JP6083982B2 - Optical equipment accessories and optical equipment - Google Patents

Description

  The present invention relates to an optical equipment accessory such as an interchangeable lens that is detachably attached to an optical equipment such as a camera.

  When a high voltage current such as static electricity charged by a user is applied to a camera having an internal electric circuit, the internal electric circuit may malfunction or be damaged. For this reason, it is configured to protect the electric circuit from high voltage current by connecting the exterior part of the camera body made of a conductive metal or the like to the ground part of the printed circuit board on which the electric circuit is mounted. There are many.

Further, in a lens barrel provided integrally with an interchangeable lens or a camera, the lens barrel member that holds the lens element may be formed of a resin material in which conductive metal or conductive carbon is mixed. . In this case, it is necessary to take measures against a lens barrel member when a high voltage current such as static electricity is applied. Patent Document 1 discloses a configuration in which an exterior cover that covers a lens barrel member is connected to a ground portion of a camera via a conductive relay member.
JP 2002-357757 A

  In an interchangeable lens, a metal exterior ring may be employed from the viewpoint of design. To attach the interchangeable lens to the camera body, the metal mount part (lens side mount part) provided on the interchangeable lens is connected to the metal mount part (camera side mount part) provided on the camera body. This is done by joining the bayonet. In the camera body, the camera side mount part is connected to the ground part together with the exterior part of the camera body as a countermeasure against static electricity, and for the interchangeable lens, the lens side mount part is coupled to the camera side mount part to prevent static electricity. It is done. For this reason, in the interchangeable lens, the metal outer ring and the lens side mount part are securely electrically connected, and the high voltage current applied to the outer ring is reliably transmitted via the lens side mount part and the camera side mount part. It is necessary to escape to the ground part.

  However, since the configuration using the relay member disclosed in Patent Document 1 is not a configuration for electrical connection between the exterior ring and the lens-side mount portion, it is difficult to use this as it is. Moreover, the configuration of Patent Document 1 is a complicated configuration using a relay member (a metal plate folded back in a U shape) formed in a special shape and a conductive member that contacts the exterior cover. Therefore, even if this configuration can be applied to an interchangeable lens, the interchangeable lens is increased in size.

  The present invention provides an optical equipment accessory such as an interchangeable lens that can reliably connect an exterior member and a mount member with a simple configuration.

An optical device accessory according to one aspect of the present invention has a mount surface that is detachably coupled to an optical device, can contact the optical device, and a back surface opposite to the mount surface. and, holding the mount member having conductivity, and the exterior surface is not parallel to the mounting surface, together with the the exterior surface and a opposite inner surface, an exterior member having conductivity, the exterior member a base member that, in the direction as viewed perpendicular to the direction in which the outer surface extends, wherein a first portion disposed between said inner surface and said base member of the outer member, and the rear surface of the mounting member base is provided between the member has a second portion which is bent with respect to said first portion, have a, a conductive member for electrically connecting the exterior member to said mounting member, said Guidance Member, an elastic member, and the mixed conductive material provided or elastic material on the outer surface of the elastic member has a conductive member of said inner surface and said mounting member of said outer member as pressed against the said back, said first portion is compressed between said inner surface and said base member of said outer member, said back and said base member of said second portion said mounting member It is characterized by being compressed between .

  An optical device such as a camera having an optical device-side mount member to which the mount member of the optical device accessory is detachably coupled and a ground portion to which the optical device-side mount member is electrically connected is also included in the present invention. The other one side is comprised.

  According to the present invention, an optical device such as an interchangeable lens that can reliably connect the exterior member and the mount member with a simple configuration and can connect the exterior member to the ground portion of the camera via the mount member. Accessories can be realized.

