KR20050012971A - Emi shielding device - Google Patents

Abstract

PURPOSE: An EMI(electromagnetic interference) shielding device is provided to prevent an operating error caused due to EMI, by absorbing and shielding EMI generated during operation of a set-top box through the use of a shielding case and a conductor layer of an upper cover for forming a predetermined shielding space. CONSTITUTION: An EMI shielding device comprises a lower casing(10), a shielding case(20), and an upper cover(30). The shielding case is fixed at the lower case in such a manner that the shielding case surrounds components including a hard disk drive and a tuner. The shielding case has a bottom surface(22) and side surfaces(23) extended upward from four edges of the bottom surface. The upper cover is coupled to the lower casing, and has an inner surface with a conductor layer(35). The conductor layer contacts the tops of the side surfaces of the shielding case so as to form a predetermined shielding space when the upper cover is coupled to the lower casing.

Description

EM Eye Shielding Device {EMI SHIELDING DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for shielding electromagnetic interference (Electro-Magnetic Interference: hereinafter referred to as 'EMI') generated when using various electrical and electronic products, and more particularly, to have an image information storage medium having the same application. It relates to an EMI shield of a set-top box.

EMI refers to noise that impedes the operation of other devices or systems. EMI shielding surrounds any part of the space with electrical conductors and prevents the influence of electromagnetic fields from the outside, such as internal electrical equipment, or vice versa. It means that the influence does not reach the outside.

Such EMI is generated by many different types of operation of electronic devices from microwave devices to home computers. The source of this EMI is that electronics generate pick-up noise by conduction through power lines that act as other devices or antennas in the frequency range from as low as 60Hz to as high as 1000MHz.

EMI is well known for affecting such various problems as disturbing other devices and disturbing police car radio networks, communication systems, precision test equipment and cardiac pacemakers, and is known to adversely affect the human body. .

Accordingly, countries around the world are making efforts to prevent malfunctions of devices caused by EMI and to protect users from harmful environments by determining and implementing EMI standards in recognition of the harmfulness of EMI. In the United States, for example, the minimum allowable EMI emission rule has been in force since 1983 for all digital electrical and electronic products generating or using frequencies between 10KHz and 1000MHz.

In line with this global trend, leading electronics manufacturers around the world are speeding up the study of effective shielding and shielding of EMI, which will be an important point in determining the life and death of products as consumer demand grows. It is self explanatory.

On the other hand, the set-top box is a communication terminal device for restoring the compressed signal transmitted from the video server through the digital network to the original video and audio signals. When the digitalized information is received from the service providing server in the set-top box, the set-top box converts the input digital signal into a displayable format if there is a video signal and converts the input digital signal into an analog signal so that the audio signal can be output through a speaker. Convert. These set-top boxes are used to build Video On Demand (VOD) systems.

However, the general set top box as described above does not have any function other than a function of converting a broadcast signal in real time. When using such a set-top box, a broadcast source such as a broadcaster propagates various broadcast information and video information through a satellite in real time, and viewers can turn on the TV and watch in real time, or by using a VCR having a recording function. It is inconvenient to watch after recording a variety of video information screened in the impossible time period.

A set-top box having an image information storage medium filed by the present applicant as the same as the present invention stores at least some of various broadcast signals propagated in real time or various image information transmitted together with the broadcast signals regardless of time. It has a function to play and watch at a desired time.

Inside the set-top box as described above, a main board on which various electronic chips are mounted, a hard disk drive as an image information storage medium, and a component such as a tuner for selecting received radio waves are installed. There is a need to shield and block effectively.

The present invention by effectively shielding and blocking the EMI generated when using the set-top box having the image information storage medium, such as the filed as the same file, it is possible to prevent the operation error of the peripheral devices due to EMI, and also to protect the user from the EMI The purpose is to provide an EMI shield.

1 is an exploded perspective view of a set-top box having an image information storage medium to which the EMI shielding device is applied according to an embodiment of the present invention;

2 is a cross-sectional view of the assembled state of FIG.

3 is a detailed view of portion A of FIG. 2;

4 is a perspective view showing a coupling example of a contact member and a shield case of the contact member used in the EMS eye shield according to the present invention, and

5 is an enlarged cross-sectional view of a state in which the contact member shown in FIG. 4 is coupled to a shield case.

