JP3348171B2 - Device for motor rotation control - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor rotation control device used for controlling the rotation of a drive motor, and more particularly to a rotation control of a drive motor such as a sledge motor used for driving an optical pickup for an optical disk or the like. The present invention relates to a motor rotation control device used.

[0002]

2. Description of the Related Art As is well known, an optical pickup that scans an optical disk must move the optical disk between a reproduction position and a return position, or change the moving speed.
Therefore, in order to drive the optical pickup in this manner, its drive motor also needs to control its rotation direction and speed.

[0003] Such rotation control of the drive motor includes N and S in the circumferential direction along the peripheral end face on the rotation axis of the drive motor.
And a rotating plate as a magnetic encoder in which the magnetic poles are alternately arranged, and two motor rotation control elements are provided at a predetermined distance from an end face of the rotating plate and along the circumferential direction of the rotating plate. Are located. Each of the motor rotation control elements is composed of, for example, a semiconductor chip having a Hall element function, that is, a hole chip, and each of the hole chips is separately housed in a package. One motor rotation control element functions as channel A, and the other motor rotation control element functions as channel B. The electromotive forces chA and chB generated in the respective hole chips of the respective motor rotation control elements which are magnetically sensitive to the passage of the N and S magnetic poles when the rotating plate rotates together with the rotation of the drive motor, and the electromotive forces chA and chB. Power chA, c
There is one that detects the rotation speed and rotation direction of the drive motor from the phase between hB, and controls the rotation direction and rotation speed of the drive motor from this detection output.

[0004]

In such a device for controlling the rotation of a motor according to the prior art, (1) the distance between the elements for controlling the rotation of the motor is limited by the size of the package accommodating the device. However, there is a problem that the space for mounting the motor rotation control element in the electronic device mounted on the optical disk becomes large.

(2) Since the distance between the motor rotation control elements is restricted as described above, it is necessary to increase the distance from the center of the rotary plate, which is a magnetic encoder, to the element. As the element becomes longer, it is necessary to use a high-sensitivity element as a result, and as a result, the motor rotation control element becomes expensive, which is disadvantageous in cost as an electronic device equipped with this element. There is a problem that.

(3) Since the motor rotation control elements are individually housed in packages, it is difficult to increase the mounting accuracy of each package. Therefore, if the mounting accuracy of the package is not sufficient, the electromotive force generated in the element will vary, and as a result, a detection output for controlling the rotation of the drive motor cannot be obtained accurately, There is a problem that the drive motor may malfunction.

[0007]

In the present invention according to claim 1 Means for Solving the Problems], two motor control devices in the same package are disposed at a predetermined distance from each other, the two modes
Data rotation control elements are mounted on a common lead frame.
And a common lead frame with each sensor element
Is wire-bonded to this common lead frame.
Is the common terminal of the two sensor elements
In addition, package this package so that the common terminals are diagonal
The above-mentioned problem is solved by having extended from .

[0008] In the present invention according to claim 2, furthermore,
The motor rotation control element is constituted by a magnetically sensitive element.
Cage, lead terminals of one side surface side of the package before
The lead terminal side of the other side through the back of the package
Bent towards the leads on each side
The terminal side is the mounting surface, and the motor rotation
The magneto-sensitive surface of each control element is orthogonal to this mounting surface
This solves the above-mentioned problem.

In the present invention according to claim 3, the same
Two motor rotation control elements are located in the package
The two motor rotation control elements are arranged at a fixed interval.
Are mounted on one wiring pattern.
The rotation control element and this wiring pattern
This wiring pattern is
The above-mentioned problem is solved by being arranged to extend in the opposite direction .

In the present invention according to claim 4,
Each of the motor rotation control elements is constituted by a magnetically sensitive element.
And the one wiring pattern passes through the back side of the wiring board.
To the other wiring pattern.
The pattern is used as the mounting surface, and each motor rotation
The magnetic sensing surface of each control element is orthogonal to this mounting surface.
Solves the problems mentioned above by that.