FIG. 3 is an enlarged cross-sectional view of the periphery of an exterior ring and a mount member in an interchangeable lens that is an embodiment of the present invention. Sectional drawing of the interchangeable lens of an Example. The perspective view which shows the external appearance of the interchangeable lens of an Example. The disassembled perspective view of the armor ring and mount member periphery in the interchangeable lens of an Example. The perspective view which shows the state which incorporated the electrically-conductive member in the exterior ring base in the interchangeable lens of an Example. FIG. 3 is an exploded cross-sectional view of the periphery of the exterior ring and the mount member in the interchangeable lens of Example. The figure which shows the interchangeable lens of an Example, and the camera with which this was mounted | worn.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 7 shows an interchangeable lens 100 as an optical equipment accessory according to an embodiment of the present invention, and a camera body (hereinafter simply referred to as a camera) as an optical equipment to which the interchangeable lens 100 is detachably mounted. 2 shows an outline of a camera system having 200.

  The camera 200 includes a chassis 201, a conductive metal camera-side mount member (optical device-side mount member) 202 fixed to the chassis 201, and a ground portion electrically connected to the camera-side mount member 202. Including a printed circuit board 203. The printed circuit board 203 is mounted with an electric circuit including a microcomputer and a memory for controlling various operations of the camera 200.

  A lens-side mount member (accessory-side mount member) 14 provided on the interchangeable lens 100 is bayonet-coupled to the camera-side mount member 202 so as to be removable. A flexible substrate 206 for ground wiring for electrically connecting them is extended between the camera side mount member 202 and the ground portion of the printed circuit board 203. By coupling (mounting) the lens side mount member 14 to the camera side mount member 202, the lens side mount member 14 is also electrically connected to the ground portion of the printed circuit board 203 via the camera side mount member 202.

  The above-described printed circuit board 203 is also mounted with an image sensor 204 constituted by a CMOS sensor or a CCD sensor. The image sensor 204 photoelectrically converts a subject image formed by the interchangeable lens 100 (imaging optical system), and an image processor (not shown) mounted on the printed circuit board 203 outputs a signal output from the image sensor 204. To generate an image. Reference numeral 205 denotes a rear monitor attached to the rear surface of the chassis 201, and displays a live view image and a captured image.

  FIG. 2 shows a detailed internal configuration of the interchangeable lens 100. X in the figure is an optical axis of a photographing optical system constituted by a plurality of lens groups described later. Reference numeral 1 denotes a first lens group, and 2 denotes a first lens barrel that holds the first lens group 1. Reference numeral 3 denotes a second lens group, and reference numeral 4 denotes a second lens barrel that holds the second lens group 3. Reference numeral 5 denotes a third lens unit. The first lens group 1, the second lens group 3, the third lens group unit 5 and other lens groups constitute a photographing optical system.

  Reference numeral 6 denotes a guide tube, and 7 denotes a cam ring which is disposed on the outer periphery of the guide tube 6 and is rotatable around the optical axis. Reference numeral 8 denotes a fixed barrel constituting the main body of the interchangeable lens. The fixed barrel 8 holds (fixes) the guide barrel 6 so as not to rotate around the optical axis.

  Each of the first lens barrel 2, the second lens barrel 4 and the third lens group unit 5 has a roller (not shown), and the roller includes a first lens barrel cam groove formed on the cam ring 7, a second mirror. The cylinder cam groove and the third lens group cam groove are engaged. Therefore, by rotating the cam ring 7 around the optical axis X (in the direction around the optical axis), the first lens barrel 2 (first lens group 1), the second lens barrel 4 (second lens group 3), and The third lens group unit 5 can be moved in the optical axis direction, which is the direction in which the optical axis X extends.

  Reference numeral 9 denotes a printed circuit board on which a lens driving IC and the like are mounted. The printed circuit board 9 is formed in a ring shape extending in the direction around the optical axis, and is attached to the rear portion (image surface side portion) of the fixed barrel 8.

  The lens side mount member 14 also shown in FIG. 7 is formed of a conductive metal such as brass, and is fixed to the rear end portion of the fixed barrel 8 with screws. As described above, the lens side mount member 14 is attached to the camera side mount member 202 by bayonet coupling.

