JPH09146010A - Binoculars - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make binoculars, which can has its short-distance convergence angle corrected, easy, small-sized, and lightweight by making its movable part small. SOLUTION: The binoculars having two optical systems 7 and 8 consisting of objective optical systems 1 and 2, erect prism systems 3 and 4, and ocular optical systems 5 and 6 are equipped with a focusing mechanism which puts the binoculars in focus by moving the objective optical systems 1 and 2 or ocular optical systems 5 and 6 and an eccentric movement mechanism which interlocks with the focusing mechanism to make the objective optical systems 1 and 2 eccentric in parallel nearly at right angles to optical axes 19 and 20. The convergence angle is corrected by making only the objective optical systems 1 and 2 eccentric in parallel to make the movable part smaller than when the convergence angle is corrected by slanting all of the objective optical systems 1 and 2, erect prism systems 3 and 4, and ocular optical systems 5 and 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to binoculars that can be used to view a short distance.

[0002]

2. Description of the Related Art Binoculars are useful not only for observing distant objects, but also for observing plants outdoors and appreciating exhibits at exhibitions, for a short distance of about 1 m. But,
When looking at a short distance at a high magnification, the vergence angle (the angle formed by the light rays emitted from the left and right eyepiece lens systems) becomes extremely large. For example, looking at an object 1 m away with 10 times binoculars is the same as looking at 10 cm in front of the eyes, that is, the state where both eyes are brought close to each other, which puts a great burden on the eyes and is very tired.
Depending on the person, the left and right images may not be fused. Therefore, for example, as disclosed in Japanese Unexamined Patent Publication No. 5-107444, there has been proposed a device that corrects a convergence angle at a short distance by an eccentric means that changes an interval of an objective optical system in cooperation with a focusing mechanism. There is.

[0003]

However, in the above-mentioned conventional example, the decentering mechanism for changing the distance between the objective optical systems is configured to tilt the entire lens barrel including the objective optical system and the eyepiece optical system. In such a configuration, the entire lens barrel moves, which requires a large mechanism, and the size of the movable portion increases, so that it is necessary to increase the strength, and there is a problem that it is large and heavy.

The present invention has been made in order to solve such a problem, and provides binoculars capable of correcting a convergence angle at a short distance with a movable portion being small and having a simpler, smaller and lighter structure. The purpose is to do.

[0005]

The present invention provides an objective optical system,
In binoculars having two sets of optical systems including an erecting prism system and an eyepiece optical system, a focusing mechanism for performing focusing by moving the objective optical system or the eyepiece optical system, and the objective optical system in conjunction with the focusing mechanism. Is provided with an eccentric mechanism for eccentricizing all or a part of the above in a direction substantially perpendicular to the optical axis.

According to the present invention, in binoculars having two sets of optical systems including an objective optical system, an erecting prism system and an eyepiece optical system, all or a part of the objective optical system is moved along a guide member for focusing. And a moving direction along the guide member has a predetermined angle with respect to the optical axis of the objective optical system.

The whole or a part of the objective optical system is decentered in parallel to correct the vergence angle, so that the objective optical system, the erecting prism system, and the eyepiece optical system are all tilted so that they are more movable than those for correcting the vergence angle. The part can be made smaller.

Focusing is performed by moving the whole or a part of the objective optical system along a guide tilted to the optical axis, and by making parallel decentering to correct the convergence angle, both the focusing member and the eccentric member are used. be able to.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIGS. 1 and 2 show a first embodiment of binoculars according to the present invention. FIG. 1A is a plan view showing the internal structure of the binoculars in the infinity state, FIG. 1B is a plan view showing the binoculars in the short distance state, and FIG. 2 is a front view. This binocular has two sets of optical systems 7 and 8 consisting of left and right objective optical systems 1 and 2, erecting prism systems 3 and 4 and eyepiece optical systems 5 and 6, as well as a focusing mechanism and a decentering mechanism. In the focusing mechanism and the eccentric mechanism, a focus ring 14 is fixed to the middle portion of the focus shaft 13 in the front-rear direction, and an elliptical cam 18 is fixed to the tip thereof, and a screw portion 15 is provided at the rear end thereof.
The nut 16 is screwed into the screw 5. And the objective optical system 1
2 is movable in the vertical direction with respect to the optical axes 19 and 20 along the upper and lower guide shafts 9 and 10 which are arranged orthogonally to the focus shaft 13, and the cams 18 are provided by the springs 11 and 12. It is urged so that it always contacts the peripheral edge of the. On the other hand, the eyepiece optical systems 5 and 6 are engaged with the blades 17 fixed to the nut 16.

According to this, when the focus shaft 13 is rotated by the focus ring 14 for a short distance as shown in FIG. 1 (b), the blades 17 pass through the screw portion 15 and the nut 16 in the direction of the focus shaft 13. And the eyepiece optical systems 5 and 6 move in the same direction as that for focusing.
The cam 18 rotates so that the objective optical systems 1 and 2 have optical axes 19 and 20.
The parallel eccentricity and the interval are narrowed, and the convergence angle at a short distance is corrected. In this way, if only the objective optical systems 1 and 2 are decentered in parallel and the convergence angle is corrected, the movable portion becomes smaller than that when the entire optical systems 7 and 8 are tilted, resulting in a compact and simple structure.

