JP7441648B2 - Accessory adapter and lens hood - Google Patents

Description

The present invention relates to an accessory adapter and a lens hood.

Camera accessories are sometimes attached to the tip of the lens barrel to take pictures. Examples of such camera accessories include lens hoods that prevent unnecessary light from entering from the tip of the lens barrel (Patent Documents 1 to 3).

JP2006-58786A Japanese Patent Application Publication No. 2013-210447 Japanese Patent Application Publication No. 2007-272163

The amount of light that a lens hood should block varies depending on the angle of view of the lens. The lens hood described in Patent Document 1 uses a variable aperture diaphragm to prevent unnecessary light from entering according to changes in the angle of view, but since the aperture diaphragm is a round hole, it prevents unnecessary light from entering in the vertical and horizontal directions. difficult to block. Further, the lens hood described in Patent Document 2 has a fixed light shielding portion, and therefore cannot accommodate lenses having different angles of view. The lens hood described in Patent Document 3 is replaceable depending on the lens, but because the flange has a shape that protrudes greatly, it is difficult to carry it around for each lens, and portability is poor. As described above, there remains room for consideration in the prior art from the viewpoint of increasing the convenience of accessories for lens barrels for changing the intensity of light passing through the lens.

One aspect of the present invention aims to increase the convenience of accessories for lens barrels for changing the intensity of light passing through the lens.

In order to solve the above problems, an accessory adapter according to one aspect of the present invention is a ring-shaped accessory adapter that is detachable from the tip of a lens barrel, and includes a ring-shaped adapter body and an image on the adapter body. an adapter-side engaging part formed on the surface side and detachable from the lens-side engaging part arranged on the distal end side of the lens barrel; and an inner circumferential surface of the adapter main body. a first protrusion projecting from and surrounding the adapter body, the edge of which abuts a plate-shaped light shielding member that enters the adapter body from the object side of the adapter body; Projects from the inner circumferential surface at a position closer to the object than the first protrusion and has a gap from the first protrusion that is equal to or greater than the thickness of the light shielding member, and comes into contact with the first protrusion. and a second convex portion that comes into contact with the light shielding member from the object side when the light shielding member is rotated.

Further, in order to solve the above problems, a lens hood according to one aspect of the present invention is a lens hood that is detachable from the tip of a lens barrel, and includes a ring-shaped adapter body and a lens hood that is attached to the adapter body. a light shielding member, an adapter side engaging portion formed on the image plane side of the adapter body, the adapter side being detachable from the lens side engaging portion disposed on the distal end side of the lens barrel; an engaging part, and a second part that protrudes from the inner circumferential surface of the adapter body and is provided around the adapter body, and that comes into contact with the plate-shaped light shielding member that enters the adapter body from the object side of the adapter body at its edge. one convex portion, and the inner circumferential surface at a position on the inner circumferential surface of the adapter body that is closer to the object than the first convex portion and has a gap from the first convex portion to the thickness of the light shielding member or more. and a second protrusion that protrudes from the object and contacts the light shielding member from the object side when the light shielding member that contacts the first protrusion is rotated.

According to one aspect of the present invention, for example, a highly portable lens hood can be attached to the tip of a lens barrel so as to be replaceable depending on the angle of view of the lens. Thus, according to one aspect of the present invention, it is possible to increase the convenience of an accessory for a lens barrel for changing the intensity of light passing through a lens.

FIG. 2 is an exploded perspective view showing the configuration of an accessory adapter, a lens barrel, and a light shielding plate according to an embodiment. FIG. 2 is a sectional view showing an assembled configuration of the accessory adapter, lens barrel, and light shielding plate shown in FIG. 1. FIG. FIG. 2 is a front view showing one aspect of the light shielding plate of FIG. 1. FIG. FIG. 2 is a front view showing another aspect of the light shielding plate of FIG. 1; It is a perspective view showing composition of an accessory adapter and a light shielding plate concerning one embodiment. FIG. 2 is a front view showing the configuration of an accessory adapter and a light shielding plate according to an embodiment. FIG. 7 is an enlarged view showing a main part of the accessory adapter shown in FIG. 6; FIG. 2 is a front view showing the configuration of an accessory adapter and a light shielding plate according to an embodiment. FIG. 7 is an exploded perspective view showing the configuration of an accessory adapter, a lens barrel, and a light shielding plate according to another embodiment. 10 is a perspective view showing the configuration of the accessory adapter shown in FIG. 9. FIG. 10 is an exploded perspective view showing another example of the configuration of the accessory adapter, lens barrel, and light shielding plate shown in FIG. 9. FIG. 12 is a perspective view showing the configuration of the accessory adapter of FIG. 11. FIG. FIG. 7 is an exploded perspective view showing the configuration of an accessory adapter, a lens barrel, and a light shielding plate according to still another embodiment. FIG. 14 is a sectional view showing a configuration in which the accessory adapter, lens barrel, and light shielding plate shown in FIG. 13 are assembled.

