JP3210586B2 - Camera system and intermediate adapter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera system in which a camera body, an interchangeable lens and an intermediate adapter having the same mount have a fixed back focus or less. And an intermediate adapter.

[0002]

2. Description of the Related Art Conventionally, in a camera system of this type, when the mount shape of a camera body and an interchangeable lens is common to each other, the interchangeable lens and the camera body can be mounted even if the back focus is different. is there. In rare cases, in the case of wide-type interchangeable lenses, the back focus is short and the rear end of the interchangeable lens may hit the mirror of the camera body. It is customary.

[0003] In such a camera system, the mount itself may be renewed and changed in order to make use of the characteristics of the interchangeable lens.

On the other hand, Japanese Utility Model Laid-Open No. 25435/1993 discloses that even though the basic mount shape is almost the same, the mutual bayonet mount claw of the intermediate adapter and the interchangeable lens that can be mounted is attached to
A camera system having a projection and a notch is disclosed.

Japanese Patent Application Laid-Open No. 63-48539 discloses an example in which a blocking means for blocking mounting of an intermediate optical device on an interchangeable lens other than a specific interchangeable lens is provided.

[0006]

However, in the above-mentioned prior art, even if the back focus of the camera body is short (for example, about 38 mm from the film surface), the interchangeable lens can be mounted, and the camera cannot be used. When the photographer uses the mirror up when hitting the mirror, there is a risk that the mirror of the camera is damaged due to the carelessness of the photographer, and the photographing itself is restricted.

On the other hand, depending on the manufacturer's convenience, the back focus is short (for example, from 30 mm back focus).
Changing the conventional mount itself, including the position of the metal back, in order to prepare a large number of interchangeable lenses wastes the conventional camera system. The disadvantage is great for the manufacturer.

The invention of Japanese Utility Model Laid-Open No. 25435/1993 discloses a case in which a projection and a notch are provided on a mutual bayonet mount claw of an interchangeable lens that can be mounted on an intermediate adapter, that is, on the basis of whether the intermediate adapter and a specific lens can be mounted. Because there is
This can be handled by partially changing the shape of both mounts at the same time. However, in the case of a camera body and an interchangeable lens, if the basic mount shape is the same, the new camera body can be fitted with all interchangeable lenses, and the old camera body can not be fitted with only a specific lens It is difficult.

In Japanese Patent Application Laid-Open No. 63-48539, there is provided a blocking means for preventing the mounting of the intermediate optical device on an interchangeable lens other than a specific interchangeable lens. Although it is possible, the structure of whether or not the intermediate optical device and the camera body can be mounted is not disclosed, and even the necessity is not described.

[0010]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, a metal back from a mount reference surface to a film surface has the same size and a body-side mount has the same shape. And a second camera body, a plurality of interchangeable lenses having a common lens-side mount that engages with the body-side mount, and a plurality of intermediate adapters connected between the camera body and the interchangeable lens;
A camera system having a, the first camera body, as is possible the mounting of any of the intermediate adapter, the inside of the body-side mount has an escape portion for mounting a range between adapters in them, It said second camera body is in to allow mounting of <br/> between adapters that have a certain level of back focus, have a flange portion inside the body side mounting, certain dimensions following Bakkufo
An intermediate adapter having a focus is provided on the second camera body.
If you try to attach it to the
Interferes with the flange inside the side mount,
The fixing projection that prevents
The fixing projection is provided on the inner diameter side of the und,
Intermediate for connecting to the body-side electrical contact provided on the mount
It is a protection member for protecting the adapter-side electrical contact .

[0011] The second aspect of the present invention is the camera system according to claim 1, wherein the protective member, when attached to the camera body, a buffer unit to buffer contact between the components of the camera body Is provided.

[0012] The invention according to claim 3, in an intermediate adapter for use in a camera system including a second camera body having a flange portion of the inner body-side mount to only interchangeable lens mountable with at least a certain back focus There is an intermediate with a back focus below a certain dimension
When the adapter is to be mounted on the second camera body, the adapter interferes with the flange portion inside the body-side mount when the mount is mounted, and prevents the mounting projection from being fixed.
The intermediate adapter between the body coupling mount and the optics
The fixing projection is provided on the body-side mount.
Intermediate adapter-side electricity to be connected to the provided body-side electrical contacts
It is a protection member for protecting the contact .

