JP6701998B2 - Accessories that can be attached to the lens barrel - Google Patents

Description

  The present invention relates to an accessory that can be attached to a lens barrel, and particularly to an accessory that can be attached to a lens barrel by a bayonet mechanism. Accessories that can be attached to the lens barrel include a hood for blocking unnecessary light, a front conversion lens for changing the focal length, and a lens cap.

  Conventionally, there has been proposed a technique for improving a torque feeling and a click feeling when an accessory such as a hood is attached to and detached from a lens barrel by a bayonet mechanism.

  Japanese Patent Laid-Open No. 6-130466 discloses a hood mounting bayonet mechanism in which an introduction portion for introducing a flat surface portion of the hood is provided at an attachment start end portion of the hood on the outer periphery of the bayonet claw of the lens barrel. By providing an engaging part that engages with the flat part of the hood at the attachment end part, a common charging part is set when the hood is used and when it is stored, and the click feeling is good in both cases. It is disclosed to construct a hood mounting bayonet structure and a hood.

  In Patent Document 2 (JP 2001-066666 A), in an accessory for a lens barrel, an accessory main body and an accessory main body are formed by separate members, and an elastically deformable click member is provided. When the accessory is attached to or detached from the barrel, the click member slides while elastically deforming with respect to the outer peripheral portion of the bayonet claw of the lens barrel, and at the same time, the click member contacts the sloped portion formed at the circumferential end portion of the bayonet claw. By elastically deforming by an amount smaller than the amount of elastic deformation in the area other than the sloped area by contacting, the accessory mounting and dismounting parts are made into two parts, improving the operational feeling such as torque and click feeling when mounting and dismounting. There is disclosed a configuration that can be achieved with a simple configuration.

  Japanese Patent Laid-Open No. 7-159858 discloses a hood mounting device having a bayonet structure in which at least one of a lens barrel and a hood is provided with a biasing member for biasing in the optical axis direction, and a lens mirror is provided. By providing a protrusion in the optical axis direction on at least one of the cylinder and the hood, and by providing a recess in the optical axis direction on the other end, the protrusion engages at the position where the first and second bayonet claws overlap. A hood attachment device is disclosed in which the hood is fixed to the lens barrel when the hood is attached and the hood attachment is easy to remove.

JP-A-6-130466 JP, 2001-066666, A JP, 7-159858, A

  The conventional techniques disclosed in the prior art documents have the following problems.

  In the hood mounting bayonet structure and the hood disclosed in Patent Document 1, since a torque feeling when the hood is attached is generated by elastic deformation of the hood body, generation of an appropriate torque feeling and maintenance and improvement of strength of the hood body It is not easy to achieve both.

  In the lens barrel accessory disclosed in Patent Document 2, since the elastically deformable click member is provided separately from the accessory body, the mechanism of the lens barrel accessory is complicated and the easy assembling is impaired. Further, the torque generating portion of the click member is supposed to improve the torque feeling when the lens barrel accessory is attached and detached, but does not contribute to improve the click feeling favorably.

  In the hood mounting device having the bayonet structure disclosed in Patent Document 3, at least one of the lens barrel and the hood is provided with a projection in the optical axis direction, and the other is provided with a recess in the optical axis direction in which the projection engages. Since the above is provided, a mechanism or operation for releasing the protrusion engaged with the recess is required. In addition, since the projection and recess are engaged in the optical axis direction, the bayonet claw of the hood has a cantilever shape that is exposed to the outside. It is a mechanism with anxiety that will end up.

  By the way, regarding accessories such as a hood that is attached to the lens barrel by the bayonet mechanism, in addition to the problem of improving the torque feeling and clicking feeling when attaching and detaching, it is particularly demanded to adopt a metal material for the exterior member. ..

  The use of metallic materials for such accessories is expected to improve strength and texture. The lens barrel to which the accessory is attached is made of a member that uses a large amount of metal material in a product model that requires higher strength and texture.

  On the other hand, with regard to the accessory, the strength required for the function of the accessory is often sufficiently secured by adopting a resin material such as engineering plastic.

  On the other hand, in an accessory in which a metal material is mainly mounted on a lens barrel, it is desired to use the metal material in order to pursue an integrated texture and design when the lens barrel is mounted. There are cases.

  However, mounting an accessory that uses a metal material on the lens barrel by the bayonet mechanism has the following problems.

