JP2012112994A - Binocular lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a binocular lens barrel using a mirror, capable of adjusting an eye width, and easy to use.SOLUTION: A binocular lens barrel includes a first ocular lens 22, a second ocular lens 23, a first body frame 9 incorporating a beam splitter 18 and a first mirror 19, a second body frame 11 incorporating a second mirror 20 and a third mirror 21, a rotary shaft member 7 fitting the first body frame 9 and the second body frame 11 rotatably, and a resin ring 10 disposed between the second body frame 11 and the rotary shaft member 7 and supporting the second body frame 11 rotatably. The second body frame 11 is chamfered at a part of corners on the rotary shaft member 7 side.

Description

  The present invention relates to a binocular tube that can adjust the eye width.

  2. Description of the Related Art Conventionally, as a lens barrel used in a microscope, a number of Gieden top type lens barrels that can adjust an interval between two optical axes in accordance with a user's eye width have been adopted. As such a lens barrel, for example, a lens barrel as shown in FIGS. 17 and 18 is known (see, for example, Patent Document 1). The lens barrel includes a rotation shaft 120, a first prism base 121 and a second prism base 122 rotatably supported by the rotation shaft 120, and fixed plates 123 and 124 that are detachably attached to the prism bases. And prisms 125 and 126 that are bonded and fixed to the fixing plates 123 and 124, respectively.

  The rotating shaft 120 has a cylindrical shape with an open lower end surface, and a flange 131 is formed on the outer peripheral edge in the vicinity of the lower end surface. On the side surface of the rotating shaft 120, an opening 132 is formed in which a region from the lower end surface to the intermediate position in the axial direction and a region from the half position in the radial direction are cut out. In addition, an opening 133 is formed on the side surface of the rotating shaft 120 from the intermediate position to the upper end surface in the axial direction and in which a region from the opening 132 to a position shifted by 180 degrees in the radial direction is notched. .

  A part of the prism 125 bonded and fixed to the fixing plate 123 is inserted into the opening 132 and fixed to the prism base 121. A part of the prism 126 bonded and fixed to the fixing plate 124 is inserted into the opening 133 and fixed to the prism base 122. A dish washer and a fixing plate (not shown) are inserted at the tip of the rotating shaft 120 on the opposite side of the flange 131, and the prism bases 121 and 122 are fixed by fixing the fixing plate to the rotating shaft 120 by deforming the dish washer. Press in the direction of the flange 131.

  According to the lens barrel having these configurations, a mechanism in which the two optical axes rotate around the rotation axis 120 and the eye width can be adjusted is realized.

  A lens barrel as shown in FIGS. 19 and 20 is also known (see, for example, Patent Document 2). This lens barrel has a configuration in which a first lens barrel arm 206 is pivotably attached to the receiving plate 205 and a second lens barrel arm 211 is pivotally attached to the first lens barrel arm 206. With this configuration, the first lens barrel arm 206 and the second lens barrel arm 211 can be moved to contrast positions 206 ′ and 211 ′ with respect to the optical axis 200 as shown in FIG.

Japanese Utility Model Publication No. 6-43615 Japanese Utility Model Publication No. 2-121712

  However, in the configuration described in Patent Document 1, since a part of the prisms 125 and 126 is inserted into the openings 132 and 133, respectively, the rotation range of the prism bases 121 and 122 is larger than that of the openings 132 and 133. Accordingly, there is a problem that it is limited to a narrow range. Specifically, as shown by the arrow R in FIG. 18, the range for adjusting the eye width is limited to only one of the lower sides from the state where the prism bases 121 and 122 are substantially horizontal. For this reason, the eye point at the time of observation by the user is limited to one place, and the eye width cannot be adjusted according to the height of the user, so that the usability of the microscope is poor.

