JP2010072251A - Lens barrel and imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operational stability in a low temperature environment, water tightness stability in a high temperature environment, and ease of assembly with a low cost and simple configuration.
A first seal member 31 that seals between a fixed frame 41 and a first rotating cylinder 42 is composed of a member having elasticity and magnetic force, and includes a first cylindrical member 21 and a second cylindrical member. 22 is comprised with the member which has magnetism. The first cylindrical member 21 is integrally attached to the outer peripheral portion in the vicinity of the end portion of the fixed frame 41, the end portion is protruded, the tip is bent inward, and the end of the bent portion and the fixed frame 41 is bent. A fixed portion 21a having an annular groove shape opened to the inner peripheral surface side is formed between the two portions. The second cylindrical member 22 is integrally attached to the outer peripheral portion of the first rotating cylinder 42 at a portion corresponding to the fixed portion 21a. The first seal member 31 is provided such that the outer peripheral portion is fitted into the fixing portion 21 a of the first cylindrical member 21 and the inner peripheral edge portion 31 a is in contact with the outer peripheral surface 22 a of the second cylindrical member 22.
[Selection] Figure 4

Description

  The present invention relates to a lens barrel having a so-called collapsible structure, and more particularly, to a lens barrel having a waterproof structure and an imaging apparatus configured using such a lens barrel.

2. Description of the Related Art Conventionally, in an imaging apparatus such as a digital camera, the movable lens barrel is retracted inside the camera body at the time of shooting other than at the time of shooting as the performance of an imaging lens such as a zoom lens increases and the size is reduced according to user requirements. What has a type of imaging lens barrel is required. Further, in order to be usable in cold and tropical areas, it is also required to have low temperature resistance and high temperature resistance.
Furthermore, it is required to have waterproof performance so that it can be used on rivers, beaches, boats and yachts, etc. and outdoors in the rain, or even underwater or even in the sea. In response to such a requirement for waterproof performance of a camera or the like, conventionally, a waterproof exterior body for enclosing the entire camera body in a state in which the photographing lens is most extended is used.
And as a structure which waterproofs between the members which move relatively, patent document 1 (Japanese Utility Model Laid-Open No. 58-178126) proposes a seal member having a substantially V-shaped cross section on the front end side. This seal member is a seal member made of an annular elastic body having a substantially V-shaped cross section, and a portion corresponding to one end of the V shape has an inner periphery of a first cylindrical member having a hollow cylindrical shape. The portion corresponding to the other end of the V-shape is elastically deformed against the surface and elastically deformed against the second tubular member that moves relative to the first tubular member. Provided between the first cylindrical member and the second cylindrical member in a watertight manner.

Japanese Utility Model Publication No. 58-178126

However, in the sealing member made of an elastic body having a substantially V-shaped cross section disclosed in Patent Document 1, due to the characteristics and shape of the elastic body, the first cylindrical member and the second cylindrical member Depending on the movement direction and amount of relative movement, the V-shaped ends turn up and the sealing performance is impaired, or the V-shaped ends are formed with uniform and uniform thickness over the entire circumference. It may be difficult to do so, and the parts may be expensive, or the thickness may vary in the circumferential direction, and it may not be possible to secure a uniform pressure contact force, which may impair proper sealing performance and smooth operation. It was.
Further, in the sealing member made of the elastic body of Patent Document 1, when the elastic force of the elastic body changes due to a change in temperature or the like, the pressure contact force against the first cylindrical member and the second cylindrical member also changes. The operating force between the first cylindrical member and the second cylindrical member changes due to a change in the frictional force associated therewith, but when the control of the pressure contact force depends only on the elastic force of the elastic body, For example, even if smooth operating performance can be obtained in an environment such as 25 degrees Celsius, the elastic force of the elastic member is increased at low temperatures, resulting in an increase in operating resistance, which may cause problems in operation. Furthermore, since the elastic force of the elastic body is weakened at a high temperature, there is a possibility that sufficient water tightness cannot be ensured as a result of a decrease in the pressure contact force.

Moreover, due to the characteristics of the elastic member, it is not easy to perform watertight fixing by adhesion or the like, so that the manufacturing cost is increased, such as requiring a long time operation or expensive equipment. In addition, there is a possibility that the required waterproof performance over a long period of time cannot be ensured due to a problem in the bonded portion due to a change with time.
The present invention has been made in view of the above-described circumstances, and is excellent in operational stability in a low temperature environment, water tightness stability in a high temperature environment, and ease of assembly in a low cost and simple configuration. Another object of the present invention is to provide a lens barrel and an image pickup apparatus.
The object of claim 1 of the present invention is that, in particular, the shape of the sealing member is remarkably complicated, and extreme precision is not required, so that parts can be manufactured at low cost and the ease of assembly is improved. An object of the present invention is to provide a lens barrel capable of suppressing assembly equipment costs and shortening assembly work time, improving operational stability against temperature changes and preventing deterioration of watertightness. .
The object of claim 2 of the present invention is to facilitate the adjustment of the seal member in particular, improve the ease of assembly, reduce the cost of assembly equipment and shorten the assembly work time, and stabilize the operation against temperature changes. It is an object of the present invention to provide a lens barrel capable of improving the performance and preventing the deterioration of watertightness.

