JP3050892U - Lens adapter with built-in focus adjustment mechanism. - Google Patents

Abstract

(57) [Summary] (with correction) [Problem] Non-dedicated focal length for rangefinder linked camera 5
The present invention relates to an adapter having a built-in focus adjustment function for adjusting a focus by using an interlocking rangefinder that can be mounted with a screw-in intermediate spacer so that a 0 mm lens can be used. A focus adjustment is correctly performed with respect to a cam that operates with the same amount as the extension amount of a 50 mm focal length lens with a flange back correctly mounted, and the adapter 1 also has an extension amount on the object side. And the cam on the adapter 1 side that comes into contact with the interlocking rangefinder cam section on the camera side is extended by the same dimension. This cam is for a 50mm focal length lens with the flange back properly mounted,
This lens works with the interlocking rangefinder on the camera side. This lens has a different flange back for each mounting standard, so it is connected to this adapter 1 via an intermediate spacer necessary for correctly mounting the flangeback and connected to the camera and rangefinder. Linked focus adjustment becomes possible.

Description

[Detailed description of the invention]

[0001]

[Technical explanation to which the invention belongs]

 This device is a 35mm camera linked with a distance meter that uses a lens exchange mount with an aperture diameter of 39mm, a pitch of 1mm, and a flange back of 28.8mm, and a focal length with a non-dedicated mount for a Leica camera manufactured by Former West German Rights Company. This adapter is equipped with a 50 mm lens and has a built-in focus adjustment mechanism for adjusting the focus with the interlocking rangefinder of the Leica camera. In addition, this adapter requires an intermediate spacer that is indispensable for adjusting the focus of the lens but has a dimension to correct the flange back for each lens mount, but a female screw type to receive the required intermediate spacer A mount (opening diameter 41 mm, pitch 1 mm) is built in the opening on the object side. The link between the Leica camera's interlocking rangefinder and this adapter is based on the mechanism described below. The interlocking range meter of the Leica camera has a 50 mm focal length lens whose focus adjustment is correctly linked to a cam that operates with the same extension as the extension required for focusing. At this time, it is a matter of course that the 50 mm focal length lens must be properly adjusted for the flange back by the lens barrel or the intermediate spacer. With this adapter, the extension amount on the object side and the cam on the adapter side are extended by the same size and come into contact with the cam unit of the Leica camera to operate the interlock distance meter of the Leica camera. As a result, the distance meter interlocking cam of this adapter can accurately operate the interlocking distance meter of the Leica camera for a 50 mm focal length lens whose flange back is correctly adjusted by the intermediate spacer. This adapter uses a built-in helicoid structure to extend the lens and rangefinder interlocking cam. Lastly, a description will be given of the type of the intermediate spacer which is connected to the objective-side mount of the adapter and serves as a lens barrel for directly mounting a lens having a focal length of 50 mm to be used. The intermediate spacer plays the role of a lens barrel that compensates for the lack of dimensions such as the flange back when attaching a 50 mm focal length lens to the Leica camera and adapter. The following three types of intermediate spacers (a), (b) and (c) can be considered. The three types of intermediate spacers (a), (b), and (c) below have a mounting opening on the objective side for mounting the corresponding lens, and a diameter of 41 mm for connecting to an adapter on the opposite side. It has a male screw with a pitch of 1 mm, and has an appropriate barrel size with the flange back difference adjusted for the lens. (A) For Zuiko 50 mm lens for Olympus OM type SLR camera manufactured by Olympus Corporation. As shown in the drawing

FIG. The opening of the intermediate spacer is provided with a bayonet for receiving an Olympus OM mount lens. (B) For a male screw mount with a diameter of 42 mm, a pitch of 1 mm, and a flange back of 45,5 mm, that is, a 50 mm focal length lens of a screw-in mount for a plastic camera. As shown in the drawing

FIG. The opening is provided with a female screw type mount for receiving a lens having a diameter of 42 mm, a pitch of 1 mm, a flange back 45.5 mm, that is, a platinum mount. (C) Print enlargement lens manufactured by Nikon Corporation, for El Nikkor 50mm / f4 lens. As shown in the drawing

FIG. The opening is equipped with a female screw mount that accepts a 50 mm / f4 El Nikkor lens with a diameter of 39 mm, a pitch of 1 mm, a flange back of 44 mm, and 1 mm. As described above, the intermediate spacer shown in (a), (b), and (c) is connected to a female screw with a diameter of 41 mm and a pitch of 1 mm on the objective side of this adapter, and when attached to a Leica camera with this adapter, the corresponding lens is built into the Leica camera. The focus can be adjusted with the interlocking rangefinder to take a picture.

[0002]

[Conventional technology]

 Conventionally, there are the following types of adapters that are equipped with a 50 mm focal length lens with a non-dedicated mount for Leica cameras and have a built-in focus adjustment mechanism for adjusting the focus with an interlocked distance meter built into the Leica camera. . (B) An adapter for using a lens for a camera linked with a Contax distance meter from Zeiss Icon on a Leica camera. The only adapter that can be attached with the above adapter is the lens for the camera linked with the Contax distance meter from Zeiss Icon. Other lenses cannot be attached.

