JP2001264852A - Lens hood device for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens hood device having an advantage that a lens hood is housed in a photographing lens barrel by an optimum state (rotational angle) corresponding to a camera type or the like. SOLUTION: In this lens hood device of a camera, the lens hood 20 is attached to the photographing lens barrel 10 of the camera through a bayonet mechanism BY, and the bayonet mechanism BY possesses a first hood side engaging part train K1 incorporating plural lens barrel side engaging parts 15, 16 and 17 disposed in a circumferential direction at the top part 11a of a lens barrel 10 and plural hood side engaging parts 25, 26 and 27 disposed in the circumferential direction at a hood base end part 20b so as to respectively engage with the engaging parts 15, 16 and 17 when a hood 20 is attached to the lens barrel 10 from a base end side and a second hood side engaging part train K2 provided in parallel with it and adjacent to the optical axis direction 0 of the lens barrel 10 and incorporating the plural hood side engaging parts 25, 26 and 27 disposed in the circumferential direction at the hood base end part 20b so as to respectively engage with the engaging parts 15, 16 and 17 when the hood 20 is attached to the lens barrel 10 from a top side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens hood for shielding harmful light from a lens other than a lens angle of view. The present invention relates to a lens hood device of a camera that is enabled.

[0002]

2. Description of the Related Art When photographing with a camera, if light sources such as the sun and a fluorescent lamp are present in an area other than the normal lens angle of view, light from these light sources enters the photographing lens as harmful light, This may cause ghosts and flares in the captured image.

[0003] In order to shield harmful light from other than the lens angle of view, a lens hood for shielding harmful light is mounted on the leading end of the taking lens barrel as needed.

[0004] Among the lens hoods, there is a petal-shaped lens hood in which the tip of the hood is formed in a petal shape so as to block only the harmful light and sufficiently take in light necessary for photographing. On the other hand, a so-called bayonet mechanism is frequently used as a means for detachably attaching a lens hood to a distal end portion of a photographing lens barrel of a camera. The bayonet mechanism basically includes a plurality of engaging portions, for example, engaging claws arranged at predetermined intervals in a circumferential direction on the outer peripheral surface of the distal end portion of the photographing lens barrel, and is capable of engaging with the engaging claws. As described above, the lens hood is provided with a plurality of engaging portions, for example, engaging grooves disposed at predetermined intervals in the circumferential direction on the inner peripheral surface of the base end portion. (Japanese Patent Laid-Open No. 06-1
Therefore, in order to attach and detach the lens hood, it is only necessary to perform the following straight-forward operation and rotation operation of the lens hood with respect to the taking lens barrel. That is, when the lens hood is mounted on the photographic lens barrel, the lens hood is advanced along the optical axis of the photographic lens barrel, and the base end of the hood is fitted into the distal end of the photographic lens barrel. Thereafter, the engaging claw and the engaging groove are engaged by rotating the lever to the right or left. To remove the lens hood, rotate the lens hood left or right to release the engagement between the engagement claw and the engagement groove.
The lens hood is removed by retracting along the optical axis of the taking lens.

[0005] Thus, when performing the attaching / detaching operation of the lens hood, it is necessary to perform a combination operation of a straight operation in the optical axis direction of the taking lens barrel and a rotation operation in the circumferential direction around the same optical axis. Thus, the engaging claw and the engaging groove are engaged or disengaged from each other, whereby the attaching / detaching operation of the lens hood to / from the taking lens barrel can be easily performed.

The above-mentioned bayonet mechanism is commonly used when the lens hood is mounted in a state where the lens hood is inserted into the outer peripheral surface of the photographing lens barrel with the front end and the rear end reversed, and is housed. . That is, the bayonet mechanism is generally configured such that the lens hood can be mounted on the photographic lens barrel both when the lens hood is used and when it is stored.

[0007]

In a configuration in which the lens hood is mounted on the taking lens barrel using a common bayonet mechanism when the lens hood is used and stored, the lens hood is The mounting mode (rotation angle) during use and the mounting mode (rotation angle) during storage are uniquely determined. For this reason, when a petal-shaped lens hood in which the above-described tip portion is formed in a petal shape is used as the lens hood, the following problem occurs.