  First, there is a problem that it is difficult to machine a minute and complicated click mechanism of an accessory from a metal material. Metal materials are processed into the desired shape by cutting, etc., but compared to resin materials processed by injection molding etc., the minute and complicated click mechanism of accessories used for optical equipment is processed by cutting metal materials etc. It is not easy to process by. Further, since the accessory to be mounted on the lens barrel has an annular shape as a whole, like the lens barrel, it is difficult to further machine the click mechanism into such a shape by cutting a metal material.

  Secondly, there is a problem that it is difficult to form the click mechanism with a metal material that is less elastically deformed. Since metal materials have a higher elastic modulus than resin materials, it is possible to obtain the target torque feeling and click feeling while maintaining strength when configuring the click mechanism with metal materials that have less elastic deformation. It will be difficult.

  Thirdly, when both the accessory and the lens barrel are made of a metal material, there is a problem that if they are attached by the bayonet mechanism, they are easily damaged. The bayonet mechanism is mounted by rotating the components to be mounted relative to each other so that the bayonet claws overlap each other, but if both are made of metal material, they will be damaged by sliding during relative rotation. It becomes easier.

  Therefore, even in an accessory that uses a metal material for its exterior member, the click mechanism needs to be made of a resin material.

  It is an object of the present invention to provide an accessory which has a good torque feeling and a click feeling when being attached and detached, and which can adopt a metal material for an outer appearance member, and which can be attached to a lens barrel by a bayonet mechanism. ..

  In order to solve the above problems, the present invention provides, in an accessory that can be mounted on a lens barrel by a bayonet mechanism, an annular member and a bayonet ring made of a resin material bonded to the annular member. In the ring, a bayonet claw is formed on the inner peripheral surface, a click portion is formed in the range in which the bayonet claw is formed, and a stopper portion is formed at one end in the range in which the bayonet claw is formed. Is a cantilever shape having an inclination with respect to the inner peripheral surface of the bayonet ring on a plane perpendicular to the optical axis, and the back surface support portion is formed in the radial direction around the optical axis, It is characterized in that the step portion is formed toward the axis.

  Advantageous Effects of Invention According to the present invention, it is possible to provide an accessory that has good torque feeling and click feeling at the time of attachment/detachment, can use a metal material for the appearance member, and can be attached to the lens barrel by the bayonet mechanism. .

Perspective view showing how the hood is attached to the lens barrel Cross-sectional view of the hood attached to the lens barrel when using the hood Sectional view with the hood attached to the lens barrel when the hood is stored Perspective view of the hood Exploded perspective view of the hood Enlarged sectional view of the hood Enlarged sectional view of the part where the click part is molded in the hood bayonet ring Sectional view when the hood is inserted Sectional view when rotating the hood Sectional view with hood attached

  Hereinafter, a hood that shields unnecessary light, which is an example of an accessory that can be attached to the lens barrel of the present invention, will be described with reference to the drawings.

  FIG. 1 is a perspective view showing how the hood of this embodiment is attached to the lens barrel, FIG. 2 is a sectional view of the hood attached to the lens barrel when the hood is used, and FIG. 3 is a hood when the hood is stored. FIG. 3 is a cross-sectional view in which is attached to a lens barrel. Note that, in FIGS. 2 and 3, the detailed structure of the lens barrel is omitted.

  In FIG. 1, 100 is a hood, 102a is a bayonet claw when the hood is used, 102c is a hood inner annular wall portion, 200 is a lens barrel, 201 is a lens barrel bayonet ring, and 201a is a lens barrel bayonet claw.

  When the hood is used, two sets of bayonet claws 102a and lens barrel bayonet claws 201a are arranged point-symmetrically about the optical axis.

  The hood 100 includes a hood ring, a hood bayonet ring, and a holding ring, which will be described later.

  The manner in which the hood 100 is attached to the lens barrel 200 by the bayonet mechanism will be described.

  First, the hood 100 is arranged along the optical axis direction of the hood 100 and the lens barrel 200 so that the bayonet claw 102a and the lens barrel bayonet claw 201a do not overlap in the circumferential direction about the optical axis when the hood is used. Then, the lens barrel bayonet ring 201 is inserted into the outer periphery thereof. At this time, the surface of the lens barrel bayonet claw 201a on the hood 100 side abuts the hood inner annular wall portion 102c, and movement of the hood 100 in the optical axis direction is restricted, so that the lens barrel bayonet ring of the hood 100 is restricted. The insertion into the outer periphery of 201 is completed.

