JP6900035B2 - Lens barrel with shockproof structure while being dustproof and splashproof - Google Patents

Description

The present invention relates to a lens barrel having a shock-proof structure while having dust-proof and drip-proof performance.

In recent years, lens barrels have been used in various environments. Therefore, an external force may be applied to the lens barrel. Specifically, it is conceivable that the lens barrel may be accidentally dropped or some object may collide with the lens barrel.

Therefore, Patent Document 1 discloses a lens barrel in which the structure of the hood can be protected by two hoods including a first hood and a second hood arranged inside the first hood.

Further, in Patent Document 2, by arranging the first and second elastic members inside the lens barrel, not only the impact due to the external force acting on the outer cylinder from the object side is alleviated, but also the second elastic member is provided. Disclosed is a lens barrel capable of alleviating an impact caused by an external force acting on the outer barrel from the outside in the radial direction.

Japanese Unexamined Patent Publication No. 2016-102898 Japanese Unexamined Patent Publication No. 2016-114858

The lens barrel described in Patent Document 1 has a double hood structure, so that damage to the hood located on the exterior side can be reduced. However, there is a problem that the lens barrel becomes larger in the radial direction by using the double hood.

Further, since there is no elastic member, an impact such as dropping is directly transmitted to the first lens group, so that there is a problem that the lens performance may be deteriorated.

Further, since the lens barrel described in Patent Document 2 has a lens barrel for sandwiching and fixing the elastic member with the hood in addition to the elastic member between the first lens group and the hood, this is also a lens mirror. There is a problem that the cylinder becomes large.

The present invention has been made in view of such a situation, and an object of the present invention is to provide a lens barrel having impact resistance, preventing the lens barrel from becoming large in size, and having a dust-proof and drip-proof function. ..

The first invention, which is a means for solving the above-mentioned problems, is a lens barrel in which an optical element arranged closest to the subject moves along an optical axis, and holds the optical element and the optical element. A second lens group having a first lens frame portion having the optical axis of the lens barrel as the center and a second lens group having the optical axis as the center and arranged on the outer periphery of the first lens frame portion. A lens barrel having a mirror frame portion and a third mirror frame portion having the optical axis at the center and arranged on the outer periphery of the second mirror frame portion, and the first mirror frame portion is a lens barrel portion. It is arranged so as to be relatively movable with respect to the second mirror frame portion along the optical axis, and the second mirror frame portion and the third mirror frame portion sandwich the first drip-proof rubber in the thrust direction. However, the lens barrel is characterized in that the second mirror frame portion and the third mirror frame portion are screwed in the radial direction.

The second invention, which is a means for solving the above-mentioned problems, is the lens barrel of the first invention, and the first drip-proof rubber is formed with the first mirror frame portion in the radial direction. A lens barrel characterized by being located between the third lens frame and the third lens frame.

Further, the third invention, which is a means for solving the above-mentioned problems, is a lens barrel according to the first invention or the second invention, and the lens barrel is the third lens lens frame portion. A lens barrel having an operating ring adjacent to each other on the subject side in the thrust direction, and having a gap between the third lens mirror frame portion and the operating ring.

Further, the fourth invention, which is a means for solving the above-mentioned problems, is a lens barrel according to any one of the first to third inventions, and the second lens frame portion is a fixed barrel. The lens barrel is characterized in that the second mirror frame portion and the third mirror frame portion sandwich an elastic member in the radial direction.

Further, the fifth invention, which is a means for solving the above-mentioned problems, is the lens barrel of the fourth invention, and the elastic member is the second mirror frame portion and the third lens barrel portion in the thrust direction. A lens barrel characterized by being a second drip-proof rubber sandwiched between the lens frame and the lens frame.

Further, the sixth invention, which is a means for solving the above-mentioned problems, is the lens barrel of the fourth invention or the fifth invention, and the elastic member is the screw and the third in the thrust direction. A lens barrel characterized by being a cushioning material sandwiched between the lens frame and the lens barrel.

According to the present invention, it is possible to provide a lens barrel that has impact resistance, prevents the lens barrel from becoming large in size, and has a dust-proof and drip-proof function.

Cross-sectional view of the lens barrel according to the embodiment of the present invention

Hereinafter, the best mode for carrying out the present invention will be described with reference to the accompanying drawings. The present invention is not limited to this embodiment.