  In the configuration described in Patent Document 1, the design may be changed from an expensive prism to an inexpensive mirror in order to further reduce the cost. Unlike a prism, the mirror has a thickness of glass material on the back side of the reflecting surface, and requires an allowance for applying the reflecting surface to the holding frame. It is necessary to secure a larger space than the prism. Therefore, the openings 132 and 133 must be enlarged. However, when the openings 132 and 133 are made larger than the configuration described in Patent Document 1, there is a problem that the rigidity of the rotary shaft is lowered, the product cannot be used as a product, and the mirror cannot be applied. It was.

  In addition, in the configuration described in Patent Document 2, there is no rotating shaft member that penetrates both lens barrel arms, so that the lens barrel arm can be easily touched when the user touches the lens barrel arm to adjust the eye width. As a result, the observation image of the right eye is shifted from the observation image of the left eye, which hinders observation. Accordingly, accurate adjustment cannot be made unless the eye width adjustment is performed while viewing the same observation image, and observation must always be performed so as not to touch the lens barrel arm, and the usability of the microscope is poor.

  The present invention has been made in view of the above, and an object of the present invention is to provide a binocular tube that is easy to use and that can use a mirror and adjust the eye width.

  In order to solve the above-described problems and achieve the object, a binocular tube according to the present invention is a binocular tube whose eye width can be adjusted. In the binocular tube, the first eyepiece lens, the second eyepiece lens, and the external A first optical system including a beam splitter and a first mirror for branching a light beam, and guiding one light beam branched by the beam splitter to the first eyepiece by reflection of the first mirror; and A first body frame containing an optical system; a second mirror; and a third mirror. The other light beam branched by the beam splitter is reflected by the second mirror and the third mirror. A second optical system that leads to the second eyepiece, a second main body frame that contains the second optical system, and a rotary shaft member that rotatably fits the first main body frame and the second main body frame. A first resin ring that is disposed between the second main body frame and the rotary shaft member and rotatably supports the second main body frame, and the second main body frame includes the rotary shaft member The corners on the side are chamfered.

  In the binocular tube according to the present invention, the second main body frame and the first ring are chamfered with each other, the chamfered surface of the second main body frame and the chamfered surface of the first resin ring. Is characterized by surface contact.

  In the binocular tube according to the present invention, the chamfered surface of the second main body frame and the first resin ring are in point contact.

  In the binocular tube according to the present invention, the rotating shaft member has a substantially cylindrical portion, and the distal end side surface and the proximal end side surface of the approximately cylindrical portion of the rotating shaft member are cut out over a half or more circumference from different sides. It is characterized by being.

  The binocular tube according to the present invention is characterized in that the first main body frame is chamfered at some corners on the rotating shaft member side.

  The binocular tube according to the present invention further includes a second resin ring that is disposed between the first main body frame and the rotation shaft member and rotatably supports the first main body frame, The resin ring is chamfered, and the chamfered surface of the first main body frame and the chamfered surface of the second resin ring are in surface contact with each other.

  In the binocular tube according to the present invention, the rotating shaft member is formed with an inclined surface that comes into contact with the chamfered surface of the first main body frame.

  In the binocular tube according to the present invention, some corners of the second body frame on the rotating shaft member side of the first body frame and the second body frame are chamfered, and the second body frame is disposed between the second body frame and the rotating shaft member. By providing a resin ring that rotatably supports the main body frame of 2, the external force applied for eye width adjustment and observation can be efficiently converted into the rotation of the second body frame, allowing wide eye width adjustment. Thus, the notch portion of the rotating shaft member can be enlarged, and the usability is improved.

