JP2009145510A - Lens barrel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that it is difficult to photograph after stably fixing a camera to a tripod and setting a photographing posture due to the weight of a lens body increased and its gravity center changed with the upsizing of the lens. <P>SOLUTION: In the lens barrel for a large zoom lens of an internal focusing system, a lens barrel 2 having a camera connection mount 12 is connected to the rear part of a fixed cylinder serving as an outer cylinder. A revolving mechanism for freely rotating the lens barrel 2 at the rear part is set. The camera mounted in a photographing posture is rotated and moved. Thereby vertical photographing and horizontal photographing are facilitated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a lens barrel having a revolving mechanism for a large lens in vertical position shooting and horizontal position shooting of a mounted camera.

In system cameras such as single-lens reflex cameras, diversified interchangeable lenses are appearing one after another, and the shooting range that has never existed has expanded. However, as a further demand from users, a brighter lens with a longer focal length is required. Yes.

However, as the lens barrel becomes longer in the optical axis direction and the lens diameter increases as the lens brightness increases, the lens body increases in both volume and weight. It is not uncommon to exceed the weight of For this reason, when this type of lens is attached, it is necessary to shoot while holding the lens, but this is not easy to hold by hand, and it is almost impossible to shoot with the lens barrel fixed on a tripod or the like. Is common.

Shooting in this case uses a method of fixing the tripod to the tripod screw of the lens barrel, but to change the posture of the camera shooting vertical position and horizontal position, it is necessary to convert the tripod fixing device to the vertical position, Because of this conversion, it is inevitable that the center of gravity moves and becomes unstable.

For this reason, as shown in Patent Document 1, a mirror that can be fitted to a lens barrel and can change a vertical position photographing posture and a horizontal position photographing posture by rotating a ring with a tripod screw that can rotate around an optical axis. Propose a tube. In Patent Document 2, a holding device having a tripod seat can be externally attached to a large lens barrel, and the photographing posture can be varied by rotating the device.

However, these devices have the disadvantage that the position of the tripod mount must avoid the operation ring and extension position of the lens barrel, and cannot always be installed at the center of gravity of the lens barrel. Was uneasy about holding strength.
JP 11-337800 A JP 2005-215217 A

Provided is a lens barrel in which a large lens barrel can be stably fixed to a tripod and can be taken in a vertical position and a horizontal position by a quick and easy operation in accordance with a photographer's intention of photographing.

In the inner focus type large zoom lens barrel, a barrel with a camera coupling mount is connected to the rear of the fixed barrel that is the outer barrel, and a revolving mechanism is installed to make the rear barrel rotatable. In addition, a click stop is provided at the 90 ° opening angle position of the vertical position and the horizontal position, and the vertical position shooting and the horizontal position shooting are facilitated by rotating the attached camera to the click stop position.

Even with a heavy lens barrel fixed by a tripod, it is possible to arbitrarily switch between vertical position shooting and horizontal position shooting without changing the attitude of the lens.

The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view of a large lens barrel according to the present invention mounted on a camera, FIG. 2 is a rear view showing a revolving state in which the camera can be changed vertically and horizontally with respect to a fixed barrel, and FIG. 4 is a disassembled perspective view of the rear barrel showing the mechanism, and FIG. In the drawings, the same members are denoted by the same reference numerals.

The large lens barrel shown in FIG. 1 includes a plurality of lens frames arranged along the optical axis L and stacked with a plurality of lens frames that are respectively held. It is connected to the rear part and is divided into two parts, a rear barrel 2 having a small outer diameter. The fixed cylinder 1 is provided with a fixed lens group (not shown) at the head, and after that, a zooming moving lens group and a focusing moving lens group are arranged together with a movable mechanism, and then a part of the rear fixed lens. A lens barrel having a fixed lens group 3 fixed thereto, and the rear lens barrel 2 has the remaining fixed lens group 4 and the fixed lens group 5 among the rear fixed lens groups as shown in FIG. It has a configuration that is retained.

FIG. 4 is a cross-sectional view of the rear portion of the large lens barrel in which a plurality of lens groups are arranged along the optical axis L. The shaded portion is the portion of the rear barrel 2, and the camera is located at the rear end. The coupling mount 12 is fixed, and the camera 20 can be mounted as shown in FIG. FIG. 4 shows a structure in which the rear lens barrel 2 is connected to the fixed cylinder 1, and will be described together with FIG. 3 which is an exploded view of this part. There is an end tube 6, and the rotating tube 7 can be inserted into the inner side 6 a of the rear end tube 6, and is in a loosely fitted state that can rotate around the optical axis L.

The rotating cylinder 7 is inserted between the rotation receiving portion 6a inside the rear end cylinder 6 of the fixed cylinder 1 and the stepped section 6c, and is put on the annular surface 6b of the rear end cylinder 6 by the holding ring 8, and is held by the annular surface 6b. If the screw 8 is fixed with screws through a plurality of holes 8d around the vertical surface 8a of the optical axis L of the ring 8, the rotary cylinder 7 is sealed inside the rear end cylinder 6 of the fixed cylinder 1 and can be rotated without play. Can be constructed.

