JPH0728746Y2 - Data line filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention is for a data line in which a pair of magnetic core pieces constituting a core are housed in a pair of cases, and the pair of cases are fixed by a fixture. Regarding filters.

(Prior Art) Conventionally, a data line that connects a main body of an electronic device and its terminal (for example, a computer main body and a display, etc.) is inserted into a through hole of a ring-shaped magnetic core to flow to the data line. It is known to remove noise mixed in a signal.

(Problems to be solved by the invention) In order to reduce the noise of a system including an electronic musical instrument or a plurality of electronic devices with the above filter, it is appropriate to attach the filter to a cable that requires actual measures and perform trial and error. It is common to select a filter with different characteristics. However, for example, when taking measures against a cable or lead wire that has already been wired, after removing the cable or lead wire from the soldered board or connector, replace the magnetic core and replace the original cable or lead wire. It was very troublesome because an experiment was required to repeat the procedure of connecting to a board or connector and measuring.

In order to solve this problem, it has been proposed to use two magnetic core pieces, bring the joint surfaces into contact with each other, and attach them to a cable or a lead wire with a fixing tool. In order to obtain it, the problem is how to reliably join the joining surfaces of the two magnetic core pieces. The fixture has a complicated shape to suppress the displacement and gap of the joining surfaces, which is troublesome and costly. There was a problem of becoming.

In addition, the bonding state may become non-uniform each time an experiment is performed, which makes it difficult to obtain reproducibility of filter characteristics.

An object of the present invention is to provide a data line filter that solves the above problems in the conventional core-divided data line filter and is inexpensive and has excellent reproducibility of filter characteristics.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention has a pair of joint surfaces, and a pair of closed magnetic paths is formed by crimping one joint surface to the other joint surface. A data line filter comprising a core made of a magnetic material core piece and having a data line insertion passage formed between the pair of magnetic material core pieces, and a fixture for fixing the pair of magnetic material core pieces in combination, The pair of magnetic core pieces are housed in a pair of cases with the joint surfaces exposed, respectively, and a pair of outer peripheral surfaces of the pair of cases are fitted with an elastic fixing tool having a shape in which an annular part is cut out, and The fixing tool is locked to the locking portions formed on the pair of cases and positioned at a predetermined position of the pair of cases, and the joining surfaces of the pair of magnetic core pieces are pressed against each other by the elastic force of the fixing tool. It is characterized by that. The invention according to claim 1, wherein a through hole is formed in the pair of cases and a protrusion is formed in the fixture, the fixture is fitted on the outer peripheral surfaces of the pair of cases, and the protrusion is inserted into the through hole to fix the fixture. The magnetic core pieces may be directly pressed by the protrusions by elastic force so that the joint surfaces of the pair of magnetic core pieces may be pressed against each other, or the protrusions formed on the fixture in the recesses formed on the outer peripheral surfaces of the pair of cases. May be fitted, the pair of cases may be joined by the elastic force of the fixture, and the joining surfaces of the pair of magnetic core pieces may be pressed against each other.

(Operation) By inserting an elastic fixing tool having a shape in which an annular part is cut out into the outer peripheral surfaces of the pair of cases, the joining surfaces of the pair of magnetic core pieces housed in the pair of cases are attached. Since the fixtures are pressure-bonded to each other and are locked to the locking portions formed on the pair of cases and positioned at predetermined positions of the pair of cases, the pair of cases and the pair of cases housed in the pair of cases are The magnetic core pieces are not displaced from each other.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.

In the figure, reference numeral 1 denotes a pair of semi-cylindrical magnetic core pieces 1a and 1b each having a joint surface 2 and a closed magnetic path is formed by pressing one joint surface 2 to the other joint surface 2. And a recess 3 is formed in the joint surface 2 of the pair of magnetic core pieces 1a, 1b.
Is a cylindrical core having a data line insertion passage 4 formed between a pair of magnetic core pieces 1a and 1b by forming a core. As an example of the dimensions, the outer diameter is 16
mm, inner diameter 8 mm, length 25 mm. 5a, 5b
Is a semi-cylindrical (for example, 20 mm outer diameter) plastic case that houses the pair of magnetic bodies 1a and 1b of the core 1, and the cases 5a and 5b can be opened and closed by a pair of hinge pieces (not shown). In the closed state, a through hole 7 for inserting a data line is formed in the joint, and the magnetic core pieces 1a and 1b are rattled in the cases 5a and 5b with the joint surface 2 exposed. It is stored without. 8 is an annular shape having almost the same diameter as the cases 5a and 5b (for example, outer diameter dimension 22 mm, inner diameter dimension 20 mm, width
5 mm) having a partially cut-out shape and having elasticity, for example, a nylon fixing tool. This fixing tool 8 is fitted into the outer peripheral surfaces of the pair of cases 5a and 5b joined to each other and the elastic force of the pair of magnetic core pieces The bonding surfaces 2 of 1a and 1b are pressed against each other.

A pair of hook-shaped protrusions 9 and 9 facing each other is formed on the pair of cases 5a and 5b, respectively, and the fixing member 8 is inserted between the hook-shaped protrusions 9 and 9. Fixture 8 is the case
5a and 5b so that they do not easily come off and the case 5a
This is an example in which 5b are not displaced from each other. FIG. 2 shows that a pair of cases 5a and 5b are provided on the outer peripheral surfaces thereof with a locking portion formed of a groove 10 into which the band-shaped fixing tool 8 is fitted, and the fixing tool 8 is locked by the groove 10. This is an example.

FIGS. 3 and 4, FIG. 5, FIG. 6, and FIG. 7 all show modifications of the embodiment shown in FIG.

