JPS6173136A - Light quantity adjusting device of camera - Google Patents

Abstract

PURPOSE:To adjust a light quantity even under the condition of an overexposure by forming a translucent filter as one body with a lens cap. CONSTITUTION:A light quantity adjusting translucent filter 11 formed as one body with a lens cap 4 is provided so as to be opposed to a lens 2, when the lens cap 4 has been installed to a lens barrel 3. The lens cap 4 tied to camera body 1 with a string 5 is used as a ordinary lens gap for protecting the lens 2 by installing it to the lens barrel 3 so as to cover the lens 2. Also, at the time of overexposure, by installing the lens cap 4 to the lens barrel 3 in the same way, the quantity of a light which is made incident on the lens 2 can be limited by a translucent filter 11. The lens cap 4 is tied to the camera body 1 with the string 5, therefore, the lens cap 4 formed as one body with the translucent filter 11 is not lost.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a light amount adjusting device for a video camera, a general optical camera, etc.

Conventional technology In the past, when taking pictures with a camera, if the lens was overexposed even when the lens was stopped down to its maximum setting, a neutral gray ND filter was attached to the lens barrel to adjust the amount of light, which had a neutral gray color that did not affect the colors captured by the camera. was.

Problems that the invention aims to solve However, carrying an ND filter with you is extremely troublesome, and since the ND filter is screwed into the lens barrel, it takes time to attach and detach it. There was an inconvenience.

The present invention has been made in view of the above drawbacks, and an object of the present invention is to provide a light amount adjusting device that is convenient to carry and can be easily attached and detached.

Means for Solving the Problems The present invention attempts to solve the above problems by integrating a neutral gray translucent filter that does not substantially affect the colors captured by the camera with the lens cap. It is something.

By attaching the functional lens cap to the lens barrel, the amount of light incident on the lens is limited by the semi-transparent filter integrated with the lens cap, and the lens cap can be used as a bait for the camera 17 since it can protect the lens as it is.

Embodiment FIG. 1 is a perspective view showing an embodiment of the present invention, in which 1 is a camera body, 2 is a lens, 3 is a lens barrel into which the lens 2 is fitted, 4r is a lens cap that is detachable from the lens barrel 3, 5 is a string for attaching the lens cap 4 to the camera body 1, and 11 is a translucent filter for adjusting the amount of light that is integrated with the lens cap 4, so that it faces the lens 2 when the lens cap 4 is attached to the lens barrel 3. It is set in. FIG. 2 is a cross-sectional view of the lens cap 4 used in this example.
The lens cap 4 includes a translucent filter made of glass, plastic, etc., and a hood made of resin, etc. The lens cap 4 connects the end of the hood 12 to the lens barrel 3.
It is attached by fitting it into the tip of the

The lens cap 4, which is attached to the camera body 1 by a string 5, is used as a normal lens cap to protect the lens 2 by attaching it to the lens barrel 3 so as to cover the lens 2, and can also be used as a lens cap when overexposure occurs. By attaching 4 to the lens barrel 3, the translucent filter 1
1 can limit the amount of light incident on the lens 2.

Of course, the lens cap 4 may be removed during normal use.

In this embodiment, the lens cap 4 is attached to the camera body 1 by a string 6.
This has the effect that the lens cap 4 with the translucent filter 11 integrated therein will not be lost.

Note that the entire surface of the translucent filter 11 does not necessarily have to be made of glass, etc., as shown in FIG. That's fine. In addition, although this embodiment has been explained using a video camera as an example,
A general optical camera or the like may be used.

Effects of the Invention According to the present invention, since the translucent filter is integrated with the lens cap, it is possible to adjust the amount of light even under overexposure conditions without having to carry a separate item such as an ND filter.

It also has the effect of being extremely easy to put on and take off.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a sectional view of a lens cap. 1... Camera body, 2... Lens, 3...
...Lens barrel, 4...Lens cap, 6...
・・・String, 11 ・・・－・・・Semi-transparent filter, 1
2...7-do.

Claims (1)

[Claims] A light amount adjustment device for a camera, which comprises a translucent filter provided on a portion of the lens cap facing the lens when the lens cap is attached to the lens barrel of the camera to limit the amount of light incident on the lens.