JP2015031727A - Lens interchangeable-type camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens interchangeable camera capable of stable electric signal communication between a lens and a camera by controlling relative positional deviation from a mount part to an imaging part and relative positional deviation from the mount part to a contact unit within prescribed ranges by a simple method and reliably fixing the contact unit.SOLUTION: A contact unit including a connection terminal of a camera body contacting with a connection terminal of an interchangeable lens is fixed by a screw from the rear surface of an image unit holding member, and thereby an optical axis direction of the contact unit is fixed relative to the imaging unit holding member. A part where the contact unit is fixed to the imaging unit holding member is in a region where the mount part is projected in the optical axis direction.

Description

  The present invention relates to a lens mounting mount of an interchangeable lens camera.

  2. Description of the Related Art Conventionally, there is an interchangeable lens type camera in which a lens is exchanged according to an application such as taking a telephoto, a close-up photograph, or a photograph with special effects. Such a camera includes an imaging unit that converts light taken from a lens into an electrical signal. It is necessary to ensure a predetermined positional accuracy between the lens and the imaging unit. That is, the camera side must keep the positional accuracy from the mount unit to the imaging unit within a predetermined range. In addition, some cameras are provided with a bayonet-type mount that, after a substantially cylindrical lens is pushed into a contact position, is rotated and locked by a predetermined angle about the optical axis as a rotation axis. . A plurality of connection terminals for performing signal communication with the camera body are provided on the surface of the lens facing the camera. On the other hand, the camera side is provided with a connection terminal at a position where it abuts with the lens side connection terminal when the lens is mounted. When the lens is mounted, the lens side connection terminal and the camera side connection terminal are joined to perform electrical signal communication. It can be carried out. The camera side connection terminal is arranged at a position closer to the imaging unit from the camera side mount unit by the length of the lens side mount unit in the optical axis direction. The camera can perform lens drive control such as zooming and autofocus via electrical signal communication.

  The plurality of connection terminals are supplied as a contact unit integrated with resin material parts on both the lens side and the camera side in order to simplify the assembling work. It is desirable that the contact unit is composed of a precise group of parts and is not directly fixed to the mount portion in order not to directly transmit an external force from the lens. Also, in order to stabilize electrical signal communication, it is necessary to reduce the relative displacement between the lens-side connection terminal and the camera-side connection terminal. On the camera side, the mounting accuracy for mounting the lens and the position accuracy of the contact unit are ensured. Must have been.

  In recent years, with the reduction in the connection terminal pitch accompanying the miniaturization of the interchangeable lens camera and the increase in the number of signals due to the increase in the number of lens functions, higher positional accuracy is required between the mount unit and the contact unit.

  With respect to this problem, there is a conventional lens interchangeable camera that includes a contact unit that is positioned with respect to a mount portion (see, for example, Patent Document 1).

  Hereinafter, a conventional lens interchangeable camera will be described with reference to FIGS.

  FIG. 17 is an exploded perspective view showing the internal structure of the interchangeable lens camera according to the prior art. FIG. 18 is an exploded perspective view showing the internal structure of the interchangeable lens camera according to the prior art viewed from another direction. Reference numeral 8 denotes a mount portion, 9 denotes a contact unit, and 10 denotes an imaging unit holding member. The contact unit 9 is floatingly held on the imaging unit holding member 10 with a screw 9-2 via a rubber bush 9-1. The position in the plane orthogonal to the optical axis direction of the contact unit 9 is determined by fitting the boss 8-1 provided in the mount portion and the hole 9-3 provided in the contact unit 9. Since the contact unit 9 is held floating by the rubber bush 9-1, the contact unit can be moved to a position where the boss 8-1 and the hole 9-3 are fitted when the mount portion 8 is assembled.

JP2011-75697A

  However, in the lens interchangeable camera according to the related art, the contact unit freely moves with respect to the imaging unit holding member, so that the relative position between the connection terminal provided on the contact unit and the lens connection terminal is shifted and the connection is established. Not stable. That is, the contact unit must be securely fixed to the imaging unit holding member.