FIG. 1 is a front view of a microscope having a binocular tube according to the first embodiment. FIG. 2 is a diagram in which the binocular portion of the binocular tube shown in FIG. 1 is partially cut from the upper part of FIG. 1 around the rotation axis of the eye width adjusting mechanism. FIG. 3 is an enlarged view of a partial region in FIG. FIG. 4 is an enlarged view of a partial region in FIG. FIG. 5 is an enlarged view of a partial region in FIG. FIG. 6 is an enlarged view of a partial region in FIG. FIG. 7 is an exploded perspective view of the constituent members of the mechanism for adjusting the eye width in FIG. 8 is a cross-sectional view taken along line AA shown in FIG. 9 is a cross-sectional view taken along line BB shown in FIG. 10 is a cross-sectional view taken along line CC shown in FIG. 11 is a cross-sectional view taken along the line DD shown in FIG. 12 is a cross-sectional view taken along line EE shown in FIG. FIG. 13 is a diagram in which the binocular portion of the binocular tube according to the second embodiment is partly cut from the top around the rotation axis of the eye width adjustment mechanism. FIG. 14 is an enlarged view of a partial region in FIG. FIG. 15 is an enlarged view of a partial region in FIG. FIG. 16 is an enlarged view of a partial region in FIG. FIG. 17 is a cross-sectional view for explaining a binocular tube according to the prior art. FIG. 18 is an exploded perspective view of the eye width adjustment mechanism used in the binocular tube shown in FIG. FIG. 19 is a cross-sectional view illustrating a binocular tube according to a conventional technique. 20 is a perspective view of the binocular tube shown in FIG.

  Hereinafter, as an embodiment according to the present invention, binoculars used for a microscope will be described as an example. Note that the present invention is not limited to the embodiments. In the description of the drawings, the same parts are denoted by the same reference numerals.

(Embodiment 1)
First, the first embodiment will be described. FIG. 1 is a front view of a microscope having a binocular tube according to the first embodiment. As shown in FIG. 1, the microscope 100 according to the first embodiment includes a microscope body 1, a lens barrel 2, an objective lens 3, a stage 4, and a condenser 5.

  A revolver 3a is provided on the front side of the microscope main body 1, and the objective lens 3 is attached to the revolver 3a in a replaceable manner. The lens barrel 2 is mounted on the upper part of the revolver 3a. A binocular portion 2 a having a pair of eyepieces is provided on the front surface of the lens barrel 2. As will be described later, the binocular unit 2a is provided so as to be rotatable as indicated by an arrow along the plane of FIG. The microscope main body 1 supports a stage 4 on which a specimen is placed. The specimen is moved up and down through the stage 4 in conjunction with the turning operation of the focusing handle 3b provided on the side surface of the microscope body 1, and is focused (focused) on the objective lens 3. . The objective lens 3 is alternatively arranged on the specimen on the stage 4 according to the rotation operation of the revolver 3a. The microscope main body 1 is irradiated with illumination light supplied from a light source (not shown) onto the specimen on the stage 4 via the objective lens 3 by an illumination optical system provided inside. The objective lens 3 forms an observation image of the specimen illuminated by the illumination optical system in cooperation with an imaging lens included in the lens barrel 2. At this time, the objective lens 3 condenses the observation light emitted from each point of the specimen and emits it as parallel light to the imaging lens. The imaging lens condenses the observation light emitted by the objective lens 3 to form an observation image. The capacitor 5 is configured by a condensing lens or a condensing mirror according to an observation method such as polarization observation, bright field observation, dark field observation, or the like.

  The lens barrel 2 shown in FIG. 1 will be described in detail. The lens barrel 2 divides observation light incident from the objective lens 3 provided in the microscope main body 1 into two by an optical system, and allows the divided observation light to enter two eyepieces so that the same image can be observed with both eyes. The binocular tube has a Gidentop type eye width adjustment mechanism that can adjust the eye width, which is the distance between both eyes.

