JPH1039229A - Sighting mechanism for microscope focus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a focusing mechanism of a microscope capable of easily changing over at the time of focusing and observation by a simple operation and surely fixing a focusing part on a focusing position without adjusting the amount of rotating force of a focusing handle heavily. SOLUTION: In the focusing mechanism of a microscope for vertically moving a focusing part 10 by the engaging motion of a rack 19 and a pinion 13, this mechanism is provided with at least one of pinion fixing members 13c formed integrally with a rack fixing member 21 and the pinion 13 formed integrally with the rack 19 and parking means 14, 15, 17 for parking the focusing part 10 on the focusing position. By moving a focusing handle 4 for operating the focusing mechanism to the direction of the axis of the relevant focusing handle 4, the parking means 14, 15, 17 are operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focusing mechanism of a microscope, and more particularly, to a means for stopping a focusing unit at a focusing position.

[0002]

2. Description of the Related Art Conventionally, as a focusing mechanism of a microscope, a mechanism using a rack and a pinion is generally known.
In this type of focusing mechanism, there is often a problem that the lens barrel descends due to the weight of the lens barrel or a force applied to the lens barrel by an observer, and the focus is blurred during observation or photographing. . On the other hand, in a conventional microscope, a method of preventing the descent by adjusting the amount of operating force of the focusing mechanism heavily is adopted. A focusing mechanism of a conventional microscope will be described with reference to FIGS. FIG. 16 is a schematic configuration diagram of a conventional microscope, and FIG. 17 is a cross-sectional view of the focusing mechanism of the microscope viewed from an arrow A in FIG. In FIG. 16, a lens barrel 110 is mounted on a stand 101 as a mirror body so as to be vertically movable. The stand 101 is provided with a left focusing handle 104 and a right focusing handle 107 for vertically moving the lens barrel 110 with the optical axis 112 as a symmetric axis.

In FIG. 17, a microscope stand 101 is shown.
The bearings 101a and 101b have a pinion 10
Two shafts are pivoted. A left focusing handle 104 is screwed integrally with a left end of the pinion 102 via a washer 103. A right focusing handle 107 is elastically screwed to the right end of the pinion 102 via a washer 105 and a disc spring 106. That is, by rotating the right focusing handle 107 while fixing the left focusing handle 104, the pinion 102
The right focusing handle 107 can be moved forward and backward in the direction of the rotation axis 108, and the elastic force of the disc spring 106 can be adjusted. Also, the rack 10 meshed with the pinion 102
9 is integrally fixed to a lens barrel 110 equipped with an optical system of a microscope, and the lens barrel 110 is mounted on a stand 101 via a linear guide 111 so as to be vertically movable.

In the focusing mechanism of the microscope having the above configuration,
When using the microscope normally, the left focusing handle 104
, The right focusing handle 107 is rotated, and the disc spring 106 is used in a slightly crushed state. In this state, the pinion 102 and the right focusing handle 107 can be integrally rotated by the elasticity of the disc spring 106 in the crushed state, and the left focusing handle 10
4 and the end face of the right focusing handle 107 and the stand 101
A frictional resistance is generated between the left and right side surfaces, and the rotational force of the left and right focusing handles 104 and 107, that is, the rotational force of the pinion 102 is increased. Here, if the left focusing handle 104 or the right focusing handle 107 is rotated, the pinion 102 rotates integrally therewith, and the rack 109 meshing with the pinion 102 is sent out upward or downward, and The lens barrel 110 to which the body 109 is integrally fixed can move upward or downward to focus.

[0005] In this state, since the rotational force of the pinion 102 is heavy, the pinion 102 does not rotate due to the weight of the lens barrel 110. When a heavy object such as a photographing device or a TV photographing device is mounted on the lens barrel 110 and used, the right focusing handle 107 is rotated and the amount of crushing of the disc spring 106 is increased. Of the focusing handles 104 and 107, that is, the rotation force of the pinion 102 is heavily adjusted. As a result, even when a system such as a photographing device or a TV photographing device is mounted on the lens barrel 110 for use, the pinion 102 is prevented from rotating and the lens barrel 110 is lowered.