[0011]

[0012]

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Embodiment 1 Referring to FIGS. 1A and 1B, a device for controlling the rotation of a motor according to Embodiment 1 of the present invention (hereinafter simply referred to as a device).
1 will be described. FIG. 1a is a side view of the device 1 according to the first embodiment, and FIG. 1b is a plan view thereof. The device 1 shown in these figures includes a first and a second semiconductor chip (hereinafter, referred to as a Hall chip) 4 having a magnetically sensitive element such as a Hall element function as a motor rotation control element in the same resin package 2. , 6 are arranged and configured. In this case, the package 2 is formed of a resin in the first embodiment, but is not limited to the resin. In the first embodiment, the motor rotation control element according to the first embodiment is a Hall chip as a magnetically sensitive element when a rotary plate, which is a magnetic encoder, is connected to a rotation shaft of a drive motor. However, if it is an optical encoder, it may be a photosensitive element. Further, the magnetic sensitive element is not limited to the Hall chip, but may be another magnetic sensitive element. Further, although the motor rotation control element in this embodiment is a semiconductor chip, the element is not limited to a semiconductor chip, but may be any element that can be mounted on a resin package.

Further, the device 1 will be described in detail. The device 1 according to the first embodiment has an external appearance in which four lead terminals 12 to 18 and 20 to 26 respectively protrude vertically from both side surfaces 8 and 10 of the resin package 2 in FIG. 1B. Is provided. Of the four first to fourth lead terminals 12 to 18 from one side surface 8 of the resin package 2 and the four fifth to eighth lead terminals 20 to 26 from the other side surface 10, The lead terminal 12 and the eighth lead terminal 28 are formed by using both side portions of a common lead frame 28 extending right and left in the resin package 2 in the drawing. The first and second hole chips 4 and 6 are mounted on the lead frame 28 in the resin package 2 by die bonding at a predetermined distance from each other. The first hole chip 4 is the first
A lead frame 28 portion extending to the lead terminal 12 side;
The second, fifth, and sixth lead terminals 14, 20, and 22 are connected to each of the lead wires 14, 20, and 22 by wire bonding, for example, by a gold wire 30 (the number of the gold wires is one in the illustration). The second hole chip 6 is connected to each of the lead frame 28 extending toward the third, fourth, and seventh lead terminals 16, 18, 24, and the eighth lead terminal 26 by wire bonding with a conductive wire, for example, a gold wire 30. Have been. As described above, the device 1 according to the first embodiment includes the resin package 2 in which the first and second two hole chips 4 and 6 as the motor rotation control elements are the same.
It is housed inside. Each of the Hall chips 4 and 6 has four lead terminals 12 to 18 and 20 to 20 respectively.
Connected to 26 are for power supply, ground, and output, as is well known. Therefore, in the device 1 according to the first embodiment, since the distance between the hole chips 4 and 6 can be arbitrarily set in the resin package 2 accommodating the hole chips 4 and 6, the distance between the hole chips 4 and 6 is reduced. As a result of not being limited by the size, the mounting space in an electronic device, such as an optical disk device, on which the device 1 is mounted can be reduced. Further, since the distance between the hole chips 4 and 6 is not restricted as described above, it is not necessary to lengthen the distance from the center of the rotary plate for the magnetic encoder to the hole chip for the device 1, and low sensitivity, Even a low-cost hall chip can be used for motor rotation control, and as a result, it is advantageous in terms of cost as an electronic device on which the device 1 is mounted. Further, since each hole chip is housed in the same package, the distance between the hole chips 4 and 6 is different from the case where the hole chips 4 and 6 are housed separately in different resin packages as in the conventional case. And the variation of the electromotive force generated in each of the Hall chips 4 and 6 can be suppressed sufficiently small. As a result, a detection output for controlling the rotation of the drive motor can be obtained accurately, and Can eliminate malfunctions.

