JP2006030750A - Camera accessory device and camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera accessory device which is in simple structure and can be mounted on a camera through an easy operation. <P>SOLUTION: An adapter 100 is the camera accessory device which is mounted on and demounted from the camera 50 having an engagement groove 53 in at least a portion of the outer periphery of a lens armor 52 housing a lens barrel 51. The adapter 100 is constituted by combining a lock member 110 and an engagement member together. The lock member 110 is in a cylindrical tube shape and has an extruded part 112 on its inner peripheral wall. The engagement member 130 is in a cylindrical tube shape and has an engagement piece 131 which has its outer periphery held rotatably on the inner periphery of the lock member 110 and also has a projection 133 at at least a portion of the inner peripheral wall. The adapter 100 is held on the camera by engaging the projection 133 of the engagement piece 131 with the engagement groove 53 of the camera in a locking state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a camera accessory device such as an adapter and a lens hood that can be attached to and detached from a camera.

A conventional lens hood is disclosed in Patent Document 1, for example. The lens hood disclosed in Patent Document 1 is configured to be bayonet-coupled with a lens barrel of a camera. By performing bayonet coupling in this way, the position of the light shielding plate of the lens hood can be changed, and the incidence of harmful light not only from the position directly above but also from obliquely or directly from the side can be cut off.
JP-A-6-82880

  However, in the conventional lens hood, it is necessary to attach a bayonet structure to the lens hood and the lens barrel, and the structure is complicated accordingly.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a camera attachment device that solves the above problems and that can be attached to a camera with a simple structure and simple operation.

  In order to achieve the above object, a camera attachment device of the present invention is a camera attachment device that attaches to and detaches from a lens barrel or a camera having an engagement groove on at least a part of an outer periphery of a lens exterior housing the lens barrel. A locking member having a circular tubular shape and having an extruded portion on the inner peripheral wall; and an engaging piece having a circular tubular shape whose outer periphery is rotatably held on the inner circumferential surface of the locking member and having a protrusion on at least a part of the inner circumferential wall. A state in which the engagement piece is pushed out by the pushing portion of the lock member and a state in which the engagement piece is not pushed out by rotating with respect to the lock member while being held by the lock member And an engagement member that can be switched to the projection, and when the engagement piece is pushed out in a state of being attached to the camera, the protrusion of the engagement piece is formed in the engagement groove of the camera. Engage And by and held in the camera.

  According to the above-described present invention, it is possible to obtain a camera attachment device that can be attached to a camera with a simple structure and simple operation.

(Embodiment)
(1) Outline An outline of the present invention will be described below with reference to FIGS. FIG. 1 is an exploded perspective view of the camera 50, the adapter 100, and the lens hood 40. FIG. 2 is a side view when the adapter 100 is attached to the camera 50 and the lens hood 40 is attached to the adapter 100.

  The adapter 100 of the present invention can be fixed to the camera 50 by a simple operation. Specifically, the adapter 100 can be fixed to the camera 50 only by turning the lock member 110 of the adapter 100 in the direction of arrow B in FIG.

  The adapter 100 can be attached to and detached from the lens exterior 52 of the camera 50. The adapter 100 is fixed to the camera 50 when attached to the camera 50. The lens hood 40 can be attached to and detached from the adapter 100. The lens hood 40 is also fixed to the adapter 100 when it is attached to the adapter 100. Therefore, the lens hood 40 is fixed with respect to the camera 50. Therefore, when the lens hood 40 is attached to the camera 50, the notch 41 of the lens hood 40 is always in a fixed positional relationship with the camera 50, and a constant light shielding can be realized.

  Also, the lens hood 40 can be attached to the adapter 100 with the notch 41 facing the subject as shown in FIG. 2, and conversely, the notch 41 is facing the camera 50. It can also be installed in a state. Since the lens hood 40 can be attached to the adapter 100 with the cutout portion 41 facing the camera 50, the entire structure can be made compact even when the lens hood 40 is attached, which is convenient for carrying.

  The camera 50 has a lens barrel 51 that holds a lens. The lens barrel 51 protrudes from the lens exterior 52 when in use, and is stored in the lens exterior 52 when not in use. Therefore, the camera 50 is a so-called collapsible camera. However, the present invention is not limited to a retractable camera but can be applied to a camera that does not retract. When the present invention is applied to a camera that is not retracted, a camera that combines the lens barrel 51 and the lens exterior 52 is provided. A groove-like engagement groove 53 is formed on the outer periphery of the lens exterior 52.

