JPS5837042Y2 - Lens barrel with mounting position change device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lens barrel with a mounting position changing device for a camera lens, an enlarger lens, etc., having a screw mount I.

Conventional methods for determining the mounting position of a lens having a screw mount include a cap nut method and a method in which the lens is fixed in an arbitrary direction using a clamp knob.

However, all of these structures require a member outside the lens barrel in addition to the part for attaching and detaching the lens, which increases the size of the lens barrel and poses difficulties in operability.

Further, if there is not enough space near the lens attachment part of an enlarger, etc., there is a drawback that the lens cannot be used because the lens cannot be attached or detached.

The present invention aims to eliminate the above-mentioned drawbacks, that is, to provide a lens barrel in which the position of the lens after attachment can be changed by simply operating a detachable ring, similar to the operation of lenses with general threaded mounts. With the goal.

Hereinafter, the present invention will be explained with reference to drawings showing embodiments of the present invention.

Both the front group lens section 1 and the rear group lens section 2 are screwed and fixed to female threads cut at the front and rear of the lens barrel 5.

Aperture numbers (not shown) are displayed on the aperture ring 3, which can be set by clicking, and is cylindrically fitted to the lens barrel 5. As is well known, members inside the lens barrel are rotated via an aperture interlocking pin, and the aperture blades 3a are rotated. Adjust.

The detachable ring 4 is fixed to the lens barrel 5. As shown in FIG. 2, which is a cross-sectional view taken in the direction of the arrows in FIG. 1, the detachable ring 4 is formed with a rotational nip portion 4a, a rotation restriction portion 4b when the lens is attached, and a rotation restriction portion 4C when the lens is removed.

Compression springs 9 are installed at three equal locations on the side of the lens barrel 5.
, a piece 8, and a click bearing 7, which together with a groove 6a to be described later constitute a click stop device.

Reference numeral 6 denotes a lens screw mount I member which is fixed to the lens barrel 5 against movement in the axial direction and is also fitted rotatably.

And the rotational nip portion 4a of the lens barrel 5 of the mount member.
At the end of the side facing the click stops 7 to 9, click grooves 6a are equally formed in four places, and a rotation limiting pin 6a is protruded to fit into the rotation nib 4a.

These 4a, 4b, 4C, and 6b constitute a rotation limiting device having a predetermined permissible rotation range.

With such a configuration, when attaching this lens barrel to the enlarger body or camera body (not shown), the attachment/detachment ring 4 can be held and rotated, and the lens barrel can be rotated through the rotation restriction portion 4b and the rotation restriction pin 6b. The rotation is transmitted to the lens thread mount member 6, which can be screwed onto the lens thread mount.

In case of removal, it is done in the same manner as described above, and the rotation limiter 4 is removed.
Needless to say, b changes to 4C.

Next, when changing the mounting position after attaching the lens, rotate the detachable ring 4 in the direction in which the rotation limiting portion 4b or 4C separates from the rotation limiting pin 6b, and the click stops 7 to 9 engage with the click grooves 6a ( In this example, the circumference is 12
You can change the position of each location.

As described above, according to the present invention, the observation position of the set aperture value can be changed over approximately 360 degrees.

Therefore, regardless of the mounting condition of the lens, the set aperture value can be viewed at the optimal (easy-to-see) position.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a lens barrel with a mounting position changing device according to the present invention, FIG. 2 is a sectional view taken along the arrow in FIG. 1, and FIG. 3 is a front view of a spring mount member. Explanation of symbols of main parts 1...Front group lens section,
2... Rear group lens section, 3... Pattern ring, 4... Detachable ring, 4a... Rotating nigga part, 4 b, 4 C・・・・・・Rotation limiter,
5... Lens barrel, 6... Screw mount member, 6a... Click groove, 6b... Rotation limit pin, 7... Click bearing, 8...piece Click stop 9...compression spring

Claims (1)

[Scope of utility model registration request] A screw mount member is provided on the lens barrel body so as to lock movement in the axial direction and rotate, and a click stop device and a predetermined rotation are provided between the lens barrel body and the screw mount member. A lens barrel with a mounting position changing device provided with a rotation limiting device having an allowable range.