JP2006284762A - Lens hood, and camera system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens hood which does not hinder a photographic image even when performing stroboscopic photography while attached to a super-wide angle lens or a super-wide angle zoom lens, and a camera system equipped with the lens hood. <P>SOLUTION: The lens hood has: an attaching part 105 through which the lens hood is attached to the lens barrel 4 of a camera 1 equipped with a light emission part for photography 20; petal-shaped light shielding parts 101, 102 and 103 which are extended in a direction opposite to the lens barrel 4 from the attaching part 105; and a deformed light shielding part 104 which is extended in the direction opposite to the lens barrel 4 from the attaching part 105 and whose edge part 104a is folded inside. The deformed light shielding part 104 can be arranged on the side of the light emission part for photography 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lens hood attached to a photographing lens and a camera system including the lens hood.

2. Description of the Related Art Conventionally, various lens hoods that are attached to the tip of a photographing lens are known in order to prevent harmful rays outside the angle of view from entering the photographing lens of the camera. For example, a cylindrical lens hood is often used for a telephoto lens, and a conical or square lens hood is used for a standard lens or a wide-angle lens. Further, as a lens hood used for an ultra-wide-angle lens, a lens hood in which only a light shielding wall portion corresponding to each side of a photographed image is projected in the distal direction, that is, a subject side is known (for example, Patent Document 1). reference.). This type of lens hood is called a petal-type lens hood or a tulip-type lens hood because the shape of the light-shielding wall portion protruding in the distal direction is similar to a petal.
JP 11-295780 A

  However, when using a strobe for shooting with an ultra-wide-angle lens, especially when using the built-in strobe mounted on the camera body, the strobe light is blocked by the petal-shaped shading wall with the petal-type lens hood attached. Vignetting occurs in so-called strobe light that is partially blocked. For this reason, there is a problem that a black shadow is formed on a part of the photographed image.

  Such a problem also occurs in a zoom lens including an ultra-wide-angle region (hereinafter referred to as “super-wide-angle zoom lens”). For this reason, when using the built-in flash when shooting with an ultra-wide-angle zoom lens, it is necessary to take the troublesome task of removing the lens hood from the lens in consideration of the focal length at all times and if there is a risk of vignetting of the flash. Met.

  Therefore, the present invention has been made in view of the above problems, and includes a lens hood that does not interfere with a photographed image even if the stroboscope is attached to the super wide angle lens or the super wide angle zoom lens, and the lens hood. Provide a camera system.

In order to solve the above problems, the present invention
An attachment part for attaching to a lens barrel of a camera provided with a light emitting part for photographing;
A petal-shaped light-shielding portion extending from the mounting portion in a direction opposite to the lens barrel;
A deformable light-shielding portion having a shape extending from the mounting portion in a direction opposite to the lens barrel and having a tip portion bent inward;
The deformation light-shielding part can be arranged on the photographing light-emitting part side, and provides a lens hood.

The present invention also provides
A camera body having an imaging means;
A lens barrel provided with a photographing optical system for connecting an image of a subject to the imaging means;
A light-emitting unit for photographing that irradiates the subject with photographing auxiliary light;
In a camera system comprising a lens hood attached to the subject side of the lens barrel portion,
The lens hood has a plurality of petal-shaped light-shielding portions extending toward the subject side, and a deformed light-shielding portion having a shape that extends toward the subject side and has a tip portion bent toward the optical axis side of the photographing optical system. In addition, the camera system is characterized in that the deformation light-shielding part is located on the photographing light-emitting part side.

  According to the present invention, a lens hood which is attached to an ultra-wide-angle lens or an ultra-wide-angle zoom lens and does not interfere with a captured image or reduces vignetting of the stroboscopic light even when shooting with a flash, and a camera provided with the lens hood A system can be provided.

(First embodiment)
Hereinafter, a single lens reflex camera system including a lens hood according to a first embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view showing a single-lens reflex camera system including a lens hood according to a first embodiment of the present invention (a strobe 20 described later is in use).
As shown in FIG. 1, the single-lens reflex camera system 1 according to the present embodiment includes a camera body 2, an interchangeable lens 3, and a lens hood 100.