(Second Embodiment) FIGS. 3 and 4 show a second embodiment of the present invention. 3 (a) is a plan view showing the internal structure of the binoculars in the infinity state, FIG. 3 (b) is a plan view showing the binoculars in the short distance state, and FIG. 4 is a perspective view near the objective optical system.
This pair of binoculars has two sets of optical systems 7 consisting of left and right objective optical systems 1 and 2, erecting prism systems 3 and 4 and eyepiece optical systems 5 and 6.
8 and a focusing mechanism, the focusing mechanism is configured as follows, unlike the one in the first embodiment. That is, the threaded portion 15 at the tip of the focusing shaft 13
The blade 33 is fixed to the nut 16 screwed into the blade 16, and the objective cylinders 21 and 22 accommodating the objective optical systems 1 and 2 are engaged with the blade 33. The objective barrels 21 and 22 are housed in the lens barrels 23 and 24 so as to move parallel to the optical axes 29 and 30. Further, the objective optical systems 1 and 2 are arranged inside the objective barrels 21 and 22, and the pins 25 and 26 fixed to the objective optical systems 1 and 2 are attached to the objective barrels 2 and 2.
Long hole 31 provided in the upper part of 1.22 in the left-right direction
It is guided by 32 to be movable in the vertical direction with respect to the optical axes 29 and 30, and the pins 25 and 26 are attached to the lens barrel 23.2.
4, cam grooves 27, which are arranged so as to face each other in a narrowed front direction.
28 is engaged. The objective tubes 21 and 22 are engaged with the blades 33 in the axial direction, but are free in the left and right directions. This relationship between the objective cylinder and the blades is the same in the third to fifth embodiments described later.

According to this, when the focus shaft 13 is rotated by the focus ring 14 fixed on the shaft 13 for a short distance as shown in FIG. 3 (b), the blade 33 causes the screw portion 15 and the nut. 16, the objective optical systems 1 and 2 are guided by the lens barrels 23 and 24 to move in the same direction for focusing, and the cam grooves 27 and 26 are moved through the pins 25 and 26. The objective optical systems 1 and 2 are decentered in parallel with the optical axes 29 and 30 by 28, and the interval is narrowed, and the convergence angle at a short distance is corrected. Also in this case, since the convergence angle is corrected by decentering the objective optical systems 1 and 2 only, the movable parts are smaller than when the entire optical systems 7 and 8 are tilted, and the structure is small and simple.

(Third Embodiment) FIGS. 5 and 6 show a third embodiment of the present invention. FIG. 5 is a plan view of the internal structure of the binoculars, and FIG. 6 is a perspective view near the objective optical system. The binoculars have two sets of optical systems 7.8 including an objective optical system 1.2, an erecting prism system 3.4, and an eyepiece optical system 5.6, and a focusing mechanism. The focusing mechanism is the first embodiment. Different from the above, it is constructed as follows. That is, when the focus shaft 13 is rotated by the focus ring 14 fixed to the focus shaft 13, the blade 33 fixed to the nut 16 via the screw portion 15 on the focus shaft 13 and the nut 16 screwed to the screw portion 15. Moves toward the focus axis 13 and the objective optical systems 1 and 2 engaged with the blades 33 move toward the focus axis 13 for focusing. At that time, the objective optical systems 1 and 2 move along the guide rods 35 and 36 arranged parallel to the optical axes 29 and 30, but the guide rods 35 and 3
As shown in FIG. 6, auxiliary rods 37 and 38 for preventing rotation around 6 are provided so as to be inclined with respect to the optical axes 29 and 30 within a plane including the optical axes 29 and 30. Therefore, when the objective optical systems 1 and 2 move along the guide rods 35 and 36, the tilted auxiliary rods 37
・ 38 makes the objective optical systems 1 and 2 guide rods 35 and 36
And the objective optical system 1 and 2 have optical axes 29 and 30
Eccentric parallel to.

According to this, the focus axis 1 for the short distance
When 3 is rotated, the objective optical systems 1 and 2 move to the optical axes 29 and 30.
The objective optical systems 1 and 2 are moved along the optical axes 29 and 30 by the auxiliary rods 37 and 38 while focusing along the optical axes 29 and 30.
The parallel eccentricity and the interval are narrowed, and the convergence angle at a short distance is corrected.

(Fourth Embodiment) FIGS. 7 and 8 show a fourth embodiment of the present invention. FIG. 7 is a plan view of the internal structure of the binoculars, and FIG. 8 is a perspective view near the objective optical system. This embodiment is the same as that of the third embodiment except that the guide rods 35 and 36 are arranged parallel to the inclined auxiliary rods 37 and 38, respectively. According to this, the focus axis 1 for a short distance
When 3 is rotated, the objective optical systems 1 and 2 are focused and move obliquely while decentering parallel to the optical axes 29 and 30, so that the interval is narrowed and the convergence angle at a short distance is corrected. In the fourth embodiment, the guide rods 35 and 36 are used as guide members for guiding the movement of the objective optical systems 1 and 2, but the objective barrel (not shown) accommodating the objective optical systems 1 and 2 is used. The outer periphery may be fitted and guided to the inner surface of a lens barrel (not shown). In this case, the outer circumference of the objective cylinder and the inner surface of the lens barrel, which are the fitting surfaces, may be inclined with respect to the optical axes 29 and 30 of the objective optical systems 1 and 2.

