JP2021144073A - Fixing structure, lens barrel, and optical instrument - Google Patents

Abstract

To provide a fixing structure capable of easily detaching a top from a barrel member at disassembly.SOLUTION: In a fixing structure 2, a cylindrical top 40 having a through-hole 40A is disposed in a fitting hole 20A of a barrel member 20 so that an edge on the side of a member 30 to be fixed of the top 40 is located in a recess 30B of the member 30 to be fixed. A screw 8 passes through the through-hole 40A of the top 40, and the member 30 to be fixed is fixed to the barrel member 20 by being fastened to a fastening hole 30A. A protrusion 30C is formed in the recess 30B of the member 30 to be fixed, and a release part 40E is formed on an edge of the side of the member 30 to be fixed of the top 40. An inclined plane is formed at at least one end part in the circumferential direction of the release part 40E and the protrusion 30C, and in a fixed state, the protrusion 30C of the member 30 to be fixed is put into the release part 40E of the top 40.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fixed structure in a lens barrel, a lens barrel provided with this fixed structure, and an optical device.

Conventionally, in a lens barrel, a fixed member such as a lens holding frame is fixed to a barrel member constituting the lens barrel. A fixed structure for fixing the fixed member in the lens barrel to the tubular member is required to have high position accuracy in order to ensure optical performance. However, there are variations in the processing accuracy and finish of the members constituting the lens barrel, and if the fixed member is directly fixed to the tubular member, high positional accuracy cannot always be obtained.

Therefore, as a fixing structure for fixing the member in the lens barrel with high position accuracy, as described in Patent Document 1, a mounting hole is formed in the barrel member of the lens barrel, and the mounting hole is formed. A method is used in which a piece is fitted into the frame, the outer peripheral surface of the piece is engaged with the inner peripheral surface of the mounting hole, and a fastening member such as a screw is inserted into the through hole of the piece to fix the member to be fastened. In the fixing structure using this top, the top is fitted into the mounting hole of the member to be fixed, and the fastening member is inserted into the fastening hole of the top to fix it. Will be done. As a result, the accuracy of the mounting position can be improved.

Japanese Unexamined Patent Publication No. 2005-156970

Here, in the fixed structure using a coma, the inner peripheral surface of the mounting hole of the tubular member and the outer peripheral surface of the coma are engaged without a gap. It is difficult to remove the lens, and there is a problem that the frame and the tubular member are damaged.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a fixed structure in which a top can be easily removed from a tubular member at the time of disassembly.

The fixing structure of the present invention is a fixing structure for fixing a fixed member to a cylindrical member, in which a mounting hole is formed in the tubular member, and a fastening hole and a recess around the fastening hole are formed in the fixed member. Is formed, and a cylindrical piece having a through hole is arranged in the mounting hole of the tubular member so that the edge of the piece on the fixed member side is located in the recess of the fixed member, and the fastening member is the piece. The fixed member is fixed to the cylindrical member by passing through the through hole and being fastened to the fastening hole, and a protrusion is formed in the recess of the fixed member and the edge of the top on the fixed member side. A relief portion is formed, an inclined surface is formed at at least one of the relief portion and the protrusion portion in the circumferential direction, and the protrusion portion of the fixed member is inserted into the relief portion of the coma in the fixed state. And.

A factor that makes it difficult to remove the top from the tubular member is that the outer peripheral surface of the top fits tightly into the inner peripheral surface of the mounting hole of the tubular member. On the other hand, in the present invention, in the fixed state, the protrusion of the member to be fixed is inserted into the relief portion of the top. Since an inclined surface is formed at at least one end of the relief portion of the top and the protrusion portion of the fixed member in the circumferential direction, the edge of the relief portion and the protrusion come into contact with each other by rotating the top. Then the top is lifted. As a result, the top can be easily removed from the tubular member.

According to the present invention, there is provided a fixed structure in which a top can be easily removed from a tubular member at the time of disassembly.