The interchangeable lens 3 is a super-wide-angle zoom lens that includes a cylindrical fixed tube portion 4 that houses a photographing lens, and that can be zoomed within a focal length range of 18 mm to 120 mm.
A mount 5 is formed at the end of the fixed cylinder 4 on the camera body 2 side, and the interchangeable lens 3 is detachably attached to the camera body 2 by a bayonet method. Further, a hood receiving portion 6 for mounting the lens hood 100 is formed on the opposite end portion of the fixed cylinder portion 4, that is, on the outer periphery of the end portion on the subject side (not shown). Further, a zoom operation ring 7 for performing a zoom operation is provided on the outer periphery of the fixed cylinder portion 4. The configuration of the hood receiving portion 6 will be described later.

  The photographic lens includes a first lens group L1, a second lens group L2 that moves in the direction of the optical axis AX by a zoom operation of the zoom operation ring 7, a third lens group L3, and a fourth lens in order from a subject side (not shown). Each lens group is supported by a fixed cylinder portion 4. The second lens unit L2 can perform a focusing operation by moving in the optical axis AX direction by operating a focusing operation ring (not shown) or driving an ultrasonic motor (not shown).

  The camera body 2 includes, in the camera body 10, a finder 11, an imaging unit 12 including a CCD that converts a subject image into an electrical signal, a photometric unit 13 that measures the amount of light in order to determine exposure conditions during shooting, The CPU 14 includes a battery chamber 15 in which a power supply battery is housed, and a release switch (not shown) that gives an instruction to execute shooting. The camera body 10 is formed with an opening 16 for mounting the interchangeable lens 3. Furthermore, a strobe 20 that automatically enters a light emission ready state when the CPU 14 determines that it is necessary from the release operation and exposure conditions is provided at the top of the camera body 2, more specifically at a position almost directly above the opening 16. .

  Here, in general, when shooting with a strobe, that is, when shooting with a strobe, if the light emitting part of the strobe is close to the optical axis, the light of the strobe is reflected on the choroid layer where a lot of blood flows in the retina of the eye, The so-called red-eye phenomenon, in which the eyes of the subject image appear red, is likely to occur. For this reason, the light emitting portion of the strobe needs to be separated from the optical axis as much as possible.

  The strobe 20 in this embodiment is housed in the upper part of the camera body 10 when not in use, and is rotated as shown in FIG. 1 by rotating around a rotation axis (not shown) at the upper rear portion of the camera body 10 when in use. This is an auto pop-up strobe. With this configuration, when the strobe 20 is used, the light emitting portion 21 is separated from the optical axis AX, and the occurrence of the red-eye phenomenon can be reduced. The strobe 20 in the present embodiment has an ability to irradiate a shooting range when a shooting lens having a focal length of 18 mm is used as the interchangeable lens 3.

Hereinafter, the most characteristic configuration of the lens hood 100 in this embodiment will be described.
First, basic functions of the lens hood 100 according to the present embodiment will be described.
Since the photographic lens is composed of a circular lens, a photographic image on the image plane is equivalent to a concentric circle centered on a point intersecting the optical axis AX of the photographic lens. That is, a clear image with little distortion is obtained near the center of the image plane, but when the image is separated from the center to some extent (the image height increases), the image gradually becomes darker and distortion and the like increase. For this reason, a range (hereinafter referred to as “image circle”) suitable for a photographed image by setting a predetermined standard is determined.
On the other hand, the imaging surface of the imaging unit 12 is a rectangle of 23.7 mm wide × 15.6 mm long. For this reason, normally, the diagonal length of the imaging unit 12 is equal to the diameter of the image circle, or the diameter of the image circle is set to be longer than the diagonal length of the imaging unit 12.

