JPS63191136A - Replacing lens adaptor for electronic camera - Google Patents

Abstract

PURPOSE:To make it possible to apply a replacing lens barrel for a silver salt film camera to an electronic camera body by transmitting a physical variable corresponding to a replaced variable transmitted from the electronic camera body through a 1st coupling part to a movable part in a replacing lens through a 2nd coupling part. CONSTITUTION:Under the unitedly mounted state of an replacing lens adaptor 2 and the replacing lens barrel 3 on the electronic camera body 1, respective driving motors 6, 8, 10 in the adaptor 2 are driven by the operation of the electronic camera body 1 side and a sequence command and the united body of the adaptor 2 and the lens barrel 3 executes a similar function to that of a lens barrel to be exclusively used for the electronic camera. Consequently, the replacing lens barrel of the silver salt film camera can be applied to the electronic camera.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an interchangeable lens adapter for an electronic camera, and more particularly to an adapter for using an interchangeable lens for a regular silver halide film camera in an electronic camera body.

[Prior Art] Generally, electronic cameras use lens barrels specifically designed for electronic cameras, and the interchangeable lens barrels used for regular silver halide film-eye reflex cameras are not compatible with electronic cameras. did not have. The reason for this is that in the case of electronic cameras, the aperture drive source and shutter are installed inside the lens barrel exclusively for electronic cameras, but in the case of silver halide film cameras, they are installed in the camera body and are installed in the interchangeable lens barrel. This is because it is generally not provided inside the cylinder. In addition, electronic cameras use autofocus (hereinafter referred to as A).
The lens drive motor for the camera (abbreviated as F) was also built into the lens barrel side due to space limitations in the electronic camera body.

[Problems to be Solved by the Invention] Incidentally, it goes without saying that both the lens barrel of an electronic camera and the lens barrel of a silver-salt film camera do not allow the optical system to reach the light-receiving surface of the solid-state imaging element or the film surface. Since they are common in that they form images of subject light, it would be very economical and effective if the lens barrel of a silver halide film camera could also be used as the lens barrel of an electronic camera. In particular, now that electronic cameras are becoming as popular as silver halide film cameras, it is highly desirable for users to be able to use various interchangeable lens barrels for their single-lens reflex cameras.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an interchangeable lens adapter for an electronic camera that allows an interchangeable lens barrel for a silver halide film camera to be applied to an electronic camera body.

[Means and effects for solving the problems] The electronic camera interchangeable lens adapter of the present invention has a primary coupling section that receives a physical quantity corresponding to the displacement amount of the movable section within the interchangeable lens from the electronic camera body. a second coupling section that transmits a physical quantity corresponding to the physical quantity transmitted to the first coupling section to the interchangeable lens; It has a transmission means for transmitting physical quantities related to the amount of displacement, and transmits physical quantities corresponding to the amount of displacement such as aperture drive, shutter drive, lens drive, etc. transmitted from the electronic camera body through the primary coupling part. It is transmitted to movable parts such as the diaphragm, shutter, and photographic lens in the interchangeable lens through the secondary coupling.

[Example] Hereinafter, the present invention will be explained with reference to illustrated embodiments.

1 and 2 show an electronic camera using an embodiment of the interchangeable lens adapter of the present invention. An interchangeable lens barrel 3 for a silver halide film camera is attached to the mount part of the electronic camera body 1 via the interchangeable lens adapter 2 of this embodiment.
is installed.

The electronic camera body 1 is a camera body of an AF electronic camera with a set of lens shutters. Therefore, although the dedicated lens barrel attached to this electronic camera body 1 originally has at least a built-in lens drive motor and a shutter drive mechanism, it is used in place of the dedicated lens barrel for this electronic camera. The above-mentioned interchangeable lens barrel 3 for a silver halide film camera does not incorporate a lens drive motor, a shutter, or its drive mechanism. That is, the interchangeable lens barrel 3 was originally attached to an AP camera body with a focal-brain shutter set, and the photographing lens in the lens barrel 3 was driven by a lens drive motor in the camera body. Only a lens drive shaft 4 having a lens drive gear 5 is provided inside the cylinder 3.

Therefore, as shown in FIG. 1, the interchangeable lens adapter 2 of this embodiment, which is interposed between the electronic camera body 1 and the interchangeable lens barrel 3, includes a lens drive motor 6, a shutter unit 7, A shutter drive motor 8 and the like are built-in. Further, in this embodiment, as shown in FIG. 2, an aperture drive mechanism 9 and an aperture drive motor 10 are built-in. Naturally, conversion lenses 11 and 12 are also built in to perform optical correction in order to properly focus the image taken by the photographing lens in the lens barrel 3 onto the light receiving surface of the solid-state image sensor in the electronic camera body 1. It is placed on the optical axis.