The object of claim 3 of the present invention is to be able to manufacture parts at low cost, in particular, with a simpler configuration, without significantly complicating the shape of the sealing member and without requiring extreme precision. The lens mirror can improve the ease of assembly, reduce the cost of the assembly equipment and shorten the assembly time, improve the operational stability against temperature changes, and prevent the deterioration of watertightness. To provide a torso.
The object of claim 4 of the present invention is to provide a sealing member with a simple configuration, to improve the ease of assembly at low cost, to reduce the cost of assembly equipment and to shorten the assembly work time. It is an object of the present invention to provide a lens barrel capable of improving the operational stability against changes and preventing the deterioration of watertightness.
The object of claim 5 of the present invention is that, in particular, the shape of the seal member can be remarkably complicated and parts can be manufactured at low cost without requiring extreme precision, and the ease of assembly is improved. Imaging using a lens barrel that can reduce assembly equipment costs and shorten assembly work time, improve operational stability against temperature changes, and prevent deterioration of watertightness as an imaging lens To provide an apparatus.

In order to achieve the above-described object, a lens barrel according to the present invention described in claim 1 is provided.
A first cylindrical member having a flange projecting radially inward and formed into a hollow cylindrical shape and using a magnetic material;
Provided at least in the vicinity of the fixed portion of the first cylindrical member so as to move relative to the first cylindrical member in the hollow portion of the first cylindrical member, and magnetically A second cylindrical member made of a material having
It has an annular shape, has elasticity, has a magnetic force at least at the outer peripheral portion and the inner peripheral portion, the outer peripheral portion is attracted to the fixed portion of the first tubular member by a magnetic attractive force, and the inner peripheral portion is the first A seal member that is in sliding contact with the outer peripheral surface of the second cylindrical member while being in pressure contact with the magnetic attractive force;
It is characterized by comprising.
A lens barrel according to a second aspect of the present invention is the lens barrel according to the first aspect,
A gap is provided between an inner peripheral wall surface of the fixed portion of the first cylindrical member and an outer peripheral wall surface of the outer peripheral portion of the seal member.

In order to achieve the object described above, the lens barrel according to the present invention described in claim 3 is provided.
A first cylindrical member having a flange projecting radially inward and formed into a hollow cylindrical shape;
Provided at least in the vicinity of the fixed portion of the first cylindrical member so as to move relative to the first cylindrical member in the hollow portion of the first cylindrical member, and magnetically A second cylindrical member made of a material having
It has an annular shape, has elasticity, has at least an inner peripheral portion with magnetic force, an outer peripheral portion is fixed to the fixed portion of the first cylindrical member, and an inner peripheral portion is an outer periphery of the second cylindrical member A seal member that is in sliding contact with the surface while being pressed by magnetic attraction;
It is characterized by comprising.
A lens barrel according to a fourth aspect of the present invention is the lens barrel according to any one of the first to third aspects,
The sealing member is configured to exhibit a magnetic force using a bonded magnet.
An imaging apparatus according to the present invention described in claim 5 is:
An imaging lens is configured using the lens barrel according to at least one of claims 1 to 4.

According to the present invention, there is provided a lens barrel and an imaging apparatus that are excellent in operation stability under a low temperature environment, water tightness stability under a high temperature environment, and ease of assembly with a low-cost and simple configuration. can do.
That is, according to the lens barrel of claim 1 of the present invention,
A first cylindrical member having a flange projecting radially inward and formed into a hollow cylindrical shape and using a magnetic material;
Provided at least in the vicinity of the fixed portion of the first cylindrical member so as to move relative to the first cylindrical member in the hollow portion of the first cylindrical member, and magnetically A second cylindrical member made of a material having
It has an annular shape, has elasticity, has a magnetic force at least at the outer peripheral portion and the inner peripheral portion, the outer peripheral portion is attracted to the fixed portion of the first tubular member by a magnetic attractive force, and the inner peripheral portion is the first A seal member that is in sliding contact with the outer peripheral surface of the second cylindrical member while being in pressure contact with the magnetic attractive force;
With the configuration comprising
The pressure contact force of the contact portion of the seal member with respect to the first tubular member and the second tubular member is represented by 3 of the elastic force of the seal member, the magnetic force of the seal member, and the contact area of the contact portion. Because it can be controlled with one parameter,
It is possible to manufacture parts at low cost without significantly complicating the shape of the seal member or requiring extreme precision, improving assembly ease, reducing assembly equipment costs, and assembly work time. It is possible to shorten the operation time, improve the operational stability against temperature changes, and prevent the deterioration of watertightness.

