JPS6220835Y2 - - Google Patents

Description

[Detailed explanation of the invention] The invention is a mounting device, more specifically,
The present invention relates to a mount device in which a mount part provided with a coupling for transmitting driving force from a camera body to an interchangeable lens is provided with a connector capable of transmitting electrical information between the camera body and the interchangeable lens.

In addition to the various information transmission functions of a single-lens reflex camera, the lens mount of a single-lens reflex camera with an autofocus function transmits the output from the drive circuit inside the camera body to the lens extension mechanism of the interchangeable lens to drive focusing. Although a driving force transmission system is provided, in reality, a new information transmission system such as electric signals for limiting the extension range from the lens side or switching modes is required. For this reason, a new connector is required between the camera body and the interchangeable lens, but in the case of a bayonet mount, a special device is required for the connector in order to rotate the lens by the attachment/detachment angle.

The applicant has already proposed an interchangeable lens attaching/detaching device for an autofocus camera that provides a coupling between the camera body and the interchangeable lens and transmits the output from the camera body to the interchangeable lens.
95715).

First, the basic configuration of this device will be explained, and problems encountered when a new information transmission system is added will be discussed.

FIG. 1 is a mechanical diagram showing an example of a lens attaching/detaching device for an autofocus camera, and FIG. 2 is a diagram showing an engaged state of the attaching/detaching lever of the attaching/detaching device and a lens-side bayonet.

The body mount 1 is provided with a body-side coupling 2 parallel to the optical axis. The front end of the body-side coupling 2 is provided with a groove 2a that engages with the lens-side coupling 12, and is composed of a prismatic section 2d that fits into the rotating shaft of the bevel gear 7 and a coupling shaft 2b. The collar 2c is fixed by caulking or the like. The rotation axis of the bevel gear 7 is rotatably provided in the front end recess of the mirror box 3, and
A spring 8 is inserted between the tip of the coupling ring 2 and the tip of the coupling ring 2, and is always biased in the projecting direction. Lens attachment/detachment lever 4
is pivotally supported on a shaft 4a, the key part 4b at the tip engages with the notch part 13a of the bayonet 13 on the lens side (see Fig. 2), and the base part 4c is linked to a lens attachment/detachment button (not shown) and rotates counterclockwise. Rotate in the direction. The interlocking lever 5 has a cam portion 5a that comes into contact with the base 4c of the detachable lever 4, a sliding groove 5b that is guided by two pins 6, 6 carved in the mirror box 3, and a flange 2c of the coupling 2. It is composed of a tongue-shaped portion 5c that is in contact with the tongue portion 5c.

In the interchangeable lens attachment/detachment device configured as above,
When attaching or detaching a lens, when a lens attachment/detachment button (not shown) is pressed, the attachment/detachment lever 4 rotates counterclockwise around the shaft 4a, disengaging from the bayonet on the lens side shown in FIG. 4c contacts the cam portion 5a of the interlocking lever 5, and the interlocking lever 5 is guided by the pins 6, 6 and slides rearward. When the interlocking lever 5 slides rearward, the body-side coupling 2 retreats to the rear of the mount surface against the biasing force of the spring 8 due to the collar 2c in contact with the tongue-shaped portion 5c, thereby preventing the connection with the lens-side coupling 12. The lens can be removed by rotating the interchangeable lens by the attachment/detachment angle. According to this device, it is possible to quickly and reliably engage and disengage the coupling ring provided on the mount surface for extending the lens when attaching and detaching the lens.

However, in order to further provide a large number of connectors for information transmission on the mounting surface, each terminal of the connector must be prevented from coming into contact with other terminals or the coupling for driving the lens described above. Otherwise, the connector may hit the mating coupling or connector, making it uncomfortable to wear the lens, or they may scratch each other or get caught, making it impossible to wear the lens.

The purpose of this invention is to operate the attachment/detachment of the interchangeable lens when the mount section, which is equipped with a coupling that transmits driving force from the camera body to the interchangeable lens, is provided with a connector for transmitting information between the two. The object of the present invention is to provide a mounting device that allows easy and reliable mounting.

In order to achieve the above object, the mounting device according to the present invention engages a fixed side coupling fixed in the optical axis direction and a movable side coupling constantly biased in the optical axis direction when the camera body and the interchangeable lens are coupled. A mount device that transmits and receives rotation between the camera body and the lens, and transmits electrical signals between the camera body and the interchangeable lens using one or more connectors provided on the mount surface,
A first group of connectors on a mount surface facing the fixed coupling, which is a connector within a rotational range of each of the couplings from a mounting start position to a mounting end position of the interchangeable lens, contacts the fixed coupling. Provided on the first reference plane,
A second group of connectors on the mount surface facing the movable coupler is provided on a second reference surface that is flush with or concave to the flange surface of the mount, and a group of connectors that are coupled to the first group of connectors are The connector group is configured to be more convex than the first reference surface, and the connector group coupled to the second connector group is configured to be more convex than the second reference surface.

According to the above structure, the object of the present invention can be completely achieved.

