JPH0559606U - Cassette type magnetic head demagnetizer - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a magnetic head degaussing device suitable for efficiently supplying power to a cassette-type magnetic head degaussing device. [Structure] In a cassette type magnetic head degaussing device, a solar cell is attached to at least one surface of the device so that a light receiving surface is placed on the outside, and electric power from the solar cell is stored between the solar cell and the degaussing circuit portion of the device. Further, an electric storage element that discharges when the degaussing circuit unit operates is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cassette type magnetic head degaussing device, and more particularly to a magnetic head degaussing device suitable for efficiently supplying power to an audio cassette type magnetic head degaussing device.

[0002]

[Prior Art]

 Conventionally, cassette tape recorders (including those with a CD recording / playback function and a radio) have been widely used as devices for recording and playing back music and conversations on audio cassette tapes. The recording / playback head of this cassette tape recorder becomes magnetized after a long period of use, resulting in deterioration of the recording / playback characteristics. To avoid this deterioration, it is necessary to periodically degauss the recording / playback head. An audio cassette type magnetic head degaussing device is a device for degaussing the recording / playback head by a simple operation. An example of this is shown in FIGS.

FIG. 3 shows the appearance of a conventional audio cassette type magnetic head degaussing device, and FIG. 4 shows its internal structure. Further, FIG. 5 shows a partial circuit configuration thereof. In these figures, cassette drive holes 2A and 2B through which the drive shaft of the cassette tape recorder penetrates are formed on the upper and lower surfaces of the cassette case 1, and the erasing head insertion hole of the cassette tape recorder is formed on the front surface. 3, a recording / playback head insertion hole 4 and a pinch roller insertion hole 5 are formed respectively. At the opening of the recording / playback head insertion hole 4, a demagnetizing electromagnet 7 is provided so as to be movable back and forth by elastic pieces 6 whose both ends are supported by the cassette case 1.

A cover 9 made of a non-magnetic material such as a synthetic resin tape is attached to the front surface of the demagnetizing electromagnet 7 (the surface facing the recording / reproducing head 8 of the cassette tape recorder) so that the recording / reproducing head 8 can be directly connected to the demagnetizing electromagnet 7. The demagnetizing electromagnet 7 is prevented from coming into contact with the demagnetizing electromagnet 7, and the head 8 is prevented from being damaged. Further, in the cassette case 1, an annular large-capacity capacitor 10 having a hole having substantially the same diameter as the cassette driving hole 2A is provided around the hole 2A, while on the other hand, around the cassette driving hole 2B, a substantially same diameter is provided. The substrate 11 having the holes is attached.

An oscillator circuit 15 is assembled on the substrate 11 as a drive circuit including a load of the winding 12 of the demagnetization electromagnet 7 and a capacitor-coupled multivibrator including transistors 13 and 14. Further, on the substrate 11, a charging terminal 16 connected to both ends of the capacitor 10, a light emitting diode 17 as a display connected to both ends of the capacitor 10 via a resistor, a capacitor 10 and an oscillation circuit. A switch 18 for connecting 15 and is installed.

The switch 18 is operated by an operating piece 19 fixed to the central portion of the elastic piece 6. A display window 20 and a terminal outlet 21 are formed on the upper surface of the cassette case 1.

In the cassette type magnetic head degaussing device having such a configuration, in order to eliminate the need for an external power supply for charging a capacitor, as shown in FIG. 6, instead of charging the large-capacity capacitor 10 by an external power supply, a battery 22 is used. Also, the DC-DC converter 23 is built in the cassette case 1, the DC voltage of the battery 22 is boosted by the DC-DC converter 23, and the capacitor 10 is charged through the switch 24 by this boosted DC voltage. After charging the capacitor 10, the switch 24 is switched to connect the capacitor 10 to the drive circuit 15 so that the demagnetization electromagnet 7 is strong enough to demagnetize at first and decays to zero with the passage of time. Generate an alternating magnetic field.

Further, in order to be applicable to various cassette tape recorders, a pair of reels are provided in the cassette case and are linked with each other via a transmission means such as a belt, a gear, and a friction wheel. An example of the gear is shown in FIG.

As a power source of the above-mentioned cassette type magnetic head degausser, a small one such as a silver oxide battery, an alkaline battery, a lithium battery, or a so-called button battery is generally mounted on the magnetic head degausser body. It was When the cassette type magnetic head degaussing device is not used, it is usually placed in a storage case.

[0010]

[Problems to be solved by the device]

 However, in the conventional cassette type magnetic head degaussing device, the battery is consumed after about 200 times of use and needs to be replaced. Since such a button battery has a high cost per unit energy capacity, the battery itself is not used. There is a problem that it is more expensive than AA batteries or the like.

Further, since such a primary battery contains mercury and the like, there is a problem that there is a risk of environmental destruction when it is discarded after being used unnecessarily.

The object of the present invention is to solve such a conventional problem, to eliminate the need for a battery built in the head degaussing device main body, and to prevent a fear of environmental damage by providing a clean power supply unit on the main body surface. An object is to provide a cassette type magnetic head degaussing device.