  In recent years, as shown in FIGS. 19 and 20, there is a camera in which the mirror 19 that guides the light taken from the optical finder 20 and the interchangeable lens 11 to the optical finder 20 is abolished to reduce the size of the camera. In the case of such a camera, as shown in FIG. 21, since the shutter unit 14 is disposed immediately behind the contact unit 13, the region 13-2 where the connection terminal 13-1 can be disposed captures the contact unit 13. The length of the screw fixed to the unit holding member 15 cannot be secured.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lens interchangeable camera that suppresses the relative positional deviation from the mount unit to the imaging unit and the relative positional deviation from the mount unit to the contact unit within a predetermined range by a simple method. is there. It is another object of the present invention to provide a lens interchangeable camera that can securely fix a contact unit and perform stable electrical signal communication between the lens and the camera.

  In order to achieve the above-described object, the interchangeable lens camera according to the present invention includes a contact unit having a connection terminal of a camera body that is in contact with a connection terminal of an interchangeable lens. An optical axis direction is fixed with respect to the imaging unit holding member, and a portion where the contact unit is fixed to the imaging unit holding member is in a region projected in the optical axis direction of the mount portion.

  Another feature of the present invention is that the direction of the contact unit and the imaging unit holding member perpendicular to the optical axis is respectively positioned with respect to the mount unit, and the light of the mount unit and the contact unit is measured. Each of the directions along the axis is positioned with respect to the imaging unit holding member.

  Another feature of the present invention is that a boss is provided on one of the contact unit and the imaging unit holding member, and the other is configured coaxially with the boss, and has a hole larger than the diameter of the boss. It is characterized by that.

  According to the present invention, it is possible to provide a lens interchangeable camera that can suppress the relative positional deviation from the mount unit to the imaging unit and the relative positional deviation from the mount unit to the contact unit within a predetermined range by a simple method. Can do. In addition, it is possible to provide a lens interchangeable camera that can securely fix the contact unit and perform stable electrical signal communication between the lens and the camera.

Perspective view showing the camera body and interchangeable lens Conceptual diagram showing the mount lock pin and unlock member provided on the camera body A perspective view showing an interchangeable lens A perspective view showing a state in which an interchangeable lens is mounted on the camera body. The figure showing that the mount lock pin and the unlocking member are interlocked Perspective view showing the camera body Exploded perspective view of the internal structure of the camera The exploded perspective view which looked at the internal structure of the camera from other directions Rear view showing temporary positioning of contact unit and imaging unit holding member Diagram showing clearance between contact unit and mount The perspective view which shows the procedure which fixes a contact unit to an imaging unit holding member The perspective view which shows the procedure which fixes a shutter unit to an imaging unit holding member. The perspective view which shows the procedure which carries out floating support of the imaging unit to an imaging unit holding member Exploded perspective view of imaging unit The perspective view which looked at the imaging holding member from the image sensor side Conceptual diagram showing the cause of displacement from the mount to the imaging unit Exploded perspective view showing the internal structure of the interchangeable lens camera according to the prior art Another exploded perspective view showing the internal structure of the interchangeable lens camera according to the prior art The exploded perspective view of the internal structure of a camera concerning 2nd prior art Another exploded perspective view of the internal structure of the camera according to the second prior art The exploded perspective view which looked at the internal structure of the camera concerning 2nd prior art from another direction

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  Hereinafter, with reference to FIG. 1 to FIG. 16, a lens interchangeable camera according to an embodiment of the present invention will be described.

  FIG. 1 is a perspective view showing an interchangeable lens and a camera according to an embodiment of the present invention. Reference numeral 1 denotes an interchangeable lens, in which a zoom mechanism, a camera shake correction mechanism, and the like are mounted according to the specifications of the interchangeable lens 1. A mount portion 3 is provided on the front surface of the camera body 2. The mount portion 3 has an annular shape having an opening 3-1 at the center, and a mount lock pin 4-1 protruding toward the objective side is provided on the circumferential portion. Reference numeral 2-1 denotes a lock release button. FIG. 2 is a conceptual diagram showing the relationship between the mount lock pin 4-1 and the lock release button 2-1. The mount lock pin 4-1 is biased forward of the camera body 2 by a coil spring 4-1-2, and can be slid rearward by pressing the lock release button 2-1. The user aligns the lens side index 1-1 with the main body side index 3-2, pushes the interchangeable lens 1 in the direction of arrow A to a position where it abuts the mount portion 3, and then rotates the lens side index 1-1 in the direction of arrow B by a predetermined angle. The interchangeable lens 1 can be attached to the camera body 2 with a bayonet structure. That is, the interchangeable lens 1 is positioned by the mount opening 3-1 and is restricted by the mount lock pin 4-1.