According to a fourth aspect of the present invention, in the intermediate adapter according to the third aspect, when the protective member is attached to the first or second camera body, the first or second protective member is attached to the first or second camera body.
A buffer portion for buffering the contact with a component member on the camera body side.

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION

(Camera System) FIGS. 1 to 12 are sectional views showing a main part of an embodiment of a camera system according to the present invention.
FIGS. 13 and 14 are cross-sectional views showing the first and second interchangeable lenses of the present embodiment. FIG. 19 is a sectional view and a side view showing another embodiment of the first interchangeable lens. FIG.
5 and FIG. 16 are sectional views showing the first and second camera bodies of the present embodiment. FIG. 17 and FIG. 18 are cross-sectional views showing the first and second intermediate adapters of the present embodiment. FIG. 20 is a sectional view and a side view showing another embodiment of the first intermediate adapter. The camera system of this embodiment includes first and second interchangeable lenses 10, 20, first and second camera bodies 30, 40, and first and second intermediate adapters 50, 80. . The first interchangeable lens 10 has a short back focus (back focus 3
(Approximately 0 mm to 38 mm) (refer to FIGS. 1, 3, 5, 5, 7, 9, 11, 13, and 19). Second
The interchangeable lens 20 is a lens having a long back focus (about 38 mm or more in back focus) (see FIGS. 2, 4, 6, 6, 8, 10, 12, and 14). First
Camera body 30 includes first and second interchangeable lenses 1
0, 20 and the first and second intermediate adapters 50, 80 (FIGS. 1 to 4, 9, and 1).
0, see FIG. 15). The second camera body 40 is provided with a second interchangeable lens 2 having a back focus above a certain level.
0 and a body that can only be mounted with a second intermediate adapter 80 that can be mounted only on this interchangeable lens 20 (FIG. 5).
To FIG. 8, FIG. 11, FIG. 12, and FIG. The first intermediate adapter 50 is an adapter to which the first and second interchangeable lenses 10 and 20 can be attached (see FIGS. 1, 2, 5, 5, 6, 17, and 20). Second intermediate adapter 80
Is an adapter that can be attached only to the second interchangeable lens 20 having a certain back focus or more (see FIGS. 3, 4, 7, 8, and 18).

Hereinafter, the first and second interchangeable lenses 10, 2 will be described.
0, the first and second camera bodies 30, 40,
The detailed structure of the second intermediate adapters 50 and 80 will be described.

(First Interchangeable Lens) FIG. 13A is a sectional view schematically showing an interchangeable lens 10 having a short back focus C (back focus of about 30 mm to 38 mm). The interchangeable lens 10 has the optical systems 1 and 2 in a lens barrel. The metal back A is the distance from the film surface 100 to the mount reference surface 101. G is the distance between the rear end portion 10a of the lens and the mount reference plane 101.

FIG. 13B is a view of the interchangeable lens 10 as viewed from the rear of the lens-side mount 3. In the lens side mount 3, bayonet mount claws 3a and mount openings 3b are alternately arranged. The lens mount 3 is
A second camera body 40 is provided between the inner side and the optical system 2.
The fixing projection 10a is provided so as to interfere with the flange portion 141a (see FIG. 16) of the mounting member when the mount is mounted.
The lens-side mount 3 is provided with a flat portion 10b between the inner diameter side and the optical system 2 and at a position one step lower than the fixing protrusion 10a.

(Second Interchangeable Lens) FIG. 14A is a sectional view schematically showing an interchangeable lens 20 having a long back focus B (about 38 mm or more in back focus).
The interchangeable lens 20 has the optical systems 21 and 22 in a lens barrel. The metal back A has the same length as the interchangeable lens 10. F is the distance between the rear end portion 20a of the lens and the mount reference plane 101.

FIG. 14B is a view of the interchangeable lens 20 viewed from behind the lens mount 3. The lens-side mount 3 has bayonet mount claws 3 a and mount openings 3 b alternately arranged, and has the same shape as the mount of the interchangeable lens 10.

(First Camera Body) FIG. 15 is a sectional view showing the first camera body 30. The first camera body 30 includes a body-side mount 130. The body side mount 130 is provided with the bayonet mount claw 13
0a and the mount openings 130b are alternately arranged, and have the same shape as the body-side mount 140 of the second camera body 40. First camera body 30
Is compatible with an interchangeable lens having a shorter back focus than the second camera body 40 described later, so that the shape of the mirror 31 is slightly smaller than that of the first body 40, and the mirror 31 approaches the film surface 100. I have.