  FIG. 3 shows the appearance of the interchangeable lens 100. Reference numeral 11 denotes a manual focus ring that is rotated by the user in the direction around the optical axis in order to cause the interchangeable lens 100 to perform focusing. Reference numeral 12 denotes a manual zoom ring that is rotated by the user in the direction around the optical axis in order to cause the interchangeable lens 100 to perform zooming.

  Reference numeral 13 denotes an exterior ring cover as a metal exterior member having conductivity. The exterior ring cover 13 is formed in a cylindrical shape having an outer peripheral surface (exterior surface) with the optical axis direction as the central axis. In other words, the outer surface of the outer ring cover 13 forms an outer surface that is not parallel to the mount surface 14 a of the lens side mount member 14. The mount surface 14 a is a surface formed in a ring shape, and is a surface that comes into contact with a ring-shaped mount reference surface that is the front end surface in the optical axis direction of the camera side mount member 202. Further, “not parallel to the mount surface 14a” includes not only the case of being orthogonal to the mount surface 14a as in the present embodiment but also the case of being inclined with respect to the mount surface 14a.

  Reference numeral 13 a denotes an attachment index formed as a recess at one place in the circumferential direction on the outer peripheral surface of the outer ring cover 13. The attachment index 13 a serves as a mark for determining the phase relationship between the mount members 14 and 202 when the interchangeable lens 100 is attached to the camera 200. The exterior ring cover 13 displays a lens name 13b, a zoom index 13c indicating a zoom position, and the like.

  In FIG. 4, the exterior ring cover 13 and the lens side mount member 14, the exterior ring base 31 as a base member for holding the exterior ring cover 13, and the exterior ring cover 13 and the lens side mount member 14 are electrically connected. This is an exploded view of the conductive member 15 for this purpose. FIG. 6 shows a cross section (optical axis direction cross section) along these optical axes. Further, FIG. 1A shows an enlarged part of FIG. 6, and FIG. 1B shows a state after the exterior ring cover 13 is attached to the exterior ring base 31. . FIG. 5 shows the appearance of the exterior ring base 31.

  The exterior ring base 31 is formed of, for example, a polycarbonate resin material in which conductive carbon fibers are mixed (added), and is disposed inside the exterior ring cover 13. The outer ring cover 13 is held by the outer ring base 31 by bonding the inner peripheral surface of the outer ring cover 13 to the outer peripheral surface of the outer ring base 31. On the other hand, the outer ring cover 13 is formed of an aluminum thin plate having a thickness of about 0.3 mm, for example.

  A portion corresponding to the back side of the mounting index 13 a described above on the inner peripheral surface of the outer ring cover 13 is formed as a convex portion, and a phase determining concave portion 31 a is formed at one circumferential direction of the outer ring base 31. When the outer ring cover 13 is assembled to the outer ring base 31, the phases of the convex portion of the outer ring cover 13 and the phasing concave portion 31 a of the outer ring base 31 are matched. Thereby, the phase relationship between the attachment index 13a and the zoom index 13c and the exterior ring base 31 can be determined with high accuracy.

  Furthermore, at one location in the circumferential direction of the exterior ring base 31, a shape that is bent 90 degrees so as to extend in the optical axis direction and a direction orthogonal thereto in the cross section in the optical axis direction shown in FIGS. A conductive member recess 31c is formed. As can be seen from FIG. 1 (b), the recess 31 c has an inner peripheral surface (inner surface) 13 b opposite to the outer surface of the outer ring cover 13 and a rear surface opposite to the mount surface 14 a of the lens side mounting member 14. 14b and a bent space is formed. The exterior ring base 31 is formed with a holding portion 31d extending so as to be stretched in the circumferential direction on the bent portion of the recess 31c.

  Note that the conductive member recess 31c does not necessarily have a shape bent at 90 degrees, and may be bent at an obtuse angle. Further, the “bending” in the present embodiment does not necessarily have to be bent (bent) so as to form a clear corner, and includes a case where it is smoothly bent (bent).

