JPS609781Y2 - Electrical connection device for interchangeable lens cameras - Google Patents

Description

[Detailed description of the invention] This invention relates to an electrical connection device for transmitting various electrical information from the lens barrel side to the camera body side, or from the camera body side to the lens barrel side, and is particularly applicable to the camera body. The present invention relates to an electrical connection device for an interchangeable lens camera equipped with a mount lock mechanism that locks an attached interchangeable lens to a camera body.

Conventionally, the electrical connection device described above has been provided with corresponding electrical joints on the surfaces of the mounts of the interchangeable lens and the camera body, and when the interchangeable lens is attached to the camera body, the corresponding joints come into contact with each other. This is what is generally known.

However, if the electrical connection part is exposed on the surface of the mount part, there are disadvantages such as damage or dirt. Recently, it has been proposed that the electrical connection part on the camera side, which is normally recessed into the mount part of the camera body, is protruded by the operating member and connected to the electrical connection part on the interchangeable lens side. This electrical connection device not only requires a special operation member on the camera body side, but also an interlocking member such as a bottle on the interchangeable lens side that operates the operation member in conjunction with attachment to the camera body. is necessary, and the installation of the operating parts complicates the configuration inside the camera body.
Not only does the number of parts increase, which increases production costs, but also,
When used in conventional camera bodies and interchangeable lenses,
Another drawback is that both the camera body and the interchangeable lens must be modified.

In addition, since interlocking members such as pins of interchangeable lenses are inevitably protruding, there is a risk that they may be damaged or deformed by contact with foreign objects, and if they are damaged or deformed, it will be difficult to establish the intended electrical connection. .

This invention provides an electrical connection device for an interchangeable lens camera in which at least one of the electrical connection parts on the interchangeable lens side and the camera side is provided deeper than the end surface of the mount member, and includes an electric connection operation member and an actuation member that operates it. An object of the present invention is to provide an electrical connection device for an interchangeable lens camera, which allows the connection between an electrical connection section on the interchangeable lens side and an electrical connection section on the camera body side to be permanently connected without special provision. The mount lock mechanism that locks the interchangeable lens attached to the camera body also serves as a direct operation means for joining the two electrical joints together, and when the lock is activated, the mount lock mechanism locks the interchangeable lens attached to the camera body. The holder is characterized in that the holding member of the electrical joint provided further back than the end face of the mount member is pushed so that the electrical joints on the camera side and the interchangeable lens side are joined to each other.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

First, FIGS. 1 to 3 show a first embodiment in which this invention is applied to an interchangeable lens camera in which a mount lock mechanism is provided within the camera body.

FIG. 1 shows the mount part of the lens barrel of an interchangeable lens.
lc is formed.

Further, one end of a joint holding member 2 made of an insulating elastic plate is fixed to the inner peripheral edge of the mount 1 with a screw 3, and a protrusion 2 formed at the free end of this holding member
a is inserted into a notch A formed in one of the projections 1a of the mount 1.

Several electrical joints 4 are provided on the inner periphery of the holding member 2 in the circumferential direction, and each electrical joint is given, for example, information on the set aperture value of the interchangeable lens, focusing information, etc. It is connected to an electrical element such as a resistor (not shown).

On the other hand, Figure 2 shows the mount part of the camera body.
The outer peripheral edge of the mount 5 is formed with protrusions 5a, 5b, and 5c that engage with the protrusions 1a, lb, and lc of the mount 1 when the interchangeable lens shown in FIG. 1 is attached.

Further, one end of a joint holding member 6 made of an insulating rigid plate is fixed to the inner circumferential edge of the mount 5 with a screw 7, and on the outer periphery of this holding member, there is provided an interchangeable lens side in the circumferential direction. The same number of electrical junctions 8 as the electrical junctions 4 are provided.

Here, when the interchangeable lens shown in FIG. 1 is attached to the camera body shown in FIG. 4, and the electrical connection part 8
is connected to, for example, a photometry circuit (not shown) inside the camera body or a connection terminal of an automatic light control light emitting device of the camera body.

To attach the interchangeable lens shown in Fig. 1 to the camera body shown in Fig. 2, attach the mount 1, mount 5, protrusion 1a,
1 bt 1 c and 5at 5bt 5c are stacked so as to be shifted from each other, and then the interchangeable lens is rotated to form the projections 1at 1b.
tlc, 5a, 5b, and 5c form a so-called bayonet.