The body side mount 130 has a rear portion,
The camera body 30 has a fixed portion which also serves as a mirror box 131. As shown in FIG.
A flat concave portion 131a is formed around 1. In order to avoid interference with the portion behind the lens-side mount 3 of the interchangeable lens 10 having a short back focus, the flat concave portion 131a is configured to avoid a protrusion at the inner diameter of the lens-side mount 3 when the lens is mounted. Part. E is a dimension from the body-side mount reference surface 102 to the flat concave portion 131a. The trajectory of the mirror 31 passes through the film surface side from the flat concave portion 131a.

(Second Camera Body) FIG. 16 is a cross-sectional view showing the second camera body 40. The second camera body 40 includes a body-side mount 140. The body-side mount 140 is a bayonet mount claw 14
0a and the mount openings 140b are alternately arranged. The body-side mount 140 has a fixing portion that also serves as a mirror box 141 of the body at a rear portion thereof. As shown in FIG. 16A, a flat flange portion 141a is formed on the right side and an upper portion of the mirror 41. ing. D is
Flat flange part 1 from body side mount reference plane 102
The dimensions are up to 41a. The trajectory of the mirror 41 passes through the film surface side from the flat flange portion 141a.

(First Intermediate Adapter) FIG. 17 is a sectional view showing a first intermediate adapter 50 according to the present embodiment. The first intermediate adapter 50 is an adapter to which all interchangeable lenses can be attached. In the present embodiment, the first intermediate adapter 50 has an optical system 51 in a lens barrel and is used as a teleconverter for expanding the focal length of the lens. ing. Intermediate adapter 5
Reference numeral 0 denotes a body coupling mount 70 for mounting on a camera body on the body side of the main body, and a lens coupling mount 60 for mounting on an interchangeable lens is provided on the opposite side. The back focus J of the intermediate adapter 50 is short (about 30 mm to 38 mm back focus) so that all the interchangeable lenses can be mounted. Here, the distance A from the film surface 100 to the mount reference surface 103 is called a metal back. Further, the distance between the rear end portion 50b of the lens and the mount reference plane 103 is represented by I.

FIG. 17A shows the first intermediate adapter 50.
It is the figure seen from the front of. The lens coupling mount 60 is
Bayonet mount claw 60a and mount opening 60b
And are alternately arranged. At the rear of the mount 60,
There is a flange portion 50a, and the dimension from the mount reference surface 104 to the flange portion 50a is H.

FIG. 17C shows the first intermediate adapter 50.
It is the figure which looked at from the back. The body coupling mount 70
Bayonet mount claw 70a and mount opening 70c
And are alternately arranged. Body coupling mount 70
A fixing protrusion 50b is provided between the inner diameter side and the optical system 51 so as to interfere with the flange portion 141a (see FIG. 16) of the second camera body 40 when the mount is mounted. The body coupling mount 70 is provided with a flat portion 50c between the inner diameter side and the optical system 51 at a position one step lower than the fixing protrusion 50b.

(Second Intermediate Adapter) FIG. 18 is a sectional view showing a second intermediate adapter 80 according to the present embodiment. The second intermediate adapter 80 is an adapter that can be attached only to an interchangeable lens having a certain back focus or more. In this embodiment, the second intermediate adapter 80 has an optical system 81 in a lens barrel and expands the focal length of the lens. -Used as a converter. The intermediate adapter 80 is provided with a body connection mount 70 for mounting on a camera body on the body side of the main body, and a lens connection mount 60 for mounting on an interchangeable lens is provided on the opposite side. In the intermediate adapter 80, the back focus M
Is long (about 38 mm or more in back focus) so that an interchangeable lens having a certain or more back focus can be mounted. Here, the metal back is the same A as the intermediate adapter 50 described above. Further, a distance L between the rear end portion 80b of the lens and the mount reference plane 103 is set.

FIG. 18A is a view of the second adapter 80 as viewed from the front. In the lens coupling mount 60, bayonet mount claws 60a and mount openings 60b are alternately arranged. The rear portion of the mount 60 has a flange portion 80a, and the dimension from the mount reference surface 104 to the flange portion 80a is denoted by K.

FIG. 18C is a view of the second adapter 80 as viewed from the rear. The body coupling mount 70 has bayonet mount claws 70a and mount openings 70c alternately arranged.

