JP2005064082A - Noise absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noise absorber in which a noise absorption core is fixed to a fixing plate extremely easily and effectively without increasing the number of component items and without requiring a troublesome screwing work, or the like. <P>SOLUTION: In the noise absorber where a tubular noise absorption core 2 is fixed to the circumference of a signal transmission cable 12 being secured to a fixing plate, a substantially square drop hole part 4 having a width L2 wider than the width L1 of the noise absorption core 2 is provided in the fixing plate 3, notch type cable holding parts 5 having corner parts C and E each shaped into a curved surface or a curve are provided on the left and right of the drop hole part, the noise absorption core 2 is dropped into the drop hole part 4, and the signal transmission cables 12 located at the opposite ends thereof are inserted into the cable holding parts 5 and held in place. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, for example, in a laser beam printer or the like, a noise absorbing core is mounted around a signal transmission cable for transmitting a signal such as a print control code or print data, and electromagnetic noise propagating through the signal transmission cable is absorbed. Regarding the noise absorbing device to be removed, in particular, the noise absorbing core can be attached and fixed to the signal transmission cable very easily.

  As is well known, for example, various electronic devices such as laser beam printers have increased line-to-line coupling and interference due to radiation noise, and so-called high-frequency electromagnetic interference that hinders normal operation of such electronic devices is small. Has occurred.

Considering the above points, conventionally, after mounting the noise absorbing core on the signal transmission cable, the entire surface of the noise absorbing core is covered with a conductor, and the noise absorbing core is covered with the signal transmission cable. Some are fixed (for example, see Patent Document 1).
JP-A-11-112185

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However, in the configuration described in Patent Document 1, the noise absorbing core is simply fixed to the signal transmission cable, and this type of noise absorbing device is printed on an electronic device such as a laser beam printer that vibrates. When used as a signal transmission cable that connects between a control unit made of a substrate and the like and a connector provided on the frame of the device, the vibration causes the noise absorbing device to vibrate together with the signal transmission cable, resulting in a noise absorbing core. In some cases, the connection between the control unit or the connector and the signal transmission cable may be disconnected during use of the device.

  As a countermeasure, it is conceivable that a mounting plate is provided on the frame of this type of equipment, and this type of noise absorbing device is fixed to the mounting plate using a fixture or the like. There is a problem that a fixing tool and a screwing work for its attachment are required.

  The present invention has been made to solve the above-described problems, and it is very simple and effective to attach the noise absorbing core to the mounting plate without increasing the number of parts and without requiring troublesome screwing work. An object of the present invention is to provide a noise absorbing device that can be attached.

  In order to achieve such an object, in the invention according to claim 1, in the noise absorbing device in which a cylindrical noise absorbing core is mounted around a signal transmission cable and the noise absorbing core is fixed to the mounting plate, the mounting plate In addition, a substantially rectangular drop hole having a width wider than the width of the noise absorbing core, and a notch-like shape provided on the left and right of the drop hole, and the corners of which are curved or curved. The cable holding portion includes a noise absorbing core dropped into the drop hole portion, and the signal transmission cables located at both ends thereof are inserted into the cable holding portion and held.

In the invention according to claim 2, in the noise absorbing device for mounting the cylindrical noise absorbing core around the signal transmission cable and fixing the noise absorbing core to the mounting plate,
A pair of notch-shaped cable holding portions is provided on the mounting plate, and the signal transmission cables positioned at both ends of the noise absorbing core are inserted and held in the cable holding portions.

  According to a third aspect of the present invention, the height of the substantially rectangular drop hole is set so that the through hole of the noise absorbing core is positioned substantially flush with the upper surface of the mounting plate.

  According to a fourth aspect of the present invention, the notch-shaped cable holding portion is provided in a substantially triangular cable insertion path and the top of the cable insertion path, and the holding hole for inserting and holding the signal transmission cable. And a constriction formed at the boundary between the cable insertion path and the holding hole to prevent the signal transmission cable from being detached.

  According to a fifth aspect of the present invention, the width of the constriction is formed to be substantially the same as or slightly smaller than the diameter of the signal transmission cable.

  According to a sixth aspect of the present invention, a retaining portion is formed in the vicinity of the holding hole on the back surface of the mounting plate of the signal transmission cable.

  According to the configuration of the first aspect of the present invention, the mounting plate has a substantially rectangular drop hole portion having a width wider than the width of the noise absorbing core, and notches on the left and right sides of the drop hole portion. The cable holding portion is formed, the noise absorbing core is dropped into the drop hole portion, and the signal transmission cables located at both ends thereof are inserted and held in the cable holding portion. Is not necessary and does not increase the number of parts. In addition, since mounting work such as screwing is not required, the mounting and fixing work is simple, and the notch-shaped cable holder has a curved or curved corner. The signal transmission cable is not damaged even if vibration is transmitted when the transmission cable is inserted or when the device is used. Therefore, there is an effect that this type of device can be used stably over a long period of time.

