JP2018040998A - Camera attachment accessory for lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount a lens built-in type second camera whose photographing field angle is wider than a first camera relative to the lens interchangeable first camera in such a way that an interchangeable lens of the first camera is not photographed and optical axis directions of two optical systems run parallel.SOLUTION: A camera attachment accessory is proposed that can mount a lens interchangeable first camera, an interchangeable lens that can be mounted on the first camera, and a second camera having an optical system that can obtain a photographing field angle that is wider than the photographing field angle by the first camera and the interchangeable lens. An engaging section capable of engaging with a tip of the interchangeable lens, a central axis of the engaging section, and a central axis of an optical system of the second camera are provided in parallel in order that the optical axis of the interchangeable lens and the central axis match.SELECTED DRAWING: Figure 1

Description

  The present invention proposes attachment means for attaching the second camera to the lens barrel of the first camera.

  In recent years, digital cameras and digital video cameras having a main optical system and a secondary optical system specialized for the wide-angle side in one camera have been developed. The digital camera and digital video camera can shoot a subject using a main optical system at the time of moving image shooting and shoot a wide area around the subject using a sub optical system. Further, as in Patent Document 1, it is possible to assist the introduction of the subject of the main optical system using the image of the sub optical system.

  In recent years, an action camera specialized in wide-angle shooting has been developed that is small in size. By using it together with an interchangeable lens camera capable of high-quality shooting, the above-mentioned main optical system and sub optical system are integrated. High-quality shooting is possible compared to cameras. Furthermore, since the lens can be exchanged, the photographing area can be enlarged.

JP 2012-239135 A

  However, when mounting a small and specialized second-angle camera on the interchangeable-lens camera, if the interchangeable lens has a long overall length, the second camera is wide-angled so that the interchangeable lens does not fall within the angle of view. There is a problem that the image captured by the second camera is vignetted.

  If the optical axis direction of the interchangeable lens camera and the optical axis direction of the second camera do not match, it is difficult to introduce a subject to be photographed simultaneously by the two cameras if there is only one photographer. Further, it cannot be used as a subject introduction assist.

  As a means for adjusting the positions of the two cameras, there has been proposed a means for adjusting the connection portion with two degrees of freedom as in JP 2012-239135. However, the optical axes of the two cameras are manually adjusted. It is necessary to adjust and adjust.

  As means for solving the above-mentioned problems, a first camera, a lens barrel provided in the first camera, and an optical system capable of obtaining a shooting angle of view wider than the shooting angle of view of the first camera are provided. It is possible to attach two cameras, an engaging portion that can be engaged with the tip of the interchangeable lens so that the optical axis and the central axis of the interchangeable lens coincide, and the central axis of the engaging portion and the second axis A camera mounting accessory is provided, characterized in that the camera optical system is provided so that the central axes thereof are parallel to each other.

  According to the present invention, the second camera and the first camera can be mounted in parallel in the optical axis direction without causing vignetting on the interchangeable lens of the interchangeable lens camera to the second camera. .

Overall view of Embodiment 1 of the present invention Partial sectional view of Example 1 of the present invention Overall view of Embodiment 2 of the present invention Partial sectional view of Example 2 of the present invention Rear perspective view showing an example of mounting the second camera Rear perspective view showing an example of mounting the second camera

  Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 shows a first camera 1, which is an embodiment of the present invention, an interchangeable lens 2 mounted on the first camera 1, a hood member 3 mounted on the interchangeable lens 2, and a second The camera 4 is shown.

  As shown in FIG. 2, the interchangeable lens 2 attached to the first camera 1 includes a lens group 21 disposed on the most object side of the interchangeable lens 2 and a front lens frame 22 that holds the lens group 21. The front lens frame 22 is provided with a bayonet portion 201 and an engaging portion 202 for attaching and detaching the hood member 3 for preventing unwanted rays from entering the interchangeable lens 2 without blocking the rays within the angle of view. The center of the engaging portion 202 is provided so as to coincide with the optical axis of the interchangeable lens 2.

  Next, the hood member 3 and the second camera 4 will be described with reference to FIG. The second camera 4 is constituted by an optical system capable of photographing a wider angle of view than that obtained when the interchangeable lens 2 is attached to the first camera 1.

  The hood member 3 is provided with an engaging claw 302 for mounting on the interchangeable lens 2. The engaging claw portion 302 is disposed so as to engage on the circumference of the fitting portion 202, and the bayonet portion 201 causes the engaging claw portion 302 to coincide with the optical axis of the interchangeable lens 2. It is possible to engage. The optical axis of the optical system of the second camera 4 is provided so that the central axis of the engaging claw portion 302 is parallel to the axial direction. Therefore, it can be mounted so that the optical axis of the optical system of the second camera 4 and the optical axis of the interchangeable lens 2 are parallel.

  Since the second camera 4 is attached in front of the interchangeable lens 2 by the hood member 3, it can be fixed at a position where no vignetting occurs in the light beam within the shooting angle of view. A simplified model of rays within the angle of view of the hood member 3, the interchangeable lens 2, and the second camera 4 is shown in FIG.

