JP4265254B2 - Support section mounting structure and lens barrel - Google Patents

Description

[0001]
The present invention camera, a video camera, the support leg mounting structure for mounting the support legs in the lens barrel to be attached to an optical apparatus such as binoculars, and a lens barrel provided with the same.
[0002]
[Prior art]
FIG. 5 is a cross-sectional view showing a conventional pedestal. Here, as an example, a tripod seat for attaching a tripod is shown.
The pedestal (here, tripod mount) 21 extends from the lens barrel so as to be substantially parallel to the optical axis of a lens barrel (not shown), for example. The pedestal 21 includes a plurality of engaging portions 22 and 23, for example. These engaging portions 22 and 23 are provided with holes that are substantially perpendicular to the optical axis of the lens barrel. The two engaging portions 22 include, for example, a 1/4 inch tripod screw bushing on the inner wall of the hole, and can be screwed to a tripod having a male screw having a diameter of 1/4 inch. One engaging portion 23 includes, for example, a 3/8 inch tripod screw bush on the inner wall of the hole, and can be screwed into a tripod having a male screw having a diameter of 3/8 inch.
[0003]
As another pedestal, there was one in which a 1/4 inch tripod screw bush or a 3/8 inch tripod screw bush was provided on the inner wall of all the holes. Moreover, the monopod seat for attaching a monopod is provided with, for example, only a 1/4 inch tripod screw bush on the inner wall of the hole.
[0004]
In addition to the pedestal, a lens barrel support device is proposed in which a flat part is provided on the ring part rotatably attached to the lens barrel, and a screw bush such as a female screw is provided on the flat part. (For example, refer to Patent Document 1).
[0005]
[Patent Document 1]
JP-A-8-122605 [0006]
[Problems to be solved by the invention]
However, the conventional pedestal described above has the following problems.
(1) In the monopod seat, a support leg (monopod, tripod) having a male screw corresponding to a 3/8 inch tripod screw bush cannot be attached to the lens barrel.
(2) In the tripod mount, the 1 / 4-inch tripod screw bushing and the 1 / 8-inch tripod screw bushing are arranged at different positions, so the photographer can choose a monopod according to the diameter and position of each screw bushing. It was necessary to attach a tripod, etc., and the position where the support leg could be attached was limited.
[0007]
An object of the present invention is to provide a lens barrel supporting portion mounting structure of the supporting portion such as various support legs can be easily attached, and the lens barrel provided with the same.
[0008]
[Means for Solving the Problems]
The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this. That is, the invention of claim 1 is provided inside the hole of the pedestal, and includes a first threaded portion (2) that can be threadedly engaged with the first male screw (7a) having a large diameter, and the first male screw ( 7a) having a second male screw (8a) smaller in diameter than the second male screw (8a), a second screwing part (3) that can be screwed together, and a contact part that can come into contact with the first male screw; A moving portion movable in the axial direction of the first male screw, and the moving portion is fixed at a fixed position inside the hole, and the second screwing portion (3) is the second male screw. And when the first screwing portion (2) is screwed with the first male screw (7a) , the contact portion comes into contact with the first male screw, and the first screwing portion supporting unit mounting in which but characterized it is retractable to the retracted position within the different said hole and the fixing position from the locked position so as to be screwed with the first male screw It is an elephant.
[0010]
According to a second aspect of the invention, the support unit mounting structure according to claim 1, in the interior of the hole, the support portion mounting, characterized in that, the guide portion for guiding the movement of the moving portion is provided Structure.
The invention of claim 3 is characterized in that, in the support portion mounting structure according to claim 1 or 2, the biasing member (4) for biasing the moving portion to the fixed position is provided. It is the support part attachment structure to do.
[0011]
According to a fourth aspect of the present invention , in the support portion mounting structure according to any one of the first to third aspects, the moving portion includes a flange portion (3h), and the hole is provided inside the hole. The support portion mounting structure includes a positioning portion (1c) that determines the fixed position of the moving portion by contacting the flange portion (3h).
[0012]
A fifth aspect of the present invention is a lens barrel including the support portion mounting structure according to any one of the first to fourth aspects .