It is sectional drawing along the axial direction of the part including the fixed structure in the lens barrel according to one Embodiment of this invention. It is a perspective view which looked at the lens barrel from the outside in the radial direction of the fixed structure shown in FIG. It is a perspective view seen from the outside in the radial direction which shows the vicinity of the fastening hole of the fixed member of the lens barrel of a fixed structure shown in FIG. 1 enlarged. It is a perspective view seen from the head side which shows the top in the fixed structure shown in FIG. It is a perspective view which shows the top in the fixed structure shown in FIG. 1 and was seen from the small diameter part side. It is sectional drawing which shows the piece in the fixed structure shown in FIG. 1 along the axis of the piece.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of a portion of the lens barrel according to an embodiment of the present invention including a fixed structure along the axial direction. FIG. 2 is a perspective view of the fixed structure shown in FIG. 1 as viewed from the outside in the radial direction of the lens barrel. The left-right direction in FIG. 1 is the direction along the optical axis of the lens barrel, the upper direction is the direction away from the optical axis, and the lower direction is the direction toward the optical axis.

As shown in FIG. 1, the fixing structure 2 of the present embodiment is a structure for fixing the fixed member 30 to the cylinder member 20 in the lens barrel 1, and uses a top 40 and a screw 8 as a fastening member. The fixed member 30 is fixed to the inside of the tubular member 20 in the radial direction.

The lens barrel 1 is attached to the camera body, for example, to form a camera as an optical device. In the lens barrel 1 of the present embodiment, a plurality of tubular members are arranged concentrically and coaxially, and a plurality of lens groups are arranged inside the lens barrel 1. The total length of the lens barrel 1 can be changed by moving a plurality of tubular members in a nested manner, and at the same time, by moving a plurality of lens groups in the optical axis direction, a wide-angle state and a telephoto state can be obtained. And can be switched. In the present embodiment, the tubular member 20 is a cylindrical member that constitutes the lens barrel 1. Further, the fixed member 30 is a support member that supports the lens frame that holds the lens group.

As shown in FIG. 2, the tubular member 20 has a substantially cylindrical shape, and a mounting hole 20A having a circular cross section extending in the radial direction is formed. As shown in FIG. 1, the mounting holes 20A are located in the radial direction (lens) with the large-diameter hole portion 20B located on the outer side in the radial direction of the lens barrel 1 (the direction away from the optical axis of the lens barrel). Includes a small-diameter hole portion 20C (in the direction toward the optical axis of the lens barrel). The inner diameter of the large-diameter hole portion 20B is larger than the inner diameter of the small-diameter hole portion 20C.

FIG. 3 is a perspective view seen from the outside in the radial direction, showing the vicinity of the fastening hole of the fixed member of the fixed structure lens barrel shown in FIG. 1 in an enlarged manner.
As shown in FIG. 3, the fixed member 30 is formed with a fastening hole 30A for passing the screw 8 and an annular recess 30B formed around the fastening hole 30A. The inner diameter of the recess 30B is substantially equal to the outer diameter of the large diameter portion 44 of the top 40.

The fastening hole 30A is columnar and extends in the radial direction, and a screw is formed on the inner peripheral surface. In the recess 30B, a cylindrical cylindrical portion 30D is erected along the edge of the fastening hole 30A. The outer diameter of the cylindrical portion 30D is substantially equal to the inner diameter of the second large-diameter hole portion 40D of the top 40. Further, on the bottom surface of the annular recess 30B, a protrusion 30C is formed so as to extend outward in the radial direction of the fastening hole 30A from the outer surface of the cylindrical portion 30D. The protrusion 30C has an isosceles trapezoidal cross section, and both side surfaces in the circumferential direction are formed as inclined surfaces.

4A to 4C show a top in the fixed structure shown in FIG. 1, FIG. 4A is a perspective view seen from the head side, FIG. 4B is a perspective view seen from the small diameter portion side, and FIG. 4C is along the axis of the top. It is a cross-sectional view.
As shown in FIG. 4, the frame 40 is formed in a substantially cylindrical shape and has a through hole 40A extending in the axial direction. The frame 40 has a head 42, a large diameter portion 44 continuously extending in the axial direction to the head 42, and a small diameter portion 46 continuously extending in the axial direction to the large diameter portion 44. The outer diameter of the head 42 is larger than the outer diameter of the large diameter portion 44, and is substantially equal to the inner diameter of the large diameter hole portion 20B of the mounting hole 20A of the tubular member 20. The outer diameter of the large diameter portion 44 is larger than the outer diameter of the small diameter portion 46, and is substantially equal to the inner diameter of the small diameter hole portion 20C of the mounting hole 20A of the tubular member 20. The outer diameter of the small diameter portion 46 is substantially equal to the outer diameter of the recess 30B of the fixed member 30. On the upper surface of the head 42, a pair of notches 42A extending in the radial direction are formed at positions sandwiching the through hole 40A.

