JPH09171143A - Lens frame for binoculars - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent observation from being disturbed because the lenses of spectacles come in contact with a lens frame by forming the end face of the lens frame opposed to an observer as a concave surface having a given curvature. SOLUTION: An eye pad ring 37 is fit-inserted to the outer periphery of a rear lens barrel 31 and the screw part 351 of an ocular frame 35 is engaged with a screw part 316 formed at the rear end of the rear lens barrel 31. In the case the observer wears the spectacles, the binoculars are used in a state where the ring 37 is pushed in, and in the case the observer does not wear the spectacles, the binoculars are used in a state of the ring 37 being pulled out. When the observer wearing the spectacles looks through the binoculars, the center part of the lenses of the spectacles is projected to the frame 35. The end face 352 of the frame 35 opposed to the observer is formed as the concave surface having the radius of curvature R2 so as to prevent the spectacles from touching the binoculars even when the observer looks through the binoculars as he(she) wears the spectacles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens frame for holding a lens closest to an observer in binoculars.

[0002]

2. Description of the Related Art A lens frame for holding a lens closest to an observer of binoculars has an end face facing the observer.

[0003]

However, conventionally, the above-mentioned end face has been formed as a flat surface. Therefore, when the observer wearing the glasses removes the binoculars, the lens of the glasses has a predetermined curvature and protrudes toward the center of the lens, so that the lens of the glasses comes into contact with the lens frame and interferes with viewing. There was a problem.

In view of the above circumstances, the present invention has an object to provide a lens frame that does not interfere with the glasses.

[0005]

In order to solve the above problems, the lens frame of the binoculars of the present invention holds the lens closest to the observer, and the end face facing the observer has a predetermined curvature. It is characterized in that it is formed as a concave surface. Further, the predetermined curvature can be configured to be larger than the curvature of the lens of the spectacles. Further, the lens frame is formed with a threaded portion, and by screwing the threaded portion into the threaded portion formed on the barrel of each telescopic optical system,
The lens frame may be fixed to the lens barrel.

Further, by fixing the lens frame to the lens barrel, another lens forming the eyepiece optical system may be positioned in the optical axis direction with respect to the lens barrel of the telescopic optical system. Furthermore, an eyepiece ring movable in the optical axis direction is fitted to the eyepiece of the lens barrel of the telescopic optical system, and at least a part of the lens frame is formed larger than the outer shape of the eyepiece, and the lens frame is A structure that prevents the eyepiece ring from falling off the lens barrel is also possible.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the variable power binoculars of the present embodiment. As shown in FIG. 1, the binoculars 10 are provided with a pair of left and right telescopic optical systems 10L and 10R and a front frame 20. Further, a focus adjustment knob 183, a diopter difference adjustment knob 184, and a variable power operation knob 50 are arranged side by side on the upper portion of the binoculars 10. In the following description, the subject side will be referred to as “front” and the observer side will be referred to as “rear”.

FIG. 2 is an exploded perspective view of the binoculars 10 of FIG. As shown in FIG. 2, the telephoto optical system 10L (10R)
Has a front lens barrel 13 (14), an intermediate lens barrel 15 (16), and a rear lens barrel 31 (32). Front lens barrel 13 (14)
Is a pair of left and right bores 201 provided in the front frame 20.
By being fitted to (202), it is rotatably supported. Behind the front lens barrel 13 (14), there is an intermediate lens barrel 15 (1
6) is fixed, and the rear lens barrel 31 (32) is fixed behind the intermediate lens barrel 15 (16).

The rear lens barrel 31 (32) is connected to the front lens barrel 13 (1).
4), the central axis is arranged so as to be eccentric by a predetermined amount. The rear lens barrel 31 (32) is supported by the rear frame 25 so that the rear lens barrel 31 (32) can swing with the rotation of the front lens barrel 13 (14).

FIG. 3 is a plan view showing the internal structure of the binoculars 10. As shown in FIG. 3, the front lens barrel 13 (14) is
The first lens 132 (142) is housed. The first lens 132 (142) is the first lens frame 131 (141).
The first lens frame 131 (141)
Is movably supported in the front lens barrel 13 (14).

The intermediate lens barrel 15 (16) is provided with two prisms 151, 152 (161, 162). Both prisms 151 and 152 (161 and 162) are arranged so that the ridge lines thereof are at right angles, forming a so-called Porro prism erecting system. Accordingly, the first lens 132
The inverted image that has passed through (142) is inverted and becomes erect.

The rear lens barrel 31 (32) has a second lens 112.
(122) and the third lens 113 (123) are housed. Second lens 112 (122) and third lens 113
(123) is the second and third lens frames 81 and 91 (8
2, 92). The second and third lens frames 81, 91 (82, 92) are movably provided by the rear lens barrel 31 (32).

The first lens 132 (142) and the second lens 112 (122) form an objective optical system, and the third lens 1
13 (123) and the 4th lens 114 (124) comprise the eyepiece optical system. A field ring 17 for defining a field of view is provided at a position where an image is formed by the objective optical system.
b (18b) is provided.

In the following description, when simply referred to as "optical axis direction", the optical axis of the first lens 132 (142) and the second lens 112 (122) to the fourth lens 1 are used.
14 (124) is a direction parallel to the optical axis.

In the binoculars 10 of this embodiment, the second lens 112 (122) which is a part of the objective optical system and the third lens 113 (123) which is a part of the eyepiece optical system are respectively arranged in the optical axis direction. It is configured to perform zooming by moving.

FIG. 4 shows the second and third lenses 112 and 11.
3 is a side sectional view of the binoculars 10 showing a moving range of No. 3; FIG. In FIG. 4, the positions of the two lenses 112 and 113 in the telephoto state are shown above the optical axes of the second and third lenses 112 and 113, and the positions in the wide-angle state are shown below the optical axes.

In FIG. 2, the front frame 20 and the front lens barrel 1 are shown.
3, 14 and the intermediate barrels 15 and 16 form a front unit 200, and the rear frame 25 and the rear barrels 31 and 32 form a rear unit 100. The binoculars 10 are assembled by assembling the rear unit 100 to the front unit 200.