Embodiments of the accessory adapter according to the present invention will be described below. However, the accessory adapter described below is one aspect of the accessory adapter according to the present invention, and the accessory adapter according to the present invention is not limited to the following aspect.

[Embodiment 1]
FIG. 1 is an exploded perspective view showing the configuration of an accessory adapter 10, a lens barrel 20, and a light shielding plate (light shielding member) 30 according to an embodiment. FIG. 2 is a sectional view showing the assembled configuration of the accessory adapter 10, lens barrel 20, and light shielding plate 30.

(Configuration of lens barrel 20)
The lens barrel 20 is an interchangeable lens that is attached to a camera body (not shown). The tip of the lens barrel 20 is the end of the lens barrel 20 on the object side. A camera accessory can be detachably attached to the tip of the lens barrel 20 via an accessory adapter 10. A lens-side protruding portion (lens-side engaging portion) 21 is arranged on the distal end side of the lens barrel 20 . Further, a thread (female thread) 22 is formed at the tip of the inner peripheral surface of the lens barrel 20 .

The lens side protruding portion 21 is a lens side engaging portion for attaching the image plane side end portion 11a of the accessory adapter 10. The lens side protrusion 21 is provided so as to extend in the circumferential direction of the outer circumferential surface on the distal end side of the lens barrel 20 . The lens-side protruding portion 21 is one of the bayonet-type engaging portions, and engages with the adapter-side engaging portion 12 of the accessory adapter 10 . The lens side protruding portion 21 is provided so as to slide along the lens side protruding portion 21 while the adapter side engaging portion 12 is in contact with the lens side protruding portion 21 . The lens-side protruding portion 21 may be provided with a restriction portion that restricts the sliding range of the adapter-side engagement portion 12 . For example, the lens-side protruding portion 21 is formed with a convex portion 21a that protrudes from the lens-side protruding portion 21 toward the image plane side.

(Configuration of accessory adapter 10)
The accessory adapter 10 has a ring shape that can be attached to and detached from the tip of the lens barrel 20. The accessory adapter 10 is for attaching the light shielding plate 30 to the lens barrel 20. The accessory adapter 10 includes an adapter main body 11 , an adapter-side engaging portion 12 , a first convex portion 13 , and a second convex portion 14 .

The adapter main body 11 has a ring shape. An adapter-side engaging portion 12 is formed on the inner circumferential surface of the adapter body 11 on the image plane side. The adapter-side engaging portion 12 is for detachably attaching the adapter body 11 to the tip of the lens barrel 20.

The adapter-side engaging portion 12 is the other bayonet-type engaging portion, and engages with the lens-side protruding portion 21 . The adapter-side engaging portion 12 has a first protrusion 12a, a second protrusion 12b, and a recess 12c. The first protruding portion 12a and the second protruding portion 12b are formed on the inner peripheral surface of the adapter main body 11 and extend in the circumferential direction thereof. The first protruding portion 12a can come into contact with the lens-side protruding portion 21. When the first protrusion 12a contacts the lens-side protrusion 21 and rotates the adapter body 11, the second protrusion 12b moves from the image plane side to the lens side than the lens-side protrusion 21. It can come into contact with the protrusion. The recessed portion 12c is formed by cutting out a part of the convex edge of the second protruding portion 12b, and is formed in a shape into which the convex portion 21a formed on the lens side protruding portion 21 can be fitted. .

