JPH07333703A - Mount device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a mounting device in which a mount member on the first object side is coupled with a mount member on the second object side by turning in one direction and both objects are separated by turning in the other direction, To obtain a high-strength mounting device at a low cost, which does not deform the lock hole diameter even if it receives a pressing force. The mount member 1 on the side of the first object is made of metal, and the lock hole member 3 provided in the mount member 1 at the time of coupling is formed by another member having higher strength than the mount member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting device for optical equipment such as a camera body, an interchangeable lens, an intermediate tube, and a converter.

[0002]

2. Description of the Related Art Conventionally, for example, a mount device for removably assembling a lens barrel of a camera body has a bayonet structure, but one mount (camera body side) is mounted so as to be locked when the mounting is completed. The member is provided with a lock pin, the other (lens barrel side) mount member is provided with a lock hole, and the lock pin is fitted into the lock hole.

[0003]

Since the conventional mounting device is constructed as described above, the interchangeable lens has a large aperture and a long focal length, and despite its considerable weight, The same member is used for the mount member and the mount locking member on the lens barrel side. For this reason, particularly, the lock hole integrally formed with the mount member is pressed by the lock pin, and the hole wall is likely to be indented and often damaged. For example, since the lock hole diameter is insufficient in strength, the lock pin expands by receiving a local pressing force from the lock pin, causing play between the lock pin and the lock pin, which impedes functions such as rotation operation of the lens barrel. In some cases, the locking may be incomplete.

Further, in order to improve the strength of the lock hole, it is possible to use a material having a high strength as the material of the mount member. However, since the mount member has many cutting portions, the machinability is deteriorated and the manufacturing cost is low. There was a problem of rising.

Therefore, as disclosed in, for example, Japanese Patent Laid-Open No. 3-231726, in the case of a light-weight interchangeable lens barrel, a mount member is formed of a plastic material, and a lock hole is formed as a separate member to enhance strength. However, since this mount member is a small and lightweight lens barrel, it is premised on the strength of plastic materials.For example, it is used as a lens barrel mounting device for large and heavy interchangeable lenses with a large aperture and long focus. Was not applicable.

It is an object of the present invention to obtain a mounting device which solves the above-mentioned conventional problems.

[0007]

In the mounting apparatus according to the present invention, the mount member on the first object side is coupled with the mount member on the second object side by rotating in one direction, and both mounts by rotating in the other direction. In the mounting device for disengaging, the mount member on the first object side is made of metal, and the lock hole member at the time of coupling provided in the mount member is formed of another member having higher strength than the mount member, It is possible to obtain a mounting device with high cost at low cost.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. 1 is a perspective view showing a mount member 1 on the lens barrel side of an interchangeable lens, FIG. 2 is an enlarged view of a lock hole portion of the mount member, FIG. 2A is a plan view, and FIG. It is a figure.

In FIGS. 1 and 2, 1 is a mount member on the lens barrel side of an interchangeable lens as a first object, 1a is a bayonet claw portion, and 1b is a screw hole for fixing the mount member 1 to the lens barrel. Reference numeral 2 denotes a stopper pin for limiting the rotation when the mount member 1 is mounted on the mount member on the camera body side, and is fixed to the mount member 1 with screws or caulking.

Reference numeral 3 denotes a lock hole member for mounting and mounting the mount member 1 on the mount member on the camera body side, for example, high carbon steel such as tool steel hardened by heat treatment such as quenching. It is formed of a high-strength material such as or nickel chrome steel, and is press-fitted into the mounting hole 1c of the mount member 1. Reference numeral 3a denotes an elongated hole formed in the lock hole member 3. The elongated hole 3a has an oval shape that is long in the radial direction around the optical axis of the lens, and absorbs the eccentricity due to the fitting backlash due to manufacturing error. To do. 3b is a press-fitting dimension portion for press-fitting the lock hole member 3 into the mounting hole 1c of the mount member 1, 3
Reference numeral c is a step of the abutting portion for positioning when the lock hole member 3 is press-fitted into the mounting hole 1c of the mount member 1.

