JPS6317046Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a static eliminator that removes static electricity charged on a record using ions generated by corona discharge. The purpose is to make it uniform across the entire board surface regardless of the side.

As shown in FIGS. 1 and 2, the inventor of the present invention uses the base end 5a of the main body case 5 as a static eliminator to remove static electricity from a record.
is pivotally supported on a spindle 2 protruding from a center hole 4 of the
While rotating around the spindle 2 in the circumferential direction above the record, an AC high voltage is applied to the discharge electrode 15 arranged from the base end 5a of the case to the distal end of the case, and ions generated by corona discharge are transferred to the record 3. We considered a configuration that would descend into the sound groove of the sound groove.

Even if the static eliminator of this type is rotated over the record at a constant speed, there will be a difference in the speed at which it traces the record between the center side and the outer circumferential side of the record disk 3. Therefore, if the discharge electrode 15 has a large number of needle-like electrodes 17 projecting downward at equal intervals in the longitudinal direction, more ions will fall on the record surface toward the center of the record 3, causing Otherwise, static electricity may build up. However, if the amount of ion fall at the center of the record is set to an appropriate value, the amount of ions at the outer periphery of the record 3 will be overwhelmingly insufficient.

That is, as shown in FIG. 5, the minute area ds traced by each point of the discharge electrode 15 while the static eliminator a goes around the record becomes larger as it approaches the outer periphery of the record. For example, spindle 2
_{The areas ds 1 and ds o traced by} each point of the width dr in the _parts whose _{distances from o} is equal to the ratio of the radial distance from the center of the record 3, r ₁ / _ro . This means that if the ion density emitted from the discharge electrode 15 is uniform in the radial direction of the record, the number of ions that actually fall per unit area onto the record surface is inversely proportional to the distance from the center of the record. It means becoming smaller.

Focusing on this fact, this invention gradually increases the density of the needle-like electrodes 17 in the discharge electrode 15 as it moves away from the center of the record.
As shown in the figure, by increasing the number of ions descending toward the record 3 in proportion to the radial distance from the center of the record, the number of ions acting on the entire surface of the record becomes constant. In this way, static electricity can be uniformly removed from the record 3, and the center side of the record 3 can be prevented from being charged by excessive ions.

Hereinafter, a specific example thereof will be explained based on the drawings.

In Figures 1 to 3, a is the static eliminator of the present invention, 1 is a turntable for a record player, and 2 is a record player turntable.
3 is a spindle projecting upward from the turntable, and 3 is a record placed on the turntable 1. The spindle 2 passes through the center hole 4 of the record disc 3 and protrudes from the upper surface thereof, and the static eliminator a of the present invention is placed and set on the horizontally supported record disc.

The present static eliminator a has a drive chamber 6 at the base end 5a of a plastic main body case 5 formed in the shape of a long rectangular box along the radial direction of the record disc 3, and an electrode chamber 7 at the case tip 5b. Each section is formed through a partition wall 8. The drive chamber 6 houses a battery 9, a motor 10, and a speed reduction mechanism 11 comprising a gear group. A guide hole 12 into which the spindle 2 is inserted is provided on the lower surface of the base end portion 5a of the case, and a drive wheel 13 is supported by slightly protruding from the lower surface of the case at a position biased toward the distal end of the case with respect to the guide hole 12. . This drive wheel 13 is in contact with the center side label portion of the record disc 3 and is rotationally driven by a motor 10 and a speed reduction mechanism 11. The length of the electrode chamber 7 is slightly larger than the width of the sound groove portion of the record 3, and the lower surface thereof is opened as an ion emitting port 14. A discharge electrode 15 is inserted into the electrode chamber with a discharge electrode 15 covering the ion emitting port 14. located close together.

The discharge electrode 15 has a constant width in the front and back, and a large number of needle-like electrodes 1 extending downward from an electrode plate 16 that is long in the left and right directions.
7 are cut and raised in a line in the longitudinal direction, and both left and right ends of the electrode plate 16 are horizontally mounted on the opposing wall of the electrode chamber 7. However, adjacent needle electrodes 1
₇ , as shown in _FIG .
The distance between the disc 3 and the record 3 is set to be constant. Reference numeral 18 indicates a cut-and-raised hole formed when forming the needle-like electrode 17, and 19 indicates an ion emitting port 1 to prevent electric shock from touching the discharge electrode 15.
It is a net-like protector that is stretched to cover 4.

FIG. 4 shows a high voltage generating circuit 20 that applies an AC high voltage to the discharge electrode 15 to generate corona discharge. This circuit 20 is a saturated type consisting of a feedback coil 21a and a transistor 21b, and a blocking oscillation circuit 21 generates a pulse signal of about 20KHz, and this signal is sent to a step-up transformer 22 from 3 to 30kHz.
By boosting the voltage to about 15KV, a high voltage capable of corona discharge is obtained.

