JP2003098572A - Eyecup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eyecup device which is constituted of first and second cylindrical members that are freely slidably engaged each other, whose assembly can easily be performed and whose assembly is prevented from easily coming out after the assembly of the first and second cylindrical members is once completed. SOLUTION: A movable piece 26 which can elastically be deformed is integrally formed in the peripheral wall of the first cylindrical member 20 by removing a part of the material of the wall. A projecting part 28 is formed outside the movable piece. A guide groove 28' extending from the rear end edge of the second cylindrical member to the front end edge along the center axis of the inner wall face of the second cylindrical member 22 is formed on the inner wall face of the second cylindrical member 22. The guide groove freely slidably receives the projecting part. When the projecting part abuts on the trailing end of the guide groove, the movable piece receives force with which it is elastically deformed to the outside of the radius direction of the first cylindrical member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyepiece device applied to an eyepiece such as an optical instrument for observation such as binoculars, monoculars, finder optical system of a video camera.

[0002]

2. Description of the Related Art As is well known, an eyepiece device sets an eye relief between an eyepiece and an eyepoint of an observation optical instrument as described above and prevents light from entering from the surroundings. It is used for the purpose of making the observation image easy to see. Such an eyepiece device includes a first tubular member that can be appropriately fixed to the lens barrel side of the eyepiece lens of the observation optical device, and is slidable along the central axis of the first tubular member. A second tubular member fitted together,
The tubular member is movable between a storage position in which it is pushed into the first tubular member and a projecting position in which it is pulled out from the first tubular member.

Such an eye contact device is used as needed. That is, when the eye contact device is used, the second tubular member is pulled out from the first tubular member and set to the projecting position. At this time, when the eyepiece is seen through the second tubular member, the eye point is changed. The eyepiece lens is placed at a predetermined eye distance. On the other hand, when the eye contact device is not used, the second tubular member is placed in the storage position pushed into the first tubular member, and at this time, the eye distance is arbitrarily set by the observer. The eyepiece device is not normally used when looking through the eyepiece while wearing glasses, and in this case, the second tubular member is placed in the storage position.

As described above, in the eye contact device, the second tubular member is movable with respect to the first tubular member between the storage position and the projecting position. When pulling out the second tubular member from the first tubular member, a stop mechanism is incorporated in both of the tubular members so as to hold the second tubular member in its protruding position. For example, a contact portion adapted to contact each other is formed on both the tubular members, and the second tubular member is the first.
When the second tubular member is pulled out from the tubular member to the projecting position, the two contact portions are engaged with each other, and thus the second tubular member is pulled out of the first tubular member beyond the projecting position. Is prevented.

[0005]

By the way, in the manufacture of the eye contact device as described above, the first and second tubular members are formed as independent parts, and then fitted to each other slidably. Is assembled. At the time of such assembling, since both abutting portions of the stop mechanism are in the position of interfering with each other, it is necessary to devise, for example, the assembling of the first and second tubular members. It is desirable to prevent the assembly from easily coming off after the assembly of the first and second tubular members is once completed. For example,
Due to the engagement of both abutting portions of the stop mechanism, when the second tubular member is placed in the projecting position with respect to the first tubular member, a large force is inadvertently applied to the second tubular member. It is necessary to avoid a situation in which the second tubular member is disengaged from the first tubular member due to the disengagement of both abutting portions when the pressure is applied. Generally, when the stop mechanism is designed so that the first and second tubular members can be easily assembled, both engaging portions of the stop mechanism tend to be easily disengaged.

Therefore, an object of the present invention is to provide a first tubular member which can be appropriately fixed to the lens barrel side of an eyepiece lens of an observing optical device, and to the first tubular member along the central axis thereof. And a second tubular member slidably fitted together,
A targeting device in which a second tubular member is movable between a storage position in which it is pushed in with respect to the first tubular member and a projecting position in which it is pulled out from the first tubular member, First
And an eyepiece device configured such that the assembling of the second tubular member can be easily carried out and the assembling of the first and second tubular members cannot be easily removed after the assembling is completed. That is.

In order to smoothly perform the sliding movement of the second tubular member with respect to the first tubular member, there is a certain degree between the first and second tubular members when they are fitted. It is necessary to provide a clearance, and the presence of such a clearance results in what is called play in the second tubular member.