  FIG. 3 is a perspective view of the camera 50 as viewed from below. A restriction hole 54 is provided at the tip of the lens exterior 52.

  FIG. 4 is a perspective view of the adapter 100 as viewed from the camera 50 side. The adapter 100 is configured by combining the lock member 110, the holding member 120, and the engagement member 130.

  The lock member 110 has a circular tube shape. The lock member 110 is provided with a cover portion 111 on the inner periphery on the camera 50 side. The cover part 111 is for covering the pressed part 132 described later.

  The holding member 120 has a circular tube shape. The holding member 120 is rotatably held on the inner periphery of the lock member 110 at the outer periphery. A regulating rib 121 is provided on the inner peripheral wall of the holding member 120. The restriction rib 121 fits into the restriction hole 54 of the camera 50 shown in FIG. 3 when the adapter 100 is attached to the camera 50. Accordingly, the holding member 120 is regulated so as not to rotate along the outer periphery of the lens exterior 52 when the adapter 100 is attached to the camera 50. The holding member 120 has a hood attachment portion 122 for attaching the lens hood 40 to the tip of the lens hood 40 side. The hood mounting portion 122 has a cam formed on the outer periphery. Since the cam regulates the lens hood 40, the holding member 120 can always fix the lens hood 40 in a fixed positional relationship.

  The engaging member 130 is a circular tube. The engaging member 130 is fixed to the holding member 120. An engagement piece 131 is provided on a part of the engagement member 130 on the camera 50 side. Furthermore, the engagement piece 131 is provided with a pressed part 132 and a protrusion 133. The pressed portion 132 abuts on a push portion 112 (see FIG. 5) of the lock member 110 described later, and thereby the entire engagement piece 131 is pushed out toward the center of the diameter of the engagement member 130. When the engaging piece 131 is pushed out in the direction of the diameter center of the engaging member 130 with the adapter 100 mounted on the camera 50, the protrusion 133 engages with the engaging groove 53 of the camera 50, and the adapter 100 moves to the camera 50. Can be prevented from leaving.

(2) Configuration of Adapter 100 FIG. 5 is an exploded perspective view of the adapter 100 as viewed from the lens hood 40 side. The adapter 100 can be assembled by fitting the engaging member 130 to the outer periphery of the holding member 120 from the camera 50 side and fixing the fixed member to the inner periphery of the lock member 110. Hereinafter, each configuration will be described in detail.

  A combination part 126 is provided on the lens hood 40 side of the holding member 120. Further, the outer peripheral wall near the center of the holding member 120 is provided with a lock convex portion 124 and an unlock convex portion 125. The lock convex part 124 and the unlock convex part 125 are protrusions provided at predetermined intervals. A fixed convex portion 123 is provided on the outer peripheral wall of the holding member 120 on the camera 50 side.

  The engaging member 130 can be fixed to the holding member 120 by combining with the holding member 120 so that the inner peripheral wall of the engaging member 130 contacts the outer peripheral wall of the holding member 120. When the engaging member 130 is fitted to the outer periphery of the holding member 120 from the camera 50 side, the fixing portion 134 of the engaging member 130 engages with the fixing convex portion 123 of the holding member 120. Thereby, the engaging member 130 is fixed to the holding member 120. Further, as described above, the engagement piece 131 is provided at the tip of the engagement member 130 on the camera 50 side, and the pressed piece 132 and the protrusion 133 are provided on the engagement piece 131. The pressed part 132 is provided at the forefront of the engagement piece 131 and has a bulge on the outer periphery. Due to this swelling, the pressed part 132 is easily pushed out by the pushing part 112 of the lock member 110 described later. The protrusion 133 is formed on the inner peripheral wall of the engagement piece 131 so as to be along the circumferential direction. The engagement piece 131 has elasticity and is urged in a direction opposite to the diameter center direction of the engagement member 130.

  In the embodiment of the present invention, the engaging member 130 is configured as a member different from the holding member 120. This is because the material of the engaging member 130 can be formed of a material different from the material of the holding member 120. For example, it is possible to mold only the engaging member 130 with a material having good slidability. However, the present invention is not limited to this embodiment, and the engaging member 130 and the holding member 120 may be integrally formed. By doing in this way, the process for combining the holding member 120 and the engagement member 130 can be omitted.

