JP6027820B2 - Binocular magnifier - Google Patents

Description

  The present invention relates to a binocular magnifier, and more particularly to a binocular magnifier used for magnifying and observing a treatment site during surgery with the binocular.

  In surgery for treating fine tissues such as brain surgery and cardiovascular surgery, a wearer (physician) performs the operation while magnifying and observing the treatment portion with a magnifier. In such a case, a binocular magnifier is usually used to observe the treatment section in three dimensions.

  For example, in Patent Documents 1 and 2, a binocular magnifying glass is configured by forming circular openings in the center of the left and right spectacle lenses fixed to the spectacle frame, and fixing the magnifying optical system unit to these openings. Is disclosed.

  The magnifying optical system unit includes a real image type magnifying optical system including an objective lens and an eyepiece lens, and thereby, a part at hand of the wearer is magnified and observed.

  Therefore, the wearer can switch between magnified view through the magnifying optical system and equal magnification view without through the magnifying optical system by moving the line of sight, and in magnified view, the treatment is performed without tilting the head forward. The part can be magnified.

  Here, in order to enable stereoscopic viewing during magnified observation, the eyes of the wearer's eyes coincide with the exit pupils of the left and right magnification optical system units, and the right and left magnification optical systems at the position of the treatment section It is necessary to cross the optical axes of the units.

  Therefore, the mounting interval of the magnifying optical unit is determined according to the interpupillary distance (PD), and the convergence angle of both magnifying optical units is set according to the distance from the binocular magnifier to the treatment section (working distance WD). Furthermore, it is necessary to make the wearer's pupil coincide with the exit pupil of the magnifying optical system unit.

  However, in the binocular magnifying glass described in Patent Document 1, the optical magnifying unit is bonded and fixed to the spectacle frame, and there is no mechanism for alignment. Therefore, the magnifying optical system is made for each individual wearer at the time of shipment. There is a problem that the mounting position of the unit cannot be changed.

  In the binocular magnifying glass described in Patent Document 2, the optical magnifying unit can be moved up and down, left and right, but cannot be adjusted with respect to the front-rear direction and the optical axis angle. Therefore, there arises a problem that the optical magnifying unit cannot be adjusted to the optimum eye relief (the distance between the eyepiece and the eye), and the angle of the optical magnifying unit cannot be adjusted in the line-of-sight direction that is easy for a wearer to look into.

JP 2005-128305 A JP 2007-310006 A

  An object of the present invention is to provide a binocular magnifying glass capable of easily adjusting the position of a magnifying optical system unit suitable for a wearer when the binocular magnifying glass is mounted.

Such an object is achieved by the present invention described in the following (1) to ( 7 ).
(1) a frame that can be fixed to the head of the wearer;
A pair of magnifying optical system units supported by the frame and viewed by the left and right eyes of the wearer;
A binocular magnifier provided with an adjustment mechanism that supports the magnifying optical system unit on the left and right with respect to the frame so as to be position-adjustable;
The adjustment mechanism includes a first arm that supports the right and left magnification optical system units, and a second arm that connects the first arm and the frame.
The first arm is configured to support the left and right magnifying optical system units independently and detachably along a circular arc having a predetermined radius.
On the first arm, a scale indicating the separation distance between the left and right magnifying optical system units is formed corresponding to each of the left and right magnifying optical system units, and the separation distance is between the actual pupils of the wearer. It is written in the size converted from the distance from the distance,
The second arm is rotatably supported by the frame via a first rotation support portion on the distal end side, and is supported on the first arm via a second rotation support portion on the proximal end side. A binocular magnifying glass characterized in that the binocular magnifying glass is supported so as to be rotatable, and its entire length is configured to be extendable.

Thereby, the position adjustment of the magnifying optical system unit suitable for the wearer can be easily performed when the binocular magnifier is mounted.
In addition, the first arm supports the left and right magnifying optical system units so as to be able to approach and be separated from each other. Can be set.
Further, the first arm is formed with a scale indicating the separation distance between the left and right magnification optical system units, so that the separation distance matches the distance between the pupils of the wearer measured in advance. In accordance with the left and right pupils, the left and right magnifying optical system units can be reliably arranged.

(2) The binocular magnifying glass according to (1), wherein the first rotation support portion includes a first shaft and a first bearing into which the first shaft is inserted.
Thereby, the second arm is rotatably supported by the frame.