Further, reference numeral 9 denotes a locking member for locking an interchangeable lens attached to the camera body, which is biased counterclockwise around a shaft 11 by a spring 10, and normally comes into contact with a portion 12 of the camera body.

When the interchangeable lens shown in FIG. 1 is attached to the camera body shown in FIG. Climb over and engage the notch A to lock the interchangeable lens to the camera body.

With the above configuration, when the interchangeable lens shown in FIG. 1 is attached to the camera body shown in FIG. 2 and the lock member 9 engages in the notch A, the free end of the holding member 2 is pressed against the lock member 9. and deflects radially inward.

As a result, as shown in FIG. 3, each electrical junction 4 is joined to the corresponding electrical junction 8, and the electrical connection between the electrical elements within the interchangeable lens and the circuit of the camera body is established.

As described above, in the first embodiment shown in FIGS. 1 to 3, the locking member 9 constituting the mount locking mechanism functions as an operating means for joining the electrical joints 4 and 8 to each other, and There is no need to provide a special electrical connection operation member inside.

Furthermore, since the notch A of the mount 1 is for cooperating with the locking member 9 to lock the interchangeable lens to the camera body, it has traditionally been provided in interchangeable lenses used in cameras having the locking member 9. ing.

Therefore, there is no need to provide a special member on the interchangeable lens side to operate the locking member 9 as an electrical connection operating member.

Further, the holding members 2 and 6 provided with the electrical joints 4 and 8 are fixed to the inner peripheral edges of the mounts 1 and 5, respectively, and the electrical joints 4 and 8 are located deeper than the end surfaces of the mounts 1 and 5. Therefore, there is less risk of direct hand contact with it, and it is possible to prevent inconveniences such as it becoming dirty or being damaged.

Further, the electrical joints 4 and 8 are joined to each other from a direction perpendicular to the joint surface by bending the elastic plate 2 radially inward.

Therefore, not only is there no risk of the parts where both liquids meet and the joint surface deteriorates during joining, but there is also little positional deviation in the joint state of each joint, and each joint can be made smaller, allowing more space to fit into a limited space. A joint portion can be provided.

Next, FIGS. 4 to 6 show a lens exchange system in which a mount lock mechanism is provided inside the camera body as in the above embodiment, but the lock member moves in the axial direction of the lens barrel. A second embodiment in which this idea is applied to a type camera will be shown.

4 and 5 show the mount part on the interchangeable lens side, and the mount 21 on the interchangeable lens side has a notch 21a and an opening 2.
1b is formed, and bent portions 23a and 23b at both ends of a lever-shaped joint holding member 23 rotatably supported around a shaft 22 in a plane horizontal to the axis of the lens barrel are cut out portions 21a, respectively. , 21b.

The holding member 23 holds an electrical joint 24 at a bent portion 23b, is biased to rotate clockwise by a spring 25, and normally comes into contact with a protrusion 21C provided at the back of the opening 21b of the mount 1. , the electrical connection portion 24 is retracted deeper than the end surface of the mount 1.

On the other hand, the mount 26 on the camera body side shown in FIG.
A cutout 26a and an opening 26b corresponding to the cutout 21a1 opening 21b of the mount 21 are provided.

A locking member 27, which is biased toward the left in FIG. 6 by a spring (not shown), protrudes from the notch 26a outside the end surface of the mount 26, and an electrical connection is provided at the back of the opening 26b. A joint holding plate 29 holding a joint 28 is fixed.

In this embodiment as well, in order to attach the interchangeable lens to the camera body, the mount 21 is superimposed on the mount 26 and rotated.

Then, the locking member 27 that comes into contact with the end surface of the mount 21
engages into the notch 2ia of the mount 1, and locks the interchangeable lens to the camera body.

At this time, the openings 21a and 21b overlap each other.

With the above configuration, when the locking member 27 engages with the notch 21a of the mount 1, the holding member 23 is pushed by the bent portion 23a and rotates counterclockwise, as shown in FIG. The bent portion 23b is inserted into the opening 26b of the mount 26.

As a result, the electrical joint 24 held by the bent portion 23b is joined to the corresponding electrical joint 28 held by the holding member 29 on the camera body side, and the electrical elements inside the interchangeable lens and the circuit inside the camera body are connected. electrical connection is achieved.

In this embodiment as well, the locking member 27 on the camera body side functions as an operating means for connecting the electrical joints 4 and 8 to each other, and there is no need to provide a special electrical joint operating member within the camera body.

