JP2001350078A - Lens barrel tripod mount - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To provide a tripod seat of a lens barrel capable of finely adjusting the weight balance between the lens barrel and the camera body. A tripod seat includes a positioning mechanism for rotating an annular member, which is helicoidally coupled to a fixed barrel of a lens barrel, and a pedestal attached to the annular member.
And By rotating the tripod seat around the fixed cylinder with the screw of the positioning mechanism loosened, the annular member can move in the optical axis direction. The screw hole 14b is moved so as to be substantially at the position of the center of gravity of the camera body and the lens barrel, and a tripod mounting screw is screwed into the screw hole to fix the tripod seat to the tripod. Select the vertical and horizontal position of the camera body,
Screw the positioning mechanism to fix the lens barrel. Accessories for the camera body (motor drive device and strobe)
When the camera body is attached, the camera body becomes heavy. Therefore, the tripod seat is rotated around the fixed barrel to fix the screw hole to the camera body side so that the tripod seat is fixed to the tripod.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tripod seat for a lens barrel for fixing the lens barrel to a tripod.

[0002]

2. Description of the Related Art A large super telephoto lens barrel includes, for example,
A tripod seat 100 as shown in FIG. 5 is provided. The tripod seat 100 has an annular portion 120 rotatably fitted to the lens barrel 10 and a pedestal portion 140 fixed to the tripod. FIG. 6 is a cross-sectional view of the pedestal portion 140, in which a plurality of screw holes 140a to 140c are formed. Annular part 120
And the pedestal portion 140 are integrally formed, and the tripod seat 100 can be rotated with respect to the lens barrel 10 with the clamp screw 130 loosened. Tighten the clamp screw 130 at a desired position, and tighten the screw holes 140a to 140c.
Is selected and the tripod mounting screw is screwed in.
Is fixed on a tripod.

[0003]

A camera body to which the above-mentioned lens barrel is attached is usually equipped with various accessories such as a motor drive device, a power supply thereof, and a strobe device. These devices are relatively large and often heavy.

In the conventional tripod seat, the movement of the center of gravity due to the attachment / detachment of these attachments to / from the camera body is adjusted by selecting one of the screw holes 140a to 140c. I could only do it. Therefore, the center of gravity cannot be accurately adjusted when the attached device is attached to or detached from the camera body, and the weight balance at the time of shooting cannot be accurately adjusted. Had to do.

In order to solve this problem, it is possible to mount an adapter composed of a rack and pinion between the tripod mount and the tripod. However, since the center of gravity of the adapter rises from the tripod head, this is not possible. It has the disadvantage of being stable.

An object of the present invention is to provide a tripod seat for a lens barrel which can finely adjust the weight balance between the lens barrel and the camera body in consideration of such problems.

[0007]

According to the present invention, in order to achieve the above-mentioned object, in a tripod seat of a lens barrel for fixing the lens barrel to a tripod, a helicoid connection is rotatably connected to the lens barrel. An annular member, a positioning mechanism for positioning the annular member in the rotational direction with respect to the lens barrel, and a pedestal integrally formed with the annular member, wherein the pedestal is screwed with a mounting screw of the tripod. A hole is formed, and the tripod seat is a tripod seat of the lens barrel, which moves in the optical axis direction while rotating around the lens barrel.

According to this configuration, the position of the center of gravity can be freely moved according to attachment / detachment of the accessory, so that the weight balance between the camera body and the lens barrel can be appropriately adjusted.

[0009]

1 and 2 show a lens barrel 1 according to the present invention.
FIG. 1 is a view illustrating the appearance of an example of a tripod seat 20 with 0, and FIG. 1 shows a state in which the lens barrel is extended to the tripod seat, and FIG. 2 shows a state in which the lens barrel is extended to the tripod seat. I have. The tripod seat 20 includes an annular member 12 that is helicoidally coupled to the fixed barrel 11 of the lens barrel 10, a positioning mechanism 13 for rotating the annular member 12 with respect to the fixed barrel 11, and an annular member 1
And a pedestal 14 attached to the base 2. At the center of the pedestal 14, a screw hole 14b into which a mounting screw (not shown) protruding from a tripod is screwed is formed as in FIG. On its side surface, a target 14a for mounting on a tripod is provided.

