JPH064433Y2 - Direct connection motor for rotary head drum - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a direct drive motor used as a drive source for a rotary head drum in a digital audio tape recorder, a video tape recorder, or the like.

[Conventional technology]

Conventionally, for example, in a direct connection motor for a rotary head drum of a video tape recorder, a frequency detection signal generation pattern for generating a frequency detection signal on the surface of a substrate provided on the stator side and a phase detection for generating a phase detection signal. It is known that a signal generating pattern is formed and a magnet facing the substrate is magnetized with a frequency detection signal magnetic field and a phase detection signal magnetic field. However, in this direct-coupled motor, a frequency detection signal component is generated in the phase detection signal generation pattern by the magnetic field for frequency detection signal of the magnet, and conversely, a phase detection signal component is detected in the frequency detection signal generation pattern by the phase detection signal magnetic field. There is a problem that a signal component is generated and mutual interference between signals occurs.

In order to solve this problem, the direct connection motor is installed in FIG.
It is conceivable to improve it as shown in FIG. That is, in FIG. 4, the core 2 around which the drive coil 1 is wound
Is fixed to the lower surface side of the substrate body 4'a in the figure in the metal substrate 4'made of iron or the like via the spacer 3, and the stator substrate 5 is attached to the upper surface side of the substrate body 4'a. Constitutes the stator part. The stator portion is attached to the stator attachment portion 7a of the rotary head drum 7 by means of the internal thread 6.

As shown in FIG. 5, a frequency detection signal generating pattern 8'is formed on the lower surface of the substrate body 4'a by a conductor through an insulator (not shown). Further, a conductor is provided on the inner surface side of the protrusion 4'b which is provided so as to project radially outward from the outer peripheral portion of the substrate body 4'a and is bent downward by approximately 90 ° with respect to the substrate body 4'a. Thus, the phase detection signal generating pattern 9'is formed. One end of each of the frequency detection signal generation pattern 8'and the phase detection signal generation pattern 9'is used as a frequency detection signal extraction terminal portion and a phase detection signal extraction terminal portion formed on the substrate body 4'a. The other ends of the frequency detection signal generating pattern 8'and the phase detection signal generating pattern 9'are connected to the substrate while being connected to the detection signal extracting land 8'a and the phase detection signal extracting land 9'a. It is connected to a common land 10 formed on the body 4'a.

As shown in FIG. 6, the three lands 8'a, 9'a, 1
0 is a jumper 1 which is inserted through a hole 12 provided in the metal substrate 4 '.
13 and the solders 14 ... 14 are connected to the lands 15 ... 15 provided on the upper surface of the stator substrate 5, and the lands 15 ...
15 are connected to a connector 16 for external connection via a conductor pattern (not shown) on the stator substrate 5.

A drive magnet 18 and a frequency / phase detection signal magnet 19 are attached to a rotor case 17 made of magnetic metal, and these compose a rotor portion. This rotor portion is connected to a rotor shaft 7b of a rotary head drum 7 via a rotor. It is attached to the attachment portion 7c with a saw screw 20. A magnetic field for frequency detection signal is magnetized on the magnetized surface 19a for frequency detection signal facing the substrate body 4'a of the magnet 19 for frequency and phase detection signal, while a phase detection signal opposed to the protrusion 4'b is magnetized. The magnetic field for phase detection signal is magnetized to the magnetizing surface 19b.

In the above direct-coupling motor, the frequency / phase detection signal magnet 19 in the rotor portion rotates, so that the frequency detection signal generation pattern 8 ′ and the phase detection are generated based on the frequency detection signal magnetic field and the phase detection signal magnetic field. A frequency detection signal and a phase detection signal are generated by the signal generating pattern 9 ', respectively. In this case, as a result of the frequency detection signal magnetic field and the phase detection signal magnetic field being magnetized on different surfaces of the frequency and phase detection signal magnet 19, the frequency detection signal magnetic field is the frequency detection signal generation pattern 8 '. On the other hand, the magnetic field for the phase detection signal acts only on the pattern 9'for generating the phase detection signal, so that mutual interference does not occur between the frequency detection signal and the phase detection signal.

[Problems to be solved by the invention]

However, in the direct coupling motor shown in FIGS. 4 to 6, the phase detection signal generating pattern 9'is provided on the substrate body 4'a.
Since it extends upward and is connected to the phase detection signal extracting land 9'a on the substrate body 4'a, the phase is formed at the bent portion between the protrusion 4'b and the substrate body 4'a. There is a risk that the detection signal generating pattern 9'will be cut off or defective in insulation.

Further, at the phase detection signal generating pattern 9'extended on the substrate body 4'a, the frequency detection signal magnetizing surface 19 is formed.
There is a problem that a frequency detection signal component is generated by the frequency detection signal magnetic field from a.

[Means for solving problems]

In order to solve the above-mentioned problems, the rotary head drum direct-coupling motor according to the present invention is bent in the substrate body substantially perpendicularly to the surface of the substrate body, and the magnetic field for the phase detection signal of the magnet is magnetized. A projection part facing the surface, and a phase detection signal generating pattern and a phase detection signal extracting terminal part connected to an end of the phase detection signal generating pattern formed on the surface of the projection part. is there.

[Action]

According to the above configuration, by arranging the phase detection signal generating pattern and the phase detection signal extracting terminal portion on the same surface on the protrusion, the phase detection signal generating pattern is provided between the protrusion and the substrate body. Since it is no longer necessary to pass through the bent portion, the phase detection signal generating pattern is less likely to be cut or have insulation failure.

