JP2534623Y2 - Mount position conversion mechanism of lens barrel for optical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a mechanism for changing the mount position of a lens barrel for an optical device.

2. Description of the Related Art In a lens barrel for an optical device having a screw mount, a wiring cord or the like for transmitting information from the lens barrel side to the main body side or controlling the lens barrel side from the main body side. In this positional relationship, it is necessary to change the mount mounting position according to the equipment used, and it is a necessary condition to configure the mount position conversion function on the lens barrel side.

Under such circumstances, the conventional mount position conversion mechanism includes a fixed body having a mount screw for fixing to the camera body,
The connecting ring on the movable body side holding the optical system is rotatably connected to the fixed body via a friction spring against the frictional resistance of the friction spring. A rotation stopper for restricting rotation is provided.Furthermore, after the fixed body is fixed by the mounting screw, the connecting ring is rotated against the friction spring, so that the loosening torque of the mounting screw is reduced by the frictional resistance torque of the friction spring. When the fixed body is fixed to the optical device main body, the fixed body is attached to the camera body with the connecting ring abutting against the rotation stopper in the screwing direction of the mounting screw and rotating integrally with the fixed body. Screw it in and fix it.Then, rotate the joint ring in the opposite direction against the frictional resistance of the friction spring integrally with the moving body side to perform the alignment, and Setting is completed, the movable body side were those fixed by the frictional resistance of the friction spring.

Also, when removing the fixed body from the optical device body,
When the movable body is rotated in the direction to loosen the mount screw against the friction spring, the connecting ring attached to the movable body is rotated in the direction in which the friction spring torque that is weaker than the screw loosening torque is set, and the rotation in the opposite direction is performed. The mechanism is such that the fixed body having the mounting screw is rotated integrally with the moving stopper until it comes into contact with the moving stopper, the mounting screw is loosened, and the fixed body can be removed from the main body.

That is, conventionally, a mount position conversion mechanism using sliding friction by a friction spring having a rotation stopper has been often used.

Problems of conventional technology By the way, recently, it is required that the lens barrel for optical equipment be supplied to the market at a low price in addition to being small and light,
Under such circumstances, it is very difficult to supply products required by the market unless resinization is considered.

When considering the use of resin as a component of a product, there are two problems with the conventional mount position conversion mechanism.

The first problem is in securing the strength of the rotation stopper when attempting to reduce the size of the component in resin.

That is, the rotational torque when mounting and removing the mount is 10 kg-cm to 2
Since a torque of 0 kg-cm is a conceivable torque, the rotation stopper is required to have a stopper strength that can withstand a pressure torque of 20 kg-cm to 30 kg-cm. In the case of a stopper member made of metal, it is not a problem to have such strength, but in the case of a stopper component member made of a resin part,
The surface area of the attachment portion must be several times larger than that of metal, or the volume of the contact member is required.

In addition, increasing the number of locations where the stopper portion is installed in order to increase the contact area of the stopper portion leads to an increase in the position non-adjustable region at the time of position conversion, and there is a problem in that the original function of mount position conversion is required.

The second problem is a problem of operability when attaching / detaching to / from the optical device body.

The mounting position conversion mechanism does not work unless the torque of the friction spring is always less than the loosening torque of the mounting screw.Therefore, when mounting, generally, the fixed body is optically held by holding the lens barrel on the moving body side. When the screw is inserted into the device body, the friction spring torque is lost before the mounting screw is completely tightened, and the mounting screw rotates in an idling state until it hits the rotation stopper, and hits the stopper. Only after that, the fixed body having the mounting screw is turned integrally and the complete screw tightening is performed.

Next, after removing the lens barrel from the optical device main body after rotating the movable body side for positioning of the mount, if the movable body side is rotated in the direction in which the mounting screw is loosened, the mounting Before the screw is loosened, it is slid and rotated by the friction spring part, idles against the mounting screw part until it hits the rotation stopper, and when it hits the rotation stopper, the fixed body with the mounting screw is loosened in the direction to loosen the mounting screw Rotate to remove the lens barrel from the optical device body.

In this series of attachment / detachment operations, the connecting ring on the moving body side must be idled with respect to the mount screw until it comes into contact with the rotation stopper both when attaching and detaching. In addition, the idling operation amount is a wasteful operation close to about one rotation at the maximum, which is also a troublesome operation that occurs during both the attaching and detaching operations, and takes a long time to attach and detach.

