JP3665431B2 - Lens holding structure - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to a holding structure for holding a lens in binoculars.
[0002]
[Prior art]
In general, in binoculars, the range of the field of view obtained by the left and right telephoto optical systems, that is, the range limited by the field frame needs to be the same on the left and right.
[0003]
[Problems to be solved by the invention]
However, when the left and right visual field ranges differ due to errors in assembling the lens into the lens frame and processing shape errors, there is a problem that the lens frame must be replaced and parts are wasted.
[0004]
In view of the circumstances as described above, it is an object of the present invention to provide binoculars capable of adjusting the left and right visual fields without exchanging the lens frame.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the lens holding structure of the present invention is configured so that the predetermined lenses of the left and right telephoto optical systems are moved in the optical axis direction by the relative rotation of the cam rings and the guide rings provided in the left and right telephoto optical systems. In the variable power binoculars that move to, the mounting direction in the circumferential direction with respect to the guide ring of the lens frame that holds the lens can be changed. Further, in a variable power binocular that performs zooming by moving predetermined lenses of the left and right telephoto optical systems in the optical axis direction, a lens frame that holds the lens, and a cam ring in which a cam of a predetermined shape is formed, A guide ring in which a plurality of guide grooves extending in the optical axis direction are formed at equal intervals in the circumferential direction. The lens frame has a cam follower that engages with the cam and a plurality of guide grooves that respectively engage with the guide grooves. Guide protrusions may be provided, the plurality of guide grooves may have the same shape, the guide strips may all have the same shape, and the mounting position of the lens frame with respect to the guide ring may be changed.
[0006]
Further, either one of the cam ring and the guide ring can be fixed to the binocular main body and the other can be rotated. Further, the cam ring and the guide ring may be fixed to the binocular main body, and the cam ring and the guide ring may be rotationally driven by the cam ring. In addition, a guide groove extending in the optical axis direction of the lens is formed on the inner peripheral surface of the guide ring, and a guide strip that slidably engages with the guide groove is formed on the lens frame. Is formed with a long hole extending through the cam follower extending in the optical axis direction of the lens, and the cam follower may be configured to engage with a cam formed in the cam ring through the long hole. Further, the guide grooves and the guide strips can be formed at intervals of 90 ° in the circumferential direction on the guide ring and the lens frame, respectively.
[0007]
Embodiment
Hereinafter, embodiments of the present invention will be described 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 telephoto optical systems 10 </ b> L and 10 </ b> R and a front frame 20. Further, a focus adjustment knob 183, a diopter difference adjustment knob 184, and a zooming operation knob 50 are arranged side by side on the binoculars 10. In the following description, the subject side is referred to as “front”, and the observer side is referred to as “rear”.
[0008]
FIG. 2 is an exploded perspective view of the binoculars 10 of FIG.
As shown in FIG. 2, the telephoto optical system 10L (10R) includes a front lens barrel 13 (14), an intermediate lens barrel 15 (16), and a rear lens barrel 31 (32). The front lens barrel 13 (14) is rotatably supported by fitting with a pair of left and right bores 201 (202) provided in the front frame 20. An intermediate lens barrel 15 (16) is fixed behind the front lens barrel 13 (14), and a rear lens barrel 31 (32) is fixed behind the intermediate lens barrel 15 (16).
[0009]
The rear barrel 31 (32) is arranged such that the central axis is decentered by a predetermined amount with respect to the front barrel 13 (14). In addition, the rear lens barrel 31 (32) is supported by the rear frame 25 so that the rear lens barrel 31 (32) can swing as the front lens barrel 13 (14) rotates.
[0010]
FIG. 3 is a plan view showing the internal configuration of the binoculars 10. As shown in FIG. 3, the front lens barrel 13 (14) accommodates the first lens 132 (142). The first lens 132 (142) is held by the first lens frame 131 (141), and the first lens frame 131 (141) is supported movably in the front lens barrel 13 (14).
[0011]
The intermediate lens barrel 15 (16) is provided with two prisms 151, 152 (161, 162). Both prisms 151 and 152 (161, 162) are arranged so that their ridges are perpendicular to each other, forming a so-called poro prism erect system. As a result, the inverted image transmitted through the first lens 132 (142) is inverted and becomes erect.
[0012]
The rear lens barrel 31 (32) accommodates the second lens 112 (122) and the third lens 113 (123). The second lens 112 (122) and the third lens 113 (123) are held by the second and third lens frames 81 and 91 (82 and 92), respectively. The second and third lens frames 81 and 91 (82 and 92) are movably provided by the rear lens barrel 31 (32).
[0013]
The first lens 132 (142) and the second lens 112 (122) constitute an objective optical system, and the third lens 113 (123) and the fourth lens 114 (124) constitute an eyepiece optical system. A field ring 17b (18b) for defining the field of view is provided at a position where an image is formed by the objective optical system.
[0014]
In the following description, when simply referred to as “optical axis direction”, it is parallel to the optical axis of the first lens 132 (142) and the optical axis of the second lens 112 (122) to the fourth lens 114 (124). Point in the right direction.
[0015]
The binoculars 10 of the present embodiment move 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, in the optical axis direction. Is configured to perform zooming.