  According to this embodiment, it is possible to mount the second camera 4 so that the light is not vignetted by the interchangeable lens 2 mounted on the first camera 1 and the optical axis is parallel to the interchangeable lens 2. It becomes possible.

  In the present embodiment, the second camera 4 is provided integrally with the hood member 3. However, as shown in FIG. 5, the rotation stopper 304, the insertion positioning surface 305, and the second camera fitting portion 306 are provided on the hood member 3 side. When the second camera 4 is made detachable, the optical axes of the interchangeable lens 2 and the second camera 4 can be made parallel.

  Furthermore, as shown in FIG. 6, the second camera 4 can be attached and detached by providing a mounting plane 307 parallel to the optical axis, a positioning pin 308, and a mounting screw 309, and the interchangeable lens 2 and the second camera 4 Can be made parallel to each other.

  Hereinafter, two embodiments of the present invention will be described with reference to the drawings. FIG. 3 shows a first camera 1 according to an embodiment of the present invention, an interchangeable lens 2 mounted on the first camera 1, and a second camera holding member 5 mounted on the interchangeable lens 2. The second camera 4 is shown.

The interchangeable lens 2 attached to the first camera 1 shown in FIG. 3 has a front lens frame 22 that holds a lens group 21 that is disposed closest to the objective side of the interchangeable lens 2.
As shown in FIG. 4, the lens frame 22 is provided with a female screw portion 203 for mounting a protective filter for protecting the lens group 21, and the central axis of the female screw portion 203 is the center of the lens group 21. Coincides with the axis.

  Next, the second camera holding member 5 and the second camera 4 will be described with reference to FIG. The second camera 4 is constituted by an optical system capable of photographing a wider angle of view than that obtained when the interchangeable lens 2 is attached to the first camera 1.

  The second camera holding member 5 is provided with a male screw portion 503 for mounting on the female screw portion 203 of the interchangeable lens 2. By engaging the male screw portion 503 with the female screw portion 203 of the interchangeable lens 2, it is possible to engage so that the central axis of the male screw portion 503 and the optical axis of the interchangeable lens 2 coincide with the central axis. The optical axis of the optical system of the second camera 4 is provided so that the axial direction is parallel to the central axis of the male screw portion 503. Therefore, it can be mounted so that the optical axis of the optical system of the second camera 4 and the optical axis of the interchangeable lens 2 are parallel.

  Since the second camera 4 is attached in front of the interchangeable lens 2 by the second camera holding member 5, it can be fixed at a position where no vignetting occurs in the light beam within the shooting angle of view. FIG. 4 shows a simplified model of the light within the angle of view of the second camera holding member 5, the interchangeable lens 2, and the second camera 4.

  According to this embodiment, it is possible to mount the second camera 4 so that the light is not vignetted by the interchangeable lens 2 mounted on the first camera 1 and the optical axis is parallel to the interchangeable lens 2. It becomes possible.

  Each embodiment described above is described using an interchangeable lens, but the lens barrel and the camera may be integrated. Further, each of the embodiments described above proposes means for mounting the second camera 4 so that the light beam is not vignetted and the interchangeable lens 2 and the optical axis are parallel to each other. It is various, and it is possible to simultaneously shoot moving images with different angles of view, simultaneously shoot still images with different angles of view, and simultaneously shoot moving images and still images. Furthermore, when introducing a subject to a subject that is difficult to introduce with a telephoto lens, it can be used as an assist when shooting with the first camera, and it is difficult to predict sports, birds, children, etc. This is effective for subjects that

  The present invention relates to an accessory that can be attached to an interchangeable lens.

1. First camera
2. Interchangeable lens
3. Hood parts
4. Second camera
5. Camera holding member
21. Lens group
22. Front lens frame
201. Bayonet club
202. Engagement part
203. Female thread
302. Engagement claw
304. Rotation stop
305. Insertion positioning surface 305
306. Second camera fitting part
307. Mounting plane
308. Positioning pin
309. Mounting screw
503. Male thread

Claims (6)

A first camera, a lens barrel provided in the first camera, and a second camera having an optical system capable of obtaining a shooting angle of view wider than that of the first camera and the lens barrel. The engaging portion engageable with the tip of the lens barrel, the central axis of the engaging portion, and the optical system of the second camera so that the optical axis and the central axis of the lens barrel coincide with each other. A camera mounting accessory having a mounting portion with a central axis provided in parallel. The camera mounting accessory according to claim 1, wherein the engaging portion is formed in a bayonet shape. The camera mounting accessory according to claim 1, wherein the engaging portion is formed in a screwed shape. The second camera is detachable;
The camera mounting accessory according to claim 1, wherein a rotation restricting shape for restricting rotation about the optical axis of the second camera is provided. The second camera is detachable;
The camera mounting accessory according to claim 1, wherein a restriction shape for restricting a position in an optical axis direction of the second camera is provided. The second camera is detachable;
The camera mounting accessory according to claim 1, further comprising a flat portion for receiving the second camera on a flat surface and a screw member for fixing the second camera.