The above dimensional relationships can be summarized as follows: E>G>D> F and B + F> A and C + G>
A and E>I>D> L and M + L> A and J + I>
The camera system is configured so that A and H>G>K> F.

(Mountability) Next, mounting of the first or second camera body, the first or second interchangeable lens, and the first or second intermediate adapter of the camera system according to the present embodiment. Will be described.

FIG. 1 is a sectional view showing a case where the first camera body, the first intermediate adapter, and the first interchangeable lens according to the present embodiment are connected. The first body 30
All the interchangeable lenses and the intermediate adapter can be mounted, and the intermediate adapter 50 can be mounted with all the interchangeable lenses. Therefore, the first intermediate adapter 50 is
Between the first interchangeable lens 10 and the first camera body 30.

When the first interchangeable lens 10, the first intermediate adapter 50, and the first camera body 30 are mounted, the light beam passes through the photographing lenses 1 and 2 and the optical system 51 and is partially transmitted. Is reflected by the quick return mirror 31 having a semi-transmissive portion and enters the finder optical system,
The light reaches the photographer's eye via the reticle 32, the condenser lens 33, the pentaprism 34, and the eyepiece 35.
On the other hand, the remaining light flux passes through the semi-transmission part of the mirror 31,
The light enters the light receiving element 38 from the reflecting mirror 36 via the lens 37, and the output of the light receiving element 38 causes the focus detection circuit 39
To determine the focus. These are known techniques and will not be described further.

FIG. 2 is a sectional view showing a case where the first camera body, the first intermediate adapter, and the second interchangeable lens according to the present embodiment are connected. The first body 30
All the interchangeable lenses and the intermediate adapter can be mounted, and the intermediate adapter 50 can be mounted with all the interchangeable lenses. Therefore, the first intermediate adapter 50
Can be mounted between the second interchangeable lens 20 and the first camera body 30.

FIG. 3 is a cross-sectional view showing a case where the first camera body, the second intermediate adapter, and the first interchangeable lens according to the present embodiment are connected. First camera body 3
0 indicates that all the interchangeable lenses and the intermediate adapter can be mounted, and the second intermediate adapter 80 can be mounted only on the interchangeable lens having a certain or more back focus. The first interchangeable lens 10 is an interchangeable lens having a short back focus. In this case, the projection 10a provided on the inner diameter portion of the mount of the first interchangeable lens 10 and the front flange portion 80a of the intermediate adapter 80 interfere with each other, and the first interchangeable lens 10 and the second intermediate adapter 80 Wear is prevented. Therefore, the second intermediate adapter 80
Cannot mount the first interchangeable lens 10.

FIG. 4 is a cross-sectional view showing a case where the first camera body, the second intermediate adapter, and the second interchangeable lens according to the present embodiment are connected. Second intermediate adapter 8
0 can be attached only to an interchangeable lens having a certain back focus or more, and the second interchangeable lens 20 is a lens having a long back focus. Therefore, the second intermediate adapter 80 can be mounted between the second interchangeable lens 20 and the first camera body 30.

FIG. 5 is a cross-sectional view showing a case where the second camera body, the first intermediate adapter, and the first interchangeable lens according to the present embodiment are connected. First interchangeable lens 10
Is a lens with a short back focus, and the first intermediate adapter 50 is an adapter to which all interchangeable lenses can be attached. Further, the first body 40 can only be mounted with an interchangeable lens having a certain back focus or more and an intermediate adapter that can be mounted on the interchangeable lens. In this case, the fixing projection 50b at the rear end of the first intermediate adapter 50
And flange portion 141a at the rear of body mount 140
Therefore, the first intermediate adapter 50 cannot be mounted on the mount of the second camera body 40.

FIG. 6 is a sectional view showing a case where the second camera body, the first intermediate adapter, and the second interchangeable lens according to the present embodiment are connected. Second camera body 4
Reference numeral 0 denotes an interchangeable lens having a certain or more back focus and a body to which only an intermediate adapter capable of attaching the interchangeable lens can be attached. The intermediate adapter 50 is an adapter to which all interchangeable lenses can be attached. On the other hand, the second interchangeable lens 20 is a lens having a long back focus. Therefore, the first intermediate adapter 50 cannot be mounted on the second camera body 40 as in the case of FIG.