If the objective members 1 and 2 are decentered in parallel by tilting the guide members as in the third and fourth embodiments, the focusing member and the eccentric member can be used together, and the number of parts is increased accordingly. Can be reduced.
In the above embodiment, focusing is performed by moving the entire objective optical system 1 or 2 or the entire eyepiece optical system 5 or 6. However, as in the next fifth embodiment, a part of the objective optical system 1 or 2 is used. Alternatively, focusing may be performed by moving a part of the eyepiece optical systems 5 and 6.

(Fifth Embodiment) FIG. 9 shows a fifth embodiment of the present invention. 9A is a plan view showing the internal structure of the binoculars in the infinity state, and FIG. 9B is a plan view showing the binoculars in the short distance state. In this embodiment, the objective optical system 1/2 is composed of the positive front lens group 39/40 and the negative rear lens group 41/42, and the objective optical system 1/4 of the fourth embodiment is used.
The inclined guide rods 35 and 36 and the auxiliary rod 37 provided for the second
・ The same guide rods 35 and 36 and auxiliary rods 37 and 38 as 38
Is the same as that of the fourth embodiment except that the rear group lenses 41 and 42 are equipped with. Therefore, when the focus shaft 13 is rotated by the focus ring 14 fixed to the focus shaft 13, the blade 3 fixed to the nut 16 via the screw portion 15 on the focus shaft 13 and the nut 16 screwed to the screw portion 15
3 moves in the focus axis 13 direction, and the rear group lenses 41 and 42 engaged with the blades 33 move in the focus axis 13 direction for focusing. The rear lens groups 41 and 42 are guided by the guide rods 35 and 36 and the auxiliary rods 37 and 38, and the optical axes 29 and
It moves diagonally while decentering parallel to 30.

According to this, the focus axis 1 for a short distance
When 3 is rotated, the rear lens groups 41, 42 are focused and decentered parallel to the optical axes 29, 30 to widen the distance, and the convergence angle at a short distance is corrected.

[0019]

According to the present invention, the convergence angle is corrected by decentering the whole or a part of the objective optical system in parallel, so that the objective optical system, the erecting prism system, and the eyepiece optical system are all tilted to converge the convergence angle. The movable part can be made smaller than the correction of the above, and the overall configuration can be made simple, small, and lightweight. In addition, since a new optical member such as a variable apex angle rhythm is not required for correcting the convergence angle, it can be manufactured simply and inexpensively.

Focusing is performed by moving the whole or a part of the objective optical system along a guide inclined to the optical axis, and parallel decentering is performed to correct the convergence angle. The number of parts and the number of assembling steps can be reduced.

[Brief description of the drawings]

FIG. 1A shows an internal structure of the binoculars according to the first embodiment.
FIG. 2B is a plan view showing a state, and FIG.

FIG. 2 is a front view of the binoculars of the first embodiment.

FIG. 3A shows an internal structure of the binoculars of the second embodiment by ∞
FIG. 3B is a plan view showing a state, and FIG.

FIG. 4 is a perspective view around an objective optical system of the binoculars of the second embodiment.

FIG. 5 is a plan view of the internal structure of the binoculars of the third embodiment.

FIG. 6 is a perspective view around the objective optical system of the binoculars of the third embodiment.

FIG. 7 is a plan view of the internal structure of the binoculars of the fourth embodiment.

FIG. 8 is a perspective view around the objective optical system of the binoculars of the fourth embodiment.

FIG. 9A shows the internal structure of the binoculars of the fifth embodiment by ∞
FIG. 3B is a plan view showing a state, and FIG.

[Explanation of symbols]

 1.2 Objective optical system 3.4 Erect prism system 5.6 Eyepiece optical system 7.8 Optical system 13 Focus axis 18 Cam 19/20 Optical axis of objective optical system 21/22 Objective tube 23/24 Lens tube 25 / 26 pin 27/28 cam groove 29/30 optical axis 31/32 long hole 35/36 guide rod 37/38 rotation stop auxiliary rod

Claims (2)

[Claims] 1. Binoculars having two sets of optical systems consisting of an objective optical system, an erecting prism system and an eyepiece optical system, and a focusing mechanism for performing focusing by moving the objective optical system or the eyepiece optical system, and the focusing. Binoculars comprising an eccentric mechanism for interlocking the whole or a part of the objective optical system in parallel with the mechanism in a direction substantially perpendicular to the optical axis. 2. In binoculars having two sets of optical systems including an objective optical system, an erecting prism system and an eyepiece optical system, focusing is performed by moving all or part of the objective optical system along a guide member. Binoculars comprising a focusing mechanism, wherein a moving direction along the guide member has a predetermined angle with respect to an optical axis of the objective optical system.