Second Embodiment A device according to a second embodiment of the present invention will be described with reference to FIGS. 2A and 2B. FIG. 2a is a side view of the device, and FIG. 2b is a plan view thereof. In the device 1a according to the second embodiment shown in this figure, the first and second two hole chips 4 and 6 and the output from each of these hole chips 4 and 6 are binarized in the same resin package 2. A semiconductor chip (hereinafter referred to as a processing chip) 32 to be subjected to a chemical treatment is disposed, and four lead terminals 12 to 18, from both side surfaces 8 and 10 of the resin package 2 in the same manner as in the first embodiment, respectively. 20 to 26 are provided so as to protrude. Four first to fourth lead terminals 1 from one side surface 8 of the resin package 2
Reference numerals 2 to 18 denote individual lead frames. Of the four fifth to eighth lead terminals 20 to 26 from the other side surface 10, the fifth lead terminal 20 and the eighth lead terminal 26 are common lead frames 34. , The sixth lead terminal 22 and the seventh lead terminal 24 are individually configured. A pair of T-shaped individual lead frames 36 and 38 are further provided in the resin package 2. The first and second hole chips 4 and 6 are mounted on the common lead frame 34 in the resin package 2 by die bonding at a predetermined distance from each other, and the common lead frame 34 is
The processing chip 32 described above is mounted thereon by die bonding. The first Hall chip 4 is the first lead terminal 1
2, the second lead terminal 14, the individual lead frame 36, and the common lead frame 34 are connected by wire bonding with gold wires 30. The second hole chip 6 is connected to the third lead terminal 16, the fourth lead terminal 18, the common lead frame 34 and the individual lead frame 38 by the gold wire 30.
Therefore, they are connected by wire bonding. The processing chip 32 is connected to all the lead terminals and the like by wire bonding with gold wires 30.

The circuit configuration of the hole chips 4 and 6 and the processing chip 32 shown in FIG. 2 will be described with reference to FIG. The processing chip 32 includes first and second comparators 40 and 42 and first and second transistors 44 and 4.
6 are built in. A first Hall chip 4, a second Hall chip 6, a first comparator 40,
The second comparator 42, the collector / emitter of the first transistor 44, and the collector / emitter of the second transistor 46 are commonly connected to the power supply Vcc and the ground GND, respectively. Each output terminal of the first Hall chip 4 is connected to a corresponding input of the first comparator 40, and each output terminal of the second Hall chip 6 is connected to a corresponding input of the second comparator 42. Each is connected. The output of the first comparator 40 is connected to the base of the first transistor 44, and the output of the second comparator 42 is connected to the base of the second transistor 46. The collector of the first transistor 44 serves as the output OUT1, and the second transistor 4
The collector 6 is drawn as an output OUT2. Here, since the operation of the above-described circuit configuration is well known, a detailed description thereof will be omitted. However, the first and second hole chips 4 and 6 are provided at the peripheral edge of the rotating plate with the rotation of the rotating plate. 4 in response to the passage of the magnetic poles S and S in FIG.
And outputs the voltage of a waveform that changes as indicated by the symbols, and the respective comparators 40 and 42 and transistors 44 and 46.
Performs an operation of binarizing the voltage output corresponding to the operation.

As described above, the device 1 of the second embodiment
a, the same operation and effects as those of the device 1 of the first embodiment can be obtained, and the device 1a of the second embodiment can be obtained.
In the case (1), since the processing chip 32 is provided in the same resin package 2 together with the hole chips 4 and 6, the device configuration can be made more compact than when the processing chip 32 is separately arranged. Further, since the processing chip 32 can be provided together with the hole chips 4 and 6 in the same assembly process, it is advantageous in terms of cost. Further, since the processing chip 32 is housed in the same resin package 2 as the hole chips 4 and 6, it is possible to obtain a device capable of binarizing and outputting the output of each of the hole chips 4 and 6.

Next, an operation when the device 1 according to the first embodiment of the present invention is disposed so as to face the rotary plate 48 of the magnetic encoder will be described with reference to FIGS. First, the rotating plate 48 has S and N magnetic poles arranged alternately, and the device 1 is arranged on the periphery of the rotating plate 48 which is the magnetic pole end surface. The radius of the rotating plate 48 is r, and the rotating plate 4
Assuming that the distance from the center of 8 to the hole chips 4 and 6 in the device 1 is R and the pitch between the magnetic poles is a, the distance d between the hole chips 4 and 6 is given by the following equation.