Hereinafter, the present invention will be explained in more detail with reference to the drawings and the like.

FIG. 3 is a front view of a mount on the camera body side showing an embodiment of the mount device according to the present invention, and FIG. 4 is a plan view showing the positional relationship between couplings and connectors on the camera body side and lens side.

In FIG. 3, the mounting start position with the mounts aligned is shown, and the lens side mount at this position is shown by a broken line. Connectors CB ₁ to CB ₅ are connectors on the body side, connectors CL ₁ to _{CL 5} are connectors on the lens side, and when a lens is attached, connectors CB ₁ to _{CB 5} on the body side are connectors on the lens side.
It is arranged at the position where it binds to CL ₁ to CL ₅ . The bayonet mount can be adjusted by an angle θ from this position.
When the lens is rotated clockwise in the figure, it is locked by the lens locking mechanism and the locking pawl 4b provided on the body side, completing the installation of the lens. As a result, the body-side connectors CB ₁ to CB ₅ and the lens-side connectors CL ₁ to _{CL 5} are in corresponding positions, completing engagement for electrical connection. At the same time, the body-side coupling BC and the lens-side coupling LC reach their corresponding positions, completing engagement for driving the lens.

When the bayonet claws on the body side and the lens side are simply fitted together, that is, the maximum movement range of the outer diameter of the body side coupling BC and the lens side coupling LC at the starting position is within the area Z shown by the imaginary line. be. The minimum value of region Z is given by Zmin=θ+αB+αL or Zmin=θ+αB+αL+β+γ. Here, θ is the lens attachment/detachment angle at which the lens must be rotated from the lens attachment start position to the attachment end position. αB is 1/2 of the angle between the outer diameter of the body-side coupling BC and the point O on the optical axis. αL is an angle given by 1/2 of the angle between the outer diameter of the lens-side coupling LC and the point O on the optical axis. The angle β is the design play in the opposite direction when the lens is fitted to the body, and is the angle given by the stopper on the body side and the bayonet on the lens side. The angle γ is the margin angle between the lens and the body after the lens is set to the stopper, and is an angle for ensuring reliable locking. Each terminal, such as connectors CB ₃ to _{CB 5} on the body side or connectors CL ₁ and CL ₂ on the lens side, which are partially or completely within the area Z, is connected to the light of the coupling LC on the lens side fixed in the thrust direction. It must be flush or concave with respect to the axial plane.

Next, the detailed structure will be further explained with reference to FIG. The body side mount 21 is provided with a body side coupling BC parallel to the optical axis.
It is pivotally supported by a metal bearing 25 inserted between mount bases 23. Body side cup spring
BC is always biased in the protruding direction by a spring inserted between it and the metal bearing 25. A gear 26 is provided on the rear side of the body-side coupling BC, and the gear 26 meshes with a gear 28 provided on a gear shaft 27 implanted in a base plate 24 screwed to the mount base 23. . Forward and reverse rotation from a motor controlled by a drive circuit within the camera body is transmitted to the gear 28 via a gear train (not shown). The lever 29 is attached to the lens lock claw 4b (third
This is a lever that moves together with the body-side coupling lever, which moves gear 26 in the thrust direction.
This is for retracting the tip of BC from the flange surface FB of the mount 21. On the lens side mount 31, a lens side coupling LC which can be engaged with the body side coupling BC is pivotally supported by a metal bearing 35, and a gear 36 provided at the rear end.
is connected to a lens extending mechanism (not shown).

Connectors CB ₁ to _{CB 5} are provided on the body side mount 21 with insulating members 22 interposed therebetween. Connectors CB ₁ and CB ₂ are connectors located outside the above-mentioned area Z, and are always biased so that they can protrude beyond the flange surface FB.The front end has a hemispherical shape, and the rear end is engaged with a ring. It has been stopped. Connector CB ₃ ~ _{CB 5}
is a connector located within region Z, has a flat tip, and is fixedly locked to the insulating member 22 with a ring. The tips of the connectors CB ₃ to _{CB 5} are provided flush with or concave to the flange surface FB. These connectors CB ₁ to _{CB 5} are mounted on mount 21
The space formed by the mount base 23 and the mount base 23 is connected to a control circuit on the body side by wiring (not shown).

Connectors CB ₁ to _{CB 5} are provided on the lens side mount 31 via an insulating member 32 . The connectors CL ₃ to _{CL 5} are connectors located outside the area Z, and have hemispherical tips and flat rear ends, and the flat surface of the rear ends is connected to the receiving member 3 provided on the main plate 34.
The spring inserted between 9 always keeps the flange surface
It is biased to be able to protrude more than FL. connector
This is to ensure that the terminals CL ₃ to _{CL 5} can be sufficiently electrically connected to the terminals on the body side. Connector CL ₁ ,
CL ₂ is a connector within area Z,
The front end and the rear end are flat, and a spring is inserted between the receiving member 39 provided on the base plate 34 on the flat surface of the rear end. The connectors CL ₁ and CL ₂ are also movable, although the amount of movement is smaller than that of the connectors CL ₃ to _{CL 5} , but they can also be fixed depending on the corresponding connectors. Connector CL ₁ ,
The tip of CL ₂ is provided flush with or concave to the flange surface FL. These connectors CL ₁ to _{CL 5} are electrically connected by springs, and are connected to a detection unit on the lens side by wiring (not shown).

