when the first engaging claw portion rotates in a direction to release the screwing.
3. The lens loosening prevention member according to claim 1 or 2, wherein the second engagement claw portion is continuously and continuously arranged in the circumferential direction over substantially the entire circumference of the inner peripheral surface of the cylinder main body portion. .
4. The lens loosening prevention member according to any one of claims 1 to 3, which is made of a resin.
5. The cutting guide part which is easy to cut | disconnect from the other part is provided from the one end edge to the other end edge in the said cylinder main-body part, It is characterized by the above-mentioned. Lens loosening prevention member.
6. The lens loosening prevention member according to claim 5, wherein the cutting guide portion is a thin-walled portion in which the thickness of the cylinder main body portion is smaller than that of the other portion.
7. The lens according to claim 5 or 6, wherein a knob for applying a force for separating the cutting guide from the other portion is provided around the cutting guide in the cylinder main body. Loosening prevention member.
8. The cylinder main body portion is provided with a plurality of the cutting guide portions, and the knob portion is a flange piece extended from an end edge portion of a portion sandwiched by two adjacent cutting guide portions. The lens slack prevention member according to claim 7, characterized in that:
9. When the screwing amount of the first and second cylindrical members reaches a predetermined screwing amount set in advance, the width dimension of the cylindrical main body in the axial direction of the cylindrical main body portion is fixed to the camera body or lens barrel. The edge portion of the main body is adjusted to abut, and the defined screwing amount is set in accordance with an arbitrary lens focal position, according to any one of claims 1 to 8. The lens slack prevention member as described.
10. A camera unit comprising: the lens slack prevention member according to any one of claims 1 to 9; and a body main body and a lens barrel in a camera to which the lens slack prevention member is applied.

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