The first convex portion 13 protrudes from the inner circumferential surface of the adapter body 11 on the object side and is provided around the adapter body 11 . The first convex portion 13 has an edge that comes into contact with the light shielding plate 30 that has entered the adapter body 11 from the object side of the adapter body 11 . The first convex portion 13 may extend continuously and be provided around the inner peripheral surface of the adapter main body 11, or a plurality of first convex portions 13 may be provided around the inner peripheral surface of the adapter body 11 at intervals. .

The second convex portion 14 protrudes from the inner circumferential surface of the adapter body 11 on the object side. The second convex portion 14 is arranged at a position closer to the object than the first convex portion 13 on the inner circumferential surface of the adapter main body 11 . The second convex portions 14 are provided at at least two opposing positions on the inner peripheral surface of the adapter main body 11.

The second convex portion 14 is disposed at a position with a gap equal to or greater than the thickness of the light shielding plate 30 from the first convex portion 13 in the axial direction of the adapter body 11 . The second convex portion 14 can come into contact with the light shielding plate 30 from a side closer to the object than the light shielding plate 30 when the light shielding plate 30 in contact with the first convex portion 13 is rotated.

(Attachment of accessory adapter 10)
The accessory adapter 10 can be attached to the lens barrel 20 using a bayonet method. Specifically, the accessory adapter 10 is brought close to the tip of the lens barrel 20 with the image plane side end 11a of the accessory adapter 10 facing toward the tip of the lens barrel 20. As a result, the accessory adapter 10 covers the outer circumferential surface of the lens barrel 20, and the first protrusion 12a of the adapter-side engaging portion 12 comes into contact with the lens-side protrusion 21.

Next, the adapter main body 11 is rotated by a predetermined distance in a predetermined direction while the first protrusion portion 12a is in contact with the lens side protrusion portion 21. As a result, the first protrusion 12a slides along the lens-side protrusion 21, and first, the second protrusion 12b is moved from the image plane side of the lens-side protrusion 21 to the lens-side protrusion 21. come into contact with That is, the lens side protrusion 21 is sandwiched between the first protrusion 12a and the second protrusion 12b in the axial direction. Next, when the accessory adapter 10 and the lens barrel 20 are relatively rotated in the circumferential direction, a part of the second protrusion 12b climbs over the convex part 21a of the lens side protrusion 21, and the second protrusion The concave portion 12c formed in the strip 12b engages with the convex portion 21a of the lens side protrusion 21. As a result, rotation of the adapter body 11 with respect to the lens barrel 20 is suppressed, and the sliding range of the adapter side engaging portion 12 on the lens side protrusion portion 21 is restricted. In this way, the adapter-side engaging portion 12 engages with the lens-side protruding portion 21, and the accessory adapter 10 is externally fitted onto the lens barrel 20, completing attachment of the accessory adapter 10 to the lens barrel 20. The accessory adapter 10 is attached to the lens barrel 20 at a predetermined position determined by the convex portion 21a and the concave portion 12c in the circumferential direction.

Note that the accessory adapter 10 (adapter main body 11) may further include a locking mechanism (not shown) that locks the attached state to the lens barrel 20 using a bayonet method. At this time, the lock mechanism includes, for example, when the convex part 21a of the lens-side protruding part 21 and the concave part 12c of the adapter-side engaging part 12 engage, the second protruding part 12b is attached to the lens barrel 20. A switch mechanism that allows movement forward and backward in the radial direction can be employed. According to the locking mechanism, the engagement and disengagement between the concave portion 12c of the second protruding portion 12b and the convex portion 21a of the lens-side protruding portion 21 is achieved by advancing and retreating the second protruding portion 12b in the radial direction. can be controlled. Thereby, rotation of the accessory adapter 10 with respect to the lens barrel 20 can be suppressed, or the suppression can be canceled. Thereby, when the accessory adapter 10 is attached to the lens barrel 20, it is possible to prevent the accessory adapter 10 from accidentally coming off from the lens barrel 20.

(light shielding plate 30)
Next, attachment of the light shielding plate to the accessory adapter will be explained. First, the structure of the light shielding plate will be explained.