In addition, as another conventional technique, a mechanism is also used in which a fixed body having a mount screw and a joining ring holding a moving body are positioned for conversion of a mount position and then fixed with set screws or the like. However, in this case, it is necessary for the user to fix the screws after positioning, which is not a desirable structure when standing on the user side, and because it is a strong surface to fix with the set screw. Therefore, there is a problem that the use of resin parts becomes impossible.

Means for Solving the Problems The present invention has been made in view of these problems, and a fixed lens barrel fixed to a main body of an optical device by a mounting screw,
A moving body having an optical system movably provided in the optical axis direction with respect to the fixed lens barrel; rotating with respect to the fixed lens barrel and freely moving in the optical axis direction while rotating with respect to the moving body; A connecting ring movably provided along the optical axis without moving, and an operating ring interposed between the connecting ring and the moving body to move the moving body in the optical axis direction with respect to the fixed lens barrel to perform a focusing operation. An optical member, which is provided between the fixed lens barrel and the movable body and resiliently resiliently elastically contacts the fixed lens barrel in the direction of the optical axis via the operating ring and the connecting ring. In a lens barrel for an optical device having a mechanism for moving along an axis, a contact surface that is in close contact with each other due to the resilient force of the elastic member is provided between the fixed barrel and the joining ring, and the contact surface While providing a plurality of concave portions and convex portions that simultaneously engage with each other and regulate rotation, the moving body and the joining ring And an engagement release means for moving the joining ring forward along the optical axis direction against the elastic force of the elastic member to release the engagement between the concave portion and the convex portion. It is an object of the present invention to provide a mount position conversion mechanism for a lens barrel for an optical device.

When the lens barrel having the configuration of the above embodiment is mounted on an optical device, first, a mounting screw is screwed into a mount portion of the optical device main body, and when a moving body is screwed in, a fixed lens barrel and a connecting ring are formed. Are integrally engaged at the concave and convex portions, and the mounting screw of the fixed lens barrel can be completely tightened.

Next, in order to convert the mount position change, the movable body is similarly rotated. However, the fixed lens barrel and the concave and convex portions of the connecting ring are engaged and cannot be rotated as they are. When the moving body is pulled forward along the optical axis direction against the force, the engagement releasing means works, the engagement between the concave portion and the convex portion is released, and the moving body can be rotated. When the rotation operation is stopped at the place where the necessary mount position is set and the force for pulling the movable body side forward is released, the mount position is fixed by the elastic force of the elastic member.

Next, in the case of removing the lens barrel from the optical device body, if the user similarly holds the moving body and turns in the direction in which the mount screw is loosened, the plurality of concave portions and convex portions are integrally engaged with a slight rotation. As a result, the idling operation due to the friction caused by the elastic force of the elastic member is slight, the fixed lens barrel having the mount screw can be removed from the optical device body, and the convex portions and the convex portions are simultaneously contacted at a plurality of locations. Because of the contact area, considering the contact area per unit at least as a whole, it secures a total area that can withstand a torque of 20 to 30 kg-cm of rotational torque, enables plastic molding of component parts, and is small and lightweight. It is also an object of the present invention to provide a mount position changing mechanism for a lens barrel for an optical apparatus which is highly productive in terms of accuracy and cost and in which operability is reduced as much as possible in unnecessary mounting and dismounting operations.

An embodiment in which the mechanism of the present invention is applied to a lens barrel for a CCTV camera will be described below with reference to the accompanying drawings.

In FIG. 1, a lens barrel according to the present invention is a fixed barrel 1 on a fixed body side mounted on a camera body by a mounting screw 1a, and moves in the optical axis direction and the rotation direction with respect to the fixed barrel 1. There is a connecting ring 2 on the fixed body side freely mounted, a lens barrel 3 as a moving body supported by the connecting ring 2 so as to be able to move straight along the optical axis direction, and between the connecting ring 2 and the lens barrel 3. An operating ring 4 for rotating and moving the lens barrel 3 holding the optical system in a straight line to perform a focusing operation, and operating the lens barrel 3 with respect to the fixed lens barrel 1 between the fixed lens barrel 1 and the lens barrel 3. An elastic member 9 resilient in a direction of elastically contacting the optical axis via the ring 4 and the connecting ring 2;
In addition, a decorative frame 5 that integrally covers the outer periphery of the lens barrel 3 on the moving body side
And a front group lens frame 6 and a rear group lens frame 7 provided to hold the front group lens 11 and the rear group lens 12 in the lens barrel 3, a holding ring 8 described later, a straight guide screw 10, and the like. ing.