The interchangeable lens adapter 2 and the electronic camera body 1 are attached to each other by bayonet-type mounts 2a and 1a, and conductive contacts 13.1 are attached to each mounting surface.
4 are arranged facing each other. The contact 13 on the camera body 1 side is urged by a spring 15 in the direction of protruding from the mount surface, and is in contact with the fixed contact 14 on the adapter 2 side. The contact 13 on the electronic camera body 1 side is originally a lens drive motor that connects the electronic camera body 1 side to the lens barrel dedicated to the electronic camera.

They are used to send out drive control signals for the shutter drive motor, aperture drive morph, etc., and a plurality of pairs are provided. Therefore, the contact 1 on the interchangeable lens adapter 2 side
A plurality of pairs of contacts 4 are also provided corresponding to the contacts 13.

The plurality of pairs of contacts 13, 14 are respectively connected to the lens drive motor 6, printer drive motor 8, aperture drive motor 10, etc. within the adapter 2.

Further, this interchangeable lens adapter 2 and the above-mentioned interchangeable lens barrel 3 are also provided with bayonet-type mounts 2b and 3a.
It is piped by. The rear end portion of the lens drive shaft 4 within the interchangeable lens barrel 3 protrudes through the mount 3a of the lens barrel 3, and has a joint portion 4a formed at its tip.

Joint portion 4a of lens drive shaft 4 of this lens barrel 3
is originally connected to the joint portion of the driving force transmission shaft of the lens drive motor of the silver halide film AF camera body. Therefore, in this case, the transmission shaft 16 is also provided in the interchangeable lens adapter 2, and the joint portion 16a formed at the tip of the transmission shaft 16 is connected to the adapter 2.
It is exposed from the mount 2b and faces the joint portion 4a on the interchangeable lens barrel 3 side. This transmission shaft 16 is
A gear 17 fixed to the rear end meshes with a gear 18 fixed to the output shaft of the lens drive motor 6, and rotates by being transmitted with the driving force of the lens drive motor 6. Transmission shaft 16
is slightly movable in the axial direction, and a coil spring 20 is interposed coaxially between a stopper 19 fixed to the body frame of the interchangeable lens adapter 2 and the joint portion tea.

Therefore, due to the elasticity of the coil spring 20, the joint portion 16a of the transmission shaft 16 is urged toward the joint portion 4a of the lens drive shaft 4, and both joint portions 4a, 16a are replaced as shown in the figure. To easily and reliably connect a lens barrel 3 and a lens adapter 2 when they are assembled. Further, the interlocking claw 21a at the tip of the diaphragm interlocking member 21 connected to the aperture in the interchangeable lens barrel 3 protrudes through the mount 3a of the lens barrel 3. Since the interlocking claw 9a of the aperture drive mechanism 9 inside the lens adapter 2 is provided to protrude from the mount 2b of this lens adapter 2, both interlocking claws 21a and 9 are attached when the interchangeable lens barrel 3 and the lens adapter 2 are attached.
a is engaged.

In this manner, with the interchangeable lens adapter 2 and the interchangeable lens barrel 3 integrally attached to the electronic camera body 1, each of the drive motors 6, 13, and 10 in the interchangeable lens adapter 2 are all connected to the electronic camera body. The interchangeable lens adapter 2 and the interchangeable lens barrel 3 are driven by the operation of the electronic camera and the sequence command, and the interchangeable lens adapter 2 and the interchangeable lens barrel 3 function as one, instead of a lens barrel dedicated to an electronic camera. In other words, when you release the camera from the electronic camera body 1 side, first,
When the aperture and shutter are open, the lens drive motor 6
A lens drive control signal is sent to the transmission shaft 6 and the joint 16 through the contactors 13 and 14.
The lens drive shaft 4 connected via a and 4a rotates,
The photographing lens inside the interchangeable lens barrel 3 is driven. The AF sub-control at this time is performed, for example, by detecting a focus state signal from the output of the solid-state image sensor 22 in the electronic camera body 1 and feeding back this focus state signal to the lens drive control signal.

After the photographic lens reaches the in-focus position by the AF sub-control, an aperture drive control signal is sent to the aperture drive motor 10 through the contacts 13 and 14. Then, the diaphragm drive mechanism 9 is driven by the rotation of the motor 10, and the interlocking claws 9a, 21a
The aperture in the interchangeable lens barrel 3 is narrowed down to a predetermined aperture value through the aperture.