A shoulder portion 133 (143) is formed on the outer periphery of the front lens barrel 13 (14).
33 (143) contacts the inner edge of the bore 201 (202). Thereby, the front frame 2 of the front lens barrel 13 (14)
Axial positioning with respect to 5 is performed. Rear lens barrel 31
(32) is a rear end surface 15a (1) of the intermediate lens barrel 15 (16).
6a) has an end face 31a (32a) that comes into contact with the rear lens barrel 31 with respect to the intermediate lens barrel 15 (16).
(32) is axially positioned.

The above-mentioned end face 31 of the rear frame 31 (32)
Positioning pins 31b (32b) are formed on a (32a), and the positioning pins 31b (32b) are formed in holes 15b (16b) formed in the rear end surface 15a (16a) of the intermediate lens barrel 15 (16). It is inserted. Thus, the rear frame 31 (32) is positioned with respect to the intermediate lens barrel 15 (16) in the plane orthogonal to the axial direction.

Further, guide bars 311 and 312 extending toward the front frame 20 are formed on the rear frames 31 and 32 so as to project therefrom. At the rear end of the front frame 200, holes 153 and 163 with which the guide bars 311 and 312 engage are formed, and serve as a guide when the rear frame 100 is assembled to the front frame 200.

On the outer circumferences of the intermediate lens barrels 15 and 16 facing each other, the intermediate lens barrels 15 and 16 (and the rear lens barrels 31 and 32 attached to the rear of the intermediate lens barrels 15 and 16) are interlocked to swing. Sector gears 154 and 164 that engage with each other are formed.

FIG. 5 is an exploded perspective view of the rear unit 100. On the rear end surfaces of the rear lens barrels 31, 32, the intermediate lens barrel 15,
Swing shafts 321 and 322 (shown by dotted lines in the drawing) are formed to project rearward at the swing center of 16, that is, at a position corresponding to the optical axes of the first lenses 13 and 14.

Through holes 2 are formed in the rear frame 25 to allow the swing shafts 321 and 322 of the rear lens barrels 31 and 32 to pass therethrough.
51 and 252 are formed. Also, the swing shaft 321,
Screw holes 321a and 322a are formed at the tip of 322. Then, the through holes 251, 25 of the rear frame 25
2 through the swing shafts 321, 322,
The screw holes 321a and 322a of 322 have screws 321b and 3
By fixing 22b, the rear barrels 31 and 32 are swingably supported by the rear frame 25.

In this way, the front unit 200 is assembled as a unit by inserting the left and right front lens barrels 13 and 14 to which the intermediate lens barrels 15 and 16 are attached into the front frame 20. Further, the swing shafts 321 and 3 of the left and right rear lens barrels 31 and 32 are
The rear unit 100 is assembled as a unit by inserting and fixing 22 into the holes 251 and 252 of the rear frame 25. That is, the front unit 200 and the rear unit 10
0 can be assembled and stored in advance, and when assembled, the front unit 200 and the rear unit 100 are assembled to form the binoculars 10.

Here, as shown in FIG. 2, the first lens 13 among the lenses of the left and right telescopic optical systems 10L and 10R is used.
2, 142 belong to the front unit 200, and the second lens 112, 122, the third lens 113, 123 and the fourth lens 114, 124 (both of which are shown in FIG. 3) are the rear unit 10.
Belongs to 0. Therefore, in this embodiment, the front lens barrels 13 and 1 are
Even when the position of the optical axis 4 is deviated, when the rear unit 100 is assembled to the front unit 200, the first lenses 132 and 142 belonging to the front unit 200 and the second lenses 112 and 122 belonging to the rear unit 100. (Figure 3)
The distance between and is the same on the left and right.

That is, in FIG. 5, the rear lens barrels 31, 32 are
The lengths of the swing shafts 321 and 322 are set so that the rear frame 25 is held with a certain amount of margin left in the optical axis direction. Therefore, when the rear unit 100 is assembled to the front unit 200 as shown in FIG. 2, the positions of the rear lens barrels 31 and 32 in the optical axis direction are the intermediate lens barrels 15 and 16, respectively.
Follow the position in the optical axis direction of. Thus, the first lens 13
The distances 2, 142 and the second lenses 112, 122 (FIG. 3) are the same on the left and right.

Next, a mechanism for moving and driving the second lenses 112, 122 and the third lenses 113, 123 (FIG. 3) in the rear lens barrels 31, 32 in the optical axis direction will be described.
As shown in FIG. 5, the rear lens barrels 31 and 32 include cam rings 61 and 62 for moving and driving the second lenses 112 and 122 and the third lenses 113 and 123 (FIG. 3) in the optical axis direction, and Second lens 112, 122 and third lens 113, 123
A guide ring 71 for holding the lens movably in the optical axis direction,
72 is inserted.

FIG. 6 is a perspective view of the left cam ring 61. As shown in FIG. 6, the cam ring 61 includes a tubular portion 612,
It comprises an arcuate wall 617 formed on one end surface of the tubular portion 612, and an extending wall 611 extending from the axial end surface of the arcuate wall 617. The arcuate wall 617 and the extending wall 611 form an arc along the outer peripheral surface of the cylindrical portion 612. Also,
The outer diameter (from the center of the arc) of the extension wall 611 is the arc-shaped wall 61.
The shoulder surface 617a is formed on the end surface of the arc-shaped wall 612 by a predetermined amount smaller than 7.

A portion of the cylindrical portion 612 having a predetermined length in the axial direction from the end surface 618 serves as a winding portion 619 for winding a belt member described later. The outer diameter of the winding portion 619 is set to be slightly smaller than the other portion of the cylindrical portion 612. As a result, the clearance C shown in FIG. 3 is formed between the outer surface of the winding portion 619 and the inner surface of the rear lens barrel 31.

Further, in order to lock the belt member described later,
Two slits 615, 616 parallel to the winding portion 619
Are formed. The slits 615 and 616 further extend to the shoulder surface 617a of the arcuate wall 617.

A first cam groove 613 for moving the second lens 112 is formed on the extending wall 611. Further, the cylindrical portion 612 is formed with two second cam grooves 614 and 614 for moving the third lens 122.