Therefore, another object of the present invention is an eyepiece device constructed as described above, further comprising a first tubular member for the first tubular member without causing so-called rattling of the second tubular member. An object of the present invention is to provide an eye contact device capable of smoothly performing the sliding movement of the second tubular member.

[0009]

The eye contact device according to the present invention is applied to an eyepiece of an observing optical apparatus, and can be appropriately fixed to the lens barrel side of the eyepiece.
And a second tubular member slidably fitted to the outside of the first tubular member along the central axis thereof. The second tubular member is movable between a storage position pushed into the first tubular member and a protruding position pulled out from the first tubular member. An elastically deformable movable piece is integrally formed in the peripheral wall of the first tubular member by removing a part of the material,
A protrusion is formed on the outside of the movable piece. A guide groove is formed on the inner wall surface of the second tubular member so as to extend from the rear end edge of the second tubular member toward the front end edge thereof along the central axis of the second tubular member. Are slidably received. When the second tubular member is pulled out from the first tubular member to the projecting position, the end of the guide groove abuts against the protrusion, whereby the second tubular member from the first tubular member is contacted. The tubular member is prevented from falling off. It is characterized in that the movable piece receives a force such that the movable piece is elastically deformed outward in the radial direction of the first tubular member when the protrusion is brought into contact with the terminal end of the guide groove.

In a preferred embodiment, the first tubular member has a plurality of movable pieces arranged at equal intervals along the circumferential direction thereof, while the second tubular member has guide grooves. The movable pieces are arranged at equal intervals along the circumferential direction of the movable pieces.

In the eye contact device according to the present invention, the outer wall surface of the first tubular member may be formed with a ridge projection extending along the central axis thereof, and in this case, the second tubular member of the second tubular member is formed. A concave groove portion extending from the outer edge of the second tubular member toward the inner edge of the second tubular member is formed on the inner wall surface so as to slidably receive the convex projection. Preferably,
A plurality of convex projections is formed on the outer wall surface of the first tubular member, and a plurality of concave groove portions are formed on the inner wall surface of the second cylindrical member, the number corresponding to the number of the projection projections. .

Further, in the eye contact device according to the present invention, the second
The inner wall surface of the cylindrical member may be formed with a protruding projection extending along the central axis thereof. In this case, the outer wall of the first cylindrical member may receive the protruding projection. A groove portion is formed which extends from the outer edge of the first tubular member toward the inner edge thereof. Preferably, a plurality of ridge protrusions are formed on the inner wall surface of the second tubular member,
The outer wall surface of the cylindrical member is formed with a number of recessed groove portions corresponding to the number of protruding protrusions.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of an eye contact device according to the present invention will be described with reference to the accompanying drawings.

Referring to FIG. 1, binoculars equipped with the eyepiece device according to the present invention are indicated generally by the reference numeral 10. In the present specification, the objective side and the eyepiece side of the binoculars 10 are defined as the front side and the rear side, respectively, and in FIG. 1, the front side and the rear side of the binoculars 10 are indicated by reference numerals 12F and 12R, respectively.

The binoculars 10 comprises a main body 10A and a pair of eyepieces 10B, and the pair of eyepieces 10B is the main body 10A.
It is arranged on both sides behind A. A pair of objective optical systems (not shown) are built in the main body portion 10A on the left and right sides, and each objective optical system includes an objective lens, a prism, etc., and the pair of eyepieces is arranged on the front end surface of the main body portion 10A. Is located in.

On the other hand, an opening bore 14 is formed in each eyepiece portion 10B, and an eyepiece lens barrel 16 having an eyepiece lens system therein is inserted and fixed in the opening bore 14. The eyepiece lens barrel 16 has a built-in eyepiece lens system, and the left and right eyepiece lens systems are made to optically cooperate with the left and right objective optical systems in the main body 10A, respectively.