After the mirror is raised (the mirror is not shown), the shutter drive motor 8 is connected to the contacts 13 and 14.
When a shutter drive control signal is sent through the shutter drive control signal, the shutter unit 7 is actuated by the rotation of the motor 8, and the shutter in the unit 7 opens and closes at a predetermined shutter time according to the shutter drive control signal to complete the photographing. .

FIG. 3 shows an interchangeable lens adapter according to another embodiment of the present invention.

In this embodiment, the aperture drive mechanism is different from the previous embodiment. Therefore, since the shutter drive and lens drive mechanisms (not shown) are the same as those in the previous embodiment, their explanations will be omitted. The electronic camera body 31 to which the interchangeable lens adapter 32 of this embodiment is applied has a built-in aperture drive motor 33, and a small gear 34 integrated with the output shaft of the motor 33 is
Originally, it meshed with the aperture drive gear of the lens barrel dedicated to this electronic camera body. This interchangeable lens adapter 32 is used to apply the interchangeable lens barrel 3 of the silver halide film camera used in the above embodiment to such an electronic camera body 31.

A ring-shaped gear 35 having teeth formed on the inner periphery is rotatably disposed in the lens adapter 32 at a position close to the mount 32b. A portion of the front end surface of this gear 35 protrudes to form an interlocking pawl 35a that engages with the interlocking pawl 21a on the side of the interchangeable lens barrel 3. A small gear 36 meshes with the gear 35. This small gear 36 is rotatably supported by a bearing member (not shown) and is fixed to the front end of a transmission shaft 37 arranged parallel to the optical axis. A small gear 38 is fixed to the rear end of the transmission shaft 37, passing through the mounts 32a and 31a and meshing with the small gear 34 on the electronic camera body 31 side.

In this embodiment, when the interchangeable lens adapter 32 and the interchangeable lens barrel 3 are combined and attached to the electronic camera body 31, the aperture drive motor 33 inside the electronic camera body 31 is
When driven by the aperture drive control signal, pinion gear 34.
Rotation is transmitted to the transmission shaft 37 via 38, and the small gear 36
Since the gear 35 rotates, the interlocking pawl 35 pushes the interlocking pawl 21a and narrows down the aperture inside the interchangeable lens barrel 3.

As described above, in this embodiment, since the driving part for the aperture is provided on the electronic camera body side, the interchangeable lens adapter 32 is provided with only the aperture transmission mechanism. This interchangeable lens adapter 32 is not only applicable to the electronic camera body 31 having the aperture drive motor 33, but also has a built-in mechanical aperture drive mechanism, which applies aperture drive force to the small gear 38. It can also be applied to electronic camera bodies such as electronic cameras.

An aperture transmission mechanism of an interchangeable lens adapter that can be applied to an electronic camera body having a built-in mechanical aperture drive mechanism may have a configuration as shown in FIG. 4, for example. That is, the aperture transmission mechanism shown in FIG. 4 includes an annular gear 35 having an interlocking pawl 35a similar to that of the above embodiment, located close to the mount facing the interchangeable lens barrel 3.
A small gear 38A is fixed to the rear end of a transmission shaft 37A having a small gear 36 that meshes with the gear 35. This small gear 38A meshes with an annular gear 39, substantially similar to the annular gear 35, which is rotatably disposed near the mount facing the electronic camera body. A notch 39a is formed in a part of the front end of this gear 39, and an aperture drive pawl 40 inside the electronic camera body engages with the notch 39a. Therefore, the interchangeable lens adapter with this aperture transmission mechanism is
This is applied to an electronic camera body having an aperture drive claw 40. Note that the aperture drive claw 40 may be driven by either a mechanical aperture drive mechanism or an aperture drive motor.

[Effects of the Invention] As described above, by using the interchangeable lens adapter of the present invention, the interchangeable lens complexity of silver halide film cameras can be applied to electronic cameras, and the scope of application of electronic cameras is greatly expanded. Expanded.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an interchangeable lens adapter showing an embodiment of the present invention; Fig. 2 is a partial sectional view of different parts of the interchangeable lens adapter shown in Fig. 1; , a sectional view of an interchangeable lens adapter showing another embodiment of the present invention; FIG. 4 is a perspective view showing a modification of the aperture drive mechanism in FIG. 3; i, ai......Electronic camera body 2.32.
......Interchangeable lens adapter 3...
...Interchangeable lens barrel 4a, 1 [ia...
Joint part (secondary coupling part)

Claims (1)

[Claims] A primary coupling section that receives a physical quantity that corresponds to the amount of displacement of a movable part within the interchangeable lens from the electronic camera body; a secondary coupling section that transmits a physical quantity to the interchangeable lens; and a transmission means that transmits a physical quantity related to the displacement amount from the primary coupling section to the secondary coupling section. An interchangeable lens adapter for electronic cameras.