JP3036967U - Lens hood - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to provide a lens hood that can be stored in a very small size, has excellent portability, and can be used for lenses having different apertures and focal lengths. In a lens hood mounted on a taking lens of a camera, an annular air chamber that surrounds the tip of the taking lens and is attached to the tip of the taking lens by injecting air is attached and detached. A lens hood, comprising: a tubular hood portion integrally provided in the annular air chamber for use.

Description

[Detailed description of the invention]

[0001]

【Technical field】

 The present invention relates to a lens hood for a camera.

[0002]

[Prior art and its problems]

 When shooting with a camera, a lens hood is used at the tip of the lens to prevent harmful rays from other than the angle of view of the lens. Usually, the lens hood consists of a mounting part for mounting on the tip of the lens, and a light-shielding part with the tip open to a trumpet type from this mounting part. The shape and length of this light-shielding portion differ depending on the angle of view and focal length of the lens, and in general, the longer the photographic lens is, the larger the size.

The light-shielding portion of the lens hood is made of plastic, for example. While plastics have the advantage of being easy to mold and lightweight, they cannot be stored in a small size when not in use, making it inconvenient to carry with a large lens hood. Therefore, the light shielding portion may be formed of a flexible material such as rubber. However, if it is flexible, it is difficult to maintain a constant shape, and there is a risk that the hood may lose its shape and the hood may interfere within the angle of view. In order to maintain a certain shape, it must be thick, and as a result, it becomes less portable like plastic. Due to these problems, there is a demand for a lens hood with excellent portability that keeps the shape of use with the light-shielding part open when in use and can be stored small when not in use.

Further, the lens hood is equipped with a mounting member for a photographing lens, such as a screw member or a bayonet. For this reason, a screw receiving member and a bayonet which can be engaged with and disengaged from the mounting means on the lens hood side are provided on the photographing lens side of the camera. However, in order to improve the portability of the lens hood, it is desirable to store it as small as possible, and having a screw member or bayonet made of plastic or metal makes the lens hood stable in storage. There is a limit.

In addition, in the screw member and the bayonet system, mountable photographing lenses are limited. Since it is a burden on the photographer to arrange multiple lens hoods according to the shooting lens, a lens hood that can handle lenses with slightly different apertures and focal lengths is desired. Further, in recent years, lens barrels of compact cameras and the like often do not have such mounting means, and even in such a case, a lens hood that can be easily mounted on a taking lens is desired.

[0006]

[Purpose of the invention]

 The present invention has been made in view of the above problems, and an object thereof is to provide a lens hood that can be stored in a small size, has excellent portability, and can be used for lenses having different apertures and focal lengths.

[0007]

[Outline of the invention]

 The lens hood of the present invention is a lens hood that is attached to and detached from a taking lens of a camera, and has a ring shape surrounding the tip of the taking lens, and is a detachable ring that is attached to the tip of the taking lens by injecting air. An air chamber; and a tubular hood portion integrally provided in the detachable annular air chamber; an air amount adjusting means for controlling an expansion amount of the air chamber; As a result, it is not necessary to provide a screw member or the like as a mounting means for the photographing lens, and the storability is improved and the carrying becomes easier.

The hood portion is made of a flexible material, and it is desirable that the hood portion is provided with a hood air chamber that can be expanded and contracted so that the hood portion has a use shape when injecting air. This improves the storability of the hood portion.

In addition, the hood air chamber may include a plurality of trunk-shaped air chambers extending in the generatrix direction of the tubular hood portion. This trunk-like air chamber may be in communication with the detachable annular air chamber or may not be in communication therewith. If they are in communication with each other, it is possible to use only one air amount adjusting means, which facilitates the operation. With no communication, the amount of expansion of the removable annular air chamber can be finely adjusted without changing the amount of air in the trunk air chamber to adjust the mounting state of the taking lens.

It is preferable that the tubular hood portion is a tubular conical body whose diameter increases from the side of the removable annular air chamber to its tip.

The detachable annular air chamber is provided on one end surface of the tubular hood portion coaxially with the hood portion, and has an inner peripheral opening surface that is elastically brought into close contact with the outer peripheral surface of the taking lens barrel by expansion. have. This detachable annular air chamber can be attached to a taking lens having a different aperture according to changes in its elasticity and expansion amount. Further, the mounting position of the detachable annular air chamber can be moved in the optical axis direction of the photographing lens.

