KR100304039B1 - Eyepiece cover of optics - Google Patents

Abstract

The eyepiece cover of the optical device mounted on the eyepiece of the optical device has a hollow cylindrical shape, and an air hole is formed from the inner circumferential side to the outer circumferential side thereof.

Description

Eyepiece cover of optics

1 is a cross-sectional view of the eyepiece portion of the first embodiment according to the present invention and the eyepiece cover mounted thereon.

2 is a cross-sectional view of the eyepiece portion of the second embodiment according to the present invention and the eyepiece cover mounted thereon.

3 is a cross-sectional view of the eyepiece portion of the third embodiment according to the present invention and the eyepiece cover mounted thereon.

4 is an explanatory diagram showing air flow in the eyepiece cover of the third embodiment according to the present invention;

5 is a front view of the binoculars of the first embodiment according to the present invention.

6 is a cross-sectional view of a conventional eyepiece and an eyepiece cover attached thereto.

* Explanation of symbols for main parts of the drawings

1 eyepiece 2 body casing

10, 10a, 10b: Eyepiece cover 11: L-shaped air hole

30: eyepiece frame 30a: eyepiece frame

31: Male thread 35: Eyepiece outer frame

36: female thread

[Industrial use]

The present invention relates to an eyepiece cover of an optical device mounted to the eyepiece of the optical device.

[Prior art]

As the eyepiece cover of the conventional optical apparatus, for example, there is one shown in FIG.

The eyepiece cover 10f is mounted on a binocular which is an optical device, and forms a hollow cylindrical shape. One end of the eyepiece cover 10f is attached to the eyepiece 5 of the binoculars, and the other end comes in contact with the eyes of the observer. For this reason, when the viewer sees the binoculars, the inner circumferential side space S of the eyepiece cover 10f is covered by the eyepiece 5, to which the eyepiece 1 is assembled, and the observer, and is close to the closed state.

[Problems to Solve Invention]

However, in such a prior art, when the optical device is viewed under a cold environment, the air in the inner peripheral space S of the eyepiece cover 10f rises to the observer's body temperature. Therefore, the temperature difference between the eyepiece 1 in the cold state and the air in the inner peripheral space S is generated. As a result, in the prior art, when the air in the inner circumferential space S raised to the observer's body temperature contacts the cold eyepiece 1, the air is cooled, and moisture in the air is condensed on the eyepiece 1 There is a problem that the eyepiece 1 is blurred.

SUMMARY OF THE INVENTION The present invention has been made with respect to such a conventional problem, and an object of the present invention is to provide an eyepiece cover in which the eyepiece is not blurred even when the optical device is viewed under a cold environment.

[Means for solving the problem]

The object is to form a hollow cylinder, the space on the inner circumference of the space to secure the optical path between the eye of the observer and the eyepiece of the optical device, the air hole from the inner circumference to the outer circumference is formed. It is achieved by the eyepiece cover of the optical device, characterized in that.

Here, the air hole may be bent so that light from the outer circumferential side does not directly enter the inner circumferential side space in a process of passing from the inner circumferential side to the outer circumferential side. It is also preferable that the air holes are formed in plural.

EXAMPLE

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

First, a first embodiment of an eyepiece cover of an optical apparatus according to the present invention will be described with reference to FIG.

The optical device of this embodiment is a binocular having two optical systems, and the eyepiece cover of this embodiment is attached to the eyepiece of the binocular.

The binocular eyepiece of this embodiment supports the eyepiece 1, the cylindrical eyepiece eyetle 30 holding the eyepiece 1 on the inner circumferential side, and the eyepiece eyepiece 30 so as to be movable in the optical axis direction. And an eyepiece ring 20 for moving the eyepiece lens frame 30 and the eyepiece lens frame 30 together with the eyepiece 1 in the optical axis direction. In addition, the right side of FIG. 1, that is, the side on which the observer is located is called the observer side, and the left side of the same figure, that is, the side on which the observer is located is called the observer side.