  2 is a diagram in which the binocular portion 2a of the lens barrel 2 shown in FIG. 1 is partially cut from the upper part of FIG. 1 around the rotation axis of the eye width adjusting mechanism. As shown in FIG. 2, the binocular unit 2 a has an outer frame 2 c through which a light beam from the objective lens 3 can be guided, and an optical axis 6 that coincides with the observation optical axis of the objective lens 3. The member 7, the first main body frame 9 and the second main body frame 11 that are rotatably fitted to the rotary shaft member 7, the beam splitter 18 that is fixed inside the first main body frame 9, and the inside of the first main body frame 9 are fixed. The first optical system having the first mirror 19, the second mirror 20 fixed inside the second main body frame 11, and the second optical system having the third mirror 21 fixed inside the second main body frame 11 The first eyepiece lens 22 is fixed to the first main body frame 9, and the second eyepiece lens 23 is fixed to the second main body frame 11.

  The light beam from the objective lens 3 is branched into two by the beam splitter 18. One light beam branched by the beam splitter 18 is guided by the first eyepiece 22 by being reflected by the first mirror 19. The other light beam branched by the beam splitter 18 is reflected by the second mirror 20 and then reflected by the third mirror 21 to be guided to the second eyepiece lens 23.

  Next, the eye width adjustment mechanism will be described with reference to FIGS. FIG. 3 is an enlarged view of the area A1 in FIG. FIG. 4 is an enlarged view of the area A2 in FIG. FIG. 5 is an enlarged view of the area A3 in FIG. FIG. 6 is an enlarged view of region A4 in FIG. FIG. 7 is an exploded perspective view of the constituent members of the mechanism for adjusting the eye width in FIG. 8 is a cross-sectional view taken along line AA shown in FIG. 9 is a cross-sectional view taken along line BB shown in FIG. 10 is a cross-sectional view taken along line CC shown in FIG. 11 is a cross-sectional view taken along the line DD shown in FIG. 12 is a cross-sectional view taken along line EE shown in FIG.

  As shown in FIGS. 3, 4, and 7, the rotating shaft member 7 has a substantially cylindrical portion, and a flange portion 7 a serving as a base is formed at a lower portion of the substantially cylindrical portion. On the upper portion of the flange portion 7a, a fitting portion 7b that is a contact portion with other members is formed. A hole 7g in which a screw 16 (to be described later) is fixed is formed in the tip surface 7c of the substantially cylindrical portion. As shown in FIGS. 7 and 8, the base end side surface 7h and the tip end side surface 7i of the substantially cylindrical portion of the rotating shaft member 7 are cut out from a different side over not less than a half circumference and a cutout portion 7f. Is formed. The notch 7e on the side surface 7h of the base end part is provided so that the beam splitter 18 and the fixing member of the beam splitter 18 do not interfere with the rotary shaft member 7 during eye width adjustment, and the notch of the distal end side portion 7i is provided. The part 7f is provided so that the second mirror 20 and the fixing member of the second mirror 20 do not interfere with the rotating shaft member 7 when adjusting the eye width.

  Between the fitting part 7b of the rotating shaft member 7 and the first main body frame 9, a resin ring 8 having an inner diameter Da substantially the same as the outer diameter of the fitting part 7b is disposed. The resin ring 8 rotatably supports the first main body frame 9. The resin ring 8 is formed of a wear-resistant material such as polyacetal resin.

  The first main body frame 9 has a cylindrical portion having an inner diameter Da that is substantially the same as the outer diameter of the fitting portion 7 b of the rotating shaft member 7. The cylindrical portion of the first main body frame 9 is fitted from the outside of the rotating shaft member 7. The cylindrical portion of the first main body frame 9 is partly cut away from the side surface so as to correspond to the cutout surface 7 e of the rotary shaft member 7. The first main body frame 9 is supported by the rotary shaft member 7 with the resin ring 8 interposed therebetween.