A sixth aspect of the invention is the lens barrel according to the fifth aspect, wherein the pedestal is provided with a plurality of the holes.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a partial cross-sectional view of an embodiment of a support leg mounting structure 100 according to the present invention. In this specification, the support leg mounting structure 100 includes the base 1 having a structure for mounting a support leg (monopod, tripod, etc.) to the lens barrel 20. Since the lens barrel 20 can be a conventional lens barrel, description thereof will be omitted as appropriate.
The pedestal 1 includes a plurality (here, three) of engaging portions 10 and the like. The pedestal 1 is provided, for example, in a ring portion 21 that is rotatably attached to the lens barrel 20. The pedestal 1 is disposed substantially parallel to the optical axis A of the lens barrel 20.
[0014]
FIG. 2 is an enlarged cross-sectional view of the engaging portion 10. Hereinafter, in order to describe the internal configuration of the engaging portion 10, based on the positional relationship among the pedestal 1, the lens barrel 20, and support legs (described later) 7, 8, for convenience, “lens barrel side” “support leg side” Is used.
The engaging portion 10 includes, for example, a hole 1d provided in a direction B substantially perpendicular to the optical axis A, a thin cylindrical member (bush) 3 that is movably inserted into the hole 1d, and a hole A high-precision coil screw (helisert) 2 attached to the support leg side of 1d and a compression coil spring 4 provided on the lens barrel side of the hole 1d are provided.
[0015]
The hole 1d will be described. The inner peripheral surface of the hole 1d has different diameters on the lens barrel side and the support leg side. On the inner peripheral surface of the hole 1d on the lens barrel side, key grooves 1b are formed at desired intervals (for example, at intervals of 180 °) toward the outside. A compression coil spring 4 is inserted on the lens barrel side of the hole 1d. In order to hold the compression coil spring 4, a lid plate for closing the hole 1d on the lens barrel side of the hole 1d. 5 is attached by a set screw 6. The key groove 1b is formed continuously from the cover plate 5 to the end face 1c (described later).
[0016]
On the other hand, the inner peripheral surface on the support leg side of the hole 1d has a smaller diameter than the inner peripheral surface on the lens barrel side. Due to the difference in diameter, an end surface 1c is formed on the inner peripheral surface of the hole 1d. On the inner peripheral surface of the hole 1d on the support leg side, for example, a female screw is formed by a screw groove. The female screw is provided with a helisert 2 for widening the load distribution of the female screw and stabilizing the screwing with a support leg having a large-diameter male screw (for example, 3/8 inch: described later). .
[0017]
Next, the bush 3 will be described. The bush 3 is, for example, a cylindrical member that is inserted into the hole 1d so as to be movable (slidable), and includes a flange 3h. On the inner peripheral surface of the bush 3, a female screw portion 3g that can be screwed with a small-diameter male screw (for example, 1/4 inch: described later) is formed.
The bush 3 is inserted into the hole 1d so that, for example, the flange 3h is positioned on the lens barrel side. A key portion 3a is provided on the outer peripheral surface 3e of the bringe portion 3h toward the outside. The key portion 3a is slidably engaged with the key groove 1b described above. In addition, the outer diameter of the outer peripheral surface 3 d on the support leg side of the bush 3 is smaller than the inner diameter of the above-described Helisart 2.
[0018]
One end of the compression coil spring 4 is attached to, for example, the cover plate 5, and the other end is in contact with the flange end surface 3c that is the lens barrel side end surface of the flange portion 3h. As a result, the bush 3 is biased toward the support leg by the compression coil spring 4. The compression coil spring 4 can extend until the flange end surface 3b, which is the end surface on the support leg side of the flange portion 3h, contacts the end surface 1c formed in the hole 1d (at this time, the other end of the compression coil spring 4 is attached). Located in the force limit position). Further, the end surface 3f of the support leg side of the helisert 2 and the end surface 3f of the support leg side of the bush 3 are formed so as not to protrude from the end surface 1a of the pedestal 1 on the support leg side.
[0019]
Next, an operation when a support leg (here, a tripod) is attached to the engaging portion 10 will be described.
FIG. 3 is a view showing a state in which a support leg having a large-diameter male screw is attached to the engaging portion 10.