  After that, when the hood 100 is completely inserted into the outer circumference of the lens barrel bayonet ring 201, the hood 100 is rotated about the optical axis until the bayonet claw 102a and the lens barrel bayonet claw 201a are overlapped when the hood is used. The mounting of the hood 100 on the lens barrel 200 is completed.

  In this embodiment, the hood 100 can be attached to the lens barrel 200 in the opposite direction along the optical axis direction during use and storage.

  FIG. 2 shows a cross-sectional view of the hood 100 mounted on the lens barrel 200 when the hood is used. When the hood of FIG. 2 is used, when the hood of the hood 100 is used, the bayonet claws 102a are coupled to the lens barrel bayonet claws 201a of the lens barrel 200, so that the hood 100 is attached to the lens barrel 200.

  FIG. 3 is a cross-sectional view showing a state in which the hood 100 is mounted on the lens barrel 200 when the hood is stored. When the hood is stored as shown in FIG. 3, the hood 100 is attached to the lens barrel 200 by coupling the bayonet claw 102b of the hood 100 when the hood is stored with the lens barrel bayonet claw 201a of the lens barrel 200. As shown in FIG. 3, since the hood 100 does not project from the lens barrel 200 when the hood is stored, portability and storage of the hood 100 and the lens barrel 200 as a whole are improved, and the hood 100 is prevented from being lost. be able to.

  At the time of using the hood and at the time of storing the hood, the bayonet claw 102a when the hood is used, which is the bayonet claw of the hood 100, and the bayonet claw 102b when the hood is stored, are used properly. Also commonly used in.

  FIG. 4 shows a perspective view of the hood 100, and FIG. 5 shows an exploded perspective view of the hood 100.

  The perspective view of FIG. 5 is shown in a state in which the hood 100 is cut in half in a plane parallel to the optical axis including the optical axis in order to easily confirm the shape of the inner peripheral surface of the hood 100.

  In FIG. 4, a hood bayonet ring 102, a bayonet claw 102a when the hood is used, a bayonet claw 102b when the hood is stored, and a hood inner annular wall portion 102c are formed on the inner peripheral surface of the hood 100. In addition to the shape related to the bayonet mechanism of these hoods 100, the shape related to the click mechanism is formed on the hood bayonet ring 102.

  In FIG. 4, 102g is a click part and 102h is a stopper part.

  The click part 102g of the hood 100 is a mechanism for giving an operator a torque feeling and a click feeling when the hood 100 is attached to or detached from the lens barrel 200 by the bayonet mechanism. Is also a mechanism as a stopper for preventing the lens from easily falling off the lens barrel 200. Further, the click portion 102g of the hood 100 is supported by the back surface supporting portion 102ga (not shown) in contact with the inner peripheral surface of the hood ring 101.

  Details of the click mechanism of the hood 100 and the operation at the time of attachment/detachment will be described later.

  In FIG. 5, 101 is a hood ring, 102 is a hood bayonet ring, and 103 is a holding ring.

  The hood 100 is composed of a plurality of parts as shown in FIG. 5, and particularly in this embodiment, the hood bayonet ring 102 is made of a resin material and the hood ring 101 is made of a metal material. The hood bayonet ring 102 is a component in which the shapes related to the bayonet mechanism and the click mechanism are molded and is made of a resin material because elastic deformation is required. Further, since the hood bayonet ring 102 is made of a resin material, even when the lens barrel bayonet ring 201 of the lens barrel 200 is made of a metal material, when the hood 100 is mounted on the lens barrel 200, the hood is not attached. It is possible to reduce the risk of damaging the lens barrel bayonet ring 201 that slides with the rotation of the bayonet ring 102. The hood ring 101 is a component that occupies most of the appearance member of the hood 100 and is made of a metal material because high strength and texture are required.

  The above configuration of the hood 100 will be described.

  The hood ring 101 is joined to the hood bayonet ring 102 by the pressing ring 103, so that the hood 100 has an integral structure.

  FIG. 6 shows an enlarged sectional view of the hood 100. Similar to FIG. 5, FIG. 6 is a diagram showing a cross section of a plane including the optical axis and parallel to the optical axis.

  As shown in FIGS. 5 and 6, the hood ring 101 is inserted outside the hood bayonet ring 102 so that the contact portion 101c contacts the flange portion 102e. When the hood ring 101 is inserted to the outside of the hood bayonet ring 102, the rotation stop notch 101d (not shown) formed in the hood ring 101 has a rotation stop protrusion 102f (not shown) formed in the hood bayonet ring 102. Inserted). As a result, the hood ring 101 is positioned relative to the hood bayonet ring 102 and rotation is stopped.