FIGS. 7A and 7B show the guide ring 7 on the left side.
It is a perspective view and a side sectional view showing 1. The guide ring 71 is
It has a cylindrical portion 712, an arcuate wall 711 extending from the end surface of the cylindrical portion 712, and a flange portion 715 formed on the other end surface of the cylindrical portion 712. The position of the guide ring 71 is finely adjusted on the flange portion 715 (described later).
Is formed with a pair of outer peripheral gears 716.

Three guide grooves 717 extending in the axial direction are formed on the inner surface of the arc-shaped wall 711 at intervals of 90 ° in the circumferential direction. An elongated hole 713 extending along the groove is formed in the central guide groove 717 of the three. In addition, the tubular portion 7
On the inner surface of 12, four guide grooves 718 extending in the axial direction are formed at intervals of 90 ° in the circumferential direction.
The guide groove 718 of the book has a long hole 7 extending along the groove.
14 are formed.

FIG. 8 is an exploded perspective view showing the left and right cam rings 61 and 62, the guide rings 71 and 72, the second lens frames 81 and 82, and the third lens frames 91 and 92. As shown in FIG. 8, the guide rings 71, 72 are symmetrically configured,
The cam rings 61 and 62 are configured similarly to the left and right.

As shown in FIG. 8, the second lens frame 81 (8
The slider 811 (8
21) are formed four at intervals of 90 ° in the circumferential direction. The slider 811 (812) has screw holes 812, respectively.
(822) is formed, and the cam follower 813 (8
23) can be screwed. Similarly, four sliders 911 (921) extending in the axial direction are formed on the outer circumference of the third lens frame 91 (92) at intervals of 90 ° in the circumferential direction. Screw holes 912 (922) are formed in the sliders 911 (921), respectively, and the cam followers 913 (923) can be screwed therein.

By engaging the slider 811 of the second lens frame 81 with the guide groove 717 (FIG. 7) of the guide ring 71, the second lens frame 81 is held by the guide ring 71 slidably in the optical axis direction. It Similarly, by engaging the slider 911 of the third lens frame 91 with the guide groove 718 (FIG. 7) of the guide ring 71, the third lens frame 91 is moved to the guide ring 7
1 is held slidably in the optical axis direction.

The four sliders 811 of the second lens frame 81
Of these, only one engages with the guide groove 717 (FIG. 7) in which the elongated hole 713 (FIG. 7) is formed. A cam follower 813 is fixed in the screw hole 812 of the one slider 811, and the cam follower 813 penetrates the long hole 713 (FIG. 7) and engages with the cam groove 613 of the cam ring 61.

Similarly, among the four sliders 911, cam followers 913 are provided in the screw holes 912 of the sliders 911 engaged with the guide grooves 718 (FIG. 7) in which the elongated holes 714 are formed.
Is fixed, and the cam follower 913 penetrates the elongated hole 714 and engages with the cam groove 614 of the cam ring 61.

Because of this structure, the cam ring 6
When 1 rotates, the cam follower 81 of the second lens frame 81
3 and the cam follower 913 of the third lens frame 91 slide along the cam grooves 613 and 614 of the cam ring 61, and
The slider 811 of the second lens frame 81 and the third lens frame 91
Of the guide ring 717, 7 of the guide ring 71.
Slide along 18. That is, the left second and third lens frames 81 and 91 move in the guide ring 71 in the axial direction by the rotation of the cam ring 61. Similarly, the second and third on the right side
The lens frames 82 and 92 move in the guide ring 72 in the axial direction by the rotation of the cam ring 62.

Here, the diameter of the cam followers 813 and 913 is set to be smaller than the width of the long holes 713 (FIG. 7) and 714 by a predetermined amount. Therefore, the guide grooves 717 (FIG. 7), 7
18 and the sliders 811 and 911 are engaged with each other,
The cam followers 813 and 913 do not contact the side surfaces of the elongated holes 713 and 714. That is, the second and third lens frames are
A portion that contacts the cam groove and a portion that contacts the guide groove are separately provided. Further, since the sliders 811 and 911 also serve as reinforcing members for the lens frames 81 and 91 themselves, the cam ring 6
The lens frame 8 when an excessive force is applied to the rotation of 1
The damage of 1, 91 is prevented.

In this embodiment, the guide rings 71, 7
2 is fixed and the cam rings 61 and 62 are rotated, but it is also possible to fix the cam rings 61 and 62 and rotate the guide ring.

Here, since the sliders 811 and 911 and the guide grooves 717 and 718 (FIG. 7) are formed at equal intervals, (the circumference of the left and second lens frames 81 and 91 relative to the guide ring 71). Mounting angle is 90 in the circumferential direction.
Can be changed at intervals. Similarly, the mounting angle (in the circumferential direction) of the right and second lens frames 82, 92 with respect to the guide ring 72 can be changed at intervals of 90 ° in the circumferential direction.

Therefore, after the binoculars 10 have been assembled, when a so-called visual field difference phenomenon occurs in which the range of the visual field (the range limited by the visual field frame) is different between the left and the right due to the error in assembling the lens, etc. Second lens frame 81, 8
2, or the guide ring 71 of the third lens frame 91, 92,
By changing the direction of attachment to 72, it is possible to correct the left and right visual fields.

Next, a structure for driving the left and right cam rings 61, 62 in a linked manner will be described. FIG. 9 is a perspective view showing the rear unit 100. The rear lens barrel 3
1, 32 are shown by dotted lines. As shown in FIG. 9A, the rear unit 100 is provided with a belt member 40 (interlocking member) for interlocking the left and right cam rings 61 and 62. The belt member 40 is wound around the winding portions 619 (FIG. 6) and 629 formed on the cam rings 61 and 62. Further, the rear frame 25 is provided with a variable power operation knob 50 for driving the belt member 40.

