JPH0590859U - Filter connector - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a filter connector that is easy to assemble and manufacture, is robust against external force, etc., and has excellent filter characteristics capable of miniaturization and high density. [Configuration] A contact opening 12 and a capacitor opening 13 penetrating between both main surfaces 14 and 16 of a magnetic substrate 11 such as ferrite.
Are formed correspondingly. The contact 20 is press-fitted into the contact opening 12, and the capacitor opening 13 has electrodes at both ends.
A cylindrical capacitor 30 having 32, 33 is inserted. One end of the cylindrical capacitor 30 is commonly connected to a grounding conductive layer 15 formed on one main surface 14, and the other end is a corresponding contact 20 via a conductive path 17 formed on the other main surface 16. Connected to. The length of the cylindrical capacitor 30 and the thickness of the magnetic substrate 11 are selected to be substantially equal, and the electrodes 3 at both ends of the cylindrical capacitor 30 are selected.
Reference numerals 2 and 33 are arranged to be substantially flush with the main surfaces 14 and 16 of the magnetic substrate 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electrical connector, and more particularly to a filter connector that filters unnecessary noise components in a signal flowing through a contact.

[0002]

[Prior Art]

 In the case of high-sensitivity electronic equipment such as audio equipment and communication equipment and digital equipment that uses a large number of digital ICs that operate on and off, noise that is generated inside these equipment or that is mixed in from other equipment via the power supply or the like It's sensitive. Especially in the case of audio equipment used in automobiles, the noise generated from the ignition device of the engine or the motor is extremely large.Therefore, a filter is integrated into the connector used for interconnection, and the noise is inserted through this. It is necessary to attenuate the noise that is mixed in or transmitted. Also, since many electronic office equipment and electronic measuring instruments are used in close proximity in offices and laboratories, it is necessary to reduce noise as much as possible by using filter connectors. Due to these circumstances, the standards for noise such as FCC are becoming more and more strict, and it is becoming difficult to use electronic devices without noise countermeasures.

Various types of filter connectors have been proposed and are being widely used. An example of a conventional filter connector is disclosed in Japanese Utility Model Publication No. 59-4549. In this conventional filter connector, one end of a chip-shaped capacitor is connected to a printed circuit board having an opening through which a post-shaped contact is inserted, and the other end is connected to a common ground conductor. Alternatively, a feedthrough capacitor is soldered to a conductive plate, and a contact is inserted through the center of the conductive capacitor for soldering to fix the whole with an insulating material.

For high-density connectors, a filter connector has also been proposed in which a capacitor is formed on the surface of an insulating substrate by a thick film technique or the like to connect to each contact (eg, US Pat. No. 4,682,129). And No. 4,791,391).

[0005]

[Problems to be solved by the device]

 However, since such a conventional filter connector uses only a capacitor as a filter element, the filter characteristics are not sufficient, and a relatively large space is required for a feedthrough capacitor or a chip capacitor, so a high density filter connector is required. Is difficult to achieve. In addition, the soldering and connecting work of the capacitor and the contact is complicated, and the manufacturing cost is high. Furthermore, arranging or forming chip-shaped or thick-film capacitors on the surface of the board is relatively complicated and expensive in the manufacturing process, and the capacitors are easily damaged due to external damage during handling. There was a drawback that it was difficult to confirm whether the capacitor was normal.

Therefore, an object of the present invention is to propose a filter connector which can be formed in a relatively small size and a high density, is robust, is easy to handle, and is simple and inexpensive to manufacture.

[0007]

[Means for solving the problem]

 According to the filter connector of the present invention, a magnetic substrate such as ferrite having a predetermined thickness is used. A plurality of post contact openings and capacitor openings penetrating between both main surfaces of the magnetic substrate are formed. A ground conductor layer is formed on one surface of the magnetic substrate, and a conductive path that interconnects the capacitor opening and the contact opening is formed on the other surface. Insert the post contact into the contact opening and the cylindrical capacitor into the capacitor opening. The electrodes on both ends of this cylindrical capacitor are soldered to the ground conductor and one end of the conductive path, and the contact is connected to the other end of the conductive path. As a result, an inverted L-shaped filter including the inductance of the magnetic substrate and the capacitance of the cylindrical capacitor is formed on each post contact.