  A combination holding portion 114 is formed on the inner peripheral wall of the lock member 110 on the lens hood 40 side. The combination holding portion 114 engages with the combination portion 126 of the holding member 120 when the holding member 120 with the engaging member 130 fixed therein is fitted into the lock member 110. Thereby, the holding member 120 is held by the lock member 110 without coming out of the lock member 110. A protrusion-like lock engagement portion 113 is formed on the inner peripheral wall of the central portion of the lock member 110. The lock engaging portion 113 selectively engages with the lock convex portion 124 and the unlock convex portion 125 of the holding member 120. When the lock engagement portion 113 engages with the lock convex portion 124, the engagement piece 131 is held in a state of being pushed out toward the center of the diameter of the engagement member 130 (hereinafter, this state is referred to as a lock state), When the lock engaging portion 113 engages with the unlocking convex portion 125, the engaging piece 131 is held in a state where it is not pushed out toward the center of the diameter of the engaging member 130 (hereinafter, this state is referred to as an unlocked state). . Further, a cover portion 11 and a pushing portion 112 are formed on the inner peripheral wall of the lock member 110 on the camera 50 side. The cover part 11 covers the pressed part 132 of the engaging member 130 in the unlocked state. The extruding portion 112 has a shape that protrudes little by little along the direction of arrow A in the figure. The pushing part 112 abuts on the pressed part 132 of the engagement piece 131 in the locked state.

(3) Function of Adapter 100 (3-1) Outline of Function of Adapter 100 As described above, when the holding member 120, the engagement member 130, and the lock member 110 are combined, the adapter 100 can be obtained. In the combined state, the lock member 110 can be rotated in the direction of arrow B in FIG. 5 until the holding member 120 and the engagement member 130 are locked, and the arrow A in FIG. 5 until the lock member 110 is unlocked. Can be turned in the direction. The function of the adapter 100 will be described in detail below with reference to FIGS.

  6, 9, and 12 are cross-sectional views seen from the camera 50 side with the adapter 100 being cut in a portion of the pressed portion 132. 7, 10, and 13 are cross-sectional views when the adapter 100 is cut in the optical axis direction at the portion to be pressed 132. 8, 11, and 14 are cross-sectional views as seen from the camera 50 side with the adapter 100 being cut in a portion of the lock engaging portion 113. 6 to 8 are diagrams illustrating the unlocked state, FIGS. 9 to 11 are diagrams illustrating the state immediately before the locked state, and FIGS. 12 to 14 are diagrams illustrating the locked state.

(3-2) Unlocked state In the unlocked state, as shown in FIG. 6, the pressed portion 132 is covered with the cover portion 111 without being pushed out toward the center of the diameter of the engaging member 130. Since the pressed portion 132 is covered with the cover portion 111 in the unlocked state, it is possible to prevent the protrusion 133 and the engaging groove 53 from engaging with each other as shown in FIG. The insertion and removal in the direction of the arrow CD in the figure with respect to 50 can be reliably ensured. Therefore, the adapter 100 can be attached to and detached from the camera 50 in this state.

  Further, the lock engaging portion 113 of the lock member 110 is engaged with the unlock convex portion 125 as shown in FIG. In this state, the lock member 110 is locked by locking means (not shown) and cannot rotate in the direction of arrow A in the figure. On the other hand, the lock member 110 can rotate in the direction of arrow B in the figure. When rotating in this direction, since the lock engaging portion 113 is engaged with the unlocking convex portion 125, the lock engaging portion 113 gets over the unlocking convex portion 125, so that a sense of resistance (click feeling) is generated. . Therefore, when the user does not intend, the adapter 100 can be held in the unlocked state.

(3-3) Intermediate State When the lock member 110 is turned in the direction of arrow B in FIG. 8 in the unlocked state, the unlocked state is released and the state shown in FIGS.

  As shown in FIG. 9, by rotating the lock member 110 in the direction of arrow B in FIG. 8, the pressed portion 132 starts to abut on the pushing portion 113 and is pushed out toward the center of the diameter of the engaging member 130. At this time, as shown in FIG. 10, the protrusion 133 starts to engage with the engagement groove 53. Moreover, the lock engaging part 113 is located between the unlocking convex part 125 and the locking convex part 124 as shown in FIG.

(3-4) Locked state When the lock member 110 is further rotated from the state shown in FIG. 9 in the direction of arrow B in the figure, the locked state shown in FIGS.