[0006]

However, in the prior art focusing mechanism of a microscope, the rotational force of the focusing handle is heavily adjusted in order to prevent the lens barrel from lowering due to its own weight. There was a problem in that the steering wheel turning amount during the quasi-operation became very heavy, making it difficult to operate. In addition, it is necessary to rotate the focusing handle to adjust the amount of rotational force according to the weight of the system mounted on the lens barrel, which is a very cumbersome operation. In addition, although the said problem demonstrated the microscope which carries out focusing operation by moving a lens barrel up and down,
Even in microscopes where focusing is performed by moving the stage up and down,
Exists as well.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention according to claims 1, 2, or 3 is to adjust the amount of rotation of the focusing handle without heavily adjusting the amount of rotation.
An object of the present invention is to provide a focusing mechanism of a microscope that can easily switch between focusing and observation with a simple operation and that can reliably fix a focusing unit at a focusing position.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1, 2 or 3 is a microscope in which a focusing unit is moved up and down in the optical axis direction by a meshing movement of a rack and a pinion. In the focusing mechanism, at least one of a rack fixing member formed integrally with the rack and a pinion fixing member formed integrally with the pinion, and parking means for holding the focusing section at a focus position Wherein the parking means is operated by moving a focusing handle for operating the focusing mechanism in the axial direction of the focusing handle.

In the operation of the first, second, or third aspect of the present invention, at least one of a rack fixing member formed integrally with the rack and a pinion fixing member formed integrally with the pinion, and the focusing portion is focused. Parking means for parking at a position, and moving the focusing handle for operating the focusing mechanism in the axial direction of the focusing handle, thereby operating the parking means. During focusing, the focusing handle can be operated with a small amount of torque, and during observation, the focusing section is parked at the focusing position by moving the focusing handle in the axial direction. In the operation of the invention according to claim 2, in addition to the above operation, the stopping means is constituted by pressure contact means for press-contacting the rack fixing member and the pinion fixing member, so that the frictional force between the rack fixing member and the pinion fixing member causes The focusing unit is parked. In the operation of the invention according to claim 3, in addition to the above-mentioned operation, the means for operating the parking means is an elasticity pinched between the pinion holding the focusing handle and the focusing axis pivotally supported by the mirror body. A guide cylinder surrounding the pinion and fixed to the mirror body and having a plurality of grooves, and a guide claw mounted on the pinion and rotatably fitted into the groove of the guide cylinder. With this configuration, the focusing handle is moved until the guide claw pivots from the groove of the guide cylinder to the groove, and the parking means of the focusing unit is operated.

[0010]

1 to 3 show a first embodiment of the present invention. FIG. 1 is a horizontal sectional view of a focusing mechanism at the time of focusing, and FIG. 2 is a horizontal sectional view of the focusing mechanism at the time of observation. , FIG.
FIG. 2 is a vertical sectional view seen from the direction of arrow B in FIG.

In FIGS. 1 and 2, a pinion 1 made of brass is provided on a right bearing 1a of a stand 1 which is a mirror body.
The right end shaft 3 is pivotally supported. A flange portion 13a is formed on a shaft portion of the pinion 13, and a right focusing handle 7 is resiliently screwed through a washer 5 and a disc spring 6 with the stand 1 sandwiched therebetween. Further, a pinion fixing member 13c is integrally formed in the vicinity of the gear portion 13b of the pinion 13, and further on the left end portion,
A fitting hole 13d into which the focusing shaft 14 is fitted so as to freely advance and retreat, and an elongated hole 13e in which the rotation regulating pin 16 slides are formed.

