JPH07181582A - Adapter device for interchangeable lens - Google Patents

Abstract

PURPOSE:To obtain an adapter device for an interchangeable lens capable of unnecessitating a lens detecting switch and preventing an electric contact from being exposed by attaching a part to which a power is supplied to an adapter device first of all and taking a reverse order at the time of detaching. CONSTITUTION:In a state any parts are not connected with the adapter main body 1, an interchangeable lens locking pin 3 projects from a flange back surface 1e. Thus, when the adapter main body 1 is attached with the camera main body 11, the projecting interchangeable lens locking pin 3 hits against the camera mount 12, then, the adapter is not attached with the camera(A). But, it is not restricted to move the interchangeable lens locking pin 3 in a right direction in the figure, so that the interchangeable lens 13 can be mounted on the adapter main body 1(B). In the case of connecting the interchangeable lens 13 and the camera main body with the adapter, the connection is carried out in the order from the interchangeable lens 3 to the camera main body 11, meanwhile, the operation is carried out only in the reverse order at the time of detaching, then, the power-supplied electric contact is prevented from being exposed, and the lens detecting switch is unnecessitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adapter device which can be mounted between an interchangeable lens and a camera body in a camera system in which the interchangeable lens is removable.

[0002]

2. Description of the Related Art Conventionally, in a single-lens reflex camera system, an adapter mounted between a single-lens reflex camera body and an interchangeable lens is known. This adapter has various purposes, but it is especially for converting the focal length of the taking lens and connecting the interchangeable lens with the camera body with different flange back mount fitting diameter and mount shape. Adapters are well known.

In a single-lens reflex camera system,
In order to determine the mounting position (phase) with the interchangeable lens to be mounted, it has a lock pin supported so as to be able to move forward and backward toward the lens side in the optical axis direction from the mount surface on the camera body side,
The interchangeable lens is configured to be positioned by being fitted into a groove provided in the mount of the interchangeable lens at the lens mounting normal position. This lock pin is configured to move forward and backward from the mount by operating the unlock button installed near the mount of the camera body.When removing the interchangeable lens, operate the unlock button to retract the lock pin and replace it. The fitting with the groove of the mount of the lens is cut off, and the mounting can be released.

In recent years, cameras have become more electronic, and even in single-lens reflex cameras, electric signals are exchanged between the camera body and the interchangeable lens through electric contacts, and power for driving a motor is supplied. .

A problem in the camera body and the interchangeable lens having such electric contacts is a short circuit when the electric contacts are exposed. For example, when the power of the camera body is on, the electrical contacts are exposed to the outside when nothing is connected to the mount. In the worst case, if a metal piece or the like touches between two contact points and is short-circuited, heat or smoke may occur, which is dangerous. As a measure against the above short circuit, a detection switch is installed on the camera mount to detect that the interchangeable lens is attached.When the interchangeable lens is attached to the camera, the detection switch turns on and the contact pin receives the signal and The power supply is configured to be started. The same applies to the above-mentioned adapter, and when this adapter is attached to the camera body, the camera cannot distinguish between the adapter and the interchangeable lens, the detection switch is turned on, and power supply is started. For this reason, the interchangeable lens mounting portion of the adapter has a detection switch so that power can be supplied by detecting attachment of the interchangeable lens to this adapter.

FIGS. 6A and 6B are views showing an example of the above-mentioned adapter. Briefly, 40 is a lens mount which engages with a mount of a camera body (not shown) and a bayonet, 41 is an adapter body, 42 is a lens side mount that engages with an interchangeable lens mount (not shown) and bayonet, 43
Is a contact plate that contacts the electrical contacts of the camera body to exchange electrical signals, 44 is a contact pin that contacts the electrical contacts of the interchangeable lens, 45 is a lens detection plate, and the shaft 45c is centered around the shaft 45c on the adapter body 41. It is rotatably supported by. When the interchangeable lens is coupled to the bayonet, the bayonet claw of the mount of the interchangeable lens and the protrusion of 45a come into contact with each other,
The lens detection plate 45 is set to rotate. 45
Reference numeral b is a protrusion provided integrally with the lens detection plate 45, and is in contact with the switch spring 47. Switch springs 46, 47
The spring retainer 48 has one end fixed to the adapter body 41. Reference numeral 49 is wiring for signal lines in the adapter, and 50 and 51 are wiring for power supply lines.