The lens hood of the present invention is also a lens hood mounted on a taking lens of a camera, which is formed of a flexible sheet-shaped material and expands into a cylindrical light-shielding shape. A chamber; an air amount adjusting means for controlling the expansion amount of the cylindrical air chamber; an inner peripheral opening surface which is provided coaxially with the cylindrical air chamber and is provided separately from the cylindrical air chamber, and which is expanded and held in close contact with the photographing lens barrel. An annular air chamber for attachment / detachment; and an air amount adjusting means for controlling an expansion amount of the annular air chamber for attachment / detachment.

[0013]

[Embodiment of the invention]

 Hereinafter, the present invention will be described with reference to the drawings. 1 to 4 show an embodiment of a lens hood 10 according to the present invention. As shown in FIGS. 1 to 4, the lens hood 10 has a substantially conical hood portion 12 and an air chamber 11 formed along the outer surface of the hood portion 12.

The hood portion 12 is made of a material having flexibility and light shielding property, for example, vinyl chloride. The hood portion 12 can be folded in a flat shape, and when tension is applied, the hood portion 12 becomes a partial conical shape having circular opening surfaces at both ends. The hood portion 12 has a circular large opening surface 12a on the bottom side of the cone, and a small opening surface 12b coaxial with the large opening surface 12a is formed on the apex side. The large aperture surface 12a and the small aperture surface 12b are parallel surfaces, and the aperture diameter, the distance between the aperture diameters 12a and 12b, etc. are determined according to the imaging lens of the camera described later.

An annular air chamber 14 is provided around the small opening surface 12b. The annular air chamber 14 has a substantially circular mounting and holding surface 14a that is concentric with the small opening surface 12b of the hood portion 12, and is crimped and fixed to the hood portion 12 to prevent light leakage. From this annular air chamber 14, four trunk-like air chambers 16 are extended at substantially equal intervals in the direction of the large opening surface 12a. The trunk-shaped air chamber 16 is crimped to the outer surface of the hood portion 12 having a substantially conical shape, so that its extending direction is enlarged by a predetermined amount with respect to the generatrix of the hood portion 12, and the tip is widened. .

The annular air chamber 14 and each of the trunk-like air chambers 16 are integrally formed of a material having flexibility and airtightness, for example, vinyl or rubber to form the air chamber 11. In this air chamber 11, air can be communicated freely. An air inlet 18 is provided in one of the trunk-like air chambers 16 as a means for injecting air into the air chamber 11 and discharging air. This air inlet 18 is a well-known one used for a floating ring, a rubber boat, etc., and it is possible to inflate the annular air chamber 14 and the trunk-like air chamber 16 by using human exhalation or a compressor.

1 to 4 show a state where the air chamber 11 is inflated. When the annular air chamber 14 is inflated into a substantially annular shape, the small opening surface 12b of the hood portion 12 that is crimped thereto is expanded into a substantially circular shape. At the same time, when the four trunk-like air chambers 16 are inflated and expanded, tension is applied to the outer peripheral surface of the hood portion 12 that is crimped thereto, and the large opening surface 12a is held in a substantially circular shape. . Therefore, the lens hood 10 can be used with the hood portion 12 expanding in a partial conical shape. The hood portion 12 and the air chamber 11 themselves do not have the rigidity to maintain this light shielding shape, but the light shielding shape is maintained by the air pressure in the air chamber 11.

On the contrary, when the cap of the air inlet 18 is opened to discharge the air, the air chamber 11 is compressed. When the air chamber 11 is contracted, the tension on the hood portion 12 is released, so that the hood portion 12 can be folded into a flat shape. Further, since the air chamber 11 itself is also flexible, it can be folded when the air inside is released.

FIG. 5 is a plan view of the camera 30 to which the lens hood 10 is attached. This camera 30 is a camera whose lenses can be exchanged, and a lens mount (not shown) is formed on the front surface of the camera body 31, and the base end side of the taking lens 32 is engaged with and disengaged from the lens mount. 32 can be exchanged. The taking lens 32 has a substantially cylindrical shape, and its outer peripheral surface is formed smoothly. 5 and 6, reference numeral 35 is a release button, and 36 is a liquid crystal display for displaying photographing data and the like.

