JPS6281962A - Method and apparatus for controlling actuator - Google Patents

Abstract

PURPOSE:To simplify structure while removing revolution by a wave motion at small intervals, and to smooth revolution of a rotor section by housing a braking material to a stator section while being brought into contact with the rotor section. CONSTITUTION:A rotor section is constituted of a shaft 22 and a permanent magnet 23. A stator section into which the rotor section is incorporated is composed of vertically divided spools 25, 26, a drive coil wound after unifying these spools 25, 26 and a housing 28 into which the spools 25, 26 are built. A braking material 36 giving braking force while being brought into contact with the rotor section is sealed into the stator section in order to smooth the revolution of the rotor section.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an actuator used as a drive source for an automatic aperture mechanism used in various cameras such as photographic cameras, television cameras, and video cameras. Braking method and [? It is related to.

[Prior Art] In general, the actuator of this scale uses a 1-navigation mechanism and has an effective angle of view of 180 mm, as shown in FIGS. 10 and 11.
The DC actuator below ° is used or worn out. The structure of this actuator is composed of a rotor section A consisting of a shaft 1 and permanent magnets 2, and a stator section B. This stator section B is composed of a drive coil 4 wound around a winding frame 3, a feedback coil 6 wound around a winding frame 5, a case 7 for forming a magnetic path, and a printed circuit board 8 for connecting the coils. .

The configuration of the control circuit that controls the drive coil 4 and the feedback coil 6 is as shown in FIG.
．． A push-pull circuit 11 is provided. This push-pull circuit 11 has an increase of Ill S 9 [1]
The rate is the resistor 1 installed on the signal input terminal 12 side, and
11] 3
The output voltage of amplifier 9 is applied to the inverting input side of amplifier 2 via a phase inverting circuit of resistors R3 and R4. The feedback coil 6 is connected to the positive electrode side of the width increaser 59.10.

Note that R and R are bias resistors, and R7 is a resistor that adjusts the amount of negative feedback.

In an actuator having such a so-called four-node mechanism, a signal corresponding to the external light i1 is input as a voltage from the signal input terminal 12, and a current flows through the drive coil 4. When current flows through the drive coil 4, the rotor portion Δ starts rotating, and the rotation of the rotor portion changes the number of magnetic fluxes passing through the feedback coil 6, and an electromotive force is generated in the feedback coil. Since this electromotive force is applied to the push-pull circuit 11 as a gi multiplication signal, the current flowing through the drive coil is suppressed, and the rotor portion A tries to stop rotating.

When the rotation of the rotor section A is about to stop, the electromotive force of the feedback coil 6 decreases, and when the rotor section A rotates again, an electromotive force is generated in the feedback coil again. By repeating the above operation, the rotor section A is intermittently In other words, it rotates 1J in a predetermined direction at a constant speed. That is, as shown in FIG. 13, when a predetermined voltage signal V is applied to the signal input terminal 12, the rotor section
The problem is that the motor rotates 11 times in a small wave state and is not driven smoothly.

[Problems to be Solved by the Invention] The present invention solves the problem that the rotor section is driven in an intermittent and sharp wave state due to the drive coil and the feedback coil as in the conventional example, and the problem as described above. This is an attempt to solve the problem of a control circuit that is used for driving and requires a large number of components.

[Means for Solving the Problems] The present invention provides specific means for solving the problems described above, in which an actuator is rotatably incorporated into a rotor portion and a stator portion, and in which only a drive coil is provided in the stator portion. (4) provides a method for braking an actuator, characterized in that a braking material that contacts the rotor to apply braking force is sealed in the stator to smooth the rotation of the rotor. The rotation of the rotor part is braked by the adhesiveness of the braking material or the rP friction resistance, and the specific device includes (a) a rotor part consisting of a shaft and a permanent magnet, and (b) ) a winding frame for a braking material container in which the rotor part is rotatably incorporated and in contact with the rotor part;
a stator portion comprising a drive coil wound around the winding frame, a housing in which the winding frame is housed, and (c) a drive circuit comprising an amplifier for amplifying a predetermined signal to the drive coil. This actuator device does not require a feedback coil, so the structure is in a cylinder, and even during rotational operation, due to the braking force of the damping material, there is no rotation due to small waves, and it rotates smoothly. be.

[Embodiments] Next, to explain the present invention in more detail with reference to several illustrated embodiments, in the actuator of the first embodiment shown in Figs. The section is composed of a shaft 22 and a permanent magnet 23. The stator section 24 into which the [1-tactor section is incorporated] is composed of a winding frame 25° 26 divided in the vertical direction, a drive coil 27 wound after combining these winding frames, and a housing 28 into which the winding frame is assembled. has been done.

