JP2018189669A - Camera with camera mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera with a resin-made camera mount that allows an image capturing lens to be removably mounted, which allows smooth mounting and dismounting of an image capturing lens without causing a user to feel stiffness in mounting of the image capturing lens.SOLUTION: A camera mount (10) provided on a camera (100) that allows an image capturing lens to be removably mounted thereto is disclosed, the camera mount (10) being made of a resin material and having latching sections (10z) for latching an image capturing lens to the camera mount (10) concavely formed at multiple points thereon, where the latching sections (10z) are positioned to avoid screw fixing sections (10a, 10b, 10c, 10d, 10e, 10f) for fixing the camera mount (10).SELECTED DRAWING: Figure 1

Description

  The present invention relates to an interchangeable lens camera having a lens mounting mount, and more particularly to a camera having a camera mount made of a resin material.

A bayonet mount has been proposed as a lens attaching / detaching mechanism of an interchangeable lens camera in which a taking lens can be replaced. Hereinafter, a bayonet-type mount member provided in the camera is described as a camera mount.

  Conventional camera mounts with interchangeable lenses are made of metal materials in consideration of durability, reliability, accuracy, etc. However, camera mounts made of metal materials are heavy and costly. There was a problem of becoming.

  In recent years, a camera body having a camera mount made of a resin material such as plastic has been commercialized due to improvement in durability and reliability of engineering plastics and progress in molding technology. By making the camera mount a resin material, it is possible to reduce the weight and reduce the cost of parts. Patent Document 1 discloses a camera mount made of resin.

JP-A-11-64701

  However, since the camera mount disclosed in Patent Document 1 is formed of a resin material, there is a problem in that the strength of the mount is inferior to a camera mount made of metal. For example, the mount fixing member that fixes the camera mount with screws etc. has a box shape and high rigidity compared to the camera mount, so when the mount fixing member deforms, the camera mount deforms the mount fixing member It will follow the shape.

  Since the optical viewfinder unit and the AF unit are configured above and below the conventional mount fixing member, opening holes are formed above and below the mount fixing member. The strength near the opening hole is lowered by the opening hole, so that the vicinity of the opening hole is easily affected by the expansion / contraction due to the change of the temperature environment. For example, when the temperature environment is low, shrinkage deformation occurs so that the upper and lower sides of the mount fixing member having the opening holes are warped inward.

  The camera mount is pulled by deformation of the mount fixing member so that the upper and lower sides of the mount fixing member warp inward, and the inner periphery of the camera mount is deformed into an elliptical shape and the inner diameter becomes smaller. The feeling of wearing with will be awkward. Also, when a camera mount made of a resin material is screwed to the mount fixing member, the screw fixing portion of the camera mount may be deformed in a direction to reduce the inner diameter of the camera mount, and the feeling of wearing the photographic lens may be awkward .

  Accordingly, an object of the present invention is to allow the photographic lens to be attached and detached, and in a camera having a camera mount made of a resin material, the photographic lens can be smoothly attached without being awkward to attach the photographic lens. Is to provide a camera.

In order to achieve the above object, a camera according to the present invention provides:
A camera mount provided in a camera in which a photographic lens can be attached and detached, wherein the camera mount is made of a resin material, and a fitting portion of the camera mount with the photographic lens is formed to be convex at a plurality of locations, The fitting portion is arranged at a position avoiding the screw fixing portion for fixing the camera mount.

  According to the present invention, in a camera having a camera mount that can be attached to and detached from a photographic lens and is made of a resin material, a camera that can smoothly attach the photographic lens without causing troublesome mounting of the photographic lens. Can be provided.

1 is an external front view of a camera 100 according to an embodiment of the present invention. It is the perspective view which looked at the mount fixing member 11 concerning embodiment of this invention from the bottom face side. It is the perspective view which looked at the mount fixing member 11 concerning embodiment of this invention from the upper surface side. It is a figure which shows the shrinkage deformation direction of the mount fixing member 11 under the low temperature concerning embodiment of this invention. It is an appearance perspective view showing enlarging a part of camera mount 10 concerning the embodiment of the present invention. It is the FIG. 4A section enlarged view of camera mount 10 'comprised with the conventional metal material. It is the FIG. 4A section enlarged view of the camera mount 10 comprised with the resin material concerning embodiment of this invention. It is a figure which shows the position of the fitting part 10z arrange | positioned at three places in the camera mount 10 concerning embodiment of this invention. It is a figure which shows the position of the fitting part 10z arrange | positioned at six places in the camera mount 10 concerning embodiment of this invention.

