JPH0232310A - Focusing device for binoculars - Google Patents

Abstract

PURPOSE:To prevent an eyepiece from being shaken even if external force is applied, so that a stable and satisfactory observation image can be obtained by screwing and fixing each connecting member. CONSTITUTION:Blades 27, 28 are connected to right and left eyepiece cylinders 11, and in the blade, a connection use arm 33 is projected and formed, a connection use projection provided projectingly on the eyepiece cylinder 11 and its connection use arm 33 are placed so as to be superposed on each other, and by a fixing screw 36, the connection use arm 33 and the connection use projection 12 are screwed and fixed. Also, on the contact face of the connection use projection 12 and the connection use arm 33, a recessed groove 37 is formed, and on the connection use arm 33 side, a projecting part 38 which is engaged to the recessed groove 37 is formed. The engagement of the recessed groove 37 and the projecting part 38 works as a turn-stopper, therefore, the connection use projection 12 and the arm 33 cannot move relatively in the rotational direction of the fixing screw.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a focusing device for binoculars, and more particularly, to a focusing device for binoculars, and in particular, a focusing device provided between left and right eyepieces.
This invention relates to a focusing device for binoculars in which left and right eyepiece lenses are moved forward and backward at the same time to perform focusing.

[Prior Art] This type of focusing device for binoculars, as shown in FIG. 6, for example, has an eyepiece tube 52 connected to both ends of a pair of relatively rotatable left and right arms 51, generally called blades. A threaded rod 53 was provided protruding from the central connecting portion of the arm 51, and these constituted one eyepiece unit 50.

54 is an eyepiece lens.

A wheel 55 serving as a focus adjustment drive means is provided on the base shaft 59 of the binocular body 60, and a threaded rod 55 is attached to the wheel 55.
3 are screwed together and the rollers 55 are rotated to move the eyepiece tube 52 forward and backward in the optical axis direction via the left and right arms 51. In this way, the center part of the eyepiece unit 50 is supported on the binocular body 60 by the threaded rod 53, while the left and right receivers 56 annularly protruding from the binocular body 60 at the eyepiece position
Both ends of the eyepiece unit 50 were supported by fitting the base of the eyepiece tube 52 into the ends.

However, the distance between the base shaft 59 and the receiver 56 always varies from product to product. Therefore, if there is no degree of freedom in the distance B between the threaded rod 53 and the eyepiece tube 52, when the threaded rod 53 is screwed into the wheel 55, the base of the eyepiece tube 52 cannot be fitted into the receiver 56. First, there may be cases where the eyepiece unit 50 cannot be attached to the binocular main body 60.

Therefore, in the past, the left and right arms 51 were attached to the threaded rod 53 with some play, so that the distance B between them and the eyepiece tube 52 could be changed by the amount of play.

[Problems to be Solved by the Invention] However, if there is play in the arm 51 connecting the eyepiece tube 52, the eyepiece lens 54 may become loose when the eyepiece is touched during use.
This has the disadvantage that it is difficult to obtain a good observation image because the image is blurred.

It is an object of the present invention to provide a focusing device for binoculars that eliminates such conventional drawbacks and can stably obtain a good observation image without causing the eyepiece lens to shake even when an external force is applied. .

[Means for Solving the Problems] In order to achieve the object L, the focusing device for binoculars of the present invention includes a single focusing drive means disposed between left and right eyepiece tubes that support eyepiece lenses. In a focusing device for binoculars that performs focusing by simultaneously advancing and retracting in the optical axis direction, connecting members are provided laterally from both the focal point YA node driving means and the eyepiece tube so as to overlap with each other. The connecting members are fixed together with screws, and a rotation preventing means is provided to restrict the relative movement of the connecting members so that the connecting members do not move relative to each other in the direction of rotation of the screw. It is characterized by

Then, the connecting members are arranged one on top of the other, and a groove is formed in one of the connecting members along the protruding direction,
forming a convex portion on the other connecting member that engages with the concave groove;
A rotation preventing means may be formed by these grooves and the convex portions.

[Operation] Connecting members protruding from the focus adjustment driving means and the eyepiece tube so as to overlap with each other are fixed to each other by screws. When fixing with screws, there is enough leeway to fix it as is even if there is some misalignment. Therefore, even if there is some variation in the distance between the focus adjustment driving means and the eyepiece tube, the connection state of the connecting members can be shifted and screwed accordingly, and the connecting members can be connected and fixed without any play. can.

When the screws are tightened, the rotation preventing means restricts the relative movement of the connecting members, so the connecting members do not rotate following the tightening of the screws, but are kept in a predetermined direction and in a predetermined positional relationship. It is connected and fixed in a state where it is maintained.

[Example] Examples will be described with reference to the drawings.

