JP2002350737A - Revolving nosepiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a revolving nosepiece which the deterioration of positioning accuracy and the generation of dust, permits easy exchanging of a wore detraining and positioning member and is improved in reliability and durability as a product. SOLUTION: This revolving nosepiece has a turning member 1 which is mounted with at least two objective lenses and moves these objective lenses respectively onto an observation optical axis m, a detraining and positioning mechanism which positions the objective lenses onto the observation optical axis m and a fixing member 4 which is fixed to a microscope body. The detaining and positioning mechanism comprises a positioning elastic member 6 which is screwed to the fixing member 4 and a detaining and positioning member 15 which is screwed to the turning member 1 and is detained to the positioning elastic member 6 at its front end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microscope objective lens conversion device, and more particularly to a locking mechanism for positioning an objective lens.

[0002]

2. Description of the Related Art First, a general objective lens conversion apparatus (conventional example 1) will be described with reference to FIGS. FIG. 8 is a longitudinal sectional view of the objective lens conversion device, and FIG. 9 is Z3 of FIG.
FIG. 10 is a view as seen from the arrow Z4 in FIG. In FIG. 8, a rotating member 101 is rotatably held by a fixed member 4 by a press ring 2 and a plurality of balls 3. The rotating member 101 is provided with a plurality of objective lens mounting screws 101a for mounting an objective lens (not shown), and the same number of click balls 5 are adhesively fixed to the outer periphery of the rotating member 101. On the other hand, a click spring 6 is screwed to the fixing member 4 with a screw 7 as shown in FIGS. When the click ball 5 is locked by the click spring 6, the corresponding objective lens mounting screw 101a
Are located on the observation optical axis m. As shown in FIG. 8, a turning ring 8 having a knurled shape formed on the outer periphery thereof is screwed around the outer periphery of the rotating member 101 to facilitate the rotation operation. A dovetail member 9 is fixed to the fixed member 4 by a bolt 10, and is attached to a microscope body (not shown) by a long dovetail 9 a provided on the dovetail member 9. The fixing member 4 and the dovetail member 9 constitute a fixing member. By rotating the rotating member 101, an arbitrary objective lens among the objective lenses screwed to the objective lens mounting screw 101a can be changed to the position of the observation optical axis m of the microscope.

Next, an objective lens conversion device (conventional example 2) having a centering mechanism will be described with reference to FIGS. FIG. 11 is a longitudinal sectional view of the objective lens conversion device, FIG. 12 is a view taken along the arrow Z5 in FIG. 11, and FIG.
It is an X sectional enlarged view. Since the conventional example has the same structural parts as the conventional example 1, the same members are denoted by the same reference numerals and description thereof will be omitted. The rotating member 201 is provided with a plurality of centering members 11 for mounting an objective lens (not shown), and the same number of click balls 5 are adhesively fixed to the outer periphery of the rotating member 201. On the other hand, as shown in FIG. 11, a click spring 6 is screwed to the fixing member 4 with a screw 7. The click ball 5 is positioned such that when it is locked by the click spring 6, the corresponding objective lens mounting screw 11a of the centering member 11 is on the observation optical axis m.

In FIG. 11, a centering member 11 has an objective lens mounting screw 11a at the center, and a rotating member 201.
The rotation member 201 is slidably held in a plane on the observation optical axis m of the rotation member 201 and orthogonal to the observation optical axis m by the holding member 12 screwed with the screw 13. On the other hand, the centering member 11 is composed of a pressing member 14 having a built-in compression spring 14a equally arranged around the observation optical axis m and two adjustment screws 1.
5 (see FIGS. 12 and 13), the optical axis of the objective lens attached to the objective lens attachment screw 11a and the observation optical axis m coincide with each other by moving the adjustment screw 15 forward and backward with a tool. The centering can be adjusted as follows. The surface pressed by the pressing member 14 and the adjusting screw 15 is inclined, and the centering member 11
The centering position is determined, and at the same time, it is pressed downward (in the direction of gravity) to prevent the change of the focus. With the above configuration, the centering can be adjusted so as to correct the eccentricity of the objective lens.

[0005]

However, the prior arts 1 and 2 have the following problems. That is, since the locking positioning mechanism is constituted by a click ball adhesively fixed to the rotating member and a click spring screwed to the fixing member by screws, regardless of whether the objective lens is mounted and used, A constant locking pressure is constantly applied, and wear is promoted even in an objective lens that is not used, which deteriorates positioning accuracy and generates dust. In addition, when the locking positioning member such as a click ball is worn, it is very difficult to replace the locking positioning member with a new one, so that the product itself must be purchased again. Also, since the locking pressure is always constant, the user has to keep using the locking pressure set in advance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the invention according to claim 1 or 2 is to prevent deterioration of positioning accuracy and generation of dust, and to provide a worn locking positioning member. It is an object of the present invention to provide an objective lens conversion device which can easily replace the lens and has improved reliability and durability as a product.

