JP3196613B2 - binoculars - Google Patents

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 It is convenient if binoculars can be used not only for viewing far away, but also for observing plants at an outdoor or appreciating exhibits at exhibitions, as well as for viewing short distances of about 1 m. But,
When viewing a close-up object at a high magnification, the angle of convergence (the angle formed by the light beams emitted from the left and right eyepiece systems) becomes extremely large. For example, viewing a subject 1 m away with 10 × binoculars is the same as viewing 10 cm in front of the eyes, that is, a state in which both eyes are brought closer, and the eyes are greatly strained and very tired.
Also, depending on the person, the left and right images may not be fused. Therefore, for example, as disclosed in Japanese Patent Application Laid-Open No. Hei 5-107444, there has been proposed a device which corrects a convergence angle at a short distance by an eccentric means which changes an interval between objective optical systems in conjunction with a focusing mechanism. I have.

[0003]

However, in the above-mentioned conventional example, the eccentric 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 mechanism becomes large because the entire lens barrel moves, and the strength of the movable part becomes large because the movable part becomes large.

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 simpler, smaller, and lighter configuration in which a movable portion can be reduced. The purpose is to do.

[0005]

The present invention provides an objective optical system,
In a pair of 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 interlocking with the focusing mechanism Is provided with an eccentric mechanism for eccentrically or entirely eccentrically parallel to the optical axis in a direction substantially perpendicular to the optical axis.

According to the present invention, there is provided a binocular having two sets of an optical system including an objective optical system, an erecting prism system and an eyepiece optical system, wherein the whole or a part of the objective optical system is guided without moving the eyepiece optical system. by moving along the member, characterized in that includes a focusing mechanism for focusing, the moving direction along the guide member has a certain predetermined angle with respect to the optical axis of the objective optical system is there.

[0007] By correcting the convergence angle by decentering the whole or a part of the objective optical system in parallel, it is possible to move the objective optical system, the erecting prism system and the eyepiece optical system more than to correct the convergence angle by tilting all of them. The part can be made smaller.

Further , without moving the eyepiece optical system,
Focusing is performed by moving the entire or a part of the objective optical system along a guide inclined to the optical axis, and by performing parallel eccentricity and correcting the convergence angle, the focusing member and the eccentric member can be used together. .

[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 a triangle state, FIG. 1B is a plan view showing the close-up state, and FIG. 2 is a front view. The binoculars have two sets of optical systems 7, 8 including left and right objective optical systems 1, 2, erect prism systems 3, 4, and eyepiece optical systems 5, 6, a focusing mechanism and an eccentric mechanism. The focusing mechanism and the eccentric mechanism fix a focusing ring 14 at an intermediate portion in the front-rear direction of a focusing shaft 13 and an elliptical cam 18 at a tip thereof, and provide a threaded portion 15 at a rear end thereof.
A nut 16 is screwed into 5. And the objective optical system 1
2 is movable vertically in relation to the optical axes 19 and 20 along upper and lower guide shafts 9 and 10 arranged orthogonally to the focus shaft 13, and the cams 18 are moved by springs 11 and 12. It is urged to always contact the peripheral edge of. 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. 1B, the blade 17 is moved in the direction of the focus shaft 13 via the screw portion 15 and the nut 16. And the eyepiece optical systems 5 and 6 move in the same direction to focus,
The cam 18 rotates and the objective optical systems 1 and 2 move to the optical axes 19 and 20.
, The interval becomes narrower, and the convergence angle at a short distance is corrected. When the convergence angle is corrected by decentering only the objective optical systems 1 and 2 in this manner, the movable portion is smaller than that of tilting the entire optical systems 7 and 8, resulting in a compact and simple structure.

(Second Embodiment) FIGS. 3 and 4 show a second embodiment of the present invention. FIG. 3A is a plan view showing the internal structure of the binoculars in a ∞ state, FIG. 3B is a plan view showing the close-up state, and FIG. 4 is a perspective view near the objective optical system.
The binoculars are composed of two sets of optical systems 7, including left and right objective optical systems 1 and 2, erect prism systems 3 and 4, and eyepiece optical systems 5 and 6.
8 and a focusing mechanism, which is different from that of the first embodiment and is configured as follows. That is, the screw portion 15 at the tip of the focus shaft 13
The blade 33 is fixed to the nut 16 screwed to the, and the objective tubes 21 and 22 containing the objective optical systems 1 and 2 are engaged with the blade 33. The objective tubes 21 and 22 are accommodated 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 have pins 25 and 26 fixed to the objective optical systems 1 and 2 in the objective tubes 2 and 22, respectively.
A long hole 31 in the left-right direction provided at the top of
32, the pins 25 and 26 are movable vertically with respect to the optical axes 29 and 30.
4, cam grooves 27 arranged opposite to each other so as to narrow forward.
28. The objective tubes 21 and 22 are axially engaged with the blades 33, but are free in the left and right directions. This relationship between the objective tube and the blade is the same in the third to fifth embodiments described later.

According to this, when the focus shaft 13 is rotated by a focus ring 14 fixed on the shaft 13 for a short distance as shown in FIG. The objective optical system 1.2 is guided by the lens barrels 23 and 24 and moves in the same direction to perform focusing, and the cam grooves 27 and 26 are moved through the pins 25 and 26. Due to 28, the objective optical systems 1 and 2 are decentered parallel to the optical axes 29 and 30 to narrow the interval, and the convergence angle at a short distance is corrected. Also in this case, since the convergence angle is corrected by decentering only the objective optical systems 1 and 2 in parallel, the movable portion is smaller than inclining the entire optical systems 7 and 8, resulting in a small and simple structure.