(3) The binocular magnifying glass according to (1) or (2), wherein the second rotation support part includes a second shaft and a second bearing into which the second shaft is inserted.
Accordingly, the first arm is rotatably supported by the second arm.

(4) The second arm includes two long plate members and a restriction screw, and the entire length is fixed by fastening the restriction screw to the two plate members (1). ) To (3) The binocular magnifier according to any one of the above.
Thereby, the 2nd arm can make the full length elastic.

  (5) One plate member is provided with a groove, and the other plate member is provided with a projection, and the entire length of the second arm is fixed with the projection inserted into the groove. The binocular magnifier according to (4), which is configured.

  Thereby, it is possible to accurately suppress or prevent the plate member from being displaced and rotated in the short direction (width direction) of the second arm.

(6) The binocular magnifier according to any one of (1) to (5) , wherein a plurality of the first arms having different radii are provided, and the first arms are appropriately replaced .

( 7 ) The binocular magnifying glass according to any one of (1) to ( 6 ), comprising left and right eyeglass lenses supported by the left and right magnifying optical system units, respectively.

  Accordingly, the wearer can switch between magnified view through the magnifying optical system and equal magnification view through the spectacle lens by moving the line of sight.

  According to the present invention, the second arm is rotatably supported by the frame at the distal end side via the first rotation support portion, and the second arm at the proximal end side via the second rotation support portion. Since it is rotatably supported by one arm and its entire length is configured to be extendable and retractable, position adjustment of the magnifying optical system unit suitable for the wearer can be easily performed when the binocular magnifier is attached. .

It is a perspective view which shows 1st Embodiment of the binocular magnifier of this invention. It is a partial expansion perspective view of the binocular magnifier shown in FIG. FIG. 2 is a partially enlarged top view of the binocular magnifier shown in FIG. 1. FIG. 3 is a partially enlarged rear view of the binocular magnifier shown in FIG. 1. It is side surface sectional drawing of the expansion optical system unit with which the binocular magnifier shown in FIG. 1 is provided. It is a figure which shows the relationship between the position of a wearer's eye, the support position of an expansion optical system unit, and the distance between pupils (PD). It is a perspective view which shows 2nd Embodiment of the binocular magnifier of this invention.

  Hereinafter, the binocular magnifier of the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.

<First Embodiment>
First, a first embodiment of the binocular magnifier of the present invention will be described.

  FIG. 1 is a perspective view showing a first embodiment of the binocular magnifier of the present invention, FIG. 2 is a partially enlarged perspective view of the binocular magnifier shown in FIG. 1, and FIG. 3 is a portion of the binocular magnifier shown in FIG. 4 is a partially enlarged rear view of the binocular magnifier shown in FIG. 1, FIG. 5 is a side sectional view of the magnification optical system unit included in the binocular magnifier shown in FIG. 1, and FIG. It is a figure which shows the relationship between the position of an eye, the support position of an expansion optical system unit, and the distance between pupils (PD).

  As shown in FIGS. 1 and 2, the binocular magnifier 1 includes a frame 10 that can be fixed to the wearer's head, a pair of magnifying optical system units 20A and 20B that can be seen by the left and right eyes of the wearer, and these And an adjusting mechanism 40 that supports the magnifying optical system units 20A and 20B with respect to the frame 10 so that the position thereof can be adjusted.

  As shown in FIG. 1, the frame 10 has a front part 11 positioned on the front face of the wearer's forehead during wearing, and extends rearward from both ends of the front part 11 so as to sandwich the wearer's temporal region. It has a side surface portion 12 to be fixed, a strap 15 provided in the middle of the side surface portion 12 to prevent dropping from the head, and a connection portion 13 formed near the center of the front surface portion 11.

  Further, an adjustment mechanism 40 is supported on the front surface of the connection portion 13, and a nose pad 50 for fixing the binocular magnifier 1 to the wearer is fixed on the back surface of the connection portion 13. Details of the adjustment mechanism 40 will be described later.

  The magnifying optical system units 20A and 20B have a magnifying optical system for magnifying and observing an object.

  Hereinafter, the magnifying optical system units 20A and 20B, that is, the magnifying optical system will be described. In the magnifying optical system unit 20A having the optical system for the left eye and the magnifying optical system unit 20B having the optical system for the right eye, Since the configuration is the same for the left eye and the right eye only by reversing the left and right, the description of the magnification optical system unit 20B for the right eye will be omitted below, and the magnification optical system unit 20A for the left eye will be described as a representative. To do.

