JPH055825A - Lens barrel structure - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents external light from entering through the bonding gap that occurs when the inner circumference of the rubber ring and the band-shaped member are bonded together, and also causes the lens-barrel cover and the belt-shaped member to be generated when the lens-barrel cover is tilted. An object of the present invention is to provide a lens barrel structure that can prevent external light from entering through a gap between members and the like. [Structure] When the lens barrel cover moves straight inside the straight-moving barrel, an extension part of one of the flanges of the rubber ring that extends in the inner diameter bends in the direction of travel of the cylindrical surface of the lens-barrel cover and closely contacts the cylindrical surface. It is supposed to do. [Effect] External light is prevented from entering during shooting and non-shooting, and careless exposure of the film is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel structure, and more particularly to a function of preventing light leakage of the lens barrel structure.

[0002]

2. Description of the Related Art Conventionally, in a lens barrel structure of a camera for zooming, for example, as shown in FIG.
Is provided with a lens barrel cover c that goes straight inside the straight-moving barrel d, and a rubber ring a having flanges at both ends to an inner circumferential groove at one end of the straight-moving barrel d, and a groove between the flanges of the rubber ring a. It is a structure in which the fibrous band-shaped member b is arranged by using the adhesive tape e having elasticity.

[0003]

However, the conventional lens barrel structure shown in FIG. 4 has the following problems.

First, a fibrous band member (suede) b
When fixing to the inner circumference of the rubber ring a, since the uniformity of the fluff is significantly impaired in the integrated configuration of flocking etc., it is formed on the belt-shaped member b and the elastic double-sided adhesive is formed on the inner circumference of the rubber ring a. The method of adhering with the tape e was implemented.

However, both ends of the belt-shaped member b are connected to the rubber ring a.
In order to prevent the overlap on the inner circumference of the, it is necessary to provide a certain gap. However, the incident light path indicated by the dotted arrow A is established in the gap between the strip-shaped members b, and external light reaches the film surface (not shown) from the aperture, and the photograph is considerably blurred at the time of shooting. Further, even when the image is not taken, a part of the film may be exposed due to the incident of external light.

Secondly, when the lens barrel cover c is maintained in the telephoto state, as shown in FIGS. 5 and 6, due to the structure of the lens barrel, the lens barrel cover c is affected by an external force f. Of the three rollers g, two are tilted with respect to two fulcrums, and a gap β is generated between the lens barrel cover c and the belt-shaped member b, so that an incident light path for outside light is established even when not shooting. Then, a part of the film may be exposed.

The present invention is intended to solve the above problems. That is, the present invention prevents the incidence of external light from the bonding gap that occurs when the rubber ring inner periphery and the band-shaped member are bonded together, and the lens barrel cover that is generated when the lens barrel cover is intentionally tilted by an external force. It is an object of the present invention to provide a lens barrel structure capable of preventing external light from entering through a gap such as a band-shaped member.

[0008]

In order to achieve the above object, a lens barrel structure of the present invention has a lens barrel cover which is straight inside a straight barrel and one end of the straight barrel. A rubber ring having flanges at both ends is arranged in the circumferential groove, and
In the groove between the flanges of the rubber ring, an easily deformable member that is in pressure contact with the cylindrical surface of the lens barrel cover is arranged, and when the lens barrel cover moves straight inside the straight-moving barrel, An extended portion obtained by extending one of the flanges in the inner diameter direction is bent in the traveling direction of the cylindrical surface of the lens barrel cover so as to come into close contact with the cylindrical surface.

[0009]

According to the present invention, since one of the flanges of the rubber ring has an extended portion extending in the inner diameter direction and is in close contact with the cylindrical surface of the lens barrel cover, the inner periphery of the rubber ring and the fibrous band-shaped member are External light is prevented from entering through the bonding gap that occurs during bonding, and the external light is prevented from entering through the gap between the lens barrel cover and the belt-shaped member when the lens barrel cover is intentionally tilted by external pressure. Can be prevented.

[0010]

【Example】

(First Embodiment) FIG. 1 is a partially cutaway enlarged sectional view showing a first embodiment of the present invention, and FIG. 2 is an overall sectional view thereof.

In FIGS. 1 and 2, 1 is a straight-moving barrel, 2
Is a rubber ring, 3 is a lens barrel cover, and 4 is a fibrous band-shaped member (suede).

That is, the rectilinear barrel 1 has a roller groove for advancing the lens barrel cover 3 and a groove for holding the rubber ring 2 with a certain amount of rattling.

The rubber ring 2 has a flange extension 2a which is in close contact with the lens barrel cover 3, and is made of, for example, silicone rubber.

In the lens barrel cover 3, the flange extension 2a of the rubber ring 2 and the belt-shaped member 4 slide.

Then, the rubber ring 2 and the belt-shaped member 4 are bonded by a double-sided adhesive tape 5 having elasticity and unitized.

When the barrel cover 3 is inserted into this unitized rubber ring 2, the band-shaped member 4 and the rubber ring 2 are charged by a certain amount due to the difference in inner diameter, and at the same time, the outer diameter of the rubber ring 2 is also expanded by a certain amount. Then, the amount by which the rubber ring 2 is fitted in the straight advancement cylinder 1 is determined. Further, the entire circumference of the flange extension portion 2a of the rubber ring 2 is bent in the insertion direction by the insertion of the lens barrel cover 3.