  Here, a case is considered where the four corners of the imaging unit 12 are exactly within the image circle, that is, the diagonal length of the imaging unit 12 is the same as the diameter of the image circle. Although the image is formed in the entire area within the image circle, since the imaging surface of the imaging unit 12 is rectangular as described above, an image connected outside the rectangle does not contribute to the captured image. A light beam forming an image that does not contribute to the captured image (hereinafter referred to as “unnecessary light beam”) is not only unnecessary, but may cause an adverse effect on the captured image due to internal scattering or the like. Therefore, the function of the lens hood 100 is to reduce the adverse effect of the unnecessary light flux on the captured image by shielding the unnecessary light flux.

Next, the configuration of the lens hood 100 according to the present embodiment will be described.
2A and 2B are a sectional view and a front view, respectively, showing the configuration of the lens hood according to the first embodiment of the present invention.
As shown in FIG. 2, the lens hood 100 according to the present embodiment has three petal-shaped light shields that extend to the subject side in order to shield unnecessary light flux from an annular member 106 that has a shape whose diameter increases toward the subject side. The parts 101, 102, and 103 are also integrally provided with a modified light shielding part 104 having a shape that extends toward the subject and bends the tip part inward in order to shield the unnecessary light flux.

In detail, the light shielding unit 101 and the light shielding unit 103 have the same length in the subject direction, and are opposed to the left and right as shown in FIG. The lens 3 is disposed so as to be opposed to each other with the optical axis AX interposed therebetween.
In addition, the light-shielding part 102 has a petal shape that is longer in the subject direction than the light-shielding parts 101 and 103, and as shown in FIG. 3 is arranged so as to face the deformable light-shielding portion 104 across the third optical axis AX.

Further, the lens hood 100 is exchanged so that the deformed light-shielding part 104 is located directly above the interchangeable lens 3, that is, directly below the strobe 20 in the camera body 2, on the inner periphery of the end of the annular member 106 opposite to the subject. An attachment portion 105 for attaching to the hood receiving portion 6 of the lens 3 is provided.
Here, in the present embodiment, the hood receiving portion 6 of the interchangeable lens 3 is composed of a guide groove (not shown) extending in the circumferential direction formed on the outer periphery of the subject side end of the fixed cylinder portion 4. Is composed of a convex strip (not shown) that extends in the circumferential direction on the inner periphery of the end of the annular member 106 and fits with the guide groove to position the circumferential position of the lens hood 100 with respect to the fixed cylinder portion 4. The configuration of the attachment portion 105 and the hood receiving portion 6 is not limited to this, and the circumferential position of the lens hood 100 with respect to the fixed cylinder portion 4 can be positioned so that the deformable light shielding portion 104 is disposed directly below the strobe 20. It is good also as a well-known structure.

  When the interchangeable lens 3 with the lens hood 100 attached is attached to the camera body 2 due to the positional relationship between the strobe 20 and the opening 16 and the positioning configuration of the hood 100 described above, the camera body 2 is When viewed from the front, the light emitting portion 21 of the strobe 20, the modified light shielding portion 104, and the optical axis AX of the interchangeable lens 3 are positioned on a straight line in the vertical direction.

Next, the configuration of the modified light shielding unit 104 will be described.
A light beam LE in FIG. 1 indicates the outermost peripheral light beam of a light beam necessary for imaging with a focal length of 18 mm, and light incident on the interchangeable lens 3 from the outside of the light beam LE becomes an unnecessary light beam. In the lens hood 100 according to the present embodiment, unnecessary light fluxes are shielded by the light shielding portions 101, 102, 103 and the modified light shielding portion 104 as shown in FIG. Note that a light beam FE in FIG. 1 indicates an outermost peripheral light beam of strobe light that covers an imaging range with a focal length of 18 mm.

