JP2006145955A - Lens hood and light shielding part adjustment member for the lens hood - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens hood free from vignetting or the like even when attached to a camera that has a different imaging area, and to provide a light shielding part adjustment member for the lens hood. <P>SOLUTION: A lens hood 3 is attached to an exchangeable lens 2 attachable to a digital single-lens reflex camera 1 or a film single-lens reflex camera 11. For photographing with the digital single-lens reflex camera 1, a small-diameter ring 5 is attached to the digital single-lens reflex camera 1. For photographing with the film single-lens reflex camera 11, a small-diameter ring 5 is detached from the film single-lens reflex camera 11. According to the imaging area of each camera, light rays entering the lens from outside a view angle are shaded. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lens hood attached to an interchangeable lens that can be attached to a plurality of cameras having different imaging areas, and a light-shielding part adjusting member attached to the lens hood.

Conventionally, a single-lens reflex camera is generally one that takes a picture with a film loaded, but recently, a digital single-lens reflex camera that forms an image on an electronic image sensor such as a CCD (charge coupled device) is becoming widespread. .
A film generally used in a single-lens reflex camera for film is called a 135 format, and an imaging area is 24 mm long and 36 mm wide. On the other hand, the image pickup area of an electronic image pickup device such as a CCD used in a digital single-lens reflex camera is generally smaller than a 135 format length of 24 mm and a width of 36 mm from the balance of semiconductor manufacturing equipment and manufacturing costs.
A single-lens reflex camera is characterized by the fact that the lens can be exchanged, but the interchangeable lens can also be used for a single-lens reflex camera for film by sharing the mount for mounting the lens between the single-lens reflex camera for film and the digital single-lens reflex camera. Compatible with digital SLR cameras.

Consider a lens hood attached to such an interchangeable lens. The lens hood is a photographing device that blocks light from outside the angle of view and prevents it from entering the lens. By attaching the lens hood to the subject side tip of the interchangeable lens, flare, stray light, etc. in the lens barrel can be reduced.
As described above, the image pickup area of the electronic image sensor is smaller than the 135 format image pickup area, so the lens hood that matches the image pickup area of the film single-lens reflex camera is attached to the digital single-lens reflex camera. In some cases, the light blocking effect of light rays outside the angle of view is not sufficient. On the contrary, when the lens hood of a digital single-lens reflex camera is mounted on a single-lens reflex camera for film, so-called vignetting may occur in which the four corners of the captured image are not reflected.
For this reason, when a single lens is replaced with a single-lens reflex camera for a film or a digital single-lens reflex camera according to the shooting situation, it is necessary to prepare a lens hood for film shooting and a lens hood for digital shooting. It was. Further, it is necessary to replace the lens hood at the same time as exchanging the lenses, and there is a problem that the operation becomes complicated. Furthermore, it is bulky as a photographic equipment and is not preferable for movement during photographing.

On the other hand, there is a lens hood that has an extension hood on the main hood, and changes the overall length of the hood according to changes in the focal length of the zoom lens, etc., thereby limiting the incidence of light that interferes with shooting on the lens. (For example, Patent Document 1). However, the purpose of this lens hood is to block the light incident on the lens according to the focal length of the photographic optical system, so it is not possible to block the light incident on the lens according to the imaging area of the camera. Can not.
Japanese Utility Model Publication No. 6-47934

  An object of the present invention is to provide a lens hood that does not cause vignetting and the like, and a light shielding portion adjusting member for the lens hood, even when mounted on cameras having different imaging areas.

The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to the Example of this invention is attached | subjected and demonstrated, it is not limited to this.
The invention of claim 1 is a camera (11) having a first imaging area (11e) and a camera (1) having a second imaging area (1e) narrower than the first imaging area (11e). A lens hood (3) provided at the subject-side tip of the interchangeable lens (2) that can be attached to the lens, and the rays incident on the interchangeable lens (2) correspond to the first imaging area (11e). A hood body (4) having a first light-shielding portion (4b, 4c) for shielding light, and a light beam incident on the interchangeable lens (2), which is detachably provided at the subject-side tip of the hood body (4), The lens hood includes a light shielding part adjusting member (5) having a second light shielding part (5b) that shields light corresponding to the second imaging area (1e).

  The invention of claim 2 is a camera (11) having a first imaging area (11e) and a camera (1) having a second imaging area (1e) narrower than the first imaging area (11e). The first light-shielding portion (1) that is provided at the subject-side tip of the interchangeable lens (2) that can be attached to the first lens and shields light incident on the interchangeable lens (2) corresponding to the first imaging area (11e). 4b, 4c) a light shielding part adjusting member (5) of a lens hood (3), an annular main body (5a) detachably provided at a subject-side tip of the lens hood (3), and the annular main body A lens hood having a second light shielding portion (5b) formed inside (5a) and shielding light incident on the interchangeable lens (2) corresponding to the second imaging area (1e). It is a light-shielding part adjustment member of (3).