  Further, the pressing ring 103 is inserted outside the hood bayonet ring 102 so that the contact portion 103b contacts the flange portion 101b of the hood ring 101. At this time, the screwed portion 102d formed on the outer peripheral surface of the hood bayonet ring 102 and the screwed portion 103a formed on the inner peripheral surface of the presser ring 103 are screwed together, so that the hood bayonet ring 102 is And the hood ring 101 is joined. In this embodiment, a friction force is applied to the flat surface portion 103c of the pressing ring 103 using a jig to rotate the pressing ring 103 about the optical axis and screw it into the hood bayonet ring 102.

  FIG. 7 shows an enlarged cross-sectional view of a portion of the hood bayonet ring 102 where the click portion 102g is formed. FIG. 7 is a sectional view taken along a plane perpendicular to the optical axis including the click portion 102g of the hood bayonet ring 102.

  In FIG. 7, 102g is a click part, 102ga is a back support part, 102gb is a step part, 102gc is a slope charging part, and 102h is a stopper part. The click portion 102g is in the shape of a cantilever that projects so as to have an inclination with respect to the inner peripheral surface of the hood bayonet ring 102.

  8(a) to 8(c), after inserting the hood bayonet ring 102 of the hood 100 into the outer periphery of the lens barrel bayonet ring 201 of the lens barrel 200, the operator sets the hood 100 to the optical axis. An operation of rotating the lens barrel 200 by rotating it clockwise around the center will be described. 8A to 8C are cross-sections taken along a plane perpendicular to the optical axis including the hood 100 and the click portion 102g of the lens barrel 200 when viewed from the object side of the lens barrel 200 when the hood is used. It is a figure. It should be noted that the detailed mechanism of the lens barrel 200 is omitted in FIGS. 8A to 8C.

  In FIG. 8A, the hood 100 is arranged along the optical axis direction of the hood 100 and the lens barrel 200, and the bayonet claw 102a and the lens barrel bayonet claw 201a when the hood is used are circumferentially centered on the optical axis. The cross-sectional view of the lens barrel bayonet ring 201 is shown in FIG.

  In FIG. 8A, the bayonet claw 102a is not shown when using the hood, and the click portion 102g has a cantilever shape having an inclination with respect to the inner peripheral surface of the hood bayonet ring 102, but when using the hood. Since the click portion 102g is formed in the range where the bayonet claw 102a is formed, the lens barrel bayonet claw 201a does not interfere with the click portion 102g when the hood 100 is inserted into the lens barrel 200.

  Next, FIG. 8B shows a state in which the hood 100 is rotated clockwise about the optical axis from the state of FIG. 8A.

  In FIG. 8B, when the hood 100 is rotated clockwise around the optical axis, the click portion 102g and the stopper portion 102h of the hood 100 cause the lens of the lens barrel 200 to move in the circumferential direction around the optical axis. It approaches the lens barrel bayonet claw 201a.

  When the hood 100 is further rotated, the start end portion 201as of the lens barrel bayonet claw 201a comes into contact with the slope charging portion 102gc of the click portion 102g of the hood 100, and the lens barrel bayonet claw 201a rides on the click portion 102g of the hood 100. Like Actually, the click portion 102g of the hood 100 has an inclination with respect to the inner peripheral surface of the hood bayonet ring 102, and the back surface support portion 102ga is in contact with and supported by the inner peripheral surface of the hood ring 101, so that elastic deformation is caused. Since it is made of a resin material, the lens barrel bayonet claw 201a is given an elastic force.

  The elastic force from the click portion 102g of the hood 100 with respect to the lens barrel bayonet claw 201a gives a feeling of torque to the operator who rotates the hood 100, so that the operator can attach/detach the hood 100 to/from the lens barrel 200. It is possible to grasp it intuitively.

  FIG. 8C shows a state in which the hood 100 is rotated clockwise about the optical axis and is completely attached to the lens barrel 200.