Here, in general, a conventional petal-type lens hood having four petal-shaped light-shielding portions has a configuration in which the light-shielding portion on the strobe side protrudes toward the subject side as indicated by a dotted line (S) in the figure. On the other hand, when photographing using an ultra-wide-angle lens, it is necessary to supply strobe light over the entire photographing range corresponding to a large angle of view, so it is necessary to widen the irradiation range of the strobe light. For this reason, as shown by the dotted line in the figure, the light-shielding portion S that protrudes toward the subject side enters the flash light irradiation range. Therefore, the light beam FE necessary for flash photography and the light beam incident on the light shielding part S indicated by the dotted line are shielded by the light shielding part S, and a part of the photographing range cannot be illuminated.
In addition, the light-shielding part S shown with the dotted line is only what was attached | subjected and shown for convenience in order to demonstrate the light-shielding part of a general petal-type food | hood, and is actually provided in this embodiment. is not.

As described above, the above-described deformed light shielding portion 104 in the lens hood 100 is slightly in front of the front end portion 104a intersecting the light beam FE, that is, slightly near the interchangeable lens 3 and substantially in the optical axis AX. It is provided in a shape bent inward so as to be vertical. Thereby, the deformation | transformation light-shielding part 104 can prevent blocking the light from the flash 20 required for flash photography.
Further, the bent tip portion 104a in the deformed light shielding portion 104 is provided with an adjusted length so that the tip portion 104a extends slightly before the outermost peripheral light beam LE is shielded. That is, the imaging surface (imaging range) at the imaging position is projected onto the light shielding position, and light outside the imaging range is shielded. Thereby, it is possible to appropriately shield only the unnecessary light flux without shielding the light flux necessary for photographing.

More specifically, the bending position and length of the distal end portion 104a in the deformable light-shielding portion 104 are determined based on the focal length of the interchangeable lens 3, the position of the light emitting portion 21 of the strobe 20, the emission angle of the strobe light, and the like. Designed to properly shield unwanted light flux without blocking.
Further, in the present embodiment, as described above, the strobe light is not shielded by bending at the position where the tip end portion 104a of the deformed light shielding portion 104 does not intersect the light beam FE, but the folding position is not limited to this, and the photographed image is not limited thereto. If there is no problem in appearance, the position may slightly cross the light beam FE.

As described above, the lens hood 100 according to the present embodiment can appropriately shield the unnecessary light flux without blocking the strobe light even in the flash photography using the super wide-angle interchangeable lens. You can shoot as it is.
In addition, the single-lens reflex camera system 1 including the lens hood according to the present embodiment can perform flash photography regardless of the focal length with the lens hood attached. For this reason, the troublesomeness which removes the lens hood 100 at the time of flash photography can be eliminated. In addition, it is possible to eliminate a shooting failure in which a part of a captured image becomes dark, which has occurred when performing strobe shooting with the lens hood attached unexpectedly as in the past.
In the present embodiment, the super wide-angle zoom lens is provided as the interchangeable lens 3, but the lens hood 100 is naturally useful for a super-wide angle lens that does not have a zoom function.

(Second Embodiment)
Hereinafter, a single-lens reflex camera system including a lens hood 200 according to a second embodiment of the present invention will be described with reference to the accompanying drawings.
The single-lens reflex camera system of the present embodiment is composed of a camera body, an interchangeable lens, and a lens hood 200 described later. Since the configurations of the camera body and the interchangeable lens are the same as those in the first embodiment, the drawings and The description is omitted. In addition, regarding the lens hood 200 according to the present embodiment, the same reference numerals are given to portions having the same configuration as the lens hood 100 according to the first embodiment, and description thereof is omitted, and characteristic portions are described in detail. explain. These are the same for each of the embodiments after this embodiment.

FIGS. 3A and 3B are a sectional view and a front view, respectively, showing the configuration of the lens hood according to the second embodiment of the present invention.
As shown in FIG. 3, the lens hood 200 according to the present embodiment includes a modified light shielding unit 201 having the same shape as the modified light shielding unit 104 instead of the light shielding unit 102 in the first embodiment. Thereby, the length of the light shielding part in the optical axis direction can be shortened, and the light shielding part can be prevented from protruding to the subject side.

