JP2007073790A - Wiring member locking device and electronic device casing - Google Patents

Abstract

PROBLEM TO BE SOLVED To provide a semiconductor connected to a wiring member discharged from a statically charged human body or other article to a wiring member inside the electronic device through a heat radiating hole disposed in a casing of the electronic device such as a thin display device. Provided is a means for restricting the passage position of the wiring member for preventing occurrence of defective dielectric breakdown of components.
A side edge of a wiring member 24 such as FPC or FFC is locked by a clamper 6aa or 6ab integrally formed with a resin molding chassis 6 for mounting the printed wiring board, or the wiring member 24 is in proximity. In the vicinity of the exhaust hole on the inner surface of the cabinet, a thin plate-like partition is formed in the normal direction of the inner surface of the cabinet, and the space distance between the exhaust hole and the wiring member 24 is maintained.
[Selection] Figure 4

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin display device using a liquid crystal display panel or a PDP as a display element, and other devices for locking wiring members such as FPC and FFC in an electronic device, and an electronic device housing having a heat radiating hole. Means for maintaining a spatial distance between the wiring member and the heat radiating hole formed in the surface of the electronic device casing is provided.

Thin display devices such as TVs and data displays using liquid crystal display panels and PDP as display elements have many features such as a large flat screen, thin shape, light weight, and power saving compared to conventional display devices using cathode ray tubes. Demand is expanding rapidly. In particular, efforts are being made to realize further thinning in order to secure the features of a thin display device that can enjoy a large display screen even under installation environment conditions in which it is difficult to secure a sufficient installation location.

As a means of realizing further thinning of the thin display device, a large number of circuits between the printed wiring boards disposed in the thin display device and between the printed wiring board and the display panel are connected at a time. film-like FPC (F lexible P rinted C ircuit ) or FFC (F lexible F lat C able ) while applying a wiring member such as the disposed in the cabinet of the thin-type display device as a wiring member capable Electronic circuit components including wiring members and printed wiring boards and the space inside the cabinet are made as small as possible.

FIG. 1B shows a rear view of a liquid crystal television as a thin display device. As shown in FIG. 6 which is a longitudinal sectional view cut along a cutting line CC in FIG. 1B, a large number of heats are generated to dissipate heat generated in the thin display device into the atmosphere and efficiently cool the inside of the cabinet. The exhaust hole 3ab is formed in the upper part of the rear cabinet 3. When a human body or other electrostatically charged object 7 approaches or comes into contact with a position close to the outer surface of the exhaust hole 3ab formed in the rear cabinet 3, the exhaust hole 3ab on the upper part of the rear cabinet 3 of the thin display device A semiconductor that is discharged to a conductor of an electronic circuit component including a wiring member 24 (hereinafter simply referred to as a wiring member) such as an FPC or FFC in the thin display device that is located at a short distance via the semiconductor device and connected to the conductor May cause breakdown failure of parts.

While MOS type semiconductors in electronic circuits break down due to overvoltage of around 100 volts and cause defects, the electrostatic voltage charged on the human body during the dry season in winter may reach 10 kilovolts or more, In order to prevent a human body or other electrostatically charged material from being discharged to an electronic circuit component including a wiring member inside the housing through a drilled exhaust hole and causing an insulation failure of a semiconductor component in the electronic circuit. It is necessary to maintain a sufficient space distance between the wiring member in the cabinet where the passage position is unstable and the exhaust hole formed in the rear cabinet.

As a conventional example for regulating the passage position of the wiring member, as shown in Patent Document 1, a wiring insertion port and a wiring locking hole are provided on the end surface of the printed wiring board to lock the wiring member. Or, as seen in Patent Document 2, a wiring locking part is provided and locked on a part of a printed wiring board support, but both are intended to lock an insulation-coated electric wire, such as FPC and FFC. It was not a means for rationally restricting the passage position of the wiring member.
Japanese Patent Laid-Open No. 7-326873 Japanese Utility Model Publication No. 62-34483

  When a human body or other electrostatically charged material approaches or comes into contact with the outer surface of the heat dissipation hole disposed in the rear cabinet of the thin display device, the closest distance via the heat dissipation hole of the rear cabinet of the thin display device In some cases, the electric conductor of the electronic circuit component including the wiring member in the thin display device is discharged to the electric conductor, causing a problem of causing a breakdown failure of the semiconductor component connected to the electric conductor.