D = [a.times. (R / r)]. Times.1 / 4 Therefore, as is clear from this equation, the fact that the distance d between the two hole chips 4 and 6 can be reduced depends on the distance from the center of the rotary plate 48. The distance to the hole chips 4 and 6, the pitch between the magnetic poles, and the radius of the rotating plate 48 can be relatively reduced.

The rotating plate 48 is fixed to a rotating shaft (not shown) of the drive motor, and rotates integrally with the rotating shaft. When the rotating plate 48 rotates in the direction of arrow a in conjunction with the rotation axis of the drive motor, the output voltage from the first Hall chip 4 is applied to the channel ch.
A, assuming that the output voltage from the second Hall chip 6 is channel chB, the rotation speed of the rotary plate 48, that is, the rotation speed of the drive motor is determined from the magnitude of the output from each of the Hall chips 4 and 6, as shown in FIG. Can be detected, and since the phase of the output of the first Hall chip 4 is ahead of the phase of the output of the second Hall chip 6, the rotation direction of the rotary plate 48, that is, the rotation direction of the drive motor is a. Something can be detected. When the rotary plate 48 rotates in the direction of arrow b in conjunction with the rotation axis of the drive motor, the rotation speed of the rotary plate 48 is determined based on the magnitude of the output from each of the hole chips 4 and 6 as shown in FIG. That is, the rotation speed of the drive motor can be detected, and the output phase of the first Hall chip 4 is delayed from the output phase of the second Hall chip 6, so that the rotation direction of the rotary plate 48, Can be detected that the rotation direction is b.

Third Embodiment A device according to a third embodiment of the present invention will be described with reference to FIGS. 7A, 7B, and 7C. FIG. 7a is a plan view of the device, FIG. 7b is a side view, and FIG. 7c is a rear view. The device 1c according to the third embodiment shown in this figure has the same basic configuration as the device 1 according to the first embodiment shown in FIG. 1, but one side of the resin package 2 in the device 1 according to the first embodiment. Side lead terminal 1
2 to 18 are bent from the back surface side of the resin package 2 to the lead terminals 20 to 26 on the other side, and the lead terminals on both sides are bent outward at right angles to form a view on the circuit board 50 as shown in FIG. It is configured such that it can be directly mounted vertically on a wiring pattern (not shown) by soldering. Then, the hole chips 4 and 6 in the resin package 2
7b, the one side surface 52, which is on the left side in FIG. 7b, faces the magnetic pole on the periphery of the rotary plate 48 of the magnetic encoder facing the one side surface 52 at the left side in FIG. The circuit board 50 is formed as a magnetically sensitive surface responsive to the passage of each magnetic pole accompanying the rotation of the lead.
The chip can be mounted so as to be substantially orthogonal to the chip mounting surface 54. Therefore, in the device 1c according to the third embodiment, the magnetic sensing surface 52 of each of the Hall chips 4 and 6 is vertically mounted on the circuit board 50 by making the magnetic sensing surface 52 orthogonal to the mounting surface 54, that is, the circuit board 50 surface. This is effective for detecting the magnetic flux density in the rotation axis direction of the drive motor.

Fourth Embodiment A device according to a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 8a is a side view of the device, and FIG. 8b is a plan view thereof. In the device 1d according to the fourth embodiment shown in FIG.
And the lead terminals 12 to 18 on one side of the resin package 2 from the back side of the resin package 2 to the other side, similarly to the device 1c of the third embodiment. Lead terminals 20 to
26, and each of the lead terminals on both sides is bent outward at a right angle so that it can be directly mounted on the wiring pattern on the circuit board 50 by soldering.
In the device 1d according to the fourth embodiment, similarly to the device 1c according to the third embodiment, one side surface 52 of the hole chips 4 and 6 in the resin package 2 has the magnetic pole on the peripheral surface of the rotary plate 38 of the magnetic encoder. Becomes the magneto-sensitive surface opposite to
It is configured to be mounted so that the lead terminal ends on both sides are substantially orthogonal to the mounting surface on the circuit board 50. Therefore, in the device 1d of the fourth embodiment, the same operation and effect as those of the third embodiment can be obtained.