[0016]
FIG. 4 is a side sectional view of the binoculars 10 showing the moving range of the second and third lenses 112 and 113. In FIG. 4, the positions of the 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.
[0017]
In FIG. 2, the front frame 20, the front lens barrels 13 and 14 and the intermediate lens barrels 15 and 16 form a front unit 200, and the rear frame 25 and the rear lens 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.
[0018]
A shoulder portion 133 (143) is formed on the outer periphery of the front lens barrel 13 (14), and the shoulder portion 133 (143) contacts the inner edge portion of the bore 201 (202). Thereby, the axial positioning with respect to the front frame 25 of the front lens barrel 13 (14) is performed.
The rear lens barrel 31 (32) has an end surface 31a (32a) that comes into contact with the rear end surface 15a (16a) of the intermediate lens barrel 15 (16), and the rear mirror with respect to the intermediate lens barrel 15 (16) is brought into contact therewith. The cylinder 31 (32) is positioned in the axial direction.
[0019]
A positioning pin 31b (32b) is formed on the end surface 31a (32a) of the rear frame 31 (32), and the positioning pin 31b (32b) is a rear end surface 15a (16a) of the intermediate lens barrel 15 (16). Is inserted into the hole 15b (16b). Thus, positioning of the rear frame 31 (32) in the plane perpendicular to the axial direction with respect to the intermediate lens barrel 15 (16) is performed.
[0020]
Further, guide bars 311 and 312 extending toward the front frame 20 are formed on the rear frames 31 and 32 so as to protrude. Holes 153 and 163 with which the guide bars 311 and 312 are engaged are formed at the rear end of the front frame 200, and serve as a guide when the rear frame 100 is assembled to the front frame 200.
[0021]
Further, on the outer peripheries of the intermediate lens barrels 15 and 16 that are opposed to each other, the intermediate lens barrels 15 and 16 (and the rear lens barrels 31 and 32 attached to the rear thereof) are engaged with each other so as to swing together. Sector gears 154 and 164 are formed.
[0022]
FIG. 5 is an exploded perspective view of the rear unit 100. On the rear end surfaces of the rear barrels 31 and 32, the pivot shafts 321 and 322 (indicated by dotted lines in the figure) are located at the pivot centers of the intermediate barrels 15 and 16, that is, the positions corresponding to the optical axes of the first lenses 13 and 14. (Shown) is formed to protrude rearward.
[0023]
The rear frame 25 is formed with through holes 251 and 252 through which the swinging shafts 321 and 322 of the rear lens barrels 31 and 32 pass, respectively. Screw holes 321a and 322a are formed at the ends of the swing shafts 321 and 322, respectively.
Then, the swinging shafts 321 and 322 are passed through the through holes 251 and 252 of the rear frame 25, and the screws 321b and 322b are fixed to the screw holes 321a and 322a of the swinging shafts 321 and 322. 32 is swingably supported by the rear frame 25.
[0024]
Thus, 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 rear unit 100 is assembled as a single unit by fitting the swinging shafts 321 and 322 of the left and right rear barrels 31 and 32 into the holes 251 and 252 of the rear frame 25 and fixing them. That is, the front unit 200 and the rear unit 100 can be assembled and stored in advance, and the binoculars 10 are obtained by assembling the rear unit 100 to the front unit 200 at the time of assembly.
[0025]
Here, as shown in FIG. 2, only the first lenses 132 and 142 belong to the front unit 200 among the left and right telephoto optical systems 10L and 10R, and the second lenses 112 and 122 and the third lens 113 are included. , 123 and the fourth lenses 114, 124 (both in FIG. 3) belong to the rear unit 100. Therefore, in the present embodiment, even when the positions of the front lens barrels 13 and 14 in the optical axis direction are displaced, when the rear unit 100 is assembled to the front unit 200, the first lenses 132 and 142 belonging to the front unit 200 The distance from the second lenses 112 and 122 (FIG. 3) belonging to the rear unit 100 is the same on the left and right.
[0026]
That is, in FIG. 5, the lengths of the swinging shafts 321 and 322 are set so that the rear barrels 31 and 32 are held with a predetermined amount of margin in the optical axis direction with respect to the rear frame 25. Yes. 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 follow the positions of the intermediate lens barrels 15 and 16 in the optical axis direction, respectively. Thus, the distance between the first lenses 132 and 142 and the second lenses 112 and 122 (FIG. 3) is the same on the left and right.
[0027]
Next, a mechanism for moving and driving the second lenses 112 and 122 and the third lenses 113 and 123 (FIG. 3) in the optical axis direction in the rear barrels 31 and 32 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. Guide rings 71 and 72 for holding the second lenses 112 and 122 and the third lenses 113 and 123 movably in the optical axis direction are inserted.
[0028]
FIG. 6 is a perspective view of the left cam ring 61. As shown in FIG. 6, the cam ring 61 includes a cylindrical portion 612, an arc-shaped wall 617 formed on one end surface of the cylindrical portion 612, and an extending wall 611 extending from the axial end surface of the arc-shaped wall 617. It has become more.