Also, the notch 21a of the mount 21 is connected to the locking member 27.
This notch 21a has been previously provided in interchangeable lenses used in cameras that have a locking member 27, and also operates the locking member 27 as an electrical connection operating means on the lens side. There is no need to provide a special member for this purpose.

Further, FIGS. 7 to 10 show a third embodiment in which this invention is applied to an interchangeable lens camera in which a mount lock mechanism is provided on the interchangeable lens side.

FIG. 7 shows the mount part on the camera body side, and the inner peripheral edge of the mount 31 on the camera body side has a protrusion 31a,
31b and a notch 31c sandwiched between the protrusions.

Reference numeral 32 denotes a lever-shaped joint holding member provided on the back side of the mount 31, which is biased counterclockwise around a shaft 33 by a spring 34, and normally comes into contact with a stopper (not shown), as shown in FIG. As shown in FIG. 3, the arm portion 32a having the electrical connection portion 35 is retracted to the back side of the projection portion 31a of the mount 31, and the narrow arm portion 32b is exposed to the back side of the notch portion 31c of the mount 1.

On the other hand, FIGS. 8 and 9 show the mount portion on the interchangeable lens side.

The mount 36 on the interchangeable lens side has a bent portion 36a and a radial hole 36b into which a locking member 37 is inserted. An insulating joint holding member 39 holding an electrical joint 38 is fixed thereto.

The locking member 37 is biased radially outward by a spring 40, and when the interchangeable lens is attached to the camera body, the locking member 37 engages with the protrusion 31a of the mount 31 at the bent portion 37a and is once radially inward. When the interchangeable lens is pushed in and rotated to the final mounting position, it engages in the notch 31c of the mount 31 and locks the interchangeable lens to the camera body.

At this time, the arm portion 32a of the holding member 32 faces the insulating plate 39 provided in the recess 36c of the mount 36.

With the above configuration, when the locking member 37 engages the notch 31c of the mount 31, the holding member 32
is pushed by the bent portion 37a of the locking member and rotated counterclockwise, causing the arm portion 32a to enter the recess 36c.

As a result, the electrical joints 35, 38 join together, achieving a connection between the electrical elements within the interchangeable lens and the circuitry within the camera body.

In this embodiment, a locking member 37 is provided on the interchangeable lens side, and since this locking member is also used as an operating means for electrical bonding, a special operating means for electrical bonding is provided on the interchangeable lens side. do not need.

Further, on the camera body side, a notch 31c of the mount 31 cooperates with a locking member 37, but this notch has been previously provided in cameras using interchangeable lenses having a locking member 37, and is not specially designed. There is no need to provide a member for operating the lock member 37.

Although the illustrated embodiment has been described above, this invention is not limited to the above-mentioned embodiment. For example, electrical information within the camera body can be transmitted to the circuit on the interchangeable lens side using the electrical connection according to this invention. You can also set the aperture, focus, or zoom.

In this way, the electrical connection device for an interchangeable lens camera of this invention uses various conventional mount lock mechanisms as direct operation means for joining the electrical joints, and is suitable for use with interchangeable lenses and cameras. The advantage is that existing interchangeable lenses and camera bodies can be used as they are by simply installing a new electrical joint, without requiring a special operating means for the electrical joint or an operating member to operate it. There is.

In addition, the electrical connection device of this invention does not require any protruding interlocking members on either the interchangeable lens side or the camera body side to enable electrical connection operations, so there is no risk of damage or deformation of the members. , it is possible to permanently achieve the desired electrical connection.

Note that the electrical joints on the camera side and the interchangeable lens side are provided deeper than the end faces of the mount members of the camera body and lens barrel, respectively, and at least before the mount lock mechanism is activated, both electrical joints are connected to the camera body and the lens. By preventing the two electrical connections from protruding outside the lens barrel, there is less risk of the two electrical connections coming into direct contact with one's hands, thereby preventing them from getting dirty or damaged.

In addition, if the mount lock mechanism is activated so that one of the electrical joints on the camera side and the lens side is joined to the other from a direction perpendicular to the joining surface, for example, when the two electrical joints are joined by sliding, This eliminates deterioration of both electrical joints due to wear.

Furthermore, since the positional deviation between the two electrical junctions is reduced, the electrical junctions can be made smaller, and therefore many electrical junctions can be provided within a limited space.