A ventilation window 24 is opened in the upper part of the partition wall 8, and a ventilation fan 25 rotated by a motor 10 together with a drive wheel 13 is installed in the drive chamber 6 through the ventilation window 24.
The structure is such that an air suction port 26 is provided on the outer wall of the drive chamber 6, which is the upper wall in the figure.

Next, to explain how to use the present static eliminator a and its function, set it on the record 3, fit the spindle 2 into the guide hole 12, and turn on the power switch 2.
7, the drive wheel 13 rotates and the main body case 5 rotates around the spindle 2 on the surface of the record disc 3 in the circumferential direction at a constant speed. At the same time, the high voltage generation circuit 20 is also connected to the battery 9, and an AC high voltage is applied to each needle electrode 17 of the discharge electrode 15. As shown in FIG. Corona discharge 28 occurs at 17a and positive and negative ions 29 and 30 are generated. Further, the blower fan 25 is rotated together with the drive wheel 13 by the drive of the motor 10, and outside air flows into the electrode chamber 7 through the air suction port 26 and the blower window 24, and the cut-and-raised hole 18
An air flow 31 is generated that reaches the record surface through the
This airflow 31 forcibly blows positive and negative ions 29 and 30 toward the record 3. When the record 3 is charged with negative ions 32,
The aforementioned positive ions 29 are attracted to the charged part,
Both ions 29 and 32 exchange electrons with each other and are neutralized 3
3.34. The negative ions 30 generated during the corona discharge do not stay on the record, but are blown outward by the air flow 31, and the negative ions 30 do not have any adverse effect during static electricity removal.

Although the illustrated example has been described above, the present invention is not limited thereto. For example, as shown in FIG. 8, the discharge electrode 15 has needle-shaped electrodes 17 projecting downward at equal pitches along the length of the electrode plate 16.
The number of needle electrodes 17 may be increased from the base end of the case to the front end of the case.

Further, the drive wheel 13 may be brought into contact with the outer periphery of the spindle 2 so that the main body case 5 can rotate by itself, or the main body case 5 may be turned by hand by using the drive wheel 13 as an idle wheel. good.

Further, the blower fan 25 may also be supported on the output shaft 10a of the motor 10 in FIGS. 1 and 2 so as to cool the motor 10 at the same time.

The present invention also envisages a usage pattern in which the record disc 3 and then the static eliminator a are placed on a dedicated stand on which the spindle 2 is provided to protrude upward.

Furthermore, it goes without saying that the specific configurations of the discharge electrode 15 and the high voltage generation circuit 20 can be freely changed in design depending on the purpose of their existence.

As explained above, according to the static eliminator according to this invention, a large number of needle-like electrodes 1 provided on the discharge electrode 15
Since the density of ions 7 is made to gradually increase from the proximal end 5a of the main body case 5 toward the distal end, as shown in FIG. Ions from the discharge electrode 15 fall onto the record 3 due to the density distribution.
Therefore, the number of ions falling on the record disc 3 is approximately uniform over the entire disc surface, so that the static electricity charged on the record disc 3 can be evenly removed, and the record disc is not charged by the ions used for static elimination. can also be effectively prevented.

[Brief explanation of drawings]

The drawings illustrate the static eliminator according to the present invention, and FIG. 1 is a longitudinal sectional front view in use, FIG. 2 is a cross-sectional plan view, FIG. 3 is an exploded perspective view, and FIG. 4 is an electric circuit diagram. , Fig. 5 is an explanatory diagram of the relationship between the distance from the center of the record and the ion density, Fig. 6 is a graph showing the relationship between the discharge electrode and the ion density, Fig. 7 is an explanatory diagram showing the static elimination state, and Fig. 8 The figure is a perspective view showing another embodiment of the discharge electrode. 1...Turntable, 2...Spindle, 3
...Record, 4... Center hole of the record, 5
...Body case, 5a...Proximal end of main body case,
5b...Tip of main body case, 6...Drive chamber, 7
... Electrode chamber, 8 ... Partition wall, 9 ... Power supply (battery),
10...Motor, 12...Guide hole, 13...Drive wheel, 14...Ion emission port, 15...Discharge electrode, 16...Electrode plate, 17...Acicular electrode, 17a
... Tip of needle electrode, 18 ... Cut-and-raised hole, 2
0... High voltage generation circuit, 24... Ventilation window, 25...
...Blower fan, 26...Air suction port.

Claims (1)

[Scope of utility model registration request] A main body case 5 in the shape of a long box whose base end portion 5a of the case is pivotally supported by a spindle 2 protruding from a center hole 4 of a record disc 3 and can be rotated in the circumferential direction about the spindle 2 on the record disc; A discharge electrode 15 is arranged from the base end 5a of the main body case 5 to the case distal end side so as to look into the lower surface of the opening of the main body case 5, and a high voltage generation circuit 20 that applies voltage to the discharge electrode 15 to generate corona discharge. The discharge electrode 15 has a large number of needle-like electrodes 17 projecting downward in the longitudinal direction, and the needle-like electrode 1
A record static eliminator in which the presence density of 7 gradually increases from the base end of the case toward the front end of the case.