FIG. 3 is a perspective view showing the entire binoculars. The binocular main body 1 is formed to be symmetrical as a whole with respect to a base axis 2 at the center, and includes an eyepiece lens 3, an objective lens 4, and a pair of Porro prisms 5 provided therebetween on each side. A Boro mirror may be arranged in place of the Porro prism 5, and the binocular body 1 can be rotated and bent about the base axis 2, and the distance between the eyepieces can be arbitrarily changed. In addition, a rolling wheel 6 provided on the base shaft 2 part
By rotating the left and right eyepieces 3, the left and right eyepieces 3 can be moved forward and backward at the same time in the optical axis direction to perform focusing. Also,
By rotating one eyepiece 22 (for example, the right side), only the inner eyepiece 3 can be moved forward or backward in the optical axis direction, thereby adjusting the diopter difference between the left and right sides.

FIG. 1 is a partial sectional view taken to include the main parts of the binoculars, and FIG. 2 is a front sectional view. A guide hole 9 is formed in the binocular body 1, centered around each of the left and right eyepiece optical axes 8, and reaching from the eyepiece side to the porro prism 5 housing portion in the binocular body 1. A thin annular wall 10 is provided protruding from the entrance portion of the guide hole 9.

Inside the guide hole 9 is an eyepiece tube 11 that supports the eyepiece lens 3.
is slidably inserted in the direction of the eyepiece optical axis 8. At the bottom of the eyepiece tube 11, a connecting protrusion 12 is provided to protrude laterally toward the base axis 2, and on the wall of the guide hole 9, an eyepiece light is provided at the portion where the connecting protrusion 12 protrudes. A slit 13 is formed parallel to the axis 8.

Furthermore, in order to prevent the bottom of the eyepiece tube 11 from colliding with the Porro prism 5, the eyepiece tube 11 is formed by cutting out a portion that will interfere with the Porro prism 5.

14 is the notch portion. As described above, in this embodiment, the fitting margin between the eyepiece tube 11 and the guide hole 9 is made sufficiently long inside the binocular body 1, and as a result, the portion that will interfere with the Porro prism 5 is removed from the eyepiece tube 11. It is partially cut out.

An eyepiece lens is fixed to one of the pair of left and right eyepiece tubes 11 (for example, the left side) so as not to move, while a diopter difference adjusting means 20 is provided on the other side (for example, the right side).

The diopter difference adjustment means 20 includes an eyepiece frame 21 to which the eyepiece 3 is attached and which slides against the eyepiece tube 11, an eyepiece 22 made of rubber, and the eyepiece 22 and the eyepiece frame 21.
It consists of fraction 23 that connects 24 is a screw that fixes the fraction 23 to the eyepiece frame 21, and the eyepiece 22 is attached to the outer surface of the fraction 23 so as to rotate together with the eyepiece 23. Therefore, by turning the right eyepiece 22, the eyepiece frame 21 to which the right eyepiece 3 is attached moves forward and backward in the direction of the eyepiece optical axis 8 while rotating, thereby adjusting the diopter difference between the left and right sides.

Note that the dioptric difference adjustment means 20 is also provided with a rotation stopper and the like, but illustration thereof is omitted.

The base axis 2 is arranged parallel to the eyepiece optical axis 8, and a wheel 6 is rotatably provided there. Then, when the wheel 6 is rotated, the lifting shaft 26 that is threadedly engaged with the wheel 6 slides in the axial direction, and the wheel 6 and the lifting shaft 26 form a pair to form a focal point Wfr.
It constitutes an i-driving means. Note that a micro motor or the like may be used instead of the wheel 6.

Wings 27 and 28, which are connecting members connected to the left and right eyepiece tubes 11, are fitted to the elevating shaft 26 so as to be relatively rotatable. Therefore, if the binocular body 1 is bent around the base axis 2, the blades 27 and 28 will follow the movement.
rotates. To explain more specifically, the right wing 2
8 rotates freely with respect to the lifting shaft 26, and the left wing 27
is engaged with the lifting shaft 26, and plays the role of regulating the rotation of the lifting shaft 26. Reference numeral 29 denotes an engaging portion thereof, which is composed of a concave portion and a convex portion that engage with each other. Lifting axis 2
A flange portion 26a is provided protruding from one end side of 6,
A nut 3 screwed into the flange portion 26a and the lifting shaft 26
0, left and right blades 27 and 28 are arranged with a washer 31 in between. 32 is a machine screw for preventing the nut 30 from loosening.

The vanes 27, 28 are connected to the left and right eyepiece tubes 11. The connecting portion will be described below with reference to FIG. 4, which shows an exploded perspective view of the right side portion.

A connecting arm 33 is formed on the right wing 28 to protrude laterally toward the right eyepiece tube 11, and the connecting protrusion 12 protruding from the eyepiece tube 11 and the connecting arm 33 are connected to the optical axis. They are arranged so as to overlap each other in the direction. The connecting arm 33 has a female screw hole 34, and the connecting protrusion 12 has a hole 3 with an inner diameter thicker (for example, 0.3 mm thicker) than the screw hole 34.
5 is drilled. Then, the connecting arm 3
3 and the connecting protrusion 12 are fixed with screws.