The arc-shaped wall 617 and the extending wall 611 form an arc along the outer peripheral surface of the cylindrical portion 612. Further, the outer diameter (from the center of the arc) of the extending wall 611 is smaller than the arc-shaped wall 617 by a predetermined amount, and a shoulder surface 617a is formed on the end surface of the arc-shaped wall 612.
[0029]
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 part 619 is set slightly smaller than the other part of the cylindrical part 612. Thereby, a clearance C shown in FIG. 3 is formed between the outer surface of the winding part 619 and the inner surface of the rear barrel 31.
[0030]
In addition, two parallel slits 615 and 616 are formed in the winding portion 619 to lock a belt member described later. The slits 615 and 616 further extend to the shoulder surface 617a of the arcuate wall 617.
[0031]
A first cam groove 613 for moving the second lens 112 is formed in the extending wall 611. In addition, two second cam grooves 614 and 614 for moving the third lens 122 are formed in the cylindrical portion 612.
[0032]
7A and 7B are a perspective view and a side sectional view showing the left guide ring 71, respectively. The guide ring 71 includes a cylindrical portion 712, an arc-shaped 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 flange portion 715 is formed with a pair of outer peripheral gears 716 for finely adjusting (described later) the position of the guide ring 71.
[0033]
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. A long hole 713 extending along the groove is formed in the central guide groove 717 among the three. Further, four guide grooves 718 extending in the axial direction are formed on the inner surface of the cylindrical portion 712 at 90 ° intervals in the circumferential direction, and two of the four guide grooves 718 facing each other are formed along the grooves. An elongated hole 714 is formed.
[0034]
FIG. 8 is an exploded perspective view showing the left and right cam rings 61 and 62, guide rings 71 and 72, second lens frames 81 and 82, and third lens frames 91 and 92. As shown in FIG. 8, the guide rings 71 and 72 are configured symmetrically, and the cam rings 61 and 62 are configured similarly.
[0035]
As shown in FIG. 8, on the outer periphery of the second lens frame 81 (82), four sliders 811 (821) extending in the axial direction are formed at intervals of 90 ° in the circumferential direction. The slider 811 (812) is formed with a screw hole 812 (822), and the cam follower 813 (823) can be screwed. Similarly, four sliders 911 (921) extending in the axial direction are formed on the outer periphery of the third lens frame 91 (92) at intervals of 90 ° in the circumferential direction. The slider 911 (921) is formed with a screw hole 912 (922), and the cam follower 913 (923) can be screwed therein.
[0036]
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 so as to be slidable in the optical axis direction. 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 held by the guide ring 71 so as to be slidable in the optical axis direction. The
[0037]
Of the four sliders 811 of the second lens frame 81, only one engages with the guide groove 717 (FIG. 7) in which the long hole 713 (FIG. 7) is formed. A cam follower 813 is fixed to the screw hole 812 of the single slider 811, and the cam follower 813 passes through the long hole 713 (FIG. 7) and engages with the cam groove 613 of the cam ring 61.
[0038]
Similarly, the cam follower 913 is fixed to the screw hole 912 of the slider 911 engaged with the guide groove 718 (FIG. 7) in which the long hole 714 is formed among the four sliders 911, and the cam follower 913 defines the long hole 714. It penetrates and engages with the cam groove 614 of the cam ring 61.
[0039]
With this configuration, when the cam ring 61 rotates, the cam follower 813 of the second lens frame 81 and the cam follower 913 of the third lens frame 91 slide along the cam grooves 613 and 614 of the cam ring 61. At the same time, the slider 811 of the second lens frame 81 and the slider 911 of the third lens frame 91 slide along the guide grooves 717 and 718 of the guide ring 71. That is, the second and third lens frames 81 and 91 on the left side move in the guide ring 71 in the axial direction by the rotation of the cam ring 61. Similarly, the second and third lens frames 82 and 92 on the right side move in the guide ring 72 in the axial direction by the rotation of the cam ring 62.
[0040]
Here, the diameters of the cam followers 813 and 913 are set smaller than the widths of the long holes 713 (FIG. 7) and 714 by a predetermined amount. Therefore, the cam followers 813 and 913 do not contact the side surfaces of the long holes 713 and 714 when the guide grooves 717 (FIG. 7) and 718 are engaged with the sliders 811 and 911, respectively. That is, the second and third lens frames are separately provided with a portion in contact with the cam groove and a portion in contact with the guide groove. Further, since the sliders 811 and 911 also serve as reinforcing members for the lens frames 81 and 91 themselves, the lens frames 81 and 91 are prevented from being damaged when an excessive force is applied to the rotation of the cam ring 61.
[0041]
In this embodiment, the guide rings 71 and 72 are fixed and the cam rings 61 and 62 are rotated. However, the cam rings 61 and 62 can be fixed and the guide rings can be rotated. It is.
[0042]
Here, since the sliders 811 and 911 and the guide grooves 717 and 718 (FIG. 7) are formed at equal intervals, the left and second lens frames 81 and 91 on the left side with respect to the guide ring 71 (in the circumferential direction). The mounting angle can be changed at intervals of 90 ° in the circumferential direction. Similarly, the mounting angles (in the circumferential direction) of the right and second lens frames 82 and 92 on the right side with respect to the guide ring 72 can be changed at 90 ° intervals in the circumferential direction.