<Description of Symbols for Main Parts of Drawings>

10; lower casing 20; shield case

22; bottom 23; side

30; top cover 35; conductor layer

40; motherboard assembly 44; hard disk drive

50; Subboard Assembly 55; Tuner

60, 60 '; Contact member 61, 61'; Fitting

62, 62 '; Elastic contact 63'; Body

EMI shielding apparatus according to the present invention for achieving the above object, the lower casing; A shield is fixedly installed on the lower casing so as to surround components such as a hard disk drive and a tuner as a storage medium embedded in the lower casing, and a shield having a bottom surface and a side surface extending at a predetermined height upward from four edges of the bottom surface, respectively. case; And an upper cover which is coupled to the lower casing and has an inner layer on the inner side thereof to form a predetermined shielding space in contact with the upper ends of the four sides of the shield case when the lower casing is coupled to the lower casing.

According to this, the EMI generated during the operation of the set-top box is absorbed and blocked by the shield layer and the conductor layer of the upper cover to form a predetermined shielding space, so that EMI is emitted to the outside or EMI generated from other peripheral devices penetrates inside. There is no work. Therefore, operation errors due to EMI can be prevented and the user can be safely protected.

According to a preferred embodiment of the present invention, a second conductor layer is formed on the inner surface of the lower casing, such as the conductor layer on the inner side of the upper cover.

The conductor layer and the second conductor layer are made of a Cu—Ni plating layer.

In addition, a plurality of metal contact members are installed at the upper ends of the four sides of the shield case to facilitate contact with the conductor layer.

The contact member includes a fitting portion fitted to an upper side of the shield case and an elastic contact portion extending from the fitting portion to elastically contact the conductor layer.

In addition, a plurality of vents may be formed on the side surfaces of the shield case.

Best Mode for Carrying Out the Invention Preferred embodiments of the present invention will now be described based on the accompanying drawings.

1 is an exploded perspective view of a set-top box having an image information storage medium to which the EMI shielding apparatus is applied according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the assembly state of FIG. 1, and FIG. to be.

In FIG. 1, reference numeral 10 is a lower casing, 20 is a shield case, 30 is an upper cover, 40 is a motherboard assembly, 50 is a subboard assembly, and 60 is a contact member.

As shown in Figures 1 to 3, the lower casing 10 is formed in a substantially box shape with an open top, and is integrally plastic injection molded. Ribs 11 including a honeycomb structure for strength reinforcement are formed on the inner surface of the lower casing 10 to be injection-molded as described above, and a plurality of high information for fixing the shield case 20 to be described later ( 12) is in place. In addition, a plurality of hooks 13 for coupling with the upper cover 30 are formed at a predetermined interval at an upper end of the inner side of the lower casing 10.

On the other hand, although not shown in detail, a predetermined second conductor layer (the second conductor layer is to be distinguished from the conductor layer of the upper cover described later) over the entire inner surface of the lower casing 10, for example, Cu- Ni plating layer can be formed.

The shield case 20 is fixedly installed on the lower casing 10 by a plurality of screws 21, and has four side surfaces extending upwards from the edge of the bottom surface 22 and the bottom surface 22 to a predetermined height. 23 is provided. The bottom surface 22 has several threaded holes 22a for fastening the screws 21 in place, and a plurality of ventilation holes 23a are formed at the side surface 23. In addition, the shield case 20 is formed with holes of various shapes and structures, and these holes are not related to the EMI shielding of the present invention, and thus detailed description thereof will be omitted.

The upper cover 30 is integrally plastic injection molded like the lower casing 10, and ribs 31 are formed on the inner surface of the upper cover 30, which also includes a honeycomb structure for strength reinforcement. In addition, a hook hole 33 corresponding to the hook 13 formed on the lower casing 10 is formed at an edge thereof. In addition, a conductive layer 35 is formed on the inner side to contact the side 23 of the shield case 20 to form a predetermined shielding space when the upper cover 30 is coupled to the lower casing 10. do. The conductor layer 35 is made of a Cu—Ni plating layer.

The motherboard assembly 40 includes a plurality of components 41 including electronic chips, and a hard disk drive 44 as a storage medium. In addition, the subboard assembly 50 is provided with a plurality of components 51 and a tuner 55.