(Configuration of light shielding plate 30)
The light shielding plate 30 is a camera accessory that can be attached to the objective side end of the lens barrel 20. The light shielding plate 30 is a member having a substantially rectangular opening, and blocks light outside the opening from the lens of the lens barrel, and allows only light that passes through the opening to pass through. In this way, the light shielding plate 30 is a light shielding member that blocks part of the light that enters the lens barrel. The light shielding plate 30 is attached to the lens barrel 20 via the accessory adapter 10. The light shielding plate 30 is attached to the objective side end 11b of the accessory adapter 10. The light shielding plate 30 has a plate shape.

The light shielding plate 30 has a cutout portion 31 that is a part of a circular outer shape that follows the inner shape of the accessory adapter 10 . That is, the outer edge of the planar shape of the light shielding plate 30 includes circular arc portions located at mutually opposing positions and notches 31 located at mutually opposing positions. The circular arc portion is, for example, a circular arc portion having a diameter slightly smaller than the opening diameter on the object side of the adapter main body 11. The cutout portion 31 is, for example, a portion formed by cutting out a portion overlapping the second convex portion 14 in a straight line when viewed from above.

The light shielding plate 30 may block light evenly over the entire optical path of the lens barrel 20, or may partially block light. 3 is a front view showing one aspect of the light shielding plate 30 in FIG. 1, and FIG. 4 is a front view showing another aspect of the light shielding plate 30 in FIG. 1. As shown in FIGS. 3 and 4, a light shielding plate 30 that blocks part of the light incident on the lens barrel 20 has an opening 32 in a part thereof. By changing the shape and size of the opening 32 of the light shielding plate 30, the light that is blocked can be changed.

(Attachment of light shielding plate 30)
FIG. 5 is a perspective view showing the configuration of the accessory adapter 10 and the light shielding plate 30 according to one embodiment. FIG. 6 is a front view showing the configuration of the accessory adapter 10 and the light shielding plate 30 according to one embodiment. FIG. 7 is an enlarged view of a part of FIG. 6. FIG. 8 is a front view showing the configuration of the accessory adapter 10 and the light shielding plate 30 according to one embodiment.

First, as shown in FIG. 5, the opening surface of the light shielding plate 30 is directed toward the object side end 11b of the adapter body 11, and the circumferential direction of the notch 31 on the outer diameter of the light shielding plate 30 and the second convex portion 14 is aligned. Bring the light shielding plate 30 close to the adapter main body 11 while aligning the positions. As a result, the light shielding plate 30 that has entered the adapter body 11 from the object side of the adapter body 11 comes into contact with the first convex portion 13 .

Next, as shown in FIG. 6, when the light shielding plate 30 in contact with the first convex portion 13 is rotated in the circumferential direction, the position of the cutout portion 31 of the light shielding plate 30 moves, and the second convex portion 14 and the light shielding plate 30 overlap. As a result, the second convex portion 14 comes into contact with the light shielding plate 30 from the object side of the light shielding plate 30, so that the light shielding plate 30 is held between the first convex portion 13 and the second convex portion 14.

Here, as shown in FIGS. 6 to 8, the adapter main body 11 engages with the unevenness 33 formed on the light shielding plate 30 that has been rotated to a predetermined position overlapping the second convex portion 14, thereby preventing the rotation. It further includes a rotation restriction section 15 for restriction. Therefore, when the light shielding plate 30 in contact with the first convex portion 13 is rotated, the unevenness 33 abuts against and engages with the rotation regulating portion 15 . When the unevenness 33 and the rotation restricting portion 15 engage, the light shielding plate 30 does not rotate any further, so that the position of the light shielding plate 30 in the circumferential direction with respect to the adapter body 11 is fixed. In this way, attachment of the light shielding plate 30 to the adapter body 11 is completed.

(Main effects)
In this way, since the accessory adapter 10 is attached to the lens barrel 20 using the bayonet method, the position of the accessory adapter 10 after rotation when the accessory adapter 10 is attached can be uniquely fixed. Therefore, the accessory adapter 10 can be attached to the lens barrel 20 easily and in a short time. Furthermore, since the accessory adapter 10 is removed from the lens barrel 20 using a bayonet method, the accessory adapter attached to the lens barrel 20 can be easily replaced with another accessory adapter in a short time. Furthermore, even when the accessory adapter 10 is repeatedly attached to and detached from the lens barrel 20, the position at which the accessory adapter 10 is attached to the lens barrel 20 can be easily fixed. Furthermore, the accessory adapter 10 can be attached to other lens barrels equipped with the bayonet-type lens side protrusions 21, so the accessory adapter 10 can be shared between multiple lens barrels including the lens barrel 20. can do.