  As shown in FIG. 5, the optical system of the magnifying optical system unit 20A includes an objective lens 21 having a positive power and an eyepiece 22 having a negative power, and is a so-called Galileo type for magnifying and observing an object. The magnifying optical system.

  The light from the observation target enters the objective lens 21, passes through the objective lens 21, and further passes through the eyepiece lens 22 to reach the wearer's eye EL. Thereby, the wearer can magnify and observe the object at hand while facing the front.

  As shown in FIG. 5, the objective lens 21 of the magnifying optical system unit 20 </ b> A is incorporated in the objective lens barrel 24, and the eyepiece lens 22 is incorporated in the eyepiece lens barrel 25.

  The objective lens barrel 24 is formed with a female screw on the inner peripheral portion thereof, and the eyepiece lens barrel 25 is formed with a male screw on the outer peripheral portion thereof. Screwed into the lens barrel 25. As a result, the objective lens barrel 24 and the eyepiece lens barrel 25 are connected.

  Further, focusing of the magnifying optical system unit 20A is performed by adjusting the distance between the objective lens 21 and the eyepiece lens 22, and this distance is the screwing amount of the objective lens barrel 24 to the eyepiece lens barrel 25. Is set by Furthermore, a ring 23 that is screwed into the male screw is provided in the middle of the male screw of the eyepiece lens barrel 25, and the ring 23 is brought into contact with the base end of the objective lens barrel 24, thereby allowing the ring 23 Exhibits a function as a stopper for maintaining the separation distance.

  Further, a groove 27 is formed in the middle of the outer periphery of the eyepiece lens barrel 25, and a fixing ring 28 is attached to the proximal end (eye side).

  The magnifying optical system unit 20A is configured such that the objective lens 21, the objective lens barrel 24, the eyepiece lens 22, the eyepiece lens barrel 25, the ring 23, and the fixing ring 28 are integrally assembled, and the groove 27 of the eyepiece lens barrel 25 is assembled. Are held by the frame body 42 </ b> A included in the adjustment mechanism 40, and are thereby supported by the frame 10.

Next, the configuration of the adjustment mechanism 40 will be described.
2 to 4, the adjustment mechanism 40 includes a first arm 41 that supports the left and right magnifying optical system units 20 </ b> A and 20 </ b> B, and a second arm 43 that connects the first arm 41 and the frame 10. The second arm 43 is rotatably supported on the frame 10 via the first rotation support portion 44 on the distal end side, and has the second rotation support portion 45 on the proximal end side. The first arm 41 is rotatably supported by the first arm 41, and its entire length is configured to be extendable.

  The first rotation support portion (first hinge portion) 44 has a first shaft and a first bearing into which the first shaft is inserted, and a through hole formed on the distal end side of the second arm 43. The second arm 43 pivots on the frame 10 by inserting and fixing the first bearing to the first shaft while the first shaft is inserted into the through hole formed in the connection portion 13 of the frame 10. Supported as possible.

  The second rotation support part (second hinge part) 45 has a second shaft and a second bearing into which the second shaft is inserted, and is formed on the proximal end side of the second arm 43. In a state where the second shaft is inserted into the through hole and the through hole formed in the central portion 41a of the first arm 41, the second arm is inserted into the second shaft and fixed, whereby the first arm 41 is fixed. The second arm 43 is rotatably supported.

  The second arm 43 includes two long plate members 43a and 43b and a regulating screw 43c. The plate member 43a has a long hole 43d that opens in the longitudinal direction thereof. The plate member 43b has a hole 43e into which the restriction screw 43c is inserted, and the position of the restriction screw 43c inserted into the hole 43e is a long hole. After changing along 43d, the regulating screw 43c is fastened. By setting it as this structure, the 2nd arm 43 becomes a thing which can expand-contract the full length.

  Further, the plate member 43a is provided with a groove 43f, and the plate member 43b is provided with a convex portion 43g. With the convex portion 43g inserted into the groove 43f, the full length of the second arm 43 is increased by the regulating screw 43c. It is configured to be fixed. As a result, the groove 43f and the convex portion 43g function as a guide when the second arm 43 is expanded and contracted, so that the plate members 43a and 43b are displaced in the short direction (width direction) of the second arm 43. It is possible to accurately suppress or prevent the rotation.