  FIG. 3 is a perspective view of the interchangeable lens 1 as viewed from the side facing the camera body 2. 1-2 is a lens side mount corresponding to a known bayonet structure, and 1-2-1 is a mount lock hole. The mount lock hole 1-2-1 is fitted into the mount lock pin 4-1 described above when the mount lock hole 1-2-1 is attached to the camera body 2. 1-2-2 is a portion of a lens connection terminal for performing signal communication with the camera body.

  FIG. 4 is a perspective view showing a state in which the interchangeable lens 1 is attached to the camera body 2. The interchangeable lens 1 is restricted from rotating with respect to the camera body 2 when the mount lock pin 4-1 engages with a mount lock hole 1-2-1 provided on the imaging-side mount portion contact surface. When removing the interchangeable lens 1, the lock release button 2-1 is pushed. As shown in FIG. 5, the lock release button is interlocked with the mount lock pin 4-1, and the rotation restriction between the mount lock pin 4-1 and the mount lock hole 1-2-1 is released. After rotating in the “direction”, the lens may be moved in the direction of arrow A ′.

  FIG. 6 is a perspective view showing the camera body 2. The contact unit 4 is exposed in the opening 3-1 of the mount 3. The contact unit 4 is provided with a cylindrical recess having a size capable of accommodating the lens-side mount portion 1-2. The lens-side connection terminal 1-2-2 is mounted on the bottom surface of the recess when the interchangeable lens 1 is mounted. A plurality of camera side connection terminals 4-2 are arranged at positions where they abut. When the lens is mounted, the lens side connection terminal 1-2-2 and the camera side connection terminal 4-2 contact each other, so that the camera body 2 shares power to the interchangeable lens 1 and performs signal drive control for lens drive control. I do.

  7 and 8 are exploded perspective views showing the internal structure of the camera. FIG. 7 is a perspective view as viewed from the mount portion side, 3 is the above-described mount portion, 4 is a contact unit, 5 is an imaging unit holding member, 6 is a shutter unit, and 7 is an imaging unit. FIG. 8 is an exploded perspective view of only the mount portion 3, the contact unit 4, and the imaging unit holding member 5 as viewed from another direction. Hereinafter, the internal structure will be described in the order of assembly. Reference numerals 4-3 and 4-4 are a pair of bosses provided in the contact unit 4. The image pickup unit holding member 5 is provided with a hole 5-1 and a long hole 5-2 which are hole portions at positions which are coaxial with the bosses 4-3 and 4-4 and substantially coincide with the projection surface in the optical axis direction. . The boss and the hole may be on either one or the other of the contact unit 4 and the imaging unit holding member 5. As shown in FIG. 9, the hole 5-1 and the long hole 5-2 are sized so as to have a minute clearance 5-3 with respect to the bosses 4-3 and 4-4. The contact unit 4 is assembled to the imaging unit holding member 5 with the mount portion 3 facing upward so that the surface orthogonal to the optical axis C can move within the clearance 5-3. At this time, the contact unit 4 is in a position where the screw seat surface 4-5 and the screw hole opening 5-4 abut each other with respect to the imaging unit holding member 5 in the optical axis direction C. The screw seat surface 4-5 and the screw hole opening 5-4 are provided at positions overlapping the optical axis direction C projection region of the mount portion 3.

