JPH08129021A - Frequency dynamo - Google Patents

Abstract

PURPOSE: To provide a frequency dynamo having an FG pattern enabling the miniaturization of a circuit board and capable of obtaining an FG signal free from noise. CONSTITUTION: A substrate 6 having a frequency current-producing pattern l and the flexible substrate 4 connected to the frequency current-producing pattern 1 and leading out a signal to the outside are provided. The first lead-out wire 2a of the frequency current-producing pattern 1 is formed so as to extend in an inner diameter direction and the second lead-out wire 2b thereof is formed so as to extend in an outer diameter direction. The lacked part 14 of the frequency current-producing pattern 1 is formed between C, C' of the first and second lead-out wires 2a, 2b and the wiring pattern 5 of the flexible substrate 4 is arranged so as to be partially superposed on the notched part 14 and the first and second lead-out wires 2a, 2b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency generator having a frequency power generation pattern.

[0002]

2. Description of the Related Art Conventionally, as a frequency generator of this type,
There was a thing as shown in FIG. 4 and FIG. That is, FIG. 4 is a cross-sectional view of a main part showing a structure of a cylinder motor of a frequency generator in which a conventional FG pattern is formed,
The frequency generator includes a drive magnet 10 in which N poles and S poles are alternately magnetized and rotates integrally with a rotating body (hereinafter referred to as a rotor) 11, and an FG magnetized on an end surface of the drive magnet 10. A magnetic portion 12, a frequency power generation pattern (hereinafter referred to as an FG pattern) 1 arranged on the substrate 6 so as to face the FG magnetized portion 12, and the FG pattern 1
And a flexible substrate 4 which is connected to the substrate 6 and leads a signal to the outside of the substrate 6.

FIG. 5 is a front view showing a connection state of a conventional circuit board on which an FG pattern is formed. A flexible substrate 4 is connected to an FG pattern 1 printed on the circuit board 6 by a VTR cylinder motor or the like. In the structure in which a frequency power generation signal (hereinafter referred to as an FG signal) that is a control signal is taken out to the outside, two terminal portions, which are conductive portions, are required for connecting the circuit board 6 and the flexible board 4. Two FG patterns 1 are drawn out as lead lines 2 outside the concentric circles 6 and terminal portions 3a and 3b are provided therein, and the terminal portion 13 of the wiring pattern 5 of the flexible substrate 4 is provided.
It was connected to a and 13b by soldering or the like.

[0004]

Therefore, the FG pattern structure of the frequency generator constructed as described above is FG
In order to take out the signal via the flexible board, two terminals are required outside the rotor, and the board cannot be miniaturized. Further, there is a dimensional limit in narrowing the interval between the FG pattern lead lines, and it is impossible to bring the lead lines close to each other so that noise can be completely canceled. When connecting the terminals of the flexible board, problems such as short circuits occur. In addition, magnetic flux other than the FG signal, such as leakage of the drive magnet, is generated, resulting in deterioration of the S / N ratio and uneven rotation. In addition, the wiring inside the rotor is such that noise from the drive magnet, coil energization, etc., gets on the leader line of the FG pattern and
There is also a problem that the G signal cannot be generated.

The present invention has been made in order to solve the above problems, and provides a frequency generator having an FG pattern capable of miniaturizing a circuit board and obtaining an FG signal without noise. With the goal.

[0006]

In order to achieve the above object, the present invention provides a drive magnet which is magnetized with N poles and S poles alternately and rotates integrally with a rotor, and an end face of the drive magnet. A magnetized FG magnetized portion, a frequency power generation pattern that is disposed on the substrate so as to face the FG magnetized portion, and a flexible connector that is connected to the frequency power generation pattern and guides a signal to the outside of the substrate. In a frequency generator including a substrate, the frequency power generation pattern has a plurality of power generating line elements formed at equal intervals excluding a missing portion, a connecting line element connecting each power generating line element, and at both ends. The flexible substrate has a terminal portion provided and a lead wire communicating with the terminal portion, and the flexible substrate has a terminal portion and a wiring pattern communicating with the terminal portion, and the terminal portion of the frequency power generation pattern. And the terminal part of the flexible board There as well as conductive, part of the wiring pattern of the flexible substrate is characterized in that it is heavy set to the missing portion of the frequency generator pattern. Also,
The frequency power generation pattern is characterized in that the terminal portion on one end side is drawn out in the inner diameter direction and the terminal portion on the other end side is drawn out in the outer diameter direction. Furthermore, at least a part of the lead wire communicating with the terminal portion on the one end side and the lead wire communicating with the terminal portion on the other end side are on the same straight line toward the center of the frequency power generation pattern. .