  The lens hood of the present invention is provided at the subject-side tip of an interchangeable lens that can be attached to a camera having a first imaging area and a camera having a second imaging area that is narrower than the first imaging area. Of the light rays incident on the interchangeable lens, the hood main body has a first light shielding portion corresponding to the first imaging area, and the light shielding portion adjustment member is detachably provided at the subject-side tip of the hood main body. A second light-shielding portion corresponding to two imaging areas. For this reason, an interchangeable lens can be attached to the camera having the first imaging area and the camera having the second imaging area, and light can be shielded corresponding to each imaging area. That is, the lens hood of the present invention can improve the image quality of the camera by blocking light rays incident on the lens from outside the angle of view, corresponding to two cameras having different imaging areas. Further, when the interchangeable lens is replaced with a camera having a different imaging area at the time of shooting, the lens replacement does not become complicated. In addition, it can be compactly packed without making the photographic equipment bulky.

  An object of the present invention is to provide a lens hood that does not cause vignetting or the like, and a light shielding portion adjusting member for the lens hood, even when attached to cameras having different imaging areas. Attach a lens hood to an interchangeable lens that can be attached to a reflex camera, attach a small diameter ring when shooting with a digital single lens reflex camera, and remove a small diameter ring from the hood body when shooting with a single lens reflex camera for film, This was realized by blocking the light incident on the lens from outside the angle of view according to each imaging area.

Hereinafter, the present invention will be described in more detail with reference to the drawings and the like.
FIG. 1 is a cross-sectional view illustrating a state in which a lens hood 3 according to an embodiment to which the present invention is applied is attached to an interchangeable lens 2 attached to a digital single lens reflex camera 1.
The digital single lens reflex camera 1 includes a camera housing 1a, a camera side mount 1b, and an image sensor 1c.
The camera-side mount 1b is an annular mount provided on the front surface in the optical axis direction of the camera housing 1a in order to mount an interchangeable lens 2 described later.
The image pickup device 1c converts a subject image formed by a lens group forming a photographing optical system into an electric signal, and for example, a photoelectric conversion device such as a CCD or a CMOS is used. The image pickup device 1c is arranged in the range inside the camera housing 1a and on the rear side in the optical axis direction. The imaging device 1c has an imaging surface 1d on the front surface in the optical axis direction, and the imaging area is smaller than the imaging area of a single-lens reflex camera for film 11 described later.

The interchangeable lens 2 accommodates a lens group that forms a photographing optical system, and has a lens side mount 2a and an attachment ring 2b.
The lens-side mount 2a is a mount provided at the rear end in the optical axis direction of the interchangeable lens 2 for bayonet coupling with the camera-side mount 1b. Thereby, the interchangeable lens 2 is detachably attached to the digital single-lens reflex camera 1.
The attachment ring 2b is a cylindrical member provided so as to protrude from the front end portion of the interchangeable lens 2 in the optical axis direction in order to attach accessories such as a filter and a cap, for example. A screw portion 2c, which is a female screw, is provided on the entire circumference.

The lens hood 3 includes a hood body 4 and a small-diameter ring 5 (light-shielding part adjusting member).
The hood main body 4 has a small diameter portion 4a, a tapered portion 4b, and a large diameter portion 4c.
The small-diameter portion 4a is a cylindrical portion, and a screw portion 4d that is a male screw is provided on the outer periphery thereof, and is screwed with the screw portion 2c of the interchangeable lens. Thereby, the lens hood 3 is detachably attached to the tip of the interchangeable lens 2 in the optical axis direction (tip on the subject side). The small-diameter portion 4a is provided with an annular flat surface portion radially outward from the edge at the tip end in the optical axis direction. The outer diameter of the ring is substantially the same as the outer diameter of the attachment ring 2b. When the hood body 4 is attached to the interchangeable lens 2, the annular flat surface portion comes into contact with the end surface of the attachment ring 2 b of the interchangeable lens 2 at the front end in the optical axis direction, thereby moving rearward in the optical axis direction. Is regulated.
The taper portion 4b is continuously provided from the outer peripheral edge portion of the annular flat surface portion of the small diameter portion 4a toward the front side in the optical axis direction. The tapered portion 4b is a tapered portion whose diameter increases toward the front side in the optical axis direction.
The large-diameter portion 4c is a cylindrical portion provided continuously from the edge at the tip of the tapered portion 4b in the optical axis direction to the front side in the optical axis direction. The large-diameter portion 4c is provided with a screw portion 4e in the range of the tip in the optical axis direction on the inner periphery. The screw portion 4e is a female screw for attaching a small-diameter ring 5 described later.