The left bearing 1b of the stand 1 has
The focusing shaft 14 is pivotally supported so as to be able to advance and retreat in the axial direction. The left focusing handle 4 is integrally screwed to the left end of the focusing shaft 14. On the outer periphery of the focusing shaft 14, for example, a groove 14a having a V-shaped or U-shaped cross section is formed, and a spring receiver 15 is screwed integrally. The right end of the focusing shaft 14 is formed to be one step thinner, supported by the fitting hole 13d of the pinion 13, and the rotation regulating pin 16 press-fitted into the focusing shaft 14 is slidable in the elongated hole 13e of the pinion 13. Is engaged. That is, the focusing shaft 14 and the pinion 13 rotate in conjunction with each other in the rotation direction, and the rotation regulating pin 16 is
e is configured to slide freely over a distance that can be moved. The spring receiver 15 has a coil spring 17 as an elastic member.
Is engaged with the other end of the coil spring 17 and the pressing member 18 is engaged. The inner diameter of the pressing member 18 is fitted on the left end shaft of the pinion 13.

On the other hand, the rack 19 meshing with the pinion 13 is provided with a lens barrel 10 as a focusing unit equipped with a microscope optical system.
The lens barrel 10 is attached to the stand 1 via a linear guide 11 so as to be vertically movable. A thin plate-shaped rack fixing member 21 made of a brass plate is fixed to a side surface of the rack 19 with a mounting screw 20. As shown in FIG. 3, a long hole 21 a is formed at the tip of the rack fixing member 21, and the left end shaft portion of the pinion 13 is inserted therethrough. Further, as shown in FIGS. 1 and 2, the rack fixing member 21 includes a pressing member 18 and a pinion fixing member 13.
c. A fixing pin 22 is provided in a hole 1c formed in the left bearing 1b of the stand 1.
Are fixed so as to be able to advance and retreat.
Is pressed in the direction of the focusing axis 14. Further, the lid 24 is fixed to the stand 1 to suppress the spring 23 from protruding to the outside. Further, a knob 25 is fixed to the fixing pin 22 by adhesion.

Here, as shown in FIG. 1, when the focusing shaft 14 is moved to the left, that is, when the coil spring 17 is extended, the pressing member 18 and the rack fixing member 21 and the pinion fixing member 13c are interposed. A gap G is formed. Further, as shown in FIG. 2, in a state where the focusing shaft 14 has moved to the right, that is, in a state where the coil spring 17 is compressed, the elastic force of the coil spring 17 causes the rack fixing member 2 to move.
1 is slightly bent, and the pressing member 18 and the rack fixing member 2
1 and the pinion fixing member 13c are configured to be in close contact with each other. Further, the tip of the fixed pin 22 is fitted into the groove 14 a of the focusing shaft 14, and serves as a stopper so that the focusing shaft 14 does not recede due to the elastic force of the coil spring 17.

Next, the operation of the focusing mechanism having the above configuration will be described with reference to FIGS. At the time of the focusing operation, as shown in FIG. 1, the left focusing handle 4 is in the left direction, and the coil spring 17 is in an extended state. In this state, since the elastic force of the coil spring 17 does not act on the pressing member 18, the pressing member 18 and the rack fixing member 21
A gap G is formed between the pinion 13 and the pinion fixing member 13c. Since the pinion 13 is only affected by the elastic force of the disc spring 5, the rotation of the focusing handle for the focusing operation is performed. Can be performed smoothly. On the other hand, at the time of observation or photography, when the left focusing handle 4 is pushed in the direction of arrow C, the fixing pin 22 falls into the groove 14a, and the coil spring 17 is compressed by the spring receiver 15, as shown in FIG. The force is transmitted to the pressing member 18. Here, since the rack fixing member 21 is thin, it bends,
The pressing member 18, the rack fixing member 21 and the pinion fixing member 13c are in close contact with each other, whereby the rack 19 and the pinion 13 are firmly fixed, and the lens barrel 10 is parked at the focus position.