  The first main body frame 9 and the resin ring 8 are chamfered and contact each other as shown in FIGS. 3, 7, 9 and 10. The first main body frame 9 has a chamfered corner on the lower side of the cylindrical portion of the corners on the rotating shaft member 7 side, and the resin ring 8 is a chamfered surface of the first main body frame 9 over the entire circumference. The corner that contacts 9a is chamfered. As shown in FIG. 9, the resin ring 8 has a substantially triangular cross section when cut by a plane parallel to the central axis of the resin ring 8, and the chamfered surface 9 a of the first main body frame 9. The chamfered surface 8a of the resin ring 8 is in surface contact. When the first main body frame 9 is pressed along the optical axis 6 in the direction of the flange portion 7a of the rotary shaft member 7, the chamfered surface 8a of the resin ring 8 and the first main body frame 9 are formed as shown in FIG. The chamfered surface 9a is in close contact with the chamfered surface 9a. The resin ring 8 is partially cut to prevent a problem of dimensional change due to a change in environmental temperature.

  As shown in FIGS. 7 and 11, the resin ring 10 has substantially the same shape as the resin ring 8. As shown in FIGS. 2, 4, and 5, the resin ring 10 is disposed between the second main body frame 11 and the rotary shaft member 7 and rotatably supports the second main body frame 11. The resin ring 10 is formed of a wear-resistant material like the resin ring 8.

  The second main body frame 11 has a cylindrical portion having an inner diameter Da that is substantially the same as the outer diameter of the fitting portion 7 b of the rotating shaft member 7. The cylindrical portion of the second main body frame 11 is fitted from the outside of the rotating shaft member 7. The cylindrical portion of the second main body frame 11 has a part of the side surface cut out so as to correspond to the cutout surface 7 f of the rotating shaft member 7.

  As shown in FIGS. 2, 4, 5, 7, and 11, the second main body frame 11 and the resin ring 10 are chamfered and contact each other. The second body frame 11 has a chamfered corner at a part of the rotating shaft member 7 side. As shown in FIG. 11, the resin ring 10 has a substantially triangular cross section when cut along a plane parallel to the central axis of the resin ring 10, and the chamfered surface 11 a of the second body frame 11. The chamfered surface 10a of the resin ring 10 is in surface contact. When the second main body frame 11 is pressed along the optical axis 6 in the direction of the flange portion 7a of the rotary shaft member 7, the chamfered surface 10a of the resin ring 10 and the second main body as shown in FIGS. The frame 11 is chamfered with the chamfered surface 11a. The resin ring 10 is partially cut to prevent a problem of dimensional change due to a change in environmental temperature.

  The second body frame 11 and the resin ring 12 are chamfered and contact each other as shown in FIGS. As for the 2nd main body frame 11, the upper corner | angular part of a cylindrical part is chamfered. The resin ring 12 has an inner diameter Da that is substantially the same as the outer diameter of the fitting portion 7b, and rotatably supports the second main body frame 11. As shown in FIG. 12, the resin ring 12 has a substantially triangular cross section when cut by a plane parallel to the central axis, and the chamfered surface 11 b of the second main body frame 11 and the resin ring 12. The chamfered surface 12a is in surface contact. The resin ring 12 is formed of a wear-resistant material like the resin ring 8. In addition, the resin ring 12 is partially cut to prevent a problem of dimensional change due to a change in environmental temperature.

  As shown in FIG. 7, the fixed plate 15 has a disk shape, and has two coaxial counterbores on one side. As shown in FIG. 6, the circular counterbore 15 a having a small diameter is formed to have an inner diameter substantially the same as the outer diameter Da of the rotating shaft member 7. The circular counterbore 15b having a large diameter is formed so as to have an inner diameter that is substantially the same as the outer diameter of the resin ring 12, the wave washer 13, and the resin washer 14, and the resin ring 12, the wave washer 13 and the resin washer 14 are formed. The screw 16 is fixed to the front end surface 7c of the rotary shaft member 7 by being screwed into the hole 7g of the front end surface 7c of the rotary shaft member 7 with a screw 16. Since the resin ring 12 has a chamfered surface 12a, pressing the fixing plate 15 along the optical axis 6 in the direction of the flange portion 7a of the rotary shaft member 7 causes the resin ring 12 to have a chamfered surface 12a. The chamfered surface 11b of the second main body frame 11 is configured to be in close contact.