  The conductive member 15 is composed of an elastic material and a conductive material provided on the outer surface of the elastic material. For example, polyurethane is used as the elastic material, and its outer surface is preferably wrapped with a conductive cloth such as a conductive film made of polyimide coated with copper or conductive carbon fiber. Further, as the conductive member 15, a material obtained by mixing (adding) a conductive material to the inside (the whole) of the elastic material may be used.

  The conductive member 15 can be freely changed in shape because the elastic material can be deformed (bent or compressed), and good conductivity can be obtained by the conductive material. Such a conductive member 15 can be easily produced by cutting a tape-shaped conductive gasket sold as a general-purpose product into a required length, for example.

  As shown in FIGS. 1A and 6, the conductive member 15 is before the lens-side mount member 14 is attached to the fixed barrel 8 described above, and the exterior ring cover 13 is attached to the exterior ring base 31. Before, it inserts into the recessed part 31c for electrically-conductive members of the armored ring base 31. FIG. Thus, the conductive member 15 is fitted into the recess 31c while being bent along the shape of the recess 31c, and is held and held by the holding portion 31d. The lower surface of the conductive member 15 and the bottom surface of the recess 31c are attached with a double-sided tape 15a having conductivity. In this state, a part of the conductive member 15 protrudes from the recess 31c to the outer side in the radial direction (outer peripheral side) and the rear side in the optical axis direction (image plane side) of the exterior ring base 31.

  By forming the recess 31c for inserting the conductive member 15 in the outer ring base 31, the conductive member 15 can be easily positioned with respect to the outer ring base 31 during assembly. Further, by providing the outer ring base 31 with the holding portion 31d, the conductive member 15 can be provided even if the operator does not hold the conductive member 15 with a finger or a tool when the outer ring cover 13 is attached to the outer ring base 31. Can be prevented from being displaced or dropped. For this reason, assembly becomes easy.

  From the state shown in FIGS. 1A and 6, as shown in FIG. 1B, the lens side mount member 14 is attached to the fixed barrel 8, and the exterior ring cover 13 is attached to the exterior ring base 31. It is done. At this time, the portion of the conductive member 15 that protrudes radially outward of the exterior ring base 31 and the rear side in the optical axis direction is recessed by the inner peripheral surface 13 b of the exterior ring cover 13 and the back surface 14 b of the lens side mount member 14. It is pushed into 31c. In this way, the conductive member 15 is bent along the concave portion 31c and compressed (for example, compressed to be about half the original thickness), in the concave portion 31c, that is, in the space. Is housed in. As a result, due to the restoring force from the compressed state generated in the elastic member of the conductive member 15, the outer surface (conductive material) of the conductive material 15 becomes the inner peripheral surface 13 b of the outer ring cover 13 and the rear surface 14 b of the lens side mount member 14. And press. For this reason, the exterior ring cover 13 and the lens side mount member 14 are reliably electrically connected by the conductivity of the conductive member 15 (conductive material).

  In addition, when the exterior ring cover 13 is formed of an aluminum material, the surface thereof is often subjected to alumite treatment for the purpose of improving corrosion resistance or wear resistance. In this case, when the conductive member 15 is brought into contact with the inner peripheral surface 13b of the outer ring cover 13 as in the present embodiment, an alumite peeling process is required on the portion of the inner peripheral surface 13b where the conductive member 15 contacts. It becomes. At this time, the phase of the portion of the exterior ring cover 13 where the alumite peeling process is performed can be determined based on the attachment index 13a. Thereby, the phase with the part which performed the alumite peeling process among the electrically-conductive member 15 and the exterior ring cover 13 can be match | combined reliably and easily, and the conduction | electrical_connection defect between these can be avoided.

