JPH0972490A - Tripod seat for lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify vibration insulation for photograph freed from blurring by using a tripod seat for a photograph lens and a video lens. SOLUTION: A tripod seat leg part 12 having a three-leg ring 11 on which a lens mirror cylinder body 10 and a three-leg seat bed part 13 having a three- leg screw part 13c are hinged together by means of a moving arm 14 energized through the force of a spring 15 and energization is effected in a direction in which the tripod seat leg part 12 is pushed up. An elastomer damper 17 is located between the tripod seat leg part 12 and the tripod seat bed part 13 and by supporting the two parts by a damper shaft 16, vibration of low amplitude of a high frequency transferred from the tripod is absorbed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tripod mount such as a photographic lens and a video camera lens.

[0002]

2. Description of the Related Art It is usual to fix a photographing system to a tripod when taking a picture without blurring. However, when a lens having an extremely large image magnification such as a macro lens or a super telephoto lens is transmitted to the tripod, a slight amount is transmitted to the tripod. Even vibrations will blur and affect the captured image. For this reason, conventionally, a solid tripod that is as robust as possible was used, and a sand bag was placed on the taking lens fixed to the tripod to increase the apparent mass and suppress resonance. In addition, there are active anti-vibration such as VAP method and shift optical system, and passive anti-vibration such as gimbal support method for preventing low-frequency blur such as camera shake.

[0003]

However, the method of placing a sandbag or the like on the photographing system fixed to the tripod in the above-mentioned conventional example is neither convenient nor agile. On the other hand, the latter VAP
Active vibration control such as a system and a shift optical system requires a sensor, an actuator, a power source, etc., which complicates the configuration, and the lens itself is designed exclusively. Also, passive vibration isolation such as a gimbal support method requires a large structure and is costly.

The present invention eliminates the above-mentioned drawbacks of the conventional example, and for a lens having a large image magnification such as a super telephoto lens or a macro lens,
An object of the present invention is to provide a tripod mount for a lens having a vibration isolation mechanism capable of absorbing only high-frequency, low-amplitude vibration transmitted from the tripod when the lens is fixed to the tripod.

[0005]

In order to achieve the above object, the present invention absorbs vibration by incorporating a passive type vibration damping function into a tripod seat of a lens.

[0006]

According to the present invention as set forth in claim 1, by incorporating a damping member for damping vibrations into a tripod seat of a lens, only the vibration of a small amplitude of high frequency transmitted from the tripod when the lens is mounted on the tripod is dampened. Absorbs. In the present invention as set forth in claim 2, the vibration can be easily absorbed by using an elastic member such as an elastomer or a spring as the damping member. According to the present invention as set forth in claim 3, the damping factor of the damping member can be adjusted, so that it is possible to deal with the load of the lens to be attached and the photographing system.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of the main part of this embodiment, and FIG.
Is a front view. In the figure, 10 is a lens barrel body,
Reference numeral 11 denotes a tripod ring attached to the lens barrel body 10, one end portion of which is connected to a tripod seat leg portion 12 which will be described later, and the end portions of which are opposed to each other with a slight gap. Reference numeral 12 is a tripod seat leg portion that connects the tripod ring 11 and has a hinge portion 12a and a damper bearing hole 12b. Reference numeral 13 denotes a tripod base having a hinge portion 13a, a damper shaft guide hole 13b and a tripod screw portion 13c, and 14 movably connects the hinge portion 12a of the tripod base leg 12 and the hinge portion 13a of the tripod base 13. It is a movable arm.

Reference numeral 15 is a torsion spring, which is the tripod base 1
3 is wound around the hinge portion 13a, and both ends thereof are hooked between the tripod base portion 13 and the movable arm 14 to repel the weight of the lens barrel body 10 and set at the set amount of force. The legs 12 are urged in a direction to push them up. Reference numeral 16 denotes a damper shaft, which penetrates a damper bearing hole 12b of the tripod seat leg portion 12 and a damper shaft guide hole 13b of the tripod seat base portion 13 with an elastomer damper 17 interposed therebetween, and the nut 1
At 8, the tripod seat leg portion 12 and the tripod seat base portion 13 are attached. In addition, the damper bearing hole 12 of the tripod seat leg portion 12
b is set to a diameter larger than the diameter of the damper shaft 16 in order to absorb an error due to the swinging of the movable arm 14. Reference numeral 19 is a tightening knob for tightening the other end of the tripod ring 11.