In order to fix the eyepiece lens barrel 16 in the opening bore 14, an inner flange 17 is formed in a recessed portion of the opening bore 14, and an inner peripheral wall of the opening bore 14 is adjacent to the inner flange 17. Female thread 18 on the rear side
Is cut. On the other hand, an outer flange 19 is provided on the front end edge of the eyepiece lens barrel 16, and the outer diameter of the outer flange 19 is somewhat smaller than the inner diameter of the opening bore 14, but the inner flange 17 inside the opening bore 14 is small. Larger than the inner diameter of. That is, when the eyepiece lens barrel 16 is inserted into the opening bore 14, the outer flange 19 contacts the inner flange 17 in the opening bore 14. The fixation of the eyepiece lens barrel 16 in the opening bore 14 will be described later.

A roller 10C is rotatably disposed in the main body 10A at an intermediate position between the left and right sides and between a pair of eyepieces 10B, and a support plate (not shown) for supporting the roller 10C and a pair of objective lens systems. ) And a cam mechanism (not shown), for example. During observation with the binoculars 10, the wheel 10C is rotated by, for example, the index finger, which moves the support plate in the front-rear direction, thus adjusting the distance between the pair of objective lens systems and the pair of eyepiece lens systems. The observation image is focused.

A pair of eye contact devices according to the present invention are prepared,
Each eyepiece device is applied to the eyepieces of the individual eyepiece lens barrel 16. As shown in FIG. 1, each eye contact device includes a first tubular member 20, a second tubular member 22, and an eye contact ring 24. First and second tubular members 20 and 2
2 is individually formed as an integrally molded product from a suitable synthetic resin material, and the eyepiece ring 24 is formed from a suitable rubber material.

On the front side of the first tubular member 20, a male screw portion 21 is cut on the outer peripheral wall surface thereof, and the first tubular member 20 has the male screw portion 21 to open the bore 1 of the corresponding eyepiece portion 10B.
It is adapted to be screwed into the female threaded portion 18 in 4. That is, as is apparent from FIG. 1, the inner diameter of the first tubular member 20 is larger than the outer diameter of the eyepiece lens barrel 16 and smaller than the inner diameter of the opening bore 14. Thus, with the eyepiece lens barrel 16 inserted in the opening bore 14 and the outer flange 19 thereof abutting the inner flange 17 in the opening bore 14, the male threaded portion 21 of the first tubular member 20 is threaded onto the female threaded portion. 1
The first tubular member 20 is fixed together with the eyepiece lens barrel 16 in the opening bore 14 by being screwed in.

In the present embodiment, as best shown in FIG. 2, in the peripheral wall of the first tubular member 20, the elastically deformable first movable piece 26 is one of the materials of the peripheral wall. It is integrally formed by excluding parts. That is, a substantially U-shaped slot is formed on the peripheral wall of the first tubular member 20, and the first movable piece 26 is supported in the inner region of the substantially U-shaped slot, that is, in the form of a cantilever. Area. As shown in FIG. 2, the first movable pieces 26 are arranged in a pair in the diametrical direction of the first tubular member 20. If necessary, three or four first movable pieces 26 may be formed. In that case, the first movable piece 26 is preferably the first movable piece 26.
Are arranged at equal intervals along the circumference of the tubular member 20.

The free end of the first movable piece 26 is on the front side of the first tubular member 20, and its supporting end is the first tubular member 2.
It is the rear side of 0. The arrangement of the first movable piece 26 is an important feature of the present invention, and the reason for this will be described in detail later.

A protrusion 28 is formed on the outer surface of the first movable piece 26.
Are integrally formed, and in the present embodiment, the protrusion 28 has a circular cross section. The front half of the top of the circular protrusion 28 is formed as a semicircular flat surface 28A, and the rear half thereof is formed as a semicircular inclined surface 28B. As is apparent from FIG. 2, the semicircular inclined surface 28B is formed on the first tubular member 20.
Is inclined so as to gradually decrease toward the rear end surface of the first tubular member 20, and is connected to the outer wall surface of the first tubular member 20.

Further, the outer wall surface of the first tubular member 20 is integrally formed with two pairs of protrusion projections 30 and 32 extending along the central axis thereof, and preferably, each pair of protrusion projections. The parts (30, 32) are arranged in the diametrical direction of the first tubular member 20. In the present embodiment, the width of the one pair of protruding protrusions 30 is made wider than the width of the other pair of protruding protrusions 32, but the widths of both protruding protrusions 30 and 32 are equal. Alternatively, the width of the protruding projection 30 may be narrower than the width of the protruding projection 32.