In the case of the embodiment, the fixed ring 1 in the mount position changing mechanism of the lens barrel for an optical device according to the present invention has a connecting ring 2.
On the contact surface in the thrust direction along the optical axis with, a plurality of protrusions 1f are protruded at equal intervals, while the connecting ring 2 has the same number or a multiple ratio of fitting with the protrusions 1f. A recess 2f is provided.
Both sides of the concave portion 2f constitute a rotation stopper 2e which simultaneously engages with the convex portion 1f in the rotational direction.
When the convex portion 1f and the concave portion 2f of the connecting ring 2 are simultaneously fitted and rotated by a predetermined angle and the convex portion 1f abuts at the same time as the rotation stopper 2e, the two are integrated in the rotation direction. It is.

In another embodiment, the projection 1f and the recess 2f are fitted in the rotation direction in a close contact state, and the rotation stopper 2e is formed so that both sides of the recess 2f are simultaneously in contact with both sides of the projection 1f. In this case, the convex portion 1f and the concave portion 2f are fitted, and at the same time, are engaged with the rotation stoppers 2e on both sides thereof, so that the fixed barrel 1
And the connecting ring 2 may be configured to be integrated in any rotational direction.

Further, the fixed lens barrel 1 has a spigot portion 2c of the outer cylinder portion of the splicing ring 2 fitted to the spigot portion 1c of the inner cylinder portion so as to be rotatable and movable in the optical axis direction. The concave portion 2f is pulled out toward the front lens group 11, the engagement between them is released, and the concave portion 2f side can be rotated with respect to the convex portion 1f.

In the embodiment, the concavo-convex portions 1f and 2f of the contact surface are the convex portion 1f on the fixed lens barrel 1 side and the concave portion 2f on the joint ring 2 side. However, even if any surface side is concave, the opposite side is convex. The same effect can be obtained by doing things.

In addition, the connecting ring 2 includes a rectilinear guide mechanism that guides the lens barrel 3 to move straight along the optical axis. In the case of the embodiment, the connecting ring 2 has a guide hole 2d for guiding the linear guide screw 10 implanted in the lens barrel 3 along the optical axis along the optical axis. The rectilinear guide screw 10 has a stopper 10d in the optical axis direction with respect to the guide hole 2d. When the stopper 10d hits the end face of the guide hole 2d, it acts as a stopper in the thrust direction. It is configured to be drawn out forward of the optical axis.

That is, when the lens barrel 3 is pulled forward in the optical axis direction, the connecting ring 2 is pulled out by the straight guide screw 10 and provided on the contact surface of the fixed lens barrel 1 and the connecting ring 2 in the thrust direction. It serves as a means for releasing the engagement between the concave and convex portions where the engagement of the concave and convex portions 1f and 2f is released.

In the above-described embodiment, the thrust direction stopper 10d is provided on the rectilinear guide screw 10 as the rectilinear guide mechanism, and is configured as a means for disengaging the uneven portion. Are connected by a linear guide mechanism composed of a key and a key groove, and a stopper provided at an end of the key comes into contact with an end face of the key groove, thereby moving the connecting ring 2 integrally with the lens barrel 3, When the lens barrel 3 is moved at a predetermined interval in the optical axis direction, the connecting ring 2 is displaced in the optical axis direction so that the engagement between the portions 1f and 2f can be released and the engagement between the concave portion and the convex portion can be performed. The configuration is not limited to the embodiment as long as it is a unit that moves and releases the engagement of the uneven portion.

A holding ring 8 having a flange-like holding portion is provided in the lens barrel 3 inside the mount screw 1a of the fixed lens barrel 1.
An elastic member 9 made of a leaf spring or the like, which is elastically deformed in the compression direction to exert a resilient force in the optical axis direction between the press ring 8 and the fixed lens barrel 1 opposed thereto. Not only gives an elastic contact force to the contact surface between the lens barrel 3 and the operation ring 4 by its resilient force, but also provides a joint between the lens barrel 3 and the fixed lens barrel 1. The elastic member 9 is also provided with a resilient force on the contact surface between the ring 2 and the fixed lens barrel 1 in the thrust direction, so that the uneven portions 1f and 2f are elastically adhered to each other.