According to the lens barrel of claim 2 of the present invention, in the lens barrel of claim 1,
With a configuration in which a gap is provided between the inner peripheral wall surface of the fixed portion of the first tubular member and the outer peripheral wall surface of the outer peripheral portion of the seal member,
A position error between the outer peripheral portion of the seal member and the contact surface in the recess of the fixed portion can be absorbed,
In particular, the adjustment of the seal member is facilitated, the ease of assembly is improved, the cost of assembly equipment is reduced, the assembly work time is shortened, the operational stability against temperature changes is improved, and the water tightness is deteriorated. Can also be prevented.

According to the lens barrel of claim 3 of the present invention,
A first cylindrical member having a flange projecting radially inward and formed into a hollow cylindrical shape;
Provided at least in the vicinity of the fixed portion of the first cylindrical member so as to move relative to the first cylindrical member in the hollow portion of the first cylindrical member, and magnetically A second cylindrical member made of a material having
It has an annular shape, has elasticity, has at least an inner peripheral portion with magnetic force, an outer peripheral portion is fixed to the fixed portion of the first cylindrical member, and an inner peripheral portion is an outer periphery of the second cylindrical member A seal member that is in sliding contact with the surface while being pressed by magnetic attraction;
With the configuration comprising
The pressure contact force of the contact portion of the seal member with respect to the second tubular member can be controlled by three parameters: an elastic force of the seal member, a magnetic force of the seal member, and a contact area of the contact portion. Because you can
In particular, a simpler structure is sufficient, the shape of the seal member is remarkably complicated, and extreme precision is not required, and parts can be manufactured at low cost, improving the ease of assembly, It is possible to reduce the cost of the assembly equipment and shorten the assembly work time, improve the operational stability against temperature changes, and prevent the deterioration of watertightness.

According to the lens barrel of claim 4 of the present invention, in the lens barrel of any one of claims 1 to 3,
By configuring the sealing member to exhibit a magnetic force using a bonded magnet,
In particular, the seal member is configured with a simple structure, and at low cost, the ease of assembly is improved, the cost of assembly equipment can be suppressed and the assembly work time can be shortened, the operational stability against temperature change is improved, and the watertightness is improved. It is possible to prevent deterioration of the property.
Furthermore, according to the imaging device of claim 5 of the present invention,
By configuring the imaging lens using the lens barrel of at least one of claims 1 to 4,
In particular, it is possible to manufacture parts at low cost without significantly complicating the shape of the seal member or requiring extreme precision, improving ease of assembly, reducing assembly equipment costs, and assembling. The working time can be shortened, the operational stability against temperature change can be improved, and the deterioration of water tightness can be prevented.

Hereinafter, based on an embodiment of the present invention, a lens barrel and an imaging device of the present invention will be described in detail with reference to the drawings.
FIGS. 1-11 has shown the structure of the principal part of the imaging optical system unit of the camera which is an imaging device incorporating the lens barrel which concerns on the 1st Embodiment of this invention, and various operation states.
FIG. 1 is a perspective view of the configuration of the lens barrel portion in the retracted storage state in which the lens group is retracted and stored, and FIG. 2 is a telephoto view (long focal length) where the lens group is extended to the maximum extent. FIG. 3 is a longitudinal sectional view showing the main parts of each lens group, lens holding frame and various lens barrels in the retracted and retracted lens barrel in which the lens group is retracted and stored. FIG. FIG. 4 is a longitudinal sectional view showing the main parts of each lens group, lens holding frame and various lens barrels in a lens barrel in a wide-angle (short focal length) state that is projected by a predetermined amount, and FIG. 4 is a view in the telephoto state of FIG. 5 is an enlarged view around the first seal member according to the present invention, FIG. 5 is an enlarged view around the second seal member according to the present invention in the telephoto state of FIG. 2, and FIG. 6 is engaged with a cam follower of a straight cylinder. Shows cam groove, etc. 7 is a schematic development view of the second rotating cylinder, FIG. 7 is a schematic development view of the cam cylinder showing the cam groove for the second lens group, the shutter / diaphragm cam groove, and the like, and FIG. FIG. 9 is a schematic development view of the first liner showing a straight groove along the helicoid, a relief groove for inserting the cam follower of the second rotating cylinder, FIG. 9 shows a straight advance groove along the axial direction, a helicoid cam groove, etc. FIG. 10 is a schematic development view of the fixed frame showing FIG. 9 in more detail, and FIG. 11 is a perspective view schematically showing the external configuration of the first rotating cylinder. It is.