Normally, when using a conventional petal-type lens hood for shooting, the shading part located below the camera body protrudes below the bottom of the camera body, so it is very difficult to place the camera on a desk or the like. It becomes unstable.
On the other hand, in the lens hood 200 according to the present embodiment, the amount of the light shielding portion, that is, the modified light shielding portion 201 disposed on the lower side of the camera body 2 with the above-described configuration is protruded downward from the bottom surface of the camera body 10. For this reason, stability when the camera is placed on a desk or the like can be improved.

  As described above, the lens hood according to the present embodiment can also exhibit the effect of improving the stability of the camera body 2 described above in addition to the same effects as those of the first embodiment. Although it is conceivable that the light shielding part is bent at all four points, it is difficult to attach a filter or the like to the front part of the lens.

(Third embodiment)
Hereinafter, a single-lens reflex camera system including a lens hood 300 according to a third embodiment of the present invention will be described with reference to the accompanying drawings.
4A and 4B are a sectional view and a front view, respectively, showing the configuration of the lens hood according to the third embodiment of the present invention.
As shown in FIG. 4, the lens hood 300 according to the present embodiment is configured to include a modified light shielding unit 301 in place of the modified light shielding unit 104 in the first embodiment.
As described above, the deformable light-shielding portion 104 in the first embodiment has a shape that is bent inward so that the tip end portion 104a is substantially perpendicular to the optical axis.

On the other hand, the deformable light-shielding portion 301 in this embodiment is provided in a shape that is bent obliquely inward slightly before the tip portion 301a intersects the light beam FE. In particular, in the present embodiment, the tip portion 301a is bent at a bending angle that is substantially parallel to the light beam FE.
Thereby, the deformation | transformation light-shielding part 301 can prevent blocking the light from the flash 20 required for flash photography. In this embodiment, the opening part of the lens hood 300 can be enlarged compared with the said 1st Embodiment by the structure which bent the front-end | tip part 301a diagonally. In addition, by projecting the light shielding part forward, an effect of blocking harmful light due to oblique incidence is produced. Therefore, it is possible to more easily perform a filter operation performed by inserting a hand directly into the hood 300.
Note that the bending angle of the tip portion 301a may be freely set as long as it does not block the light beam LE.

  Further, the bent front end portion 301a of the deformed light shielding portion 301 is provided with an adjusted length so that the front end portion 301a extends slightly before the outermost peripheral light ray LE is shielded. Thereby, it is possible to appropriately shield only the unnecessary light flux without shielding the light flux necessary for photographing.

More specifically, the bending position and length of the tip portion 301a in the deformable light shielding portion 301 are determined based on the focal length of the interchangeable lens 3, the position of the light emitting portion 21 of the strobe 20, the emission angle of the strobe light, and the like. Designed to properly shield unwanted light flux without blocking.
Furthermore, in the present embodiment, as described above, the strobe light is not shielded by bending the tip portion 301a of the modified light shielding portion 301 at a position where it does not intersect the light beam FE. However, the folding position is not limited to this, and the captured image is not limited to this. If there is no problem in appearance, the position may slightly cross the light beam FE, and the bending angle can be made gentler by bringing the bending position closer to the annular member 106 side.

  As described above, the lens hood 300 according to the present embodiment can also exhibit the effect of facilitating the above-described filter operation in addition to the same effect as the first embodiment.

(Fourth embodiment)
Hereinafter, a single-lens reflex camera system including a lens hood 400 according to a fourth embodiment of the present invention will be described with reference to the accompanying drawings.
FIGS. 5A and 5B are a sectional view and a front view, respectively, showing the configuration of the lens hood according to the fourth embodiment of the present invention.
As shown in FIG. 5, the lens hood 400 according to the present embodiment is configured to include a modified light shielding unit 401 having the same shape as the modified light shielding unit 301 in place of the light shielding unit 102 in the third embodiment. Thereby, the length of the light shielding part in the optical axis direction can be shortened, and the light shielding part can be prevented from protruding to the subject side. Therefore, as in the second embodiment, the amount of the light-shielding portion, that is, the modified light-shielding portion 401 disposed on the lower side of the camera body 2 is lowered below the bottom surface of the camera body 10, and the camera is placed on a desk or the like. Stability can be improved.