The support leg 7 has a male screw 7a having a large diameter (3/8 inch). The photographer or the like rotates the male screw 7 a by aligning the male screw 7 a of the support leg 7 with the position of the helisert 2. As a result of this rotation, the helicate 2 and the male screw 7a are screwed (engaged), and when the rotation is continued, the end surface 7c of the male screw 7a is in contact with the end surface 3f of the bush 3, and the bush 3 is moved to the lens mirror. Move to the tube side. Thereafter, the end surface 7 b of the support leg 7 and the end surface 1 a of the pedestal 1 come into contact with each other, whereby the support leg 7 is attached to the engaging portion 10.
[0020]
FIG. 4 is a view showing a state in which a support leg having a small-diameter male screw is attached to the engaging portion 10.
The support leg 8 has a male screw 8a having a small diameter (1/4 inch). The photographer, for example, rotates the male screw 8 a by aligning the male screw 8 a of the support leg 8 with the position of the bush 3. By this rotation, the female screw portion 3g of the bush 3 and the male screw 8a are screwed together, and when the rotation continues, the end surface 8b of the support leg 8 and the end surface 1a of the base 1 come into contact with each other, A support leg 8 is attached to 10. Further, since the bush 3 is biased toward the support leg by the compression coil spring 4, the bush 3 and the male screw 8 a can be easily screwed by simply aligning the male screw 8 a with the position of the bush 3. Can start.
[0021]
However, in this case, a state where the flange end surface 3b of the bush 3 and the end surface 1c of the hole 1d are not in contact with each other (a state where the bush 3 is floating) is also assumed. Therefore, it is necessary to consider a state where the support leg 8 is not completely attached to the engaging portion 10.
In the engaging portion 10 according to the present embodiment, the male screw 8 a is further rotated in order to completely attach the support leg 8 to the engaging portion 10. After that, the key portion 3a formed on the bush 3 is guided by the key groove 1b formed on the hole 1d, and the bush 3 moves to the support leg side, and the flange end surface 3b and the end surface 1c of the hole 1d are connected. Contact. At this time, the bush 3 is pulled in to the support leg side, and the flange end surface 3b comes into pressure contact with the end surface 1c. Thereby, the support leg 8 is completely attached to the engaging part 10.
[0022]
According to the present embodiment, (1) since the helicate 2 and the bush 3 having different diameters are provided in the same hole 1d, the support leg 7 having a large-diameter male screw 7a that can be screwed into the helicate 2; A support leg 8 having a small-diameter male screw 8 a that can be screwed into the bush 3 can be attached to the same position of the base 1.
(2) When the large-diameter male screw 7a and the helisert 2 are screwed together, the bush 3 is movably inserted into the hole 1d, so that the end surface 7c of the male screw 7a is connected to the end surface 3f of the bush 3. The bush 3 is pressed to the lens barrel side and moved to the lens barrel side. Thereby, the external thread 7a and the helisert 2 can be screwed together.
(3) When the small-diameter male screw 8a and the bush 3 are screwed together, the bush 3 is biased toward the supporting leg by the compression coil spring 4, so that the male screw 8a is connected to the female screw 3g of the bush 3. While aligning, the male screw 8a and the bush 3 can be completely screwed together by continuing to rotate the male screw 8a until the flange end surface 3b of the bush 3 contacts the end surface 1c of the hole 1d.
[0023]
(Deformation)
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
(1) The screwing between the helicate 2 and the male screw 7a and the screwing between the bush 3 and the male screw 8a are based on the screwing of the female screw and the male screw, but are not limited to this. A knock pin or the like that can be engaged may be provided so that it can be engaged at a desired position.
[0024]
(2) Although the three engaging portions 10 are provided on the base 1, the present invention is not limited to this, and an appropriate number of engaging portions 10 may be provided at appropriate positions on the base 1. As a result, the photographer or the like can mount the support leg (monopod or tripod) at a desired position, and can perform photographing under favorable photographing conditions (for example, photographing at a well-balanced position).
[0025]
(3) Since the bush 3 is urged toward the support leg by the compression coil spring 4, the bush 3 can be easily started by the compression coil spring 4. The compression coil spring 4 may not be provided, as long as it is located on the support side.