A camera-side switch (not shown) causes the lens-barrel cover 3 to move straight, and a certain amount of friction is generated between the curved contact surface of the flange extension 2a and the cylindrical surface of the lens-barrel cover 3. At the same time, when the lens barrel cover 3 moves straight, a certain amount of friction is generated between the lens barrel cover 3 and the belt-shaped member 4 pressed against the cylindrical surface of the lens barrel cover 3 due to the elastic force of the rubber ring 2. Due to the former friction, the entire circumference of the flange extension portion 2a is bent in the traveling direction of the lens barrel cover 3. Further, if the traveling direction of the lens barrel cover 3 is reversed, the bending of the entire flange extending portion 2a is reversed.

The close contact with the cylindrical surface of the lens barrel cover 3 due to the bending of the flange extending portion 2a causes the rubber ring 2 shown in FIG.
This prevents external light from entering through the bonding gap α of the belt-shaped member 4 that occurs when the belt-shaped member 4 is bonded and assembled, and prevents unnecessary exposure of external light that does not pass through the lens to the film surface during shooting.

Further, at the time of non-photographing, a gap (β in FIGS. 5 and 6) between the lens barrel cover 3 and the cylindrical surface and the rubber ring 2 which occurs when the lens barrel cover 3 is intentionally tilted by the pressure from the outside. The change in the bending of the flange extension 2a in accordance with the tilt of the lens barrel cover 3 prevents the outside light from entering through the gap β, and prevents the unnecessary exposure of the outside light that does not pass through the lens to the film surface.

Next, some embodiments of the present invention will be described.

(Second Embodiment) The flange extension portion 2a of the rubber ring 2 shown in the first embodiment is arranged not on the front side of the camera,
Installed on the rear side of the camera. Even in this case, the same effect as that of the first embodiment can be obtained.

(Third Embodiment) The flange extension portion 2a of the rubber ring 2 shown in the first embodiment is provided partially or partially symmetrically instead of the entire circumference, and is equivalent to the first embodiment. To achieve the desired effect.

(Fourth Embodiment) The flange extending portions 2a of the rubber ring 2 shown in the first embodiment are provided at both ends of the rubber ring on the front side of the camera and the rear side of the camera to obtain better effect. To

(Fifth Embodiment) Rubber ring 2 of the fourth embodiment
The shape is adopted, and the fibrous band-like member adhered to the rubber ring 2 is eliminated to obtain the same effect as that of the first embodiment.

(Sixth Embodiment) The material of the rubber ring 2 shown in the first embodiment is changed from a silicon material to another rubber material in terms of cost so as to obtain the same effect as that of the first embodiment. To

(Seventh Embodiment) The material of the fibrous belt-shaped member 4 shown in the first embodiment is functionally different from suede (polyester fiber) to another special fiber having a spring property or a chemical-free special fiber. The material is changed to a synthetic material so as to obtain the same effect as that of the first embodiment.

(Eighth Embodiment) The rubber ring 2 and the belt-shaped member 4 shown in the first embodiment are integrated without being bonded by the adhesive tape 5, and the same effect as that of the first embodiment is obtained. To get it.

[0028]

As described above, according to the present invention,
Since one of the flanges of the rubber ring has an extension portion that extends in the inner diameter direction and is in close contact with the cylindrical surface of the lens barrel cover, the rubber ring inner circumference and the cylindrical surface of the lens barrel cover can be easily deformed by pressure. External light is prevented from entering through a bonding gap generated at the time of bonding with a belt-shaped member or the like as a member, and the lens-barrel cover and the belt-shaped member which are generated when the lens-barrel cover is intentionally collapsed by external pressure It is possible to prevent external light from entering through the gap. Therefore, the incidence of external light is prevented during shooting and non-shooting, and careless exposure of the film is prevented.

[Brief description of drawings]

FIG. 1 is a partially cutaway enlarged cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the entire lens barrel structure of FIG.

FIG. 3 is a perspective view showing a rubber ring and a belt-shaped member of FIG.

FIG. 4 is a partially cutaway enlarged sectional view showing an example of a conventional technique.

FIG. 5 is a cross-sectional view showing a state in which a lens barrel cover is tilted down.

FIG. 6 is a front view of FIG.

[Explanation of symbols]

 1: Straight advance cylinder 2: Rubber ring 2a: Flange extension part 3: Lens barrel cover 4: Band-shaped member 5: Double-sided adhesive tape

Claims (1)

Claim: What is claimed is: 1. A straight barrel includes a lens barrel cover that straightly travels inside the straight barrel, and a rubber ring having flanges at both ends to an inner circumferential groove of one end of the straight barrel. In addition, a member that is easily deformed and is brought into pressure contact with the cylindrical surface of the lens barrel cover is disposed in the groove between the flanges of the rubber ring, and when the lens barrel cover moves straight inside the straight-moving barrel, the rubber A lens barrel structure, characterized in that an extension portion obtained by extending one of the flanges of the ring in an inner diameter direction is bent in a traveling direction of a cylindrical surface of the barrel cover so as to be in close contact with the cylindrical surface.