JP2002090644A - Motor-drive position switching mechanism for microscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive motor-drive position switching mechanism for a microscope for which necessary stoppage accuracy is secured and whose control method is easy. SOLUTION: This motor-drive position switching mechanism for the microscope is equipped with an electric motor 2, having a fixing means for fixing the rotary shaft of the mechanism, motive power intermittent transmitting means 1, 4, 10 and 11 which absorb rotational output, until the motor 2 is stopped after a movable part 7 for switching the position of an optical member 9, is stopped and pressing means 1, 4, 10 and 11 for holding the movable part 7 at stopping positions 12a and 12b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorized position switching mechanism for a microscope used for switching the position of an optical member such as a lens change.

[0002]

2. Description of the Related Art When a microscope is to be motorized, there are various motorized position switching mechanisms such as lens switching, optical path switching, insertion and removal of filters and lenses, and the like. In a motorized position switching mechanism of a microscope, the position of an optical member such as a lens is often required to be high precision. A DC motor or a stepping motor is often used as an electric prime mover of these electric position switching mechanisms, but the DC motor is inexpensive as compared with the stepping motor, and thus is most often used for the electric position switching mechanism. However, due to the operating principle of the DC motor, there is a large variation in the motor rotation output with respect to the power input. Therefore, in order to switch the stop position with high precision, control such as acceleration, deceleration, and stop of the motor rotation output becomes complicated. Also, assembly adjustment was difficult. Several proposals have been made to easily realize such a highly accurate electric position switching mechanism.

First, an “optical path switching device” is disclosed in
A technique (conventional example 1) disclosed in Japanese Patent Application Publication No. 00-66121 is disclosed. As shown in FIG. 4, a rotating member 110 having a mirror 111 that can be inserted into and removed from the optical axis 113 is rotated by a cam 118 driven by a motor 117 via a bearing 116, and the rotating member 110 is rotated by a tension spring. The position of the rotating member 110 positioned by the stopper and the position of the cam 118
The optical path is switched by the mirror 111 in correspondence with the predetermined position of the rotating member 110 moved by the rotation of. The amount of rotation of the motor 117 is detected by the photo interrupter 120, and the motor rotation output is separately controlled by a control circuit.

[0004] As an "electric revolver device", a technique (conventional example 2) disclosed in Japanese Patent Application Laid-Open No. Hei 7-31343 is disclosed. As shown in FIGS. 5 and 6, the motorized revolver device includes a revolver 2 having an objective lens (not shown).
20, a motor for rotating and braking the revolver 220, for example, a DC motor 221, a positioning unit 205 for stopping the revolver 220 at a predetermined position, for example, an arm plate 232, and the rotation amount of the revolver 220 reaches a predetermined amount. A fixed rotation detection unit 206 for detecting that the operation has been performed, for example, a photo interrupter 235 and a light shielding plate 225 is provided. The revolver 220 is provided with a motor 221 at a central portion, and the motor 221 is held in a state in which a rotation shaft 228 of the motor 221 is rotatably passed through a holding cylinder 227. The holding cylinder 227 is fixed to a fixing member 226, and the fixing member 226 is detachably connected to the mounting member 224. The mounting member 224 is fixed to the support base 222,
The lens barrel 223 is provided on the support base 222. The amount of rotation of the motor 221 is detected by the photo interpreter 235, and the motor rotation output is controlled by a separate control circuit.

[0005]

However, the prior arts 1 and 2 both use a sensor such as a photo-interrupter and a separate control circuit to control the motor rotation output, so that the cost increases. The control was also complicated.

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 claims 1, 2 and 3 is to secure a required stop accuracy, to use a simple control method, and to reduce the cost. An object of the present invention is to provide a motorized position switching mechanism for a microscope.

[0007]

According to a first aspect of the present invention, there is provided a motor-driven position switching mechanism for a microscope, comprising an electric motor having a fixing means for fixing a rotating shaft thereof. Power intermittent transmission means for absorbing a rotational output until the electric motor stops after the movable part that switches the position of the optical member is stopped, and pressing means for holding the movable part at the stop position. .

In the electric position switching mechanism of the microscope according to the first, second or third aspect of the present invention, the movable portion is rotated to the stop position by the rotation output of the electric motor and stopped, and the electric motor is stopped by the power intermittent transmission means. After the rotation of the electric motor is stopped, the movable portion is held at the stop position by the pressing means after the electric motor is stopped, and the holding force is held by the rotating shaft of the electric motor fixed by the fixing means.

In the electric position switching mechanism for a microscope according to the second or third aspect of the present invention, in addition to the above-mentioned operation, the power intermittent transmission means is constituted by a slip mechanism provided on a rotating shaft of the electric motor, so that the electric motor can be used. The rotation output until the stop is absorbed by the slip mechanism.

[0010] In the electric position switching mechanism for the microscope according to the third aspect of the present invention, in addition to the above operation, the pressing means includes an elastic belt, so that after the electric motor is stopped,
The movable part is held at the stop position by the elastic force generated by the elongation of the belt.