2 and 3, the motherboard assembly 40 and the subboard assembly 50 are disposed in the shield case 20, whereby the board assembly 40, 50 is a shield case ( 20) and the conductor layer 35 of the upper cover 30, so that the EMI generated during the operation of the component parts including the electronic chip mounted on the boards 40 and 50 is external. It is not released to.

The contact member 60 is provided to be inserted into the upper portion of the four sides 23 of the shield case 20, which is, according to the conductive layer 35 of the shield case 20 and the upper cover 30 Since the contact can be kept good at the time of contact, more effective EMI shielding is possible.

The contact member 60 as described above is formed of a metal material, and has a fitting portion 61 and an elastic contact portion 62. As shown in FIG. 3, the fitting portion 61 is tightly fitted from the upper portion to the lower portion of the side 23, and the elastic contact portion 62 is formed to be inclined slightly upward from the fitting portion 61. As a result, when the contact with the conductor layer 35 is in contact with the elastic layer to improve the contact.

On the other hand, as another embodiment of the contact member that serves as described above, a contact member 60 ′ as shown in FIGS. 4 and 5 may be provided. According to the drawings, the contact member 60 'according to another embodiment has a length corresponding to the length of the side surface 23 of the shield case 20, and a plurality of fitting portions 61' in place of the body 63 'having a length. Is formed, and a plurality of elastic contact portions 62 'are formed at the upper end of the body 63'.

The fitting portion 61 ′ is positioned and formed to correspond to the plurality of fitting protrusions 23b formed at the upper end of the side surface 23, and the elastic contact portion 62 ′ is formed about three to four.

As shown in FIG. 5, the contact member 60 ′ according to another embodiment of the present invention has a fitting portion 23 ′ fitted to the fitting protrusion 23 b formed at the side surface 23 of the shield case 20. When the upper cover 30 is coupled in this state, the conductor layer 35 formed on the inner side of the cover 30 and the elastic contact portion 62 'of the contact member 60' are in contact with each other. Thus, a predetermined shielding space is formed therein. At this time, since the contact member 60 'makes good contact between the conductor layer 35 and the shield case 20, EMI can be more effectively shielded.

According to the present invention as described above, EMI generated during the operation of the set-top box is absorbed and blocked by the conductor layer of the shield case and the top cover to form a predetermined shielding space, so that EMI is emitted to the outside or generated in other peripheral devices EMI is not penetrated inside. Therefore, operation errors due to EMI can be prevented and the user can be safely protected.

That is, according to the present invention, it is possible to provide a set top box having an image information storage medium that satisfies the EMI emission standard set by each country and is very satisfactory in terms of user preference.

While the invention has been shown and described in connection with the preferred embodiments for illustrating the principles of the invention, the invention is not limited to the construction and operation as shown and described. Rather, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

Claims (7)

Lower casing; A shield is fixedly installed on the lower casing so as to surround components such as a hard disk drive and a tuner as a storage medium embedded in the lower casing, and a shield having a bottom surface and a side surface extending at a predetermined height upward from four edges of the bottom surface, respectively. case; And EMI shield comprising: an upper cover coupled to the lower casing, the inner side of the upper cover is formed with a conductor layer to form a predetermined shielding space in contact with the upper end of the side of the shield case when combined with the lower casing Device. The method of claim 1, EMI shielding device, characterized in that a second conductor layer, such as a conductor layer on the inner side of the upper cover is formed on the inner side of the lower casing. The method of claim 2, EMI shielding device, characterized in that the conductor layer and the second conductor layer is a Cu-Ni plating layer. The method according to any one of claims 1 to 3, EMI shielding device characterized in that at least one contact member of a metallic material is installed on the upper side of the shield case to facilitate contact with the conductor layer on the inner side of the upper cover. The method of claim 4, wherein The contact member is EMI shielding device characterized in that it is composed of a fitting portion fitted to the upper side of the shield case and an elastic contact portion extending from the fitting portion to elastically contact the conductor layer. The method of claim 4, wherein The contact member has a fitting portion into which a plurality of fitting protrusions formed on the side surface are inserted into a body having the same length as that of the shield case, and a plurality of elastic contact portions contacting the conductor layer of the upper cover at the upper end of the body. EMI shielding device characterized in that formed. The method according to claim 5 or 6, EMI shielding device, characterized in that a plurality of ventilation holes are formed on the side of the shield case.