Interpupillary distance adjustment mechanism for binoculars

Abstract

Provided is an interpupillary distance adjustment mechanism for binoculars that can adjust the interpupillary distance of the binoculars while maintaining the parallelism of the optical axes, although it is a mechanism that can be processed easily. 【Solution means】A round bar front 5 and a round bar rear 6 parallel to the base right 3 on which the telescope right 1 is placed are provided. The base left 4 on which the telescope left 2 is placed is provided with circular holes that fit into the round bar front 5 and the round bar rear 6, and two-plane processing is performed on the sliding regions of the round bar 5 or the round bar 6.

Description

Technical Field

[0001] The present invention relates to an interpupillary distance adjustment mechanism for binoculars.

Background Art

[0002] Binoculars need to adjust the distance between the left and right telescopes while keeping their optical axes parallel to match the distance between the user's eyes (interpupillary distance). Conventional binoculars can adjust the interpupillary distance by connecting the left and right telescopes with a rotating shaft parallel to the optical axis and swinging them, or by moving the left and right telescopes parallel to the optical axis.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventional binoculars had the following drawbacks. (a) High machining accuracy is required for the mechanism part. (b) It was difficult to initially adjust so that the optical axes of the left and right telescopes were always parallel even when the interpupillary distance was adjusted. The present invention was made to eliminate these drawbacks.

Means for Solving the Problems

[0005] One side of the pedestal of the telescope is provided with two round bars that are orthogonal to the optical axis direction of the telescope and parallel to each other, and the pedestal of the other telescope is provided with circular holes that fit with the round bars so that the left and right telescopes can move parallel to each other. There are errors in the distance and parallelism between the two round bars, and they do not match the fitting holes as they are. Therefore, it is characterized in that two planes are provided in the region where the round bars slide with the fitting holes to absorb the error in the distance between the two round bars.

Effects of the Invention

[0006] According to the present invention, it is possible to adjust the eye width of binoculars while maintaining a predetermined parallelism, although the mechanism only requires simple processing.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

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Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0008] FIG. 1 is a perspective view of binoculars according to an embodiment of the present invention, FIG. 2 shows the left side thereof, and shows a state in which two planes are provided on the front of the round bar 5. FIG. 3 shows a state of the embodiment of the present invention shown in FIG. 1 seen from above, with the upper part showing the case where the eye width is narrowed and the lower part showing the case where the eye width is widened. FIGS. 4 and 5 show an example that does not meet the requirements of the present invention, and in response to the interval error between the round bar 5 and the round bar 6 provided on the right side of the pedestal 3, the fitting hole of the pedestal 4 on the left is made into an oval hole. However, compared with a simple circular hole, it is difficult to process an oval hole with high precision, and there is a problem that the parallelism of the optical axis is disturbed when the eye width is adjusted. FIGS. 6 and 7 show an application example of the present invention, in which the lever 7 is pressed against the round bar 6 by the spring 8, and the generated frictional force can keep the eye width of the binoculars constant. When changing the eye width, push up the lever 7 to release the frictional force.

Description of symbols

[0009] 1 Right telescope 2 Left telescope 3 Right pedestal 4 Left pedestal 5 Front round shaft 6 Rear round bar 7 Lever 8 Spring

Claims

1. A binocular eye-width adjustment mechanism comprising two parallel round bars on the base of one telescope and two holes for fitting with the round bars on the base of the other telescope.

2. The binocular eye-width adjustment mechanism according to Claim 1, characterized in that two planes are machined in the region where the round bar slides in the fitting hole.

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