When the focusing operation is performed again, the fixing pin 22 is disengaged from the groove 14a of the focusing shaft 14 by pulling the knob 25 in the direction of arrow D. Since the elastic force is acting, the focusing axis 14 moves in the direction of arrow E, and returns to the state shown in FIG. In this state, since the pinion 13 can rotate freely, a smooth focusing operation becomes possible. If the amount of rotation of the focusing handle is too light or too heavy, the left focusing handle 4 is fixed and the right focusing handle 7 is rotated as in the case of the conventional microscope. The amount of crushing can be adjusted to set a desired amount of rotational force. Preferably, if the amount of rotational force of the focusing handle is adjusted to such an extent that the lens barrel does not drop abruptly, the knob 2
5 by pulling the rack 19 and the pinion 13
When the fixing of the lens barrel is released, it is possible to prevent the lens barrel from dropping abruptly and the focusing position from moving largely.

According to the first embodiment of the present invention, the lens barrel can be securely fixed at the time of microscopic observation or photographing.
Even when a system such as a heavy photographing device or a TV photographing device is mounted on the lens barrel or an external force is applied by an observer, the lens barrel does not move and the focus is not defocused. Further, at the time of the focusing operation, the fixing of the lens barrel is released, and the focusing can be performed smoothly. Further, since the focusing unit can be fixed and released only by pushing and pulling the handle and the knob, the operation is easy.

In the first embodiment of the present invention, the pinion fixing member is formed integrally with the pinion. However, the present invention is not limited to this. For example, the pinion is formed of a material having high mechanical strength, such as steel, and the pinion fixing member is formed. Copper alloys such as brass, phosphor bronze, etc., which provide a large fixing force for the members and have good wear resistance,
An aluminum alloy or a synthetic resin material such as PPS resin or polyamide imide may be used, and both may be integrally joined by means such as screwing or press fitting. Similarly, the rack fixing member is formed separately and screwed to the rack. However, the present invention is not limited to this. A rack fixing member formed of an elastic material may be bonded or welded to the rack, or may be inserted or welded. It may be integrated by outsert molding.
When the rack and the rack fixing member may be formed of the same material, a metal or a synthetic resin may be integrally formed by a die casting method, an injection molding method, or the like.

Further, in the first embodiment of the present invention, the pinion and its peripheral members are disposed on the right side of the stand as the mirror body, and the focusing axis and its peripheral members are disposed on the left side. The arrangement may be different. In addition, the pinion and the focusing axis have a structure in which a rotation regulating pin press-fitted into the focusing axis slides in an elongated hole formed in the pinion, but instead of the elongated hole, a slot groove is used. In this case, it is not necessary to fit the pinion and the focusing shaft and then press-fit the rotation regulating pin into the focusing shaft through the elongated hole. Still further, in the first embodiment of the present invention, a microscope in which the lens barrel as a focusing unit moves up and down to perform a focusing operation has been described as an example. However, the lens barrel is fixed, and a stage for mounting a sample is described. The focusing mechanism shown in the first embodiment of the present invention can be applied to a microscope having a focusing unit of a type in which a focusing operation is performed by moving up and down, and the same operation and effect can be exhibited. it can.

[0020]

Second Embodiment FIGS. 4 to 12 show a second embodiment of the present invention. FIG. 4 is a horizontal sectional view of a focusing mechanism at the time of focusing, and FIG. 5 is a view at the time of shifting from focusing to observation. FIG. 6 is a horizontal cross-sectional view of the focusing mechanism at the time of observation, FIG. 7 is a vertical cross-sectional view as viewed from the direction of arrow F in FIG. 4, FIG. 8 is a front cross-sectional view of the first guide claw, and Right side view,
FIG. 9 is a front sectional view and a left side view of the second guide claw, and FIG.
0 is a front cross-sectional view and a right side view of the guide cylinder, FIG. 11 is a developed view of the inner surface of the guide cylinder, and FIG. 12 is a developed view showing an engagement relationship between the first guide claw, the second guide claw, and the guide cylinder. A part of the focusing mechanism according to the second embodiment of the present invention uses the same members as those of the focusing mechanism according to the first embodiment of the present invention, and the same members are denoted by the same reference numerals. Is omitted.

