JPS61118733A - Adapter for camera mounting - Google Patents

Abstract

PURPOSE:To mount securely an adapter on a camera by allowing the adapter to be mounted on the camera only when a lens protection member is opened by an engagement part. CONSTITUTION:The adapter 8 for focal length conversion is mounted on the camera body 1 tightly and extremely easily while the photographic lens protection cover 7 is fully open. The length of a projection part 8a is nearly equal to the length of an arcuate recessed groove 3a which is exposed with the cover 7 fully open, and the width of the top and reverse surfaces of the adapter 8 is nearly equal to the extent of opening of the cover 7, so the projection part 8a can not be fitted in the arcuate recessed groove 3a unless the cover 7 is fully open. When the projection part 8a is fitted in said arcuate recessed groove, the focal length converting lens 9, finder compensating lens 10, projection lens compensating lens 11, and photodetection lens compensating lens 12 of the adapter 8 are positioned accurately and suitably for the photographic lens 2, finder 4, projection lens 5, and photodetection lens 6 of the camera 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in the mounting structure of an adapter mounted on a camera such as a focal length conversion optical system, filter, strobe, or underwater finder.

(Prior art) A focal length conversion adapter that is attached to the front of a photographic lens, automatic focusing optical system, etc. to enable telephoto shooting, close-up photography, etc.A focal length conversion adapter that is attached to the front of a photographic lens, metering window, etc. to enable filter photography, etc. There are various adapters that can be attached to the camera, such as special photography adapters that enable special photography, strobe attachment adapters that enable strobe photography, and underwater photography adapters that attach accessories for underwater photography such as an underwater finder. be. However, most of these adapters are installed by sandwiching the top and bottom surfaces of the camera body, so the size of the adapter needs to be at least larger than the vertical dimension of the camera, and for this reason, the shape of the adapter is large. There was a problem that it became In addition, in this case, since there is no horizontal positioning of the adapter relative to the camera body, 1.For example, with the above focal length conversion adapter,
There has been a problem in that the optical axes of the focal length conversion lenses in the focal length conversion adapter do not match, causing eccentricity and deteriorating optical performance.

(Summary of the Invention) The present invention has been made in view of the above-mentioned circumstances.
For a camera equipped with a lens protection member that is slidable in a second position that exposes a lens, the lens protection member is fitted with the camera body side guide portion only when the lens protection member is in the second position. By providing an adapter for mounting a camera in which the fitting part allows the lens protection member to be mounted on the camera only when the lens protection member is in the second position, the camera mounting adapter has an extremely compact shape and can be accurately and reliably mounted. Furthermore, the present invention aims to provide a camera attachment adapter that can be easily attached to a camera.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a camera mounting adapter according to the present invention and a camera to which the adapter is mounted. In Fig. 1, 1 is a camera body, 2 is a photographing lens built into the lens barrel 3, 4 is a finder, 5 and 6 are a light projecting lens and a light receiving lens, which constitute an AF optical system. . Reference numeral 7 denotes a photographic lens protection cover as a lens protection member, which is configured to be slidable between a first position where the front surface of the photographic lens 2 is covered and protected, and a second position where it is exposed. $
2 and 3 show the camera shown in FIG. 1 viewed from above, and FIG. 2 shows the photographing lens protective cover 7 in the closed position S (the first position M), Figure 13 shows the photographic lens protection cover 7 fully open! B (shape S, which is the second position) is shown. The photographic lens protection cover 7 is provided with guide bins 7a on the inner surface of the upper and lower surfaces, and the lens barrel portion 3
It fits into an arcuate groove 3a serving as a guide portion extending perpendicularly to the optical axis of the photographing lens 2 provided on the upper and lower outer surfaces of the lens. Support bins 3b are further provided on the upper and lower outer surfaces of the lens barrel portion 3.
is fitted into an arcuate groove 7b provided on the inner surface of the upper and lower surfaces of the photographic lens protection cover 7.Thereby, the photographic lens protection cover 7 is fitted with the guide bin 7a and the support bin 3b. It is designed to slide as a guide.