When the interchangeable lens is not attached, the lens detection plate 45 is urged clockwise by a switch spring 47 about the shaft 45c in the figure. Switch springs 46 and 47
Since it is a non-contact type, the power supply line inside the adapter is broken, the power supplied from the camera side does not flow to the contact pin 44 protruding to the front of the adapter, and there is no problem even if the contact pins are short-circuited. Does not occur.

When the interchangeable lens is mounted, the bayonet claw of the interchangeable lens and the projection 45a come into contact with each other, the lens detection plate 45 is rotated counterclockwise in the figure, and the switch spring 47 is pushed by the projection 46b to switch the switch. The power lines 50 and 51 are brought into contact with each other to come into contact with the spring 46, and power is supplied from the camera body to the interchangeable lens via the adapter. The camera body also has a similar detection switch to prevent short-circuiting of electrical contacts on the camera body alone.

[0009]

However, in the above-mentioned adapter device, a very thin adapter is required for flange back conversion and the like.
The conventional lens detection switch has a complicated mechanism and cannot be incorporated in the adapter. Also, the electrical contact structure needs to be thin, and it is impossible to connect and disconnect the power line in the adapter by using a conventional switch spring.

Further, an operation member for removing the adapter from the camera body and an operation member for removing the interchangeable lens from the adapter are required, and the operation is complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and when an adapter or an interchangeable lens is attached to or detached from a camera body, a lens exchange adapter device which does not require a lens detection switch and whose electric contacts are not exposed is provided. The purpose is to provide.

[0012]

According to the present invention, in an adapter device for an interchangeable lens mounted between a camera body and an interchangeable lens, the camera body and the interchangeable lens are attached to the adapter device. The adapter device is provided with a mounting sequence regulating means for regulating the order of supplying electricity to the adapter device first and regulating the attachment and detachment in the reverse order.

Further, the mounting order regulating means is longer than the distance between the mount surfaces that come into contact with the camera body of the adapter device and the interchangeable lens, and can be moved back and forth to an opening provided in the optical axis direction between the mount surfaces. A lock member to be fitted is provided, and when the camera body or the interchangeable lens is attached to the adapter device, the lock member is moved so that the other can be attached.

Further, the mounting order regulation means regulates mounting of the interchangeable lens on the adapter device, then mounting of the camera body, and mounting / dismounting in the reverse order.

[0015]

Operation: The person who receives electricity from the adapter device should be attached to the adapter device first, and the attachment / detachment order should be set in the reverse order. It is possible to prevent the supplied electrical contacts from being exposed.

Further, a lock member longer than the mount surface of the adapter device is provided as a mounting order regulating means, and when the one mounted on the adapter device first is mounted, the locking member is mounted so that the one mounted later can be mounted. Since it moves, the mounting order regulation is surely observed.

Further, the interchangeable lens is attached to the adapter device, and then the camera body is regulated to be attached, and the attachment / detachment is performed in the reverse order, so that the camera body is provided with a power source and electricity is supplied to the interchangeable lens through the adapter. When supplying, the electric contact can be safely supplied without being exposed.

[0018]

1 to 3 are drawings which best show the features of the present invention, in which FIG. 1 shows an adapter body 1 having a bayonet claw 1a for engaging a bayonet with a mount of a camera body. ing.

Reference numeral 2 denotes a mount for mounting an interchangeable lens, which has a bayonet claw 2a for engaging the interchangeable lens with a bayonet.

Numeral 3 is an interchangeable lens lock pin whose length in the direction of the optical axis is the flange back difference A between the camera body and the interchangeable lens.
Is set longer than the length, and the hole 1 of the adapter body 1
b and the hole 2b of the mount 2 respectively. Further, there is a small diameter portion or a notch portion 3a at substantially the center portion, and the engaging portion 4a of the lens unlock knob 4 is engaged with it. The lens unlock knob 4 projects through the hole 1c of the adapter body 1 to the outer diameter portion and is supported so as to be operable in the optical axis direction. Reference numeral 5 denotes a lens unlock knob 4 spring, which abuts and urges the engaging portion 4a of the lens unlock knob 4 so as to urge the interchangeable lens lock pin 3 toward the interchangeable lens side. Reference numeral 6 is a contact portion for electrically connecting an electric contact of the camera body (not shown) and an electric contact of the interchangeable lens (not shown).