[0011]

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

(Embodiment 1) FIGS. 1 and 2 show Embodiment 1. FIG. 1 is a perspective view of an electric position switching mechanism.
Is a perspective view of the arm. In FIG. 1, a pulley 1 is fixed to a rotating shaft of a motor 2 as an electric motor.
As the motor 2, for example, a DC motor with a gear head having a reduction ratio of 120: 1 is used, and the friction of the gear head obtains a fixing force of the rotating shaft which is not inferior to a pressing force for applying a pedestal 7 to the stoppers 12 a and 12 b described later. ing. That is, in this case, the gear head constitutes fixing means for fixing the rotating shaft of the electric motor. A shaft 5 is supported by a bearing (not shown) in parallel with the rotation shaft of the motor 2, and a pulley 4 is fixed to one end of the shaft 5.
A friction belt 10 serving as an elastic belt is stretched between the pulley 1 and the pulley 4 via an idler 11. The pulley 1, the pulley 4, the friction belt 10, and the idler 11 constitute a power intermittent electric unit and a pressing unit. The other end of the shaft 5 has an arm 3 shown in FIG.
The base hole 3a of the arm 3 is fixed, and the distal hole 3b of the arm 3 is connected to the link 6.

A fixed shaft 8 is provided at a position parallel to the axial direction of the shaft 5, and a pedestal 7 as a movable portion is rotatably fitted on the fixed shaft 8. One end of the pedestal 7 is connected to the link 6, and is rotatable by receiving the movement of the shaft 5.
A pair of stoppers 12a and 12b are provided below the pedestal 7, and constitute a stop position of the pedestal 7 for rotational movement. A lens 9 as an optical member is provided in a direction substantially perpendicular to the axial direction of the fixed shaft 8. The pedestal 7 and the lens 9 are integrated by a support 13, and the lens 9 is configured to rotate with the pedestal 7 and switch its position.

Next, the operation of the electric position switching mechanism having the above configuration will be described. The rotation output of the motor 2 is transmitted to the shaft 5 via the pulley 1, the friction belt 10, the pulley 11 and the pulley 4, and from the shaft 5 via the arm 3 and the link 6, about the fixed shaft 8 as the center of rotation. Transmitted to the pedestal 7,
The pedestal 7 and the lens 9 perform a rotating motion. When the motor 2 outputs rotation in the direction of arrow X in FIG.
It turns until it hits 2a. Pedestal 7 is stopper 12a
Is slipped between the pulley 1, the pulley 4, the friction belt 10, and the idler 11, and is absorbed. The motor 2 is driven and stopped for a certain period of time, and its rotating shaft is fixed by friction of the gear head of the motor 2. At this time, the friction belt 1 is generated by friction between the pulley 1, the pulley 4, the friction belt 10, and the idler 11.
The elastic force generated by the elongation of 0 acts on the shaft 5, and presses and holds the pedestal 7 and the lens 9 on the stopper 12a as the stop position. When the motor 2 rotates and outputs in the direction of arrow Y, the pedestal 7 and the lens 9 are pressed and held by the stopper 12b as a stop position by the same operation.

According to the present embodiment, the pedestal and the lens are rotated to the stopper by the rotation output of the motor and stopped, and the rotation output of the motor is then reduced by the pulley 1, the pulley 4, the friction belt 10 and the idler 11. After stopping the motor, the pedestal and lens are pressed and held by the stopper by the elastic force generated by the elongation of the friction belt, so the required stopping accuracy is secured, the control method is simple and inexpensive. It is possible to provide a simple motorized position switching mechanism of the microscope. Further, the motor drive can be controlled by a simple control such as stopping after driving for a certain period of time, thereby eliminating the need for a sensor or the like for detecting the motor rotation amount.

In the present embodiment, the pulley 1, the pulley 4,
Although the friction belt 10 and the idler 11 are used, slipping may be performed using a wire rope instead of the friction belt, and the stop positions of the pedestal and the lens may be determined by a click mechanism instead of the stopper. .

(Embodiment 2) FIG. 3 shows Embodiment 2 and is a longitudinal sectional view of a slip mechanism provided on a rotating shaft of a motor. This embodiment is different from the first embodiment only in the slip mechanism provided on the rotating shaft of the motor, and the other parts are the same. Therefore, only the different parts will be described, and the drawings and description of the same parts will be omitted.

3, a rotary shaft 51 of the motor 2 (see FIG. 1) has a flange 51a formed at the tip thereof, and a pulley 52 is fitted around the flange 51a.
The outer diameter of the pulley 52 is the same as the outer diameter of the pulley 1 of Embodiment 1 (see FIG. 1), and the arc-shaped groove 52a with which the friction belt 10 is engaged is recessed. It is the same as the pulley 1 of the first embodiment. On the flange 51a side of the rotating shaft 51, two washers 53 and 4
A plurality of disc springs 54 are fitted. The washer 53 and the disc spring 54 are pressed by a cover 55 screwed to the pulley 52, and the rotating shaft 51 and the pulley 52 come into close contact with each other in the axial direction by the elastic force of the disc spring 54, and can rotate. And it is held while a frictional force acts. The rotation mechanism 51, the pulley 52, the washer 54, the disc spring 54, and the cover 55 constitute a slip mechanism. Motor 2
Since the frictional force of the slip mechanism is acting at the start of the rotation driving of the pulley 52, the pulley 52 is connected to the pulley 1 of the first embodiment.
Performs the same operation as. Other configurations are the same as those of the first embodiment.