The shape of the belt member 40 is shown in FIG. As shown in FIG. 10A, the portions 40a having a predetermined length at both ends of the belt member 40 are configured to have a radius of curvature R1. The radius of curvature R1 is set to be the same as the outer diameter of the winding portions 619 and 629 of the cam rings 61 and 62. The belt member 40 is made of a metal plate or the like having sufficient flexibility to be wound around the cam rings 61 and 62 and having a toughness capable of transmitting a load due to “push” and “pull” in the length direction. In this embodiment, Hastelloy C-22 manufactured by Mitsubishi Materials Corporation, which is a kind of nickel-chromium-molybdenum alloy, is used.

Both ends of the belt member 40 are bent toward the virtual center of the above-mentioned radius of curvature R1 to form locking ends 41. Further, there is provided a locking claw 42 which is formed by cutting a substantially quadrangular portion with one side left and bending it at the one side at a predetermined distance from the locking end 41. Locking end 41
The interval between the locking claw 42 and the locking claw 42 will be described later. Further, a connecting portion 43 for driving and operating the belt member 40 is formed at the center of the belt member 40 in the length direction.

FIG. 11 shows the belt member 40 and the rear lens barrel 31,
It is the front view which looked at 32 from the front. The guide ring 7
1, 72 and each lens frame are omitted. As shown in FIG. 11, one locking end 41 a of the belt member 40 and the locking claw 42
a is a slit 615 formed on the left cam ring 61,
616, the other locking end 41b and locking claw 42b
Are slits 625, 6 formed in the right cam ring 62.
26 is engaged.

Winding portions 619 and 629 of the cam rings 61 and 62
Between the rear lens barrels 31 and 32 and the inner surfaces of the rear lens barrels 31 and 32.
The above-mentioned clearance C (FIG. 3) for passing through is provided. In addition, the rear lens barrels 31 and 32 have winding parts 619,
4 each for guiding the belt member 40 to and from 629
Presser roller groups 313 and 323 each including rollers are provided.

In order to hold the belt member 40 at the swing center (when adjusting the interpupillary distance), the left and right rear lens barrels 31 and 32 are provided with first support roller pairs 314 and 324, respectively.
The first support roller pairs 314 and 324 are arranged such that the intermediate portions 314a and 324a of the respective roller pairs correspond to the swing center (swing shafts 321 and 322 in FIG. 5).

Further, second support roller pairs 315 and 325 are provided adjacent to the first support roller pairs 314 and 324, respectively. The clearance between the rollers of the first support roller pair 314, 324 and the second support roller pair 315, 325 is the clearance C between the winding portions 619, 629 of the cam rings 61, 62 and the inner surface of the rear lens barrel 31, 32 ( 3), and the clearance between the winding portions 619 and 629 and the pressing roller groups 313 and 323 is set to be slightly larger.

With such a configuration, when the belt member 40 is driven by the operation member described later, for example, in the left direction (right direction in FIG. 11) when viewed from the observer, the belt member 40 is moved to the left cam ring. 61 is pressed and rotated clockwise in the figure, and the right cam ring 62 is pulled and rotated clockwise in the figure. In this manner, the belt member 40 causes the left and right cam rings 61 and 62 to interlock and rotate.

When the rear lens barrels 31 and 32 swing as shown in FIGS. 11 and 12, the belt member 40 moves to the portions 314a and 324a corresponding to the swing shafts of the rear lens barrels 31 and 32.
Can be bent gently around. At this time, the rear lens barrel 3
The rocking of the belt members 40 causes the cam rings 61 and 62 to swing.
There is no turning.

Since the sliding contact portion 44 corresponding to the portion outside the bent corner of the locking end 41 of the belt member 40 has a predetermined curvature, the sliding contact portion when the belt member 40 moves. 44 does not get caught on the inner surfaces of the rear lens barrels 31 and 32, and smoothly slides along the inner surfaces of the rear lens barrels 31 and 32.

Here, the interval between the locking end 41 and the locking claw 42 of the belt member 40 is determined by the slit 615 and the slit 616.
Is shorter than the distance between the slits 625 and 626 by a predetermined amount. Further, when the belt member 40 is wound around the cam rings 61 and 62, as shown in FIG. 10B, the tips of the locking end 41 and the locking claw 42 are narrowed.

Therefore, the one locking end 4 of the belt member 40 is
1 and the locking claw 42 are engaged with the slits 615 and 616,
The other locking end 41 and the locking claw 42 are provided with slits 625, 62.
When it is engaged with 6, the engaging end 41 and the engaging claw 42 clamp what is sandwiched therebetween. Therefore, the locking end 4
1, 41 are securely engaged with the cam rings 61, 62 without being disengaged from the grooves of the slits 615, 625.

The slits 615, 61 of the cam ring 61 are
In order to insert the locking end 41a and the locking claw 42a, 6 is opened toward the shoulder surface 617a as shown in FIG. The opening is provided with a curvature so that the locking end 41a and the locking claw 42a can be easily inserted. Therefore, when the belt member 40 is attached to the cam ring 61, the interlocking member can be attached while inserting the locking end 41a and the locking claw 42a into the slits 615 and 616, respectively, in the substantially optical axis direction.

Here. The rear lens barrels 31 and 32 are provided with holding plates 33 and 34, which are indicated by alternate long and short dash lines in FIG. 11, in order to lock the belt member 40 in the optical axis direction. In FIG. 11, the pressing plates 33 and 34 are located in front of (front of) the end faces 618 and 628 of the belt member 40 and the cam rings 61 and 62, and the support columns 317 provided on the rear lens barrels 31 and 32.
It is fixed by 327. The pressing plates 33 and 34 lock the belt member 40 to the rear lens barrels 31 and 32 in the optical axis direction.

Further, the cam rings 61, 62 have end faces 618,
628 is attached in a state of abutting on the pressing plates 33 and 34, and its position is regulated so as not to move in the optical axis direction. Thus, the belt member 40 and the cam rings 61, 62 are
Is regulated in the optical axis direction with respect to the rear barrels 31 and 32 by the holding plates 33 and 34.

As shown in FIG. 6, the cam rings 61, 6 are
The length T of the two winding portions 619 and 629 in the optical axis direction is set to be longer than the width of the belt member 40 from the end surfaces 618 and 628 by a predetermined margin. That is, the belt member 40 is wound around the winding portions 619 and 629 with a certain margin in the optical axis direction.

