JPH0655139U - Lens hood mounting device - Google Patents

Abstract

(57) [Summary] [Purpose] By notching a part of the bayonet claw, and fixing an elastic member wider than the width of the claw in the notch,
All shooting lenses and lens hoods are securely fixed to improve operability of attachment and detachment. [Structure] The bayonet claws 20 are evenly arranged at three locations on the inner circumference of the lens hood 2, and a cutout 21 is provided in a part of the bayonet claw 20, and the circular silicon rubber 10 is screwed into the cutout 21. Fixed by 11. Shooting lens 1
A concave groove portion 31 corresponding to the bayonet claw portion 20 of the lens hood 2 is formed by the lens side claw portion 30, and is provided at three locations on the outer periphery of the distal end of the photographing lens 1 corresponding to the bayonet claw portion 20.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lens barrel for photographing and a lens hood mounting device thereof, and more particularly to a structure of a fitting portion of the lens hood and lens lens barrel mounting device.

[0002]

[Prior art]

 Conventionally, the lens hood mounting device for photography has been a screw-in type that uses the filter screw of the lens barrel, a spring type that uses a spring or the like to pull the filter screw of the lens barrel, and a claw on the lens hood and lens barrel. There is a bayonet type with a concave groove and a built-in type with a lens hood built into the lens barrel.A suitable size is attached according to the size and angle of view of the taking lens by the above method. I'm using it.

Further, as prior art examples of a lens hood mounting device, there are Japanese Patent Laid-Open Nos. 61-67841, 62-234139, 48-53357, 48-75637, 48-4837. No. 75638, Syokai 48-75640, and the like. Japanese Patent Laid-Open Nos. 61-67841 and 48-75638 try to fix the lens hood with a magnet, and Japanese Patent Laid-Open No. 62-234139 has two arms. A claw is provided on the part to attach the photographing lens by the claw.

[0004]

[Problems to be solved by the device]

 When using a lens hood as a shooting lens, the large photographic lens called super-telephoto, as well as the lens itself, also becomes larger. For this reason, if the lens hood is built into the lens, the weight and size of the lens itself increase, and it is not only difficult to attach / detach with a screw-in type when the detachable lens hood is used, but also it cannot be attached / detached even with a slight deformation. The conventional bayonet type cannot be securely fixed to the lens body, and even if it is slightly deformed it cannot be attached or detached. Even with the spring type, the lens hood itself is heavy and easily falls, and there is the problem that the lens itself may be deformed if a set screw is attached, or the lens hood cannot be attached and removed smoothly.

Further, even in the above-mentioned method using a magnet, in order to fix a large lens hood, it is necessary to make the magnetic force large, and there is a recent automatic control photographing lens in which an IC is incorporated. , The IC could be damaged by the magnet, and there was a limit to its use. Further, the method of fixing the lens hood with the claws of the arm portion is not applicable to all photographing lenses, such as the problem that the claws are damaged or the operability is deteriorated when the lens hood is enlarged.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the present invention, the fixing means for the lens body and the lens hood is a bayonet type having a claw and a groove corresponding to the claw, and at least one part of the bayonet claw is cut out. The problem was solved by fixing an elastic member wider than the width of the bayonet claw in the notch.

[0007]

[Action]

 At least one part of the bayonet claw is cut out, and the elastic member fixed to the notch with screws or caulking pins fits into the groove corresponding to the bayonet claw, and the elastic force of the elastic member causes the groove to form. The lens hood is pressed down from the inside to firmly fix it, and the operability of attachment / detachment can be improved.

[0008]

【Example】

 Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings by applying it to a removable lens hood.

FIG. 1 is an exploded perspective view showing a mounting device for a detachable lens hood.

Reference numeral 1 is a photographing lens, and 2 is a lens hood. The bayonet claw portion 20 that is the mounting portion of the lens hood 2 is configured with a notch portion 21, and the bayonet claw portions 20 are evenly arranged at three locations on the inner circumference of the lens hood 2. Then, the circular silicon rubber 10, which is an elastic member, is fixed to the notch 21 by the screw 11.

On the other hand, a concave groove portion 31 corresponding to the bayonet claw portion 20 of the lens hood 2 is formed on the photographing lens 1 by the lens side claw portion 30 and corresponds to the bayonet claw portion 20 on the outer periphery of the tip of the photographing lens 1. And there are three places.

FIG. 2 is a front view of the lens hood 2 viewed from the photographing lens side.

As shown in the figure, the circular silicone rubber 10 is fixed to the notch 21. The notch 21 is notched so as to have a width similar to the diameter of the circular silicon rubber 10 so that no gap is formed between the notch 21 and the circular silicon rubber 10.

FIG. 3 is a view of the lens hood 2 shown in FIG.

The relationship between the positions and sizes of the circular silicon rubber 10, the screw 11 and the bayonet claw portion 20 is as shown in FIG. 3, the screw 11 is smaller than the claw width of the bayonet claw portion 20, and the circular silicon rubber 10 is a bayonet. It is larger than the claw width of the claw portion 20. The relationship between the outer diameter of the circular silicon rubber 10 and the groove width of the concave groove portion 31 of the photographing lens 1 is such that the outer diameter of the circular silicon rubber 10 is larger than the groove width of the concave groove portion 31.

Next, the operation when the lens hood 2 of the mounting device of the present invention is mounted on the photographing lens 1 will be described with reference to FIG.

First, the bayonet claw portion 20 of the lens hood 2 enters the concave groove portion 31 formed by the lens side claw portion 30 of the photographing lens 1, and subsequently, the circular silicone rubber 10 enters the concave groove portion 31. Since the outer diameter of the circular silicon rubber 10 is larger than that of the concave groove portion 31, elasticity, which is one of the features of the circular silicon rubber 10, works, and the concave groove portion 31 is pressed from the inside, which cannot be obtained by the conventional bayonet type. It is surely worn while feeling.

Although the embodiment has been described in detail by applying it to the detachable lens hood, in addition to this embodiment, the number of notches is changed, and the elastic member is elastic other than circular silicon rubber. The same effect can be obtained if it is a substance. Further, the mounting device of the present invention is not limited to the detachable lens hood, and the mounting device such as fixing the built-in lens hood with the lens hood built into the lens barrel, fixing the lens hood and the extension lens hood, etc. It goes without saying that there are various methods of manufacturing products using the purpose of the idea.

[Effect of device]

 The mounting device of the present invention is more effective for attaching and detaching the lens hood of a large-sized shooting lens called super telephoto due to the above-mentioned configuration, solves the above-mentioned problems, and further, for all kinds of shooting There is no problem even if it is used as a lens, the shooting lens body and the lens hood can be securely fixed, and it is smooth and easy to attach and detach with a good wearing feeling that has never existed before.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a mounting device of the present invention.

FIG. 2 is a front view of the lens hood as seen from the taking lens side.

3 is a view on arrow A of the lens hood shown in FIG. 2. FIG.

[Explanation of symbols]

 1 Lens for photographing 2 Lens hood 10 Circular silicone rubber 20 Bayonet claw part 31 Recessed groove part

Claims (1)

[Scope of utility model registration request] 1. A detachable lens hood to be mounted on a photographing lens, wherein a fixing means for the lens body and the lens hood comprises a claw portion and a concave groove portion corresponding to the claw portion. A lens hood mounting device characterized in that at least one of the portions is notched, and an elastic member wider than the width of the claw portion is fixedly provided in the notch.