FIG. 7 is a cross-sectional view showing a case where the second camera body, the second intermediate adapter, and the first interchangeable lens according to the present embodiment are connected. The intermediate adapter 80
It is an adapter that can be attached only to an interchangeable lens having a certain back focus or more. The interchangeable lens 10 is a lens having a short back focus. Further, the second camera body 40 is a body that can only be attached with an interchangeable lens having a certain back focus or more and an intermediate adapter capable of attaching the interchangeable lens. In this case, the fixing projection 1 provided on the inner diameter of the mount of the first interchangeable lens 10
0a and the front flange portion 8 of the second intermediate adapter 80
0a interferes to prevent the mounting of the first interchangeable lens 10 and the second intermediate adapter 80. Therefore, the second intermediate adapter 80 can be attached to the second camera body 40, but cannot attach the first interchangeable lens 10.

FIG. 8 is a cross-sectional view showing a case where the second camera body, the second intermediate adapter, and the second interchangeable lens according to the present embodiment are connected. Second interchangeable lens 20
Is a lens having a long back focus, and the second intermediate adapter 80 is an adapter that can be attached only to an interchangeable lens having a certain or more back focus. Therefore, the second intermediate adapter 80 is connected to the second interchangeable lens 20.
And the second camera body 40.

FIG. 9 is a cross-sectional view showing a case where the first camera body and the first interchangeable lens according to the present embodiment are connected. Although the first interchangeable lens 10 has a short back focus B, the first camera body 30 can be mounted on all the interchangeable lenses.
It can be mounted on the first camera body 30.

FIG. 10 is a cross-sectional view showing a case where the first camera body and the second interchangeable lens according to the present embodiment are connected. Since the second interchangeable lens 20 has a long back focus and the second body 30 can be attached to all the interchangeable lenses, the second interchangeable lens 20 can be attached to the first camera body 30. it can.

FIG. 11 is a cross-sectional view showing a case where the second camera body and the first interchangeable lens according to the present embodiment are connected. The first interchangeable lens 10 has a short back focus, and the second body 40 can only be mounted with an interchangeable lens having a certain back focus or more. Fixed projection 1
0a and the flange portion 141a behind the body mount 140 of the second body 40 interfere with each other. Therefore, the combination of the first interchangeable lens 10 and the second camera body 40 cannot be mounted even if their mount shapes are the same.

FIG. 12 is a cross-sectional view showing a case where the second camera body and the second interchangeable lens according to the present embodiment are connected. The second interchangeable lens 20 has a long back focus, and the second body 40 can only be mounted with an interchangeable lens having a certain or more back focus. 40.

Therefore, in the combination shown in FIGS. 3, 5, 6, 7, and 11, mounting cannot be performed even if the mounting shapes are the same.

(Another Embodiment of First Interchangeable Lens) FIG. 1
FIG. 9A is a view of another embodiment of the interchangeable lens 10 as viewed from behind the lens-side mount 3. FIG. 19 (b)
FIG. 10 is a side view showing a part of another embodiment of the interchangeable lens 10. In the following description, the same members as those in the first embodiment will be denoted by the same reference numerals, and detailed description of those portions will be omitted.

The interchangeable lens 10 is connected to an electric contact on the camera body 30 side or the first intermediate adapter 50 side, and supplies an electric contact 50a for supplying power and communicating information.
Is provided. As shown in FIG.
a is provided so as to surround the electrical contact 50a around the optical axis O of the interchangeable lens 10. Specifically, the fixing protrusion 10
a is a counterclockwise direction from the upper part of the aperture lever 60.
In the range up to d (in FIG. 19A, a range of about ± 40 ° across the optical system 2 with the optical axis O as a center), the aperture lever 60 and the detachable groove 3d are not interfered. Is provided. Thus, when the first interchangeable lens 10 is mounted on the first camera body 30 or the first intermediate adapter 50, the electric contacts 50a can be protected by the fixing protrusions 10a. Also, when the first interchangeable lens 10 is carried or stored, it is possible to prevent another member from contacting the electrical contact 50a and being damaged.