Further, a second movable piece 34 which is elastically deformable is formed on the peripheral wall of the first tubular member 20 on the rear end side thereof, and the second movable piece 34 is the first tubular member. It is integrally formed by forming a pair of slots from the rear edge of 20. Therefore, the second movable piece 34 is supported in the form of a cantilever on the front edge side of the first tubular member 20. . First
As with the movable piece 26 of FIG.
A pair of cylindrical members 20 are arranged in the diametrical direction. As shown in FIG. 2, a protrusion 36 having a semicircular cross section is integrally formed on the outer surface of the second movable piece 34, and the semicircular protrusion 36 having a cross section has a first longitudinal axis. The tubular member 20 is arranged along the circumferential direction.

On the other hand, the inner diameter of the second tubular member 22 is somewhat larger than the outer diameter of the first tubular member 20, so that the outside of the first tubular member 20 is along the central axis thereof. The second tubular member 22 is slidably fitted. For such fitting, first, the second tubular member 2
A pair of guide grooves 28 'for slidably receiving the circular protrusion 28 of the first movable piece 26 on the side of the first tubular member 20 is formed on the inner wall surface of the second guide member 28'. The second tubular member 22 extends from the rear edge thereof toward the front edge thereof. The end of each guide groove 28 'is the second tubular member 2
It is located a predetermined distance from the front edge of 2, and is semi-circular so as to fit snugly on the circular protrusion 28.

Further, the first and second tubular members 20 and 2
In order to slidably receive the two pairs of protruding projections 30 and 32 on the first tubular member 20 side when the two are fitted together,
On the inner wall surface of the second tubular member 22, two pairs of concave groove portions 3 are provided.
0'and 32 'are formed through the inner wall surface along their central axis. Of course, as is apparent from FIG. 2, the pair of concave groove portions 30 ′ are for slidably receiving the pair of convex protrusion portions 30 on the first tubular member 20 side, and the pair of concave groove portions 30 ′. The groove member 32 'is the first tubular member 2
This is for slidably receiving the pair of protrusion projections 32 on the 0 side.

Further, the first and second tubular members 20 and 2
When the two are fitted, the second movable piece 34 on the first tubular member 20 side
A guide groove 36 ′ on the inner wall surface of the second tubular member 22 for slidably receiving the semi-circular protrusion 36 of the cross section of the second tubular member 22.
Are formed so as to extend from the front end edge of the second tubular member 22 toward the rear end edge side thereof. Each guide groove 36 '
Is located at a predetermined position approximately in the middle between the front end edge and the rear end edge of the second tubular member 22, and the rear end edge of the second tubular member 22 and the end of each guide groove 36 '. Two openings 36 ₁ and 36 ₂ are formed between the openings 36 ₁ and 36 ₂ so as to be aligned with the guide groove 36 ′, and a cross section of the second movable piece 34 is formed in each opening (36 ₁ , 36 ₂ ). It is sized and shaped to receive the semi-circular protrusion 36.

In the present embodiment, the rear edge side portion of the second tubular member 22 is formed as an annular thick portion 22A, and the openings 36 ₁ and 36 ₂ are formed in the annular thick portion 22A. Also, the annular thick portion 22A has an eyepiece ring 24 (FIG. 1).
It is also used as a mounting point for.

In order to fit the second tubular member 22 on the outer side of the first tubular member 20, first, the first and second tubular members 20 and 22 are positioned as shown in FIG. When the rear end side of the first tubular member 20 is inserted into the front end edge of the second tubular member 22, the circular protrusions 28 of the first movable piece 26 are moved. The semicircular inclined surface 28B is brought into contact with the front end edge of the second tubular member 22. At this time, the first tubular member 20 is replaced by the second tubular member 22.
When pushed in with a force equal to or greater than a predetermined pushing force, the semicircular inclined surface 28B of each circular protrusion 28 and the second tubular member 2
The first movable piece 2 for abutting engagement with the front edge of
6 is elastically deformed radially inward, so that each circular projection 28 can pass between the front edge of the second tubular member 22 and the end of its corresponding guide groove 28 ', thus Each circular protrusion 28 has its corresponding guide groove 2.
8'will be accepted.