4 to 6, a focusing shaft 8 is pivotally supported on the right bearing 2a of the stand 2. Focusing axis 8
Is formed with a flange portion 8a at the outer diameter portion, and the washer 5 and the disc spring 6
The right focusing handle 7 is resiliently screwed in via.
At the left end of the focusing shaft 8, a fitting hole 8b into which the pinion 9 is fitted to be able to move forward and backward, and an elongated hole 8c into which the rotation regulating pin 27 slides are formed. A shaft portion of a pinion 9 made of brass is pivotally supported on the left bearing portion 2b of the stand 2 so as to be able to advance and retreat in the axial direction. The left focusing handle 4 is screwed integrally with the left end of the pinion 9. In the vicinity of the gear portion 9a of the pinion 9, a pinion fixing member 9b having a tapered shape concentric with the axis of the pinion 9 is integrally formed.

On the other hand, the rack 3 meshed with the pinion 9
Reference numeral 3 is made of brass and is integrally fixed to a lens barrel 10 as a focusing unit equipped with a microscope optical system. The lens barrel 10 is mounted on a stand 2 via a linear guide 11 so as to be vertically movable. In the vicinity of the pinion fixing member 9b on the side of the rack 33, a rack fixing member 33a is formed integrally with the rack 33. As shown in FIG. 7, the portion of the rack fixing member 33a that is pressed against the pinion fixing member 9b is formed in a long hole tapered shape.

As shown in FIGS. 4 to 6, the right end of the pinion 9 is formed to be one step narrower, and is supported by the fitting hole 8 b of the focusing shaft 8, and the rotation restricting pin 27 press-fitted into the pinion 9 is provided. , Is slidably engaged with the elongated hole 8 c of the focusing shaft 8. In other words, the focusing shaft 8 and the pinion 9 rotate in conjunction with each other in the rotational direction, and slide freely over a distance in which the rotation regulating pin 27 can move through the elongated hole 8c in both axial directions. It is configured. A coil spring 34 is mounted between the pinion 9 and the focusing shaft 8, and presses the pinion 9 in the direction of the rack fixing member 33a.

A first pinion 9 is formed on a shaft portion of the pinion 9.
A retaining ring 28 is inserted into each of the groove 9c and the second groove 9d, and a disc spring 29, a first guide claw 30, and a second guide claw 31 are mounted therebetween. Here, the disc spring 29 is assembled in a state where it is slightly crushed by the two retaining rings 28, and the first guide claw 30 and the second guide claw 31 have an elastic force in a direction in which they contact each other. Working. A guide cylinder 32 is integrally fixed to the inner wall of the stand 2 by, for example, bonding or welding, and a first guide claw 30 is provided in a groove formed in the inner diameter of the guide cylinder 32.
And the second guide claw 31 is fitted.

The detailed shapes of the first guide claws 30, the second guide claws 31, and the guide cylinder 32 will be described with reference to FIGS. In FIG. 8, a hole 30 a through which the shaft of the pinion 9 is inserted is bored inside the first guide claw 30, and claws 30 b are erected at each of six equally spaced positions outside the first guide claw 30. At the tip of the claw portion 30b, a gently sloped convex portion 30c is formed. Also, in FIG. 9, the second guide pawl 31
A hole 31a through which the shaft portion of the pinion 9 is inserted is formed inside, and the claw portion 31b is provided at each of three equally divided positions on the outside.
Is provided on the end face of the claw portion 31b.
0c is formed. Here, the width dimension m of the claw portion 31b of the second guide claw 31 is the same as the width size n of the first guide claw 30, and the claw portion 31b of the second guide claw 31
Is longer than the length q of the first guide claw 30.

