JPS6140090B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reticle, and more particularly to a reticle having a split prism in the center.

A focusing plate having a split prism in the center is known, in which the center part is divided into upper and lower parts, and each divided part is formed with a prism projecting toward the right and a prism projecting toward the left. In such a focus plate, a rod-shaped object extending in the vertical direction is separated into left and right parts at the top and bottom. However, it has been impossible to focus on a rod-shaped object extending in the left-right direction. For this reason, the central part is divided into four parts by vertical lines and horizontal lines that intersect at the center, and by providing prisms with slopes that protrude not only in the left-right direction but in various directions in these divided parts, it is possible to
Focus plates have been proposed that are capable of focusing objects that extend in an oblique direction.

An example of this reticle is shown in FIG.

A is a reticle having a prism whose protrusions are directed in the direction of the arrow. If the object shapes are a, b, c on this focus plate, when it is not in focus, Aa, Ab,
As with Ac, it is possible to focus even if the object is not in the vertical direction. The same applies to the focusing plate B.

It is an object of the present invention to provide a reticle with a new configuration compared to the conventional reticle.

In other words, divide the central part into upper and lower parts by a horizontal line,
In a reticle in which a prism protruding toward the right side and a prism protruding toward the left side are formed in each divided portion, the upper and lower divided portions are separated by 3 vertical lines, respectively.
To provide a focusing plate which is divided into three or more parts, and in each of the upper and lower divided parts, a split prism is formed such that the direction in which the slope is projected is bent between the adjacent parts.

The focusing plate of the present invention will be explained below using FIGS. 2 and 3. In FIG. 2, 1 is a reticle, and 2 is a central portion. FIG. 2 is a perspective view of the central part of FIG. 1.
The center of this central portion coincides with the optical axis of the photographic lens.

The central portion 2 is divided by a horizontal line 3 and further by vertical lines 4, 5, and split prisms D, E, F, G, H, and I are formed in each divided portion.

The direction in which the slopes of these split prisms protrude is as indicated by the arrows in the figure. In the upper part, D is the upper left, E is the lower left, and F is the upper left. The directions in which the slopes of these split prisms protrude are generally to the left, and between the adjacent prisms there is an upward and downward direction. At the bottom, G is at the lower right, H is at the upper right, I is at the lower right, and the prisms generally protrude in the opposite direction to the upper part, and are bent in the vertical direction between adjacent prisms.

Using a focus plate with such a configuration, objects a, b,
The appearance when observed in c is shown in Ca, Cb, and Cc.

Since the focusing plate of the present invention has the above configuration,
It has the same effect as a conventional focus plate on rod-shaped objects extending vertically, and also has the effect of periodically deforming rod-shaped objects extending left and right in a wave-like manner, making focusing easier. has advantages.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the oblique direction of the split prism and the appearance of the object shape when it is out of focus, Fig. 2 is a diagram showing the focusing plate of the present invention, and Fig. 3 is a diagram showing the central portion of the focusing plate of the present invention. It is a figure which shows the perspective view of. In the figure, 1 is a focusing plate, 2 is a central portion, 3 is a horizontal line, and D, E, F, G, H, and I are slopes.

Claims (1)

[Scope of Claims] 1. In a reticle in which the central part is divided into upper and lower parts along a horizontal line, and each divided part is formed with a prism protruding toward the right and a prism protruding toward the left, the upper and lower divided parts are arranged vertically. A focal point divided into three or more parts by a line, and each of the upper and lower divided parts is formed with a split prism in which the protruding direction of the slope is bent between adjacent parts. Board.