The first tubular member 20 is replaced by the second tubular member 22.
When it is pushed further inward, the semi-circular projection portion 36 of the second movable piece 34 on the side of the first tubular member 20 has a semicircular cross section and is guided by the guide groove 3.
It is brought into contact with the end of 6 '. At this time, when the first tubular member 20 is pushed into the second tubular member 22 with a force equal to or greater than a predetermined pushing force, the semicircular protrusion 36 of the cross section has a semicircular shape, so that the guide groove 36 'is formed. The second movable piece 34 is elastically deformed inward in the radial direction and is engaged in the opening 36 ₁ as it goes over the end of the.

The first tubular member 20 is replaced by the second tubular member 22.
If it is pushed in with a force more than a predetermined pushing force,
The semi-circular protrusion 36 having a transverse cross section is pulled out from the opening 36 _1, and the second movable piece 34 is elastically deformed inward in the radial direction to be engaged in the opening 36 ₂ . At this time, the front edge of the annular thick portion 22A of the second tubular member 22 is brought into contact with the rear edge of the male screw portion 21 of the second tubular member 22,
Further pushing of the first tubular member 20 into the tubular member 22 is prevented.

The first and second tubular members 20 and 22 assembled in this manner are used as eye contact devices in female screw portions 16 in the opening bores 14 of each eyepiece portion 10B of the binoculars 10 as shown in FIG. Screwed on. As shown in FIG.
In this embodiment, each eyepiece portion 10B of the binoculars 10 is configured as a synthetic resin portion 10B ₁ coated with a rubber material 10B ₂ , and the same can be said for the main body portion 10A of the binoculars 10. Regarding the eyepiece ring 24 formed of a suitable rubber material, the annular shape of the second tubular member 22 may be before or after the assembling (fitting) of the first and second tubular members 20 and 22. It is attached to the thick member 22A.

In FIG. 3, the second tubular member 22 is shown in the retracted position in which it is accommodated in the first tubular member 20. At this time, the eye contact device itself is in a non-use state, for example, an eyepiece lens mirror. The eyepiece of the tube 16 is viewed by a person wearing glasses. The second tubular member 22 is the first tubular member 2
When placed in the storage position with respect to 0, the semi-circular protrusion 36 of the second movable piece 34 on the first tubular member 20 side in cross section
Is in a so-called click-stop engagement state with respect to the opening 36 ₂ on the side of the second tubular member 22, so that unless a force equal to or more than a predetermined drawing force is exerted on the second tubular member 22, The tubular member 22 is not pulled out from the first tubular member 20, but is retained in the storage position as shown in FIG.

On the other hand, when a person who does not wear eyeglasses looks into the eyepiece, in order to set the eye distance between the eyepoint of the person and the eyepiece, a force of a predetermined pull-out force or more is applied to the second tubular member 22. Is disengaged, the click-stopping engagement of the semi-circular protrusion 36 of the cross section with respect to the opening 36 ₂ is released, whereby the second tubular member 22 is released from the first tubular member 2.
Drawn from 0. Then, the semi-circular protrusion 36 in cross section
Is click-stoppedly engaged with the opening 36 ₁ on the second tubular member 22 side, and at this time, the first eye distance with respect to the eyepiece lens is set.

When a force more than a predetermined drawing force is further exerted on the second tubular member 22, the click stop engagement of the semi-circular protrusion 36 of the cross section with respect to the opening 36 ₁ is released, whereby the second tubular member 22 is released. The tubular member 22 is further pulled out from the first tubular member 20. Thereafter, the semi-circular protrusion 36 having a cross section is click-engaged with the end of the guide groove 36 'on the side of the second tubular member 22, and at this time, the second portion with respect to the eyepiece lens.
The eye distance of is set.

On the other hand, when the second eye distance is set, the second tubular member 22 is pulled out from the first tubular member 20 to the projecting position as shown in FIG. The circular protrusion 28 of the first movable piece 26 on the side of the tubular member 20 is brought into abutting engagement with the terminal end of the guide groove 28 'on the side of the second tubular member 22, so that Of the second tubular member 22 is prevented.