That is, when the lens hood is stored on the outer peripheral surface of the taking lens barrel, the width and length are set relatively large so as to correspond to a petal piece, especially a landscape screen. A pair of petal pieces,
For example, a built-in flash or the like built in the camera may interfere with each other, and a stable storage state may not be obtained. In addition, a pair of petal pieces of the larger size are
When it is stored so as to be located on both the left and right sides on the outer peripheral surface of the taking lens barrel, it becomes difficult to perform a zoom operation.

As means for solving such a problem,
The first hood ring and the second hood ring are coaxially coupled so as to be relatively rotatable, and one hood ring is attached at a rotation angle that does not interfere with the built-in flash or the like, and the other hood ring is connected to the first hood ring. In some cases, the mounting is completed by performing a rotation operation. (JP-A-7-140522
However, if the above measures are taken, since the lens hood needs to have a double structure, there is a problem that the configuration becomes complicated and the cost increases.

An object of the present invention is to provide a camera lens hood device having the following advantages.

(A) When the lens hood is not used,
The lens hood can be attached to the photographing lens barrel in an optimum state (rotation angle) according to the type of the camera and the like, and can be stored.

(B) The structure of the lens hood and the like can be prevented from becoming complicated, and can be manufactured at low cost.

(C) When the lens hood is used, the lens hood can be mounted on the taking lens barrel in a predetermined mode (rotation angle) and used.

[0014]

In order to solve the above-mentioned problems and achieve the object, a lens hood device for a camera according to the present invention is configured as follows.

(1) A lens hood device for a camera according to the present invention is a lens hood device for a camera provided so that the lens hood can be detachably attached to a photographic lens barrel of the camera via a bayonet mechanism. The bayonet mechanism includes a plurality of lens barrel-side engaging portions formed along a circumferential direction at a distal end portion of the photographing lens barrel, and the lens hood is attached to the photographing lens barrel from a base end side. When doing, so that each can be engaged with the lens barrel side engaging portion,
A first hood-side engaging portion row including a plurality of hood-side engaging portions formed in a base end portion of the lens hood along a circumferential direction; and a first hood-side engaging portion row. And, provided independently with a partition wall in the optical axis direction of the photographing lens barrel, and when the lens hood is attached to the photographing lens barrel from the distal end side, the lens barrel side engaging portion and A second hood-side engaging portion row including a plurality of hood-side engaging portions formed in a base end portion of the lens hood along a circumferential direction so as to be engageable. .

(2) The lens hood device of the camera according to the present invention is the lens hood device according to the above (1), wherein the lens hood has a cylindrical shape at the base end and a petal shape at the tip end. It is a petal-shaped lens hood.

(3) The lens hood device for a camera according to the present invention is the lens hood device according to the above (2), wherein the lens hood device in the first hood-side engaging portion row is tightly engaged with each other. Of the pair of the hood-side engaging portion and the barrel-side engaging portion, the engagement dimension of the taking lens in the optical axis direction in one pair is the engagement dimension in the optical axis direction of the other pair. It is characterized by being set to different values.

A lens hood device for a camera according to claim 2, wherein

(4) The lens hood device of the camera according to the present invention is the lens hood device according to the above (1), (2) or (3), wherein the lens barrel side engaging portion and the hood side engagement portion are provided. The pair with the mating portion is characterized by being constituted by a combination of an engaging claw and an engaging groove.

(5) The lens hood device for a camera according to the present invention is the lens hood device according to the above (1), (2), (3) or (4), wherein A click mechanism is provided between the hood side engaging portion and the hood side engaging portion.

(6) The lens hood device of the camera according to the present invention is the lens hood device according to (1) or (2) or (3) or (4) or (5). An edge portion is formed on the end surface of the tip portion forming a petal shape, and exterior coating is applied to the outer peripheral surface side of the lens hood and matte coating is applied to the inner peripheral surface side with the edge portion as a boundary. Features.

(7) The lens hood device for a camera according to the present invention is the lens hood device according to the above (6), wherein the edge portion is such that a sharp portion is located on an inner peripheral surface of the lens hood. , Characterized in that the end surface is an inclined surface.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment [Configuration] FIGS. 1A and 1B are views showing the appearance of an electronic camera provided with a lens hood device according to one embodiment of the present invention. FIG. 3A is a perspective view illustrating a state in which the lens hood is mounted on a photographic lens barrel of an electronic camera when the lens hood is used, and FIG. It is a perspective view showing the state stored on the outer peripheral surface of.