[0043]
Therefore, after the binoculars 10 are assembled, if a so-called field misalignment phenomenon occurs in which the field of view range (the range limited by the field frame) differs on the left and right due to lens assembly errors, etc., the left and right second lenses By changing the mounting direction of the frames 81 and 82 or the third lens frames 91 and 92 to the guide rings 71 and 72, the left and right visual fields can be corrected.
[0044]
Next, a configuration for rotationally driving the left and right cam rings 61 and 62 in conjunction with each other will be described.
FIG. 9 is a perspective view showing the rear unit 100. The rear barrels 31 and 32 are indicated by dotted lines. As shown in FIG. 9A, the rear unit 100 is provided with a belt member 40 (an interlocking member) for interlocking the left and right cam rings 61 and 62. The belt member 40 is wound along winding portions 619 (FIG. 6) and 629 formed on the cam rings 61 and 62. The rear frame 25 is provided with a zooming operation knob 50 for driving the belt member 40.
[0045]
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 curvature radius R1. The curvature radius R1 is set in the same manner 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 that has sufficient flexibility to be wound around the cam rings 61 and 62 and has toughness that can transmit a load caused by “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.
[0046]
Both ends of the belt member 40 are bent toward the virtual center of the radius of curvature R1 to form a locking end 41. Further, a locking claw 42 is provided that is formed by cutting a substantially square portion leaving one side at a predetermined interval from the locking end 41 and bending it at the one side. The interval between the locking end 41 and the locking claw 42 will be described later.
In addition, a connecting portion 43 for driving the belt member 40 is formed at the longitudinal center of the belt member 40.
[0047]
FIG. 11 is a front view of the belt member 40 and the rear lens barrels 31 and 32 as viewed from the front. The guide rings 71 and 72 and the lens frames are omitted. As shown in FIG. 11, one locking end 41a and the locking claw 42a of the belt member 40 are engaged with slits 615 and 616 formed in the left cam ring 61, and are engaged with the other locking end 41b. The pawl 42 b is engaged with slits 625 and 626 formed in the right cam ring 62.
[0048]
The clearance C (FIG. 3) for passing the belt member 40 is provided between the winding portions 619 and 629 of the cam rings 61 and 62 and the inner surfaces of the rear barrels 31 and 32. The rear barrels 31 and 32 are provided with pressing roller groups 313 and 323 each including four rollers for guiding the belt member 40 between the winding portions 619 and 629.
[0049]
In order to hold the belt member 40 at the center of swinging (when adjusting the eye width), the left and right rear barrels 31 and 32 are provided with first support roller pairs 314 and 324, respectively. The first support roller pair 314, 324 is arranged so that the middle 314a, 324a of each roller pair corresponds to the above-described swing center (swing shaft 321, 322 in FIG. 5).
[0050]
In addition, second support roller pairs 315 and 325 are provided adjacent to the first support roller pair 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 surfaces of the rear lens barrels 31, 32. 3) and the clearances between the winding portions 619 and 629 and the presser roller groups 313 and 323 are set slightly larger.
[0051]
With this configuration, when the belt member 40 is driven, for example, in the left direction (right direction in FIG. 11) as viewed from the observer by an operation member described later, the belt member 40 pushes the left cam ring 61. While rotating clockwise in the figure, the right cam ring 62 is pulled and rotated clockwise in the figure. In this way, the left and right cam rings 61 and 62 are rotated by the belt member 40 in conjunction with each other.
[0052]
When the rear lens barrels 31 and 32 swing as shown in FIGS. 11 and 12, the belt member 40 is gently bent around the portions 314a and 324a corresponding to the swing shafts of the rear lens barrels 31 and 32. . At this time, the swinging of the rear barrels 31 and 32 does not cause the belt member 40 to rotate the cam rings 61 and 62.
[0053]
Since the sliding contact portion 44 corresponding to a portion outside the bent corner of the locking end 41 of the belt member 40 has a predetermined curvature, when the belt member 40 is moved, the sliding contact portion 44 is moved to the rear. Without being caught by the inner surfaces of the lens barrels 31 and 32, the sliding movement is smoothly performed along the inner surfaces of the rear lens barrels 31 and 32.
[0054]
Here, the interval between the locking end 41 and the locking claw 42 of the belt member 40 is set to be a predetermined amount shorter than the interval between the slit 615 and the slit 616 and the interval between the slit 625 and the slit 626. Further, when the belt member 40 is wound around the cam rings 61 and 62, as shown in FIG. 10B, the locking ends 41 and the locking claws 42 are narrowed.
[0055]
Therefore, when one locking end 41 and the locking claw 42 of the belt member 40 are engaged with the slits 615 and 616 and the other locking end 41 and the locking claw 42 are engaged with the slits 625 and 626, What is sandwiched between the stop end 41 and the locking claw 42 is clamped. Therefore, the locking ends 41 and 41 are securely locked to the cam rings 61 and 62 without being disengaged from the grooves of the slits 615 and 625.