  As shown in FIG. 7, the wave washer 13 has a shape obtained by cutting out a resilient plate material such as so-called stainless steel into a circular shape and deforming it in the axial direction. The wave washer 13 has, for example, a three-crest shape. The wave washer 13 has a height that allows the wave washer 13 to bend to an appropriate amount by fixing the fixing plate 15.

  The resin washer 14 is formed in a ring shape using a wear-resistant material such as polyacetal resin. The seal 17 has a circular shape and is affixed on the fixing plate 15 with a double-sided tape or the like.

  In this configuration, the wave washer 13 is deflected by fixing the fixed plate 15 to the distal end surface 7 c of the rotary shaft member 7, and this deflection causes the wave washer 13 and the flange portion 7 a of the rotary shaft member 7 to bend. A pressing force in the direction of the flange portion 7a is applied to the inserted component. Thus, the first main body frame 9 can be rotated coaxially with the optical axis 6 by the support of the resin ring 8 outside the rotating shaft member 7. The second main body frame 11 can also be rotated coaxially with the optical axis 6 by the support of the resin rings 10 and 12.

  Thus, in the eye width adjustment mechanism of the first embodiment, the rotary shaft member 7 rotatably supports both the first main body frame 9 and the second main body frame 11 via the resin rings 8, 10, 12. Therefore, it is difficult for the observation image to be shifted when the microscope 100 is operated.

  Further, in the eye width adjustment mechanism of the first embodiment, the notch portion 7e is obtained by notching the base end portion side surface 7h and the tip end side surface 7i of the substantially cylindrical portion of the rotating shaft member 7 over a half circumference from different sides. , 7f is enlarged, and the eye width can be adjusted to both the upper side and the lower side in the figure as indicated by the arrows in FIG. Therefore, according to the configuration of the first embodiment, the eye width can be adjusted smoothly according to the height of the user, so that the eye point at the time of observation can be selected flexibly, and the usability of the microscope is improved.

  In the eye width adjustment mechanism of the first embodiment, the chamfered surface 9a is provided on the first main body frame 9, and the chamfered surfaces 11a and 11b are provided on the second main body frame 11, and each chamfer is provided. The chamfered surfaces 9a, 11, 11b and the chamfered resin rings 8, 10, 12 are brought into contact with the chamfered surfaces of the main body frames in a freely rotatable manner. Therefore, in the eye width adjustment mechanism of the first embodiment, each main body frame rotates on the chamfered surfaces 8a, 10a, and 12a of the resin rings 8, 10, and 12 by the chamfered surfaces 9a, 11, and 11b. Therefore, even if an external force is applied for eye width adjustment and observation, the external force is efficiently converted into rotation. Therefore, in the eye width adjusting mechanism of the first embodiment, the notch portions 7e and 7f of the rotary shaft member 7 are provided so that the eye width can be adjusted to both the upper side and the lower side in the drawing as indicated by the arrows in FIG. Even if it is increased, the rotary shaft member 7 can sufficiently withstand the applied external force, and there is no problem in use as a product.

  Further, since the eye width adjustment mechanism of the first embodiment uses a mirror instead of a prism, the cost can be reduced as compared with a configuration using a prism.

  In the configuration of the first embodiment, three resin rings 8, 10, and 12 are used, but three resin rings are not necessarily used. For example, when the spring constant of the wave washer 13 is increased, the first main body frame 9 and the second main body frame 11 can be strongly pressed against the flange portion 7a of the rotary shaft member 7, so that the resin rings 8 and 12 are omitted. A configuration in which only the resin ring 10 is used may be employed. What is necessary is just to select the location which uses a resin ring in consideration of the amount of operation force of eye width adjustment, and the eccentricity of a main body frame.