[0026]
(4) Although only one bush 3 is inserted into the hole 1d, a bush having a female screw portion smaller in diameter than the female screw portion 3g of the bush 3 is inserted into the bush 3 in a nested manner. It may be. Thereby, at least three male screws (three support legs) having different diameters can be attached to the same position of the base 1.
[0027]
【The invention's effect】
As described in detail above, (1) the engaging portion includes a first screwing portion that can be screwed with a large-diameter first male screw, and a second screwing portion that can be screwed with a small-diameter second male screw. And the second threaded portion is provided in the engaging portion and is movable between the retracted position and the fixed position, and when the first threaded portion and the first male screw are threaded together When the second screwing portion and the second male screw are screwed together, the support leg having the large first male screw and the small diameter are retracted to the retracting position. The support leg having the second male screw can be securely attached to the same engaging portion.
[0028]
(2) Since the second screwing portion is movable in the axial direction within the first screwing portion, the second screwing portion has a support leg having a large-diameter first male screw as the first screwing portion. When attaching, it surely moves to the retracted position, and when attaching the supporting leg having the second male screw with a small diameter to the second screwing portion, it can surely move to the fixed position.
[0029]
(3) Since the urging member for urging the second screwing portion to the fixed position is further provided, the second screwing portion is urged to the fixing position and has a small-diameter second male screw. The leg can be easily attached to the second threaded portion.
[0030]
(4) Since the engaging portion includes a positioning portion that determines a fixing position of the second screwing portion by contacting a flange portion provided in the second screwing portion, By restricting the movement range, it is possible to prevent the end face on the support leg side of the second screwing portion from protruding from the engaging portion.
[0031]
(5) Since the pedestal is provided with a plurality of engaging portions, the support leg can be mounted at a desired position of the photographer or the like, and photographing under favorable photographing conditions can be performed.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of an embodiment of a support leg mounting structure 100 according to the present invention.
FIG. 2 is an enlarged cross-sectional view of the engaging portion 10;
FIG. 3 is a view showing a state in which a support leg having a large-diameter male screw is attached to the engaging portion 10;
FIG. 4 is a view showing a state in which a support leg having a small-diameter male screw is attached to the engaging portion 10;
FIG. 5 is a cross-sectional view showing a conventional pedestal.
[Explanation of symbols]
1 Pedestal 1b Key groove 1c End face 1d Hole part 2 Helisert 3 Bushing 3a Key part 3b, 3c Flange end face 3h Flange part 4 Compression coil spring 5 Cover plate 6 Set screw 7 Large-diameter support leg 7a Large-diameter male screw 8 Small-diameter support Leg 8a Small-diameter male screw 10 Engaging portion 20 Lens barrel 21 Ring portion 100 Support leg mounting structure A Optical axis B In a direction substantially perpendicular to the optical axis

Claims (6)

A first threaded portion provided inside the hole of the pedestal and capable of being threadedly engaged with the first male screw having a large diameter ;
A second screwed portion that can be screwed with a second male screw having a smaller diameter than the first male screw; and a contact portion that can come into contact with the first male screw; A moving part movable in the axial direction of the male screw ,
The moving portion is fixed at a fixed position inside the hole, the second screwing portion can be screwed with the second male screw, and the first screwing portion is the first male screw. and the contact portion is in contact with the first male screw when screwed, different said hole and the fixing position from the locked position such that the first engagement portion is capable screwed with the first male screw supporting unit mounting structure for it is retractable inside the retracted position, the said. In the support part mounting structure according to claim 1 ,
A support portion mounting structure characterized in that a guide portion for guiding the movement of the moving portion is provided inside the hole . In the support part attachment structure of Claim 1 or Claim 2 ,
Supporting unit mounting structure, characterized in that, with a biasing member for biasing the moving portion in the fixed position. In the support part attachment structure of any one of Claim 1- Claim 3 ,
The moving part includes a flange part,
A support portion mounting structure characterized in that a positioning portion that determines the fixed position of the moving portion by contacting the flange portion is provided inside the hole .   A lens barrel provided with the support part mounting structure according to any one of claims 1 to 4.   The lens barrel according to claim 5,
A lens barrel in which the base is provided with a plurality of the holes.

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