JP2018036368A - Lens accessory and lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens accessory and a lens barrel in which a lens filter can be easily and surely attached to a lens barrel.SOLUTION: A filter frame and a lens cap are provided. The filter frame and the lens cap have a detachable mechanism part for detachably attaching the lens cap to the filter frame, and a rotation regulating part which regulates rotation around a lens optical axis with respect to each other. A rotation regulation is carried out on the basis of the rotation regulating part in an attachment state of the lens cap to the filter frame.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lens accessory that can be attached to a lens barrel and a lens barrel.

  In a general lens barrel such as an interchangeable lens, a female thread is provided at the subject side end of the lens barrel, and a protective filter and a polarizing filter can be attached. Further, as disclosed in Patent Document 1, a female thread is provided at the tip of a protective filter or the like to be attached in the same manner as the lens barrel. Therefore, the cap of the interchangeable lens can be attached so as to engage with the female screw. Thereby, a cap can be attached even with the filter attached.

  On the other hand, in a high-performance large-aperture telephoto single focus lens or the like, the diameter of the first lens group closest to the subject is very large. In general, a filter or cap is not attached to such a lens, and a rubber is provided at the tip of the lens to protect it. By adopting a rubber arrangement on the front, the lens is prevented from being damaged when the lens is placed upright or accidentally hit.

  There was a need to attach a filter even with a front rubber. In that case, in order to maintain the effect of the front rubber, the filter is attached at a position deeper from the tip to the image side.

JP 2013-210447 A

  However, attaching the filter to the recessed position has a problem in workability. In particular, when attaching a filter so as to be screwed into a female screw provided on the lens, as with a filter attached to a general lens, be careful not to touch the filter function surface or the first lens with your finger. It was particularly difficult to screw in.

  The present invention has been made in view of such a situation, and an object thereof is to provide a lens accessory capable of easily and reliably attaching a lens filter to a lens barrel and a lens barrel including the lens accessory. To do.

  In order to achieve the above object, a lens accessory embodying the present invention has a filter frame and a lens cap, and the filter frame and the lens cap are detachable mechanisms for detachably attaching the lens cap to the filter frame. And a rotation restricting portion that restricts rotation around the optical axis of the lens, and the rotation restriction based on the rotation restricting portion is performed when the lens cap is attached to the filter frame.

  A lens barrel embodying the present invention includes a lens barrel body and a lens accessory, and the filter frame is attached to the lens barrel body in a state of being attached to a lens cap.

  Furthermore, the lens barrel embodying the present invention is the lens barrel according to the present invention, wherein the filter frame has a male threaded portion for screwing with the female threaded portion of the lens barrel main body, and the female threaded portion of the lens barrel main body is the same as that of the lens barrel main body. A protective member that is positioned closest to the image side than the subject side and that protects the front end of the lens barrel main body is provided on the outer peripheral side of the female screw portion so as to project from the subject side.

  Furthermore, the lens barrel embodying the present invention is characterized in that, in the above invention, the lens cap is positioned closer to the subject than the protective member when the lens accessory is mounted on the lens barrel body.

  Furthermore, the lens accessory for carrying out the present invention is the above-described invention, wherein the rotation restricting portion includes a convex portion provided on one of the filter frame and the lens cap, and a concave portion provided on the other side at a position facing the convex portion. The convex portion can be switched between a rotation restricted state and a retracted state. In the rotation restricted state, the convex portion and the concave portion are engaged with each other, and in the retracted state, the convex portion is retracted to a position not engaged with the concave portion. It is characterized by doing.

  According to the lens accessory and the lens barrel embodying the present invention, it is possible to provide a lens accessory capable of easily and surely attaching the lens filter to the lens barrel and a lens barrel including the lens accessory. .

It is an external appearance perspective view of the lens accessory which is one Embodiment of this invention. It is an external appearance perspective view of the lens cap single-piece | unit which comprises a lens accessory. It is a fragmentary sectional view of an integrated lens accessory. It is sectional drawing of the state which attached the lens accessory to the lens-barrel. It is an external appearance perspective view of the convex member of the lens accessory which is other embodiment of this invention. It is a fragmentary sectional view at the time of attaching a convex member to a lens cap.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment.

