JP3093010B2 - Revolver fixed position stop device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a microscope, for example, and a revolver body supporting a plurality of selected members such as an objective lens is rotated by a brushless motor to select one of the selected members. The present invention relates to a fixed position stopping device for a revolver for stopping at a fixed position.

[0002]

2. Description of the Related Art Conventionally, as a revolver of a microscope, there is a microscope in which a plurality of objective lenses are mounted on a revolver main body and driven by a motor. In this case, there are the following two fixed position stop devices (click positioning devices) for selecting one of the objective lenses and accurately positioning it on the optical path of the optical system. The first example is an electric system using a pulse motor or a DC motor for accurate control of the stop position.

[0003] A second example is a mechanical system in which a stop lever is dropped into a V-groove formed on the outer periphery of the revolver main body to lock the revolver main body at a predetermined position.

The first example is of an electric type, so that accurate positioning is difficult and expensive due to inertia. The second example is
Since the drawback of the first example can be eliminated, it is often used conventionally, but a sensor for detecting a stop position (click position) is required.

As a specific example of the second example, Japanese Patent Publication No. Sho 6
There is a device disclosed in Japanese Patent Publication No. 0-15245, in which a slit indicating a stop position is provided in a part of the revolver main body,
The photo interrupter detects the slit, that is, the stop position.

FIG. 10 shows another example of this embodiment.
The rotating shaft 2 of the motor 23 for rotatingly driving the revolver body 20
3a, a slit plate 24 is provided directly on the revolver main body 20.
However, the slit plate 24 is rotated an integer number of times during one click rotation, and the photo interrupter 25 detects the stop position. Here, 21 is an objective lens, and 22 is a gear.

[0007]

The above-described conventional revolver fixed position stop device uses a photo-interrupter to detect the stop position of the revolver main body.
A special space had to be provided around the revolver itself. Further, a slit (notch) may be provided on the outer periphery of the revolver main body, or the rotating shaft 2 of the motor 23 may be provided.
It was necessary to prepare a slit plate 24 to be directly attached to 3a.

The present invention does not require a photoelectric sensor such as a photo interrupter for detecting a stop position (click position), and does not require any mechanical processing. The purpose is to provide.

[0009]

In order to achieve the above object, the present invention is configured as shown in FIGS. That is, a disc-shaped revolver main body 1 rotatably supported by the fixed portion and supporting the selected members 4 such as a plurality of objective lenses, and at least one of the entire peripheral surface or the plate surface of the outer peripheral edge of the revolver main body 1 A magnet row 3 magnetized so that the polarity of a plurality of magnets alternates with the N pole and the S pole along the entire periphery of the peripheral edge, and the magnet row 3 is fixed with a predetermined gap therebetween. A plurality of exciting poles which are fixed to the portion and are arranged with a gap on a surface facing the magnet row 3 and which form a magnetic pole on which a current force acts between the magnet row 3 and a current by flowing a current. The coils 51 to 53 and the exciting coils 51 to 53
And magnetic detecting elements 61 to 63 for detecting a magnetic field generated from the magnet row 3 to detect a relative position of the revolver main body 1, and detecting signals of at least the magnetic detecting elements 61 to 63. A drive circuit 9 that inputs a rotation direction command signal and sequentially switches the current flowing through the excitation coils 51 to 53, and calculates a rotation direction and a rotation amount of the revolver main body 1 from detection signals of the magnetic detection elements 61 to 63, The control circuit 8 includes a control circuit 8 that outputs a stop signal to the drive circuit 9 at a stop position for a predetermined time, and a click mechanism 7 that stops the revolver main body 1 when the selected member 4 is at a predetermined position.

[0010]

According to the present invention, in order to detect the stop position of the revolver main body 1, the signals of the magnetic detecting elements 61 to 63 used for detecting the magnetic pole switching of the brushless motor are used as in the prior art. No components such as a photoelectric sensor are required, and no special processing is required unlike a slit plate.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a perspective view showing a revolver section of an embodiment of the revolver fixed position stop device of the present invention, and FIG. 4 is a block diagram showing a control section. The revolver has a rotating side and a fixed side. The rotating side is a disk-shaped, has a shaft insertion hole (not shown) at this center position, and has a revolver body 1 on which five objective lenses 4 can be mounted.
A rotating shaft (not shown) which is mounted in a shaft insertion hole and is rotatably supported by a microscope body (not shown);
A magnet row 3 magnetized so that the polarity of a plurality of magnets alternates between an N pole and an S pole around the entire outer peripheral surface of the revolver main body 1
The objective lens 4 is fixed to one of the plate surfaces (here, the lower surface), and is disposed between the revolver main body 1 and the magnet row 3 and is fixed to both to concentrate the magnetic flux generated by the magnet row 3. And a ring 2 made of a magnetic material such as iron.