The small-diameter ring 5 has a cylindrical portion 5a (annular main body) and a small-diameter portion 5b (second light shielding portion).
The cylindrical portion 5a is a cylindrical portion, and a screw portion 5c that is a male screw is provided on the outer periphery thereof. The screw portion 5 c is screwed with the screw portion 4 e of the hood body 4. Thereby, the small diameter ring 5 is detachably attached to the front end (subject end on the subject side) of the hood body 4 in the optical axis direction. The cylindrical part 5a is provided with a flange part from the edge at the tip in the optical axis direction toward the outside in the radial direction. When the hood body 4 is mounted, the flange portion is regulated in a direction along the optical axis O by contacting the front end of the hood body 4 in the optical axis direction.
The small-diameter portion 5b is an annular flat plate portion provided radially inward from the edge of the cylindrical portion 5a in the optical axis direction, and the edge shape on the radially inner side of the ring is centered on the optical axis O. It is a round shape. The small-diameter portion 5b blocks light rays from outside the angle of view, that is, light rays that enter the interchangeable lens 2 from the outside of the light ray 7a shown in FIG. Thereby, the camera unit can prevent stray light and flare in the lens barrel and obtain a good image.

Next, a state in which the lens hood 3 is attached to the interchangeable lens 2 attached to the film single-lens reflex camera 11 having a so-called 135 format will be described.
FIG. 2 is a cross-sectional view showing a state in which the lens hood 3 according to the embodiment to which the present invention is applied is attached to the interchangeable lens 2 attached to the single-lens reflex camera 11 for film.
The film single-lens reflex camera 11 includes a camera housing 11a, a camera-side mount 1b, and a film 11c.
The camera side mount 1b is provided on the front surface of the camera casing 11a in the optical axis direction. Since the camera side mount 1b uses a common mount with the digital single lens reflex camera 1, the interchangeable lens 2 can be used in common with the digital single lens reflex camera 1.
The film 11c is a film for 35 mm, and has an imaging surface 11d on the front surface in the optical axis direction. The horizontal width of the imaging surface 11d (the width in the direction along the left-right direction of the camera) is a length D11, which is larger than the length D1 (see FIG. 1) of the imaging device 1c.

  When the lens hood 3 is photographed by the single-lens reflex camera 11 for film, the small diameter ring 5 is removed and only the hood body 4 is used. In the lens hood 3, by removing the small diameter ring 5 from the hood body 4, the tapered portion 4b and the large diameter portion 4c form a light shielding portion (first light shielding portion), and from outside the angle of view of the single lens reflex camera 11 for film. , That is, the light incident on the interchangeable lens 2 from the outside of the light 7b shown in FIG. As a result, the necessary light beam outside the light beam 7a and inside the light beam 7b is secured.

FIG. 3 shows an imaging device for comparing the size of the imaging area 1e (second imaging area) of the digital single-lens reflex camera 1 and the imaging area 11e (first imaging area) of the single-lens reflex camera 11 for film. It is a figure which shows 1c and the film 11c typically from the front. The imaging area 1e indicates an imaging area of the digital single-lens reflex camera 1, and the imaging area 1f indicates an imaging area necessary for the imaging area 1e. Similarly, the imaging area 11e indicates an imaging area of the film single-lens reflex camera 1, and the imaging area 11f indicates an imaging area necessary for the imaging area 11e.
As shown in FIG. 3, the imaging area 1e is narrower than the imaging area 11e. In the lens hood 3 of FIG. 1, the hood body 4 and the small-diameter ring 5 shield light rays incident on the interchangeable lens 2 from outside the angle of view corresponding to the imaging region 1f necessary for the imaging area 1e. . In the lens hood 3 of FIG. 2, the hood main body 4 shields light incident on the interchangeable lens 2 from outside the angle of view corresponding to the imaging region 11f necessary for the imaging area 11e.