[0056]
The slits 615 and 616 of the cam ring 61 are opened toward the shoulder surface 617a as shown in FIG. 6 in order to insert the locking end 41a and the locking claw 42a, respectively. In addition, the opening has a curvature so that the locking end 41a and the locking claw 42a can be easily inserted. Therefore, when attaching the belt member 40 to the cam ring 61, it is possible to attach the interlocking member while inserting the locking end 41a and the locking claw 42a into the slits 615 and 616 in the substantially optical axis direction.
[0057]
here. The rear lens barrels 31 and 32 are provided with presser plates 33 and 34 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 holding plates 33 and 34 are positioned in front (front) of the end surfaces 618 and 628 of the belt member 40 and the cam rings 61 and 62, and support columns 317 and 327 provided on the rear lens barrels 31 and 32. It is fixed by. The presser plates 33 and 34 lock the belt member 40 with respect to the rear barrels 31 and 32 in the optical axis direction.
[0058]
The cam rings 61 and 62 are attached in a state where the end faces 618 and 628 are in contact with the presser plates 33 and 34, and their positions are restricted so as not to move in the optical axis direction. Thus, the position of the belt member 40 and the cam rings 61 and 62 is restricted in the optical axis direction with respect to the rear barrels 31 and 32 by the presser plates 33 and 34.
[0059]
As shown in FIG. 6, the length T in the optical axis direction of the winding portions 619 and 629 of the cam rings 61 and 62 is set longer than the width of the belt member 40 from the end surfaces 618 and 628 by a predetermined margin. Has been. That is, the belt member 40 is wound around the winding portions 619 and 629 with a predetermined margin in the optical axis direction.
[0060]
Here, as described above, when the positions of the left and right front lens barrels 14 and 15 are displaced 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 the left and right front lens barrels. Follow 14 and 15. At this time, if the belt member 40 is wound around the cam rings 61 and 62 in a slanted manner, the belt member 40 may hit a peripheral wall and be unable to move smoothly. However, since the belt member 40 is wound with a predetermined margin in the optical axis direction, even if the belt member 40 is skewed when the binoculars are assembled, the belt member 40 is driven several times to perform skewing. Can be resolved.
[0061]
Next, the driving operation of the belt member 40 by the zoom 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 zooming operation knob 50. Further, the fixing portion 43 of the belt member 40 is fixed to the slide member 53.
[0062]
FIG. 13 is an exploded perspective view showing the operation unit including the zooming operation knob 50. The zooming operation knob 50 is rotatably held by a cylindrical portion 50a provided in the rear frame 25. In addition, an arm 51 having a projection 52 at the lower end is formed to protrude from the zooming control knob 50, and the projection 52 is slidably engaged with a groove 54 formed in the slide member 53 extending in the vertical direction. Yes.
[0063]
A guide plate 56 is provided in front of the movement path of the slide member 53 in order to guide the slide of the slide member 55. Therefore, when the zoom operation knob 50 is rotated, the slide member 53 slides on the guide surface 55. As the slide member 53 moves, the belt member 40 moves as shown in FIGS. 9A and 9B, and the cam rings 61 and 62 rotate.
[0064]
In this way, the belt member 40 is formed of a material that is flexible and can transmit the force applied in both the pulling and pushing directions, so that the cam rings 61 and 62 can be synchronized with a simple configuration. Can be driven. Furthermore, since the belt member 40 itself is short in the optical axis direction, the binoculars 10 can be made more compact.
[0065]
Next, the focus adjustment mechanism and the diopter adjustment mechanism will be described.
FIG. 14 is a plan view showing the binoculars 10 with a part cut away. As shown in FIG. 14, a zoom operation knob 50, a focus adjustment knob 183, and a diopter difference adjustment knob 184 are arranged on the same axis above the binoculars 10. The binoculars of the present embodiment are configured to move the first lenses 132 and 142 (FIG. 3), which is the foremost lens of the objective optical system, to perform focus adjustment and diopter difference adjustment.
[0066]
FIG. 15 is an exploded perspective view showing a mechanism for moving the first lens frames 131 and 141 that hold the first lenses 132 and 142 (FIG. 3).
A first drive unit 181 is provided to convert the rotation of the focus adjustment knob 183 into an axial movement of the first lens frames 131 and 141. Further, 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.
[0067]
The first drive unit 181 includes a hollow screw part 181a that engages with a female screw 183a formed inside the focus adjustment knob 183, and a head part 181b. The head portion 181b is formed with a left arm 185 that extends downward and engages the first lens frame 131, and a guide strip 191 that extends in the axial direction. The left arm 185 is formed with a slide portion 197 for guiding the arm 185 in the axial direction.
[0068]
The second driving unit 182 includes a rod 182a penetrating the inside of the first driving unit 181 and a head unit 182c. Since the head portion 182c converts the rotation of the rod 182a into axial movement, a female screw 182d is formed in the head portion 182c, and a screw 182b formed at the tip of the rod 182a is engaged with the female screw 182d. A right arm 186 that extends downward and engages with the first lens frame 141 is formed on the head portion 182c. The right arm 186 is formed with a slide portion 198 that guides the arm 186 in the axial direction.
[0069]
In addition, a drive shaft 187 is provided behind the second drive unit in order to transmit the rotation of the diopter difference adjustment knob 184 (FIG. 14) to the second drive unit. The drive shaft 187 includes a spline shaft 187a and a shaft portion 187b. The spline shaft 187a is engaged with a spline groove 182e formed in the rod 182a.