  Two pairs of holes and long holes (3-4 and 3-5, 3-6 and 3-7) are provided on the back surface 3-3 of the mount portion 3. The imaging unit holding member 5 is provided with a pair of positioning bosses 5-5 and 5-6. Further, the contact unit 4 is provided with a pair of positioning bosses 4-6 and 4-7, and a chamfer 4-8 is provided at the tip. The mount portion 3 is assembled so that the pair of the hole 3-4 and the long hole 3-5 of the mount portion 3 is fitted to the pair of positioning bosses 5-5 and 5-6 of the imaging unit holding member 5, respectively. Then, in the contact unit 4, the chamfer 4-8 comes into contact with the hole 3-6 of the mount 3 and the edge 3-8 of the long hole 3-7, and the bosses 4-6 and 4-7 are holes of the mount 3. It moves to the position which fits 3-6 and the long hole 3-7. That is, the contact unit 4 and the imaging unit holding member 5 are strictly positioned with respect to the mount portion 3 with respect to the plane orthogonal to the optical axis C. The mount unit 3 is in a position where the back surface 3-3 of the mount unit 3 abuts against the screw seat surface 5-7 of the imaging unit holding member 5 with respect to the optical axis direction C. However, as shown in FIG. 10, there is a clearance 4-9 between the mount 3 and the contact unit 4, and the contact unit 4 can move freely within the range of the clearance 4-9. When the mount unit 3 is assembled, the mount unit 3 can be smoothly moved to the fitting position between the hole 3-6 and the long hole 3-7 without being sandwiched between the mount unit 3 and the imaging unit holding member 5. Further, since the clearance 4-9 is provided, the mount portion 3 can be firmly fixed to the imaging unit holding member 5 with the screws 3-9 without sandwiching the contact unit 4. Thereafter, the subunit including the imaging unit holding member 5, the contact unit 4, and the mount unit 3 is turned over so that the side on which the imaging unit 7 is assembled faces upward. At this time, since the mount portion 3 is already fixed, the contact unit 4 does not fall off. As shown in FIG. 11, the contact unit 4 is fixed to the imaging unit holding member 5 by screws 4-10 from the imaging unit 7 side. Therefore, in the camera state, an external force applied to the mount unit 3 from the interchangeable lens 1 (not shown) or the like is not directly transmitted to the contact unit 4. Further, since the screws are fixed from the imaging unit 7 side, the inside of the annular shape of the mount portion 3 can be used as an area for arranging the connection terminals without being occupied by the screws.

  Thereafter, as shown in FIG. 12, the shutter unit 6 is positioned on the imaging unit holding member 5 and fixed with screws 6-1. Thereafter, as shown in FIG. 13, the imaging unit 7 is positioned by fitting the positioning hole 7-1 and the positioning boss 5-8 provided in the imaging unit holding member 5, and the coil spring 7-2 and the screw 7- 3 is held floating.

  FIG. 14 is an exploded perspective view of the imaging unit 7. 7-4 is an image sensor, and 7-5 is an image sensor holding member. FIG. 15 is a perspective view of the image sensor holding member 7-5 as viewed from the image sensor 7-4 side. The image sensor 7-4 is positioned by fitting a positioning hole 7-4-1 and a positioning boss 7-5-1 provided in the image sensor holding member 7-5, and the image sensor 7-4 is screwed to the image sensor holding member 7-5. It is fixed at 7-6. 7-4-2 is an imaging unit that converts light incident from the interchangeable lens 1 (not shown) into an electrical signal, and is fixed to the positioning hole 7-4-1 with a predetermined positional accuracy.

  That is, as shown in the conceptual diagram 16, while the contact unit 4 and the mount unit 3 are directly positioned, the components that are misaligned from the mount unit 3 to the imaging device 7-4-2 are represented by the mount unit 3 and the imaging unit holding member. 5. Only the image sensor holding member 7-5 and the image sensor 7-4 are used. By doing so, the positional accuracy from the mount part 3 to the imaging part 7-4-2 can be ensured.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included.

DESCRIPTION OF SYMBOLS 1 Interchangeable lens 1-2-2 Lens connection terminal 2 Camera body 3 Mount part 4 Contact unit 4-2 Camera side connection terminal 5 Imaging unit holding member 7 Imaging unit

Claims (3)

  The contact unit having the connection terminal of the camera body that contacts the connection terminal of the interchangeable lens is fixed with the screw from the back surface of the imaging unit holding member so that the optical axis direction is fixed to the imaging unit holding member. The lens interchangeable camera characterized in that the portion where the unit is fixed to the imaging unit holding member is in a region projected in the optical axis direction of the mount portion.   The direction perpendicular to the optical axis of the contact unit and the imaging unit holding member is positioned with respect to the mount part, respectively, and the direction along the optical axis of the mount part and the contact unit is the imaging unit holding member, respectively. The interchangeable lens camera according to claim 1, wherein the interchangeable lens camera is positioned relative to the camera.   The boss is provided in one of the contact unit and the imaging unit holding member, and the other is configured to be coaxial with the boss, and has a hole portion larger than the diameter of the boss. Interchangeable lens camera.

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