FIGS. 2A and 2B schematically show the structure of a bayonet mechanism BY in a lens hood device according to an embodiment of the present invention. FIG. FIG. 4 is a cross-sectional view of a main part showing a state where the lens hood is mounted on a photographing lens barrel of an electronic camera when the lens hood is not used; FIG. It is an important section sectional view shown.

In FIG. 1A, reference numeral 1 denotes a camera body, which includes a release button 2, a pop-up strobe 3, and the like. A photographing lens barrel 10 is attached to the front of the camera body 1. The photographing lens barrel 10 includes a photographing lens 11, a focus ring 12, and a zoom ring 1.
3 and so on. A lens hood 20 is detachably attached to a distal end portion 10a of the taking lens barrel 10 via a bayonet mechanism BY described later. The lens hood 20 is integrally formed of, for example, a synthetic resin or the like.
0b has a cylindrical shape. The lens hood 20 and the bayonet mechanism BY constitute a lens hood device of the present invention.

As shown in FIGS. 1A and 2A, when the lens hood is used, the lens hood 2
0 is fitted into the taking lens barrel 10 from the base end side. At this time, the distal end portion 10 of the photographing lens barrel 10
a lens barrel side engaging portion row K0 described later provided on the outer peripheral surface of
(Engagement claws 15, 16, 17) against the lens hood 20
A first hood-side engaging portion row K1 (engaging grooves 25, 26, 2), which will be described later, is provided on the inner peripheral surface of the base end portion 20b.
7) engage.

As shown in FIGS. 1B and 2B, when the lens hood is not used, the lens hood 20 is fitted into the photographing lens barrel 10 from the distal end side. At this time, the tip part 1 in the photographing lens barrel 10
0a provided on the outer peripheral surface of the lens barrel 0a
(Engagement claws 15, 16, 17) against the lens hood 20
A second hood-side engaging portion row K2 (engaging grooves 25, 26, 2) described later provided on the inner peripheral surface of the base end portion 20b in FIG.
7) engage.

As shown in FIGS. 2A and 2B, the first hood-side engaging portion row K1 and the second hood-side engaging portion row K
A clearance CA is provided between the end surface of the partition wall R that separates the front end 2 and the outer peripheral surface of the distal end portion 10 a of the photographing lens barrel 10. The clearance CA is for allowing elastic deformation of the distal end portion 10a at the time of operation of a click mechanism described later.

FIG. 3 is a view showing a specific structure of the lens hood 20. FIG. 3 (a) is a front view showing an upper part of the lens hood 20 cut away, and FIG. FIG. 3A is a side view of the left side of the figure as viewed from the direction of arrow B.

FIG. 4 is a view showing a specific structure of the lens hood 20. FIG. 4A is a view of FIG. 3A as viewed from the direction of arrow A. FIG. FIG. 4B is a cross-sectional view showing a part of FIG. 4A by cutting out and enlarging it.

FIGS. 3 (a) and 3 (b) and FIG. 4 (a)
As shown in (b), the lens hood 20 has a pair of upper and lower members having the same shape so that an efficient light-shielding region corresponding to a horizontally long screen obtained via the optical system including the photographing lens 11 is obtained. The shape and size of the petal pieces 21 and 22 and the pair of left and right petal pieces 23 and 24 having the same shape are greatly different.

That is, the length La and the width Wa of the pair of petal pieces 21 and 22 formed to face each other are set relatively large so that a relatively wide range of light-shielding areas can be obtained. . On the other hand, the pair of petal pieces 23 and 24 formed to face left and right has a length Lb and a width Wb such that a relatively narrow light-shielding area can be obtained.
Is set relatively small.

An edge E is formed on the end face of the petal pieces 21, 22, 23, 24 in the lens hood 20. As shown in FIG. 4B, the edge portion E is formed by, for example, chamfering only the outer peripheral surface side of the lens hood 20 so that the sharp portion P
The petal piece 2 so as to be located near the inner peripheral surface I of the petal.
End surfaces 1, 22, 23, and 24 are inclined surfaces T.

As shown in FIGS. 4A and 4B, an outer surface treatment layer TA is formed on the outer peripheral surface side of the lens hood 20 with the edge portion E as a boundary, and on the inner peripheral surface side. An inner surface treatment layer TB is formed. The outer surface treatment layer T
A is obtained by applying, for example, a smooth surface treatment suitable for the outer peripheral surface of the hood, and then using a paint having a required gloss and color for exterior use. The inner surface treatment layer TB is obtained by performing a matting process (for example, corrugated unevenness) suitable for the inner peripheral surface of the hood and then performing a matte coating using a matting paint.