  According to the configuration of the second aspect of the present invention, a pair of notched cable holding portions are formed in the mounting plate, and signal transmission cables positioned at both ends of the noise absorbing core are inserted into the cable holding portions. Since it only has to be held, a fixing tool or the like is not required, and the number of parts is not increased. In addition, since an installation operation such as screwing is not required, the installation and fixing operations are simple.

  According to the configuration of the third aspect of the invention, even if the drop hole portion and the cable holding portion are formed close to each other, the bent portion of the signal transmission cable becomes gentle and does not receive stress. . Therefore, it is preferable because the width of the mounting plate can be minimized, and the noise absorbing core can be dropped to the drop hole portion and held securely.

  According to the configuration of the invention described in claim 4, the shape of the notch-shaped cable holding portion is very simple, and the signal transmission cable can be smoothly inserted and held, which is preferable.

  According to the configuration of the fifth aspect of the invention, since the width of the constriction is substantially the same as or slightly smaller than the diameter of the signal transmission cable, the signal transmission cable is hardly detached and the fixing effect is improved.

  According to the configuration of the sixth aspect of the present invention, the signal transmission cable is hardly detached by the retaining portion provided in the vicinity of the holding hole on the back surface of the mounting plate of the signal transmission cable, and the fixing effect is further improved. Therefore, it is preferable.

  In a noise absorbing device in which a cylindrical noise absorbing core is mounted around a signal transmission cable and this noise absorbing core is fixed to a mounting plate, the mounting plate has a width wider than the width of the noise absorbing core. A substantially rectangular drop hole portion whose height is set so that the through hole of the noise absorbing core is substantially flush with the upper surface of the mounting plate, and provided on the left and right sides of the drop hole portion. And a notch-shaped cable holding portion whose corner is curved or curved, and the notch-shaped cable holding portion is connected to the substantially triangular cable insertion path and the top of the cable insertion path. A holding hole for inserting and holding the signal transmission cable, and a constriction formed at a boundary between the cable insertion path and the holding hole to prevent the signal transmission cable from being separated, and Fall Inclusive hole narrowing down the noise absorbent core, and inserting the signal transmission cable located at both ends to the cable holding portion to hold.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic configuration diagram showing a main part of an electronic apparatus provided with a noise absorbing device according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram showing an example of the noise absorbing device shown in FIG. 2 is a cross-sectional view taken along line AA in FIG. 2, FIG. 4 is a side cross-sectional view of FIG. 2, FIG. 5 is an enlarged view showing an example of a notch-shaped cable holding portion, and FIG. It is an expanded sectional view which expands and shows a part of cable-shaped cable holding part further.

Reference numeral 1 denotes a frame body of a laser beam printer which is an electronic device. The frame body 1 includes a control unit 11 including a printed circuit board on which a CPU or the like is mounted, a motor (not shown) which is a vibration source on the back surface, and this motor. A driving source to be driven is provided. A signal transmission cable 12 connects the control unit 11 and the connector 13 and transmits signals such as a print control code and print data.

  Reference numeral 2 denotes a cylindrical noise absorbing core that is mounted around the signal transmission cable 12 and absorbs and removes electromagnetic noise propagating through the signal transmission cable 12, and is made of ferrite (sintered body) or at least a soft magnetic body. An outer package 22 made of, for example, a plastic resin is provided on the outer periphery of a cylindrical or divided core 21 made of a composite magnetic material formed with powder and an organic binder.

  Reference numeral 3 denotes a mounting plate made of, for example, a plastic resin for holding the cylindrical noise absorbing core 2. The mounting plate 3 has a width L2 wider than the width L1 of the noise absorbing core 2 according to the present invention. The substantially rectangular drop hole 4 and the outline, edge E (line intersecting two planes) and corner C (point intersecting three planes) provided on the left and right sides of the drop hole 4. Are formed in a rounded shape, that is, a curved surface (see FIG. 6) or a curved line (see FIG. 5). . And the said noise absorption core 2 is dropped in the said drop hole part 4, and the signal transmission cable 12 located in the both ends is each inserted and hold | maintained from the edge notch to the said cable holding part 5. .

  As shown in FIG. 3, the height L4 of the substantially rectangular drop hole 4 is set so that the through hole of the noise absorbing core 2 is positioned substantially flush with the upper surface of the mounting plate 3. If set slightly smaller than the outer diameter L3 of the core 2, even if the drop hole 4 and the cable holding part 5 are formed close to each other, the bent part of the signal transmission cable 12 becomes gentle and stressed. Nothing will happen. Accordingly, the width of the mounting plate 3 can be minimized, and the noise absorbing core 2 can be dropped into the drop hole 4 to the maximum extent and can be reliably held.