(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. It is configured as follows unlike the above. 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 thereto. Moves in the direction of the focus axis 13, and the objective optical systems 1 and 2 engaged with the blade 33 move in the direction of the focus axis 13 to perform focusing. At this time, the objective optical systems 1 and 2 move along guide rods 35 and 36 disposed in parallel with the optical axes 29 and 30.
As shown in FIG. 6, the auxiliary rods 37 and 38 for stopping rotation around 6 are provided to be inclined with respect to the optical axes 29 and 30 in 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 inclined auxiliary rod 37
38 allows the objective optical systems 1 and 2 to become guide rods 35 and 36
, And the objective optical systems 1 and 2 have optical axes 29 and 30
Eccentric parallel to.

According to this, the focus axis 1 is set for a short distance.
3 rotates the objective optical systems 1 and 2 to the optical axes 29 and 30
Focusing by moving along, the objective optical systems 1 and 2 are moved by the auxiliary rods 37 and 38 to the optical axes 29 and 30.
, The interval becomes narrower, 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 the third embodiment except that the guide rods 35 and 36 are arranged in parallel with the inclined auxiliary rods 37 and 38, respectively. According to this, the focus axis 1 for a short distance
When the lens 3 is rotated, the objective optical systems 1 and 2 perform focusing and move obliquely while being decentered in parallel to the optical axes 29 and 30, so that the interval becomes narrower, 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 guide rods 35 and 36 are used for the objective tubes (not shown) that house the objective optical systems 1 and 2. The outer periphery may be fitted to the inner surface of a lens barrel (not shown) for guiding. In this case, the outer periphery of the objective tube and the inner surface of the lens barrel, which are the fitting surfaces, may be inclined with respect to the optical axes 29, 30 of the objective optical systems 1, 2.

If the objective optical systems 1 and 2 are decentered in parallel by inclining the guide member as in the third and fourth embodiments, the focusing member and the eccentric member can be used, and the number of parts can be reduced accordingly. Can be reduced.
In the above embodiment, focusing is performed by moving the entire objective optical system 1.2 or the entire eyepiece optical system 5.6. However, as in the following fifth embodiment, a part of the objective optical system 1.2 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. FIG. 9A is a plan view showing the internal structure of the binoculars in a triangle state, and FIG. 9B is a plan view showing the internal structure of the binoculars in a short distance state. In this embodiment, the objective optical systems 1 and 2 are made up of the positive front group lenses 39 and 40 and the negative rear group lenses 41 and 42, and then the objective optical systems 1 and 2 of the fourth embodiment are used.
Guide rods 35 and 36 and auxiliary rods 37 provided in 2
Guide rods 35 and 36 and auxiliary rods 37 and 38 that are the same as 38
Is the same as that of the fourth embodiment except that the rear group lenses 41 and 42 are provided. 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 thereto.
3 moves in the direction of the focus axis 13 and the rear group lenses 41 and 42 engaged with the blade 33 move in the direction of the focus axis 13 to perform focusing. The rear group lenses 41 and 42 are guided by guide rods 35 and 36 and auxiliary rods 37 and 38 so that the optical axis 29
It moves obliquely while being eccentric parallel to 30.

According to this, the focus axis 1 is set for a short distance.
When the lens 3 is rotated, the rear group lenses 41 and 42 are focused, and are parallel eccentric with respect to the optical axes 29 and 30, so that the interval is widened, 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 all of the objective optical system, the erecting prism system and the eyepiece optical system are tilted to make the convergence angle. Therefore, the movable portion can be made smaller than that of correcting, and the entire configuration can be made simpler, smaller, and lighter. Further, since a new optical member such as a variable apex angle burr is not required for correcting the convergence angle, it can be manufactured simply and inexpensively.

Also, without moving the eyepiece optical system,
Focusing is performed by moving the entire or a part of the objective optical system along a guide inclined to the optical axis, and the convergence angle is corrected by performing parallel eccentricity, so that the focusing member and the eccentric member are also used. The number of parts and the number of assembly steps can be reduced.

[Brief description of the drawings]

FIG. 1A shows the internal structure of the binoculars of the first embodiment.
FIG. 3B is a plan view showing the state, and FIG.

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

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

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

FIG. 5 is a plan view of an internal structure of binoculars according to a third embodiment.

FIG. 6 is a perspective view of the vicinity of an objective optical system of binoculars according to a third embodiment.

FIG. 7 is a plan view of an internal structure of binoculars according to a fourth embodiment.

FIG. 8 is a perspective view of the vicinity of an objective optical system of binoculars according to a fourth embodiment.

FIG. 9A shows the internal structure of the binoculars of the fifth embodiment.
FIG. 3B is a plan view showing the 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 Auxiliary rod for stopping rotation

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02B 23/18 G02B 23/06

Claims (3)

(57) [Claims] 1. A binocular having two optical systems including an objective optical system, 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 focusing mechanism. A pair of binoculars, further comprising an eccentric mechanism that cooperates with the mechanism to eccentrically or entirely decenter the objective optical system in a direction substantially perpendicular to an optical axis. Wherein the objective optical system in the binoculars having two pairs of optical systems consisting of erecting prism system and an eyepiece optical system, wherein
By moving the entire or a part of the objective optical system along the guide member without moving the eyepiece optical system ,
A pair of binoculars including a focusing mechanism for performing focusing, wherein a moving direction along the guide member has a predetermined angle with respect to an optical axis of the objective optical system. 3. A pair of binoculars having two optical systems including an objective optical system, an erecting prism system, and an eyepiece optical system, wherein the entirety or a part of the objective optical system is fixed to an optical axis of the objective optical system. angle to guide in a direction having a comprises an eccentric member also serving as a focusing member, said eyepiece optical system
Binoculars wherein focusing is performed by moving the whole or a part of the objective optical system while being guided by the eccentric member without moving the lens.