(Embodiment 2)
Next, a second embodiment will be described. The microscope in the second embodiment has a configuration similar to that shown in FIG. FIG. 13 is a diagram in which the binocular portion of the binocular tube according to the second embodiment is partly cut from the top around the rotation axis of the eye width adjustment mechanism. FIG. 14 is an enlarged view of region A21 in FIG. FIG. 15 is an enlarged view of region A22 in FIG. FIG. 16 is an enlarged view of region A23 in FIG.

  As shown in FIG. 13, in the second embodiment, instead of the rotary shaft member 7, the rotation between the flange portion 7a and the fitting portion 7b is different from that of the rotary shaft member 7 shown in FIG. A shaft member 207 is provided. In the second embodiment, a resin ring 10 </ b> A is provided instead of the resin ring 10. The second embodiment has a configuration in which a fixed plate 215 is provided instead of the fixed plate 15, and a plurality of metal balls 12A are arranged in place of the wave washer 13 and the resin washer 14.

  As shown in FIGS. 13 and 14, the rotary shaft member 207 is formed with an inclined surface 7j that contacts the chamfered surface 9a of the first main body frame 9 between the flange portion 7a and the fitting portion 7b. ing. By pressing the first main body frame 9 along the optical axis 6 in the direction of the flange portion 7a of the rotary shaft member 207, the chamfered surface 9a of the first main body frame 9 and the inclined surface 7j of the rotary shaft member 207 are obtained. Is in close contact with each other. A lubricant such as grease is applied to the inclined surface 7j to prevent the chamfered surface 9a of the first main body frame 9 and the inclined surface 7j of the rotary shaft member 207 from being worn. It can be rotated smoothly.

  As shown in FIGS. 13 and 15, the resin ring 10 </ b> A is disposed between the second main body frame 11 and the rotation shaft member 207 and rotatably supports the second main body frame 11. The resin ring 10 </ b> A has a circular cross section when cut along a plane parallel to the central axis of the resin ring 8. The inner diameter of the resin ring 10 </ b> A has substantially the same inner diameter as the outer diameter of the fitting portion 7 b of the rotating shaft member 207. Resin ring 10A is formed of a wear-resistant material such as polyacetal resin. Further, the resin ring 10A is partially cut to prevent a problem of dimensional change due to a change in environmental temperature. When the second body frame 11 is pressed along the optical axis 6 in the direction of the flange portion 7a of the rotary shaft member 207, the resin ring 10A and the chamfered surface 11a of the second body frame 11 are in close contact with each other. Yes.

  As shown in FIGS. 13 and 16, the fixing plate 215 has two coaxial counterbores on one side, like the fixing plate 15. Similar to the fixed plate 15, the circular counterbore 215 a having a small diameter is formed so as to have an inner diameter substantially the same as the outer diameter Da of the rotating shaft member 7. The circular counterbore 215b having a large diameter is set to a depth at which the metal ball 12A can press the chamfered surface 11b of the second body frame 11 when the fixing plate 215 is fixed to the rotating shaft member 207.

  In this configuration, the fixing plate 215 is fixed to the distal end surface 7c of the rotary shaft member 207, so that the component inserted between the metal ball 12A and the flange portion 7a of the rotary shaft member 207 is in the direction of the flange portion 7a. A pressing force is applied. Thus, the first main body frame 9 can be rotated coaxially with the optical axis 6 by the support of the rotating shaft member 207 by close contact with the inclined surface 7j. The second main body frame 11 can also rotate coaxially with the optical axis 6 by being supported by the rotating shaft member 207 via the metal ball 12A.

  Therefore, according to the configuration of the second embodiment, the same effects as those of the first embodiment can be obtained, and the resin ring 8 used in the configuration of the first embodiment can be omitted. The cost can be reduced and the assembly of the binocular part can be facilitated.