The fixed side is fixed to a microscope main body (not shown), is disposed with a slight gap in between the magnet row 3, and is an arc-shaped coil supporting member (not shown) made of a magnetic material such as iron. And three trapezoidal exciting coils 51 to 53 bonded to the surface of the coil supporting member facing the magnet row 3 with a space therebetween, and the respective exciting coils 51 to 5
3, each of which is bonded to a magnetic field detecting element 61 to 63 for detecting a magnetic field generated from the magnet row 3 and detecting a relative position of the revolver main body 1.

In the revolver main body 1, five balls 71 are arranged and fixed at positions corresponding to the selected members 4, respectively, and are fixed to a microscope main body (not shown) as shown in FIG. The click mechanism 7 is constituted by a positioning plate 72 made of an elastic material having a hole 72a so that the ball 71 fits in the center position. In this click mechanism 7, since the ball 71 fits into the hole 72a of the positioning plate 72 by the rotation of the revolver main body 1, it can be determined whether any of the objective lenses 4 has entered the optical path of the microscope.

A drive circuit 13 for sequentially switching the current flowing through the exciting coils 51 to 53 is provided. Further, in order to control the fixed position stop of the revolver main body 1, the following is performed. That is, a motor stop command circuit 12 that calculates a rotation direction and a rotation amount of the revolver main body 1 from detection signals of the magnetic detection elements 61 to 63 and outputs a stop signal to the drive circuit 9 at a stop position for a predetermined time; The detection signals detected by the magnetic detection elements 61 to 63 [FIG.
(A) is input and converted into a waveform as shown in FIG. 5 (b), and a waveform conversion circuit 10 which operates in the same manner as an incremental encoder, and converts the converted A-phase and B-phase signals. , A-phase, and B-phase, and an up / down counter 11 that outputs the count value to the motor stop command circuit 12 as position information.

Hereinafter, the operation of the embodiment constructed as described above will be described. Now, when a voltage is applied from the drive circuit 13 to the coils 51 to 53 and the currents are sequentially switched, a current force acts between the magnetic poles formed thereby and the magnets of the magnet row 3 to form a brushless motor. It operates, and the revolver main body 1 rotates.

On the other hand, the detection signals detected by the magnetic detection elements 61 to 63 are as shown in FIG. 5A, which is input to the waveform conversion circuit 10 to have a waveform as shown in FIG. Is converted. The converted A-phase and B-phase signals are
This indicates the amount of rotation of the revolver main body 1.

The signal converted by the waveform conversion circuit 10 is input to an up / down counter 11, where the signals are A-phase and B-phase.
The signal for each phase is counted, and this count value is output to the motor stop command circuit 12 as position information. The motor stop command circuit 12 calculates the motor stop timing based on the number of the selected members 4 that can be mounted on the revolver main body 1 obtained from the revolver type signal and the position information from the up / down counter 11, and outputs the motor stop signal. Drive circuit 13
Output to In the drive circuit 13, when the revolver main body 1 is stopped by clicking at the time of electric switching, the excitation coils 51 to 51
53 is short-circuited for a certain period of time and stopped, and then the motor is made free (open). By making the motor free, the ball 71 can be fitted (dropped) into the hole 72a of the positioning plate 72.

Here, the relationship between the A-phase and the B-phase and the actual stop timing will be described with reference to FIG. FIG.
(A) shows a state in which the ball 71 is completely dropped into the hole 72a of the positioning plate 72. Now
The stop timing when the ball 71 has moved by the movement of the revolver main body 1 from the direction (A) is the point A before the ball 71 is completely dropped into the hole 72a of the positioning plate 72, Conversely, when the ball 71 has moved due to the movement of the revolver main body 1 from the direction (b), it is point B. The interval between the points A and B is determined by the minimum resolution of the A phase and the B phase as shown in FIG.

Further, a hole 72a of the positioning plate 72 is positioned from the point A.
Is the same as the distance from the point B to the center of the hole 72a, which is the click position (the state where the ball 71 is completely dropped into the hole 72a of the positioning plate 72). ), The magnetic detection elements 61 to 63
And between 1 / 3w and 3 / 6w, 5 / 6w (w is the width of the magnet) as shown in FIG. You. Although FIG. 9 focuses on the magnetic detection element 61 (U),
The same applies to (V) and the magnetic detection element 63 (W).

When this state is expressed by an equation, at the click position, the distance between the magnetic detection elements 61 to 63 and the Sakai of the N-pole and S-pole magnets is w (2n + 1) / 6 (n = 0,
1, 2,...).

However, all the magnetic detecting elements 61 to 63
However, in order to satisfy this condition, (log number of magnets) = (number of selected members) × 1 so that the number of magnets when the N pole and the S pole are paired is two or more and an integer. / 6n (n
Is an integer of 1 or more).

The interval of 1 / 6w corresponds to the interval from A (or B) until the click completely falls in FIG.