[Brief explanation of the drawing]

Figures 1 to 3 show the first embodiment of this invention. Figure 1 is a front view of the mount on the interchangeable lens side, Figure 2 is a front view of the mount on the camera body side, and Figure 3 is a mount lock. FIG. 6 is a diagram illustrating a state in which electrical joints have been joined by a mechanism. Figures 4 to 6 show a second embodiment of this invention;
5 are a cross-sectional view and a front view of the interchangeable lens side mount section, respectively, and FIG. 6 is a cross-sectional view showing a state in which the electrical joint portion has been joined by the mount lock mechanism. 7 to 10 show a third embodiment of this invention, FIG. 7 is a front view showing the mount part on the camera body side, FIG. 8 is a front view showing the mount part on the interchangeable lens side, and FIG. 9 is a front view showing the mount part on the interchangeable lens side. The illustrations are a, b, and c in Figure 8. FIG. 10, which is a cross-sectional view taken at point d, shows a state in which the electrical joints have been joined by the mount lock mechanism. 1.21,36...Interchangeable lens side mount, 5
．． 26, 31... Camera body side mount, 2°8, 23.32.39... Joint holding member, 4
゜8.24, 28, 35, 38... Electrical joint, 9, 27.37... Middle hook member.

Claims (1)

[Scope of Claim for Utility Model Registration] ■ An electrical connection device for an interchangeable lens camera equipped with a mount lock mechanism that locks an interchangeable lens attached to the camera body to the camera body, which corresponds to the interchangeable lens side and the camera side, respectively. and at least one of the electrical joints on the interchangeable lens side and the camera body side is located deeper than the end surface of the mount member in a space into which a part of the mount lock mechanism enters when the lock is activated. Formed on the holding member, the mount lock mechanism is used as a means for directly operating the electrical joint,
An electrical connection device for an interchangeable lens camera, wherein when the lock is activated, the above-mentioned part of the same pushes the above-mentioned holding member, and the corresponding electrical joints on the interchangeable lens side and the camera side are joined to each other. 2. The electrical joints and their holding members on the camera side and interchangeable lens side are provided deeper than the end surfaces of the mount members of the camera body and lens barrel, respectively, and at least before the locking operation of the mount lock mechanism, both electrical An electrical connection device for an interchangeable lens camera according to claim 1, wherein the connection portion does not protrude outside the camera and lens barrel. 3. Claims for registration of a utility model in which, when the mount lock mechanism is locked, a part of the mount lock mechanism pushes the holding member, thereby joining the one electrical joint to the other from a direction perpendicular to the joining surface. An electrical connection device for an interchangeable lens camera according to item 1 or 2. 4. Providing at least the electrical joint on the interchangeable lens side and its holding member deeper than the end surface of the mount member of the lens barrel, and providing the mount lock M on the camera body;
When the mount lock mechanism is locked, a part of the mount lock mechanism pushes the holding member of the electrical joint on the lens barrel side, thereby joining the two electrical joints together. An electrical connection device for an interchangeable lens camera according to item 1. 5. The holding member of the electrical joint on the lens barrel side is made of an insulating elastic plate, and when the mount lock mechanism is locked, a part of the holding member bends this elastic plate and holds both the electrical joints. An electrical connection device for an interchangeable lens camera according to claim 4, wherein the parts are joined to each other. 6. The elastic plate is provided along the inner surface of the mount member of the lens barrel, while the holding member of the electrical joint on the camera body side is positioned inside the elastic plate when the interchangeable lens is attached to the camera body. The electrical connection of the interchangeable lens camera according to claim 5, wherein the mount lock mechanism is provided in the mount lock mechanism, and a part of the mount lock mechanism presses the elastic plate radially inward when the mount lock mechanism is locked. Device. 7 A holding member of the electrical joint on the lens barrel side is rotatably supported in a plane flat in the axial direction, and when the mount lock mechanism is locked, a part of the holding member rotates the holding member. 5. The electrical connection device for an interchangeable lens camera according to claim 4, wherein both the electrical connection portions are connected to each other. 8 At least an electrical joint on the camera side and its holding member are provided deeper than the end face of the mount member of the camera body, and the mount lock mechanism is provided on the lens barrel, so that when the mount lock mechanism is locked, The electric connection device for an interchangeable lens camera according to claim 1, wherein the electric connection device pushes the holding member of the electric connection portion on the lens barrel side and connects both the electric connection portions to each other. . 9 A holding member of the electrical joint on the camera body side is rotatably supported in a plane perpendicular to the axial direction of the lens barrel, and when the mount lock mechanism is locked, a part of it is attached to one end of this holding member. The electric connection device for an interchangeable lens camera according to claim 8, wherein the electric connection portions are connected to each other by pushing the holding member in a radial direction and rotating the holding member. .