It should be noted here that when the second tubular member 22 receives a force so as to be pulled out from the first tubular member 20 beyond the protruding position of FIG. 4, the first movable piece is moved. 26
Is to be elastically deformed outward in the radial direction. That is, the elastic deformation of the first movable piece 26 is performed in such a direction as to ensure the abutting engagement between the circular protrusion 28 and the end of the guide groove 28 '. Of course, such an action can be obtained from the fact that the first movable piece 26 is supported in the form of a cantilever on the rear end edge side of the first tubular member 20, as described above. Is. In short, when the second tubular member 22 receives a force so as to be pulled out of the first tubular member 20 beyond the projecting position of FIG. 4, the circular protrusion 28 and the end of the guide groove 28 'come into contact with each other. The tangential engagement is positively maintained, so that the first and second
The tubular members 20 and 22 are not easily attached.

Contrary to the case described above, if the first movable piece 26 is supported on the front end edge side of the first tubular member 20 in a cantilever manner, the second tubular piece 20 is supported. Member 2
When the second movable member 26 is elastically deformed inward in the radial direction when the second movable member 26 receives a force to be pulled out from the first tubular member 20 beyond the protruding position, the circular protrusion 28 is formed. The guide groove 28 'is easily disengaged from the abutting engagement with the end of the guide groove 28', and as a result, the first and second tubular members 20 and 22 are easily disassembled.

Further, in order to smoothly perform the sliding movement of the second tubular member 22 with respect to the first tubular member 20, a space between the first and second tubular members 20 and 22 is provided. It is necessary to provide some clearance, and the presence of such clearance usually causes a so-called radial play in the second tubular member 22 relative to the first tubular member 20. However, in the above-described embodiment, the two pairs of protruding projections 30 and 32 on the first tubular member 20 side and the two pairs of recessed groove portions 30 'on the second tubular member 22 side are provided. And 32 'respectively, so-called radial play of the second tubular member with respect to the first tubular member 20 is eliminated.

More specifically, each protruding projection (30, 32)
Even if the tolerance of the width dimension of each groove groove portion (30 ', 32') with respect to the width dimension of the groove is relatively strictly regulated, the side surface of each protrusion projection (30, 32) and each groove groove portion (30 ' Three
Since the contact area with the side surface of 2 ') is extremely small, the smooth sliding movement of the second tubular member 22 with respect to the first tubular member 20 is not impeded, and therefore each convex protrusion Sides of the portion (30, 32) and each groove groove portion (30 ', 32')
The side surfaces of the second tubular member are engaged with each other in a state of being relatively closely contacted with each other, and as a result, radial so-called looseness of the second tubular member with respect to the first tubular member 20 can be effectively eliminated. become.

In the above-described embodiment, the ridge protrusions (30,
32) is provided on the first tubular member 20 side, and the groove groove (3
0 ', 32') are provided on the second tubular member 22 side, but if necessary, concave groove portions (30 ', 32') are provided on the first tubular member 20 side. The protruding projections (30, 32) may be provided on the side of the second tubular member 22.

4 ridge projections (30, 32) and 4
It is preferable to arrange the respective groove portions (30 ', 32') of the book at equal intervals along the circumferential direction of the first and second tubular members 20 and 22, but in the above-mentioned embodiment. The four convex stripe projections (30, 32) and the four concave stripe grooves (30 ', 32') are not arranged at equal intervals. This is because when the first and second tubular members 20 and 22 are integrally molded from a resin material and the molding die has a split structure, four ridge protrusions (30, 32) and This is because it is difficult to arrange the four concave groove portions (30 ′, 32 ′) at equal intervals. By forming the molding die into, for example, a four-split structure, the four protrusions (30, 3
2) and each of the four recessed groove portions (30 ', 32') can be arranged at equal intervals along the circumferential direction of the first and second tubular members 20 and 22. On the other hand, the convex protrusions (30, 32) and the concave groove portions (30 ', 3)
Each of 2 ') may be provided in an odd number, and in this case as well, the convex projections (30, 32) and the concave groove (3
0 ', 32') are preferably arranged at equal intervals.