The elastic force of the elastic member 9 depends on the contact surface between the fixed lens barrel 1 holding the elastic member 9 and the holding ring 8 and the fixed lens barrel 1 and the connecting ring 2.
The contact surfaces 1f and 2f of the lens barrel 1 have a function as a friction spring for imparting frictional resistance, and also have a function of fixing the fixed barrel 1 at the mounting position of the lens barrel 2.

Further, a front group lens frame 6 and a rear group lens frame 7 are integrally fixed to the lens barrel 3 so as to hold an optical system including a front group lens 11 and a rear group lens 12. , Is fitted to the inner cylindrical portion of the connecting ring 2 so as to be movable in the optical axis direction.

In the illustrated embodiment, the connecting ring 2 rotatably supports the operating ring 4 on the outer cylinder side.

Here, in the case of the embodiment, the end face in the thrust direction of the operation ring 4 rotatably provided on the connecting ring 2 is in contact with the end face of the lens barrel 3 opposed thereto. An operation surface 13 formed of a slope or a cam surface having a lead angle that increases and decreases in accordance with a predetermined rotation angle is provided, and a contact portion 14 formed of a round head projection or the like abutting on the operation surface 13 is provided on the other end surface.
The elastic member 9 constantly applies an elastic adhesive force to the contact surfaces 13 and 14 so that the lens barrel 3 advances and retreats along the optical axis by rotating the operation ring 4. .

When mounting the lens barrel having the configuration of the above-described embodiment on an optical device, first, the mounting screw 1a is screwed into the mount portion of the optical device main body, and then screwed in. When the operation unit is provided in the unit 1, the operation unit can be tightened with the fixed lens barrel 1. It will be screwed. In this case, when the fixed lens barrel 1 is engaged and abutted by the concave and convex portions 1f and 2f of the contact surface between the fixed lens barrel 1 and the connecting ring 2, the mount screw of the fixed lens barrel 1 can be completely tightened.

Next, in order to convert the mount position conversion, the decoration frame 5
However, if it is desired to rotate the mounting screw in the tightening direction, the convex portion 1f of the contact surface is in contact with the rotation stopper 2e and the stopper is engaged, so that the rotation cannot be performed as it is. However, when the decorative frame 5 is pulled forward along the optical axis direction (that is, in the direction of the front lens group 11), when the decorative frame 5 is pulled by a force that overcomes the repulsive force of the elastic member 9, the lens barrel 3 is pulled out, and further straightly guided. The stopper 10d in the thrust direction of the screw 10 comes into contact with the end face of the guide hole 2d of the connecting ring 2 and pulls the connecting ring 2 forward, and the convex portion of the contact surface between the fixed lens barrel 1 and the connecting ring 2 When the engagement between the rotation stopper 1e and the rotation stopper 2e is released and the decoration frame 5 is rotated, the decoration frame 5 can be jumped over the contact stopper portion of the uneven portion and can be rotated to the next stopper contact portion, and the necessary mounting Rotation operation where the position is set When stopped, it will be fixed by the elastic force of the elastic member 9. Further, even when the rotation direction of the mount position conversion is reversed, the decorative frame 5 is similarly pulled forward at the place where it comes into contact with the stopper, and the stopper is jumped over, so that the necessary mount position can be set in the same procedure. .

Next, in the case of removing the lens barrel from the optical device main body, similarly, when the decoration frame 5 is rotated in the direction in which the mounting screw is loosened, as in the embodiment shown in FIG. Even if it is located, the convex portion 1f and the stopper 1e come into contact with a slight rotation, so that the idling operation due to friction due to the elastic force of the elastic member 9 can be reduced, and the uneven portions 1f and 2f are rotated in the rotational direction. In the case of close fitting, the fixed lens barrel 1 having the mounting screw can be removed from the optical device body by rotating immediately, and the convex part 1f and the stopper part 1e are simultaneously contacted at a plurality of places. Since the stoppers are in contact with each other, the contact area of each stopper is at least large in the overall area, and sufficient strength can be secured.