Therefore, the paint for exterior in the outer surface treatment layer TA and the paint for matting in the inner surface treatment layer TB are separated by the sharp portion P of the edge portion E, thereby preventing the paints from overlapping each other. For this reason, the occurrence of uneven coating can be minimized. Moreover, since the sharp portion P is provided on the inner peripheral surface I of the lens hood 20, there is no possibility that the light shielding function of the lens hood 20 is impaired by the presence of the edge portion E.

As shown in FIGS. 3A and 3B and FIG. 4A, one of the components of the bayonet mechanism BY is provided on the inner peripheral surface of the base end portion 20b of the lens hood 20. The first hood-side engaging portion row K1 and the second hood-side engaging portion row K2 are provided adjacent to and parallel to each other. Each of the engagement grooves forming the first hood-side engagement portion row K1 and the second hood-side engagement portion row K2 is a component of the click mechanism CL as shown in FIG. It has a projection M, a stopper ST for limiting the depth of engagement, and a spacer SP formed by extending the terminal end. These will be described in detail below.

FIGS. 5A and 5B show a bayonet mechanism BY.
(A) shows a first hood-side engaging portion row K
It is a development view which shows the relationship between 1st and 2nd hood side engaging part row K2, and lens-barrel side engaging part row K0, (b) is one of the engagement grooves 27 which are hood side engaging parts. FIG. 4 is a partial cross-sectional view of a state in which a pair of engaging claws 17 serving as a barrel-side engaging portion are engaged with each other, as viewed from the front side.

As shown in FIGS. 5 (a) and 5 (b), the outer peripheral surface of the distal end portion 10a of the taking lens barrel 10 is a component of a lens barrel side engaging portion row K0 along the circumferential direction. A certain length V
A plurality of (three in this embodiment) engagement claws 15, 16, 1
7 are formed at 120 ° intervals. These engaging claws 1
A plurality of constituent elements of the first hood-side engaging portion row K1 are arranged along the circumferential direction on the inner peripheral surface of the base end portion 20b of the lens hood 20 so as to be engageable with the lens hoods 5, 16, and 17, respectively. (Three in this embodiment) engagement grooves 25, 26, 27
They are formed at 20 ° intervals. These engagement grooves 25, 2
There is an empty space of length S between 6, 27.

On the opposite side of the partition wall R, a second hood-side engaging portion row K2 formed in exactly the same structure as the first hood-side engaging portion row K1, is point-symmetric with respect to the above K1. It is provided in a suitable position. Therefore, if the front and rear directions of the lens hood 20 are reversed by 180 °, a state where K1 and K2 are exchanged is exhibited. For the sake of simplicity, the following description of the engagement grooves 25, 26, and 27 will be made by taking K1 as an example.

Engaging claws 15, 1 which closely engage with each other
6, 17 and an engagement groove 25, 26, 27, for example, an engagement dimension t1 in the optical axis direction of the taking lens barrel 10 in a pair of an engagement claw 17 and an engagement groove 27 ( FIG.
(A) illustrates the thickness dimension of the engagement claw 17), and the engagement dimension t2 of the other pair in the optical axis direction ((a) in FIG. 5).
The thickness dimension of the engaging claw 16 is set to a value different from that shown in FIG. In the example of FIG. 5, t1 <t2 is set.

Therefore, the engagement claw and the engagement groove can be engaged only when the pair of the engagement claw and the engagement groove is a combination of 15 and 25, 16 and 26, and 17 and 27. . For this reason, if the engagement dimension is set in advance so that the engagement can be performed as described above only when the lens hood 20 is mounted in a correct posture, the lens hood 20 is always in a correct mode. It will be mounted on the cylinder 10. Note that this point will be described in more detail in the section on the operation.