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

  FIG. 1 is an external front view of a camera 100 according to an embodiment of the present invention.

  In FIG. 1, 100 is a camera, 10 is a camera mount, and 11 is a mount fixing member. The camera mount 10 is fixed to the mount fixing member 11 by a plurality of screw fixing portions 10a, 10b, 10c, 10d, 10e, and 10f. Conventionally, when the camera mount 10 is made of a highly rigid metal material, the four screw fixing portions 10 a, 10 b, 10 c, and 10 d are fixed to the mount fixing member 11.

  Since the camera mount 10 of the present invention is made of a resin material, the strength and rigidity of the individual camera mount 10 are reduced as compared with a metal material. As an adverse effect due to the decrease in strength and rigidity, there is a deflection of the camera mount 10 due to the weight of the photographing lens when the photographing lens is attached to the camera mount 10. In the camera posture of FIG. 1, when a heavy photographic lens is attached, a load is applied to the camera mount claw 10i of the camera mount 10, and the deflection near 10e is increased. In order to suppress the deflection of the camera mount 10, two screw fixing portions 10e and 10f are added in the embodiment of the present invention.

  The surface of the camera mount 10 has camera mount surfaces 10g and 10h that face the reference surface of the lens mount provided on the photographic lens. A reference surface for defining a flange back is formed on the camera mount surfaces 10g and 10h.

  Three camera mount claws 10 i, 10 j, and 10 k are formed on the inner periphery of the camera mount 10. When the photographic lens is mounted, the lens mount is inserted into the camera mount 10 with the index position of the photographic lens aligned with the corresponding lens mounting index of the camera mount, and the reference plane of the photographic lens mount is brought into contact with the reference plane of the camera mount. This is done by rotating the lens by a predetermined angle.

  The camera mount 10 is provided with a lens lock pin 13 for restricting the rotation operation when the photographic lens is mounted. In the lens mounting state, the lens lock pin 13 engages with a lock hole formed at a predetermined position of the lens mount to restrict the rotation of the lens, and the camera mount claws 10i, 10j, and 10k correspond to the lens mount of the photographing lens. Engage with the claw part.

  A spring member is arranged on the back side of the camera mount claws 10i, 10j, and 10k, and the claw portion of the engaged lens mount is pulled in so that the reference plane of the photographic lens mount and the reference plane of the camera mount contact each other. Hold.

  When removing the lens, by depressing the lens lock release button 14 of the camera, the lens lock pin 13 is retracted from the camera mount surface 10g, 10h, and the lens is rotated by a predetermined angle in the direction opposite to that when the lens is mounted. Do.

  The camera 100 also includes a mirror unit 20 that is rotated by an actuator (not shown), and the mirror unit 20 is incorporated in the mount fixing member 11.

  2A is a perspective view of the mount fixing member 11 according to the embodiment of the present invention as viewed from the bottom surface side, and FIG. 2B is a perspective view of the mount fixing member 11 according to the embodiment of the present invention as viewed from the top surface side. FIG.

  In FIG. 2A, an upper opening hole 11u is formed on the upper side of the mount fixing member 11 in order to arrange an optical finder unit (not shown). In FIG. 2B, a lower opening hole 11b is also formed on the lower side of the mount fixing member 11 in order to arrange an AF unit (not shown). Thus, in the camera 100 including the mirror unit 20, opening holes are formed substantially above and below the mount fixing member 11 in order to secure an optical path to the optical viewfinder and the AF unit. The strength near the opening hole is lowered by the opening hole, so that the vicinity of the opening hole is easily affected by the expansion / contraction due to the change of the temperature environment.

  FIG. 3 is a view showing a shrinkage deformation direction of the mount fixing member 11 at a low temperature according to the embodiment of the present invention.

  Even in the case of a resin material or a metal material, if there is a change in temperature environment, the material expands and contracts, and the material contracts at a low temperature. Although the mount fixing member 11 of this embodiment employs a resin material, the opening fixing holes 11u and 11b are formed substantially above and below the mount fixing member 11, so that the strength is higher than that of the left wall 11L and the right wall 11R. Therefore, vertical contraction is likely to occur at low temperatures. U1 and B1 in FIG. 3 indicate shrinkage deformation directions of the mount fixing member 11 at a low temperature. When the camera mount 10 is made of a resin material, the strength of the material becomes weaker than that of the metal, and the screw fixing portions 10e and 10f are additionally arranged to suppress the deflection of the mount. The camera mount 10 follows the directions U1 and B1. As a result, the camera mount 10 is deformed into an elliptical shape, and the inner diameter of the camera mount 10 is reduced by the deformation.

