JPS6216898Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lens protection cover, and more particularly, to a lens protection cover for a lens barrel, such as a telephoto lens, whose tip end is a large diameter barrel part.

As is well known, a conventional lens protection cover of this type is constructed as shown in FIGS. 1A to 1C, for example. That is, as shown in FIG. 1, the lens cover 2 of the lens barrel 1, which has a large diameter barrel section 1a at its tip, is made of a flexible material such as leather. It is formed of a bottomed cylindrical body having a circumferential wall 2b slightly longer than the body length of the rear end 2.
A tightening cord 4 (see FIGS. 1B and C) is passed through a cord passing hole 3 provided along the periphery of c.
Both ends of the tightening string 4 are pulled out from a notch 6 in the rear end 2c of the peripheral wall 2b, and well-known tightening tools 5 are inserted into both ends. Therefore, by attaching this lens cover 2 to the tip of the lens barrel 1 and tightening the tightening string 4, the rear end 2c of the lens cover 2 is fixed as shown by the dotted line in FIG. 1A. The lens barrel 1 is contracted inward along the slope of the inclined stepped portion 1b that extends from the large diameter lens barrel portion 1a to the small diameter lens barrel portion 1c, and collides with the slope of the stepped portion 1b (the first
(See Figure C). Therefore, the lens cover 2 does not come out of the large-diameter lens barrel portion 1a of the lens barrel 1, but covers the front surface 2a of the lens in front of the lens (not shown) to protect the lens.

However, such a conventional lens cover 2
However, depending on the shape of the inclined stepped portion of the lens barrel 1, the rear end portion 2c of the lens cover and the stepped portion of the lens barrel 1 may 1b cannot be brought into proper contact with the lens barrel 1, and the tightening tool 5 may loosen and the cover 2 may come off while the lens barrel 1 is being carried around. It had become unsatisfactory.

In view of the above-mentioned points, the object of the present invention is to provide a lens cover that is bent inward at the rear end of the lens cover.
Forming an inwardly flange-like locking portion for preventing the cover from coming off, which accurately abuts against the inclined stepped portion of the lens barrel;
Cut sections are provided at multiple locations on the peripheral wall of the lens cover,
A member for attaching and detaching the cover, such as a fastener, which can be opened and closed, is integrally provided on the peripheral wall of the cut part, and thereby,
To provide an extremely convenient lens protection cover that is detachable and does not come off.

Hereinafter, the present invention will be explained based on the illustrated embodiments.

FIG. 2A is a cross-sectional view showing the lens protection cover 7 according to an embodiment of the present invention in use, and FIG. 2B is a perspective view of the same lens protection cover. The lens protection cover 7 in this embodiment is used for a lens barrel that is exactly the same as the lens barrel 1 shown in FIG. Omitted. The lens protection cover 7 of the present invention is made of a flexible material such as leather that is slightly harder than the conventional lens cover 2 shown in FIG. It is formed into a cylindrical shape having a front surface 7a to cover. This lens protection cover 7
The peripheral wall of the rear end portion is connected to the inclined stepped portion 1 of the lens barrel 1.
It is formed of an inclined edge bent inwardly along the direction b, and serves as an inward-flange-shaped retaining locking portion 7c having approximately the same width as the step portion 1b. As shown in FIG. 2B, the peripheral wall 7b of the lens protection cover 7 including the locking portion 7c is approximately
Two cutting portions 8a and 8b in the optical axis direction are provided with an interval of 120°, and the cutting portions include:
Cover attachment/detachment members 9a and 9b made of well-known openable and closable fasteners are integrally attached to the peripheral wall 7b and the locking portion 7c. Therefore, the cutting portion 8a,
The peripheral wall 7A including the locking part between the fasteners 8b can be pulled outward by pulling down the fasteners 10a and 10b of the cover attaching/detaching members 9a and 9b made of the fasteners to open the same members 9a and 9b. I can do it. It is extremely easy to pull this outward and insert the large-diameter lens barrel portion 1a of the lens barrel 1, and also to cover the large-diameter lens barrel portion 1a with the lens protection cover 7. After that, the above fastener 10
a, 10b and tighten the peripheral wall 7A, the locking portion 7c will be formed on almost the entire surface of the inclined stepped portion 1b of the lens barrel 1, as shown in FIGS. 2A and 2B.
The inner surfaces of the lens protection cover 7 are prevented from moving forward, and the lens protection cover 7 is reliably prevented from coming off the lens barrel 1.

Note that the cut portions 8a and 8b provided on the peripheral wall
Depending on the material and thickness of the lens protection cover 7, it is preferable for the interval to form an angle of about 90° to 180° with respect to the center for opening and closing operations.

As described above, according to the present invention, it is possible to provide a lens protection cover for a lens barrel having a large-diameter barrel portion at the tip, which has good operability and never comes off.

[Brief explanation of the drawing]

FIGS. 1A, B, and C are a sectional view and perspective view showing an example of a conventional lens protection cover, and a perspective view showing a locking mode. FIGS. 2A and B are lenses showing an embodiment of the present invention. FIG. 3 is a cross-sectional view and a perspective view showing a locking mode of the protective cover. DESCRIPTION OF SYMBOLS 1... Lens barrel, 1a... Large diameter lens barrel part, 1b... Inclined step part, 2, 7... Lens protection cover, 7c... Locking part, 8a, 8b... Cutting part, 9a, 9b... Cover attachment/detachment member ( Fuasner).

Claims (1)

[Scope of Claim for Utility Model Registration] In a cap-shaped lens protection cover for a lens barrel having a large-diameter barrel portion at its tip, the large-diameter mirror of the lens barrel is provided at the rear end of the lens protection cover. a locking part for preventing the lens cover from coming off, which is made up of an inwardly inclined edge along an inclined surface step extending from the cylinder part to the small-diameter lens barrel part; a plurality of cutting parts in the optical axis direction provided on the peripheral wall of the lens protection cover; A lens protection cover comprising: a member for attaching and detaching the lens protection cover, such as a fastener, which is integral with the peripheral wall of the lens protection cover and provided at the plurality of cut portions.