  As described above, the lens hood according to the present embodiment can also achieve the effects of facilitating the filter operation and improving the stability of the camera body 2 in addition to the same effects as those of the first embodiment.

  According to each of the embodiments described above, it is possible to realize a lens hood that is mounted on an ultra-wide angle lens or an ultra-wide angle zoom lens and that does not interfere with a captured image even when performing strobe shooting, and a camera system including the lens hood. .

  Note that the configuration of the lens hood of the present invention is not limited to the above-described four embodiments, and the light shielding unit shields the strobe light or blocks the photographed image so as not to interfere with the unwanted light flux. Any structure can be used. For example, all the light shielding parts may be bent inward. In this case, since the opening of the hood can be enlarged, the filter operation and the like can be performed more easily than a conventional square window lens hood.

It is sectional drawing which shows the single-lens reflex camera system provided with the lens hood which concerns on 1st Embodiment of this invention. (A), (b) is sectional drawing and front view which respectively show the structure of the lens hood which concerns on 1st Embodiment of this invention. (A), (b) is sectional drawing and the front view which respectively show the structure of the lens hood which concerns on 2nd Embodiment of this invention. (A), (b) is sectional drawing and the front view which respectively show the structure of the lens hood which concerns on 3rd Embodiment of this invention. (A), (b) is sectional drawing and the front view which respectively show the structure of the lens hood which concerns on 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Single-lens reflex camera system 2 Camera main body 3 Interchangeable lens 20 Strobe 100 Lens hood 101,102,103 Light-shielding part 104 Deformation light-shielding part 104a The front-end | tip part 105 of a deformation | transformation light-shielding part Attaching part 106 Annular member AX Optical axis

Claims (7)

An attachment part for attaching to a lens barrel of a camera provided with a light emitting part for photographing;
A petal-shaped light-shielding portion extending from the mounting portion in a direction opposite to the lens barrel;
A deformable light-shielding portion having a shape extending from the mounting portion in a direction opposite to the lens barrel and having a tip portion bent inward;
The lens hood characterized in that the deformation light-shielding part can be arranged on the photographing light-emitting part side.   2. The lens hood according to claim 1, wherein the deformed light-shielding portion has the tip portion substantially perpendicular to the photographing optical axis of the camera. There are three shading parts,
One of the light-shielding portions and the deformation light-shielding portion are arranged to face each other across the photographing optical axis of the camera,
3. The lens hood according to claim 1, wherein the remaining two light-shielding portions are arranged to face each other across the photographing optical axis of the camera. Two each of the light-shielding part and the deformation light-shielding part are provided,
The light shielding portions are arranged to face each other across the photographing optical axis of the camera,
3. The lens hood according to claim 1, wherein the deformed light shielding portions are arranged to face each other with a photographing optical axis of the camera interposed therebetween.   2. The shape of each of the light-shielding part and the deformed light-shielding part is such that unnecessary light is prevented from entering the lens barrel based on a focal length of a photographing optical system in the lens barrel. The lens hood according to claim 1.   6. The mounting unit according to any one of claims 1 to 5, wherein the mounting portion positions a circumferential position of the lens hood with respect to the lens barrel in order to dispose the deformed light shielding unit on the photographing light emitting unit side. The lens hood according to claim 1. A camera body having an imaging means;
A lens barrel provided with a photographing optical system for connecting an image of a subject to the imaging means;
A light emitting section for photographing that irradiates the subject with photographing auxiliary light;
In a camera system comprising a lens hood attached to the subject side of the lens barrel,
The lens hood has a plurality of petal-shaped light-shielding portions extending to the subject side, and a deformed light-shielding portion having a shape extending to the subject side and having a tip portion bent toward the optical axis side of the photographing optical system. The camera system is characterized in that the deformation light-shielding part is located on the photographing light-emitting part side.

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