  The first arm 41 has a long shape extending in the pupil width direction connecting the pupils of both eyes of the wearer, and has long holes 41b and 41c formed along the pupil width direction. In the long holes 41b and 41c, frame bodies 42A and 42B, which are movably arranged, are fixed by fastening screws 41d and 41e, respectively. Further, the magnifying optical system units 20A and 20B are mounted on the frame bodies 42A and 42B, respectively, whereby the left and right magnifying optical system units 20A and 20B are supported by the first arm 41 so as to be able to approach and separate. The As a result, the distance between the left and right magnifying optical system units 20A, 20B can be set according to the interpupillary distance (PD) of the wearer.

  Each of the frame bodies 42A and 42B includes a ring-shaped rim 42b and a holding portion 42a protruding from the rim 42b. The frames 42A and 42B are fixed to the first arm 41 by fastening the screws 41d and 41e into the screw holes formed in the holding portion 42a.

  Further, the rim 42b has a cut portion cut at one place forming the ring shape, and this cut portion is connected by fastening of a screw 42d. With the screw 42d loosened, the rim 42b is inserted into the groove 27 of the magnifying optical system units 20A and 20B, and then the screw 42d is fastened, so that the magnifying optical system units 20A and 20B are attached to the frames 42A and 42B. Is fixed.

  Furthermore, in this embodiment, as shown in FIG. 3, each of the long holes 41b and 41c is formed along a circle having a radius R. Then, the radius R of the arc is set so that the intersection A (that is, the center of the arc) of the optical axes L of the left and right magnifying optical system units 20A and 20B supported by the first arm 41 coincides with the treatment portion. As a result, the wearer can visually recognize the treatment portion located at the intersection A of the optical axis L in three dimensions. Therefore, even if the fixed position of the magnifying optical system units 20A and 20B is changed according to the interpupillary distance (PD) of the wearer, the treatment section is always at the intersection of the optical axes L of the magnifying optical system units 20A and 20B. Can be visually recognized three-dimensionally.

  The working distance WD, which is the distance from the binocular magnifier 1 to the treatment portion, is determined by forming the long holes 41b and 41c along a circle having a radius R, so that a fixed value of the radius R is obtained. However, the working distance WD can be set to a desired size by preparing a plurality of first arms 41 with different radii R and replacing them appropriately. That is, the working distance WD can be set to a desired size according to the preference of the wearer, the position of the treatment section, and the like.

  Further, the first arm 41 is formed with scales 46A and 46B indicating the distance between the left and right magnifying optical system units 20A and 20B. By setting (matching) this separation distance to the distance between the pupils of the wearer measured in advance, the left and right magnifying optical system units 20A and 20B can be reliably arranged in accordance with the left and right pupils, respectively. it can.

  As shown in FIG. 6, the support positions of the magnifying optical system units 20 </ b> A and 20 </ b> B are located closer to the treatment portion than the position of the wearer's eyes. Therefore, the separation distance between the magnifying optical system units 20A and 20B is shorter than the actual inter-pupil distance of the wearer. For this reason, in the present embodiment, the scales 46A and 46B indicating the separation distances of the magnifying optical system units 20A and 20B are described in a size obtained by converting the deviation from the actual interpupillary distance. Thereby, according to the left and right pupils, the left and right magnifying optical system units 20A and 20B can be more reliably arranged.

  Next, a procedure for adjusting the positions of the left and right magnifying optical system units 20A and 20B so that the above-described binocular magnifier 1 is adapted to the wearer will be described.

<1> First, the distance between the pupils of the wearer (PD) and the distance from the binocular magnifier desired by the wearer to the treatment section (working distance WD) are obtained.

  Then, the first arm 41 provided with the obtained working distance WD as the distance to the intersection A of the optical axis L is attached to the binocular magnifier 1.

  Thereafter, the distance between the left and right magnifying optical units 20A and 20B is set to the inter-pupil distance (PD). That is, the positions of the scales 46A and 46B shown on the first arm 41 are made to coincide with the obtained interpupillary distance (PD).

  When the wearer's interpupillary distance (PD) cannot be obtained, the setting of the separation distance between the magnifying optical units 20A and 20B can be omitted.

<2> Next, the wearer wears the binocular magnifier 1 and then loosens the restriction screw 43c of the second arm 43 so that the position of the restriction screw 43c with respect to the long hole 43d can be changed. By making it possible to change the positional relationship of the plate members 43a and 43b with respect to the longitudinal direction, the entire length of the second arm 43 can be expanded and contracted.