FIG. 1 is a cross-sectional view of the periphery of the first lens group of the lens barrel 1 of this embodiment. Further, the optical axis of the lens barrel 1 is omitted in FIG. 1 because it is located below the range shown in FIG. FIG. 1 has been simplified to simplify the description of the present invention. Unless otherwise specified, the left side of each figure is the subject side and the right side is the image side. Further, in FIG. 1, the vertical direction is the radial direction, and the left-right direction is the thrust direction.

In this embodiment, 1 is a lens barrel, 100 is a first lens, 101 is a first lens chamber, 102 is a first lens retainer, 103 is a first lens group mirror chamber, 111 is a thrust ring, and 200 is a motor base. , 300 is a hood, 301 is a reinforcing ring, 400 is an operating ring, 401 is an operating ring rubber, 500 is a centering fixed shaft, 801 is a cushioning material, 802 is a screw, 803 is a waterproof ring, and 804 is a second waterproof ring. ..

The lens barrel 1 can be attached to and detached from a camera body (not shown), and the mount portion of the lens barrel 1 and the mount portion of the camera body are connected by a bayonet mechanism or the like.

The first lens 100 is a lens located closest to the subject side of the lens barrel 1.

The first lens mirror chamber 101 is a mirror chamber that holds the first lens 100.

The first lens presser 102 presses the first lens mirror chamber 101 into the first lens group mirror chamber 103.

In the first lens group mirror chamber 103, the first lens mirror chamber 101 holding the first lens 100 is pressed by the first lens presser 102.

When a centering step is required when assembling the lens barrel 1, a part of the first lens group is used as the centering group, and the first lens 100, the first lens lens barrel 101, the first lens retainer 102, and the first lens are used. The mirror chamber 103 is adjusted as a centering group.

The thrust ring 111 constitutes a first lens group together with a centering group. When the first lens group moves during focusing or zooming, they move together.

The motor base 200 is a fixed cylinder located on the outer periphery of the first lens group.

The first lens group, which is a moving group during focusing or zooming, moves relative to the motor base 200, which is a fixed group.

The hood 300 is the outer circumference of the motor base 200, and is located closest to the subject among the members constituting the lens barrel 1.

The reinforcing ring 301 sandwiches the waterproof ring 803 with the motor base 200 in the thrust direction. The reinforcing ring 301 moves integrally with the hood 300. In the embodiment of the present application, the reinforcing ring 301 is separate from the hood 300, but may be integrated with the hood 300 as long as the waterproof ring 803 can be sandwiched between the motor base 200 and the hood 300.

Focusing or zooming can be adjusted by adjusting the position of the first lens group by the user appropriately operating the operation ring 400 in the circumferential direction of the lens barrel 1.

Since the operation ring rubber 401 is located on the outer periphery of the operation ring 400 and is integrated with the operation ring 400, the operation ring 400 also moves when the user operates the operation ring rubber 401.

The alignment fixing shaft 500 serves as a fixing shaft for fixing the alignment group adjusted in the alignment process.

The cushioning material 801 is made of an elastic member such as silicon or rubber. It is sandwiched between the hood 300 and the motor base 200.

The screw 802 fixes the hood 300 to the motor base 200.

The cushioning material 801 and the screw 802 for fixing the hood 300 to the motor base 200 are arranged at a plurality of locations on the circumference of the hood 300.

The waterproof ring 803 is made of an elastic member such as silicon or rubber. Since it is sandwiched between the motor base 200 and the reinforcing ring 301, it is fixed. Since the protrusion protruding toward the optical axis is always in contact with the first lens retainer 102, it exhibits a dust-proof and drip-proof function.

The second waterproof ring 804 is made of an elastic member such as silicon or rubber like the waterproof ring 803.

Here, the impact resistance performance of the lens barrel 1 will be described with reference to FIG.

The force received from the subject side (arrow F1 in FIG. 1) of the lens barrel 1 of the embodiment of the present application is an external force F1, and the force received from the side surface of the lens barrel 1 (arrow F2 in FIG. 1) is an external force F2. ..

Then, when the first lens 100 is directed downward and the lens barrel 1 is dropped on the ground, an external force F1 acts on the lens barrel 1. Specifically, the external force F1 in FIG. 1 acts on the hood 300, and the force acts in the order of the reinforcing ring 301 → the waterproof ring 803 → the motor base 200 .... At this time, the present invention makes it possible to absorb the force of the external force F1 by using the waterproof ring 803 made of an elastic member. As a result, the influence of the external force F1 on the image side of the motor base 200 does not have to be exerted.