The engaging claws 15, 16, 17 and the engaging groove 2
A click mechanism CL is provided between 5, 26 and 27. As shown in FIG. 5 (b), the click mechanism CL engages with the engaging claws 15, 1 of the taking lens barrel 10.
A concave N is provided on the side of the lens hood 6, 17 and a projection M is provided on the side of the engagement groove 25, 26, 27 of the lens hood 20.
Thus, the engagement claws 15, 16, 17 and the engagement grooves 25, 2
When the engagement between the protrusions 6 and 27 has been completed, the protrusion M is snapped into the depression N with a click. Therefore, the user can engage the engaging claws 15, 16, 17 with the engaging grooves 25, 26,
27 can be confirmed to be in the locked state. Further, when the engagement between the engagement claws 15, 16, 17 and the engagement grooves 25, 26, 27 is released, the projection M is detached from the depression N by impact. For this reason, the user needs to engage the engaging claws 15, 1
It can be confirmed that the disengagement of the engaging grooves 25, 26 and 27 with the engaging grooves 25, 26 and 27 has been started.

[Operation] First, in order to use the lens hood 20, the lens hood 20 is moved to the photographing lens barrel 1 of the camera.
The operation in the case of mounting at 0 will be described. Lens hood 20
In a state where the petal pieces 21 and 22 are rotated counterclockwise by a predetermined angle from the angle at which the petal pieces 21 and 22 oppose each other, the proximal end portion 20b is opposed to the distal end portion 10a of the photographing lens barrel 10, and FIG. As shown by a solid arrow a, the lens is pushed toward the camera body (downward in the figure) along the lens optical axis direction O. Then, each engagement groove 2 in the first hood-side engagement portion row K1 provided in the base end portion 20b of the lens hood 20 is formed.
The empty space of the length S existing between 5, 26, and 27 corresponds to each engaging claw 15 of the length V (S> V) in the lens barrel side engaging portion row K0 of the photographing lens barrel 10. , 16,17. Then, the lens hood 20 is rotated clockwise to try to engage the engagement groove with the engagement claw.

At this time, as shown in the case X in FIG. 6A, the engaging groove 25 and the engaging claw 15 correspond, the engaging groove 26 and the engaging claw 16 correspond, and the engaging groove 27 and engaging claw 1
In the case where 7 and 7 correspond, all the pairs can be engaged because the engagement dimensions are the same for each pair.

However, as shown in the case Y in FIG. 6A, when the engagement grooves 25, 26, 27 are shifted 120 ° to the right in the figure as compared with the case X, That is, the engaging groove 27 corresponds to the engaging claw 15, the engaging groove 25 corresponds to the engaging claw 16, and the engaging groove 26 corresponds to the engaging claw 1.
7 correspond to the engagement dimension of the pair at the center in the figure, and the pair at the right end in the figure does not match the engagement dimension itself, but the pair at the right end in the figure has a large engagement groove side. It is possible. However, the pair at the left end in the figure cannot be engaged because the engagement dimensions do not match and the engagement groove side is small. Therefore, in this case Y, the lens hood 20 cannot be mounted on the taking lens barrel 10. In other words, case Y
Mounting in such a mode is prohibited.

As shown in a case Z in FIG. 6A, the engagement grooves 25, 26, 27 are further shifted 120 ° to the right in the figure as compared with the case Y. That is, the engaging groove 26 corresponds to the engaging claw 15, the engaging groove 27 corresponds to the engaging claw 16, and the engaging groove 25 corresponds to the engaging claw 1.
7 correspond to the engagement dimensions at the left end in the figure, and the engagement dimensions themselves do not match at the right end pair in the figure. It is possible. However, the pair at the center in the figure cannot be engaged because the engagement dimensions do not match and the engagement groove side is small. Therefore, in this case Z, the lens hood 20 cannot be mounted on the taking lens barrel 10. In other words, case Z
Mounting in such a mode is prohibited.

As shown in FIG. 6A, a specific one of a plurality of pairs (a combination of 27-17 in this example)
When the engagement dimension of only
As shown by Z, the engagement groove having a small engagement dimension (27 in this example) functions as an element for inhibiting engagement (represented by the symbol *).

FIG. 6B shows a case where the engagement dimension of only one specific pair (25-15 in this example) of a plurality of pairs is set large. In this case, as shown by cases y and z, the engagement claw (15 in this example) having a large engagement size functions as an element for inhibiting the engagement (indicated by the symbol *). The other points are the same as those in the case of FIG.