1 to 11 includes a first lens group 11, a second lens group 12, a third lens group 13, a fourth lens group 14, a shutter / aperture unit 15, a solid-state imaging device 16, and a first lens. Holding frame 17, cover glass 18, second lens holding frame 19, first cylindrical member 21, second cylindrical member 22, first liner 23, third cylindrical member 24, second liner 25, cam cylinder 26, rectilinear cylinder 27, third lens holding frame 28, fourth cylindrical member 29, first seal member 31, second seal member 32, third seal member 33, fixed frame 41, first rotary cylinder 42, a second rotating cylinder 43, a zoom motor 51, and a fourth group motor 52.
With reference to FIG. 2 and FIG. 3, taking a telephoto state and a wide angle state as an example, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 are The shutter / aperture unit 15 is inserted between the second lens group 12 and the third lens group 13 and is arranged on the image plane side of the fourth lens group 14. A solid-state imaging device 16 configured using an oxide semiconductor) or a CCD (charge coupled device) is disposed. The first lens group 11 to the fourth lens group 14 constitute a zoom lens having a variable focal length. The first lens group 11 is composed of one or more lenses, and is fixedly held on the rectilinear cylinder 27 via a first lens holding frame 17 that integrally holds the first lens group 11.

The second lens group 12 is composed of one or more lenses, and a cam follower 19a formed on the second lens holding frame 19 that integrally holds the second lens group 12 is a cam cylinder whose development is shown in FIG. 26 is inserted into the cam groove 26 for the second lens group and engaged with the rectilinear groove 25 a of the second liner 25, and is supported by the cam cylinder 26 and the second liner 25. The shutter / aperture unit 15 includes a shutter and an aperture stop, and a cam follower (not clearly shown) formed integrally with the shutter / aperture unit 15 is provided in the development view of FIG. The cam groove 26 is inserted into the shutter / diaphragm cam groove, engages with the rectilinear groove 25a of the second liner 25, and is supported by the cam cylinder 26 and the second liner 25.
As shown in FIGS. 9 and 10, a straight advance groove and a helicoid cam groove along the axial direction are formed on the inner surface of the fixed frame 41. As shown in FIG. 11, a helicoid cam follower formed on the outer peripheral surface of the base end portion of the first rotating cylinder 42 is engaged with the helicoid cam groove of the fixed frame 41. A key that protrudes from the outer periphery of the base end portion of the first liner 23 is engaged with the groove. A guide groove is formed on the inner surface of the first rotating cylinder 42 along a surface orthogonal to the optical axis, and is a follower that is a linear guide member protruding from the outer peripheral surface in the vicinity of the base end portion of the first liner 23. (Or key) is engaged. As shown in FIG. 8, a linear groove and a helicoid are formed along the optical axis direction on the inner surface of the first liner 23, and the first liner 23 has a portion near the proximal end portion of the second rotating cylinder 43. An escape groove for inserting a cam follower protruding from the outer peripheral surface is formed.

A helicoid is formed on the outer peripheral surface of the base end portion of the second rotating cylinder 43, and is screwed into the helicoid provided on the inner periphery of the first liner 23, and the base end portion of the second rotating cylinder 43 A cam follower protruding on the outer peripheral surface in the vicinity is engaged with a linear groove provided on the inner periphery of the first rotating cylinder 42 through the liner (linear groove) of the first liner 23. A key portion protruding from the outer periphery of the base end portion of the second liner 25 is engaged with the linear groove provided on the inner periphery of the first liner 23. A guide groove along a surface orthogonal to the optical axis is formed on the inner surface of the second rotating cylinder 43, and a follower (or key) that is a linear guide member protruding from the outer peripheral surface of the second liner 25. Is engaged. With such a configuration, the second liner 25 moves integrally with the second rotary cylinder 43 with respect to the movement in the optical axis direction, but the second rotary cylinder 43 rotates and moves with respect to the second liner 25. It can be done.
The cam cylinder 26 fitted to the inner circumference of the second liner 25 has a locking projection projected on the outer circumference of the base end part fitted and locked to the base end part of the second rotary cylinder 43, so that the second The rotary cylinder 43 is integrally rotated. A guide groove is formed on the inner surface of the second liner 25 along a surface orthogonal to the optical axis, and a follower (or key) that is a straight guide member provided on the outer peripheral surface (front side) of the cam cylinder 26. Are engaged. With such a configuration, the cam cylinder 26 moves integrally with the second liner 25 with respect to the movement in the optical axis direction, but the cam cylinder 26 can relatively rotate with respect to the second liner 25. It is like that.

