Structure for installing optical filters with respect to blade of diaphragm

Abstract

A structure for installing optical filters with respect to a blade of diaphragm, by which the optical filters can be positioned correctively with respect to the blade of diaphragm through minimum positioning structures so as to implement simplification of the shape of the optical filters and the blade of diaphragm and facilitation of installing process of the optical filters, wherein the implementation is relatively easy. The optical filters are designed into a planar shape in approximately rectangle having a front edge, a left edge, a right edge and a rear edge as peripheral edges. A U-shaped opening is formed on the left and the right edges of the optical filter, and a projection portion is formed on the blade of diaphragm. The optical filter can be positioned in a front-and-rear direction and a left-and-right direction through fastening the same into the U-shaped openings of the optical filter. The projection portion is a projection portion in hemispherical shape by punching a resin thin board as a blank from the lateral side on the back. And optical filters are positioned relatively to blades of diaphragm by fastening the opening to the projection portion. Under such a condition, optical filters are combined with the blade of diaphragm by coating binder at the rear edge of the optical filter.

Description

technical field [0001] The present invention relates to an attachment structure of an optical filter when an optical filter is attached to an aperture blade incorporated in an aperture device for optical equipment such as a video camera, a still camera, and a monitor. Background technique [0002] In the diaphragm device for adjusting the amount of light, the smaller the diameter of the diaphragm, the smaller the amount of movement of the diaphragm blades for adjusting the same amount of light. Therefore, higher-precision movement control of the diaphragm blades is required, and the control becomes more difficult. Therefore, when the aperture of the aperture is reduced, by inserting a filter (light reduction filter = ND filter) in the opening of the aperture to expand the actual aperture of the aperture, the aperture of the aperture is improved when the aperture is small. Control resolution. [0003] Specifically, a small piece of ND filter is attached to the opening side ...

AI Technical Summary

Problems solved by technology

[0011] However, Image 6 In the case of the mounting structure, since it is necessary to position the ND filter 220 relative to the diaphragm blade 210 in four directions, front, rear, left, and right, the four notches 226, 227 must be positioned and engaged with the four protrusions 216, 217, However, due to too many positioning positions, I am worried that it will take man-hours for alignment

In addition, due to the large number of protrusions 216, 217 or notches 226, 227, the shape of the diaphragm blade 210 or the ND filter 220 is relatively complicated, which may lead to an increase in cost.

In addition, it is difficult to form the small protrusions 216, 217 on the surface of the diaphragm blade 210 made of an extremely thin material, and there is also a problem that it is difficult to realize.

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