Here, as described above, the left and right front lens barrels 14,
When there is a deviation in the position of 15 in the optical axis direction, the positions of the left and right rear lens barrels 31 and 32 in the optical axis direction are respectively left and right front lens barrel 1.
Follow 4,15. At this time, if the belt member 40 is wound obliquely around the cam rings 61 and 62, the belt member 40 may hit the peripheral wall and may not be able to move smoothly. However, since the belt member 40 is wound around the optical axis with a certain allowance, even if the belt member 40 is skewed at the time of assembling the binoculars, the belt member 40
The skew can be eliminated by driving the drive several times.

Next, the driving operation of the belt member 40 by the variable power operation knob 50 will be described. As shown in FIG. 9, a sliding member 53 that slides on the sliding surface 55 of the rear frame 25 is interlocked with the scaling operation knob 50. Further, the fixed portion 43 of the belt member 40 is fixed to the slide member 53.

FIG. 13 is an exploded perspective view showing the operating portion including the variable power operating knob 50. The scaling operation knob 50 is rotatably held by a cylindrical portion 50 a provided on the rear frame 25. An arm 51 having a protrusion 52 at the lower end is formed to project from the variable power operation knob 50, and the protrusion 52 is slidably engaged with a vertically extending groove 54 formed in the slide member 53. There is.

A guide plate 56 is provided in front of the moving path of the slide member 53 to guide the sliding movement of the slide member 55. Therefore, when the variable power operation knob 50 is rotated, the slide member 53 moves to the guide surface 55.
Slide on top. Then, the movement of the slide member 53 causes the belt member 40 to move and the cam rings 61 and 62 to rotate, as shown in FIGS.

As described above, since the belt member 40 is made of a material which has flexibility and can transmit the force applied in both the pulling and pushing directions, the cam ring 61, 62 can be driven synchronously. Furthermore, since the belt member 40 itself is short in the optical axis direction, it is possible to make the binoculars 10 so compact.

Next, the focus adjusting mechanism and the diopter adjusting mechanism will be described. FIG. 14 is a plan view showing the binoculars 10 with a part cut away. As shown in FIG. 14, the binoculars 1
On the upper part of 0, the variable power operation knob 50, the focus adjustment knob 183, and the diopter difference adjustment knob 184 are arranged on the same axis. The binoculars of this embodiment are configured to move the first lenses 132 and 142 (FIG. 3), which are the frontmost lenses of the objective optical system, to perform focus adjustment and diopter adjustment.

FIG. 15 is an exploded perspective view showing a mechanism for moving the first lens frames 131, 141 holding the first lenses 132, 142 (FIG. 3). Focus adjustment knob 1
A first drive unit 181 is provided to convert the rotation of 83 into the axial movement of the first lens frames 131 and 141. A second drive unit 182 is provided to convert the rotation of the diopter difference adjustment knob 184 (FIG. 14) into the axial movement of the right first lens frame 131.

The first drive section 181 has a focus adjustment knob 18
3, a hollow threaded portion 181a that engages with an internal thread 183a formed inside the head 3, and a head portion 181b. Further, the head portion 181b includes a left arm 185 extending downward and engaging with the first lens frame 131,
A guide strip 191 extending in the axial direction is formed. Also,
The left arm 185 is formed with a slide portion 197 that guides the arm 185 in the axial direction.

The second drive section 182 is composed of a rod 182a penetrating the inside of the first drive section 181, and a head section 182c. Since the head portion 182c converts the rotation of the rod 182a into the axial movement, the head portion 18
A female screw 182d is formed on 2c, and the female screw 182d is formed.
The screw 182b formed at the tip of the rod 182a is engaged with d. The head portion 182c extends downward,
A right arm 186 that engages with the first lens frame 141 is formed. In addition, the right arm 186 includes the arm 18
A slide portion 198 for guiding 6 in the axial direction is formed.

Further, the diopter difference adjustment knob 184 (FIG. 14)
A drive shaft 187 is provided at the rear of the second drive unit in order to transmit the rotation of the second drive unit. The drive shaft 187 is
It is composed of a spline shaft 187a and a shaft portion 187b,
The spline shaft 187a is engaged with a spline groove 182e formed inside the rod 182a.

Spline groove 182e of second drive unit 182
Since the drive shaft 187 is engaged with the spline shaft 187a, even if the second drive unit 182 moves in the optical axis direction as the first drive unit 181 moves in the optical axis direction, The second driving unit 182 is interlocked with the rotation direction. The engagement relationship between the diopter difference adjustment knob 184 (FIG. 14) and the drive shaft 187 will be described later.

FIG. 16 shows the XV of the binoculars 10 in FIG.
It is an I-XVI sectional view. FIG. 6 is a cross-sectional view of the binoculars 10 showing an adjustment mechanism 180 and first lens barrels 132 and 142. The front frame 20 includes rails 192 for guiding the guide strips 191 of the first drive section in the axial direction, and left and right arms 18.
Rails 195 and 196 are formed for guiding the slide portions 197 and 198 of 5,186 in the axial direction.

The left and right arms 185, 186 are vertically regulated in position by position regulating members 193, 194 provided on the upper cover 180. A coil spring 190 is provided between the left and right arms 185 and 186 and the first lens frames 131 and 141, and the first lens frames 131 and 141 are urged downward by the coil spring 190, and the front lens barrel 13 , 14 in the vertical direction.

With such a configuration, when the focus adjustment knob 183 shown in FIG. 15 is rotated, the first drive portion 181 moves in the optical axis direction, and the left arm 185 and the right arm 186 move in the axial direction. To do. And both arms 18
By moving 5,186, the left and right first lens frames 13
1, 141 move in the optical axis direction, and focus adjustment is performed.

When the diopter adjustment knob 184 (FIG. 14) is rotated, the second drive section 18 is moved through the drive shaft 187.
Since the second screw portion 182b rotates and the head portion 182c moves in the optical axis direction, only the right arm 186 moves in the optical axis direction. That is, the right first lens frame 141 moves in the optical axis direction, and left and right diopter difference adjustment is performed.