[0007]

According to the structure of the present invention, since a part of the wiring pattern of the flexible substrate is overlapped with the missing portion of the frequency power generation pattern, a decrease in the power generation output of the power generating line element at the missing portion is eliminated. It is equivalent to a frequency power generation pattern with no missing parts, supplemented by the wiring pattern of the flexible substrate. Further, in the FG pattern, the terminal portion on one end side is drawn out in the inner diameter direction, and the terminal portion on the other end side is drawn out in the outer diameter direction. Therefore, when connecting with the terminal part of the flexible substrate, a short-circuit between the terminal parts does not occur. Does not occur. Furthermore, since the lead wire that communicates with the terminal portion on the one end side and the lead wire that communicates with the terminal portion on the other end side are at least partially collinear toward the center of the frequency power generation pattern, they are overlapped. Since one lead line has a phase opposite to that of the other lead line, the generated noises are canceled by each other and a noise-free FG signal can be obtained.

[0008]

1 and 2 show an embodiment of the present invention. Components having the same functions and functions as those of the conventional arts shown in FIGS. 4 and 5 will be described with the same reference numerals. Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view showing a connected state of a circuit board having an FG pattern according to the present invention, and FIG. 2 is an FG according to the present invention.
It is a front view which shows the circuit board in which the pattern was formed.

In FIG. 2, the circuit board 6 is formed with a hole 9 through which a rotary shaft (not shown) is inserted. An FG pattern 1 is formed on the circuit board 6. This FG pattern 1 is composed of a pattern of a plurality of power generating wire elements 7 formed radially in a radial direction and a pattern of a plurality of connecting wire elements 8 connecting the ends of each power generating wire element 7. ing. The inner peripheral side end of the power generation line element 7 is connected to the inner peripheral side end of another adjacent power generation line element 7 by a connecting line element 8. Further, the outer side end of the power generating line element 7 is connected to the outer side end of another adjacent power generating line element 7 by a connecting line element 8. Therefore, the FG pattern 1 has a rectangular wave shape as a whole and is arranged in a circular shape.

One end of the FG pattern 1 has a first lead wire 2a.
As the second leader line 2b, the other end of the FG pattern 1 is formed so as to linearly extend in the inner diameter direction toward the center O, and is formed to extend linearly in the outer diameter direction toward the center O. It At this time, the first leader line 2a and the second leader line 2b
Are formed on the same straight line toward the center O. Then, the first leader line 2a and the second leader line 2
Terminal portions 3a and 3b are formed at the tips of the lead wires of b. Further, between the first lead wire 2a and the second lead wire 2b, there is no power generating wire element 7 between C and C ', and a missing portion 14 is formed.

In FIG. 1, the flexible substrate 4 is F
This is for connecting with the FG pattern 1 on the circuit board 6 in order to conduct the FG signal obtained from the G pattern 1 to the outside. The flexible substrate 4 is formed with terminal portions 13a and 13b for connecting the wiring pattern 5 for the lead wire and the FG pattern 1.

Next, the connection between the circuit board 6 and the flexible board 4 will be described with reference to FIG. The flexible board 4 is fixed to the circuit board 6, and the terminal portions 3a and 3b of the circuit board 6 and the terminal portions 13a of the flexible board 4 are fixed.
The opposite terminal portions of 13b are connected by soldering or the like. At this time, at least one of the wiring patterns 5 of the flexible substrate 4 is arranged so as to overlap the first leader line 2a and the second leader line 2b. In addition, the wiring pattern 5 of the flexible substrate 4 is arranged so as to partially overlap the missing portion 14 on the FG pattern 1 side. The wiring lines 5 of the flexible board 4 that is provided to overlap the first lead wire 2a and the second lead wire 2b of the FG pattern 1 and the missing portion 14 are the same pattern. Further, at least a part of the first leader line 2a and the second leader line 2b are arranged on the same straight line toward the center O of the FG pattern.

According to the FG pattern 1 having the above-mentioned structure, as shown in FIG.
2b and the wiring pattern 5 of the flexible substrate 4 for the leader line
Have a form in which they are overlapped in the axial direction, and their shapes and positions are vertically overlapped. Therefore, the overlapped portion has the opposite phase, and the leader line 2
Since noises generated in the wiring pattern 5 can be canceled out from each other, an FG signal having no noise component can be obtained. Further, since the power generation output is reduced by eliminating the space between C and C ′ on the FG pattern 1 side, the wiring pattern 5 of the flexible board 4 that is overlaid acts as a continuous line, and thus it can be used as the power generation line element 7. It becomes possible and the missing part 1
The decrease in the power generation output of the power generating line element 7 in No. 4 is compensated for by the wiring pattern 5 of the flexible substrate 4, and it becomes equivalent to a homogeneous FG pattern with no missing portions. Further, since the connection outside the rotor 11 is made at one place, the circuit board can be downsized.