If the light shielding plate 30 is attached to the accessory adapter 10 in advance before attaching the accessory adapter 10 to the lens barrel 20, the accessory adapter 10 with the light shielding plate 30 can be easily attached to the lens barrel 20 using the bayonet method. be able to. Thereby, the light shielding plate 30 can be easily attached to the lens barrel 20. Further, the accessory adapter 10 with the light shielding plate 30 can be easily and quickly removed using the bayonet method. Thereby, the light shielding plate 30 indirectly attached to the lens barrel 20 can be easily and quickly replaced with another camera accessory.

The amount of light that a lens hood should block varies depending on the angle of view of the lens. Therefore, it is necessary to change the lens hood depending on the lens. The light shielding plate 30 can change the amount of light that it blocks by simply changing the shape and size of the opening 32. Therefore, the light shielding plate 30 having the opening 32 opened according to the angle of view of the lens can be used with the lens barrel 20. Just attach it to. Further, since the light shielding plate 30 is plate-shaped, it is not bulky and highly portable even when carrying multiple lenses for each lens.

If the direction of the lens hood is determined depending on the angle of view of the lens, it is necessary to check the direction of the lens hood and attach it to the lens barrel in the correct direction. Since the adapter main body 11 has a rotation restriction part 15, the light shielding plate 30 is positioned simply by rotating it until the unevenness 33 hits the rotation restriction part 15, so that it can be installed in the correct position and in the correct direction. It's easy. Moreover, since the unevenness 33 and the rotation regulating portion 15 engage with each other, it is possible to prevent the light shielding plate 30 from shifting after being correctly attached.

The accessory adapter 10 has a ring shape and engages with the lens barrel 20. Therefore, light from the circumferential direction of the accessory adapter 10 to the lens barrel 20 is blocked. Furthermore, a light shielding plate 30 is attached to the accessory adapter 10 so as to cover the opening on the object side. Therefore, only the light passing through the light shielding plate 30 substantially acts on the lens. In this way, the accessory adapter 10 is suitable for a plate-shaped accessory that provides an optical effect on a lens.

The accessory may be any light shielding member that blocks part or all of the light that enters the lens barrel 20. Examples of the light shielding member other than the aforementioned light shielding plate 30 include an ND filter. Note that when a plate member having the outer shape of the light shielding plate 30 is attached to the accessory adapter 10, the accessory adapter 10 functions as a cap that covers the lens barrel 20 on the object side. The accessory applied to the embodiment of the present invention may be a simple plate-like member that substantially blocks light.

[Embodiment 2]
Other embodiments of the invention will be described below. For convenience of explanation, members having the same functions as the members described in the above embodiment are given the same reference numerals, and the description thereof will not be repeated. This embodiment is similar to the first embodiment described above, except that the accessory adapter is detachably engaged with the lens barrel on the inner peripheral surface thereof.

FIG. 9 is an exploded perspective view showing the configuration of an accessory adapter 110, a lens barrel 20, and a light shielding plate 30 according to another embodiment. FIG. 10 is a perspective view showing the configuration of the accessory adapter 110 of FIG. 9. The accessory adapter 110 has an adapter body 111, a first protrusion 113, a second protrusion 114, a fitting part 115, and a thread 116. Note that the configurations of the first convex portion 113 and the second convex portion 114 are the same as those of the first convex portion 13 and the second convex portion 14 of the first embodiment. Further, the light shielding plate 30 attached to the objective side end 111b of the adapter body 111 is also the same as the light shielding plate 30 of the first embodiment.

FIG. 10 is a perspective view of the accessory adapter 110 viewed from the image plane side. The fitting portion 115 is provided at the end portion 111a of the adapter body 111 on the image plane side. The fitting portion 115 protrudes from the adapter main body 111 toward the image plane side. A thread 116 is formed on the outer circumferential surface of the fitting portion 115 to be screwed into the screw 22. That is, the outer circumferential surface of the fitting portion 115 is a male thread that fits the screw 22. The nominal diameters of the screw 22 and the thread 116 are the same. Thereby, the accessory adapter 110 can be attached to the lens barrel 20 by screwing into the lens barrel 20. In this manner, in this embodiment, the accessory adapter 110 engages with the lens barrel 20 on its inner peripheral surface side.