As shown in FIG. 13, the drive shaft 187 driven by the diopter adjustment knob 184 passes through the inside of the columnar portion 50a holding the variable power operation knob 50, and the second front drive portion 182 is provided. (FIG. 15), the operations of the variable power operation knob 50 and the diopter difference adjustment knob 184 do not interfere with each other.

Here, the diopter adjustment knob 184 (FIG. 14)
When not in use, the zoom operation knob 5
It can be pushed into 0 and can be projected rearward (toward the observer) during use. A configuration for retracting the diopter difference adjustment knob 184 will be described.

As shown in FIG. 13, the diopter difference adjustment knob 1
84 is fixed to a cap portion 184b provided so as to engage with the drive shaft 187 in the rotational direction and be movable in the axial direction. A flat surface is formed on a shaft portion 187a of the drive shaft 187, and a cam groove 188 is provided on the flat surface. The cap portion 184b is provided with a locking spring 189 having one end engaged with the cam groove.

The shape and depth of the cam groove 188 are shown in FIG.
7 (A) and 7 (B). When the diopter adjustment knob 184 (FIG. 14) is pushed in once, the tip of the locking spring 189 moves along the cam groove 188 along the cam grooves 188.
8b, 188c, 188d in that order, and the locking spring 18
After the tip of 9 reaches the front end portion 188d of the cam groove 188,
When the pressure is released, the diopter adjustment knob 184 returns to the rear side by the action of the return spring 191 (FIG. 14), and the locking spring 1
It is locked when the tip of 89 reaches 188e.

When the diopter adjusting knob 184 (FIG. 14) is pushed in again, the tip of the locking spring 189 is 18 of the engaging groove 188.
When moving from 8e to 188f and then releasing the pressure,
188g, 18 by the action of the return spring 191 (Fig. 14)
It moves in the order of 8h and reaches 188a. That is, each time the diopter adjustment knob 184 is pushed in, the diopter adjustment knob 184 is locked alternately between the pushing position and the protruding position (operable position). Since the diopter adjustment knob 184 (FIG. 14) is located inside the variable power operation knob 50 (FIG. 14) in the pushed-in state, it can be prevented from being erroneously operated when not in use.

Next, a mechanism for finely adjusting the movement reference position of the lens for zooming will be described. 18 and 19
FIG. 4A is a perspective view and a side sectional view showing the rear side (observer side) of the right rear lens barrel 31. As shown in FIG. 18B, a pair of recesses 314 having a predetermined width are formed on the inner surface of the rear lens barrel 31.

When the cam ring 61 and the guide ring 71 are assembled to the rear lens barrel 31 as shown in FIG. 19, the sector flange portion 715 of the guide ring 71 is formed on the rear lens barrel 31 as shown in FIG. 18 (A). Engage with the recessed portion 314 formed. As a result, rough positioning of the guide ring 71 and the rear lens barrel 31 in the circumferential direction is performed.

The width H of the recess 314 in the circumferential direction is formed wider than the width of the sector flange 715 by a predetermined margin M (adjustment margin). An opening 315 is provided in the rear lens barrel 31 at a position corresponding to the sector gear 716.

Rotating the guide ring 71 in the rear barrel 31 in the circumferential direction (within the predetermined margin M) by operating the sector gear 716 through the opening 315 with a dedicated jig using a worm gear or the like. You can That is, the relative position of the guide ring 71 with respect to the cam 61 in the circumferential direction can be finely adjusted. As a result, the movement reference positions of the second and third lens frames 81 and 92 (FIG. 8) with respect to the rotation angle of the cam ring 61 can be adjusted.

Similarly, by finely adjusting the position of the right guide ring 72 in the circumferential direction, the movement reference of the second and third lens frames 82, 92 (FIG. 8) with respect to the rotation angle of the right cam ring 62. The position can be adjusted. That is, according to the binoculars 10 of the present embodiment, it is possible to independently adjust the movement reference positions of the second and third lenses.

On the outer periphery of the rear lens barrel 31, the eye contact ring 3 is attached.
7 is provided so as to be movable in the optical axis direction. A rubber eye 39 shown by a dotted line is attached to the eye ring 37. In addition, an opening 378 is formed in the eyepiece ring 37 at a position corresponding to the opening 315 of the rear lens barrel 31, and the opening 378 is covered by the eyepiece rubber 39. Thus, the sector gear 716 is prevented from being accidentally operated.

As shown in FIG. 19, the cam ring 61 and the guide ring 71 are fixed in the optical axis direction by attaching the fourth lens frame 35 for holding the fourth lens 114 to the rear lens barrel 31. . That is, after the cam ring 61 having the guide ring 71 inserted therein is fitted into the rear lens barrel 31, the screw portion 316 formed on the inner surface of the rear lens barrel 31 is engaged with the screw portion 351 of the fourth lens frame 35. Thus, the guide ring 71 and the cam ring 61 are fixed in the optical axis direction. That is, the fourth lens frame 35
Has a function of restricting the positions of the second and third lenses 112 and 113.

Next, the locking structure of the eye contact ring will be described. FIG. 20 is a perspective view showing the eyepiece ring 37 and the rear lens barrel 31. As shown in FIG. 20, the eyepiece ring 37 is fitted on the outer periphery of the rear lens barrel 31, and the screw portion 316 of the rear lens barrel 31 is engaged with the screw portion 351 of the eyepiece lens frame 35. As a result, the eyepiece ring 37 and the eyepiece frame 3
5 is fixed to the rear lens barrel 31. The eyepiece frame 35
Has a flange portion 353 having a diameter larger than that of the rear lens barrel 31, and serves as a stopper for preventing the eye contact ring 37 from coming off the rear lens barrel 31.

FIG. 21 is a side sectional view showing a structure for locking the eyepiece ring 37 to the rear barrel 31. In order to slidably engage the eyepiece ring 37 with the rear lens barrel 31, the eyepiece ring 37 is provided with convex portions 371 and 372 in parallel, and the rear lens barrel 31 is provided with three concave portions 321, 323, and 325. It is installed side by side. Further, as shown in FIG. 20, the concave portions 321 and 32
Between each of the portions 3 and 325, a concave portion is formed with respect to the outer peripheral surface of the rear lens barrel 31, and the concave portions 321 323, 325.
On the other hand, second concave portions 322 and 324 which are convex portions are formed.