  As shown in FIG. 12, the pressed part 132 rides on the pushing part 113 and is pushed out toward the diameter center of the engaging member 130. In this state, as shown in FIG. 13, the protrusion 133 engages with the engagement groove 53, so that the adapter 100 cannot be detached from the camera 50 in the direction of arrow C in the drawing. Moreover, the lock engaging part 113 is hold | maintained in the position which got over the lock convex part 12, as shown in FIG. The locking member 110 is locked by locking means (not shown) and is configured so that it cannot be rotated any more in the direction of arrow B in the drawing.

(4) Summary As described above, the adapter 100 according to the embodiment of the present invention is a camera that is attached to and detached from the camera 50 having the engagement groove 53 on at least a part of the outer periphery of the lens exterior 52 that houses the lens barrel 51. It is an accessory device. The adapter 100 is formed by combining a lock member 110 and an engagement member. The lock member 110 has a circular tubular shape and has an extruded portion 112 on the inner peripheral wall. The engagement member 130 has a tubular shape, and has an engagement piece 131 having an outer periphery rotatably held on the inner periphery of the lock member 110 and having a protrusion 133 on at least a part of the inner peripheral wall. The engagement member 130 is engaged with the state in which the engagement piece 131 is pushed out by the pushing portion 112 of the lock member 110 (lock state) by rotating with respect to the lock member 110 while being held by the lock member 110. It can switch to the state (unlocked state) where the piece 131 is not pushed out. When the engaging piece 131 is pushed out while being attached to the camera 50, the adapter 100 engages the engaging groove 53 of the camera 50 with the protrusion 133 of the engaging piece 131. Retained. With this configuration, the adapter 100 can be fixed to the camera 50 with a simple operation.

  In the embodiment of the present invention, the lens hood 40 is attached to the camera 50 via the adapter 100, but the lens hood 40 and the adapter 100 may be integrated.

  Since the camera attachment device of the present invention has a simple structure and can be attached to the camera with a simple operation, it can also be applied to a cylindrical attachment device attached to the lens barrel or lens exterior of the camera.

1 is an exploded perspective view of an adapter, a lens hood, and a camera according to an embodiment of the present invention. The side view which shows the state which mounted | wore the camera of the adapter and lens hood of embodiment of this invention The perspective view seen from the lower surface of the camera of embodiment of this invention The perspective view seen from the camera side of the adapter of an embodiment of the invention The exploded perspective view seen from the lens hood side of the adapter of an embodiment of the invention Sectional drawing in the unlocked state of the adapter of embodiment of this invention Sectional drawing of the principal part in the unlocked state of the adapter of embodiment of this invention Sectional drawing in the unlocked state of the adapter of embodiment of this invention Sectional drawing in the intermediate state of the adapter of embodiment of this invention Sectional drawing of the principal part in the intermediate state of the adapter of embodiment of this invention Sectional drawing in the intermediate state of the adapter of embodiment of this invention Sectional drawing in the locked state of the adapter of embodiment of this invention Sectional drawing of the principal part in the locked state of the adapter of embodiment of this invention Sectional drawing in the locked state of the adapter of embodiment of this invention

Explanation of symbols

40 lens hood 41 notch 50 camera 51 lens barrel 52 lens exterior 53 engagement groove 54 restriction hole 100 adapter 110 lock member 111 cover part 112 push-out part 113 lock engagement part 114 combination holding part 120 holding member 121 restriction rib 122 Hood mounting portion 123 Fixed convex portion 124 Lock convex portion 125 Unlock convex portion 126 Combination portion 130 Engaging member 131 Engaging piece 132 Pressure-receiving portion 133 Protrusion 134 Fixed portion

Claims (2)

A camera accessory device that attaches to and detaches from a lens barrel or a camera having an engagement groove on at least a part of the outer periphery of a lens exterior housing the lens barrel.
A lock member having a circular tubular shape and having an extruded portion on an inner peripheral wall;
It has a circular tubular shape, and the outer periphery is rotatably held on the inner periphery of the lock member. The engagement member has a protrusion on at least a part of the inner peripheral wall. A combination of an engaging member that can be switched between a state in which the engaging piece is pushed out by the pushing portion of the lock member and a state in which the engaging piece is not pushed out by rotating with respect to the locking member;
When the engaging piece is pushed out in a state of being attached to the camera, the protrusion of the engaging piece engages with an engaging groove of the camera, whereby the camera attachment device is held by the camera. A camera to which the camera accessory device according to claim 1 can be attached.

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