Next, when the lens barrel 1 receives a force from the side surface of the lens barrel 1, the external force F2 acts on the lens barrel 1. Specifically, the external force F2 in FIG. 1 acts on the hood 300, and the force acts on the cushioning material 801 → the motor base 200. However, the present invention makes it possible to absorb the force of the external force F2 by using the cushioning material 801. As a result, the influence of the external force F2 on the optical axis side of the motor base 200 does not have to be exerted.

Further, in the embodiment of the present application, by using the second waterproof ring 804, it is more surely effective in absorbing the external force against both the external force F1 and the external force F2.

This is because, like the waterproof ring 803 that absorbs the external force F1 that is the thrust direction and the buffer material 801 that absorbs the external force F2 that is the radial direction, the second waterproof ring 804 is the thrust direction of the lens barrel 1. It is sandwiched between the hood 300 and the motor base 200 in both the radial direction and the hood 300. Therefore, both the second waterproof ring 804 and the external force F1 and the external force F2 are absorbed.

Further, in the lens barrel 1 of the present application, when an external force F2 is applied to the subject side of the screw 802 when an external force is applied to the hood 300, this force counterclockwise the hood 300 with the screw 802 as a fulcrum in FIG. It becomes a force to rotate clockwise. Then, the distance between the reinforcing ring 301 integrated with the hood 300 and the motor base 200 is narrowed. As a result, the waterproof ring 803 located between the reinforcing ring 301 and the motor base 200 is elastically deformed, so that the impact can be absorbed. In addition, the distance between the hood 300 and the operating ring 400 also changes. Therefore, there is a gap in advance between the hood 300 and the operating ring 400.

That is, depending on the external force, the effect of the present invention can be obtained even if only the waterproof ring 803 is configured without using the cushioning material 801 and the second waterproof ring 804 to absorb the impact.

Therefore, the elastic member used to obtain the effect of the present invention may be configured to use one or both of the cushioning material 801 and the second waterproof ring 804 depending on the required impact resistance performance in addition to the waterproof ring 803. ..

From the above, in the present invention, since the ring for dust-proof and drip-proof is also used for shock absorption, no new structure is added. As a result, the lens barrel 1 does not become large.

Further, the first lens group is installed on the hood 300 via the cushioning material 801 and the waterproof ring 803. That is, since the first lens group is supported by the elastic member, it has a structure that is not easily affected by an external force.

The lens barrel of the present invention has a dust-proof and drip-proof function as long as the contact between the first lens retainer 102 constituting the centering group and the protrusion of the waterproof ring 803 does not separate. It is possible to align the center while realizing it.

From the above, the present invention can obtain the effect of the present invention even if the lens moved by the operation ring 400 is a centering group.

1 Lens barrel 100 1st lens 101 1st lens mirror chamber 102 1st lens retainer 103 1st lens group mirror chamber 111 thrust ring 200 motor base 300 hood 301 reinforcement ring 400 operation ring 401 operation ring rubber 500 centering fixed shaft 801 Cushioning material 802 Screw 803 Waterproof ring 804 Second waterproof ring

Claims (6)

A lens barrel in which the optical element placed closest to the subject moves along the optical axis.
With the optical element
A first lens group that holds the optical element and has a first lens frame portion centered on the optical axis of the lens barrel, and a first lens group.
A second mirror frame portion having the optical axis at the center and arranged on the outer periphery of the first mirror frame portion, and a second mirror frame portion.
A third mirror frame portion having the optical axis at the center and arranged on the outer periphery of the second mirror frame portion, and a third mirror frame portion.
It is a lens barrel with
The first mirror frame portion is arranged so as to be relatively movable with respect to the second mirror frame portion along the optical axis.
The first drip-proof rubber is sandwiched between the second mirror frame portion and the third mirror frame portion in the thrust direction.
A lens barrel characterized in that the second mirror frame portion and the third mirror frame portion are screwed in the radial direction. The lens barrel according to claim 1, wherein the first drip-proof rubber is located between the first mirror frame portion and the third mirror frame portion in the radial direction. The lens barrel
It has an operation ring adjacent to the third lens mirror frame on the subject side in the thrust direction.
The lens barrel according to claim 1 or 2, wherein the third lens lens frame portion and the operation ring have a gap. The second mirror frame portion is a fixed cylinder and
The lens barrel according to any one of claims 1 to 3, wherein an elastic member is sandwiched between the second mirror frame portion and the third mirror frame portion in the radial direction. The lens barrel according to claim 4, wherein the elastic member is a second drip-proof rubber sandwiched between the second mirror frame portion and the third mirror frame portion in the thrust direction. The lens barrel according to claim 4 or 5, wherein the elastic member is a cushioning material sandwiched between the screw and the third lens frame portion in the thrust direction.

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