  As described above, the lens hood 3 of this embodiment is attached to the interchangeable lens 2. The interchangeable lens 2 can also be mounted on a digital single-lens reflex camera 1 having an imaging area 1e (second imaging area) and a film single-lens reflex camera 11 having an imaging area 11e (first imaging area). . When shooting with the digital single-lens reflex camera 1, a small-diameter ring 5 (light-shielding part adjusting member) having a small-diameter part 5b (second light-shielding part) is detachably attached to the hood body 4 and corresponds to the imaging area 1e. Thus, light incident on the lens from outside the angle of view is shielded. On the other hand, when photographing with the film single-lens reflex camera 11, the small diameter ring 5 is removed, and the tapered portion 4b and the large diameter portion 4c of the hood body 4 form a light shielding portion (first light shielding portion), and the imaging area 11e. Corresponding to the above, the light incident on the lens from outside the angle of view is blocked. Thereby, flare and stray light of the interchangeable lens 2 can be prevented, and the image quality of the camera can be improved. In addition, since one lens hood 3 can correspond to two cameras having different imaging areas, the lens hood 3 can be easily handled when the lens is exchanged during photographing. Furthermore, it is not necessary to prepare two types of hoods as in the prior art, and it is possible to pack luggage for shooting in a compact manner.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
(1) In the present embodiment, the lens hood 3 is detachably attached to the interchangeable lens 2 by screw connection. However, the present invention is not limited to this, and any structure can be used. For example, the hood body 4 of the lens hood 3 may be detachably attached to the interchangeable lens 2 by bayonet coupling. The same applies to the structure for attaching the small diameter ring 5 to the hood body 4.

(2) In the present embodiment, the opening shape of the small-diameter portion 5b of the small-diameter ring 5 is circular, but is not limited thereto. For example, when an attachment structure (for example, bayonet coupling or the like) that can determine the angle around the optical axis of the small diameter ring 5 with respect to the interchangeable lens 2 is adopted, the opening shape of the small diameter portion 5b is a rectangular shape corresponding to the photographing field angle. Shape may be sufficient.

(3) In the present embodiment, the small diameter portion 5b of the small diameter ring 5 is an annular flat plate portion provided radially inward from the edge of the cylindrical portion 5a in the optical axis direction. It is not limited to this. For example, the small-diameter ring 5 may be provided with a cylindrical portion extending from the edge at the front end in the optical axis direction of the hood body 4 to the front side in the optical axis direction so as to shield light from outside the angle of view corresponding to the imaging area. .

(4) In the present embodiment, the lens hood 3 has been described as being composed of the hood body 4 and the small-diameter ring 5, but is not limited thereto. For example, if you have an existing lens hood dedicated to a single-lens reflex camera for film, you can prepare only a detachable small-diameter ring and attach it to the existing lens hood so that it corresponds to the imaging area of a digital single-lens reflex camera. Good.

(5) In the present embodiment, the example in which the small diameter ring 5 is attached to the hood main body 4 in order to correspond to the imaging area 1e of the digital single-lens reflex camera 1 is shown. However, the present invention is not limited to this. When using a camera having an imaging area, a small-diameter ring corresponding to the imaging area may be attached. Furthermore, by providing a plurality of small-diameter rings corresponding to a plurality of cameras having different imaging areas, it is possible to perform light shielding corresponding to the plurality of imaging areas.

It is a figure which shows the state which used the lens hood 3 by a present Example for the digital single-lens reflex camera. It is a figure which shows the state which used the lens hood 3 by a present Example for the single-lens reflex camera 11 for films. It is a figure which shows the imaging area corresponding to the lens hood 3 by a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Digital single-lens reflex camera 1a Camera housing 1b Camera side mount 1c Imaging element 1d Imaging surface 1e Imaging area 1f Imaging area 2 Interchangeable lens 2a Lens side mount 2b Attachment ring 2c Screw part 3 Lens hood 4 Hood main body 4a Small diameter part 4b Taper Part 4c Large diameter part 4d Screw part 4e Screw part 5 Small diameter ring 5a Cylindrical part 5b Small diameter part 5c Screw part 7a, 7b Ray 11 SLR camera for film 11a Camera housing 11c Film 11d Imaging surface 11e Imaging area 11f Imaging region

Claims (2)

A lens hood provided at a subject-side tip of an interchangeable lens that can be attached to a camera having a first imaging area and a camera having a second imaging area narrower than the first imaging area,
A hood main body having a first light-shielding portion that shields light incident on the interchangeable lens corresponding to the first imaging area;
A light-shielding part adjusting member having a second light-shielding part that is detachably provided at the subject-side tip of the hood main body and shields light incident on the interchangeable lens corresponding to the second imaging area;
Lens hood with A light beam that is provided at the tip in the optical axis direction of an interchangeable lens that can be attached to a camera having a first imaging area and a camera having a second imaging area that is narrower than the first imaging area, and is incident on the interchangeable lens A light shielding part adjusting member of a lens hood having a first light shielding part that shields light corresponding to the first imaging area,
An annular main body detachably provided at the optical axis direction tip of the lens hood,
A second light-shielding portion that is formed inside the annular main body and shields light incident on the interchangeable lens corresponding to the second imaging area;
The light shielding part adjusting member of the lens hood having

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