FIGS. 3 and 4 show a case in which the groove 10 of the pair of cases 5a and 6b is formed in the dovetail groove, and the fixing tool 8 is formed in a dovetail shape that fits in the dovetail groove. FIG. 6 shows an embodiment using a fixture 8 in which a groove 11 is formed on the side wall of the groove 10 of the pair of cases 5a and 5b, and a protrusion 12 which fits into the groove 11 is formed on the side surface.

FIG. 7 shows a pair of angular case 5a as the case,
An example in which 5b is used and the bottom surface of the groove 10 into which the fixture 8 formed in the cases 5a and 5b is fitted is cylindrical. The groove
The bottom surface of 10 may have a rectangular tube shape, and the fixing tool 8 having a shape along the bottom surface may be fitted into the groove 10.

8 to 11 show a through hole 13 and a pair of hook-shaped projecting pieces 9, 9.
A pair of cases 5a each provided with a locking portion consisting of
It is an example using 5b. Protrusions 14 that fit into the through-holes 13 are formed at both ends of the elastic fixture 8 that is substantially the same diameter as the cases 5a and 5b and has an annular shape with a part cut away. To attach the fixture 8 to the cases 5a and 5b,
After inserting the magnetic core pieces 1a and 1b into the cases 5a and 5b shown in the figure, the fixture 8 is attached to the cases 5a and 5b as shown in FIG.
After fitting the cases 5a and 5b, the fixture 8 is slid in the circumferential direction and the projections 14 at both ends thereof are fitted in the through holes 13. In this state, the protrusion 14 directly presses the magnetic core pieces 1a and 1b, and the joint surfaces of the pair of magnetic core pieces 1a and 1b are pressed against each other.

In this example, the cases 5a and 5b are openably and closably connected by the hinge piece 6, but even without the hinge piece 6, it is locked by the hook-shaped projection piece 9 and is fixed by the fixture 8 fitted in the through hole 13. With case 5a
5b never shifts from each other.

In FIGS. 12 and 13, instead of providing grooves along the peripheral surface on the cases 5a and 5b, for example, a circular recess 15 is formed, and the recess 15 is formed.
In this embodiment, the protrusions 14 formed on both ends of the fixture 8 are fitted together.

In this embodiment, a through hole is formed instead of the recess 15, and the protrusions 14 of the fixture 8 fitted into the through hole form the magnetic core pieces 1a, 1b.
May be directly pressed.

(Advantages of the Invention) Since the present invention has the above-described configuration, the joint surfaces of the pair of magnetic core pieces housed in the case do not cause misalignment with each other, and the reproducibility of the filter characteristics is excellent. In addition, the cost is low.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is an exploded perspective view of the second embodiment, FIG. 3 is an exploded perspective view of the third embodiment, and FIG. FIG. 7 is a sectional view showing the engaged state of the case, FIG. 5 is an exploded perspective view of the embodiment of FIG. 4 excluding the core, and FIG. 6 is a sectional view showing the engaged state of the fixing tool and the case. FIG. 8 is an exploded perspective view of the fifth embodiment, and FIG.
FIG. 9 is a sectional view taken along the line XII-XII in FIG. 8, and FIG. 10 is a perspective view showing a mounting process of the fixing tool.
FIG. 12 is a perspective view of the case, FIG. 12 is an exploded perspective view of the seventh embodiment, and FIG. 13 is a side view thereof. 1 ... Core 1a, 1b ... Magnetic core piece 2 ... Joining surface 4 ... Data line insertion passage 5a, 5b ... Case 6 ... Hinge piece 7 ... Data line insertion through hole 8 ... Fixing tool 9 ... Hook-shaped protrusion 10 ... Groove 13 ... Through hole 14 ... Protrusion 15 ... Recess

Claims (3)

[Scope of utility model registration request] 1. A pair of magnetic core pieces each having a joint surface, and a closed magnetic circuit is formed by pressing one joint surface to the other joint surface, and between the pair of magnetic core pieces. In a data line filter comprising a core having a data line insertion passage formed therein and a fixture for fixing the pair of magnetic material core pieces in combination, the pair of magnetic material core pieces are attached to a pair of cases to form front and rear joint surfaces. Each of the housings is exposed and housed, and a pair of outer peripheral surfaces of the pair of cases are fitted with elastic fixing members having a shape of a cutout portion, and the fixing members are locked to the locking portions formed on the pair of cases. Then, the pair of cases are positioned at predetermined positions, and the joining surfaces of the pair of magnetic core pieces are pressure-bonded to each other by the elastic force of the fixing tool. 2. A pair of magnetic cores, wherein a projection formed on the fixture is inserted into a through hole formed in the pair of cases, and the magnetic core piece is directly pressed by the projection by the elasticity of the fixture. 2. The data line filter according to claim 1, wherein the joint surfaces of the pieces are pressed against each other. 3. A pair of magnetic core pieces each having a joint surface, and a closed magnetic path is formed by pressing one joint surface to the other joint surface, and between the pair of magnetic core pieces. In a data line filter comprising a core in which a data line insertion passage is formed and a fixture for fixing the pair of magnetic core pieces in combination, the pair of magnetic core pieces are
The coupling surface is exposed in a pair of cases and stored respectively,
By fitting a fixing tool having elasticity in the shape of an annular cutout on the outer peripheral surfaces of the pair of cases, the protrusion formed on the fixing tool is fitted into the recess formed on the outer peripheral surfaces of the pair of cases, A data line filter characterized in that a pair of cases are joined by the elasticity of a fixing tool, and the joining surfaces of a pair of magnetic core pieces are pressure-bonded to each other.