In this embodiment having the above construction, the weight of the lens barrel body 10 and the photographing system is set to the elastomer damper 1.
The structure is supported by 7, and due to the elastic characteristics of the elastomer, the elastomer absorbs and relaxes high-frequency micro-vibration transmitted from the tripod, and it is possible to prevent blurring of the formed image. In addition, the hardness of the elastomer is selected according to the weight of the lens barrel body 10 and the photographing system and the frequency of vibration, and the nut 1
It can be adjusted by the tightening degree of 8.

FIGS. 3 and 4 show a second embodiment of this embodiment. FIG. 3 is a sectional view of the main part of this embodiment, and FIG. 4 is a front view. In the figure, 20 is a lens barrel body, 21
Is a tripod ring attached to the lens barrel body 20, one end of which is connected to a tripod seat leg portion 22 described later, and the end portions of which are opposed to each other with a slight gap. Reference numeral 22 denotes a tripod seat leg portion that connects the tripod ring 21 and has a plurality of damper bearing holes 22a. Reference numeral 23 is a tripod base portion having a plurality of damper shaft guide holes 23a and a tripod screw portion 23b.

Reference numeral 24 denotes a damper shaft, which penetrates a damper bearing hole 22a of the tripod base leg portion 22 and a damper shaft guide hole 23a of the tripod base portion 23 via an elastomer damper 25, and a nut 26. The tripod seat leg portion 22 and the tripod seat base portion 23 are attached. 27 is the tripod ring 21
Is a tightening knob for tightening the other end of the.

In this embodiment having the above-mentioned structure, the damper shaft 2 is provided at a plurality of positions between the tripod seat leg portion 22 and the tripod seat base portion 23.
Since the elastomer damper 25 is held by the nut 4 and the nut 26, the vibration transmitted from the tripod to the lens barrel body 20 can be absorbed. Therefore, it is possible to select the hardness of the elastomer and adjust the damping factor as in the first embodiment.

Although the elastomer damper is used as the elastic member in each of the above-described embodiments, the same function can be achieved by using a coil spring instead.

[0014]

As described above, according to the present invention as set forth in claim 1, a lens having a large image magnification such as a super-telephoto lens or a macro lens is installed by incorporating a damping member for damping vibration in a tripod seat of the lens. It is possible to prevent high-frequency, low-amplitude vibrations transmitted from the tripod, and prevent blurring of the image formation screen. Further, according to the present invention as set forth in claim 2, by using the elastic member as the damping member, it is possible to reduce the size and handle it easily. Further, according to the present invention as set forth in claim 3, the damping factor of the damping member can be adjusted, so that it is possible to easily cope with the load of the lens to be attached and the photographing system, or the frequency of vibration isolation.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a tripod mount of a lens according to a first embodiment of the present invention.

FIG. 2 is likewise a rear view.

FIG. 3 is a vertical cross-sectional view of a tripod seat of the lens according to the second embodiment of the present invention.

FIG. 4 is likewise a rear view.

[Explanation of symbols]

10, 20 ... Lens barrel main body, 11, 21 .. Tripod ring, 12, 22 .. Tripod seat leg portion, 12a .. Hinge portion,
12b, 22a ··· damper bearing part, 13, 23 · · tripod base part, 13a · · hinge part, 13b, 33a · · damper shaft guide part, 13c, 23b · · tripod screw part, 1
4 ... Movable arm, 15 ... Torsion spring, 16, 2
4 ・ ・ Damper shaft, 17,25 ・ ・ Elastomer damper, 18,26 ・ ・ Nut, 19,27 ・ ・ Tightening knob

Claims (3)

[Claims] 1. A tripod mount for a lens incorporating a damping member for damping vibration. 2. The tripod mount for a lens according to claim 1, wherein an elastic member is used as the damping member. 3. The tripod mount for a lens according to claim 1, wherein a damping factor of the damping member is adjustable.