[0008]

[Action]

 A series inductance and a parallel capacitance are formed in each contact of the filter connector. Therefore, the noise component flowing through each contact is effectively reduced with a large attenuation over a wide frequency band. That is, the inductance prevents the noise component flowing through the contact from flowing into the circuit through the contact, and guides the noise component that has passed through to the ground via the capacitance. As a result, it has a large noise reducing effect as compared with a conventional noise filter using only a capacitor. Also, the cylindrical capacitor is completely housed in the opening of the magnetic board, and only the electrodes on both ends are on the same plane as both main surfaces of the magnetic board, so soldering work is easy and damage due to external force during handling. There is no fear of doing it.

[0009]

【Example】

 Hereinafter, preferred embodiments of the filter connector of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a main part of a filter connector 10 according to the present invention. In the specific embodiment shown in FIG. 1, a magnetic substrate 11 such as ferrite having a plate thickness of about 3 mm is used. Two rows of contact openings 12 penetrating between both main surfaces of the magnetic substrate 11 and two rows of capacitor openings 13 corresponding to the contact openings 12 are formed inside the contact openings 12. As will be described later with reference to FIG. 2, a conductive layer 15 for grounding is formed on the entire main surface 14 of the magnetic substrate 11, and the other main surface 16 has openings 12 for contacts and openings for capacitors. Conductive paths 17 having both ends at are independently formed.

A plurality of (30 in the specific embodiment shown in FIG. 1) post contacts 20 are provided in the contact opening 12 of the magnetic substrate 11 having the above-described configuration from the other main surface 16 side toward the one main surface 14 side. Pressed and held. Each post contact 20 has, for example, a connection portion 21 having a substantially square cross section and a contact portion 22 with a mating connector. That is, the connecting portion 21 projects from each contact opening 12 toward the one main surface 14 side of the magnetic substrate 11 and is soldered to, for example, a through hole of a circuit board (not shown). The connecting portion 21 may be bent at a right angle to the main surface 14 of the magnetic substrate 11 to form a right angle connector. In FIG. 1, a part of the contacts 20a is shown pressed into the magnetic substrate 11, while the remaining contacts 20b are shown before being pressed. The press-fitted contact 20a is soldered to one end of the conductive path 17 on the other main surface 16 of the magnetic substrate 11. The same applies to the cylindrical capacitor 30.

A cylindrical capacitor 30 is inserted into the capacitor opening 13 of the magnetic substrate 11. Such a cylindrical capacitor 30 may be, for example, a surface mount (MELF type) capacitor commercially available from Taiyo Yuden Co., Ltd. That is, it is a cylindrical capacitor having electrodes formed at both ends, and the main body 31 has a total length of about 3 mm, and electrodes 32, 33 having a thickness of about 0.2 mm are formed at both ends. Here, the cylindrical shape does not necessarily need to have a circular cross section, and may be a square or another polygon. In the particular embodiment of FIG. 1, the cross section is circular. Therefore, when the cylindrical capacitor 30 is inserted into the capacitor opening 13 of the magnetic substrate 11, the main body portion 31 thereof is substantially completely housed in the capacitor opening 13 of the magnetic substrate 11, and the electrodes 32 and 33 are formed. It slightly projects from both main surfaces 14 and 16. The electrodes 32 and 33 of each cylindrical capacitor 30 are soldered to the other end of the conductive path 17 and the ground conductor layer 15, respectively.