Reference numeral 7 denotes a mount mounting screw for fixing the adapter body 1 and the mount 2. Reference numeral 1d is a hole for projecting from the mount surface of the camera body, into which a lens lock pin (not shown) that can move forward and backward in the optical axis direction is inserted.
By inserting the lens lock pin, the phase position in the bayonet engagement is determined. Further, the mount of the interchangeable lens (not shown) is also provided with a hole for the lens lock pin 3 to be fitted and for phase positioning when the adapter and the bayonet are engaged.

Reference numeral 1e is a flange back surface of the camera body, and 2c is a flange back surface of the interchangeable lens.

Reference numeral 8 denotes a pin restriction ring which is sandwiched between the adapter body 1 and the mount 2 and is rotatably supported about the optical axis.

Reference numeral 8a is a projection for contacting with a bayonet claw of the interchangeable lens when the interchangeable lens is attached and rotating the pin regulating ring 8 about the optical axis. Reference numeral 9 denotes a spring for generating an urging force for rotating the pin restriction ring 8 counterclockwise in the figure, one end of which is engaged with a spring retainer 8b attached to the pin restriction ring 8 and the other end of which is engaged with the pin 10. The pin 10 is fixed to the adapter body 1. Also, 8c
Is a stopper portion that abuts the protrusion 1f attached to the adapter body 1 to regulate the rotation of the pin regulating ring 8. Reference numeral 8d denotes a pin regulation protrusion attached to the pin regulation ring 8, which is sandwiched between the engaging portion 4a of the lens unlock knob 4 and the mount 2 when the adapter is a single body, and is in the optical axis direction of the lens replacement lock pin 3. It regulates movement.

FIGS. 4A to 4D are views showing the operation of attaching and detaching the camera body and the interchangeable lens. In FIG. 4A, 11 is a camera body, 12 is a camera mount fixed to the camera body 11, and has a bayonet claw 12a. 13 is an interchangeable lens, 14 is an interchangeable lens mount fixed to the interchangeable lens 13, and a bayonet claw 14
a. Further, it has a hole 14b for engaging with a lock pin protruding from the flange surface of the adapter or the camera body and for performing phase positioning for bayonet engagement.
FIG. 4A shows a state in which nothing is connected to the adapter body 1, and the pin regulation protrusion 8d is sandwiched between the mount 2 and the engaging portion 4a of the lens unlock knob 4, so that the interchangeable lens is used. The movement of the lock pin 3 to the left in the figure is restricted, and the interchangeable lens lock pin 3 projects from the flange back surface 1e. Therefore, the adapter body 1
When the lens is attached to the camera body, the protruding interchangeable lens lock pin 3 hits the camera mount 12 and cannot be attached. However, since the interchangeable lens lock pin 3 is not restricted to move to the right in the figure, the interchangeable lens 13 can be attached to the adapter body 1 because the interchangeable lens lock pin 3 is pushed by the flange surface of the interchangeable lens mount 14 and retracted. (FIG. 4 (B)). Interchangeable lens 13 on the adapter body 1
When mounting, the bayonet claws 14a of the interchangeable lens mount 14 are not attached to the adapter body 1 from the middle of the bayonet engagement.
The pin regulating ring 8 is brought into contact with the projection 8a of the inner pin regulating ring 8 to rotate the pin regulating ring 8 about the optical axis. Then, the pin regulation protrusion 8
Since d also rotates and moves from between the mount 2 and the engaging portion 4a of the lens unlocking knob 4, the interchangeable lens lock pin 3 is not regulated to the left in the figure, and the mount 2 and the engaging portion 4a contact each other. It is moved by the urging force of the spring 5 until it touches,
The interchangeable lens lock pin 3 is inserted into the hole 14b provided in the interchangeable lens mount 14 at the bayonet engagement normal position, and the mounting is completed (FIG. 4 (C)).

Since the interchangeable lens lock pin 3 is deeply fitted into the hole 14b of the interchangeable lens mount 14 and at the same time retracted from the camera side flange back surface 1e of the adapter body 1, as shown in FIG. Since the interchangeable lens lock pin 3 does not protrude from the flange back surface 1e, which is a restriction when the main body 11 is attached to the adapter main body 1, the camera main body 11 can be attached (FIG. 4).
(D)).

