JPH0631368Y2 - Surveyor reticle waterproofing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a waterproofing device for a focusing screen used in a surveying instrument such as a level.

[Prior Art] Conventionally, in a surveying instrument, for example, a level or the like, since the collimation line is horizontally adjusted, the focusing screen can be finely adjusted vertically and horizontally. For example, JP-A-58
The technique proposed in Japanese Patent Laid-Open No. 72006 has four adjusting screws, as shown in FIGS. 2 and 3. That is, the adjusting screw 21 penetrates the reticle outer frame 23 and is screwed into the reticle frame 22, thereby supporting the reticle frame 22 and the reticle 24 fixed to the reticle frame 22 and adjusting the line of sight. In order to achieve this, the focusing screen frame 22 is slightly moved.

Further, as shown in FIG. 4, in the technique proposed in Japanese Utility Model Laid-Open No. 61-24719, an adjusting screw 31 and a mounting screw 32 are arranged at two upper and lower positions, and the collimation line is adjusted by these. In addition, the focusing screen frame 33 is fixed by pressing the projection washer 35 of the focusing screen outer frame 37 using the spring washer 34.

[Problems to be Solved by the Invention] In the technique proposed in Japanese Patent Laid-Open No. 58-72006, the focusing screen frame 22 is adjusted and fixed by the adjusting screw 21, and the number of adjusting screws 21 is large. Not only is it time-consuming to adjust, but there are many places where the adjusting screw 21 is formed, so there is a problem in terms of preventing water from entering.

Further, in the technique proposed in Japanese Patent Laid-Open No. 61-24719, both the adjusting screw 31 and the mounting screw 32 are loosely fitted to the outer frame of the focusing screen and further screwed to the focusing frame 33. When the screws 31 and 32 penetrate the focusing screen outer frame 37, there is a gap between the screws 31 and 32 and the through hole 38, and there is a problem that the waterproofness is insufficient.

As described above, the conventional technique has a problem in that it is poor in waterproofness, and therefore, there are many opportunities for disassembly and cleaning to cope with infiltration of moisture and maintenance and maintenance in which gas is introduced and dried.

An object of the present invention is to provide a focusing screen waterproof device for a surveying instrument which has a simple structure and is excellent in waterproofness.

[Means for Solving the Problems] The present invention has been made to solve the above problems, and a reticle waterproof device for a surveying instrument of the present invention is arranged at the rear part of a telescope body and has a reticle attached. A focusing plate frame, a focusing plate outer frame arranged outside the focusing plate frame, a mounting screw for mounting the focusing plate outer frame and the focusing plate frame, and an adjusting screw for adjusting the focusing plate. Therefore, a waterproof elastic body made of an elastic adhesive is interposed in the gap between the focusing screen frame and the focusing screen outer frame. The elastic adhesive is preferably black.

[Operation] Therefore, by interposing the waterproof elastic body made of an elastic adhesive between the reticle frame and the reticle outer frame, the reticle frame and the reticle outer frame are sealed. , Waterproof to the telescope body. Further, since the waterproof elastic body made of an elastic adhesive is interposed between the focusing screen frame and the focusing screen outer frame, when the adjusting screw is rotated, the focusing screen frame is rotated with respect to the rotating direction of the adjusting screw. The elastic action of the elastic body can be exerted. Therefore, while finely adjusting the position of the focusing screen frame, it is securely fixed. That is, it is possible to prevent deviation in the rotation direction around the adjustment axis and to absorb vibrations and the like because an elastic body is used.

Furthermore, since the black elastic adhesive is used as the elastic adhesive, the diffuse reflection can be prevented by the black color.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, etc. described below do not limit the present invention, and can be variously modified within the scope of the present invention.

FIG. 1 is a cross-sectional view of a focusing screen waterproof device S showing an embodiment of the present invention.
The basic configuration is that an adhesive 7 having waterproofness and elasticity is interposed as a waterproof elastic body in the gap between the focusing screen frame 2 and the focusing screen frame 2.