Since the rotor portion 21 is incorporated inside the winding frames 25 and 26, the permanent magnet 23 is 7rtlO! rotor chamber 2
9 are provided, and bearings 30 and 31 are provided in the center of each
is installed, and the bearing 31 of the upper winding frame 26 is connected to the rotor section 2.
It is configured so that one shaft 22 passes through four. Furthermore, the winding frame 25.2G has guide recesses 32.33 formed from the top surface to both side surfaces and the bottom surface so that the drive coil 27 can be wound in an orderly manner after the winding frame 25.2G is combined. In order to do this, a plurality of guide holes 34 are formed in the combined surface of the lower winding frame 25, and a plurality of pins 35 are respectively provided in the combined surface of the -L portion of the winding frame 26 corresponding to these guide holes. (It is pu.

When combining both winding frames 25 and 26, the rotor part 21 is housed in the internal rotor chamber 29, and the pin 35 and guide hole 3 are
4, the rotor chamber 29 is assembled with high precision, the adhesive is used to maintain airtightness, and the rotor chamber 29 is filled with the damping material 36. The braking material in this case is, for example, a liquid such as silicone oil or other oil, or a fluid such as a lubricating powder. These damping materials are appropriately selected in consideration of lubricity, temperature dependence, weather resistance, etc. After combining both frames 25.2G, as described above, the drive coil 27 is wound [], and both ends of the drive coil 27 are connected to the terminals 37.
．． 38 and taken out, and the terminals 37 and 38 are installed in the upper frame 2G. Incidentally, these terminals may be prevented from being removed by using the lower frame 25 or another pudding l-11 board.

The frame bodies 25 and 26 formed in the shape of J: are stably inserted and fixed into the housing 28, and the housing 28
A plurality of tongue pieces 39 and 40 are provided for attachment to the equipment.

As shown in FIG. 5, there is a circuit for driving the active circuit of the above configuration. Winding frame 2 incorporating rotor part 21!
The drive coil 27 wound around 26 is driven by an amplifier 41 via terminals 37 and 38, and a signal input terminal 42 is connected to the amplifier 11 to which a predetermined signal is input based on the amount of external light. has been done.

In the second embodiment shown in FIG. 6 and the third embodiment shown in FIG.
1 has been subjected to predetermined processing to maintain or improve the braking force, and since other parts are the same as those of the first embodiment, the same reference numerals will be given and explanations thereof will be omitted. That is, the 6th
In the second embodiment shown in the figure, a plurality of protrusions 43 are integrally provided on the circumferential surface of the permanent magnet 23 to serve as a kind of resistor and increase the contact area with the braking material 36. For example, when a fluid with low viscosity is used as the braking material 36, a predetermined braking force is applied. In the third embodiment shown in FIG. 7, the speed is changed depending on the direction of rotation of the []-taper section 21. A number of blade members 44 inclined in the -I direction are integrally attached to the circumferential surface of the permanent magnet 23 of the rotor portion 21, and serve as a resistor against the braking material 3G. .

By avoiding the tilt of the blade member 44, the rotation in the tilted direction will be shorter and the rotation in the opposite direction will be faster. For example, when used in a diaphragm mechanism, it is made to rotate quickly in the diaphragm direction and slowly in the opening direction. In any of the embodiments, it goes without saying that the projections 43 and the blade members 44 are mounted at symmetrical positions so that the rotor portion 21 can rotate evenly.

The fourth embodiment shown in FIG. 8 is a six-man model in which a brake material chamber 45 for storing a brake material 36 is separately provided, and the other configurations are the same as those of the first embodiment. Therefore, the same reference numerals are given and the explanation thereof is omitted.In this fourth embodiment,
The shaft 22 protruding from the lower part of the rotor part 21 is formed a little longer, and the lower wheel bearing 30 is passed through ξ゛1 so that it protrudes from the lower part,
A brake material chamber 45 is attached to J surrounding the protruding portion, and the brake material chamber 45 is filled with a brake a+J36 similar to that of each of the above embodiments. In this embodiment as well, a resistor 4G such as a protrusion or a blade member similar to the second and third embodiments is used.
The site that is in contact with Le II EJ + Shrine 36! Futo 22
It is possible to improve the braking force and change the braking speed by integrally incorporating this part.