In addition, both the body and lens connectors CL ₁ ~
Both CL ₅ and CB ₁ to _{CB 5} are insulating members and do not leak from other members, but this does not apply when both connectors are used as ground contacts.

Next, the mounting operation of the above-mentioned mounting device will be explained.

When the lens is brought into contact with the barrel surface, the lens connectors CL ₃ to CL ₅ are pushed in the thrust direction against the springs provided on each connector until they come into contact with the flange surface FB of the body. Similarly, the body coupling BC and the body connectors CB ₁ and CB ₂ are pushed in the flange direction up to the lens flange surface FL. When the lens is rotated by the mounting angle θ to mount the lens, the connectors CL ₃ to CL ₅ , CB ₁ , CB ₂ and the coupling BC advance while contacting the flange surface of the mating side. None of the other connectors CL ₁ , CL ₂ , CB ₃ to _{CB 5} advances without hitting the flange surface of the mating side. When the lens is rotated by an angle θ, the lens is attached, and each connector and coupling are brought to a corresponding position, and the corresponding connectors on the lens side and the body side are electrically connected, and both couplings are engaged.

FIG. 5 is a sectional view showing another embodiment of the present invention. In addition, in order to make it easier to understand, the lens is shown in a flat view, with the body and lens facing each other.

CL ₁ to _{CL 4} are connectors on the lens side, FL is a flange on the lens side, LC is a coupling on the lens side, CB ₁ to _{CB 4} are connectors on the body side, FB is a flange on the body side, and BC is a coupling on the body side. be. Lens side connector CL ₄ shown in dashed line
shows the position when coupling rings LC and BC are engaged. In other words, the flange surfaces do not contact each other only in the region corresponding to region Z in FIG. 3, and the barreled surface for attaching the lens, in other words, the reference surface of the flange back, is provided separately.

In this embodiment, the flange FB on the body side and the flange FL on the lens side are not in contact with each other, so the shape of the connector tip can be made relatively flat, and there is no need to worry about damaging each other's flange surfaces. It's gone.

As explained in detail above, according to the present invention, when the mount section, which is provided with the coupling that transmits the driving force from the camera body to the interchangeable lens, is provided with a connector for providing the function of transmitting information between the two, This has the effect that the operation of attaching and detaching the interchangeable lens can be done easily and reliably.

Although this embodiment has been described with reference to the relationship between the coupling and the connector of an autofocus camera with interchangeable lenses, the present invention can be similarly applied to a system in which the aperture blades are driven as a coupling.

[Brief explanation of the drawing]

FIG. 1 is a mechanical diagram showing an example of a lens attaching/detaching device for an autofocus camera, and FIG. 2 is a diagram showing an engaged state of the attaching/detaching lever of the attaching/detaching device and a lens-side bayonet. Fig. 3 is a front view of the mount on the camera body side showing an embodiment of the mount device according to the present invention, Fig. 4 is a plan view showing the positional relationship between the coupling connectors on the camera body side and the lens side, and Fig. 5 The figure is a sectional view showing another embodiment of the present invention. CL ₁ ~ CL ₄ ... Lens side connector, CB ₁ ~ _{CB 4}
... Lens side connector, FL ... Lens side flange, FB ... Body side flange, LC ... Lens side coupling, BC ... Body side coupling, 21, 31 ... Mount, 22, 32 ...
Insulating member, 23, 33...Mount base, 24
...Main plate, 26, 28, 36...gears.

Claims (1)

[Claims for Utility Model Registration] (1) When a camera body and an interchangeable lens are coupled, a fixed side coupling fixed in the direction of the optical axis and a movable side coupling which is constantly biased in the direction of the optical axis are engaged, and the camera body and the lens, and transmits electrical signals between the camera body and the interchangeable lens using one or more connectors provided on the mount surface. A first group of connectors on a mount surface facing the fixed coupling, which are within the rotational range of each of the couplings up to the fixed coupling, is provided on a first reference surface that does not contact the fixed coupling, and A second group of connectors on the mount surface facing the movable coupling ring is provided on a second reference surface that is flush with or concave to the flange surface of this mount, and a group of connectors to be coupled to the first group of connectors is provided on a second reference surface that is flush with or concave to the flange surface of this mount. A mount device characterized in that the first reference surface is convex than the first reference surface, and a connector group to be coupled to the second connector group is convex than the second reference surface. (2) The mounting device according to claim 1, wherein the first reference surface is the same as or concave to the flange surface of the mount facing the stationary coupling. (3) The mounting device according to claim 1, wherein the drive unit for the interchangeable lens is a lens focusing drive unit or an aperture blade drive unit.