The rotating cylinder 7 installed inside the rear end cylinder 6 of the fixed cylinder 1 has a surface 7a perpendicular to the optical axis L and a step surface 7b, and 7a is pressed against the back surface of the pressing ring 8, and 7b Is slightly protruded from the inner opening of the holding ring 8 toward the rear. The vertical surface 7a of the rotary cylinder 7 has one deep hole 7c. When the coil spring 9 and the steel ball 10 are embedded in the hole 7c, the steel ball 10 presses the back surface of the holding ring 8 by the coil spring 9. become. Since the press contact surface of the holding ring 8 has holes 8b and 8c at 90 ° intervals, when the rotating cylinder 7 is rotated, the steel ball 10 jumps into the holes at each 90 ° interval, and click stop It becomes the effect.

Next, the rear barrel 2 is assembled so as to cover the rear end barrel 6 of the fixed barrel 1. The rear barrel 2 is fixed to the screw hole 7 d on the inner surface 7 b of the rotary barrel 7 from the inner hole 2 a of the rear barrel by an unillustrated screw. The rear barrel 2 can be coupled to the rotary barrel 7. This is a form in which the rear barrel 2 is connected to the rear portion of the fixed cylinder 1, and is rotatable with respect to the fixed cylinder 1 through the rotary cylinder 7.

The diaphragm mechanism and the circuit unit 11 are inserted and fixed from the rear of the rear barrel 2, and the rear frame 13 to which the mount 12 is fixed is attached to the mounting hole 13 a and the rear end vertical surface 2 b of the rear barrel 2 by screws (not shown). If it fixes to the rear lens barrel 2 through the screw hole 2c, the assembly connected to the fixed cylinder of the rear lens barrel 2 will be completed. When the back cover 15 shown in FIG. 4 is attached from the rear and the rear frame 13 is covered, the exterior is completed.

When a tripod is attached to the tripod seat 1 a of the fixed barrel 1 and the camera 20 is mounted on the mount 12 at the rear end of the rear barrel 2, the steel ball 10 of the rotating barrel 7 is placed in the hole 8 c of the holding ring 8. The click stop position that jumps in is the horizontal position shooting posture of the camera shown in FIG. 2A. When the rear barrel 2 is rotated 90 ° to the left together with the camera, the steel ball 10 of the rotary barrel 7 moves and the holding ring 8 is moved. The click stop position that jumps into the hole 8b is the vertical position photographing posture of the camera shown in B. As described above, the rear barrel 2 is structured to be rotatable with respect to the fixed barrel 1, so that the camera can be rotated at an arbitrary angle. However, since the click stop position can be recognized sensuously, It is possible to quickly and easily set shooting and lateral position shooting.

In addition, a lock knob 14 is attached to the rear barrel 2 so that the outer peripheral band 8e of the holding ring 8 is directly below the lock knob 14 when the rear barrel 2 is connected to the fixed barrel 1 as shown in FIG. It has become. The lock knob 14 has a screw shape. When the lock knob 14 is turned clockwise, the tip portion is lowered, and the outer peripheral band 8e of the holding ring 8 can be pressed down to lock the rotation of the rear barrel 2. By turning it, it can be unlocked. For this reason, the camera 20 can be photographed not only at the click stop position but also at an arbitrary rotation angle position.

It is an external appearance perspective view of the state which attached the camera to the large sized lens barrel of this invention. It is a figure which shows the revolving state which can change a camera to a vertical / horizontal imaging position. It is a disassembled perspective view of a fixed cylinder rear part and a rear lens barrel showing a revolving mechanism. It is a cross-sectional view of a fixed cylinder rear part and a rear lens barrel.

Explanation of symbols

1.
Fixed cylinder 2.
2. Rear barrel
Fixed lens group 4.
Fixed lens group 5.
Fixed lens group 6.
Rear end tube 7.
Rotating cylinder 8
Holding ring 9.
Coil spring
10. Steel balls11. Diaphragm mechanism and circuit unit 12. Mount 13. Rear frame 14. Lock knob
20. camera

Claims (3)

In an interchangeable lens in which a plurality of lens groups having a large aperture are arranged in the optical axis direction, fixed lens groups are arranged at both ends, and a zooming moving lens group and a focusing moving lens group are arranged in the middle. A lens barrel of a focal-type large zoom lens, comprising the fixed lens group disposed at the tip, the zooming moving lens group, the focusing moving lens group, and a part of the rear fixed lens group. The outer tube of the lens barrel is a fixed tube, and the lens barrel connected to the fixed tube is the lens barrel formed by the remaining part of the rear fixed lens group, and the rear end portion of the lens barrel Is a lens barrel having a camera-coupled mount fixed and rotatable about the optical axis. The lens barrel connected to the rear part of the fixed cylinder is loosely fitted inside the rear end cylinder of the rear part of the fixed cylinder so as to be rotatable, and then the rotary cylinder is moved to the rear part of the fixed cylinder by a holding ring. 2. A lens barrel according to claim 1, wherein said lens barrel is sealed to said rear end tube, and is coupled to said rotary tube by a screw from the rear so as to be rotatable. 2. The lens barrel according to claim 1, wherein the lens barrel is rotatable, can be fixed at an arbitrary rotation angle, and has a click stop at a 90 ° rotation position to facilitate setting of vertical and horizontal position shooting of the camera. 2. The lens barrel according to 2.

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