[0070]
Due to the engagement between the spline groove 182e of the second drive unit 182 and the spline shaft 187a of the drive shaft 187, the second drive unit 182 moves in the optical axis direction as the first drive unit 181 moves in the optical axis direction. Even so, the drive shaft 187 and the second drive unit 182 are linked in the rotational direction. The engagement relationship between the diopter difference adjustment knob 184 (FIG. 14) and the drive shaft 187 will be described later.
[0071]
16 is an XVI-XVI cross-sectional view of the binoculars 10 in FIG. 2 is a cross-sectional view of binoculars 10 showing an adjustment mechanism 180 and first lens barrels 132 and 142. FIG. The front frame 20 includes a rail 192 for guiding the guide strip 191 of the first drive unit in the axial direction, and rails 195 and 196 for guiding the slide portions 197 and 198 of the left and right arms 185 and 186 in the axial direction. Is formed.
[0072]
The left and right arms 185 and 186 are position restricted in the vertical direction by position restriction members 193 and 194 provided on the upper cover 180. In addition, a coil spring 190 is provided between the left and right arms 185 and 186 and the first lens frame 131 and 141, and the first lens frame 131 and 141 is urged downward by the coil spring 190, and the front lens barrel 13. , 14 are regulated in the vertical direction.
[0073]
With this configuration, when the focus adjustment knob 183 shown in FIG. 15 is rotated, the first drive unit 181 moves in the optical axis direction, and the left arm 185 and the right arm 186 move in the axial direction. As the arms 185 and 186 move, the left and right first lens frames 131 and 141 move in the optical axis direction, and focus adjustment is performed.
[0074]
Further, when the diopter adjustment knob 184 (FIG. 14) is rotated, the screw portion 182b of the second drive portion 182 is rotated via the drive shaft 187, and the head portion 182c moves in the optical axis direction. Only 186 moves in the direction of the optical axis. That is, the right first lens frame 141 moves in the optical axis direction, and the diopter difference adjustment between the left and right is performed.
[0075]
As shown in FIG. 13, the drive shaft 187 driven by the diopter adjustment knob 184 passes through the inside of the columnar part 50a that holds the zoom operation knob 50, and the second drive part 182 on the front side (FIG. 15). ), The operations of the zooming operation knob 50 and the diopter difference adjustment knob 184 do not interfere with each other.
[0076]
Here, the diopter adjustment knob 184 (FIG. 14) can be pushed into the zoom operation knob 50 to prevent erroneous operation when not in use, and can project backward (observer side) when in use. Yes. A configuration for retracting the diopter difference adjustment knob 184 will be described.
[0077]
As shown in FIG. 13, the diopter difference adjusting knob 184 is fixed to a cap portion 184b that is engaged with the drive shaft 187 in the rotational direction and is movable in the axial direction. A flat surface is formed on the 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.
[0078]
The shape and depth of the cam groove 188 are set as shown in FIGS. 17A and 17B, respectively. 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 in the order of 188a, 188b, 188c, 188d, and the tip of the locking spring 189 is in the cam groove 188. When the pressure is released after reaching the front end 188d, the diopter adjustment knob 184 returns to the rear side by the action of the return spring 191 (FIG. 14), and is locked when the tip of the locking spring 189 reaches 188e. .
[0079]
When the diopter adjustment knob 184 (FIG. 14) is pushed in again, the tip of the locking spring 189 moves from 188e to 188f of the engagement groove 188, and when the pressure is released thereafter, the return spring 191 (FIG. 14) acts to provide 188g. , 188h to reach 188a. That is, every time the diopter adjustment knob 184 is pushed, the diopter adjustment knob 184 is alternately locked between the pushed position and the protruding position (operable position).
Since the diopter adjustment knob 184 (FIG. 14) is located inside the zoom operation knob 50 (FIG. 14) when pushed, it can be prevented from being operated erroneously when not in use.
[0080]
Next, a mechanism for finely adjusting the movement reference position of the lens for zooming will be described.
18 and 19 are a perspective view and a side sectional view showing the rear side (observer side) of the right rear barrel 31. FIG. As shown in FIG. 18B, a pair of recesses 314 having a predetermined width are formed on the inner surface of the rear barrel 31.
[0081]
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 in the recess formed in the rear lens barrel 31 as shown in FIG. 314 is engaged. Thereby, the rough positioning of the circumferential direction with respect to the guide ring 71 and the rear lens barrel 31 is achieved.
[0082]
The width H in the circumferential direction of the recess 314 is wider than the width of the sector flange 715 by a predetermined margin M (adjustment margin). An opening 315 is provided at a position of the rear barrel 31 corresponding to the sector gear 716.
[0083]
By operating the sector gear 716 from the opening 315 with a dedicated jig using a worm gear or the like, the guide ring 71 can be rotated in the circumferential direction (within the predetermined margin M) within the rear barrel 31. That is, the circumferential relative position of the guide ring 71 with respect to the cam 61 can be finely adjusted. Thereby, the movement reference position 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.