  FIG. 1 is an external perspective view of a lens accessory according to an embodiment of the present invention, and shows a case viewed from the image plane side. The lens accessory 100 shown in the figure includes a lens cap 110 and a lens filter 130, and these figures are in a state where they are attached to each other.

  The lens filter 130 is roughly composed of a filter frame 131 and a filter body 132. The filter main body 132 may be a filter having an optical function such as an ND filter or a PL filter, or may simply be a protective filter used for preventing lens damage. The lens filter 130 is configured by fixing the filter body 132 to the filter frame 131.

  The lens filter 130 has a male threaded portion 133 on the outer peripheral surface of the filter frame 131. Similarly, a corresponding female thread portion 231 is provided at a predetermined location on the front inner peripheral surface of the lens barrel 200. The lens filter 130 is attached to the lens barrel 200 by screwing both the screw portions.

  FIG. 2 is an external perspective view of the lens cap 110 constituting the lens accessory 100, and shows a case when viewed from the image plane side as in FIG. The lens cap 110 is roughly composed of a cap body 111 and an attaching / detaching mechanism 120.

  In the present embodiment, the attachment / detachment mechanism portion 120 includes a claw portion 113 and an operation portion 114, and a groove portion 134 provided on the entire inner peripheral surface of the filter frame 131 so as to correspond to the claw portion 113. Including. As shown in the drawing, the claw portion 113 is provided with a 180-degree distribution, and the operation portion 114 is provided on the subject side of the lens cap 110 so as to correspond to the claw portions 113.

  When the user operates the operation unit 114 of the attachment / detachment mechanism unit 120 in the radial direction, the corresponding two claw portions 113 also advance and retract in the radial direction. By this operation, the claw portion 113 is inserted into the groove portion 134 provided in the filter frame 131, and the lens cap 110 is attached to the lens filter 130. Similarly, when removing, the attachment / detachment mechanism 120 is operated to retract the claw 113 from the groove 134 so that the removal is possible.

  The convex portion 115 constitutes a rotation restricting portion 140 together with the concave portion 135 provided in the filter frame 131. As shown also in FIG. 1, the convex part 115 engages with the corresponding recessed part 135, and they are provided by 180 degree | times distribution. The rotation restricting portion 140 restricts the rotation of the lens cap 110 while the lens cap 110 is attached to the lens filter 130. It can also be said that the phase in the rotational direction when the lens cap 110 is attached to the lens filter 130 is determined.

  FIG. 3 is a cross-sectional view of the lens accessory 100 described above. In particular, this figure (a) has shown AA sectional drawing in FIG. 1, and this figure (b) has shown BB sectional drawing in FIG.

  In both figures, the portion of the lens filter 130 located below has substantially the same configuration. That is, the lens filter 130 has a filter frame 131 and a filter main body 132, and the filter main body 132 is attached to the filter frame 131 by tightening the filter main body 132 inserted from above the filter frame 131 with the presser ring 136 from above. It is fixed.

  This figure (a) demonstrates the structure of the attachment / detachment mechanism part 120 of the lens cap 110 and the lens filter 130. FIG.

  As described above, the lens cap 110 and the lens filter 130 have the attachment / detachment mechanism portion 120 including the claw portion 113, the operation portion 114, and the groove portion 134. The lens cap 110 is mounted by inserting the claw portion 113 that advances and retracts in the radial direction by a user operation into the groove portion 134. The attachment / detachment mechanism portion 120 is provided with a spring (not shown), and the claw portion 113 is always urged radially outward by the elastic force of the spring. The user operates the operation unit 114 against the urging force, and moves the claw portion 113 in the radial direction to attach / detach the lens cap 110.

  On the other hand, FIG. 5B illustrates the configuration of the rotation restriction unit 140 of the lens cap 110 and the lens filter 130.

  As described above, the lens cap 110 and the lens filter 130 have the rotation restricting portion 140 including the convex portion 115 and the concave portion 135. In the present embodiment, the convex portion 115 is provided on the lens cap 110 side and the concave portion 135 is provided on the lens filter 130 side. However, the present invention is not limited to this, and each may be provided in reverse. If the lens cap 110 and the lens filter 130 are attached to each other and they are to be rotated with each other, the wall surfaces in the rotational direction of the convex portions 115 and the concave portions 135 come into contact with each other to enter a rotation restricted state.