The rectilinear cylinder 27 is inserted between the second rotary cylinder 43 and the second liner 25 on the base end side, and a cam follower projects from the outer peripheral surface near the base end of the rectilinear cylinder 27. The cam follower engages with a cam groove formed on the inner peripheral surface of the second rotating cylinder 43, and a rectilinear groove is formed on the inner peripheral surface of the rectilinear cylinder 27 along the axial direction. The key part of the outer peripheral surface of the liner 25 is engaged. A gear portion is formed on the outer periphery of the base end portion of the first rotating cylinder 42, and the driving force of the zoom motor 51 is appropriately transmitted through the gear to be rotated, whereby the first lens group 11, The two lens group 12 and the shutter / aperture unit 15 perform a zooming operation in a predetermined manner.
The cam groove of the second rotating cylinder 43 that engages with the cam follower of the rectilinear cylinder 27 is shown in FIG. 6, and the cam groove of the cam cylinder 26 that engages with the cam follower of the lens holding frame of the second lens group 12 is shown in FIG. FIG. 7 shows the cam groove of the cam barrel 26 that engages with the cam follower of the shutter / aperture unit 15. The cam groove of the first liner 23 that engages with the cam follower of the second rotating cylinder 43 and the linear groove of the first liner 23 that engages with the key part of the second liner 25 are shown in FIG. 9 shows a rectilinear groove of the fixed frame 41 that engages with the key portion of the first liner 23 of the fixed frame 41 and a cam groove of the fixed frame 41 that engages with the cam follower of the first rotating cylinder 42. .

That is, generally, the rotating cylinder closest to the outermost fixed cylinder is screwed into the fixed cylinder by the helicoid, and the helicoid moves at a constant speed from the shape. For this reason, in the wide-angle position during which it is gradually driven from the retracted retracted state to the telephoto position via the wide-angle position, it is common that the rotary cylinder is drawn out about halfway. On the other hand, in the above-described configuration, the first rotating cylinder 42 is engaged with the fixed cylinder portion of the fixed frame 41 by a helicoid-shaped cam groove rather than simply screwing in the helicoid, and from the stored state. By driving to the wide angle position, the first rotary cylinder 42 is fully extended to the maximum extension position, and thereafter, the object side end of the cam groove is parallel to the end face of the fixed cylinder as shown in FIG. In the driving from the wide-angle position to the telephoto position, the first rotating cylinder 42 rotates at a fixed position without moving the rotating cylinder in the optical axis direction.
When the first rotating cylinder 42 moves from the retracted state to the wide angle position, the first rotating cylinder 42 is first rotated to the object side while rotating, and when the maximum rotating position is reached, a zoom position detector installed on the fixed frame 41, for example, a photo A zoom position reference signal is generated by a zoom position detector composed of a reflector, a photo interrupter, a leaf switch, or the like. Therefore, when this zoom position reference signal is generated, it can be considered that the first rotating cylinder 42 has reached the maximum extended position, so that the retractable lens holding frame, that is, the third lens holding frame 28 in this example, is lighted. An approaching operation can be started in the axial direction.

Next, the third lens group 13 will be briefly described. The third lens group 13 is a zooming lens that is composed of one or more lenses and can perform a zooming operation mainly by moving along the optical axis direction, and retracts outside the inner diameter of the fixed frame when housed. To do.
The fourth lens group 14 will be briefly described. The fourth lens group 14 is composed of one or more lenses, and is a focus lens that can mainly perform a focusing operation by moving along the optical axis direction. E) Retreat outside the inner diameter of the fixed frame 41.
Next, features of the first embodiment according to the present invention will be described mainly with reference to FIG. 4 and FIG.
FIG. 4 is an enlarged view of the periphery of the first seal member 31 that seals between the fixed frame 41 and the first rotating cylinder 42. In the first embodiment according to this embodiment, the first seal member 31 shown in FIG. 4 is a member having elasticity and magnetic force, such as a bond magnet (also referred to as a rubber magnet or a sheet magnet). The first cylindrical member 21 and the second cylindrical member 22 are made of a magnetic member such as a Ni—Fe alloy plated for preventing oxidation.