FIG. 6 shows a state in which the lens hood 10 is attached to the camera 30. To attach the lens hood 10 to the camera 30, first, air is introduced from the air inlet 18 to expand the air chamber 11 by a predetermined amount. The opening diameter of the mounting holding surface 14a of the annular air chamber 14 is formed so as to be substantially the same as the outer diameter of the cylindrical photographing lens 32. When the tip of the photographing lens 32 is inserted into this mounting holding surface 14a. The lens hood 10 can be attached to the taking lens 32. At this time, the mounting holding surface 14a is brought into close contact with the outer peripheral surface of the taking lens 32 by the elasticity of the annular air chamber 14, so that the mounting stability is maintained and there is no risk of light leakage.

The lens hood 10 has a ring-shaped air chamber 14 that is a mounting portion and has elasticity, and can further change the amount of expansion, so that it can be used as a photographic lens having a different aperture from the photographic lens 32. Can be used. For example, a photographing lens having a slightly larger aperture can be mounted by elastic deformation of the annular air chamber 14. In the case of a lens having a larger diameter, it can be inserted by reducing the expansion amount of the annular air chamber 14 to the extent that the hood portion 12 does not sag. On the other hand, in the case of a photographic lens having a small aperture, the amount of air in the annular air chamber 14 is made larger than usual to fit the lens barrel.

As described above, the lens hood 10 can be attached to a plurality of photographing lenses, but the size of the hood portion 12 is constant. Therefore, if the mounting position in the optical axis direction cannot be changed, there arises a disadvantage that the light shielding unit 20 becomes too long or too short when mounted on lenses having different focal lengths. For example, vignetting occurs when the light-shielding portion is too long compared to the focal length, and conversely, when the light-shielding portion is too short, the required light-shielding effect cannot be obtained. Since the lens hood 10 of the present invention is a system in which the lens barrel is held by the annular air chamber 14 having elasticity, if the outer peripheral surface of the lens barrel has a substantially cylindrical shape, its position in the optical axis direction is selected. Can be installed without. Therefore, by moving the mounting position of the annular air chamber 14 to an appropriate position in the optical axis direction according to the taking lens, a good light-shielding effect can be obtained even with taking lenses having different focal lengths.

When the use of the lens hood 10 is finished, the annular air chamber 14 is pulled out from the taking lens 32 and the lens hood 10 is removed. Then, the air inlet 18 is opened and the air in the air chamber 11 is discharged. When the air is discharged, the tension in the air chamber 11 is removed, so that the flexible hood portion 12 can be folded. Furthermore, when the amount of air remaining in the air chamber 11 is low, the air chamber 11 is flattened by crushing it with a hand or the like.

The lens hood 10 is lightweight because it is made of vinyl or rubber. In addition, as described above, it can be made into a flat shape and can be assembled very compactly, so that it can be carried easily. Moreover, since it is flexible as a whole and there is no risk of damage, it can be used without losing its shape because tension is applied by the injected air pressure.

In this embodiment, the annular air chamber 14 and the trunk-like air chamber 16 are communicated with each other, but they may not be communicated with each other. If both air chambers are in communication, it is possible to use only one air inlet, which simplifies the adjustment operation. In the case of non-communication, the expansion amount of the detachable annular air chamber can be changed without changing the air amount of the trunk air chamber, so that the mounting state of the taking lens can be finely adjusted. In case of non-communication, an air inlet is required for each air chamber.

FIG. 7 shows a different form of the present invention. The lens hood 40 is composed of a conical air chamber 42 and an annular air chamber 44 which is a separate body from the air chamber 42. Air inlets 43 and 45 are provided in each air chamber, and the expansion amount can be adjusted individually. The conical air chamber 42 has the functions of the hood portion 12 and the trunk-like air chamber 16 of the lens hood 10. When air is injected from the air inlet 43, the conical air chamber 42 has a substantially conical shape as shown in FIG. Is expanded. In this expanded state, the conical air chamber 42 blocks harmful rays outside the angle of view, and the shape is maintained by the air pressure inside. The annular air chamber 44 is pressure-bonded to the end surface of the conical air chamber 42, and the amount of expansion can be changed by injecting air from the air inlet 45. By adjusting the expansion amount, the attachment holding surface 46 of the annular air chamber 44 can be fitted to the outer peripheral surface of the taking lens, and can be attached to the taking lenses having different apertures. Also, the mounting position of the shooting lens can be moved in the optical axis direction. The lens hood 40 has a conical air chamber 42 at the hood portion, so that the configuration is simple. In addition, since the annular air chamber 44 is provided separately, the amount of air in the annular air chamber 44 can be adjusted without changing the air pressure acting on the light shielding portion, that is, the shape of the conical air chamber 42.