In particular, in a wiring member in which a conductor is formed on the surface of a plastic film such as FPC or FFC, it is necessary to maintain a bending radius of a certain level or more in the bent portion in order to prevent disconnection accident of the conductor due to excessive mechanical stress on the conductor. In addition, since the passage route draws a large arc by the spring action of the plastic film member constituting the wiring member, it is easy to come into contact with the inner surface of the rear cabinet, so that a reliable passage position regulating means for the wiring member is required. Also, in order to facilitate design or production convenience, for example, sharing of parts between different models and management at the production site, existing parts used in past models are often diverted. In this case, the short passage position restricting means for the wiring member cannot be used, and the longer one must be used, so that it is easy to contact the inner surface of the rear cabinet. Need.

At least one claw-like shape that is used to lock the side edges of wiring members such as FPC and FFC that connect printed wiring boards inside an electronic device or between printed wiring boards and other electronic circuit components. A wiring member locking clamper is formed integrally with a resin molded chassis for mounting a printed wiring board.

The position of passage of wiring members such as FPC and FFC that connect printed wiring boards inside the electronic device or between the printed wiring board and other electronic circuit components is regulated, and is drilled on the cabinet surface of the electronic device. In order to maintain a spatial distance from the heat radiating hole, a partition wall protruding in the normal direction of the cabinet inner surface is formed in the vicinity of the heat radiating hole of the cabinet inner surface close to the wiring member.

It is necessary to maintain a bending radius of a certain level or more at the bent portion of the wiring member in order to prevent disconnection accident of the conductive member due to excessive mechanical stress on the conductive member constituting the wiring member such as FPC or FFC In the wiring member such as FFC, it is possible to reliably regulate the passing position and maintain the space distance between the wiring member and the heat radiation hole formed in the housing surface of the electronic device. Even when a human body or other electrostatically charged material approaches or comes into contact with a position close to the outer surface of the heat dissipation hole, the electronic circuit in the electronic circuit is caused by electrostatic discharge from the human body or other electrostatically charged material to the electronic circuit component including the wiring member. It becomes possible to prevent the occurrence of defective breakdown of semiconductor components.

Hereinafter, a liquid crystal television as a thin display device to which an embodiment of the present invention is applied will be described with reference to the drawings. FIG. 1A is an external front view of the liquid crystal television 1, and FIG. 1B is a rear view of the liquid crystal television 1. In FIG. 1, 2 is a liquid crystal display panel 3 for displaying an image, a rear cabinet, 3aa is an outside air intake hole for radiating and cooling the heat generated in the liquid crystal television outside the housing, 3ab is an exhaust hole, and 4 is a liquid crystal. A stand 5 applied when the television 1 is used as a desktop type is a front cabinet.

Next, a schematic configuration of the optical system inside the liquid crystal television will be described with reference to FIG. On the back side of the liquid crystal display panel 2, on the surface using advanced light control technology such as light reflection, polarization, refraction, and light diffusion to improve image quality such as high brightness and uniform surface brightness of the liquid crystal display screen An optical sheet set 11 composed of a plurality of films to which means such as forming a large number of microlens arrays is applied is provided. Further, a back light unit 19 for irradiating light from the back side of the optical sheet set 11 and the liquid crystal display panel 2 is disposed behind the optical sheet set 11. The backlight unit 19 includes a large number of arc tubes 14 and a light diffusing plate 12 disposed in a backlight chassis 13.

FIG. 3 is a perspective view showing the arrangement relationship of the main components inside the LCD TV according to the embodiment of the present invention with the rear cabinet removed. A backlight chassis 13 constituting a backlight unit for irradiating light from the back surface of the liquid crystal display panel 2 is disposed on the back surface of the liquid crystal display panel 2. Further, a plurality of printed wiring boards such as a signal processing board 22 and a liquid crystal display panel controller board 23 constituting an electric circuit of the liquid crystal television are attached to the back surface of the backlight chassis 13. The liquid crystal display panel controller substrate 23 and the liquid crystal display panel 2 are connected via a connector 25 by a wiring member 24 such as FPC or FFC.