In FIG. 10, a guide cylinder 32 has a cylindrical shape, and a first guide claw 30 and a second guide claw 31 are provided at every other three positions of the inner diameter equally divided into six. A deep groove portion 32 a having a groove width slightly larger than the claw widths m and n of the second guide claw and an inner diameter slightly larger than the outer diameter of the second guide claw 31 is formed. Further, at every other three places, shallow groove portions 32c having the same groove width as the deep groove portion 32a and having an inner diameter slightly larger than the outer diameter of the first guide claw 30 are formed. Further, as shown in the developed view of the inner surface of FIG. 11, the abutting surface 32d is formed in the shallow groove portion 32c, and the boundary in the radial direction matches the inner diameter of the deep groove portion 32a. Furthermore, the position of the abutment surface 32d is set to be slightly shallower than the height h of the second guide claw 31 at a depth in the axial direction from the right end surface. Further, the deep groove portion 32a and the shallow groove portion 32
An inclined surface 32b is formed on the right end surface side of c.

The operation of the focusing mechanism will be described with reference to FIGS. 4 to 6 and FIG. At the time of focusing operation, FIG.
As shown in FIG. 4A, the claw portion 31b of the second guide claw 31 is in contact with the abutment surface 32d of the guide tube 32, so that the pinion fixing member 9b of the pinion 9 and the rack 33 as shown in FIG. Is held apart from the rack fixing member 33a, and the pinion 9 can rotate freely. On the other hand, the left focusing handle 4
Is pushed in the direction of arrow G, the shallow groove 3
The first guide claw 30 and the second guide claw 31 housed in 2c move integrally, and the second guide claw comes off from the shallow groove 32c of the guide cylinder 32 as shown in FIG. In this state, since the resilient force acts on the second guide claw 31 and the first guide claw 30 in the direction in which they come into contact with each other by the disc spring 29, as shown in FIG.
Is slightly rotated in the direction of the arrow by the slope 31c.

Next, when the force for pushing the left focusing handle 4 in FIG. 4 in the direction of arrow G is released, the pinion 9
Since it receives the elastic force of the coil spring 34, it moves in the direction of arrow H shown in FIG. At this time, as shown in FIG. 12C, the second guide claw 31 is guided to the groove adjacent to the guide cylinder 32 along the inclined surface 32b of the guide cylinder 32. Since the adjacent groove is the deep groove portion 32a, the first guide claw 30 and the second guide claw 31 are in contact with each other while being in contact with each other.
As shown in (d), the pinion 9 further moves in the direction of the arrow H, and the pinion fixing member 9b of the pinion 9 and the rack fixing member 33a of the rack 33 are joined, and the pinion 9 and the rack 33 are firmly fixed. You.

When the focusing operation is performed again, FIG.
When the left focusing handle 4 is pushed again in the direction of arrow G and then opened, the second guide claw 31 is guided from the deep groove 32a of the guide cylinder 32 to the adjacent shallow groove 32c, as described above. As shown in FIG. 12A, the second guide claw 31 comes into contact with the abutment surface 32d of the guide cylinder 32 and stops. In this state, since the pinion fixing member 9b of the pinion 9 and the rack fixing member 33a of the rack 33 are held apart, the pinion 9 can rotate freely.

According to the second embodiment of the present invention, similarly to the first embodiment of the present invention, at the time of microscopic observation and photographing,
Since the lens barrel can be fixed securely, a system such as a heavy-weight photographing device or TV shooting device can be installed in the lens barrel,
Even if an external force is applied by an observer's operation, the problem that the lens barrel moves and the focus is out of focus does not occur. Also,
At the time of the focusing operation, the fixing of the lens barrel is released, and the focusing can be performed smoothly. In addition, fixation of focusing part,
Since the release can be performed only by pressing the focusing handle, the observer does not need to touch any part other than the focusing handle, and the operation is easier than in the first embodiment of the invention.