The distance between the base axis 2 and the eyepiece optical axis 8 varies from product to product. However, in this embodiment, the connecting protrusion 1
Even if the positional relationship between 2 and the arm 33 is shifted, the fixing screw 3
If it is within the range of the play provided between 6 and hole 35,
The connection can be fixed by tightening the fixing screw 36.

Therefore, variations in the distance between the base axis 2 and the eyepiece optical axis 8 are absorbed there. After tightening the fixing screw 36, this connecting portion is fixedly connected without any play.

Further, as shown in FIG. 5, which is a cross-sectional view taken along the line V-V, the contact surface between the connecting protrusion 12 and the connecting arm 33 has a line extending along the protruding direction on the connecting protrusion 12 side. A concave groove 37 having a V-shaped cross section is formed, and a convex portion 38 that engages with the concave @37 is formed on the connecting arm 33 side.

Therefore, the connecting protrusion 12 and the connecting arm 33 are relatively movable in the direction along the groove 37, that is, in the direction connecting the base shaft 2 and the eyepiece optical axis 8. As soon as the concave groove 37 and the protrusion 3 are connected and fixed by screwing at that position,
Since the engagement with 8 rotates (acts as a toe), the connecting protrusion 12 and the arm 33 cannot move relative to each other in the direction of rotation of the fixing screw 36. Therefore, when tightening the fixing screw 36, In this case, the connecting protrusion 12 and the arm 33 do not rotate following the rotation of the fixing screw 36, but maintain a straight connected state.Therefore, the connecting protrusion 12 and the arm 33 are bent and connected. They are connected and fixed in a predetermined direction and in a predetermined positional relationship, and are not pressed strongly against the wall surface of the slit 13, and operate smoothly during focusing operations.

In the above-mentioned embodiment configured in this way, when the wheel 6 is rotated, the elevating shaft 26 slides in the axial direction, and the blades 27 and 28 slide together with the elevating shaft 26. Then, the eyepiece tube 11 connected to the blades 27, 28 by the connecting projection 12 and the arm 33 slides in the direction of the eyepiece optical axis 8, and focusing is performed. The elevating shaft 26, the blades 27, 28, the connecting protrusion 12, the arm 33, and the like remain within the binocular body 1 in any operating state and are arranged so as not to be exposed to the outside.

〔Effect of the invention〕

According to the binocular focusing device of the present invention, even if there are variations in the distance between the focus adjustment drive means and the eyepiece tube, the connecting members protruding from both sides can be connected and fixed without play by screwing. Therefore, it is possible to always obtain a good observation image without blurring of the eyepiece lens. Moreover, by providing a rotation prevention means, the connecting member does not rotate as the screw is tightened, so the connecting member can be connected and fixed in a predetermined direction and in a predetermined positional relationship, resulting in good operation. A binocular focusing device can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of an embodiment of the present invention, cut to include the main part, and FIG. 2 is a front cross-sectional view thereof (H--
3 is a perspective view showing the whole binoculars of the embodiment, FIG. 4 is an exploded perspective view of the connecting member of the embodiment, and FIG. 5 is a sectional view of the connecting part of the connecting member. (V in Figure 3
FIG. 6 is a partial perspective view of a conventional binocular focusing device. DESCRIPTION OF SYMBOLS 1... Binoculars body, 2... Base axis, 3... Eyepiece lens, 4... Objective lens, 5... Porro prism, 6...
... Rolling wheel, 8... Eyepiece optical axis, 9... Guide hole, 11
...Eyepiece tube, 12...Connecting projection, 14...Notch, 26...Elevating shaft, 27.28...Blade, 33
...Connecting arm, 36...Fixing screw, 37...Concave groove, 38...Protrusion. Agent Patent Attorney Kazuhiko Mitsui Figure 1 Figure 5 Figure 2 Figure 6

Claims (2)

[Claims] (1) In a focusing device for binoculars, the left and right eyepiece tubes that support the eyepieces are moved simultaneously forward and backward in the optical axis direction by a single focus adjustment driving means disposed between them to perform focusing. Connecting members are provided laterally projecting from both the adjustment drive means and the eyepiece tube so as to overlap with each other, and the connecting members are fixed with screws, and the connecting members are relative to each other in the direction of rotation of the screw. 1. A focusing device for binoculars, characterized in that a detent means is provided for restricting relative movement of connecting members so that they do not move. (2) A concave groove is formed on one of the connecting members along the protruding direction, and a convex portion that engages with the concave groove is formed on the other connecting member, and these concave grooves and convex portions form the above-mentioned 2. A focusing device for binoculars according to claim 1, further comprising a rotating means.