The eyepiece outer frame 35 is attached to the main body casing 2 of the binoculars. A spiral female screw 36 is formed around the optical axis at the observer side end as the inner circumference of the eyepiece outer frame 35. The eyepiece inner frame 30 is provided on the inner circumferential side of the eyepiece outer frame 35. On the outer circumference of the eyepiece inner frame 30 and in the middle portion in the optical axis direction, a spiral male screw 31 is formed around the optical axis. The male thread 31 of the eyepiece inner frame 30 enters the female thread 36 of the eyepiece outer frame 35.

The eye ring 20 has a cylindrical shape, and a lens frame mounting portion 21 is formed on the observation side of the inner circumferential surface of the eyepiece lens 30 and substantially coincides with the outer diameter of the eyepiece lens frame 30. The operation part 22 which substantially matches the outer diameter of 35 is provided. The inner ring of the eyeglass ring mounting portion 21 is in contact with the outer circumferential surface of the observer side end of the eyepiece lens frame 30, the inner circumferential surface of the operation unit 22 is slightly relative to the outer circumferential surface of the eyepiece lens frame 35 It is installed to be spaced. The set screw 40 is pinched from the mounting portion 21 to the observer side end of the eyepiece lens frame 30 by the mounting portion 21. By the set screw 40, the dioptric ring 20 is fixed to the eyepiece lens frame 30 in a non-rotable manner around the optical axis and immovably in the optical axis direction. For this reason, when the light conduction 20 is rotated around the optical axis, the eyepiece lens frame 30 is also rotated around the optical axis in accordance with this rotation. As described above, a spiral male screw 31 is formed around the optical axis on the outer circumferential side of the eyepiece inner frame 30, and the male screw (in the inner circumference of the eyepiece outer frame 35 mounted on the main body casing 2). The female screw 36 with 31) is formed. Therefore, when the eye ring 20 is rotated around the optical axis, the eyepiece eye frame 30 on which the eye ring 20 itself is fixed as well as the eye ring 20 is fixed, and the eyepiece 1 held on the inner circumferential side thereof. Rotates around the optical axis and moves in the optical axis direction. The eye ring 20 is provided with an eyepiece cover attaching recess 23 for attaching the eyepiece cover described later. The eyepiece cover attaching recess 23 is recessed in a direction close to the optical axis C along the outer periphery of the lens frame attaching portion 21 of the dioptric ring 20.

The eyepiece cover 10 is formed of a hollow cylinder shape made of rubber. The inner circumferential side space S of the eyepiece cover 10 is a space for securing an optical path between the observer's eye and the eyepiece. On the object-side end of the eyepiece cover 10, an engaging convex portion 13 protrudes in a direction close to the optical axis C along its inner circumference and is inserted into the eyepiece cover mounting recess 23 of the eyepiece. It is. An inner diameter of the engaging convex portion 13 is narrowed on the observer side, and a disk portion 14 is formed in contact with the observer side end face of the ring ring 20. On the observer side of the disc portion 14, a trunk portion 15 is formed in which the difference between the inner diameter and the outer diameter, that is, the thick one, is constant in the optical axis direction. On the observer side of the trunk portion 15, a lip portion 16 protrudes slightly in the direction close to the optical axis C, and comes into contact with the observer's eye circumference at the time of observation. The eyepiece cover 10 is provided with an air hole 11 which communicates with the outer circumferential side in the inner circumferential side space. The outer circumferential side inlet 110 of the air hole 11 is formed in a place where the engaging convex portion 13 is formed at the end of the eyepiece cover 10 at the end side of the object to be observed and is thicker than other portions. In addition, the inner circumferential side inlet 111 of the air hole 11 is formed in the disc portion 14. The air hole 11 extends from the outer circumferential side inlet 110 once in a direction close to the optical axis C, bends at a right angle, and extends in a direction parallel to the optical axis C to reach the inner circumferential side inlet 111. In other words, the air hole 11 has an L-shaped cross-sectional shape.