Also in the second embodiment of the present invention, the pinion fixing members 9b and 9 and the rack fixing members 3
Although the rack 3a and the rack 33 are formed integrally with each other, the present invention is not limited to this. The two are separately formed as in the first embodiment of the present invention, and the two are integrally connected by means such as screwing, welding, or press fitting. May be. Further, the selection of the material may be the same as in the first embodiment of the invention. further,
The right and left sides may be changed similarly to the first embodiment of the invention. Further, the second embodiment of the present invention can be applied to a microscope in which a stage for mounting a specimen moves up and down.

[0032]

Third Embodiment FIGS. 13 to 15 show a third embodiment of the present invention. FIG. 13 is a horizontal sectional view of the focusing mechanism at the time of focusing, and FIG. 14 is a horizontal sectional view of the focusing mechanism at the time of observation. FIG. 15 is a vertical sectional view seen from the direction of arrow J in FIG. The focusing mechanism according to the third embodiment of the present invention has the same basic configuration as that of the focusing mechanism according to the second embodiment of the present invention, and therefore, only different parts will be described. Omitted.

In FIG. 13 and FIG.
The pinion gear portion 35a is directly used as the fixing member of FIG.
As shown in the figure, a rack gear having the same tooth shape is integrally formed at a position symmetrical to the rack gear portion 36b with respect to the axis of the pinion 35. Other configurations are the same as those of the second embodiment.

Next, the operation of the third embodiment of the present invention will be described. At the time of the focusing operation, as shown in FIG. 13, the pinion gear portion 35a of the pinion 35 and the rack fixing member 36a are separated from each other, as in the second embodiment of the present invention. Can rotate. Next, at the time of microscopic observation or photography, as in the second embodiment of the present invention, the left focusing handle 4 is pushed in the direction of the arrow K and then opened, and the same operation as the second embodiment of the present invention is performed. As a result, as shown in FIG.
The fifth pinion gear 35a meshes with the rack gear of the rack fixing member 36a while also meshing with the rack gear 36b of the rack 36. Thus, the rotation of the pinion 35 is fixed by the rack gear portion 36b of the rack 36 and the rack gear of the rack fixing member 36a. When the focusing operation is performed again, the left focusing handle 4 is pushed again in the direction of the arrow K as in Embodiment 2 of the invention, and then released, the display returns to the state of FIG. 13 and the focusing operation is possible. Become.

According to the third embodiment of the present invention, in addition to the effects of the second embodiment, the rack and the pinion can be fixed.
Since the meshing of the gears is used, it can be fixed more firmly. Also in the third embodiment of the present invention, the modification described in the second embodiment of the present invention can be applied as it is.

In the first and second embodiments of the present invention, the pressing means for stopping the focusing unit includes the following contents. In other words, the pressing means for stopping the focusing unit not only prevents the focusing handle from moving when locked by sufficiently increasing the pressing force, but also does not move due to its own weight or external force. The pressing force may be set to such an extent that the handle is heavy but movable when moved. In this case, there is an advantage that the lock does not need to be released when the fine adjustment is performed after the lock. In this case, the operating force naturally becomes heavy, but it does not matter much for the minute fine adjustment. Also,
When a large moving amount is required, the lock may be released once.

[0037]

According to the first, second or third aspect of the present invention, the focusing handle can be operated with a small amount of rotational force during focusing, and the focusing handle can be moved in the axial direction during observation. By keeping the focusing unit at the focusing position with, without heavy adjustment of the turning force of the focusing handle,
Switching between focusing and observation can be easily performed by a simple operation, and the focusing unit can be reliably fixed at the focusing position. According to the second aspect of the present invention, in addition to the above-described effects, the focusing position is held with high precision by stopping the focusing unit by the frictional force between the rack fixing member and the pinion fixing member. According to the third aspect of the invention, in addition to the above effects, the focusing handle is moved until the guide claw pivots from the groove of the guide cylinder to the groove, and the parking means of the focusing unit is operated. By operating only the focusing handle, switching between focusing and observation can be performed.