The first cylindrical member 21 is integrally attached to the outer peripheral portion in the vicinity of the end portion of the fixed frame 41, and the end portion is appropriately protruded, and the tip is bent inwardly (in the radial inner periphery direction). It is almost L-shaped (inverted L-shaped when viewed from the side), and has a flange portion. An opening is formed on the inner peripheral surface side between the bent portion (ridge portion) and the end of the fixed frame 41. A fixing portion 21a having an annular groove shape is formed. Further, the second cylindrical member 22 is integrally attached to the outer peripheral portion of the first rotating cylinder 42 at a portion corresponding to the fixed portion 21a. The first seal member 31 is provided such that the outer peripheral portion is fitted into the fixing portion 21 a of the first cylindrical member 21 and the inner peripheral edge portion 31 a is in contact with the outer peripheral surface 22 a of the second cylindrical member 22. The first seal member 31 is in watertight pressure contact with the fixed portion 21a of the first tubular member 21 and the outer peripheral surface 22a of the second tubular member 22 by magnetic attraction. At this time, after the mounting, the outer peripheral portion of the first seal member 31 may be fixed to the fixing portion 21a of the first tubular member 21 with an adhesive 32c or the like as necessary.
By setting it as such a structure, the fixing force of the fixing | fixed part 21a of the 1st cylindrical member 21 and the outer peripheral part of the 1st seal member 31 is the fixing | fixed part 21a of the 1st cylindrical member 21 in the non-bonding state. It is controlled by the contact area of the first seal member 31 and the magnetic force of the first seal member 31. The pressure contact force on the inner peripheral edge portion 31a of the first seal member 31 and the outer peripheral surface 22a of the second cylindrical member 22 is the second cylindrical shape having the elasticity and magnetic force of the first seal member 31 and magnetism. It can be controlled by three parameters including the contact area of the first seal member 31 with the outer peripheral surface 22a of the member 22.

For this reason, since the shape of the first seal member 31 is not so complicated and accuracy in a range exceeding the process capability is not required, parts can be manufactured at low cost. Further, since the first seal member 31 and the first tubular member 21 can be adsorbed and fixed by the magnetism of the first seal member 31 and the first tubular member 21, the ease of assembly is improved and the assembly facility is provided. Costs can be reduced and assembly work time can be shortened, and operational stability can be improved under normal temperature, high temperature environment or low temperature environment, and deterioration of water tightness under high temperature environment can be prevented.
Further, in the second embodiment according to this embodiment, the first seal member 31 shown in FIG. 4 is configured by a member having elasticity and magnetic force, such as a bond magnet, and the first cylindrical member 21 is For example, the second cylindrical member 22 is made of a nonmagnetic metal such as aluminum, and a magnetic member such as a Ni-Fe alloy plated for preventing oxidation. Is done. The first cylindrical member 21 is integrally attached to the outer peripheral portion in the vicinity of the end portion of the fixed frame 41, the end portion is appropriately projected, the tip is bent inward, and the cross section is substantially L-shaped, Between the bent portion and the end portion of the fixed frame 41, a fixed portion 21a having an annular groove shape opened to the inner peripheral surface side is formed. Further, the second cylindrical member 22 is integrally attached to the outer peripheral portion of the first rotating cylinder 42 at a portion corresponding to the fixed portion 21a.

The first seal member 31 is provided such that the outer peripheral portion is fitted into the fixing portion 21 a of the first cylindrical member 21 and the inner peripheral edge portion 31 a is in contact with the outer peripheral surface 22 a of the second cylindrical member 22. The first seal member 31 is water-tightly fixed to the fixing portion 21a of the first cylindrical member 21 with an adhesive 32c or the like, and is water-tight to the outer peripheral surface 22a of the second cylindrical member 22 by a magnetic adsorption force. It is in pressure contact.
With such a configuration, the pressure contact force at the inner peripheral edge portion 31 a of the first seal member 31 is made equal to the elastic force and the magnetic force of the first seal member 31 and the outer peripheral surface 22 a of the second cylindrical member 22. It can be controlled by three parameters, the contact area, and without complicating the shape of the first seal member 31, it does not require accuracy beyond the process capability, and parts can be manufactured at low cost. It can improve the operational stability under normal temperature, high temperature environment or low temperature environment, improve the operation stability under normal temperature, high temperature environment or low temperature environment, and water tightness under high temperature environment. Deterioration can be suppressed.

  FIG. 5 is an enlarged view of the periphery of the second seal member 32 that seals between the first rotary cylinder 42 and the second rotary cylinder 43. The second seal member 32 shown in FIG. 5 is composed of a member having elasticity and magnetic force, such as a bond magnet (also referred to as a rubber magnet or a sheet magnet), for example. The cylindrical member 24 is made of a member having magnetism, such as a Ni—Fe alloy plated with oxidation prevention. The second cylindrical member 22 is integrally attached to the outer peripheral portion in the vicinity of the end portion of the first rotating cylinder 42, the end portion is appropriately projected, the tip is bent inward, and the cross section is substantially L-shaped. A fixed portion 22b is formed between the bent portion and the end portion of the first rotary cylinder 42. The fixed portion 22b has an annular groove shape that opens to the inner peripheral surface side. The third cylindrical member 24 is integrally attached to the outer peripheral portion of the second rotating cylinder 43 at a portion corresponding to the fixed portion 22b. The second seal member 32 is provided such that the outer peripheral portion is fitted into the fixing portion 22 b of the second cylindrical member 22, and the inner peripheral edge portion 32 a is in contact with the outer peripheral surface 24 a of the third cylindrical member 24. At this time, the outer diameter of the outer peripheral portion of the second seal member 32 is set smaller than the inner diameter in the annular groove of the fixing portion 22b of the second cylindrical member 22, and the outer periphery of the outer peripheral portion of the second seal member 32 is set. There is a gap between the surface 32 b and the inner peripheral wall surface 22 c in the annular groove of the fixing portion 22 b of the second cylindrical member 22. The second seal member 32 is in watertight pressure contact with the fixed portion 22b of the second cylindrical member 22 and the outer peripheral surface 24a of the third cylindrical member 24 by magnetic attraction force.