[0007]

In order to solve the above-mentioned problems, according to the first or second aspect of the present invention, at least two objective lenses are mounted, and each of the objective lenses is moved on an observation optical axis. In an objective lens conversion device having a member, a locking positioning mechanism for positioning the objective lens on the observation optical axis, and a fixing member fixed to a microscope main body, the locking positioning mechanism is screwed to the fixing member. The positioning elastic member is attached to the rotating member, and the locking positioning member is screwed to the rotating member and locked at the tip thereof to the positioning elastic member.

In the objective lens conversion device according to the first or second aspect of the present invention, the locking positioning mechanism includes a positioning elastic member screwed to the fixed member and a rotating member screwed to the positioning member at its tip. By using an elastic member and a locking positioning member for locking, the locking positioning member for positioning an unused objective lens is turned in a loosening direction to release the locking with the positioning elastic member and used. The microscope is used by setting so that only the locking positioning member of the objective lens can be locked.

In the objective lens changing device according to the second aspect of the present invention, in addition to the above-mentioned functions, the locking pressure between the elastic member for positioning and the locking positioning member can be set arbitrarily, so that the user desires. The locking positioning member is fixed at the position of the locking pressure, and a microscope is used.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments will be described.

(Embodiment 1) FIGS. 1 to 4 show Embodiment 1, FIG. 1 is a bottom view of an objective lens conversion device, FIG. 2 is a sectional view taken along the line EFG of FIG. 1, and FIG. FIG. 4 is a top view of the objective lens conversion device, and FIG. This embodiment is different only in the part related to the objective lens conversion device and the locking positioning mechanism of the conventional example 2, and the other parts are the same as the conventional example 2. Therefore, only the different parts will be described. The same reference numerals are given and the description is omitted. In addition, in order to simplify the description, the turning ring 8, the dovetail member 9, and the screw 10 are omitted, and the shape of the fixing member 4 is also illustrated in a simplified manner.

1 to 4, a rotating member 201 having a large diameter is used instead of the rotating member 201 (see FIG. 11) of the second conventional example, and a click ball 5 (see FIG. 11) of the second conventional example is used. Thus, the locking positioning member 15 is formed. As shown in FIG. 2, a tapped hole 1 a is formed from the lower surface side at six equal positions on the circumference of the rotating member 1 located below the distal end portion of the click spring 6 as a positioning elastic member. The tap hole 1a is formed with a tapered body protruding bottom surface 1b, and a through hole 1c passes through the center.

A locking positioning member 15 is provided in the tapped hole 1a.
The tip spherical surface 15a is formed in a hemispherical shape like the click ball 5, and a lower part of the tip spherical surface 15a is formed with a tapered contact surface 15b that contacts the trunk bottom surface 1b. Further, a hexagonal hole 15c is formed in the opposite surface of the tip spherical surface 15a, so that a hexagonal driver tool can be inserted. When the locking positioning member 15 is tightened with a hexagonal screwdriver, the contact surface 15b is
, The position of the tip spherical surface 15a protruding from the through hole 1c is reproduced. Further, when the locking positioning member 15 is tightened, the locking positioning member 15 does not become loose even if the objective lens is changed over a long period of time. The rotation positioning member 1, the click spring 6, the screw 7, and the locking positioning member 15 constitute a locking positioning mechanism. Thus, even when each objective lens is mounted, the locking positioning member 15 can be operated by the hexagonal driver tool.
Can be easily tightened or retracted to a position where the click spring 6 does not act. Other configurations are the same as in the second conventional example.

In the objective lens conversion device having the above structure, when the locking positioning member 15 is tightened by the hexagonal screwdriver tool, the locking of the objective lens corresponding to the locking positioning member 15 is reliably performed. Conversely, when the locking positioning member 15 is retracted to a position where the click spring 6 does not act by the hexagonal driver tool, the locking positioning of the objective lens corresponding to the locking positioning member 15 is not performed. That is, the setting of the locking positioning mechanism is released.

According to the present embodiment, since the setting of the locking positioning mechanism is released, unnecessary wear of the locking positioning mechanism of the objective lens that is not used can be prevented. As a result, it is possible to prevent deterioration of the positioning accuracy of the locking positioning mechanism and generation of dust. Further, since the worn locking positioning member 15 can be replaced, it is not necessary to replace the objective lens conversion device itself due to wear of the locking positioning member 15. Therefore, the reliability and durability of the objective lens conversion device as a product are improved, and a low-cost product can be provided to the user.

In this embodiment, the locking positioning member 15
Is fixed so that the contact surface 15b abuts on the torso bottom surface 1b and the position of the tip spherical surface 15a is reproduced. May be respectively flat. The position of the locking positioning member 15 does not necessarily have to be perpendicular to the click spring 6 as long as the position reliably acts on the click spring 6. In addition, the locking positioning member 15
Any shape can be used as long as it can reliably act on the click spring 6 and evacuate. For example, it may have a two-body structure of a member having a spherical surface at the tip and a set screw having an external thread on its outer shape.