Thus, in the case of FIG. 5A,
As shown by the solid arrow b, the first hood-side engaging portion row K1
Are engaged with the engaging claws 15, 16, 17 of the lens barrel side engaging portion row K0. 5A, the engaging claws 15, 16, 17 of the lens barrel side engaging portion row K0 are relatively opposed to the first hood side engaging portion row K1. It is inserted into each of the engagement grooves 25, 26, 27, and the tip of the claw (left end in the figure) is a stopper S in the groove.
Stop when it hits T. Thus, each of the engaging claws 15, 16, 17 and each of the engaging grooves 25, 26, 27 are in an engaged state as indicated by broken hatched lines in the figure. Each engagement claw 15,
When the engagement of the engagement grooves 16, 17 with the engagement grooves 25, 26, 27 is completed, the click mechanism M operates. Therefore, the user can confirm that the engagement is completed.

Until the protrusion M is recessed into the depression N,
Deformation distortion corresponding to the height of the projection M occurs between the taking lens barrel 10 and the lens hood 20. This deformation distortion is caused by the first hood-side engaging portion row K1 and the second hood-side engaging portion row K
2 and the clearance C existing between the end face of the partition wall R partitioning between the lens barrel 2 and the outer peripheral face of the taking lens barrel 10.
With A, the elastic deformation of the lens hood 20 is allowed and substantially absorbed.

Next, the operation of removing the lens hood 20 from the taking lens barrel 10 when the use of the lens hood 20 is completed will be described. When the lens hood 20 in the mounted state is rotated counterclockwise, each of the engagement grooves 25 and 2 is rotated.
6 and 27 rotate in the direction opposite to the direction indicated by the solid arrow b in FIG. For this reason, the engagement claws 15, 16, 1
The disengagement with No. 7 is started. Each engaging claw 15, 16, 1
The click mechanism M operates at the same time when the disengagement of the engagement groove 7 with each of the engagement grooves 25, 26, 27 starts. Therefore, the user can confirm that the disengagement has been started.

The empty space existing between the engagement grooves 25, 26, 27 in the first hood-side engagement section row K1 is equivalent to each of the lens barrel-side engagement section rows K0 of the photographing lens barrel 10. When the positions substantially coincide with the positions of the engagement claws 15, 16, 17, the lens hood 2 is moved along the lens optical axis direction O in a direction opposite to the direction indicated by the solid arrow a in FIG.
0 is pulled backward in the direction away from the camera body. By doing so, the base portion 2 of the lens hood 20
0b is detached from the distal end portion 10a of the taking lens barrel 10.

In order to fit the lens hood 20 to the outer peripheral surface of the photographic lens barrel 10 to make it in a housed state, the front and rear directions of the lens hood 20 are reversed with respect to the time of use. From the proximal end. In this case, as shown in FIG. 1B and FIG. 2B, the second hood-side engaging portion row K2 of the lens hood 20 is changed to the lens barrel-side engaging portion row K0 of the taking lens barrel 10. Will be engaged. The basic operation in this case is exactly the same as the operation described above. Therefore, the description is omitted.

In the example shown in FIG. 5, the first hood-side engaging portion row K1 and the second hood-side engaging portion row K2 are formed in exactly the same structure so as to exhibit a point-symmetric state. ing.
However, it is not necessary to provide the second hood-side engaging portion row K2 in a point-symmetrical manner with respect to the first hood-side engaging portion row K1, and to have exactly the same structure as the first hood-side engaging portion row K1. No need to form.

In the present embodiment, the second hood-side engaging portion row K2 used when the lens hood 20 is stored is separated from the first hood-side engaging portion row K1 by a partition wall R. They are provided completely separately and independently.
For this reason, the formation position and the engagement dimension (thickness dimension in the optical axis direction of the lens) of each of the engagement grooves 25, 26, 27 are determined by the respective engagement grooves 25, 26, 27 in the first hood-side engagement section row K1. There is no restriction at all due to the formation situation.

Thus, depending on the shape of the camera body 1 based on the model of the camera and other conditions, the lens hood 2
It is possible to set the rotation angle at the time of storing 0 to a desired angle. Therefore, even when the petal-shaped lens hood 20 is used as the lens hood, the petal piece 21
24 can be prevented from interfering with a built-in flash or the like. Therefore, when not in use, the petal-shaped lens hood 20 can be stably and securely fitted and stored in the outer peripheral surface of the taking lens barrel 10.