According to the first embodiment described above, the signals of the magnetic detecting elements 61 to 63 for detecting the pole switching of the brushless motor are electrically processed without using a photoelectric sensor such as a photo interrupter. Thus, a small and inexpensive fixed position stop device can be obtained without adding any extra parts in the revolver main body 1 and without requiring any mechanical processing.

In the first embodiment described above, the exciting coil 5
FIG. 7A shows a case where three magnetic detection elements 61 to 63 are used with respect to 1 to 53.

As shown in FIG. 7B, the three magnetic detecting elements 61A and 62A are further placed at positions shifted in phase.
A and 63A may be added. In this case, the other configuration is the same as that of the above-described embodiment, and the respective magnetic detection elements 61 to 63,
The output signals of 61A to 63A and the A-phase and B-phase signals obtained from the waveform conversion circuit 10 of FIG. 4 are as shown in FIG. As is apparent from this figure, the magnetic sensing elements 61A to 63A
Is added, A-phase and B-phase signals with double resolution can be obtained. This means that the distance between A and B is halved in FIG. That is, the distance between A and B can be changed by changing the width of the magnet, but the number of magnetic detection elements can be further changed.

In each of the embodiments described above, the position information obtained from the magnetic detecting elements 61, 62, 63 indicates a relative position, but when the power is turned on, the revolver main body 1 is set to a click position. If there is no problem, or if one switch is provided and the power is not turned on at the click position when the power is turned on, the revolver main body 1 is manually set at the click position, and the switch is pressed there to recognize the click position. Is also possible. In addition, when separately providing the type sensor of the hole of each revolver, it is not necessary to consider the reference position as described above, and it is possible to detect the absolute position of the click position in combination with the type of the hole of the revolver and the sensor. Become. The magnetic detecting element may be a Hall IC, and the motor may be a multi-phase other than the three-phase. Further, as for the click mechanism, another method such as a method in which a V-groove is formed on the outer periphery of the revolver main body and a lever is dropped into the V-groove may be used. The number of objective lenses to be mounted on the revolver main body is not limited to five, but may be any number. In addition to the objective lens, any selected member such as an optical filter and a mirror may be used.

[0027]

According to the present invention, there is no need for a photoelectric sensor such as a photo interrupter for detecting a stop position (click position), and no mechanical processing is required. A position stop device can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a fixed position stopping device for a revolver according to the present invention.

FIG. 2 is a block diagram showing a control circuit of the fixed-position stopping device for the revolver shown in FIG. 1;

FIG. 3 is a perspective view showing a configuration of a first embodiment of a revolver localization stopping device according to the present invention.

FIG. 4 is a block diagram showing a control circuit of the localization stop device of the revolver shown in FIG. 3;

FIGS. 5A and 5B are timing charts for explaining the operation of FIGS. 3 and 4;

FIG. 6 is a view for explaining the operation of the click mechanism shown in FIG. 3;

FIGS. 7A and 7B are diagrams showing an arrangement configuration and a modified example of the magnetic detection elements of FIGS. 3 and 4, respectively.

FIG. 8 is a timing chart for explaining the operation in the case of FIG. 7 (b).

FIG. 9 is a view for explaining the operation of FIGS. 3 and 4;

FIG. 10 is a perspective view showing a configuration of a conventional revolver localization stopping device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Revolver main body, 2 ... Ring, 3 ... Magnet row, 4 ... Selected members, such as an objective lens, 51-53 ... Excitation coil, 61
63 to magnetic detection element, 8 to control circuit, 9 to drive circuit.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-9550 (JP, A) JP-A-52-101054 (JP, A) JP-A-62-218915 (JP, A) JP-A Sho 50- 80125 (JP, A) JP-A-54-69431 (JP, A) JP-A-56-93713 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02B 7/16 G02B 21 / 00 G02B 21/06-21/36

Claims (1)

(57) [Claims] 1. A disc-shaped revolver main body rotatably supported by a fixed portion and supporting a plurality of selected members such as objective lenses, and at least one of an entire peripheral surface or a plate surface of an outer peripheral edge of the revolver main body. The polarity of multiple magnets along the entire periphery
A magnet row magnetized so as to be alternately arranged with N poles and S poles, and a fixed gap interposed between the magnet row and the fixed portion, and a gap is provided on a surface facing the magnet row. A plurality of exciting coils that form a magnetic pole on which a current force acts between the magnet array and the magnet array by passing an electric current. A magnetic detection element for detecting a generated magnetic field to detect a relative position of the revolver main body, and a drive circuit for inputting at least a detection signal of the magnetic detection element and a rotation direction command signal, and sequentially switching a current flowing through the excitation coil. A control circuit that calculates a rotation direction and a rotation amount of the revolver main body from a detection signal of the magnetic detection element, and outputs a stop signal to the drive circuit at a stop position for a predetermined time; Fixed-position stop device of the revolver equipped with a click mechanism for stopping the revolver body when located.