Further, since the phase detection signal generation pattern is not extended on the substrate body, the frequency and the frequency detection signal magnetic field of the phase detection signal magnet do not generate a frequency detection signal component in the phase detection signal generation pattern.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

As shown in FIG. 3, the direct coupling motor for the rotary head drum of the digital audio tape recorder or the video tape recorder according to this embodiment has basically the same configuration as the direct coupling motor of FIGS. 4 to 6. Therefore, the same members are given the same reference numerals and the description thereof will be omitted.

As shown in FIGS. 1 and 2, in the present embodiment,
The frequency detection signal generating pattern 8 is formed of a conductor on the lower surface side of the substrate body 4a of the metal substrate 4 via an insulator (not shown), and the frequency detection signal is extracted at both ends of the frequency detection signal generating pattern 8. The frequency detection signal extracting lands 8a, 8a serving as a terminal portion are provided by a conductor. Land 8 for extracting frequency detection signal
a and 8a are connected to lands (not shown) on the stator substrate 5 by jumpers (not shown) inserted through the holes 12 of the substrate body 4a.

A protrusion 4b is provided so as to protrude radially outward from the outer peripheral portion of the substrate body 4a, and a U-shaped cutout 4c is further provided on the protrusion 4b. A pattern 9 for generating a phase detection signal is formed on the protrusion 4b with a conductor via an insulator. In addition, in a portion surrounded by the notch 4c in the inner portion of the protrusion 4b, a portion 1 as a phase detection signal extraction terminal portion is provided.
The pair of phase detection signal extraction lands 9a, 9a are formed of a conductor, and both ends of the phase detection signal generation pattern 9 are connected to the phase detection signal extraction lands 9a, 9a.

The protruding portion 4b is bent downward at substantially a right angle at the position of the bending line l-l. The position of the bending line l-l is set so that a predetermined space is provided between the protrusion 4b and the frequency / phase detection signal magnet 19 after bending. As shown in FIG. 2, the portion of the protruding portion 4b where the phase detection signal extracting lands 9a and 9a are provided protrudes above the substrate main body 4a after the protruding portion 4b is bent, and the metal substrate 4b and the stator substrate 5 are connected to each other. In the coupled state, the protrusions project above the stator substrate 5.

The phase detection signal extracting lands 9a, 9a protruding above the stator substrate 5 are connected to the lands 22 formed on the outer peripheral portion of the stator substrate 5 by the solder 14, and the lands 22 are conductor patterns (not shown) on the stator substrate 5. Is connected to the connector 16 via.

In the above-mentioned structure, when the rotor portion rotates, FIG.
Similar to the direct coupling motor shown in FIG. 6, the frequency detection signal generating pattern 8 is generated based on the frequency detection signal magnetic field and the phase detection signal magnetic field from the frequency and phase detection signal magnet 19.
And a phase detection signal generation pattern 9 generate a frequency detection signal and a phase detection signal, respectively, and these signals are taken out through the respective signal taking-out lands 8a and 9a and the connector 16 and the like, and the frequency of the rotary head drum 7 is taken out. And the phase is detected. Since the phase detection signal extraction land 9a is directly connected to the land 22 of the stator substrate 5, a jumper for connecting to the land of the stator substrate 5 is not required on the side of the phase detection signal extraction land 9a.

By providing the notch 4c in the protrusion 4b, the phase detection signal extraction lands 9a, 9a in the protrusion 4b are formed.
It is not essential that the portion provided with is projected onto the stator substrate 5 to directly connect the phase detection signal extraction lands 9a and 9a to the lands of the stator substrate 5, and the phase detection signal generation pattern 9 and the phase detection Land 9a for signal extraction,
It is sufficient that 9a and 9a are provided on the same surface on the protrusion 4b.

[Effect of device]

Since the rotary head drum direct-coupling motor according to the present invention is configured as described above, since the phase detection signal generation pattern and the phase detection signal extraction terminal portion are arranged on the same surface on the protrusion, It is not necessary for the phase detection signal generating pattern to pass through the bent portion between the protrusion and the substrate body. Therefore, cutting of the phase detection signal generating pattern and insulation failure are less likely to occur.

Further, since the phase detection signal generation pattern is not extended on the substrate body, the frequency detection signal magnetic field does not generate a frequency detection signal component in the phase detection signal generation pattern, and as a result, highly accurate phase detection is achieved. The effect is that a signal can be obtained.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a bottom view of a metal substrate, FIG. 2 is an enlarged cross-sectional view of an essential part, and FIG. 4 is a front view showing a directly connected motor in which a phase detection signal generating pattern is provided on a protrusion of the metal substrate with a part broken away, and FIG. 5 is a metal substrate in the directly connected motor of FIG. Fig. 6 is a bottom view of Fig. 4
It is a principal part expanded sectional view of the direct coupling motor of the figure. 4 is a metal substrate (substrate), 4a is a substrate body, 4b is a protrusion, 9 is a phase detection signal generation pattern, 9a is a phase detection signal extraction land (phase detection signal extraction terminal portion), 19
Is a magnet for frequency and phase detection signals, and 19b is a magnetized surface of the magnetic field for phase detection signals.

Claims (1)

[Scope of utility model registration request] 1. A substrate main body having a frequency detection signal generating pattern and a frequency detection signal extracting terminal portion connected to an end portion of the frequency detection signal generating pattern on a surface, and facing the surface of the substrate main body. For a rotary head drum, in which a magnetic field for frequency detection signals is magnetized on a surface to be rotated and a magnetic field for phase detection signals is magnetized on a surface perpendicular to the surface of the substrate body, and the magnet is rotatably arranged. In the direct-coupling motor, the substrate body is provided with a protrusion that is bent substantially perpendicular to the surface of the substrate body and faces the surface of the magnet that is magnetized with the magnetic field for phase detection signal. A direct connection motor for a rotary head drum, wherein a detection signal generation pattern and a phase detection signal extraction terminal portion connected to an end of the phase detection signal generation pattern are formed.