At this time, the outer peripheral portion of the second seal member 32 is adsorbed by a magnetic force inside the folding surface of the fixed portion of the second cylindrical member 22, so that the second cylindrical member 22 and the third cylindrical shape are in this portion. Positional errors such as eccentricity with the member 24 and dimensional errors such as eccentricity of the second seal member 32 can be absorbed. After the mounting, the outer peripheral portion of the second seal member 32 may be fixed to the fixing portion 22b of the second cylindrical member 22 with an adhesive 32c or the like as necessary.
With such a configuration, the fixing force between the fixing portion 22b of the second cylindrical member 22 and the second seal member 32 is such that the fixing portion 22b of the second cylindrical member 22 and the second sealing member 32 are not bonded. And the magnetic force of the second seal member 32 are controlled. The pressure contact force between the inner peripheral edge portion 32 a of the second seal member 32 and the outer peripheral surface 24 a of the third cylindrical member 24 is the elastic force and the magnetic force of the second seal member 32, and the third cylindrical member 24. It can be controlled by three parameters including the contact area of the second seal member 32 with the outer peripheral surface 24a.
For this reason, without complicating the shape of the second seal member 32 and requiring accuracy in a range exceeding the process capability, parts can be manufactured at low cost, and the magnetic force of the second seal member 32 can be reduced. And can be easily fixed to the second cylindrical member 22 by the magnetism of the second cylindrical member 22, and further, by providing a gap between the inner peripheral wall surface 22c and the outer peripheral surface 32b, the third cylindrical member can be fixed. Positional errors between the outer peripheral surface 24a of the member 24 and the inner peripheral edge portion 32a of the second seal member 32 can be absorbed, so that assembling simplicity can be improved and assembling equipment costs can be reduced and assembling work time can be shortened. It is possible to improve the operational stability under normal temperature, high temperature environment or low temperature environment, and to suppress deterioration of water tightness under high temperature environment.

The third sealing member 33 that seals between the second rotating cylinder 43 and the rectilinear cylinder 27 is also adhered to the third cylindrical member 24 and the rectilinear cylinder 27 that are adhered to the second rotating cylinder 43. The same configuration as the first seal member 31 shown in FIG. 4 is applied using the fourth tubular member 29. A configuration similar to that of the second seal member 32 shown in FIG. 5 may be applied. These configurations can be appropriately selected and applied to all portions to be sealed, and all may be the same configuration.
Next, features of the second embodiment according to the present invention will be described with reference to FIGS. In this case, since only the shape of the seal member is different, the description will be made assuming that the second seal member 32 'is used instead of the second seal member 32 in FIG.
FIG. 12 shows the shooting state such as the extended state, that is, the telephoto state, and the second seal member 32 ′ is fixed to the fixing portion 22 b of the second cylindrical member 22 at the outer peripheral portion. The inner peripheral edge portion 32a ′ that is in pressure contact with the outer peripheral surface 24a forms a belt-like contact surface that is in close contact with the outer peripheral surface 24a of the third cylindrical member 24 as shown in the figure, and the outer peripheral portion and the inner peripheral edge portion 32a ′. The thin film is formed so as to exhibit sufficient flexibility. Also in this case, for example, a gap may be provided between the outer peripheral surface 32b ′ of the outer peripheral portion and the inner peripheral wall surface 22c of the fixing portion 22b of the second cylindrical member 22 to absorb the position error.

FIG. 13 shows a retraction state, for example, a photographing state in a wide-angle state, and the second seal member 32 ′ is in a range where deformation between the outer peripheral portion and the inner peripheral portion 32 a ′ is possible as shown in the drawing. The inner peripheral edge portion 32 a ′ is brought into contact with the outer peripheral surface 24 a of the third cylindrical member 24 in a state where the belt-like contact surface that closely adheres along the outer peripheral surface 24 a of the three cylindrical member 24 is pulled inward and retracted to some extent. It slides in close contact with the magnetic attractive force to maintain a watertight state.
The lens barrel described above is not limited to a camera such as a digital camera, and can be used by being incorporated into various imaging devices.