FIG. 2 is a partial cross-sectional view of the filter connector 10 of FIG. 1, showing a contact 20 and a cylindrical capacitor 30 arranged and connected to the contact opening 12 and the capacitor opening 13 of the magnetic substrate 11. .. As is apparent from the left end portion of FIG. 2, the body portion 31 of each cylindrical capacitor 30 is substantially completely contained in the capacitor opening 13 of the magnetic substrate 11, and only the electrodes 32 and 33 of the magnetic substrate 11 are provided. It is exposed from both main surfaces 16 and 14. Therefore, it is possible to easily solder and connect to the ground conductor layer 15 and the conductive path 17 of the cylindrical capacitor 30. Further, it is possible to effectively prevent the cylindrical capacitor 30 from being destroyed by collision or contact with, for example, the contact 20 of another filter connector 10 during handling of the filter connector 10.

FIG. 3 is a sectional view of a filter connector assembly for a circuit board using the filter connector according to the present invention of FIG. The filter connector assembly 50 of FIG. 3A is an example of a right angle connector in which the filter connector 10 of FIG. 1 is housed in the insulating housing 51. The filter connector 10 is brought into contact with the shoulder 53 of the insulating housing 51 from the opening 52 on the back surface of the insulating housing 51, and fixed by using the elastic filter holding / grounding member 54 at least at both ends behind the shoulder 53. .. The grounding terminal 55 of the grounding member 54 and the connection portion 21 of each contact 20 bent at right angles are inserted into the contact through holes 61 and the grounding through holes 62 of the circuit board 60 and soldered. The ground conductive layer 15 on the back surface of the filter connector 10 may be connected by soldering, and the filter connector 10 and the insulating housing 50 may be fixed with an adhesive or the like as necessary.

In the filter connector assembly 50 ′ of FIG. 3B, the filter connector 10 is placed directly on the grounding conductive layer 63 of the circuit board 60 and is grounded by soldering if necessary. 3 is different from the filter connector assembly 50 of FIG.

It is needless to say that the filter connector 10 of the present invention can be applied not only to the right angle filter connector assembly but also to a vertical type filter connector assembly mounted vertically to the surface of the circuit board 60.

The filter connector of the present invention has been described above in detail based on the preferred embodiments and application examples. However, the present invention should not be limited to only these embodiments, and various modifications can be made if necessary. It will be easily understood by those having ordinary skill in the art. For example, the capacitor openings may be located outside the two rows of contact openings. Further, the filter connector of the present invention can be used by directly mounting it on a circuit board without using an insulating housing or the like.

[0018]

[Effect of the device]

 According to the filter connector of the present invention, the plate thickness of the magnetic substrate having the thickness required to obtain the desired filter characteristics is positively utilized, and it is effectively combined with the commercially available cylindrical capacitor having the electrodes at both ends. As a result, the cylindrical capacitor is housed inside the capacitor opening of the magnetic substrate. Therefore, since the filter capacitor does not protrude from the surface of the magnetic substrate, high-density mounting is possible, workability such as soldering is excellent, and external force is applied to the capacitor while handling the filter connector, causing problems such as damage. It has a remarkable practical effect that fear can be completely eliminated.

[Brief description of drawings]

FIG. 1 is a perspective view for explaining a preferred embodiment of a filter connector of the present invention.

FIG. 2 is a partial cross-sectional view showing an assembled state of the filter connector of FIG.

FIG. 3 is a cross-sectional view of a practical filter connector assembly for circuit boards using the filter connector of FIG.

[Explanation of symbols]

 10 Filter connector 11 Magnetic substrate 12 Contact opening 13 Capacitor opening 20 Contact 30 Cylindrical capacitor

Claims (1)

[Scope of utility model registration request] 1. At least one contact is inserted into a contact opening penetrating between both sides of a magnetic substrate, and a cylindrical capacitor is inserted into the capacitor opening, and one end of the cylindrical capacitor is connected to the contact. A filter connector, wherein an end is commonly grounded on one surface of the magnetic substrate.