The operation of the electric position switching mechanism having the above configuration will be described with reference to FIGS. The rotation output of the motor 2 is transmitted to the shaft 5 via the pulley 52, the friction belt 10, the pulley 11 and the pulley 4, and from the shaft 5 via the arm 3 and the link 6, about the fixed shaft 8 as the center of rotation. The power is transmitted to the pedestal 7, and the pedestal 7 and the lens 9 rotate. When the motor 2 outputs a rotation in the direction of the arrow X in FIG. 1, the pedestal 7 rotates until it comes into contact with the stopper 12a. Pedestal 7
The rotation output after the abutment against the stopper 12a slips between the pulley 52 and the rotating shaft 51 constituting the slip mechanism and is absorbed. The motor 2 is driven and stopped for a certain period of time, and its rotation axis is fixed by friction of the gear head of the motor 2. At this time, as in the first embodiment, the pulley 1, the pulley 4, the friction belt 10, and the idler 11 The elastic force generated by the elongation of the friction belt 10 due to friction acts on the shaft 5, and the pedestal 7 and the lens 9
To a stopper 12a as a stop position. When the motor 2 rotates and outputs in the direction of arrow Y, the pedestal 7 and the lens 9 are pressed and held by the stopper 12b as a stop position by the same operation.

According to the present embodiment, in addition to the same effects as those of the first embodiment, the rotational output until the motor is stopped by the slip mechanism is absorbed. Is eliminated, and the durability of the electric position switching mechanism can be maintained long. In addition, the part where such a slip mechanism is provided is located on the way of transmitting the rotational force of the motor 2 to the pedestal 7 as a movable part.
It does not have to be the rotating shaft of the motor 2. For example, a slip mechanism may be provided between the shaft 5 and the pulley 4 in FIG.

In this embodiment, as means for pressing and holding the pedestal and the lens at the stop position, pulley 1, pulley 4,
The friction belt 10 and the idler 11 are used. However, since slippage occurs between the pulley 52 and the rotating shaft 51, a timing belt is used instead of the friction belt, and the pedestal and the stop position of the lens are replaced with stoppers. Then, it may be configured to be determined by a click mechanism.
In the present embodiment, the slip mechanism is provided on the pulley 52 on the motor 2 side, but may be provided on the pulley 4 side on the shaft 5 side.

[0022]

According to the first, second or third aspect of the present invention, the movable unit is rotated to the stop position by the rotation output of the electric motor and stopped, and the power intermittent transmission means stops the electric motor until it stops. After the rotation of the electric motor is absorbed, the movable part is held at the stop position by the pressing means after the electric motor is stopped, and the holding force is held by the rotating shaft of the electric motor fixed by the fixing means. It is possible to provide an inexpensive motorized position switching mechanism for a microscope that ensures stop accuracy and has a simple control method.

According to the second or third aspect of the present invention, in addition to the above-described effects, the rotation output until the electric motor stops is absorbed by the slip mechanism, so that the durability of the electric position switching mechanism is improved. Can be kept long.

According to the third aspect of the invention, in addition to the above effects, after the electric motor is stopped, the movable portion is held at the stop position by the elastic force generated by the elongation of the belt. Can be omitted, and the electric position switching mechanism can be simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view of an electric position switching mechanism according to a first embodiment.

FIG. 2 is a perspective view of an arm according to the first embodiment.

FIG. 3 is a longitudinal sectional view of a slip mechanism provided on a rotation shaft of a motor according to a second embodiment.

FIG. 4 is a configuration diagram of an optical path switching device of Conventional Example 1.

FIG. 5 is a vertical cross-sectional view of an electric revolver device of Conventional Example 2.

FIG. 6 is a top view of an electric revolving lever device of Conventional Example 2.

[Explanation of symbols]

 Reference Signs List 1 pulley 2 motor 4 pulley 7 pedestal 9 lens 10 friction belt 11 idler 12a stopper 12b stopper

Claims (3)

[Claims] An electric motor having a fixing means for fixing the rotating shaft; and a power intermittent transmission means for absorbing a rotational output from a stop of a movable portion for switching a position of an optical member until the electric motor stops. And a pressing means for holding the movable portion at a stop position. 2. The electric position switching mechanism according to claim 1, wherein said power intermittent transmission means comprises a slip mechanism provided on a path for transmitting a rotational force of said electric motor to said movable part. 3. The electric position switching mechanism according to claim 1, wherein said pressing means comprises a belt having elasticity.