When the adapter body 1 is detached from the state where the interchangeable lens 13 and the camera body 11 are attached to the adapter body 1, the above-mentioned order is reversed. Figure 4
In order to remove the camera body 11 from the state of (D), it can be released by operating an unlock button (not shown) provided on the camera body 11, but when removing the interchangeable lens 13 first, Since movement of the interchangeable lens lock pin 3 in the adapter body 1 to the right in the figure is restricted by the mount 12 of the camera body 11, the interchangeable lens lock pin 3 fitted in the interchangeable lens mount 14 cannot be retracted. Therefore, the interchangeable lens 13 cannot be removed.

After removing the camera body 11 first (see FIG.
(C)), since the interchangeable lens lock pin 3 can be moved to the right in the figure by moving the engaging portion 4a of the lens unlock knob 4 to the right in the figure, it is retracted from the hole 14b of the interchangeable lens mount 14. By rotating the interchangeable lens 13 to disengage the bayonet, the interchangeable lens 13 and the adapter body 1 can be removed (FIGS. 4B and 4A).

FIG. 5 is a view showing the state of the lock pin regulating ring 8 when the interchangeable lens 13 is attached to the adapter body 1.

As described above, when connecting the interchangeable lens and the camera body to the adapter, the interchangeable lens →
Power is supplied to these contacts from the camera side with the contacts of the contact point 6 of the adapter exposed, as the camera body and the interchangeable lens can be removed in this order. It is possible to prevent accidents due to short circuits between these contacts. In addition, the above-described structure makes it possible to eliminate the lens detection switch that was conventionally provided in the adapter.

Further, the interchangeable lens lock pin 3 need not be a pin. For example, in the case of an adapter for connecting an interchangeable lens having a different mount diameter to the camera body, the interchangeable lens lock pin 3 is arranged in a crank shape and the optical axis is set. It suffices if they have the same function in each direction.

[0032]

As described above, the one to be supplied with electricity through the adapter device is first attached to the adapter device, and the attachment / detachment is performed in the reverse order. Is prevented from being exposed, and the lens detection switch can be eliminated. Furthermore, when the one that is to be attached first is attached to the adapter device,
By providing the lock member, which can be mounted later, as the mounting order restricting means, the mounting order restriction is surely observed.

Further, by mounting the interchangeable lens on the adapter device and then restricting the camera body to be mounted next, and by attaching and detaching in the reverse order, a power source is provided to the camera body and electricity is supplied to the interchangeable lens from the adapter device. When supplying, the electric contact can be safely supplied without being exposed.

[Brief description of drawings]

1 is a cross-sectional view of an adapter device embodying the present invention.

FIG. 2 is a front view of an adapter device embodying the present invention.

FIG. 3 is an explanatory diagram of a lens unlock knob portion of the adapter device embodying the present invention.

FIG. 4 is a four-step operation of the interchangeable lens lock pin of the adapter device embodying the present invention and the attaching / detaching operation of the camera body and the interchangeable lens: (A), (B), (C), (D). It is the figure divided and explained.

FIG. 5 is a diagram showing an adapter device when an interchangeable lens is attached to the adapter device of this embodiment.

FIG. 6 shows a cross-sectional view (A) and a front view (B) of a conventional adapter device.

[Explanation of symbols]

1 ... Adapter body 2 ... Mount 3 ... Interchangeable lens lock pin 4 ... Lens unlock knob 5 ... Knob spring 6 ... Contact point 7 ... Mount mounting screw 8 ... Pin restriction ring 9 ... Spring 10 ... Pin 11 ... Camera body 12 ... Camera mount 13 ... Interchangeable lens 14 ... Interchangeable lens mount

Claims (3)

[Claims] 1. An adapter device for an interchangeable lens mounted between a camera body and an interchangeable lens, wherein the adapter device is supplied with electricity in the order of mounting the camera body and the interchangeable lens. An adapter device for an interchangeable lens, characterized in that the adapter device is provided with a mounting sequence regulating means that regulates one of them to be mounted on the adapter device first and the other is mounted and removed in the reverse order. 2. The mounting order restricting means is longer than a distance between mount surfaces in contact with the camera body and the interchangeable lens of the adapter device, and is movable back and forth to an opening provided in the optical axis direction between the mount surfaces. 2. The interchangeable lens according to claim 1, wherein the interchangeable lens has a lock member to be fitted, and when the camera body or the interchangeable lens is attached to the adapter device, the lock member moves so that the other can be attached. Adapter device. 3. The mounting order restricting means restricts mounting of an interchangeable lens on the adapter device, mounting of the camera body next, and mounting / dismounting in the reverse order. Item 1. An interchangeable lens adapter device according to item 1 or 2.