[0013]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a cassette type magnetic head degaussing device of the present invention has a solar cell attached to at least one surface of the device so that a light receiving surface is placed outside, and the demagnetizing circuit part of the solar battery and the device. A characteristic is that a storage element that stores electric power from the solar cell and discharges the stored electric power when the degaussing circuit unit operates is provided between the two.

[0014]

[Action]

 In the present invention, since the solar cell is provided on the surface of the cassette body, the battery inside the body can be eliminated and the trouble of battery replacement can be eliminated.

[0015]

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 2 is an external view of an audio cassette type magnetic head degaussing device according to an embodiment of the present invention. In the figure, 101 is a cassette type magnetic head degaussing device body of the present invention (hereinafter referred to as a cassette body), and 102 is a solar cell (for example, amorphous silicon) attached to the surface of the cassette body 101. Here, the light receiving surface of the solar cell 102 faces the outside of the cassette body 101.

In this embodiment, a solar cell 102 is attached to the surface of the cassette body 101, and the output of the solar cell 102 is electrically connected to an internal electronic circuit (see FIG. 1 described later). As a result, a secondary battery, which will be described later, in the cassette body 101 is charged. With such a configuration, it is possible to eliminate the need for a button battery as a power source of the cassette body 101, and to prevent the possibility of environmental damage due to it. Further, since the solar cell 102 is attached to the surface of the cassette body 101, degaussing operation can be performed simply by placing the cassette body on the dashboard of the automobile, for example, and the degaussing operation becomes simple. ..

FIG. 1 is a diagram showing an example of circuit connection between the internal electronic circuit of the cassette body 101 shown in FIG. 2 and the solar cell 102. In the figure, 102 is a solar cell, 109 is a power storage element for storing electric power from the solar cell 102, 110 is a preceding stage of the power storage element 109, and is a diode for preventing backflow of current to the solar cell side, and 111 is An LED for indicating the end of charging of the electric power from the solar cell 102 to the storage element 109, 112 is an LED lighting control circuit for controlling the lighting of the LED 111, and 113 is a degaussing circuit for degaussing the recording / playback head and the like. Here, the degaussing circuit 113 is the same as the conventional one.

The storage element 109 is capable of storing the electric power generated by the solar cell 102 and extracting the stored electric power when necessary, that is, when the head is demagnetized. Typical examples of the storage element 109 include a nickel cadmium battery as a secondary battery and a lead storage battery, and an electric double layer capacitor having a large amount of electricity and a short charging time. Further, there is a polyacene capacitor having higher capacity, lower impedance, higher withstand voltage and semi-permanent life than the electric double layer capacitor. In other words, the electricity storage element 109 may have the above-mentioned characteristics and be small and lightweight so that it can be built in the cassette body.

When charging of the storage element 109 is completed, the LED lighting control circuit 112 turns on the LED 111, so that it is understood that the cassette body 101 is ready for use. At this time, it is desirable to blink the charging power so that the LED 111 does not consume the charging power as much as possible. Charging is performed by leaving the lamp in an appropriate light source for a certain period of time or more to charge the power for several operations and degaussing the head of the cassette tape recorder.

In the above embodiment, the case where the button battery of the cassette body is not required has been described. However, the button battery can be used as it is, and the solar battery is usually used, and the solar battery cannot be practically used. You may use button batteries in various places to improve usability.

[0021]

[Effect of the device]

 As described above, according to the present invention, the internal battery of the cassette body can be eliminated, so that the space for inserting the battery in the body can be omitted and the fear of environmental damage can be prevented. Further, since the solar cell is used, it is not necessary to replace the cell. Furthermore, because the solar cell is attached to the surface of the cassette body, degaussing can be performed simply by placing the cassette body on the dashboard of the automobile, for example.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of circuit connection between an internal electronic circuit of a cassette body and a solar cell according to an embodiment of the present invention.

FIG. 2 is an external view of a cassette type magnetic head degaussing device of the present embodiment.

FIG. 3 is an external view of a conventional cassette type magnetic head degaussing device.

4 is an internal structural diagram of the cassette type magnetic head degaussing device of FIG. 3. FIG.

5 is a circuit configuration diagram of the degaussing device of FIG. 4. FIG.

FIG. 6 is a diagram showing a modification of the circuit shown in FIG.

FIG. 7 is an external view of a conventional cassette type magnetic head degaussing device provided with a reel and a gear.

[Explanation of symbols]

 101 cassette body 102 solar cell 109 storage element 110 diode 111 LED 112 LED lighting control circuit 113 degaussing circuit

Claims (4)

[Scope of utility model registration request] 1. A cassette type magnetic head degaussing device, wherein a solar cell is attached to at least one surface of the device so that a light receiving surface is placed outside, and the solar cell is provided between the solar cell and the degaussing circuit portion of the device. A cassette-type magnetic head degaussing device, comprising: a storage element that stores electric power from the device and discharges when the degaussing circuit unit operates. 2. The storage element is a secondary battery.
The cassette type magnetic head degaussing device described. 3. The cassette type magnetic head degaussing device according to claim 1, wherein the storage element is an electric double layer capacitor. 4. The cassette type magnetic head degaussing device according to claim 1, wherein the storage element is a polyacene capacitor.