JPH0636043U - Lens hood for wide-angle lens barrel - Google Patents

Abstract

(57) [Abstract] [Purpose] A lens hood that is fixed to the tip of the interchangeable lens barrel, yet has an ideal hood shape with a lens cap and filter that can be easily attached and removed. obtain. [Structure] The lens barrel 10 is provided with a focus ring 13 for focus adjustment and an aperture ring 14 for adjusting an aperture.
The lens hoods 11 and 12 have cam surfaces 11a and 12a in a shape suitable for the optical system of the interchangeable lens. The lens hood 11 is fixed to the lens barrel 10, and the lens hood 12
Is arranged inside the lens hood 11 and is rotatable. The lens hood 12 is moved to the inside of the lens hood 11 by a rotating operation, and the lens cap is attached to and detached from the portion where the lens hood 12 was. It secures the necessary opening and makes it easy to attach and remove the lens cap and filter.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lens hood which is provided at the tip of a taking lens and shields light rays harmful to a taken image.

[0002]

[Prior art]

 A dedicated lens hood is prepared for the interchangeable lens of the single-lens reflex camera. The purpose of the lens hood is to prevent extraneous light from entering from the off-axis when a light ray enters the lens, and a suitable one for each optical system is prepared.

There are various methods of attaching the lens hood to the interchangeable lens. A method of attaching the lens hood to the tip of the interchangeable lens, a method of fixing the lens hood to the tip of the interchangeable lens barrel, and a method of sliding the lens hood There is a method of storing it inside the lens barrel.

Generally, in a telephoto type interchangeable lens, since the lens barrel has a long length, there is room to store the lens hood, and portability is also good, so that the lens hood is slid to be housed inside the lens barrel.

On the other hand, in a wide-angle interchangeable lens, since there is no space for housing the lens hood in the lens barrel, a method of attaching the lens hood to the tip of the interchangeable lens at the time of use is adopted. In addition, the lens hood of the wide-angle interchangeable lens is changed from a circle to a rectangle that is a film shape in order to enhance the hood effect, or a lens hood whose shape is determined according to the incident light flux of a light beam is used. .

[0006]

[Problems to be solved by the device]

 In order to enhance the hood effect, the lens hood of wide-angle interchangeable lenses has a shape that changes from a circle to a rectangle, which is the shape of a film, or a shape that is determined according to the incident light flux of a light beam. If the lens hood was not attached correctly, the lens hood may block the effective light rays and cause vignetting on the image. In particular, when the optical system has an ultra-wide angle, vignetting may occur even with slight misalignment, so a method of fixing the lens hood to the tip of the interchangeable lens barrel is adopted.

However, in the method in which the lens hood is fixed to the tip of the interchangeable lens barrel, when the lens cap or the filter for protecting the lens surface of the interchangeable lens is attached or detached, the lens hood interferes with the lens cap or the lens cap. It was difficult to put on and take off the filter. Therefore, when the inner diameter of the lens hood is unnecessarily increased, or in some cases, as shown in FIG. 4, a part of the hood 41 is cut out, and the notch 42 enables attachment / detachment of the lens cap or filter. Therefore, the hood effect corresponding to the cutout portion 42 may be impaired.

[0008]

[Means for Solving the Problems]

 The present invention has been made in view of the above problems, and the shielding part of the hood is divided into four parts, two parts are paired and fixed to the front end of the interchangeable lens barrel, and the other two parts are paired. By making the tip of the interchangeable lens barrel rotatable, the rotatable hood is rotated when the lens cap is attached or detached, and a part of the hood is cut out to facilitate the attachment / detachment of the lens cap. Also, by rotating the rotatable hood during shooting to reproduce the shape of the lens hood, an ideal lens hood shape can be realized.

[0009]

[Action]

 The hood is divided into four parts, two parts are made into a pair and fixed to the tip of the interchangeable lens barrel, and the other two parts are made into a pair so that they can rotate at the tip of the interchangeable lens barrel. The rotatable lens hood makes it easy to attach and detach the lens cap by notching part of the hood when it is attached and detached. Also, the rotatable lens hood reproduces its shape as a lens hood by rotating during shooting.

[0010]

【Example】

 Hereinafter, the present invention will be described with reference to examples.

FIG. 1 is a perspective view showing a state of an interchangeable lens barrel having a lens hood of the present invention fixed therein at the time of photographing. 10 is a lens barrel, and 11 and 12 are lens hoods. The lens barrel 10 is provided with a focus ring 13 for adjusting the focus and an aperture ring 14 for adjusting the aperture. The lens hoods 11 and 12 have cam surfaces 11a and 12a in a shape suitable for the optical system of the interchangeable lens. Further, the lens hood 11 is fixed to the lens barrel 10, but the lens hood 12 is arranged inside the lens hood 11 and is configured to be rotatable by using a groove and a convex portion (not shown) as guides. ing.

FIG. 2 is a perspective view of the interchangeable lens barrel showing the state of the lens hood when the lens cap is attached and detached. By rotating the lens hood 12, the lens hood 12 is moved to the inside of the lens hood 11, and the opening 15 necessary for attaching and detaching the lens cap can be secured in the portion where the lens hood 12 was.

FIG. 3 is a development view showing the inside of the lens hood 11 and the outside of the lens hood 12. The lens hood 11 is provided with a cam surface 11a, a shielding portion 11b corresponding to the upper and lower sides of the film, and a groove 11c for guiding the lens hood 12 when the lens hood 12 is rotated. The lens 12 is provided with a cam surface 12a, a shielding portion 12b corresponding to the left and right of the film, and a pin 12c corresponding to the groove 11c of the lens hood 11 at the time of rotation.

[0014]

[Effect of device]

 The shield part of the hood is divided into four parts, two parts are made a pair and fixed to the tip part of the interchangeable lens barrel, and the other two parts are made a pair and made rotatable at the tip part of the interchangeable lens barrel. By rotating the rotatable hood when attaching and detaching the lens cap, an opening can be obtained in a part of the hood only when necessary, and the inner diameter of the lens hood is made larger than necessary, or a part of the hood is cut out. The lens hood can be easily attached and detached without any need, and by rotating the hood that can be rotated at the time of shooting, an ideal lens hood shape can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state of an interchangeable lens barrel, to which a lens hood of the present invention is fixed, at the time of photographing.

FIG. 2 is a perspective view of an interchangeable lens barrel showing a state of a lens hood when a lens cap is attached and detached.

3 is a development view showing the inside of a lens hood 11 and the outside of a lens hood 12. FIG.

FIG. 4 is a perspective view showing an interchangeable lens barrel in which a conventional lens hood is fixedly installed.

[Explanation of symbols]

 10 Interchangeable lens barrel 11 Hood 11a Cam surface 11b Shielding part 11c Groove 12 Hood 12a Cam surface 12b Shielding part 12c Pin

Claims (1)

[Scope of utility model registration request] 1. A wide-angle lens barrel in which a lens hood is fixedly attached to a tip portion of the lens hood is divided into four parts,
A lens hood for a wide-angle lens barrel, wherein the pair is rotatable and an opening is provided.