  Then, after setting the distance from the frame 10 to the left and right magnifying optical system units 20A, 20B to a position suitable for the wearer, that is, the upper and lower positions of the magnifying optical system units 20A, 20B, the regulating screw 43c By fastening, the length of the second arm 43 is fixed to a size suitable for the wearer.

<3> Next, the second arm 43 is rotated with respect to the frame 10 via the first rotation support portion 44 while the binocular magnifier 1 is kept attached. By the rotation of the second arm 43, the left and right magnifying optical system units 20A and 20B move (turn) around the first rotation support portion 44.

  When the right and left magnifying optical system units 20A and 20B have the optimum eye relief (the distance between the eyepiece and the eye), that is, the observation field of view is the largest, and the magnifying optical system units 20A and 20B are the most visible from the eyes. When it leaves | separates, the rotation in the 1st rotation support part 44 is stopped. Thereby, the right and left magnifying optical system units 20A and 20B are fixed with the optimum eye relief.

<4> Next, the first arm 41 is rotated with respect to the second arm 43 via the second rotation support unit 45 while the binocular magnifier 1 is being mounted. By the rotation of the first arm 41, the left and right magnifying optical system units 20 </ b> A and 20 </ b> B move (rotate) around the second rotation support part 45.

  The optimal eye relief set in the step <3> is maintained by the rotation of the expansion optical system units 20A and 20B in the second rotation support part 45 proximal to the left and right expansion optical system units 20A and 20B. The magnification optical system units 20A and 20B can be moved as they are. Therefore, the rotation in the second rotation support portion 45 stops the rotation when the magnifying optical system units 20A and 20B are positioned in the line-of-sight direction that is easy for a wearer to look into. Accordingly, the magnifying optical system units 20A and 20B are fixed in a line-of-sight direction that is easy for a wearer to look into.

  Note that the line-of-sight direction that is easy for a wearer to look into may be either the upper or lower line-of-sight direction with respect to the line-of-sight direction for equal magnification without passing through the magnifying optical system units 20A and 20B.

<5> Next, while maintaining the mounting of the binocular magnifier 1, the screws 41d and 41e of the first arm 41 are loosened, and the positions of the screws 41d and 41e with respect to the long holes 41b and 41c can be changed. Since the positions of the left and right magnifying optical system units 20A and 20B with respect to the longitudinal direction of the first arm 41 can be changed, the distance between the left and right magnifying optical system units 20A and 20B can be changed.

  Then, the wearer sets the separation distance at a position where the two images (treatment portions) viewed from the left and right magnifying optical system units 20A and 20B coincide (overlap), and then fastens the screws 41d and 41e. The magnifying optical system units 20A and 20B are fixed to the first arm 41 with the separation distance maintained at an appropriate size. Thereby, the treatment part peeped from the magnifying optical system units 20A and 20B can be viewed three-dimensionally.

  In the step <1>, an image seen from the left and right magnifying optical system units 20A and 20B at a separation distance between the left and right magnifying optical system units 20A and 20B set based on the obtained interpupillary distance (PD). When the treatment section is visually recognized in three dimensions, this step <5> can be omitted.

  The adjustment of the support positions of the left and right magnifying optical system units 20A and 20B using the adjustment mechanism 40 described in the steps <2> to <5> is performed in the order of the steps <2> to <5>. However, the order is not particularly limited, and particularly when fine adjustment of the support position is performed, the step <2> is performed after the steps <2> to <5>. At least one of the steps <4> may be performed.

  As described above, according to the binocular magnifying glass 1 of the present invention, when the wearer wears the binocular magnifying glass 1, the position adjustment of the magnifying optical system units 20A and 20B by the steps <2> to <5> is performed. By doing so, the magnifying optical system units 20A and 20B can be arranged at positions suitable for the wearer. That is, according to the binocular magnifier 1 of the present invention, the position adjustment of the magnifying optical system units 20A and 20B suitable for the wearer can be easily performed when the binocular magnifier 1 is mounted.

Second Embodiment
Next, a second embodiment of the binocular magnifier of the present invention will be described.

FIG. 7 is a perspective view showing a second embodiment of the binocular magnifier of the present invention.
Hereinafter, the binocular magnifier 1 of the second embodiment will be described with a focus on the differences from the binocular magnifier 1 of the first embodiment, and the description of the same matters will be omitted.

  The binocular magnifying glass 1 shown in FIG. 7 is the same as the binocular magnifying glass 1 shown in FIG. 1 except that the binocular magnifying glass 1 includes left and right eyeglass lenses 30A and 30B supported by the left and right magnifying optical system units 20A and 20B, respectively.