[0084]
Similarly, the movement reference position of the second and third lens frames 82 and 92 (FIG. 8) with respect to the rotation angle of the right cam ring 62 is adjusted by finely adjusting the circumferential position of the right guide ring 72. can do. That is, according to the binoculars 10 of this embodiment, the movement reference positions of the second and third lenses can be adjusted independently on the left and right.
[0085]
An eye ring 37 is provided on the outer periphery of the rear barrel 31 so as to be movable in the optical axis direction. An eye rubber 39 indicated by a dotted line is attached to the eye ring 37. An opening 378 is formed in the eye ring 37 at a position corresponding to the opening 315 of the rear lens barrel 31, and the opening 378 is covered with the eye rubber 39. Thus, erroneous operation of the sector gear 716 is prevented.
[0086]
As shown in FIG. 19, the cam ring 61 and the guide ring 71 are fixed in the optical axis direction by attaching a fourth lens frame 35 for holding the fourth lens 114 to the rear barrel 31. That is, after inserting the cam ring 61 into which the guide ring 71 is inserted into the rear barrel 31, the screw portion 351 of the fourth lens frame 35 is engaged with the screw portion 316 formed on the inner surface of the rear barrel 31. 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 regulating the positions of the second and third lenses 112 and 113.
[0087]
Next, the latch structure of the target ring will be described. FIG. 20 is a perspective view showing the eye ring 37 and the rear lens barrel 31. As shown in FIG. 20, the eye ring 37 is inserted into the outer periphery of the rear lens barrel 31, and the screw portion 351 of the eyepiece lens frame 35 is engaged with the screw portion 316 formed at the rear end portion of the rear lens barrel 31. Thus, the eye ring 37 and the eyepiece lens frame 35 are fixed to the rear lens barrel 31. The eyepiece lens 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 ring 37 from being detached from the rear lens barrel 31.
[0088]
FIG. 21 is a side sectional view showing a locking structure for the rear lens barrel 31 of the eye ring 37. In order to slidably lock the eyepiece ring 37 with respect to the rear lens barrel 31, the eyepiece ring 37 is provided with convex portions 371 and 372, and the rear lens barrel 31 has three concave portions 321, 323 and 325. It is installed side by side. In addition, as shown in FIG. 20, between each of the recesses 321, 323, and 325, a recess is formed on the outer peripheral surface of the rear barrel 31, and a protrusion is formed on the recesses 321, 323, and 325 Second recesses 322 and 324 are formed.
[0089]
FIG. 22 is a plan view showing the convex portions 371 and 372 of the eye ring 37 and the concave portions 321 to 325 of the rear lens barrel 31. The eye ring 37 is shown 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. The size of the eye ring 37 is set so that the convex portions 371 and 372 and the concave portions 323 and 325 can engage with each other, as shown in FIG.
[0090]
When the eye ring 37 is pulled backward from the state shown in FIG. 21A, the convex parts 371 and 372 slide over the second concave parts 322 and 324 due to elastic deformation of the eye ring 37. Then, as shown in FIG. 21B, the eye 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. In this state, one end of the convex portion 371 comes into contact with the flange portion 353 of the eyepiece lens frame 35. As described above, the outer diameter of the flange portion 353 is set to such an extent that the convex portion 371 cannot get over by elastic deformation. That is, the flange portion 353 serves as a stopper for preventing the eye ring 37 from being removed.
[0091]
In addition, since the level | step difference between the 2nd recessed part 322,324 and the surface of the rear lens barrel 31 adjacent to the circumferential direction is set to such an extent that the convex part 331,332 cannot get over, the recessed part 321,323, 325 and the second concave portions 322 and 324 function as guide grooves 320 that guide the convex portions 371 and 372 in the optical axis direction.
[0092]
In the case of an observer wearing glasses, as shown in FIG. 21 (A), the eye ring 37 is used while being pressed, and in the case of an observer not wearing glasses, FIG. 21 (B). In this manner, the eye ring 37 is used in a state of being pulled out. When an observer wearing spectacles looks into the binoculars, the central portion of the spectacle lens protrudes toward the eyepiece lens frame 35. As described above, the end surface 352 of the eyepiece lens frame 35 facing the observer is formed as a concave surface having a radius of curvature R2 that prevents the eyeglass from hitting even if the observer peeks while wearing the eyeglass. . In the present embodiment, the radius of curvature R1 of the eyepiece surface 352 is set to 100 mm.
[0093]
FIG. 23 is a cross-sectional view showing the left target rubber 39 indicated by a dotted line in FIG. As shown in FIG. 23, an end surface 392 on the rear side (right side in the figure) of the target rubber 39 has a predetermined distance from the center X that is a predetermined distance T away from the optical axis 0 of the fourth lens 114 (not shown). It is formed with a curvature R3. Further, the right target rubber is formed symmetrically. In this way, by shifting the center of curvature from the optical axis, the target rubber can sufficiently cover both eyes of the observer, and can prevent intrusion of external light from the outside of the eyes.
[0094]
FIG. 24 is a side sectional view showing another example of the engagement ring locking structure. 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 eye ring 37.
[0095]
FIG. 25 is a plan view showing the openings 361, 362, 363 of the eye ring 37 and the convex portions 341, 342 on the outer periphery of the rear lens barrel 31. The eye ring 37 is shown removed from the rear lens barrel 31. The widths and lengths of the openings 361, 362, and 363 and the convex portions 341 and 342 are set so that two of the openings 361, 362, and 363 and the convex portions 341 and 342 can engage with each other.