(Modified example)
The fitting part 115 does not need to have a thread as long as it can be attached to the lens barrel 20. For example, the fitting part 115 may be able to be fitted into the tip of the lens barrel 20. In this form, the fitting portion 115 may have appropriate elasticity and may be made of resin foam, for example. The configuration of a modification of the accessory adapter 110 is shown in FIGS. 11 and 12. FIG. 11 is an exploded perspective view showing another example of the configuration of the accessory adapter 110, lens barrel 20, and light shielding plate 30 shown in FIG. FIG. 12 is a perspective view showing the configuration of the accessory adapter 110 of FIG. 11.

When the accessory adapter 110 is attached to the lens barrel 20, the fitting portion 115 is fitted into the tip of the lens barrel 20. The inner side surface of the tip of the lens barrel 20 is a screw (female screw) 22 . The fitting portion 115 has a partially cut-out cylindrical portion, and the outer diameter of the cylindrical portion matches the inner diameter of the tip of the lens barrel 20 . Therefore, when the accessory adapter 110 is attached to the lens barrel 20, the outer peripheral surface of the fitting portion 115 and the screw 22 engage with each other. In this way, the fitting part 115 is fitted into the tip of the lens barrel 20, and attachment of the accessory adapter 110 to the lens barrel 20 is completed.

[Embodiment 3]
Still other embodiments of the present invention will be described below. For convenience of explanation, members having the same functions as the members described in the above embodiment are given the same reference numerals, and the description thereof will not be repeated. This embodiment is similar to the first embodiment described above, except that the accessory adapter is configured to be separable into a first member on the image side and a second member on the object side.

FIG. 13 is an exploded perspective view showing the configuration of an accessory adapter 120, a lens barrel 20, and a light shielding plate 30 according to still another embodiment. FIG. 14 is a sectional view showing a configuration in which the accessory adapter 120, lens barrel 20, and light shielding plate 30 shown in FIG. 13 are assembled. The accessory adapter 120 includes a first member 121a on the image side, a second member 121b on the object side, an adapter side engaging part 122, a first convex part 123, a second convex part 124, and a tapered part 126. have. Note that the configurations of the first convex portion 123 and the second convex portion 124 are the same as the first convex portion 13 and the second convex portion 14 of the first embodiment. Further, the light shielding plate 30 attached to the objective side of the accessory adapter 120 is also the same as the light shielding plate 30 of the first embodiment.

The first member 121a is an adapter main body on the image plane side, and is a ring-shaped member having an adapter-side engaging portion 122 that can be attached to and detached from the lens-side protrusion 21 of the lens barrel 20. The second member 121b is an adapter body on the objective side, and is a ring-shaped member having a first convex portion 123 and a second convex portion 124 that come into contact with the light shielding plate 30. The second member 121b is detachably connected to the image plane side of the first member 121a.

The inner surface of the end of the first member 121a on the object side is a screw (female screw). The outer surface of the image plane side end of the second member 121b is a thread (male thread) that matches the thread (female thread) of the first member 121a (both threads have the same nominal diameter). That is, threads are formed on the inner surface of the first member 121a and the outer surface of the second member 121b. Thereby, the first member 121a and the second member 121b are connected by screwing.

The tapered portion 126 is provided on the outer circumferential surface of the object-side end of the first member 121a. The tapered portion 126 is recessed from the outer peripheral surface of the first member 121a toward the inner peripheral surface, and extends along the circumferential direction of the outer peripheral surface. The tapered portion 126 is provided in an annular shape over the entire outer peripheral surface of the first member 121a. The tapered portion 126 is used to attach various camera accessories such as caps to the accessory adapter 120 using a covering method.