  As described above, according to the present embodiment, the metal outer ring cover 13 and the metal lens side mount member 14 are reliably electrically connected using the conductive member 15 that can be easily produced from a general-purpose product. can do. As described with reference to FIG. 7, the lens side mount member 14 is electrically connected to the ground portion of the printed circuit board 203 via the camera side mount member 202. Therefore, the exterior ring cover 13 is also electrically connected to the ground portion of the printed circuit board 203 through the camera side mount member 202 and the conductive member 15 and the lens side mount member 14. Therefore, a high voltage current generated by static electricity applied to the outer ring cover 13 flows in the electric circuit of the printed circuit boards 9 and 203 in the interchangeable lens 100 and the camera 200, and the electric circuit malfunctions or is damaged. You can avoid that.

  In this embodiment, the conductive member 15 is housed in the conductive member recess 31c in a compressed state, and is pressed against the outer ring cover 13 and the lens side mount member 14. As a result, a contact failure of the conductive member 15 to the exterior ring cover 13 and the lens side mount member 14 due to an impact applied to the interchangeable lens 100 from the outside or a change with time, that is, a poor conduction from the exterior ring cover 13 to the lens side mount member 14. Can be avoided.

  Although a method using a leaf spring instead of the conductive member 15 is conceivable, in order to obtain a sufficient pressure contact force between the outer ring cover 13 and the lens side mount member 14, the spring length is increased or a plurality of leaf springs are used. For example, an increase in size and complexity of the interchangeable lens becomes a problem. On the other hand, in this embodiment, since the conductive member 15 provided with a conductive material is used on the surface or inside (whole) of the elastic material, such an increase in size and complexity does not occur, and the interchangeable lens 100 Can be reduced in size and configuration.

  In the above embodiment, the case where the lens-side mount member 14 of the interchangeable lens 100 is directly attached to (coupled to) the camera-side mount member 202 of the camera 200 has been described. However, an intermediate adapter (optical device) (not shown) such as an extender or a mount conversion adapter may be coupled to the camera-side mount member 202, and the lens-side mount member 14 may be coupled to the mount member provided on the intermediate adapter. In this case, the outer ring cover 13 and the lens side mount member 14 are electrically connected to the ground portion in the camera 200 via the mount member of the intermediate adapter and the camera side mount member 202.

  Furthermore, in the above-described embodiment, the interchangeable lens 100 has been described as an optical device accessory. However, the present invention includes an optical device accessory other than the interchangeable lens such as the intermediate adapter and the external flash attached to the camera as another embodiment. .

  Each embodiment described above is only a representative example, and various modifications and changes can be made to each embodiment in carrying out the present invention.

  Camera accessories such as small interchangeable lenses with anti-static measures can be provided.

13 Exterior ring cover 31 Exterior ring base 31c Recess 14 Lens side mount member 15 Conductive member

Claims (4)

A mount member that is removably coupled to the optical device and has a mount surface that can contact the optical device; a back surface opposite to the mount surface; and a conductive mount member;
An exterior surface that is not parallel to the mount surface and an interior surface opposite to the exterior surface, and an electrically conductive exterior member;
A base member for holding the exterior member;
In the direction as viewed perpendicular to the direction in which the outer surface extends a first portion disposed between said inner surface and said base member of the outer member, between the rear and the base member of said mount member provided, a second portion which is bent with respect to the first portion, anda conductive member for electrically connecting the exterior member to said mounting member,
It said conductive member, said inner surface and said mounting elastic material and a conductive material or mixed in the elastic member provided on an outer surface of the elastic member has a conductive member is the outer member The first portion is compressed between the inner surface of the exterior member and the base member so as to be in pressure contact with the back surface of the member, and the second portion is An optical instrument accessory characterized in that it is compressed between a base member . Before SL base member, and characterized in that it has a recess, and a holding portion for holding the conductive member disposed in the recess in a state before the on the base member outer member and the mounting portion is attached The optical equipment accessory according to claim 1. It said base member is an optical apparatus accessory according to claim 1 or 2, wherein a conductive carbon is formed of a resin material mixed. An optical apparatus to which the optical apparatus accessory according to any one of claims 1 to 3 is mounted,
An optical device-side mount member to which the mount member is detachably coupled;
An optical apparatus comprising: the ground portion of the optical device side mount member is electrically connected, the.