FIG. 22 shows convex portions 371, 3 of the eyepiece ring 37.
72 is a plan view showing 72 and concave portions 321 to 325 of the rear barrel 31. FIG. The eyepiece ring 37 is shown as removed from the rear lens barrel 31. The recesses 321, 323, 325 and the second recesses 322, 324 are formed in a quadrangular shape having substantially the same length in the circumferential direction of the lens barrel. In addition, the eyepiece ring 37
21A, the projections 371, 3 have a size as shown in FIG.
72 and the recesses 323 and 325 are set so that they can be engaged with each other.

From the state shown in FIG. 21 (A), the eyepiece ring 37
When is pulled backward, the convex portions 371 and 372 slide over the second concave portions 322 and 324 due to the elastic deformation of the eyepiece ring 37. Then, as shown in FIG. 21B, the eyepiece ring 37 is locked to the rear lens barrel 31 with the convex portions 371 and 372 and the concave portions 321 and 323 engaged with each other. Then, in this state, one end of the convex portion 371 has one end of the eyepiece lens frame 35.
Abuts the flange portion 353. As described above, the outer diameter of the flange portion 353 is set so that the convex portion 371 cannot be overcome by elastic deformation. That is, the flange portion 353 serves as a stopper for preventing the eyepiece ring 37 from coming off.

The step between the second concave portions 322, 324 and the surface of the rear lens barrel 31 adjacent in the circumferential direction is the convex portion 3
Since the portions 31 and 332 are set so as not to be overcome, the concave portions 321, 323, 325 and the second concave portion 322,
The reference numeral 324 functions as a guide groove 320 that guides the convex portions 371 and 372 in the optical axis direction.

It is to be noted that, in the case of an observer who wears glasses, as shown in FIG. 21A, it is used with the eyepiece ring 37 pushed in, and in the case of an observer who does not wear glasses, FIG.
As shown in (B), the eyepiece ring 37 is used in a pulled-out state. When an observer wearing spectacles looks through the binoculars, the central portion of the spectacle lens is in a state of protruding toward the eyepiece lens frame 35. Then, as described above, the eyepiece lens frame 35
The end surface 352 facing the viewer has a radius of curvature R that prevents the viewer from wearing the glasses even if he or she looks through them.
It is formed as a concave surface having 2. In this embodiment,
The radius of curvature R1 of the eyepiece surface 352 is set to 100 mm.

FIG. 23 is a cross-sectional view showing the left eye contact rubber 39 shown by the dotted line in FIG. As shown in FIG. 23, the end face 39 on the rear side (right side in the figure) of the eye-contact rubber 39.
2 is formed with a predetermined curvature R3 from the center X which is separated from the optical axis 0 of the fourth lens 114 (not shown) by a predetermined distance T. Further, the right eye rubber is formed symmetrically with this. In this way, by shifting the center of curvature from the optical axis, the eyepiece rubber can sufficiently cover both eyes of the observer and prevent outside light from entering from the outside of the eye.

FIG. 24 is a side sectional view showing another example of the locking structure of the eye contact ring. As shown in FIG. 24A, convex portions 41 and 42 are formed on the outer periphery of the rear lens barrel 31, and openings 361, 362 and 363 are formed in the eyepiece ring 37.

FIG. 25 shows the openings 361 and 3 of the eyepiece ring 37.
62 and 363, and projections 341 and 34 on the outer periphery of the rear lens barrel 31.
It is a top view showing 2 and. The eyepiece ring 37 is shown as removed from the rear lens barrel 31. Openings 361, 362, 36
3 and the protrusions 341 and 342 respectively have a width and a length that are equal to the openings 36
Two of the 1, 362, 363 and the protrusions 341, 342
Can be engaged.

The openings 361, 362 and 363 are formed in the groove 360 extending in the axial direction. Also, eye ring 3
A step 367 in the axial direction is formed on the inner circumference of 7. Therefore, as shown in FIG.
The eyepiece ring 37 is locked to the rear barrel 31 with the openings 361 and 362 engaged with each other. When the eye contact ring 37 is pulled backward from this state, the openings 361 and 362 slide over the projections 341 and 342 due to the elastic deformation of the eye contact ring 37. Then, as shown in FIG. 22B, the eyepiece ring 37 is locked to the rear lens barrel 31 with the convex portions 341 and 342 and the openings 362 and 363 engaged with each other.

At this time, since the step portion 367 of the eye contact ring 37 contacts the flange portion 353 of the eyepiece lens frame 35, the eye contact ring 37 cannot slide further to the right in the figure. As a result, the stepped portion 367 serves as a stopper for preventing the eyepiece ring 37 from coming off. Further, the convex portions 341 and 342 are engaged with the groove 360 in the circumferential direction, and the groove 360 serves as a guide groove for guiding the convex portions 341 and 342 in the optical axis direction.

Finally, the correspondence between the characteristic portions of the present invention and the embodiments will be described. As shown in FIG. 19, according to the binoculars 10 of the present embodiment, the end surface of the lens frame 35 facing the viewer is formed as a concave surface having a curvature larger than that of the eyeglass (a radius of curvature R1 smaller than that of the eyeglass). Therefore, even if the observer wears spectacles, the spectacle lens is prevented from coming into contact with the lens frame 35. Further, since the lens frame 35 is formed with the mounting screw portion 351, a fixing member is not necessary. Further, by fixing the lens frame 35 to the rear lens barrel 31, the cam ring and the guide ring are simultaneously fixed in the optical axis direction, whereby the lens frames 81 and 92 can be positionally regulated in the optical axis direction.

[0099]

As described above, according to the lens frame of the present invention, the end surface of the lens frame facing the observer is formed as a concave surface having a curvature larger than that of the spectacles.
Even if the observer wears spectacles, the spectacle lens is prevented from coming into contact with the lens frame.

[Brief description of the drawings]

FIG. 1 is a perspective view showing variable power binoculars according to an embodiment.

FIG. 2 is an exploded perspective view of the binoculars of FIG.