The accessory adapter 120 attaches the light shielding plate 30 to the lens barrel 20 by attaching the first member 121a to the lens barrel 20 using a bayonet method and attaching the light shielding plate 30 to the second member 121b. Therefore, with the first member 121a attached to the lens barrel 20, by removing or attaching only the second member 121b to which the light shielding plate 30 is attached, the light shielding plate 30 can be attached to the lens barrel 20. It can also be attached to 20. Furthermore, since another second member that can be attached to the first member 121a can be used, it is possible to attach a wider variety of camera accessories to the camera barrel, increasing versatility.

Note that in the accessory adapter 120, the light shielding plate 30 can be attached to the second member 121b, and a lens hood of a covering type can also be further attached to the tapered portion 126. That is, two different camera accessories can be attached to the lens barrel 2 at once. This allows the camera user to use two different camera accessories together, thereby expanding the scope of photography using the camera.

〔Lens hood〕
A lens hood is constructed by attaching the light shielding member described in each of the above-described embodiments to an accessory adapter. The light shielding member in this case may be any member that forms a predetermined frame for blocking light rays on the objective side of the lens, like the light shielding member having the rectangular opening described above. In the lens hood according to this embodiment, a desired optical effect can be obtained depending on the plate-shaped light shielding member described above. Therefore, by changing the plate-shaped light shielding member, various optical effects can be exerted on the lens. Therefore, the convenience can be further improved compared to the conventional case where a plurality of generally trumpet-shaped lens hoods are provided.

〔summary〕
The accessory adapter according to aspect 1 of the present invention is a ring-shaped accessory adapter that can be attached to and detached from the tip of a lens barrel, and includes a ring-shaped adapter body and an adapter formed on the image plane side of the adapter body. a side engaging part that is detachable from the lens side engaging part disposed on the distal end side of the lens barrel; a first convex portion that abuts an edge of the plate-shaped light shielding member that enters the adapter body from the objective side of the adapter body; The light shielding member protrudes from the inner circumferential surface at a position on the side having a gap greater than the thickness of the light shielding member from the first convex portion, and rotates the light shielding member that is in contact with the first convex portion. and a second protrusion that serves as the light shielding member from the objective side when viewed from the object side.

According to this configuration, highly portable plate-shaped accessories can be attached replaceably. Therefore, according to this configuration, it is possible to improve the convenience of the accessory for the lens barrel for changing the intensity of light passing through the lens.

In the accessory adapter according to a second aspect of the present invention, in the first aspect, the lens-side engaging portion is a lens-side protruding portion extending in the circumferential direction of the outer peripheral surface on the distal end side of the lens barrel; The adapter-side engaging portion includes a first protrusion that is formed on the inner circumferential surface of the adapter main body, extends in the circumferential direction, and can abut the lens-side protrusion, and a lens-side protrusion. a second protrusion that can come into contact with the lens-side protrusion from a side closer to the image plane than the lens-side protrusion when the adapter body that the first protrusion has contacted is rotated; May have.

This configuration is even more effective from the viewpoint of easily and reliably determining the orientation of the adapter accessory in the rotational direction.

In the accessory adapter according to aspect 3 of the present invention, in aspect 1 or 2, the adapter main body engages with the unevenness formed on the light shielding member that has been rotated to a predetermined position overlapping the second convex portion. It may further include a rotation regulating section that regulates rotation.

This configuration is even more effective from the viewpoint of easily and reliably determining the orientation of the light shielding member, which is an accessory, with respect to the adapter accessory.

In the accessory adapter according to aspect 4 of the present invention, in any one of aspects 1 to 3, the adapter body includes a ring-shaped first member having the adapter-side engaging portion on the image plane side, and and a ring-shaped second member having a first convex portion and the second convex portion and detachably connected to the first member on the image plane side.

This configuration is even more effective in terms of being compatible with a variety of accessories and increasing the versatility of the accessory adapter.

A lens hood according to aspect 1 of the present invention is a lens hood that is detachable from the tip of a lens barrel, and includes a ring-shaped adapter body and a light shielding member attached to the adapter body, and includes a ring-shaped adapter body and a light shielding member attached to the adapter body. an adapter-side engaging portion formed on the image plane side that is removable from the lens-side engaging portion disposed on the distal end side of the lens barrel; and an inner periphery of the adapter main body. a first convex portion that protrudes from the surface and is provided around the surface of the adapter body, the edge of which abuts the plate-shaped light shielding member that enters the adapter body from the object side of the adapter body; and an inner periphery of the adapter body. protrudes from the inner circumferential surface at a position closer to the object than the first protrusion on the surface and has a gap from the first protrusion that is equal to or greater than the thickness of the light shielding member; and a second convex portion that abuts the light shielding member from the object side when the light shielding member in contact with the light shielding member is rotated.