The fixed projection 10a can be provided with inclined surfaces 10c and 10d at both ends around the optical axis O. Thus, when the first interchangeable lens 10 is mounted on the first camera body 30, the slopes 10c and 10d
The contact between the zero and the components inside the first camera body 30 is reduced, and these members are prevented from being damaged. Also, the first
When trying to mount the interchangeable lens 10 of the first embodiment eccentrically on the body-side mounts 130 and 140, the first interchangeable lens 1
0 lens-side mount 3 is turned in the opposite direction to that in normal mounting, the first interchangeable lens 10 is moved to the first camera body 3.
0, second camera body 40 or first intermediate adapter 5
Even when the user tries to mount the lens at a position different from the normal position at 0, it is possible to prevent the aperture lever 60 and the components inside the first camera body 30 from being damaged.

(Another Embodiment of First Intermediate Adapter) FIG. 20A is a view of another embodiment of the first intermediate adapter 50 as viewed from the rear of the body connection mount 70. FIG. 20B is a side view showing a part of a first intermediate adapter 50 according to another embodiment. First intermediate adapter 5
0 is provided with an electric contact 150 connected to the electric contact on the camera body 30 side for supplying power, communicating information, and the like, and is provided around the optical axis O so as to surround the electric contact 150. A fixing projection 50b is provided. Specifically, the fixed protrusion 50b extends from the upper portion of the aperture lever 160 to the upper portion of the mounting / removing groove 70d in a counterclockwise direction (FIG. 20A).
At about ± with the optical axis O as the center and
The aperture lever 160 and the detachable groove 70d
It is provided so as not to interfere with. Thereby, the first
When the intermediate adapter 50 is mounted on the first camera body 30, the electric contact 150 can be protected by the fixing projection 50b. Also, when the first intermediate adapter 50 is carried or stored, it is possible to prevent other members from contacting the electrical contact 150 and being damaged.

The fixed projection 50b is provided with slopes 50d and 50e at both ends around the optical axis O. Thus, when the first intermediate adapter 50 is mounted on the first camera body 30, the slopes 50d and 50e are
And alleviate the contact with the components inside the first camera body 30 to prevent these members from being damaged. When the body connection mount 70 of the first intermediate adapter 50 is turned in the opposite direction to that during normal mounting, the first intermediate adapter 50 is moved to the first camera body 30 or the second camera body 40 at a position different from the normal position. Even when the user tries to mount the camera, it is possible to prevent the diaphragm lever 160 and the components inside the first camera body 30 from being damaged.

Various modifications and changes are possible without being limited to the above-described embodiment, and these are also within the equivalent scope of the present invention. For example, the camera system of the present embodiment may include another interchangeable lens group having a different back focus. Although the intermediate adapter of the present embodiment is applied to a tele converter, it can be implemented in a combination of another intermediate adapter such as an intermediate ring or bellows for close-up photography, a camera body, and an interchangeable lens.

[0057]

As described above, according to the present invention, the first
The camera body has a clearance inside the body side mount over the mounting range of the interchangeable lens or the intermediate adapter so that all the interchangeable lenses and all the intermediate adapters can be mounted, and the second camera body is fixed. An interchangeable lens having the above back focus or an intermediate adapter that can be attached only to this interchangeable lens is provided with an internal flange portion of the body side mount, and an interchangeable lens shorter than a certain back focus or a specific When the intermediate adapter is to be mounted on the second camera body, the intermediate adapter is provided with a fixing member that interferes with the flange portion inside the body-side mount at the time of mounting and prevents engagement of the mount. Can use a wide range of interchangeable lenses and intermediate adapters, which offers Heard.

On the other hand, by providing a back focus lens and an intermediate adapter that cannot be mounted on a conventional camera, the maker can restrict the camera body, but has an interchangeable lens with a short back focus or a specific intermediate lens. By preparing a camera that supports the adapter, it becomes possible to develop interchangeable lenses and intermediate adapters that were previously considered impossible in the specifications.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a case where a first camera body, a first intermediate adapter, and a first interchangeable lens according to the present embodiment are connected.

FIG. 2 is a cross-sectional view showing a case where a first camera body, a first intermediate adapter, and a second interchangeable lens according to the present embodiment are connected.

FIG. 3 is a cross-sectional view showing a case where a first camera body, a second intermediate adapter, and a first interchangeable lens according to the embodiment are connected.

FIG. 4 is a cross-sectional view showing a case where the first camera body, the second intermediate adapter, and the second interchangeable lens according to the embodiment are connected.

FIG. 5 is a cross-sectional view showing a case where the second camera body, the first intermediate adapter, and the first interchangeable lens according to the embodiment are connected.