Next, a different embodiment of the present invention shown in FIG. 3 will be described. In the description of the different embodiments of the present invention, the same reference numerals are given to the same functions and actions as those of the above-described embodiments of the present invention, and the duplicated description will be omitted. The terminal portion 3a of the first lead wire 2a provided on the circuit board 6
Is arranged at a position where an arc is drawn on the inner diameter side, and the second leader line 2
b is formed to extend linearly toward the terminal portion 3a and the center O in the outer diameter direction. That is, the center O, the terminal portion 3a, and the lead wire 2b are arranged on a straight line. The wiring pattern 5 of the flexible substrate 4 is the first lead wire 2 a on the circuit board 6.
And the second lead-out line 2b, and the missing portion 1
4 is arranged so as to overlap. Also in this embodiment, the same operational effects as those in the above embodiment can be obtained.

[0015]

As described above, according to the present invention, since a part of the wiring pattern of the flexible substrate is overlapped with the missing portion of the frequency power generation pattern, the power generation of the power generating line element in the missing portion is performed. The decrease in output is compensated for by the wiring pattern on the flexible substrate, which is equivalent to an FG pattern with no missing parts. Further, in the FG pattern, the terminal portion of the first lead wire is drawn in the inner diameter direction, and the terminal portion of the second lead wire is drawn in the outer diameter direction. Therefore, the FG pattern and the terminal portion which is the conductive portion of the flexible substrate are drawn. However, the number of the circuit boards is reduced from two to one outside the rotor, so that the area of the circuit board can be reduced and the motor can be downsized. In addition, since the connecting portions of the two terminal portions are distant from each other, a defect such as a short circuit does not occur and the workability as well as the quality is improved. Furthermore, the first leader line and the second leader line
Since at least a part of the leader line is on the same straight line toward the center of the frequency power generation pattern, generated noises are canceled by each other, and a noise-free FG signal can be obtained.

[Brief description of drawings]

FIG. 1 is a front view showing a connected state of a circuit board having an FG pattern according to the present invention.

FIG. 2 is a front view showing a circuit board having an FG pattern according to the present invention.

FIG. 3 is an enlarged view of an essential part showing a connection state of a circuit board on which an FG pattern is formed, showing another embodiment of the present invention.

FIG. 4 is a cross-sectional view of a main part showing a conventional cylinder motor structure of a frequency generator in which an FG pattern is formed.

FIG. 5 is a front view showing a connected state of a circuit board on which a conventional FG pattern is formed.

[Explanation of symbols]

 1 Frequency Power Generation Pattern 2a, 2b Lead Wires 3a, 3b Frequency Power Generation Pattern Terminal 4 Flexible Board 5 Flexible Board Wiring Pattern 6 Circuit Board 7 Power Generation Line Element 8 Connecting Wire Element 10 Driving Magnet 12 FG Magnetization Section 13a, 13b Terminal part of flexible board 14 Missing part

Claims (3)

[Claims] 1. A drive magnet having N and S poles alternately magnetized to rotate integrally with a rotor, an FG magnetized portion magnetized to an end face of the drive magnet, and the FG magnetized portion. A frequency power generator comprising: a frequency power generation pattern facing each other on a substrate; and a flexible substrate that is connected to the frequency power generation pattern and guides a signal to the outside of the substrate. Is a plurality of power generating line elements formed at equal intervals excluding the missing portion, connecting wire elements that connect each power generating line element, terminal portions provided at both ends, and a lead wire that communicates with the terminal portions. The flexible substrate has a terminal portion and a wiring pattern communicating with the terminal portion, the terminal portion of the frequency power generation pattern and the terminal portion of the flexible substrate are electrically connected, and the flexible substrate is Wiring pattern A frequency generator characterized in that a part of the core is overlapped with a missing portion of the frequency power generation pattern. 2. The frequency generator according to claim 1, wherein the frequency power generation pattern has a terminal portion on one end side extending in the inner diameter direction and a terminal portion on the other end side extending in the outer diameter direction. 3. The lead wire communicating with the terminal portion on one end side and the lead wire communicating with the terminal portion on the other end side are at least partially on the same straight line toward the center of the frequency power generation pattern. The frequency generator according to claim 2, which is characterized in that.