  As shown in FIG. 5, the notch-shaped cable holding portion 5 is provided at a substantially triangular cable insertion path 51 and the top of the cable insertion path 51, and the signal transmission cable 12 is inserted therethrough. The holding hole 52 to be held and the constriction 53 formed at the boundary between the cable insertion path 51 and the holding hole 52 to prevent the signal transmission cable 12 from being separated, the shape thereof is extremely simple, The signal transmission cable 12 can be smoothly inserted and held, which is preferable.

  Further, when the width of the constriction 53 of the cable holding portion 5 is formed to be substantially the same as or slightly smaller than the diameter of the signal transmission cable 12, the signal transmission cable 12 is difficult to be detached from the holding hole 52, and a fixing effect is obtained. improves. In this case, it is a matter of course that even when there are a plurality of signal transmission cables 12, they may be formed so as to be substantially the same as or slightly smaller than one diameter.

  Further, as shown in FIG. 3, when the retaining portion 6 is formed in the vicinity of the holding hole 52 on the back surface of the mounting plate 3 of the signal transmission cable 12, the signal transmission cable 12 is removed from the holding hole 52. Since it becomes difficult to detach | leave and the fixing effect improves further, it is preferable. The retaining portion 6 may be formed by, for example, tying the signal transmission cable 12 at this portion. Of course, it may be formed using a binding band or the like instead.

  In the embodiment having the above-described configuration, the mounting plate 3 has a substantially rectangular drop hole portion 4 having a width L2 wider than the width L1 of the noise absorbing core 2, and the right and left sides of the drop hole portion 4 are cut off. A notch-shaped cable holding portion 5 is formed, the noise absorbing core 2 is dropped into the drop hole portion 5, and the signal transmission cables 12 located at both ends thereof are inserted into the cable holding portion 5 and held. Therefore, a conventional fixture or the like is not necessary, and the number of parts is not increased. In addition, since mounting work such as screwing is not required at all, the mounting and fixing work is simple, and the notched cable holding portion 5 has its corners C and E formed in a curved surface or a curved line. Therefore, even when vibration is transmitted when the signal transmission cable 12 is inserted and when the device is used, the signal transmission cable 12 is not damaged. Therefore, there is an effect that this type of device can be used stably over a long period of time.

  The above-described embodiment is a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention.

It is a schematic block diagram which shows the principal part of the electronic device which provided the noise absorption apparatus by one Example of this invention. It is a schematic block diagram which shows an example of the noise absorber shown in FIG. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. FIG. 3 is a side sectional view of FIG. 2. It is an enlarged view which expands and shows an example of a notch-shaped cable holding part. It is an expanded sectional view which expands and shows a part of notch-shaped cable holding part further.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame 12 Signal transmission cable 2 Noise absorption core 3 Mounting plate 4 Drop-in hole part 5 Notch-shaped cable holding part 51 The substantially triangular-shaped cable insertion path 52 Holding hole 53 Constriction 6 Retaining part C Corner (corner part) )
E Edge (corner part)

Claims (6)

In the noise absorbing device that attaches a cylindrical noise absorbing core around the signal transmission cable and fixes the noise absorbing core to the mounting plate,
The mounting plate is provided with a substantially rectangular drop hole having a width wider than the width of the noise absorbing core, and cuts formed on the left and right sides of the drop hole, and the corners of which are curved or curved. A noise comprising: a notch-shaped cable holding portion, wherein a noise absorbing core is dropped into the drop hole portion, and the signal transmission cables located at both ends thereof are inserted and held in the cable holding portion. Absorber. In the noise absorbing device that attaches a cylindrical noise absorbing core around the signal transmission cable and fixes the noise absorbing core to the mounting plate,
A noise absorbing device characterized in that a pair of notched cable holding portions are provided on the mounting plate, and the signal transmission cables located at both ends of the noise absorbing core are inserted and held in the cable holding portions. . The height of the substantially rectangular drop hole is set so that the through hole of the noise absorbing core is positioned substantially flush with the upper surface of the mounting plate. Noise absorber. The notch-shaped cable holding portion is provided in a substantially triangular cable insertion path, the top of the cable insertion path, a holding hole for inserting and holding the signal transmission cable, and the cable insertion path and the holding The noise absorbing device according to claim 1, further comprising: a constriction formed at a boundary with the hole to prevent detachment of the signal transmission cable. 5. The noise absorbing device according to claim 4, wherein a width of the constriction is formed to be substantially the same as or slightly smaller than a diameter of the signal transmission cable. The noise absorbing device according to claim 4, wherein a retaining portion is formed in the vicinity of the holding hole on the back surface of the mounting plate of the signal transmission cable.

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