  That is, in the binocular magnifier 1 of the second embodiment, the eyeglass lenses 30A and 30B are formed with the opening 31, and the eyepiece lens barrel 25 is inserted into the opening 31 and the fixing ring 28 is inserted. On the side, the spectacle lenses 30A and 30B are fixed to the magnifying optical system units 20A and 20B. Accordingly, the wearer moves his / her line of sight between magnified view through the magnified optical system units 20A and 20B and equal magnification view through the spectacle lenses 30A and 30B without going through the magnified optical system units 20A and 20B. Can be switched with. In addition, through the spectacle lenses 30A and 30B, it is possible to perform observation by equal magnification according to myopia, hyperopia and astigmatism.

  The binocular magnifier 1 of the second embodiment can also obtain the same effect as that of the first embodiment.

  The binocular magnifier of the present invention has been described based on the illustrated embodiment, but the present invention is not limited to this.

  For example, in the binocular magnifying glass of the present invention, each component can be replaced with an arbitrary component that can exhibit the same function, or an arbitrary component can be added.

  In the above-described embodiment, the case where the optical system of the left and right magnifying optical system units is a Galileo optical system that includes an objective lens having a positive power and an eyepiece having a negative power is described. However, the present invention is not limited to such a configuration. For example, the real image type magnifying optical system including an objective lens having positive power and an eyepiece having positive power is disposed between the objective lens and the eyepiece. It may be a Kepler type optical system composed of erecting elements that erect an image. The erecting element may be a roof prism that is a deflecting element that deflects the optical path of the magnifying optical system to one side and erects the image.

DESCRIPTION OF SYMBOLS 1 Binocular magnifier 10 Frame 11 Front part 12 Side part 13 Connection part 15 Strap 20A, 20B Magnifying optical system unit 21 Objective lens 22 Eyepiece lens 23 Ring 24 Objective lens barrel 25 Eyepiece lens barrel 27 Groove 28 Fixing ring 30A, 30B Eyeglass lens 31 Opening 40 Adjustment mechanism 41 First arm 41a Central part 41b, 41c Long hole 41d, 41e Screw 42A, 42B Frame 42a Holding part 42b Rim 42d Screw 43 Second arm 43a, 43b Plate member 43c Restriction screw 43d Long Hole 43e Hole 43f Groove 43g Convex 44 First rotation support 45 Second rotation support 46A, 46B Scale 50 Nose pad

Claims (7)

A frame that can be fixed to the head of the wearer;
A pair of magnifying optical system units supported by the frame and viewed by the left and right eyes of the wearer;
A binocular magnifier provided with an adjustment mechanism that supports the magnifying optical system unit on the left and right with respect to the frame so as to be position-adjustable;
The adjustment mechanism includes a first arm that supports the right and left magnification optical system units, and a second arm that connects the first arm and the frame.
The first arm is configured to support the left and right magnifying optical system units independently and detachably along a circular arc having a predetermined radius.
On the first arm, a scale indicating the separation distance between the left and right magnifying optical system units is formed corresponding to each of the left and right magnifying optical system units, and the separation distance is between the actual pupils of the wearer. It is written in the size converted from the distance from the distance,
The second arm is rotatably supported by the frame via a first rotation support portion on the distal end side, and is supported on the first arm via a second rotation support portion on the proximal end side. A binocular magnifying glass characterized in that the binocular magnifying glass is supported so as to be rotatable, and its entire length is configured to be extendable.   2. The binocular magnifier according to claim 1, wherein the first rotation support portion includes a first shaft and a first bearing into which the first shaft is inserted.   The binocular magnifying glass according to claim 1 or 2, wherein the second rotation support portion includes a second shaft and a second bearing into which the second shaft is inserted.   4. The second arm according to claim 1, wherein the second arm includes two plate members having a long shape and a regulation screw, and the entire length thereof is fixed by fastening the regulation screw to the two plate members. The binocular magnifier according to any one of the above.   One plate member is provided with a groove, and the other plate member is provided with a convex portion, and is configured to fix the entire length of the second arm with the convex portion inserted into the groove. The binocular magnifier according to claim 4.   The binocular magnifier according to any one of claims 1 to 5, wherein a plurality of the first arms having different radii are provided, and the first arms are appropriately replaced. The binocular magnifier according to any one of claims 1 to 6 , further comprising left and right eyeglass lenses respectively supported by the left and right magnifying optical system units.

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