An annular projecting portion 40F projecting inward in the radial direction is formed over the entire circumference in the axially intermediate portion of the through hole 40A. The through hole 40A includes a first large-diameter hole 40B on the head 42 side of the annular protrusion 40F, a second large-diameter hole 40D on the small-diameter 46 side of the annular protrusion 40F, and a second large-diameter hole 40D. It is located between the large-diameter hole portion 40B of 1 and the second large-diameter hole portion 40D, and includes a small-diameter hole portion 40C inside the annular protrusion 40F in the radial direction. The inner diameter of the first large-diameter hole portion 40B is larger than the inner diameter of the small-diameter hole portion 40C, and is larger than the outer diameter of the head portion 8A of the screw 8. The inner diameter of the second large-diameter hole portion 40D is slightly larger than the outer diameter of the cylindrical portion 30D of the fixed member 30. The inner diameter of the small-diameter hole portion 40C is smaller than the outer diameter of the head portion 8A of the screw 8 and slightly larger than the outer diameter of the shaft portion 8B of the screw 8. A pair of relief portions 40E are formed on the lower edge of the small diameter portion 46 of the frame 40. The relief portion 40E is formed at a position opposite to the through hole 40A. The relief portion 40E is formed as inclined surfaces on both sides in the circumferential direction, and the depth of the relief portion 40E is larger than the height of the protrusion 30C formed in the recess 30B of the fixed member 30.

The screw 8 has a substantially cylindrical shaft portion 8B and a head portion 8A attached to one end of the shaft portion 8B. On the outer peripheral surface of the shaft portion 8B, a screw thread that can be screwed into the screw thread on the inner peripheral surface of the fastening hole 30A is formed.

Next, a method of fixing the fixed member 30 to the tubular member 20 by the fixing structure of the present embodiment will be described. First, the fixed member 30 is arranged inside the tubular member 20 in the radial direction so that the fastening hole 30A of the fixed member 30 is coaxial with the mounting hole 20A of the tubular member 20. Then, the frame 40 is inserted into the mounting hole 20A of the tubular member 20 so that the small diameter portion 46 is located inward in the radial direction. As a result, the large diameter portion 44 of the top 40 is located in the small diameter hole portion 20C of the mounting hole 20A, the head 42 of the top 40 is located in the large diameter hole portion 20B of the mounting hole 20A, and the top 40 is a cylinder. It does not protrude from the surface of the member 20. Further, the small diameter portion 46 of the top 40 advances to the inside of the tubular member 20, the small diameter portion 46 enters the recess 30B of the fixed member 30, and the lower edge of the small diameter portion 46 comes into contact with the bottom surface of the recess 30B. Further, in this state, the protrusion 30C formed in the recess 30B of the fixed member 30 is located in the relief portion 40E of the frame 40.

Then, in this state, the shaft portion 8B of the screw 8 is inserted into the through hole 40A of the top 40, and the screw 8 is rotated by a tool such as a screwdriver to be screwed into the fastening hole 30A of the fixed member 30. As a result, the head portion 8A of the screw 8 comes into contact with the radial outer surface of the annular protrusion 40F, and the top 40 is fixed to the fixed member 30 by the screw 8. Further, the large-diameter portion 44 of the top 40 is fitted into the small-diameter hole portion 20C of the tubular member 20, and the head 42 of the top 40 is located in the large-diameter hole portion 20B of the tubular member 20. The frame 40 is fixed to the above. With such a configuration, the fixed member 30 is fixed to the tubular member 20 by the top 40 and the screw 8.

Next, a method of disassembling the fixed structure of the present embodiment will be described.
First, the screw 8 is rotated by a tool such as a screwdriver to be removed from the fastening hole 30A of the member to be fixed 30. As a result, the fixed member 30 can be separated from the tubular member 20. Next, a tool such as a flat-blade screwdriver is fitted into the cutout portion 42A of the top 40 to rotate the top 40. When the top 40 rotates, one inclined surface of the relief portion 40E of the top 40 comes into contact with the inclined surface of the protrusion 30C provided in the recess 30B of the fixed member 30. Then, by further rotating the top 40, the rotational force of the top 40 is converted into a force that causes the top 40 to rise from the recess 30B of the fixed member 30 due to the inclined surface. As a result, the top 40 is lifted from the mounting hole 20A of the tubular member 20, and the head 42 of the top 40 protrudes from the outer surface (upper surface of FIG. 1) of the tubular member 20, so that the top 40 can be easily removed. ..