[Brief description of the drawings]

FIG. 1 is a horizontal sectional view of a focusing mechanism when focusing according to Embodiment 1 of the present invention.

FIG. 2 is a horizontal sectional view of a focusing mechanism at the time of observation according to the first embodiment of the present invention;

FIG. 3 is a vertical sectional view of Embodiment 1 of the present invention as seen from the direction of arrow B in FIG. 1;

FIG. 4 is a horizontal sectional view of a focusing mechanism during focusing according to a second embodiment of the invention;

FIG. 5 is a horizontal cross-sectional view of the focusing mechanism at the time of transition from focusing to observation according to Embodiment 2 of the present invention.

FIG. 6 is a horizontal sectional view of a focusing mechanism at the time of observation according to a second embodiment of the invention;

FIG. 7 is a vertical sectional view of Embodiment 2 of the present invention as viewed from the direction of arrow F in FIG. 4;

FIG. 8 is a front sectional view and a right side view of a first guide claw according to a second embodiment of the present invention.

FIG. 9 is a front sectional view and a left side view of a second guide claw according to a second embodiment of the present invention.

FIG. 10 is a front sectional view and a right side view of a guide cylinder according to a second embodiment of the invention.

FIG. 11 is a developed view of the inner surface of the guide cylinder according to the second embodiment of the present invention.

FIG. 12 is a developed view showing an engagement relationship among a first guide claw, a second guide claw, and a guide cylinder according to the second embodiment of the present invention.

FIG. 13 is a horizontal sectional view of a focusing mechanism when focusing according to Embodiment 3 of the present invention.

FIG. 14 is a horizontal sectional view of a focusing mechanism at the time of observation according to a third embodiment of the invention;

FIG. 15 is a vertical sectional view of Embodiment 3 of the present invention as viewed from the direction of arrow J in FIG. 13;

FIG. 16 is a schematic configuration diagram of a conventional microscope.

17 is a cross-sectional view of the focusing mechanism of the microscope viewed from the arrow A in FIG. 16 of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stand 4 Left focusing handle 10 Lens barrel 13 Pinion 13c Pinion fixing member 14 Focusing axis 15 Spring receiver 17 Coil spring 18 Pressing member 19 Rack 21 Rack fixing member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Odashima 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Industrial Co., Ltd. (72) Takeshi Okada 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd.

Claims (3)

[Claims] 1. A focusing mechanism of a microscope for moving a focusing unit up and down in an optical axis direction by a meshing movement of a rack and a pinion, wherein the rack fixing member formed integrally with the rack and the pinion are formed integrally. Moving the focusing handle for operating the focusing mechanism in the axial direction of the focusing handle, comprising at least one of the pinion fixing members described above and parking means for parking the focusing section at the focusing position. Depending on the operation
A focusing mechanism for a microscope, wherein the focusing means is configured to operate the parking means. 2. A focusing mechanism for a microscope according to claim 1, wherein said parking means comprises pressure contact means for pressing said rack fixing member and said pinion fixing member. 3. The means for operating the parking means includes: an elastic member sandwiched between the pinion holding the focusing handle and a focusing shaft pivotally supported by the mirror; A guide cylinder surrounding and fixed to the mirror body and having a plurality of grooves; and a guide claw mounted on the pinion and rotatably fitted into the groove of the guide cylinder, wherein the guide cylinder and the guide claws are provided. The focusing mechanism for a microscope according to claim 1, wherein the focusing mechanism is configured to be controlled by a rotation position of the microscope.