Fifth Embodiment A device according to a fifth embodiment of the present invention will be described with reference to FIGS. FIG. 9a is a plan view and FIG. 9b is a side view. In the device 1e of the fifth embodiment shown in FIG.
6 are housed in the same resin package 2, the hole chips 4 and 6 are mounted on the front-side wiring patterns 58 and 60 of the double-sided wiring board 56, and the wiring patterns 58 and 60 are respectively mounted on the double-sided wiring board. The structure is extended to the back side 62 of the reference numeral 56 so as to have no lead terminal. The wiring patterns 58 and 60 have the same numbers as the lead terminals 12 to 18 and 20 to 26 and the lead frame 28 in the device 1 (in FIG. 9A, the wiring patterns 58 and 60 are given the same reference numerals as the lead terminals in the illustration). Is the same pattern. One side surface of the hole chips 4 and 6 in the resin package 2 is a magneto-sensitive surface facing the magnetic pole on the peripheral surface of the rotary plate of the magnetic encoder, similarly to the device 1c of the above-described embodiment.

Sixth Embodiment A device according to a sixth embodiment of the present invention will be described with reference to FIG.
Is a processing chip 32 in addition to the device 1e of the fifth embodiment.
The other structure is the same as that of the device 1e of the fifth embodiment.

Seventh Embodiment A device according to a seventh embodiment of the present invention will be described with reference to FIGS. 11A and 11B. In the device 1g according to the seventh embodiment, a device 1g according to the fifth embodiment shown in FIG. One wiring pattern 58 in the device 1e is connected to the wiring board 5
6 extend from the back surface 62 to the other wiring pattern 60 side so that the device 1g can be mounted vertically on the substrate 50. Note that FIG. 11a corresponds to FIG.
Correspond to FIG. 9b, respectively.

Eighth Embodiment A device according to a seventh embodiment of the present invention will be described with reference to FIG.
In the device 1g of the seventh embodiment shown in FIG.
The other configuration is the same as that of the device 1g of the seventh embodiment.

[0028]

As described above, according to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, the motor rotation control device is formed by arranging at least two motor rotation control elements at a predetermined distance from each other in the same package. The distance between the elements is not limited by the size of the package that houses it, so the mounting space in the electronic equipment on which this device is mounted can be reduced, and this element is magnetically sensitive such as a Hall chip. In this case, it is not necessary to increase the distance from the center of the rotary plate, which is a magnetic encoder, to the element, and as a result, there is no need to use a high-sensitivity element as an element, and the device is inexpensive. This makes it possible to reduce the cost of an electronic device on which this element is mounted, and to connect two elements to the same package. Since housed, raised the accuracy of the distance between the elements, resulting in such a drive motor can potentially greatly reduce malfunctions of the drive motor can be obtained accurately detected output to control rotation.

According to the second aspect of the present invention, there is further provided a lead terminal for taking out an output of each of the motor rotation control elements, and the lead terminal extends outward from both side surfaces of the package. For this reason, the lead terminals make it easier to mount the electronic device.

According to the third aspect of the present invention, the element for controlling the rotation of the motor is further constituted by a magnetically sensitive element, and the lead terminal on one side of the package passes through the back surface of the package and is connected to the other side. It is bent toward the lead terminal side, and since the lead terminal side of each side is a mounting surface, and the magneto-sensitive surface of each of the motor rotation control elements is orthogonal to this mounting surface, The structure is effective for detecting the magnetic flux density in the rotation axis direction of the motor.

According to the invention of claim 4, each of the motor rotation control elements is further provided on a wiring pattern of a wiring board, and the wiring pattern is used for extracting the output of each of the motor rotation control elements. This eliminates the need for lead terminals, which is effective in reducing the mounting area in mounting on an electronic device.

According to the fifth aspect of the present invention, at least two wiring patterns are provided on the front surface side of the wiring substrate, and each wiring pattern is extended to the rear surface side of the wiring substrate. When the device is mounted on a circuit board in an electronic device, the mounting area can be further reduced, and the mounting can be made easier and more compact.