1 is a perspective view illustrating a configuration of a lens barrel portion in a retracted storage state in which a lens group is retracted and stored in an imaging optical system unit of a camera that is an imaging device incorporating a lens barrel according to a first embodiment of the present invention. It is the typical perspective view seen. FIG. 2 is a schematic longitudinal sectional view showing a lens barrel in a telephoto (long focal length) state in which the lens group of the lens barrel of FIG. FIG. 2 is a schematic longitudinal sectional view showing a lens barrel in a wide angle (short focal length) state in which a lens group of the lens barrel of FIG. FIG. 3 is an enlarged view around a first seal member in a telephoto state of the lens barrel in FIG. 2. FIG. 3 is an enlarged view of the vicinity of a second seal member in the telephoto state of the lens barrel of FIG. 2. FIG. 4 is a schematic development view of a second rotating cylinder showing cam grooves and the like that engage with a cam follower of a straight cylinder of the lens barrel of FIG. FIG. 2 is a schematic development view of a cam cylinder showing a cam groove for a second lens group, a shutter / diaphragm cam groove, and the like of the lens barrel of FIG. 1. FIG. 3 is a schematic development view of a first liner showing a linear groove along the optical axis direction of the lens barrel of FIG. 1, a helicoid, a relief groove for inserting a cam follower of a second rotating cylinder, and the like. FIG. 2 is a schematic development view of a fixed frame showing a rectilinear groove and a helicoid cam groove along the axial direction of the lens barrel of FIG. FIG. 10 is a schematic development view of the fixed frame showing FIG. 9 in more detail. It is a perspective view which shows typically the external appearance structure of the 1st rotation cylinder of the lens barrel of FIG. It is an enlarged view of the vicinity of the second seal member in the extended telephoto state of the lens barrel in the imaging optical system unit of the camera which is an imaging apparatus incorporating the lens barrel according to the second embodiment of the present invention. FIG. 13 is an enlarged view around the second seal member in the retracted wide-angle state of the lens barrel of FIG. 12.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 1st lens group 12 2nd lens group 13 3rd lens group 14 4th lens group 15 Shutter / aperture unit 16 Solid-state image sensor 17 1st lens holding frame 18 Cover glass 19 1st lens holding frame 21 1st cylindrical member 21a fixed part 22 second cylindrical member 22a outer peripheral surface 22b fixed part 22c inner peripheral wall surface 23 first liner 24 third cylindrical member 24a outer peripheral surface 25 second liner 26 cam cylinder 27 rectilinear cylinder 28 third lens holding frame 29 4th cylindrical member 31 1st sealing member 31a Inner peripheral edge part 32 2nd sealing member 32a Inner peripheral edge part 32b Outer peripheral surface 32c Adhesive agent 33 3rd sealing member 41 Fixed frame 42 1st rotary cylinder 43 2nd Rotating cylinder 51 Zoom motor 52 Fourth group motor

Claims (5)

A first cylindrical member having a flange projecting radially inward and formed into a hollow cylindrical shape and using a magnetic material;
Provided at least in the vicinity of the fixed portion of the first cylindrical member so as to move relative to the first cylindrical member in the hollow portion of the first cylindrical member, and magnetically A second cylindrical member made of a material having
It has an annular shape, has elasticity, has a magnetic force at least at the outer peripheral portion and the inner peripheral portion, the outer peripheral portion is attracted to the fixed portion of the first tubular member by a magnetic attractive force, and the inner peripheral portion is the first A seal member that is in sliding contact with the outer peripheral surface of the second cylindrical member while being in pressure contact with the magnetic attractive force;
A lens barrel characterized by comprising:   2. The lens mirror according to claim 1, wherein a gap is provided between an inner peripheral wall surface of the fixed portion of the first cylindrical member and an outer peripheral wall surface of the outer peripheral portion of the seal member. Torso. A first cylindrical member having a flange projecting radially inward and formed into a hollow cylindrical shape;
Provided at least in the vicinity of the fixed portion of the first cylindrical member so as to move relative to the first cylindrical member in the hollow portion of the first cylindrical member, and magnetically A second cylindrical member made of a material having
It has an annular shape, has elasticity, has at least an inner peripheral portion with magnetic force, an outer peripheral portion is fixed to the fixed portion of the first cylindrical member, and an inner peripheral portion is an outer periphery of the second cylindrical member A seal member that is in sliding contact with the surface while being pressed by magnetic attraction;
A lens barrel characterized by comprising:   The lens barrel according to any one of claims 1 to 3, wherein the seal member is configured to exhibit a magnetic force using a bonded magnet.   An imaging apparatus comprising an imaging lens using the lens barrel according to claim 1.

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