When the lock hole member 3 is press-fitted into the mounting hole 1c of the mount member 1, the elongated hole 3a is positioned in the radial direction with the optical axis of the mount member 1 as a center, so that the rotation of the lock hole member 3 is restricted by, for example, a mounting tool. Is configured.

FIG. 3 is an enlarged cross-sectional view of an essential part of the state where the mount member 1 is mounted on the mount member 10 on the camera body side as the second object. Reference numeral 11 is a lock pin for locking after the lens barrel is attached to the camera body, 12 is a lock pin guide plate, and 13 is a lock pin spring made of a compression coil spring. The lock of the mount member 1 is released by sliding the lock pin 11 in the opposite arrow direction.

The operation of attaching and detaching the lens barrel to and from the camera body in the configuration of the above embodiment will be described. When the lens barrel is attached to the camera body, when the lens barrel is rotated so as to be coupled to the bayonet, the mount member 10 on the camera body side is mounted.
The lock pin 11 is inserted into the lock hole 3a of the lock hole member 3 of the mount member 1 of the lens barrel by the action of the spring 13. At this time, at the same time, the stopper pin 2 of the mount member 1
Is configured to come into contact with a bayonet claw (not shown) on the camera body side. However, in actuality, a slight deviation occurs due to a manufacturing error, so that the lock pin 11 is prevented from being fitted into the lock hole 3a. The stopper pin 2 is always designed to come into contact with the lock pin 11 later than the lock pin 11 is fitted into the lock hole 3a.

With the above construction, when a large and heavy lens barrel is mounted on the camera body, the lock pin 11 is usually inserted into the lock hole 3a prior to the rotation stopper pin 2 so that the lens barrel The rotation is stopped and a large force is applied to the lock pin 11 and the lock hole 3a. Further, when the mount member 10 is rotated in the detaching direction after mounting, since a particularly large lens barrel is fixed by a tripod or the like, a grip or the like of the camera body is held and a rotational force about the optical axis is applied to the mount member 1. Since the vertical and horizontal frames are changed by transmitting the force through the lock, a large force is applied to the lock pin 11 and the lock hole 3a.

However, since the lock hole member 3 is made of high carbon steel or the like which has been hardened by heat treatment such as quenching, no indentation occurs even if a large pressure is applied through the lock pin 11. There is almost no backlash.

Further, in order to prevent the rotational play of the mount member from increasing, not only the strength of the lock hole member 3 but also the
It is desirable to increase the strength of the lock pin 11 as well.

[0017]

As described above, according to the present invention, the lock hole member made of another material having a higher strength than the mount member is press-fitted into the mounting hole of the mount member formed by cutting the metal. Therefore, it is possible to improve the strength of mount coupling in a large and heavy lens barrel.

Further, since it is only necessary to provide a mounting hole with a seat in a part of the mount member and press fit a lock hole member made of another material having high heat treatment to this mounting hole, the material having high strength is cut. There is an effect that it can be manufactured more easily and cheaper than the manufacturing method.

[Brief description of drawings]

FIG. 1 is a perspective view of a mount member that is a component of a mount device according to the present invention.

FIG. 2 is an enlarged view of a main part of the mount member of FIG.
(A) is a front view, (b) is a cross-sectional view.

FIG. 3 is an enlarged cross-sectional view of a main part showing a coupled state of a lens barrel-side mount member and a camera body-side mount member.

[Explanation of symbols]

 1 Mount member 2 Stopper pin 3 Lock hole member 11 Lock pin

Claims (5)

[Claims] 1. A mounting device in which a mount member on a first object side is coupled with a mount member on a second object side by rotating in one direction, and both objects are separated by rotating in another direction. The mount device is made of metal, and the lock hole member provided at the mount member for coupling is formed by another member having higher strength than the mount member. 2. The mount device according to claim 1, wherein the lock hole member has strength equal to or higher than that of a lock pin of the mount member on the second object side that engages with the lock hole. 3. The mount device according to claim 1, wherein the lock hole member is press-fitted and fixed in a mounting hole of the mount member. 4. The mount device according to claim 1, wherein the hole of the lock hole member has an elongated hole shape in a radial direction about the optical axis. 5. The mount device according to claim 1, wherein the lock hole member has a positioning step portion in the optical axis direction.