(Embodiment 2) FIGS. 5 to 7 show Embodiment 2, FIG. 5 is a top view of an objective lens conversion device, FIG. 6 is a sectional view taken along the line EFG of FIG. 5, and FIG. FIG. 6 is a view on arrow Z2 of FIG. 5. In the present embodiment, a fixing screw for fixing the locking positioning member of the objective lens conversion device according to the first embodiment is added. Since the configuration is basically the same, the same reference numerals are given to the same members. The description is omitted.

In FIG. 5 to FIG. 7, a tap hole is formed in the outer periphery of the rotating member 1 to fix the locking positioning member 15 screwed to the rotating member 1, and an elastic member 16a is provided at the tip. The fixed fixing screw 16 is screwed, and the male screw of the locking positioning member 15 is pressed at the tip of the screw, thereby preventing loosening. The fixing screw 16 is operated by a small hexagonal screwdriver tool attached to the microscope. Other configurations are the same as those of the first embodiment.

In the objective lens conversion device having the above-mentioned configuration, the locking positioning member 15 is rotated by a hexagonal screwdriver tool to adjust the locking pressure of the click spring 6 at the locking positioning position according to the user's preference, thereby obtaining a desired one. Stop at the position
The position is fixed by the fixing screw 16. When the locking positioning member 15 corresponding to the unused objective lens is turned with a hexagonal screwdriver, the locking positioning member 15 is retracted to a position where the click spring 6 does not act, and is fixed by a fixing screw 16 at this position. The locking positioning of the objective lens corresponding to the locking positioning member 15 is not performed. That is, the setting of the locking positioning mechanism is released.

According to the present embodiment, in addition to the effect of the first embodiment, the locking pressure of the click spring at the locking positioning position can be set according to the user's preference, so that the operability at the time of microscopy is improved. Thus, fatigue can be reduced. Also,
When the locking positioning member is worn, by changing the fixing position, it is possible to return to the original locking force amount, and it is possible to correct a decrease in the locking pressure due to wear over a long period of time.

In this embodiment, the locking positioning member 15
Is fixed by using the fixing screw 16. However, the structure is not limited to this as long as it can be fixed securely. For example, the male screw portion of the locking positioning member 15 may be lengthened to lock the locking positioning member 15. A structure using a nut may be used.

[0022]

According to the invention according to claim 1 or 2,
Turn the locking positioning member to position the unused objective lens in the loosening direction to release the locking with the elastic member for positioning, and set it so that only the locking positioning member of the objective lens to be used can be locked. Since the microscope is used, deterioration of the positioning accuracy and generation of dust can be prevented, the worn locking positioning member can be easily replaced, and the reliability and durability as a product can be improved.

According to the second aspect of the invention, in addition to the above effects, the locking positioning member is fixed at the position of the locking pressure desired by the user so that the microscope can be used. Improved operability and reduced fatigue can be realized. Further, when the locking positioning member is worn, by changing the fixing position, it is possible to return to the original locking pressure, and a decrease in the locking pressure due to wear can be corrected over a long period of time.

[Brief description of the drawings]

FIG. 1 is a bottom view of an objective lens conversion device according to a first embodiment.

FIG. 2 is a sectional view taken along the line EFG of FIG. 1 of the first embodiment.

FIG. 3 is a top view of the objective lens conversion device according to the first embodiment;

FIG. 4 is a view on arrow Z1 in FIG. 3 of the first embodiment;

FIG. 5 is a top view of the objective lens conversion device according to the second embodiment.

FIG. 6 is a sectional view taken along the line EFG of FIG. 5 according to the second embodiment.

FIG. 7 is a view on arrow Z2 in FIG. 5 of the second embodiment.

FIG. 8 is a longitudinal sectional view of the objective lens conversion device of Conventional Example 1.

FIG. 9 is a view of the conventional example 1 taken along the arrow Z3 in FIG. 8;

FIG. 10 is a view of the conventional example 1 as viewed from the arrow Z4 in FIG. 8;

FIG. 11 is a longitudinal sectional view of an objective lens conversion device of Conventional Example 2.

FIG. 12 is a view of the conventional example 2 viewed from the arrow Z5 in FIG. 11;

FIG. 13 is an enlarged cross-sectional view taken along the line XOX of FIG.

[Explanation of symbols]

 Reference Signs List 1 rotating member 4 fixing member 6 click spring 15 locking positioning member m observation optical axis

Continued on the front page (72) Inventor Keiichi Iizuka 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Industrial Co., Ltd. (72) Inventor Naoto Yoshida 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical F term in Industrial Co., Ltd. (reference) 2H044 HC01 2H052 AD10 AD33 2H087 KA09 LA01

Claims (2)

[Claims] 1. mounting at least two objective lenses,
Objective lens conversion device having a rotating member for moving the objective lens on the observation optical axis, a locking positioning mechanism for positioning the objective lens on the observation optical axis, and a fixing member fixed to the microscope body In the above, the locking positioning mechanism comprises a positioning elastic member screwed to the fixing member, and a locking positioning member screwed to the rotating member and locked at the tip thereof with the positioning elastic member. An objective lens conversion device characterized by comprising. 2. The objective lens conversion device according to claim 1, wherein a locking pressure between said elastic member for positioning and said locking positioning member can be arbitrarily set.