FIG. 3 is a plan view showing an internal configuration of the binoculars of FIG.

FIG. 4 is a side sectional view of the binoculars of FIG.

FIG. 5 is an exploded perspective view of a rear unit.

FIG. 6 is a perspective view of a cam ring.

FIG. 7 is a side view and a perspective view of a guide ring.

FIG. 8 is a perspective view showing a cam ring, a guide ring, and second and third lens frames.

FIG. 10 is a front view and a perspective view of a belt member.

FIG. 11 is a front view showing a state in which a belt member is attached to the rear lens barrel.

FIG. 12 is a front view showing a state in which a belt member is attached to the rear lens barrel.

FIG. 13 is an exploded perspective view showing a mounting structure for a variable power operation knob.

FIG. 14 is a plan view showing a part of the binoculars by cutting away.

FIG. 15 is a perspective view showing a focus and diopter difference adjusting mechanism.

16 is a sectional view of the binoculars taken along the line segment XVI-XVI in FIG.

FIG. 17 is a plan view showing the shape of a cam groove and a schematic view showing the depth.

FIG. 18 is a perspective view showing the rear side of the rear lens barrel.

FIG. 19 is a side sectional view showing the rear side of the rear lens barrel.

FIG. 20 is a perspective view showing an eye contact mechanism.

FIG. 21 is a side sectional view showing an eye contact mechanism.

FIG. 22 is a plan view showing an eye contact mechanism.

FIG. 23 is a cross-sectional view of a rubber pad.

FIG. 24 is a side sectional view showing another example of the eye contact mechanism.

FIG. 25 is a plan view showing an eye contact mechanism.

[Explanation of symbols]

 10 Binoculars 13, 14 Front lens barrel 15, 16 Intermediate lens barrel 20 Objective side frame 25 Rear frame 31, 32 Rear lens barrel 35, 36 Fourth lens frame 37 Eye contact ring 40 Belt member 41 Locking end 42 Locking claw 50 Change Double operation knob 53 Slide member 61, 62 Cam ring 71, 72 Guide ring 81, 82 Second lens frame 91, 92 Third lens frame 100 Rear unit 112, 122 Second lens 113, 123 Third lens 132, 142 First Lens 114,124 4th lens 131,141 1st lens frame 181 1st drive part 182 2nd drive part 183 Focus adjustment knob 184 Diopter difference adjustment knob 200 Front unit 320 Groove 321,323,325 Recess 371,372 Convex part

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[Procedure amendment]

[Submission date] November 19, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a perspective view showing variable power binoculars according to an embodiment.

FIG. 2 is an exploded perspective view of the binoculars of FIG.

FIG. 3 is a plan view showing an internal configuration of the binoculars of FIG.

FIG. 4 is a side sectional view of the binoculars of FIG.

FIG. 5 is an exploded perspective view of a rear unit.

FIG. 6 is a perspective view of a cam ring.

FIG. 7 is a side view and a perspective view of a guide ring.

FIG. 8 is a perspective view showing a cam ring, a guide ring, and second and third lens frames.

FIG. 9 is a perspective view showing a rear unit.

FIG. 10 is a front view and a perspective view of a belt member.

FIG. 11 is a front view showing a state in which a belt member is attached to the rear lens barrel.

FIG. 12 is a front view showing a state in which a belt member is attached to the rear lens barrel.

FIG. 13 is an exploded perspective view showing a mounting structure for a variable power operation knob.

FIG. 14 is a plan view showing a part of the binoculars by cutting away.

FIG. 15 is a perspective view showing a focus and diopter difference adjusting mechanism.

16 is a sectional view of the binoculars taken along the line segment XVI-XVI in FIG.

FIG. 17 is a plan view showing the shape of a cam groove and a schematic view showing the depth.

FIG. 18 is a perspective view showing the rear side of the rear lens barrel.

FIG. 19 is a side sectional view showing the rear side of the rear lens barrel.

FIG. 20 is a perspective view showing an eye contact mechanism.

FIG. 21 is a side sectional view showing an eye contact mechanism.

FIG. 22 is a plan view showing an eye contact mechanism.

FIG. 23 is a cross-sectional view of a rubber pad.

FIG. 24 is a side sectional view showing another example of the eye contact mechanism.

FIG. 25 is a plan view showing an eye contact mechanism.

[Explanation of Codes] 10 Binoculars 13, 14 Front lens barrel 15, 16 Intermediate lens barrel 20 Objective side frame 25 Rear frame 31, 32 Rear lens barrel 35, 36 Fourth lens frame 37 Eye contact ring 40 Belt member 41 Locking end 42 Locking claw 50 Variable magnification operation knob 53 Slide member 61, 62 Cam ring 71, 72 Guide ring 81, 82 Second lens frame 91, 92 Third lens frame 100 Rear unit 112, 122 Second lens 113, 123 Third lens 132,142 1st lens 114,124 4th lens 131,141 1st lens frame 181 1st drive part 182 2nd drive part 183 Focus adjustment knob 184 Diopter difference adjustment knob 200 Front unit 320 Groove 321,323,325 Concave 371,372 convex

Claims (5)

[Claims] 1. A lens frame for binoculars, which holds the lens closest to the observer and has an end face facing the observer formed as a concave surface having a predetermined curvature. 2. The lens frame for binoculars according to claim 1, wherein the predetermined curvature is larger than the curvature of the lens of the spectacles. 3. A threaded portion is formed on the lens frame, and the lens frame is attached to the lens barrel by screwing the threaded portion onto the threaded portion formed on the barrel of each telescopic optical system. It is fixed, The lens frame of the binoculars according to claim 1 or 2. 4. The other lens forming the eyepiece optical system is positioned in the optical axis direction with respect to the lens barrel of the telescopic optical system by fixing the lens frame to the lens barrel. The lens frame of the binoculars according to claim 3. 5. An eyepiece movable in the optical axis direction is fitted to an eyepiece portion of the barrel of the telescopic optical system, and at least a part of the lens frame is formed larger than an outer shape of the eyepiece portion. The lens frame for binoculars according to claim 4, wherein the lens frame prevents the eyepiece ring from falling off the lens barrel.