(Features of Embodiment) [1] In the lens hood device of the camera shown in the embodiment, the lens hood 20 can be detachably mounted on the taking lens barrel 10 of the camera via the bayonet mechanism BY. A lens hood device for a camera provided as described above, wherein the bayonet mechanism BY includes the photographic lens barrel 1
When the lens hood 20 is attached to the photographing lens barrel 10 from the base end side, and a plurality of lens barrel side engaging portions 15, 16 and 17 formed along the circumferential direction at the distal end portion 10a And a proximal end portion 20 of the lens hood 20 so as to be engageable with the lens barrel side engaging portions 15, 16 and 17, respectively.
b, a first hood-side engaging portion row K1 including a plurality of hood-side engaging portions 25, 26, 27 formed along the circumferential direction.
Are provided independently in parallel with the first hood-side engaging section row K1 and in the optical axis direction O of the photographing lens barrel 10 with a partition wall R therebetween. When the lens hood 20 is mounted from the distal end side, the lens hood 20 is formed along the circumferential direction at the base end portion 20b of the lens hood 20 so as to be engageable with the lens barrel side engaging portions 15, 16, 17 respectively. The plurality of hood-side engaging portions 25, 26,
27, and a second hood-side engaging portion row K2 including a second hood-side engaging portion row K2.

[2] The lens hood device of the camera described in the embodiment is the lens hood device according to the above [1], wherein the base portion 20b has a cylindrical shape and the distal portion 20a Is a petal-shaped lens hood 20 having a petal shape.

[3] The lens hood device of the camera described in the above embodiment is the lens hood device according to [2], wherein the first hood side engagement is closely engaged with each other. The hood-side engaging portions 25, 2 in the row K1
6, 27, and the lens barrel side engaging portions 15, 16, 17, the engagement dimension t1 in the optical axis direction of the photographing lens in one pair is the relationship in the optical axis direction in the other pair. It is characterized in that it is set to a value different from the total size t2.

[4] The lens hood device of the camera according to the embodiment is the lens hood device according to the above [1], [2] or [3], wherein the lens barrel side engaging portion 15,
The pair of the hood-side engaging portions 25, 26, 27 and the hood-side engaging portions 25, 26, 27 is characterized by being constituted by a combination of an engaging claw and an engaging groove.

[5] The lens hood device of the camera described in the embodiment is the lens hood device according to the above [1], [2], [3] or [4], wherein Mating parts 15, 16, 17 and the hood-side engaging parts 25, 2
6 and 27, a click mechanism CL is provided.

[6] The lens hood device of the camera described in the embodiment is the lens hood device according to the above [1] or [2] or [3] or [4] or [5],
An edge portion E is formed on the end surface of the tip portion 20a in the shape of a petal in the lens hood 20, and the edge portion E
The exterior coating (TA) is applied to the outer peripheral surface of the lens hood 20 and the matte coating (TB) is applied to the inner peripheral surface of the lens hood 20.

[7] The lens hood device of the camera described in the above embodiment is the lens hood device according to the above [6], wherein the edge portion E has a sharp portion P inside the lens hood 20. It is characterized in that the end surface is an inclined surface T so as to be located on the peripheral surface I.

(Modification) The lens hood device of the camera shown in the above-described embodiment includes the following modifications.

The lens barrel side engaging portion is an engaging groove, and the hood side engaging portion is an engaging claw.

A lens hood made of a material other than synthetic resin, such as light metal.

[0067]

According to the present invention, a camera lens hood device having the following advantages can be provided.

(A) When the lens hood is not used,
The lens hood can be attached to the photographing lens barrel in an optimum state (rotation angle) according to the type of the camera and the like, and can be stored.

(B) The structure of the lens hood and the like can be prevented from becoming complicated, and can be manufactured at low cost.

(C) When using the lens hood, the lens hood can be mounted on the taking lens barrel in a predetermined mode (rotation angle) and used.

[Brief description of the drawings]

FIG. 1 is a view showing an appearance of an electronic camera provided with a lens hood device according to an embodiment of the present invention, and FIG. 1 (a) is a perspective view showing a state where the lens hood is mounted on a taking lens barrel of the electronic camera. 3B is a perspective view showing a state in which the lens hood is housed on the outer peripheral surface of the taking lens barrel of the electronic camera.

FIG. 2 is a diagram showing a schematic configuration of a bayonet mechanism BY in the lens hood device according to one embodiment of the present invention;
(A) is a sectional view of a main part showing a state in which a lens hood is attached to a photographic lens barrel of an electronic camera, and (b) shows a state in which the lens hood is stored in a reverse direction in a photographic lens barrel of the electronic camera. FIG.