FIG. 3 is a cross-sectional view of a portion indicated by a circle in FIG. 2 and is a detailed view of a portion where the fixed cylinder 11 and the annular member 12 are helicoid-coupled. As shown in the figure, a male helicoid screw 15 is formed on the fixed cylinder 11, and a female helicoid screw 16 is formed almost all around the inside of the annular member 12.

FIG. 4 is a sectional view showing the structure of the positioning mechanism 13 in a direction orthogonal to the optical axis. FIG. 4A shows a state in which the tripod seat 20 is movable in the optical axis direction while rotating around the fixed cylinder 11. FIG. 4B shows a locked state of the positioning mechanism 13, that is, a state in which the lens barrel 10 and the tripod seat 20 are fixed.

The annular member 12 has a screw hole 12a. The positioning mechanism 13 includes a screw portion 13a screwed into the screw hole 12a and a clamp portion 13b.
(B) shows a state in which the fixed cylinder 11 and the tripod seat 20 are fixed by fastening 13b to a part 11a of the male helicoid cut out of the fixed cylinder 11 by cutting out a part thereof.

Next, an example of how to use the tripod seat of this embodiment will be described. It is assumed that the lens barrel 10 has a camera body (not shown) already mounted on the mount 30.
By rotating the tripod seat 20 around the fixed cylinder 11 with the screws of the positioning mechanism 13 loosened, the annular member 1
2 can move in the optical axis direction. The screw hole 14b is moved so as to be substantially at the center of gravity of the camera body and the lens barrel 10, and a tripod mounting screw is screwed into the screw hole 14b to fix the tripod seat 20 to the tripod. Then, the vertical position and the horizontal position of the camera body are selected, and the positioning mechanism 13 is screwed in to fix the lens barrel 10.

On the other hand, when accessories (motor drive device or strobe) are attached to the camera body, the camera body becomes heavy. Fix it on a tripod so that it approaches the side. Of course, after fixing to a tripod, the position of the center of gravity can be freely moved by rotating the lens barrel 10 and the camera body around the optical axis.

With such a configuration, the position of the center of gravity can be freely moved in accordance with attachment / detachment of accessories, so that an optimal state of the weight balance in the photographing state can be selected. The center of gravity moves by a quarter pitch of the helicoid in the vertical position and the horizontal position, but since it is a small amount, the weight balance is not so bad.

[0016]

According to the tripod seat of the present invention, since the weight balance between the lens barrel and the camera body can be freely adjusted, it is possible to perform stable photography.

[Brief description of the drawings]

FIG. 1 is an external view of an interchangeable lens according to the present invention.

FIG. 2 is an external view of the interchangeable lens of the present invention.

FIG. 3 is a cross-sectional view of a lens barrel and a tripod seat.

FIG. 4 is a sectional view of a positioning mechanism.

FIG. 5 is an external view of a conventional interchangeable lens.

FIG. 6 is a sectional view of a conventional tripod seat.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lens barrel 11 Fixed cylinder 12 Annular member 13 Positioning mechanism 14 Pedestal 14b Screw hole 20 Tripod seat 30 Mount

Claims (1)

[Claims] 1. A tripod seat of a lens barrel for fixing a lens barrel to a tripod, wherein: an annular member rotatably helicoidally coupled to the lens barrel; and a rotational direction of the annular member with respect to the lens barrel. A positioning mechanism for performing positioning, a pedestal having an integral structure with the annular member, wherein the pedestal is formed with a screw hole into which a mounting screw for the tripod is screwed; A tripod seat for a lens barrel, which moves in the optical axis direction while rotating around.