  FIG. 4 is an external perspective view showing that a part of the camera mount 10 is enlarged. FIG. 5A is an enlarged view of a portion of FIG. 4A of a camera mount 10 ′ made of a conventional metal material, and FIG. 5B is a view of the camera mount 10 made of a resin material according to the embodiment of the present invention. It is an enlarged view of a 4A section.

  In FIG. 5A, the fitting portion 10z ′ on the inner diameter of the camera mount 10 ′ made of the conventional metal material is formed in a continuous circular shape as shown by the hatched portion, and the photographing lens is attached. At this time, it is in a relationship of fitting with the lens mount. On the other hand, the fitting portion 10z on the inner diameter of the camera mount 10 made of the resin material shown in FIG. 5B in FIG. 5B is not a continuous circular shape like the shaded portion, but partially. It has a limited shape. Further, portions other than the fitting portion 10z are not fitted with the lens mount of the photographing lens like the escape portion 10f, and the shape is escaped so as not to contact.

  FIG. 6A is a diagram showing the positions of the fitting portions 10z arranged at three positions on the camera mount 10 according to the embodiment of the present invention, and six positions are arranged at the camera mount 10 according to the embodiment of the present invention. It is a figure which shows the position of the fitting part 10z.

  In FIG. 6A in which the fitting portion 10z shows three camera mounts 10, the fitting portion 10z is disposed between the screw fixing portions 10a and 10e, 10b and 10f, 10c and 10d. Also in FIG. 6B, the fitting portion 10z is disposed between each of the screw seat surfaces 10a, 10b, 10c, 10d, 10e, and 10f. The fitting portion 10z is arranged avoiding the screw fixing portions 10a to 10f because the screw fixing portions 10a to 10f are crushed when the camera mount 10 is fixed to the mount fixing member 11 in the mount inner diameter direction. This is to avoid the influence of deformation. By doing so, even if the tightening torque for fixing the screw is high and the condition is more disadvantageous for deformation, the fitting portion with the lens mount of the photographing lens is arranged at the position corresponding to the screw fixing portion 10a to 10f. Therefore, the photographing lens mounting operation can be performed smoothly. Further, the fitting portions 10z are arranged at three or more locations so that the lens mount and the position of the photographing lens having a circular shape are determined when the photographing lens is mounted. The fitting portion 10z avoids the camera mount 10 from being substantially vertically arranged to make it less susceptible to the shrinkage deformation of the camera mount 10 shown in FIG. 3 at a low temperature. At least one place is arranged in the direction. Further, the fitting portion 10z is arranged at an equiangular position from the optical center Z1 in order to suppress the deviation of the position of the photographing lens with respect to the optical axis center Z1 of the camera mount 10 when the photographing lens is mounted.

  Furthermore, as shown in FIGS. 6a and 6b, the fitting portion 10z is formed in a partially limited shape, so that, conventionally, the driving of the component dimensions must be performed in a continuous circular shape. Since it is only necessary to drive the shape, it is easy to drive the dimensions of the parts.

  As described above, in the camera 100 having the camera mount 10 made of a resin material, the fitting lens 10z is provided at a position avoiding the screw fixing portions 10a, 10b, 10c, 10d, 10e, and 10f. In this case, the attaching / detaching operation does not become heavy. Accordingly, it is possible to provide a camera that can be mounted smoothly.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

10 Mount member,
10a, 10b, 10c, 10d, 10e, 10f Screw fixing part,
10z fitting part, 100 camera

Claims (6)

  A camera mount provided in a camera in which a photographic lens can be attached and detached, wherein the camera mount is made of a resin material, and a fitting portion of the camera mount with the photographic lens is formed to be convex at a plurality of locations, The camera is characterized in that the fitting portion is disposed at a position avoiding the screw fixing portion for fixing the camera mount.   The camera according to claim 1, wherein at least one of the upper and lower sides of the mount fixing member is screw-fixed.   3. The camera according to claim 1, wherein a fitting portion of the camera mount with the photographing lens is configured at three or more locations.   The at least one place of the fitting part with the said photographic lens of the said camera mount is arrange | positioned in either the right or left of the same height as the optical axis center, The one of Claim 1 thru | or 3 characterized by the above-mentioned. Camera described in.   The camera according to any one of claims 1 to 4, wherein the fitting portion of the mount member with the photographing lens is disposed at an equal angle from the center of the optical axis.   The camera according to any one of claims 1 to 5, wherein the camera and the photographing lens constitute a bayonet-type mounting mechanism.