  When the hood 100 is completely attached to the lens barrel 200, when the hood of the hood bayonet ring 102 is used, the stopper portion 102h formed at one end of the bayonet claw 102a (not shown) has a lens barrel bayonet claw of the lens barrel bayonet ring 201. When the start end portion 201as of the 201a hits, further rotation of the hood 100 about the optical axis is restricted, and at the same time, the end portion 201ae of the lens barrel bayonet claw 201a of the lens barrel bayonet ring 201 is moved to the hood bayonet ring 102. The hood 100 is prevented from easily falling off the lens barrel 200 by being fitted into the step portion 102gb of the click portion 102g. Immediately before the attachment of the hood 100 to the lens barrel 200 is completed, the stepped portion 102gb of the click portion 102g suddenly drops due to the elastic force to the terminal end portion 201ae on the opposite side of the starting end portion 201as of the lens barrel bayonet claw 201a. ..

  At the same time, at the same time, the hood bayonet ring 102 of the hood 100 is based on the terminal end portion 201ae of the lens barrel bayonet claw 201a, separately from the rotational force by which the operator rotates the hood 100 clockwise around the optical axis. An acceleration force is added, which causes the step portion 102ga of the click portion 102g to be rapidly pushed out in the same clockwise direction as the rotational force by the operator. Along with this, the stopper portion 102h of the hood bayonet ring 102 suddenly collides with the starting end portion 201as of the lens barrel bayonet claw 201a, which causes a click feeling, and the operator holds the hood 100 against the lens barrel 200. It is possible to intuitively grasp that it is completely worn.

  When removing the hood 100 from the lens barrel 200, in the state when the hood is attached as shown in FIG. It is rotated around and pulled out from the lens barrel bayonet ring 201. The end portion 201ae of the lens barrel bayonet claw 201a is fitted in the step portion 102gb of the click portion 102g, and the shape of each contact surface is inclined with respect to the radial direction about the optical axis. This makes it possible to appropriately set the operating force for rotation when removing the hood 100.

  The accessory that can be attached to the lens barrel according to the present invention is not limited to the hood for blocking unnecessary light in this embodiment. The present invention is also applicable to accessories that can be attached to a lens barrel, such as a lens cap, a filter, a front conversion lens, and a close-up lens.

  In the present embodiment, the hood bayonet ring of the hood and the lens barrel bayonet ring of the lens barrel have been described as being made of a metal material, but even if they are made of a resin material, a torque feeling and a click feeling that are the object of the present invention are obtained. It is possible to get.

  In the present invention, when the hood ring is connected to the hood bayonet ring, the hood ring may be directly fixed with a screw or an adhesive without using a separate member such as a holding ring.

  Advantageous Effects of Invention According to the present invention, it is possible to provide an accessory that has good torque feeling and click feeling at the time of attachment/detachment, can use a metal material for the appearance member, and can be attached to the lens barrel by the bayonet mechanism. ..

100 hood 101 hood ring 101a light shielding part 101b flange part 101c abutting part 101d rotation stop notch 102 hood bayonet ring 102a hood use bayonet claw 102b hood storage bayonet claw 102c hood inner annular wall part 102d screwing part 102e flange part 102f Rotation stop convex portion 102g Click portion 102ga Back surface support portion 102gb Step portion 102gc Slope surface charging portion 102h Stopper portion 103 Holding ring 103a Screwing portion 103b Abutting portion 103c Flat portion 200 Lens barrel 201 Lens barrel bayonet ring 201a Lens barrel bayonet Claw 201as Start end 201ae End end

Claims (5)

For accessories that can be attached to the lens barrel by the bayonet mechanism,
An annular member and a bayonet ring made of a resin material bonded to the annular member,
In the bayonet ring, a bayonet claw is formed on the inner peripheral surface, a click portion is formed within the range where the bayonet claw is formed, and a stopper portion is formed at one end of the range where the bayonet claw is formed.
The click portion has a cantilever shape having an inclination with respect to the inner peripheral surface of the bayonet ring on a plane perpendicular to the optical axis, and the back surface support portion is formed in the radial direction about the optical axis. The stepped portion is formed toward the optical axis. Furthermore, it has a retaining ring with threads formed on the inner peripheral surface,
The annular member is coupled to the bayonet ring by screwing a screw formed on the outer peripheral surface of the bayonet ring and a screw formed on the inner peripheral surface of the holding ring. The accessory according to Item 1.   One or more sets of the bayonet claw and the click portion formed on the inner peripheral surface of the bayonet ring are formed for use and storage of the accessory, and between the pair of the bayonet claw and the click portion. The accessory according to claim 1 or 2, wherein the inner peripheral annular wall portion is molded.   The accessory according to any one of claims 1 to 3, wherein the annular member is made of a metal material.   The accessory according to any one of claims 1 to 4, wherein the annular member is a hood for blocking unnecessary light.

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