When the air hole 11 is installed in the eyepiece cover 10 as described above, even when the binoculars are viewed under a cold environment, outside air flows into the inner peripheral space S of the eyepiece cover 10 via the air hole 11. Therefore, a temperature difference hardly occurs between the eyepiece 1, which has become cold, and the air in the inner circumferential side space S. FIG. Therefore, condensation of moisture in the air in the inner circumferential side space S on the eyepiece 1 can be prevented. In particular, in this embodiment, since the inner circumferential side inlet 111 of the air hole 11 is formed near the surface of the eyepiece 1, the effect is large.

In the present embodiment, since the eyepiece cover 10 is mounted on the eye ring 20 which rotates around the optical axis, the eyepiece cover 10 also rotates around the optical axis together with the eye ring 20. For this reason, when used in an environment where a strong light source such as the sun exists, the light from the sun enters the air hole 11 due to the positional relationship between the sun and the outer circumferential inlet 110 of the air hole 11. I can think of it. However, in this embodiment, since the shape of the air hole 11 is L-shaped, even if light from the sun enters from the outer circumferential side inlet 110 of the air hole 11, the inner circumferential side inlet 111 is as it is. Can be sufficiently shielded without reaching the inner circumferential side space (S).

Next, the eyepiece covers of the second and third embodiments according to the present embodiment will be described with reference to FIGS. 2 to 4. Also, the eyepiece cover of the second embodiment is shown in FIG. 2 and the eyepiece cover of the third embodiment is shown in FIGS. 3 and 4.

In binoculars, there is a focus control method called center focus. The center focus is to rotate the knob (focus knob) located between the two optics to focus the two optics at once. In this center-focused binocular, a trial ring is provided in one optical system and a trial ring is provided in the other optical system in order to adjust the deviation of the two optical systems focusing due to the difference in vision between the left and right eyes of the observer. Thus, an embodiment of the eyepiece cover attached to the eyepiece which is not provided with the trial ring will be described.

The eyepiece covers 10a, 10b of the second and third embodiments are mounted directly to the eyepiece frame 30a, which is basically not rotated about the optical axis with respect to the body casing 2. The eyepiece cover 10a, 10b of the present embodiment has the same L-shaped air hole 11 as that of the first embodiment in the upper part when the binoculars have their optical axis C substantially horizontal to the ground. And straight air holes 11a and 11b having a straight cross-sectional shape are formed in a portion that becomes the lower side. In addition, as shown in FIG. 2, the straight air hole 11a of the second embodiment has a through direction inclined with respect to the optical axis C, and the straight air hole 11b of the third embodiment As shown in FIG. 3, the penetrating direction is a direction perpendicular to the optical axis C. As shown in FIG.

In general, during the use of binoculars, a strong light source such as the sun is positioned above or beveled upward of the binoculars, and is rarely located below the binoculars. Therefore, when the eyepiece is not provided in the eyepiece and the eyepiece covers 10a and 10b are not rotated around the optical axis together with the eyepiece, even when the air holes 11a and 11b in the cross-sectional shape are linear, If the air holes 11a and 11b are formed in the position which becomes a lower side, the light from a light source can be prevented from invading into the inner peripheral space S.

In addition, as shown in FIG. 4, a plurality of air holes 11 and 11b are formed in order to allow the air traffic between the inner peripheral space S and the outer peripheral space of the eyepiece cover 10b to be naturally executed. It is preferable to form another air hole 11 at positions opposite to the optical axis C with respect to the two air holes 11b. Thus, in the present embodiment, straight air holes 11a and 11b are formed at the lower side of the eyepiece covers 10a and 10b, while they are 180 ° about the optical axis C with respect to the straight air holes 11a and 11b. The air hole 11 formed at the position of the eyepiece cover 10a, 10b is an L-shape so that light from the sun does not directly enter the inner circumferential side space S of the eyepiece cover 10a, 10b. It is an air hole 11.