FIGS. 3A and 3B are diagrams showing a specific structure of a lens hood in a lens hood device according to an embodiment of the present invention, wherein FIG. FIG. 2A is a side view of the figure viewed from the direction of arrow B, and shows the left half surface in the figure cut away.

4A and 4B are diagrams showing a specific structure of a lens hood in a lens hood device according to an embodiment of the present invention, wherein FIG. 4A is a view of FIG. FIG. 4B is a cross-sectional view showing a cutaway and enlarged view of a part of FIG.

FIGS. 5A and 5B are diagrams showing a configuration of a bayonet mechanism in the lens hood device according to the embodiment of the present invention, wherein FIG.
(B) is a developed view showing the relationship between the hood-side engaging portion row and the second hood-side engaging portion row, and the lens barrel-side engaging portion. FIG. FIG. 5 is a partial cross-sectional view of a state in which one of engagement claws, which is a lens barrel-side engagement portion, is engaged with each other as viewed from the front.

6A and 6B are explanatory diagrams of the operation of the bayonet mechanism in the lens hood device according to one embodiment of the present invention, wherein FIG. 6A illustrates only one specific pair of a plurality of pairs including an engagement groove and an engagement claw. A diagram showing an example of a case where the engagement dimension is set small,
(B) of a plurality of pairs consisting of an engagement groove and an engagement claw,
The figure which shows the example at the time of setting the engagement dimension of only one specific pair large.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Camera main body 10 ... Photographing lens barrel 15, 16, 17 ... Engagement claw 20 ... Lens hood 20a ... Tip part of lens hood 20b ... Base end part of lens hood 21, 22, 23, 24 ... Petal piece 25 , 26, 27 ... engagement groove BY ... bayonet mechanism K0 ... lens barrel side engagement part row K1, K2 ... first and second hood side engagement part row R ... partition wall CL ... click mechanism M ... projection N ... Depression ST ... Stopper SP ... Spacer TA ... Outer surface treatment layer TB ... Inner surface treatment layer E ... Edge part P ... Sharp part T ... Slope surface O ... Shooting lens optical axis V ... Length of engaging claw S ... Length of free space t1, t2: Thickness dimensions (engagement dimensions) of the engagement claws

Claims (7)

[Claims] 1. A lens hood device for a camera, wherein a lens hood is detachably mounted on a photographic lens barrel of the camera via a bayonet mechanism, wherein the bayonet mechanism includes the photographic lens barrel. A plurality of lens barrel side engaging portions formed along the circumferential direction at the distal end portion of the lens barrel, and the lens barrel side engaging portion when the lens hood is attached to the photographing lens barrel from the base end side. A first hood-side engaging portion row including a plurality of hood-side engaging portions formed along a circumferential direction at a base end portion of the lens hood so as to be engageable with each other; When the lens hood is attached to the photographing lens barrel from the distal end side, the mirror is provided in parallel with the engaging portion row and separated by a partition wall in the optical axis direction of the photographing lens barrel. Engage with cylinder side engagement part A second hood-side engaging portion row including a plurality of hood-side engaging portions formed along a circumferential direction at a base end portion of the lens hood as possible. Lens hood equipment. 2. The camera lens hood device according to claim 1, wherein said lens hood is a petal-shaped lens hood having a base portion having a cylindrical shape and a tip portion having a petal shape. 3. The imaging in one of a pair of the hood-side engaging portion and the lens-barrel-side engaging portion in the first hood-side engaging portion row, which are tightly engaged with each other. The lens hood device for a camera according to claim 2, wherein the engagement dimension of the lens in the optical axis direction is set to a value different from the engagement dimension of the other pair in the optical axis direction. 4. A pair of the lens barrel side engaging portion and the hood side engaging portion is constituted by a combination of an engaging claw and an engaging groove. 4. The lens hood device of the camera according to 3. 5. The camera according to claim 1, wherein a click mechanism is provided between the barrel-side engaging portion and the hood-side engaging portion. Lens hood device. 6. An edge portion is formed on an end surface of a tip portion in the shape of a petal in the lens hood, and an exterior coating is applied to an outer peripheral surface of the lens hood and a gloss is applied to an inner peripheral surface of the lens hood with the edge portion as a boundary. The lens hood device for a camera according to claim 1, wherein the erase coating is applied. 7. A camera lens according to claim 6, wherein said edge portion has an inclined surface such that a sharp portion is located on an inner peripheral surface of said lens hood. Hood equipment.