According to this configuration, it is possible to provide a lens hood to which a highly portable plate-shaped light shielding member is attached in a replaceable manner. Therefore, according to this configuration, the convenience of the lens hood for changing the intensity of light passing through the lens can be improved.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. are also included within the technical scope of the present invention.

10, 110, 120 Accessory adapter 11, 111 Adapter main body 12, 122 Adapter side engaging portion 13, 113, 123 First convex portion 14, 114, 124 Second convex portion 20 Lens barrel 21 Lens side protrusion (Lens side engaging part)
30 Light shielding plate (light shielding member)

Claims (4)

A ring-shaped accessory adapter that can be attached to and detached from the tip of a lens barrel,
A ring-shaped adapter body,
an adapter-side engaging portion formed on the image plane side of the adapter main body, the adapter-side engaging portion being removable from the lens-side engaging portion disposed on the distal end side of the lens barrel;
a first convex portion that protrudes from and is provided around the inner circumferential surface of the adapter body, the edge of which abuts a plate-shaped light shielding member that enters the adapter body from the object side of the adapter body;
protruding from the inner circumferential surface of the adapter main body at a position closer to the object than the first convex portion on the inner circumferential surface of the adapter body and having a gap from the first convex portion equal to or greater than the thickness of the light shielding member; a second convex portion that abuts the light shielding member from the object side when the light shielding member that abuts the first convex portion is rotated;
has
The adapter main body has a ring-shaped first member having the adapter-side engaging portion on the image side, the first convex portion and the second convex portion on the object side, and the first member on the image side. a ring-shaped second member detachably connected to the member;
The inner surface of the object-side end of the first member is a thread, and the outer surface of the image-side end of the second member is a thread that fits into the thread of the first member. The first member and the second member are screws having the same diameter, and the first member and the second member are connected by a screwing method.
accessory adapter. The lens-side engaging portion is a lens-side protrusion extending in the circumferential direction of the outer circumferential surface on the distal end side of the lens barrel,
The adapter-side engaging portion includes a first protrusion that is formed on the inner circumferential surface of the adapter main body, extends in the circumferential direction, and can come into contact with the lens-side protrusion;
a second protrusion that can come into contact with the lens-side protrusion from a side closer to the image plane than the lens-side protrusion when the adapter body with the first protrusion in contact with the lens-side protrusion is rotated; The accessory adapter according to claim 1, further comprising a protrusion. 2. The adapter main body further includes a rotation restriction portion that restricts rotation by engaging with an unevenness formed on the light shielding member that has rotated to a predetermined position overlapping the second convex portion. The accessory adapter described in 2. A lens hood that can be attached to and detached from the tip of a lens barrel,
comprising a ring-shaped adapter body and a light shielding member attached to the adapter body,
an adapter-side engaging portion formed on the image plane side of the adapter main body, the adapter-side engaging portion being removable from the lens-side engaging portion disposed on the distal end side of the lens barrel;
a first convex portion that protrudes from and is provided around the inner peripheral surface of the adapter main body, and abuts an edge of the plate-shaped light shielding member that enters the adapter main body from the object side of the adapter main body;
protruding from the inner circumferential surface of the adapter main body at a position closer to the object than the first convex portion on the inner circumferential surface of the adapter body and having a gap from the first convex portion equal to or greater than the thickness of the light shielding member; a second convex portion that abuts the light shielding member from the object side when the light shielding member that abuts the first convex portion is rotated;
has
The adapter body has a ring-shaped first member having the adapter-side engaging portion on the image side, the first convex portion and the second convex portion on the object side, and the first member on the image side. a ring-shaped second member detachably connected to the member;
The inner surface of the object-side end of the first member is a thread, and the outer surface of the image-side end of the second member is a thread that fits into the thread of the first member. The first member and the second member are screws having the same diameter, and the first member and the second member are connected by a screwing method.
Lens hood.

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