[Function] In the actuator of the present invention having the above configuration,
External light G is detected and a predetermined signal is input from the signal input terminal 42, and is amplified by the amplifier 41 and sent to the drive coil 2.
7 is energized. When this electricity is applied, the rotor part 21 rotates. For example, if silicone oil is used as the braking material 36, the permanent magnet 23 or the shaft 2
Since a braking force is applied due to the adhesiveness of the silicone oil to 2, it does not rotate suddenly but rotates smoothly at a predetermined speed. This rotational speed is determined by the level of adhesion of the braking IJ 36, the protrusion 43 provided on the rotor part, or the blade member 44.
It depends on the degree of resistance and in the case of powder I9! Determined by the ta force. As described above, since the rotation of the rotor part 21 is braked by the adhesiveness of the braking material 36, the degree of resistance, and the frictional force, the rotor part 21 does not rotate in a sharp wave state, but rotates in a smooth manner.

For example, as shown in Figure 9, a constant voltage V! When the voltage rises, it rotates with a smooth rising curve M, and becomes horizontal at a position corresponding to the voltage level.

In other words, when applied to an aperture fl structure, the input signal is determined based on the amount of external light, and the aperture frame is determined accordingly. That position is the horizontal position on the graph. Moreover, when the voltage in the input signal disappears, it falls along a gentle curve M', contrary to the above. In either case, smooth rotation is achieved.

[Effects of the Invention] As explained above, in the actuator control method according to the present invention, the coil for driving the rotor section is only the drive coil provided in the stator section, and the stator section is brought into contact with the rotor section. By storing the braking material, the braking H
Braking force is applied to the rotation of one rotor by the sticky bamboo or frictional resistance, and unlike conventional examples, a feedback coil is not required, so the rotor rotates smoothly without wave motion. It has this excellent effect.

In addition, by changing the type of braking material used and installing a resistor on the rotor (by changing the degree of contact with the braking material, the rotational speed of the rotor can be set to any desired speed). .

Furthermore, since the actuator device of the present invention only includes a drive coil in the stator section, there is no need to configure a feedback coil and a drive circuit for the feedback coil, and the number of parts is reduced. Not only is it more reliable than other products, it also has the advantage of being smaller and can be provided at a lower price.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a seven-cut unit device according to a first embodiment of the present invention, FIG. 2 is a plan view of the same device, and FIG. 3 is a cross section taken along line nm in FIG. 2. Figure, Figure 4 is Figure 3! 5 is a schematic circuit diagram for driving the same device, and FIG. 6 is a sectional view along V-[V $2, FIG.
7 is a sectional view similar to FIG. 4 according to the third embodiment, FIG. 8 is a sectional view similar to FIG. 3 according to the fourth embodiment, and FIG. 9 is a sectional view similar to FIG. Figure 10 is a graph showing the operation status of the actuator section of the inventive device (Fig. 11 is a plan view of the conventional actuator device)
12 is a circuit diagram for driving the device, and FIG. 13 is a graph showing the operating status of the device. 21... Rotor part 22... Shaft 23... Permanent magnet 24... Stator part 25, 26... Winding frame 27... Drive coil 28... Housing 29... Rotor chamber 30. 31...Bearing 32, 33...Four guide parts 34...Guide hole 3
5... Pin 3G... Braking material 37, 3
8... Terminal 39.40... Tongue piece 41.
...Amplifier 42...Signal input terminal 43.
...Protrusion 44...Blade member 45...
Control! IJ Moon Room 46...Low Stone Patent Applicant Fuji Il Electric Manufacturing Co., Ltd. Figure 2 Figure 3 30 ll:s Figure 4 Figure 8 Figure 4ri Figure 9 O Time - Figure 13

Claims (6)

[Claims] (1) In an actuator that is rotatably assembled into a rotor and a stator, only a drive coil is wound around the stator, and the braking force is applied by contacting the rotor in order to smooth the rotation of the rotor. A method for braking an actuator, characterized in that a braking material is enclosed in a stator portion. (2) The braking method according to item 1 above, wherein a resistor is provided in the rotor portion to increase the degree of contact with the braking material and improve the braking force. (3) The braking method according to item 1 above, wherein a fluid made of liquid or powder is used as the braking material. (4) (a) A rotor section consisting of a shaft and a permanent magnet; (b) a winding frame into which the rotor section is rotatably incorporated and which serves as a container for braking material that contacts the rotor section; An actuator device comprising: a stator portion including a housing in which a drive coil and a winding frame are housed; and (c) a drive circuit including an amplifier for amplifying and applying a predetermined signal to the drive coil. (5) The actuator device according to item (4) above, characterized in that the winding frame is vertically divided, a rotor chamber is provided inside, and a bearing is provided in the center. (6) The lower shaft of the rotor portion is formed to be longer and protrudes through the lower bearing, and a separate brake material chamber is attached so that the protruding portion contacts the brake material.
4) The actuator device described in section 4).