  In the first embodiment, the accuracy of the chamfer angle is required in the resin ring 10, but in the configuration of the second embodiment, the accuracy is required because the resin ring 10A having a circular cross section may be used as it is. The cost can be reduced as compared with the parts.

  Further, in the configuration of the second embodiment, since the spherical metal ball 12A is used instead of the resin ring 12, the rotation of the first main body frame 9 and the second main body frame 11 can be further facilitated.

  In the first and second embodiments, the components of the binocular eye width adjustment mechanism may be changed. For example, in the first and second embodiments, the resin ring 10A may be used instead of the resin rings 8, 10, 12 and the metal ball 12A. In this way, the components of the binocular eye width adjustment mechanism may be changed in consideration of processing and assemblability while adjusting to the desired eye width adjustment power.

  Further, in order to obtain the same effects as those of the first and second embodiments, a shape having a centripetal effect may be formed in any one of them, the chamfered surface 9a of the first main body frame 9, the second main body frame It is not limited to the 11 chamfered surfaces 11a and 11b, but it is sufficient if there are portions that support at least three points along the optical axis in the concentric shape of the cylindrical portions of the rotary shaft members 7 and 207.

DESCRIPTION OF SYMBOLS 1 Microscope main body 2c Outer frame 2 Lens barrel 2a Binocular part 3a Revolver 3b Focusing handle 3 Objective lens 4 Stage 5 Condenser 6 Optical axis 7,207 Rotating shaft member 8, 10, 10A, 12 Resin ring 9 1st main body frame 11 1st 2 body frame 12A metal ball 13 wave washer 14 resin washer 15,215 fixed plate 16 screw 17 seal 18 beam splitter 19 first mirror 20 second mirror 21 third mirror 22 first eyepiece 23 second eyepiece lens 100 microscope 120 rotation Axis 121, 122 Prism stand 123, 124 Fixed plate 125, 126 Prism 131 Flange 132, 133 Opening 200 Optical axis 206 Lens barrel arm 207 Rotating shaft member 211 Lens barrel arm

Claims (7)

In the binocular tube that can adjust the eye width,
A first eyepiece;
A second eyepiece;
A first optical system comprising a beam splitter and a first mirror for branching a light beam from the outside, and guiding one light beam branched by the beam splitter to the first eyepiece by reflection of the first mirror;
A first main body frame containing the first optical system;
A second optical system that includes a second mirror and a third mirror, and guides the other light beam branched by the beam splitter to the second eyepiece by reflection of the second mirror and the third mirror When,
A second body frame containing the second optical system;
A rotating shaft member that rotatably fits the first main body frame and the second main body frame;
A first resin ring disposed between the second main body frame and the rotary shaft member and rotatably supporting the second main body frame;
With
The binocular tube, wherein the second main body frame is chamfered at some corners on the rotating shaft member side. The second body frame and the first ring are chamfered with each other;
The binocular tube according to claim 1, wherein the chamfered surface of the second main body frame and the chamfered surface of the first resin ring are in surface contact.   2. The binocular tube according to claim 1, wherein the chamfered surface of the second main body frame and the first resin ring are in point contact. The rotating shaft member has a substantially cylindrical portion,
The binocular tube according to any one of claims 1 to 3, wherein a distal end side surface and a proximal end side surface of the substantially cylindrical portion of the rotating shaft member are cut out over a half circumference or more from different sides. .   The binocular tube according to any one of claims 1 to 4, wherein the first main body frame is chamfered at some corners on the rotating shaft member side. A second resin ring disposed between the first body frame and the rotary shaft member and rotatably supporting the first body frame;
The second resin ring is chamfered,
The binocular tube according to claim 5, wherein the chamfered surface of the first main body frame and the chamfered surface of the second resin ring are in surface contact.   The binocular tube according to claim 5, wherein the rotating shaft member is formed with an inclined surface that contacts a chamfered surface of the first main body frame.

Images