In the case of such eyepiece covers 10a and 10b, a mark indicating the up and down directions of the eyepiece covers 10a and 10b is attached or the optical axis is attached to the eyepiece so as not to be misaligned when mounted to the eyepiece. In order to limit the mounting position in the circumferential direction, it is preferable to provide grooves or projections in the attaching portion of the eyepiece and the attaching portion of the eyepiece covers 10a and 10b mounted to the attaching portion of the eyepiece.

In addition, some eyepiece covers are mounted directly on the eyepiece frame which is not rotated around the optical axis. Such eyepiece covers are not rotated around the optical axis with respect to the eyepiece with or without a ring, so in this case, they are ideal as air holes. The straight air holes 11a and 11b described above can be employed.

5 is a front view of the binoculars when the eyepiece cover that is the above embodiment is attached. The binoculars are the above-described center focus type binoculars, and the ophthalmic ring is attached to the right eyepiece in the drawing, and the ocular ring is not attached to the eyepiece on the left.

Here, the eyepiece cover 10 of the first embodiment (wherein, a large number of air holes 11 are formed) is attached to the eyepiece portion (right eyepiece portion) to which the ophthalmic ring is attached, and the ophthalmic ring is not provided. The eyepiece cover 10a of the second embodiment is attached to the eyepiece (eyepiece on the left side).

In addition, although different eyepiece covers 10 and 10a are attached to the left and right eyepieces here, the eyepiece of the first embodiment in which the L-shaped air hole 11 is formed specifically with the same eyepiece cover 10, respectively. The cover 10 may be attached to the left and right eyepieces.

However, all of the eyepiece covers in the above embodiments are circular in cross-sectional shape. However, in the present invention, if the cross-sectional shape is a hollow cylindrical shape, the cross-sectional shape may be an ellipse or a polygon depending on the design state or the like.

The eyepiece covers in the above embodiments are all eyepiece covers attached to the eyepiece portion of the binoculars, but the present invention is not limited thereto, for example, of other optical instruments such as an entire telescope, a fieldscope, or a camera. It goes without saying that the present invention may be applied to the eyepiece cover. In addition, the entire telescope is mainly used at night, and since there is no strong light source such as the sun at the time of use, the shape of the air hole is sufficient even the simplest straight shape.

According to the present embodiment, if the eyepiece is provided in the eyepiece cover, the eyepiece and the inner circumference of the eyepiece become cold because the outside air flows through the airhole into the inner circumferential space of the eyepiece cover even when viewing the optical device under a cold environment. The temperature difference hardly occurs between the air and the space. Therefore, moisture in the air in the inner circumferential space can be prevented from condensing on the eyepiece, and as a result, the eyepiece can be prevented from clouding /

In the case where the air hole is bent, since the light from the outer circumferential side of the eyepiece cover does not enter the inner circumferential space of the eyepiece cover directly through the air hole, the object to be observed is not difficult to see. In the case where a plurality of air holes are formed, a hole for guiding the outside air into the inner circumferential side space of the eyepiece lens cover and a hole for sending air in the inner circumferential side space to the outer circumferential side are secured so that the outside air can be efficiently stored in the inner circumferential side space. It can lift and more surely prevents blur of the eyepiece.

[Effects of the Invention]

In the present invention, since the air hole is provided in the eyepiece cover, the outside air is easily introduced into the inner circumferential side space of the eyepiece cover, and the eyepiece is hardly blurred even when the optical device is viewed under cold environment.

Claims (3)

An eyepiece cover of an optical device mounted on the eyepiece of the optical device, wherein the eyepiece cover of the optical device has a hollow cylindrical shape and an air hole is formed from the inner circumferential side to the outer circumferential side thereof. The inner cylindrical space of the hollow cylindrical shape has a space for securing an optical path between the observer's eye and the eyepiece portion, wherein the air hole is in the process of passing from the inner circumferential side to the outer circumferential side. The eyepiece cover of an optical device, wherein the light from the outer peripheral side is bent so as not to directly enter the inner peripheral space. The eyepiece cover of an optical device according to claim 1 or 2, wherein a plurality of air holes are formed.