In FIG. 1, reference numeral 1 is a focusing screen, and the focusing screen 1 is attached to a focusing screen frame 2. The focusing screen frame 2 is supported on the focusing screen outer frame 3 by using adjusting screws 4 and mounting screws 5. In FIG. 1, reference numeral 8 is an eyepiece lens, reference numeral 9 is a lens barrel of an eyepiece lens that holds the eyepiece lens 8, reference numeral 10 is a mounting member that connects the lens barrel 9 of the eyepiece lens 8 and the focusing screen outer frame 3, Reference numeral 11 is a telescope main body, reference numeral 12 is a protective cover attached to the telescope main body 11, and reference numeral 13 is an automatic horizontal correction device provided in the telescope main body 11.

The focusing screen frame 2 of this example is a cylindrical body, and the focusing screen 1 is attached to the eyepiece 8 end side of the focusing screen frame 2. An adjusting screw hole 2a is formed in the upper part of the focusing screen frame 2, and the attaching screw hole 2b is opposed to the adjusting screw hole 2a.
Has been drilled.

The focusing screen outer frame 3 is composed of a cylindrical tubular member having a diameter larger than that of the focusing screen frame 2, and engaging screws 3c and 3d are threaded on both end sides. Further, at a predetermined position on the side portion, that is, at a position aligned with the adjusting screw hole 2a and the mounting screw hole 2b formed in the focusing screen frame 2, the adjusting screw hole having a larger diameter than the adjusting screw hole 2a and the mounting screw hole 2b is provided. 3a and a mounting screw hole 3b are provided. A locking projection 3e that abuts the telescope body 11 is provided around the outer periphery of the outer frame 3 of the focusing plate, and a step portion 2c of the focusing frame 2 is formed inside the cylinder near the main body 11 of the telescope. A projection 3f that abuts is provided around the circumference.

Then, as shown in FIG. 1, the focusing screen frame 2 and the focusing screen frame 3
An adhesive 7 having waterproofness and elasticity is filled in between.
The adhesive used in this example is preferably a black silicone adhesive that does not solidify. This adhesive 7 is used for the focusing screen frame 2
After being attached to the telescope body 11, the adhesive 7 is filled.

By using the adhesive 7 having waterproofness and elasticity as in this example, it is possible to prevent a deviation in the rotation direction that occurs when the mounting screw 5 and the adjusting screw 4 are rotated. In addition, by using the adhesive 7, the focusing screen frame 2 and the focusing screen outer frame 3
Since the space between can be sealed, the telescope body 11
Waterproof between the sides. Further, since the adhesive 7 does not solidify, the focusing screen frame 2 can be slightly moved when adjusting the collimation line. If a black adhesive is used, diffused reflection inside the lens barrel can be prevented.

Although the outer frame of the focusing screen is screwed to the telescope and joined to the telescope in the above embodiment, it may be formed integrally with the telescope body.

[Advantage of the Invention] As described above, the present invention has the waterproof elastic body made of the elastic adhesive interposed between the reticle frame and the reticle outer frame, so that it has only a waterproof effect on the telescope body. However, since the elastic body is used, the elastic body has a restorative effect as a cushioning material, and the focusing screen frame can be reliably fixed, and no complicated fixing means is required.

Further, by using a black elastic adhesive, it is possible to prevent irregular reflection inside the lens barrel.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part including a focusing screen waterproof device showing an embodiment of the present invention, and FIGS. 2 to 4 show a conventional example,
FIG. 2 is a sectional view showing the focusing screen mounting device, FIG. 3 is a sectional view taken along line VV of FIG. 2, and FIG. 4 is a sectional view showing the focusing screen mounting device. DESCRIPTION OF SYMBOLS 1 ... Focus plate, 2 ... Focus plate frame, 3 ... Focus plate outer frame, 4 ... Adjustment screw, 5 ... Mounting screw, 7 ... Elastic adhesive, 11 ... Telescope main body, S ... Focus plate waterproof device.

Claims (2)

[Scope of utility model registration request] 1. A focusing plate frame provided on the rear part of a telescope body and having a focusing plate attached thereto, a focusing plate outer frame disposed outside the focusing plate frame, the focusing plate outer frame and the focusing screen. It comprises a mounting screw for mounting a frame and an adjusting screw for adjusting the focusing screen, and a waterproof elastic body made of an elastic adhesive is interposed in a gap between the focusing screen frame and the focusing screen outer frame. The focus screen waterproof device of the surveying instrument. 2. The focusing screen waterproof device for a surveying instrument according to claim 1, wherein the elastic adhesive is black.