As described above, according to the mount conversion mechanism for the lens barrel for an optical device according to the present invention, the fixed lens barrel fixed to the optical device body by the mount screw, and movable in the optical axis direction with respect to the fixed lens barrel. A moving body including the optical system provided in
A splicing ring which is freely rotatable along the optical axis without rotating with respect to the moving body while rotating freely with respect to the fixed lens barrel and moving between the splicing ring and the moving body; An operating ring for moving the moving body in the optical axis direction with respect to the fixed lens barrel to perform focusing operation, and an operating ring for connecting the moving body to the fixed lens barrel between the fixed lens barrel and the moving body. An optical device lens barrel having a mechanism for moving an optical system including an elastic member resiliently resilient in a direction of elastically contacting the optical axis through a ring along the optical axis. A contact surface that is in close contact with each other by a resilient force is provided between the fixed lens barrel and the connecting ring, and the contact surface is provided with a plurality of concave portions and convex portions that simultaneously engage with each other and regulate rotation, and Move the joint ring forward between the body and the joint along the optical axis direction against the elastic force of the elastic member Therefore, there is provided a structure in which engagement releasing means for releasing the engagement between the concave portion and the convex portion is provided. Therefore, the concave portion and the convex portion simultaneously engaged with each other have a large overall area even if the contact area of each one is small. Even if the size is reduced or the resin parts are used, the strength can be reliably ensured, and the number of the concave and convex portions can be freely selected and set, so that there is a degree of freedom in the strength design, while the plural stoppers are provided. By installation, the idling operation angle due to friction at the time of attachment / detachment operation is reduced, there is an effect that is excellent in operability, and by forming resin for the uneven part, it is possible to select a free shape, and a component configuration with high productivity Thus, there is an effect of providing a mount position changing mechanism of a lens barrel for an optical apparatus, which is a mechanism which is easy to cope with reduction in size and weight which is excellent in terms of performance, operability, and cost.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a main part of an embodiment of a lens barrel for a CCTV camera to which the present invention is applied, and FIG. 2 is a front view of the main part. Reference Signs List 1 fixed lens barrel 1f convex part 2 joint ring 2f concave part 2e rotation stopper 3 lens barrel 4 operation ring 5 decorative frame 6 front lens frame 7 Rear group lens frame 8 ... Holding ring 9 ... Elastic member 10 ... Straight guide screw 11 ... Front group lens group 12 ... Rear group lens group 13 ... Operation surface (slope surface or cam surface) 14 ... Abutment Department

Claims (4)

(57) [Scope of request for utility model registration] A movable body having a fixed lens barrel fixed to a main body of an optical device by a mounting screw, an optical system movably provided in an optical axis direction with respect to the fixed lens barrel, and A connecting ring that is freely rotatable and movable in the optical axis direction while being movable along the optical axis without rotating with respect to the moving body, and a fixed mirror interposed between the connecting ring and the moving body. An operating ring for moving the moving body in the optical axis direction with respect to the barrel and performing a focusing operation; and an operating ring provided between the fixed lens barrel and the moving body to move the moving body with respect to the fixed lens barrel via the operating ring and the connecting ring. A lens barrel for an optical device having a mechanism for moving an optical system comprising an elastic member resiliently resilient in a direction along the optical axis along the optical axis. Contact surfaces are provided between the fixed lens barrel and the connecting ring, and the contact surfaces are simultaneously engaged with each other. While providing a plurality of concave portions and convex portions for regulating rotation, between the moving body and the connecting ring, the connecting ring is moved forward along the optical axis direction against the elastic force of the elastic member. An engagement releasing means for releasing the engagement between the concave portion and the convex portion. 2. The mounting position conversion mechanism according to claim 1, wherein said engagement release means for disengaging said concave and convex portions does not rotate said connecting ring with respect to a moving body. A mount position changing mechanism for a lens barrel for an optical device, comprising a linear guide mechanism movably provided along an axis. 3. Claims for utility model registration (1) or (2)
3. The lens for an optical device according to claim 1, wherein the concave portion and the convex portion are rotatably fitted to each other, and the convex portions are simultaneously in contact with rotation stoppers on both sides thereof. Lens barrel mount position conversion mechanism. (4) Claims of utility model registration (1) or (2)
5. The lens barrel for an optical device according to claim 1, wherein the concave portion and the convex portion are configured to be fitted in a state of being in close contact with the rotation stoppers on both sides thereof without rotating each other. Mount position conversion mechanism.