  It is desirable that the positional relationship between the convex portion 115 and the concave portion 135 of the rotation restricting portion 140 can be visually recognized by the user. In this embodiment, as can be seen from FIGS. 1 and 2, the convex portion 115 and the concave portion 135 are visible on the outer peripheral surface of the lens cap 110 and the lens filter 130, respectively. As a result, the user can easily align the rotation restricting portion 140. As can be seen from FIG. 2, the attaching / detaching mechanism 120 and the rotation restricting portion 140 are positioned in a 90-degree rotational relationship with each other.

  FIG. 4 is a partial cross-sectional view focusing on the tip portion of the lens accessory 100 described above attached to the lens barrel 200. At the time of attachment, mounting is performed by screwing a male screw portion 133 provided on the outer periphery of the filter frame 131 of the lens filter 130 and a female screw portion 231 provided on the inner peripheral surface of the lens barrel 200.

  Here, the configuration of the front side of the lens barrel 200 will be described. A first lens 210 located closest to the subject side in the optical system of the lens barrel 200 is fixed to the lens mirror chamber 211. A lens pressing ring 212 is used to fix the first lens 210.

  A front ring 230 is fixed to the outer peripheral side of the lens mirror chamber 211 and constitutes an external part of the lens barrel 200. A front rubber 232 formed of an elastic member is fixed to the front end portion of the front ring 230.

  The front rubber 232 is molded and attached so as to protrude from the tip of the lens barrel 200 toward the subject. Thereby, it is possible to prevent the tip of the lens barrel 200 from being damaged even when the lens barrel 200 is placed upright or when it is unintentionally bumped.

  Further, by covering the tip of the lens barrel 200 with a protruding rubber, the first lens 210 is located deepest from the tip of the lens barrel 200, so that the first lens 210 is caused by foreign matter from the outside. It is possible to prevent damage to a certain extent.

  The lens cap 110 is attached to the lens barrel 200 and covers the tip of the front rubber 232 at the tip of the lens barrel 200. Further, the radial heights of the outer peripheral surface of the lens cap 110 and the outer peripheral surface of the front rubber 232 substantially coincide with each other.

  On the other hand, as the first lens 210 is recessed, the female thread portion 231 for attaching the lens filter 130 is also provided at the recessed position. The filter frame 131 of the lens filter 130 is generally thin in the optical axis direction, and is in an inappropriate position for the user to hold the lens filter 130 by hand. In particular, it is even more difficult when the lens filter 130 has a large diameter.

  Therefore, in the lens accessory 100 embodying the present invention, the lens filter 130 is attached to the lens cap 110 and the integrated lens accessory 100 is attached to the lens barrel 200 so that this can be easily performed. Hereinafter, attachment of the lens filter 130 to the lens barrel 200 will be described.

  First, the lens filter 130 is attached to the lens cap 110. At that time, as described above, the concave and convex portions of the rotation restricting portion 140 are aligned with each other.

  Next, with the lens accessory 100 integrated, the male threaded portion 133 of the lens filter 130 and the female threaded portion 231 of the lens barrel 200 are screwed together. The user does not need to have the lens filter 130 directly, but may have the lens cap 110 integrated with the lens filter 130.

  When screwing the screw part, it is necessary to rotate the lens filter 130. However, since both are mutually restricted by the rotation restricting part 140, the lens filter 130 can be screwed by rotating the lens cap 110 together. it can.

  At this time, the user can grip and rotate the operation unit 114 of the attachment / detachment mechanism unit 120 of the lens cap 110, or can grip and rotate the outer peripheral surface of the lens cap 110. In order to facilitate rotational screwing in a state where the lens cap 110 is held, a surface shape such as a knurling may be provided on the operation portion 114 of the attaching / detaching mechanism portion 120 or the outer peripheral surface of the lens cap 110. By providing such a shape, user operability can be improved.

  The rotation restricting portion 140 of the above-described embodiment has a configuration in which the convex portion 115 and the concave portion 135 are provided on the lens cap 110 and the lens filter 130. In this case, when carrying the lens barrel 200, an external force in the rotational direction is applied to the lens cap 110 unintentionally, and the lens filter 130 may be loosened.

  In order to cope with this, for example, it is effective to provide the convex member 150 on the lens cap 110 and the concave portion 135 on the lens filter 130 so that the convex member 150 is detachable from the lens cap 110.