Incidentally, FIG. 4 shows the state when the photographic lens protection cover 7 is closed, and at this time the groove 3a is no longer visible from the outside.

Returning to Figure 1, 8 is a focal length conversion adapter that is used as a camera attachment adapter, and is approximately U-shaped.
It is made of an elastic material such as synthetic resin. The focal length conversion adapter 8 has a focal length conversion lens 9 approximately at the center of the front surface. The viewfinder correction lens is located further above the U-shape.
O1 light projection lens correction lens 11. A light receiving lens correction lens 12 is fixed. Reference numeral 8a designates a protrusion as a fitting portion provided on the U-shaped upper and lower inner surfaces of the focal length conversion adapter 8 and extending in a direction perpendicular to the optical axis of the focal length conversion lens 9; Shooting lens protection cover 7
With the focal length conversion adapter 8 fully open, bend the focal length conversion adapter 8 so that its top and bottom surfaces open vertically, and attach the camera body 1.
When inserted into the camera body 1, the protrusion 8a fits into the L-shaped arc groove of the lens barrel 3, so that the focal length conversion adapter 8 is firmly and extremely easily inserted into the camera body 1. It will be installed. Further, the length of the protrusion 8a is approximately equal to the length of the arcuate member tR3a exposed when the photographing lens protection cover 7 is fully opened, and the width of the upper and lower surfaces of the focal length conversion adapter 8 is Since the opening amount is approximately equal to the opening amount of the lens protection cover 7, when the photographic lens protection cover 7 is not fully opened, the protrusion 8a
does not fit into the arc-shaped groove 3a, and when the protrusion 8a fits into the arc-shaped groove, the photographic lens 2. of the camera l. Finder 4. Projection lens 5. For each of the light receiving lenses 6, attach the focal length conversion lens 9 of the focal length conversion adapter 8 to an appropriate position. Finder correction lens 10, floodlight correction lens 11. The light receiving lens correction lens 12 is accurately positioned. This also allows you to attach the adapter without fully opening the lens protection cover (which is generally the case with cameras where the release lock is applied when the lens protection cover is not fully open). This can also prevent erroneous operations such as accidentally causing the user to miss a valuable photo opportunity.

(Effects of the Invention) As explained above, the present invention provides a lens protection member that is guided by the camera body side guide section and is slidable between a first position for protecting the lens and a second position for exposing the lens. A fitting part is provided that fits with the camera body side guide part only when the lens protection member is in the second position, and the fitting part allows the lens protection member to move to the second position. This camera attachment adapter is designed to be attached to the camera only when the camera is in the position shown in the figure, so it can be made into an extremely compact camera attachment adapter, and it can be attached to the camera accurately, reliably, and easily. It can be used as an adapter for mounting a camera, and its effects are extremely high.

In the above embodiment, a focal length conversion adapter is shown as an adapter for attaching to a camera, but any adapter attached to a camera, such as an adapter for special photography, an adapter for attaching a strobe, an adapter for underwater photography, etc., as described above may be used. It goes without saying that the present invention can be applied to any type of device and the same effects as described above can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a camera mounting adapter according to the present invention and a camera to which the adapter is mounted;
Figure 2 is a top view showing the camera lens protection cover shown in Figure 1 in an open state, Figure 3 is a top view showing the same camera lens protection cover in a closed state, and Figure 4 is the same camera lens protection cover. FIG. 3 is a perspective view showing a closed state. 1-111 camera body 2-111 photographic lens 3--
--- Lens barrel part 3a --- One concave groove 4 --- Finder 5-11 Light projecting lens 6 --- Light receiving lens

Claims (1)

[Claims] The first lens is guided by the guide section on the camera body side and protects the lens.
For a camera equipped with a lens protection member that is slidable between a position of 1. An adapter for attaching to a camera, characterized in that a fitting portion is provided, and the lens protection member is attached to the camera only when the lens protection member is in the second position.