[0003]

[Problems to be solved by the invention]

 Except for the drawbacks, this model makes it possible to easily attach some of the non-dedicated photographic lenses that are currently available to consumers, such as single-lens reflex lenses and print enlargers, to the Leica camera. It is intended to take a picture with focus adjustment possible with a distance meter.

[0004]

[Means for Solving the Problems]

 The means for solving the problem will be described with reference to the drawings. (A) In order to mount a plurality of types of lenses with a focal length of 50 mm, the objective side mount opening 1 of the adapter of FIG. Replaceable screw mount. (B) A special intermediate spacer for mounting a lens having a predetermined focal length of 50 mm in the objective-side mount opening 1 is selected and mounted by screwing. (C) The three types of dedicated spacers shown in the figure are described below (d), (e) and (f). (D)

When the intermediate spacer of FIG. 5 is connected to the objective side of the focus adjustment mechanism built-in adapter of claim 1 with a screw mount, a Zuiko 50 mm lens for Olympus OM type SLR camera manufactured by Olympus Corporation is attached to the Leica camera. The focus can be adjusted with the distance meter on the camera camera side. In use, the Zuiko 50 mm helicoid is set at infinity. (E)

When the intermediate spacer of FIG. 6 is connected to the object side of the focus adjustment mechanism built-in adapter of claim 1 by a screw mount, the focus of the screw mount having a diameter of 42 mm, a pitch of 1 mm, and a flange back of 45.5 mm, that is, a focus of a plastic mount. A lens with a distance of 50 mm can be attached to a Leica camera, and the focus can be adjusted using a distance meter on the Leica camera. In use, the helicoid of the 50mm lens is set at infinity. (F)

When the intermediate spacer of Fig. 7 is connected to the objective side of the focus adjustment mechanism built-in adapter of claim 1 with a screw mount, an enlargement lens made by Nikon Corporation and an El Nikkor 50mm / f4 lens can be attached to the Leica camera. The focus can be adjusted using the Leica camera's rangefinder.

[0005]

[Embodiment of the invention]

 Since the present invention has the above-described structure, when using the same, first mount the adapter 1 on the objective mount side of the Leica camera by screwing. Then, on the objective mount side of the adapter 1, a dedicated intermediate spacer for each 50 mm focal length lens to be mounted.

FIG.

FIG.

FIG. 7 is mounted by screwing.

The intermediate spacer in FIG. 5 is exclusively for use with an OM Camera Mount Iiko 50 mm lens manufactured by Olympus.

FIG. 6 is an intermediate spacer dedicated to a platinum mount 50 mm lens.

FIG. 7 is an intermediate spacer for exclusive use with Nikon 50 mm / f4 print enlargement lens manufactured by Nikon. Next, a 50 mm focal length lens to be mounted is attached to the objective mount side of the intermediate spacer. If the helicoid for distance adjustment is mounted on the attached 50 mm focal length lens, set the helicoid at the infinity position. This completes the mounting of the 50 mm focal length lens to be mounted. The focus is then adjusted using the focus adjustment mechanism of the adapter itself. The objective mount of this adapter,

Rotate 1 in Figure 1 to focus and use the diaphragm The diaphragm built into the attached lens is used as it is.

[0006]

[Effect of the invention]

Conventionally, it was difficult to mount the camera on a Leica camera, and it was difficult to adjust the focus precisely in conjunction with the Leica camera's interlocking distance meter. The Zuiko 50mm lens and the Nikon enlargement lens El Nikkor 50mm / f4 can be used to adjust the focus using the Leica camera's interlocking rangefinder, making it easy to take pictures. (Note) Olympus, Contax and Nikon are registered trademarks in the detailed description of the invention.

[Brief description of the drawings]

FIG. 1 is a side view of an adapter.

FIG. 2 is a side view of components constituting an adapter, an objective mount, a distance meter interlocking cam, and a helicoid inner cylinder.

FIG. 3 is a side view of a part constituting an adapter and a helicoid outer cylinder.

FIG. 4 is a side view of parts constituting an adapter and a Leica camera mounting mount.

FIG. 5 is a side view of the intermediate spacer (a).

FIG. 6 is a side view of the intermediate spacer (b).

FIG. 7 is a side view of the intermediate spacer (c).

Fig. 8 For Leica camera

Figure 1 Adapter,

FIG. 5 is a side view of a state in which an intermediate spacer and an Olympus OM Zuiko 50 mm lens are used.

[Explanation of symbols]

(1) Intermediate spacer mounting screw part. Rotation operation unit for focus adjustment. (2) Adapter body. Helicoid outer cylinder. (3) Leica camera mounting screw section. (4) Distance meter interlocking cam. (5) Mounting screw part for mounting the intermediate spacer and the adapter. (6)

FIG. 5 is an intermediate spacer for a Zuiko lens. (7) Olympus OM mount Zuiko 50mm / f
1.4 lens. (8) A lens removal button for an Olimban OM mount 50 mm lens. (9) Leica camera body.

Claims (1)

[Utility model registration claims] 1. An intermediate device for mounting a Leica (registered trademark) camera linked to a distance meter, having a cam linked to a linked distance meter built into the Leica camera, and mounting a non-dedicated 50 mm focal length lens. A lens adapter with a built-in focus adjustment device that has a screw-in mount for receiving the spacer on the object side.