[0096]
The openings 361, 362, 363 are formed in a groove 360 extending in the axial direction. Further, an axial step 367 is formed on the inner periphery of the eye ring 37.
Accordingly, as shown in FIG. 24A, the eye ring 37 is locked to the rear lens barrel 31 in a state where the convex portions 341 and 342 and the openings 361 and 362 are engaged with each other. When the eye ring 37 is pulled rearward from this state, the openings 361 and 362 slide over the convex portions 341 and 342 due to elastic deformation of the eye ring 37. Then, as shown in FIG. 22B, the eye 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.
[0097]
At this time, since the stepped portion 367 of the eye ring 37 contacts the flange portion 353 of the eyepiece lens frame 35, the eye ring 37 can no longer slide toward the right side in the drawing. Thus, the stepped portion 367 serves as a stopper for preventing the eye ring 37 from being removed. 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.
[0098]
Finally, the correspondence relationship between the characterizing portion of the present invention and the embodiment will be described.
As shown in FIG. 8, according to the binoculars 10 of the present embodiment, when a so-called visual field difference phenomenon occurs in which the range of the visual field differs depending on the left and right due to a lens assembly error or the like, the second lens frames 81 and 82 are provided. Alternatively, the left and right visual fields can be adjusted by changing the circumferential angle of the third lens frames 91 and 92 to the guide rings 71 and 72.
[0099]
【The invention's effect】
As described above, according to the lens holding structure of the present invention, in the event of a discrepancy phenomenon, the left and right visual fields can be adjusted by changing the mounting angle in the circumferential direction with respect to the guide ring of the lens frame. Is possible. This eliminates the need for lens replacement for matching the left and right visual fields.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a variable power binocular 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. 1;
4 is a side sectional view of the binoculars of FIG. 1. 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 of a zoom operation knob.
FIG. 14 is a plan view showing the binoculars with a part cut away.
FIG. 15 is a perspective view showing a focus and diopter difference adjusting mechanism.
16 is a cross-sectional view of binoculars taken along line segment XVI-XVI in FIG. 14;
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 barrel.
FIG. 20 is a perspective view showing an eye contact mechanism.
FIG. 21 is a side cross-sectional view showing an aiming mechanism.
FIG. 22 is a plan view showing the aiming mechanism.
FIG. 23 is a cross-sectional view of a target rubber.
FIG. 24 is a side sectional view showing another example of the aiming mechanism.
FIG. 25 is a plan view showing the aiming mechanism.
[Explanation of symbols]
10 Binoculars 13 and 14 Front barrel 15 and 16 Intermediate barrel 20 Objective frame 25 Rear frame 31 and 32 Rear barrel 35 and 36 Fourth lens frame 37 Eye ring 40 Belt member 41 Locking end 42 Locking claw 50 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 Lenses 114 and 124 Fourth lens 131 and 141 First lens frame 181 First drive unit 182 Second drive unit 183 Focus adjustment knob 184 Diopter difference adjustment knob 200 Front unit 320 Grooves 321, 323, 325 Concave portions 371, 372 Convex portions

Claims (6)

In variable power binoculars that move predetermined lenses of the left and right telephoto optical systems in the optical axis direction by relative rotation of the cam ring and the guide ring provided in the left and right telephoto optical systems,
A lens holding structure characterized in that a mounting direction in a circumferential direction of the lens frame holding the lens with respect to the guide ring can be changed. In a variable power binocular that has a front lens barrel and a rear lens barrel, and performs zooming by moving predetermined lenses of the left and right telephoto optical systems in the optical axis direction,
A lens frame for holding the lens;
A cam ring in which a cam of a predetermined shape is formed;
A plurality of guide grooves extending in the optical axis direction are formed at equal intervals in the circumferential direction, and
The lens frame is provided with a cam follower that engages with the cam and a plurality of guide protrusions that engage with the plurality of guide grooves, respectively, and the plurality of guide grooves are all the same shape, and the guide protrusions are also all the same shape. The lens holding structure is characterized in that the mounting position of the lens frame in the circumferential direction with respect to the guide ring can be changed. The cam ring and the guide either one of the ring is fixed to the rear barrel of the binoculars, the holding structure of the lens according to claim 2 in which the other is characterized in that, being rotated. Of the cam ring and guide ring, the guide ring is fixed to the rear barrel of the binoculars, and the cam ring is driven to rotate among the cam ring and guide ring. The lens holding structure according to claim 3. A guide groove extending in the optical axis direction of the lens is formed on the inner peripheral surface of the guide ring, and the guide protrusion that slidably engages with the guide groove is formed on the lens frame, The guide ring is formed with a long hole extending in the optical axis direction of the lens and through which the cam follower passes, and the cam follower passes through the long hole and engages with a cam formed in the cam ring. The lens holding structure according to claim 4, wherein: 6. The lens holding structure according to claim 5, wherein the guide groove and the guide projection are formed in the guide ring and the lens frame at intervals of 90 degrees in the circumferential direction, respectively.

Images