FIG. 6 is a cross-sectional view showing a case where the second camera body, the first intermediate adapter, and the second interchangeable lens according to the present embodiment are connected.

FIG. 7 is a cross-sectional view showing a case where a second camera body, a second intermediate adapter, and a first interchangeable lens according to the present embodiment are connected.

FIG. 8 is a cross-sectional view showing a case where a second camera body, a second intermediate adapter, and a second interchangeable lens according to the present embodiment are connected.

FIG. 9 is a cross-sectional view showing a case where the first camera body and the first interchangeable lens according to the present embodiment are connected.

FIG. 10 shows a first camera body and a second camera body according to the embodiment.
FIG. 4 is a cross-sectional view showing a case in which the above-mentioned interchangeable lens is combined.

FIG. 11 illustrates a second camera body and a first camera body according to the embodiment.
FIG. 4 is a cross-sectional view showing a case in which the above-mentioned interchangeable lens is combined.

FIG. 12 illustrates a second camera body and a second camera body according to the present embodiment.
FIG. 4 is a cross-sectional view showing a case in which the above-mentioned interchangeable lens is combined.

FIG. 13 is a cross-sectional view showing a first interchangeable lens of the present embodiment.

FIG. 14 is a cross-sectional view illustrating a second interchangeable lens of the present embodiment.

FIG. 15 is a cross-sectional view illustrating a first camera body of the present embodiment.

FIG. 16 is a cross-sectional view illustrating a second camera body of the present embodiment.

FIG. 17 is a cross-sectional view illustrating a first intermediate adapter according to the present embodiment.

FIG. 18 is a cross-sectional view illustrating a second intermediate adapter according to the present embodiment.

FIG. 19 is a cross-sectional view and a side view showing another embodiment of the first interchangeable lens.

FIG. 20 is a sectional view and a side view showing another embodiment of the first intermediate adapter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 1st interchangeable lens 20 2nd interchangeable lens 10a Fixing protrusion 10c, 10d Slope 50a Electrical contact 30 First camera body 40 Second camera body 50 First intermediate adapter 80 Second intermediate adapter 150 Electrical contact 50b Fixing projections 50d, 50e Slope 60 Lens connection mount 70 Body connection mount 141a, 131a Flange surface 3 Lens side mount 130 Camera side mount

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-43909 (JP, A) JP-A-53-66220 (JP, A) JP-A-5-25435 (JP, U) 11850 (JP, B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) G03B 17/14

Claims (4)

(57) [Claims] 1. A first and a second camera body in which a metal back from a mount reference surface to a film surface has the same dimensions and a body-side mount having the same shape, and a common lens engaged with the body-side mount. A camera system comprising: a plurality of interchangeable lenses having side mounts; and a plurality of intermediate adapters connected between the camera body and the interchangeable lens, wherein the first camera body has any intermediate adapter attached. In order to make it possible, inside the body side mount,
Has a relief portion for mounting a range between adapters in them, said second camera body, so as to enable attachment between the adapter in that having a certain level of back focus, the body-side mounting inside the flange part have a intermediate adapter having the following back focus constant dimensions
Means to attach to the second camera body
In addition, when the mount is mounted,
The fixing projection that interferes with the
The fixing protrusion is provided on the inner diameter side of the body connection mount of the intermediate adapter, and the fixing protrusion is provided on the body side mount.
Hold the intermediate adapter-side electrical contacts that connect to the
A camera system, which is a protection member for protecting the camera. 2. The camera system according to claim 1 , wherein the protection member is provided with a buffer for buffering contact with a component on the camera body when the protection member is mounted on the camera body. A camera system, characterized in that: 3. A intermediate adapter for use in a camera system including a second camera body having a flange portion of the inner body side mount so as to be mounted only interchangeable lens having a predetermined or greater back focus, fixed size Intermediate adapter with the following back focus
When mounting on the second camera body, when the mount is mounted, the fixing projection which interferes with the flange portion inside the body-side mount and hinders the mount coupling is provided.
Install between the body coupling mount of the intermediate adapter and the optical system.
The fixing protrusion is provided on a body provided on the body-side mount.
Hold the intermediate adapter-side electrical contacts that connect to the
An intermediate adapter, which is a protective member for protecting . 4. The intermediate adapter according to claim 3 , wherein the protective member includes a component on the first or second camera body side when attached to the first or second camera body. An intermediate adapter provided with a buffer unit for buffering contact with the intermediate adapter.