  5 and 6 show an example of such a configuration. FIG. 5 is a perspective view of a convex member 150 that can be attached to and detached from the lens cap 110. 6A is a partial cross-sectional view when the convex member 150 is attached to the lens cap 110 in a rotation-restricted state, and FIG. 6B is a case where the convex member 150 is attached to the lens cap 110 in a retracted state. It is a fragmentary sectional view.

  As shown in the figure, the convex member 150 has a shape that can be inserted into the lens cap 110 either upward or downward, and is locked to the lens cap 110 with a snap fit. The arm portions 151 extending to the left and right of the convex member 150 define the insertion depth of the convex member 150 with respect to the lens cap 110, thereby realizing the rotation restricted state and the retracted state.

  As shown in this figure (a), when the convex member 150 is attached in the rotation restricted state, the protruding portion 152 of the convex member 150 protrudes in the direction of the lens filter 130, so that the concave portion provided at a position corresponding thereto. The rotation is regulated by aligning with 135. On the other hand, as shown in this figure (b), when the convex member 150 is attached in the retracted state, the projecting portion 152 of the convex member 150 does not project in the direction of the lens filter 130, and therefore is provided in the lens filter 130. The lens cap 110 can freely rotate with respect to the lens filter 130 without being aligned with the concave portion 135.

  In addition, when removing the convex member 150 from the lens cap 110, the snap fit of the convex member 150 is cancelled | released by pushing in the part exposed from the opposite side to the side where the convex member 150 was inserted. Is possible.

  With the above-described configuration, it is possible to arbitrarily switch the rotation restriction state of the lens cap 110, and it is possible to prevent unintentional loosening of the lens filter 130 that occurs when the lens barrel 200 is carried.

  As described above, according to the lens accessory and the lens barrel described in the present invention, when the lens filter is attached with a screw, it is not attached directly to the lens barrel, but is attached in an integrated state with the lens cap. It was decided. Further, a rotation restricting portion is provided between the lens filter and the lens cap, and the lens filter can be screwed by gripping and rotating the lens cap.

  With such a configuration, the lens filter can be easily and reliably attached to the lens barrel even when the female thread portion on the lens barrel side is recessed from the front end of the lens.

DESCRIPTION OF SYMBOLS 100 Lens accessory, 110 Lens cap, 111 Cap main body, 113 Claw part, 114 Operation part, 115 Convex part, 120 Detachment mechanism part, 130 Lens filter, 131 Filter frame, 132 Filter main body, 133 Male thread part, 134 Groove part, 135 Concave part 136 presser ring, 140 rotation restricting part, 150 convex member, 151 arm part, 152 protruding part, 200 lens barrel, 210 first lens, 211 lens mirror chamber, 212 lens presser ring, 230 front ring, 231 female screw part, 232 Front rubber

Claims (5)

A filter frame and a lens cap;
The filter frame and the lens cap are
An attachment / detachment mechanism for detachably attaching the lens cap to the filter frame;
A rotation restricting portion for restricting rotation around the optical axis of each lens;
Have
A lens accessory in which rotation restriction based on the rotation restriction portion is performed in a state where the lens cap is attached to the filter frame. A lens barrel body;
The lens accessory according to claim 1;
Have
The lens barrel, wherein the filter frame is attached to the lens barrel body in an attached state with the lens cap. The filter frame has a male screw part for screwing with a female screw part of the lens barrel body,
The female thread portion of the lens barrel main body is located closer to the image side than the subject side of the lens barrel main body,
The lens barrel according to claim 2, wherein a protective member that protects a tip of the lens barrel main body is provided on the outer peripheral side of the female screw portion so as to protrude toward the subject. 4. The lens barrel according to claim 3, wherein the lens cap is positioned closer to a subject side than the protection member when the lens accessory is attached to the lens barrel body. 5. The rotation restricting portion includes a convex portion provided on one of the filter frame and the lens cap, and a concave portion provided on the other and provided at a position facing the convex portion.
The convex portion can be switched between a rotation restricted state and a retracted state,
In the rotation restricted state, the convex portion and the concave portion engage with each other,
The lens accessory according to claim 1, wherein in the retracted state, the convex portion is retracted to a position that does not engage with the concave portion.

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