According to a sixth aspect of the present invention, each of the motor rotation control elements is constituted by a magnetically sensitive element, and the one wiring pattern extends to the other wiring pattern via the back side of the wiring board. Since the respective wiring patterns are extended and the magneto-sensitive surfaces of the respective motor rotation control elements are orthogonal to the mounting surfaces, the detection of the magnetic flux density in the rotation axis direction of the drive motor is performed. This is an effective structure.

[Brief description of the drawings]

FIG. 1 is a diagram showing a device according to a first embodiment of the present invention, wherein (a) is a side view thereof and (b) is a plan view thereof.

FIGS. 2A and 2B are diagrams showing a device according to a second embodiment of the present invention, wherein FIG. 2A is a side view and FIG. 2B is a plan view.

FIG. 3 is a circuit diagram of a hall chip and a processing chip in a device according to Embodiment 2 of the present invention.

FIG. 4 is a diagram showing an output waveform of a Hall chip according to the first and second embodiments of the present invention.

FIG. 5 is a perspective view of the encoder and the device when the device according to the first embodiment of the present invention is applied to a magnetic encoder.

6A and 6B are diagrams for explaining the operation of FIG. 5, wherein FIG. 6A shows a case where the encoder rotates in the direction of a, and FIG. 6B shows a case where the encoder rotates in the direction of b.

7A and 7B are diagrams showing a device according to a third embodiment of the present invention, wherein FIG. 7A is a plan view thereof, FIG.
(C) is a rear view thereof.

FIGS. 8A and 8B are views showing a device according to a fourth embodiment of the present invention, wherein FIG. 8A is a side view and FIG. 8B is a plan view.

FIG. 9 is a view showing a device according to a fifth embodiment of the present invention, wherein (a) is a plan view and (b) is a side view.

FIG. 10 is a plan view of a device according to Embodiment 6 of the present invention.

11A and 11B are diagrams showing a device according to a seventh embodiment of the present invention, wherein FIG. 11A is a plan view and FIG. 11B is a side view.

FIG. 12 is a plan view of a device according to an eighth embodiment of the present invention.

[Explanation of symbols]

 2 Resin package 4,6 Hole chip 8,10 Resin package side surface 12-16 Lead terminal 20-26 Lead terminal 28 Lead frame 30 Gold wire

Continuation of front page (56) References JP-A-54-148578 (JP, A) JP-A-5-288876 (JP, A) JP-A-6-2733437 (JP, A) JP-A-1-122357 (JP) JP-A-2-151252 (JP, A) JP-A-8-247786 (JP, A) JP-A-53-60169 (JP, A) JP-A-57-32659 (JP, A) 5-190371 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01P 3/487-3/488 G01P 13/04 G01D 5/245 H02K 11/00

Claims (4)

(57) [Claims] 1. A two motor control devices in the same package are disposed at a predetermined distance from each other, the two
Motor rotation control elements are mounted on a common lead frame.
And a common lead frame with each sensor element
And wire bonding to this common lead frame.
Frame is a common terminal for the two sensor elements.
In addition to this, the common terminals are packaged so that they are diagonal.
A motor rotation control device extending from the page . 2. The device according to claim 1, wherein said motor rotation control element is a magnetic sensitive element.
Consists of a child, the one side surface side of the package
The lead terminal passes through the other side of the package
Are bent toward the lead terminal side of
The lead terminal side of the side surface is a mounting surface,
The magnetically sensitive surface of each motor rotation control element is
2. The device for controlling motor rotation according to claim 1, wherein the device is orthogonal to . 3. Two motors rotating in the same package.
Control elements are arranged at a predetermined distance from each other;
Motor rotation control elements are mounted on one wiring pattern
And each motor rotation control element and this wiring pattern
Wire is wire-bonded and this wiring pattern is
Note that the package extends in the diagonal direction of the package.
Motor control device according to symptoms. 4. Each of the motor rotation control elements is magnetically responsive.
And the one wiring pattern is a wiring board.
It extends to the other wiring pattern via the back side,
Each wiring pattern is used as a mounting surface, and
The magnetically sensitive surface of each motor rotation control element is
4. The device for controlling motor rotation according to claim 3 , wherein the device is orthogonal to .