According to this embodiment, the following effects are achieved.
In the conventional fixed structure, since the top is fitted into the mounting hole of the tubular member without a gap, it is difficult to remove the top at the time of disassembly. On the other hand, in the present embodiment, the protrusion 30C of the fixed member 30 is inserted into the relief portion 40E of the frame 40 in the fixed state. Since an inclined surface is formed at the circumferential end of the relief portion 40E of the top 40 and the protrusion 30C of the fixed member 30, by rotating the top 40, the edge of the relief portion 40E and the protrusion 30C are formed. And come into contact with each other, and the frame 40 is lifted. As a result, the top 40 can be easily removed from the mounting hole 20A of the tubular member 20.

Further, in the present embodiment, a notch 42A is formed on the outer surface of the head 42 of the top 40. As a result, the frame 40 can be easily rotated by inserting the tool into the notch portion 42A.

Further, in order to make the lens barrel compact, it is preferable that members such as other tubular members are arranged in contact with each other on the outside of the tubular member 20 constituting the lens barrel. On the other hand, in the fixed structure 2 of the present embodiment, the frame 40 does not protrude from the surface of the tubular member 20 in the fixed state. Therefore, other members such as a tubular member can be arranged outside the tubular member 20 constituting the lens barrel, and the lens barrel can be made compact. If the frame 40 does not protrude from the surface of the tubular member 20, it is difficult to remove the frame 40. However, according to the fixed structure of the present embodiment, the frame 40 can be easily rotated as described above. The frame 40 can be removed.

Further, in the present embodiment, the fixed member 30 is arranged inside the tubular member 20. As a result, since the frame 40 is located outside the tubular member 20, the frame 40 can be easily removed.

In the present embodiment, the cross sections of both the protrusion 30C of the fixed member 30 and the relief portion 40E of the top 40 are isosceles trapezoidal, and the fixed member 30 has inclined portions on both sides in the circumferential direction. An inclined surface may be formed at at least one end of the protrusion 30C and the relief portion 40E of the top 40 in the circumferential direction.

Further, in the present embodiment, the fixed member 30 is arranged inside the tubular member 20, but the present invention is not limited to this, and the present invention can be applied even when the fixed member 30 is fixed to the outside of the tubular member 20.

Further, in the present embodiment, the case where the support member that supports the lens frame that holds the lens group is fixed as the fixed member 30 has been described, but the present invention is not limited to this, and the case where other members are fixed to the tubular member Also, the present invention can be applied.

1 Lens barrel 2 Fixed structure 8 Screw 8A Head 8B Shaft 20 Cylinder member 20A Mounting hole 20B Large diameter hole 20C Small diameter hole 30 Fixed member 30A Fastening hole 30B Recess 30C Protrusion 30D Cylindrical part 40 Top 40A Through hole 40B First large-diameter hole 40C Small-diameter hole 40D Second large-diameter hole 40E Relief 40F Ring protrusion 42 Head 42A Notch 44 Large-diameter 46 Small-diameter part

Claims (6)

It is a fixed structure that fixes the fixed member to the tubular member in the lens barrel.
A mounting hole is formed in the tubular member.
The fixed member is formed with a fastening hole and a recess around the fastening hole.
A cylindrical top having a through hole is arranged in the mounting hole of the tubular member so that the edge of the top on the fixed member side is located in the recess of the fixed member, and the fastening member is the top. The member to be fixed is fixed to the cylindrical member by passing through the through hole and being fastened to the fastening hole.
A protrusion is formed in the recess of the fixed member, and a relief portion is formed at the edge of the top on the fixed member side.
An inclined surface is formed at at least one of the relief portion and the protrusion portion in the circumferential direction.
A fixing structure characterized in that, in the fixed state, the protrusion of the member to be fixed is inserted into the relief portion of the top. A notch is formed on the surface of the top on the cylinder member side.
The fixed structure according to claim 1. In the fixed state, the top does not protrude from the surface of the tubular member.
The fixed structure according to claim 1 or 2. The fixed member is arranged inside the tubular member.
The fixed structure according to any one of claims 1 to 3. Cylinder member and
A fixed member fixed to the tubular member is provided.
The lens barrel, wherein the fixed member is fixed to the tubular member by the fixing structure according to any one of claims 1 to 4. An optical device including the main body of the optical device and the lens barrel according to claim 5.

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