[0044]

As is apparent from the above description, the eye contact device according to the present invention has the first component which is its constituent element.
In addition, not only the assembly of the second tubular member is easily performed, but also the second tubular member is not easily removed after the assembly is completed, so that the operational reliability of the eye contact device is greatly improved. To be Further, in the case where a ridge protrusion and a groove groove that engage with each other along the central axis are provided between the first and second tubular members, the second tubular member for the first tubular member is provided. It becomes possible to perform the sliding movement of the strip-shaped member without so-called backlash.

[Brief description of drawings]

FIG. 1 is a perspective view of binoculars equipped with a targeting device according to the present invention, and is a diagram showing a part of a part thereof as a part arrangement diagram.

FIG. 2 is a diagram showing, as an enlarged component arrangement diagram, first and second tubular members constituting the eye contact device according to the present invention, which are extracted from FIG.

FIG. 3 is a partial cross-sectional view showing a state in which the first and second tubular members shown in FIG. 2 are assembled with each other and screwed into an opening bore of an eyepiece portion of binoculars as an eye contact device, and an upper side thereof. It is the figure which combined what the cross section and the lower section were cut in different cross sections.

FIG. 4 is a partial cross-sectional view similar to FIG. 3, showing the second tubular member in a protruding position where it is pulled out from the first tubular member.

[Explanation of symbols]

10 Binoculars 10A Body part 10B Eyepiece part 10C Rolling wheel 14 Opening bore 16 Eyepiece lens barrel 20 First tubular member 22 Second tubular member 24 Eyepiece ring 26 First movable piece 28 Circular protrusions 30 and 32 convex protrusion 34 second movable piece 36 cross-section the semi-circular projections 28 'the guide groove 30', 32 'concave groove 36' Guide groove 36 _1, 36 ₂ opening

Claims (6)

[Claims] 1. An eyepiece device applied to an eyepiece lens of an observing optical apparatus, comprising: a first tubular member that can be appropriately fixed to a lens barrel side of the eyepiece lens; and a first tubular member. A second tubular member slidably fitted to the outside of the member along the central axis thereof, and the second tubular member is pushed into the first tubular member. In a sighting device movable between a storage position and a projecting position pulled out from the first tubular member, a part of the material is excluded in a peripheral wall of the first tubular member. As a result, an elastically deformable movable piece is integrally formed, a protrusion is formed on the outside of the movable piece, and an inner wall surface of the second tubular member is provided with a second protrusion along the central axis. A guide groove extending from the rear edge of the tubular member toward the front edge thereof is formed. The protrusion is slidably received in the groove, and when the second tubular member is pulled out from the first tubular member to the projecting position, the end of the guide groove is relative to the projecting portion. Abut,
As a result, the second tubular member is prevented from falling off the first tubular member, and when the protrusion is brought into contact with the end of the guide groove, the movable piece moves to the first tubular member. A targeting device which receives a force capable of being elastically deformed radially outward. 2. The eye contact device according to claim 1,
A plurality of the movable pieces are arranged on the first tubular member at equal intervals along the circumferential direction thereof, and the second tubular member has the guide grooves corresponding to the number of the movable pieces. A targeting device characterized by being arranged at equal intervals along the circumferential direction. 3. The eye contact device according to claim 1 or 2, wherein a protrusion projection extending along a central axis of the first tubular member is formed on an outer wall surface of the first tubular member, and the second tubular member is provided. A concave groove portion extending from an outer end edge of the second tubular member toward the inner end edge of the second tubular member is formed on the inner wall surface of the member to slidably receive the convex projection. Targeting device. 4. The eye contact device according to claim 3,
A plurality of the protrusion projections are formed on the outer wall surface of the first tubular member, and the groove grooves correspond to the number of the projection protrusions on the inner wall surface of the second tubular member. A targeting device characterized by being formed by the number of pieces. 5. The eye contact device according to claim 1, wherein the second tubular member has an inner wall surface formed with a ridge protrusion extending along a central axis of the second tubular member. The eye contact device, wherein a concave groove portion extending from an outer end edge of the first tubular member toward an inner end edge of the first tubular member is formed on an outer wall surface of the member so as to receive the convex projection. 6. The eye contact device according to claim 5,
A plurality of the protrusion projections are formed on the inner wall surface of the second tubular member, and the groove grooves correspond to the number of the protrusion projections on the outer wall surface of the first tubular member. A targeting device characterized by being formed by the number of pieces.