The present invention can be applied to modes other than the above embodiment. For example, operability can be improved by attaching a small-sized manual pump with a check valve to each air chamber as an air injecting means. Further, the shape of the hood portion may be any shape that is most effective as a hood, such as a petal shape or a prismatic shape, other than the conical shape.

[0028]

[Effect of the invention]

 As described above, according to the present invention, it is possible to obtain a lens hood that can be stored in a very small size, has excellent portability, and can be used for lenses having different apertures and focal lengths.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a lens hood according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a rear view of FIG. 1;

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a plan view showing an example of an interchangeable lens type camera to which the lens hood of the present invention is attached.

6 is a plan view of the camera of FIG. 5 with a lens hood attached.

FIG. 7 is a cross-sectional view showing a different embodiment of the present invention.

[Explanation of symbols]

 10 40 Lens Hood 11 Air Chamber 12 Hood 12a Large Opening Surface 12b Small Opening Surface 14 Annular Air Chamber (Integrated) 16 Trunk Air Chamber 18 Air Inlet 30 Camera 32 Photo Lens 42 Cone Air Chamber 44 Annular Air Chamber (Separate type)

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[Procedure amendment]

[Submission date] December 11, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 2

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 3

[Correction method] Change

[Correction contents]

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] Claim 4

[Correction method] Change

[Correction contents]

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] Claim 5

[Correction method] Change

[Correction contents]

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] Claim 6

[Correction method] Change

[Correction contents]

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] Claim 7

[Correction method] Change

[Correction contents]

[Procedure amendment 7]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 8

[Correction method] Change

[Correction contents]

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] Claim 9

[Correction method] Change

[Correction contents]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kazuki Yazawa 2-36-9 Maeno-cho, Itabashi-ku, Tokyo Asahi Kogaku Kogyo Co., Ltd. (72) Toshiyuki Omori 2-36-9 Maeno-cho, Itabashi-ku, Tokyo Issue Asahi Kogaku Kogyo Co., Ltd. (72) Inventor Fuji ▲ Saki ▼ Yoshifumi 2-36 Maeno-cho, Itabashi-ku, Tokyo Inside Asahi Kogaku Kogyo Co., Ltd. (72) Ayako Nakamura 2-chome Maeno-cho, Itabashi-ku, Tokyo No. 36-9 Asahi Kogaku Industry Co., Ltd.

Claims (10)

[Utility model registration claims] 1. A lens hood mounted on a taking lens of a camera, which has an annular shape surrounding a front end of the taking lens, and is attached and detached to a front end of the taking lens by injecting air. A lens hood, comprising: a tubular hood portion integrally provided in a detachable annular air chamber. 2. The lens according to claim 1, wherein the hood portion is made of a flexible material, and the hood portion is provided with a hood air chamber capable of expanding and contracting to make the hood portion a use shape when injecting air. hood. 3. The air chamber for a hood according to claim 2,
A lens hood having a plurality of trunk-like air chambers extending in the generatrix direction of a tubular hood portion. 4. The lens hood according to claim 3, wherein the detachable annular air chamber communicates with the trunk-like air chamber. 5. The lens hood according to claim 3, wherein the removable annular air chamber is not in communication with the trunk air chamber. 6. The lens hood according to claim 1, wherein the tubular hood portion has a tubular conical body whose diameter increases from the detachable annular air chamber side to the tip. 7. The detachable annular air chamber according to claim 1, wherein the detachable annular air chamber is provided coaxially with the hood portion on one end surface of the tubular hood portion, and elastically attached to the outer peripheral surface of the taking lens barrel by expansion. A lens hood that has an open inner peripheral surface. 8. The lens hood according to claim 1, wherein the detachable annular air chamber is attachable to a taking lens having a different aperture depending on a change in elasticity and an expansion amount of the detachable annular air chamber. 9. The lens hood according to claim 1, wherein the attachment / detachment annular air chamber is movable in a mounting position in the optical axis direction of the taking lens. 10. A lens hood mounted on a taking lens of a camera, the cylindrical air chamber being formed of a flexible sheet-shaped material and expanding to form a cylindrical light-shielding shape; An air amount adjusting means for controlling the expansion amount of the chamber; a detachable annular air chamber which is provided coaxially with the tubular air chamber and is provided separately from the tubular air chamber, and which has an inner peripheral opening surface that is inflated and closely held by the photographing lens barrel. And an air amount adjusting means for controlling an expansion amount of the detachable annular air chamber;