FIG. 4 is an enlarged perspective view showing in detail a portion of a wiring member 24 such as FPC or FFC for connecting the liquid crystal display panel 2 and the liquid crystal display panel controller board 23 for explaining the first embodiment of the present invention. A wiring member 24 such as an FPC or FFC connects between the connector 25 mounted on the liquid crystal display panel controller board 23 side and the connector 25 mounted on the liquid crystal display panel 2 side. In the wiring member 24, a large number of conductors are formed on a plastic film surface by a printing technique, and the conductor surface is further covered with a plastic thin film insulator. The thickness of the plastic insulator is thin and the withstand voltage is set to about 500 volts in order to reduce the thickness and flexibility of the wiring member. However, the liquid crystal television according to the present invention can be used without any problem under normal use conditions. Is possible.

FIG. 5 shows a modification of the first embodiment of the present invention, in which the first and second clampers of the resin-molded chassis 6 are formed to be inclined, and the first clamper 6aa ′ and The second clamper 6ab ′ is formed to be inclined. The other configuration is the same as that of FIG. By forming it in such an inclined manner, it becomes possible to more appropriately position and hold the wiring member 24 portion such as FPC or FFC. That is, the first clamper 6aa 'and the second clamper 6ab' formed at an inclination can restrict the displacement of the wiring member 24 such as FPC or FFC toward the rear cabinet 3 side.

However, if an electrostatically charged object such as a human body that reaches 10 kilovolts or more from the outside of the cabinet through the opening such as a heat radiating hole of the liquid crystal television cabinet from the outside of the cabinet comes into contact or close to the wiring member 24 in the winter season, the wiring member 24 The insulation of the plastic thin film insulator of the member 24 is broken and discharged to the conductor constituting the wiring member. The discharge voltage is also applied to an integrated circuit component such as a MOS type semiconductor or a transistor connected to the conductor through the conductor of the wiring member 24, and causes a breakdown failure of these semiconductors.

As shown in the conventional example of FIG. 7, the passage path of the wiring member 24 is a large circular arc between two points of the plurality of connectors 25 to which the wiring member 24 is connected by the spring action of the plastic constituent member constituting the wiring member 24. Is drawn and approaches or contacts the exhaust hole 3ab formed in the upper part of the rear cabinet 3. In order to avoid such a state, as shown in FIG. 4, the first clamper 6aa and / or the second clamper 6ab are integrally molded together with the resin molded chassis 6 for supporting the printed wiring board, and at least the side edge of the wiring member 24 is formed. A space between the wiring member 24 and the exhaust hole drilled in the cabinet is secured by sandwiching one of the parts and restricting the passage route of the wiring member 24, and through the heat radiating hole drilled in the cabinet It is possible to prevent the electrostatically charged material that is close to or in contact with the outer surface of the cabinet from being discharged to the wiring member 24.

  FIG. 6 is a perspective view showing a longitudinal section taken along a cutting line CC shown in FIG. 1 for explaining a second embodiment of the present invention. A plurality of thin partition walls 3c are integrally formed with the rear cabinet 3 in the normal direction of the inner surface of the partition portion 3d of the plurality of exhaust holes 3ab drilled in the upper portion of the rear cabinet 3.

The wiring member 24 such as FPC and FFC and the exhaust hole 3ab formed in the upper part of the rear cabinet 3 are separated from each other by the partition wall 3c, and the electrostatically charged material and the rear cabinet approach or contact the outer surface of the exhaust hole 3ab. 3 It is possible to maintain a spatial distance from the internal wiring member 24, and the static electricity of 10 kilovolts or more is prevented from being discharged to the wiring member 24 and connected to the wiring member 24. It becomes possible to prevent the occurrence of defective breakdown of semiconductor components. Further, it is possible to prevent the wiring member 24 from closing the exhaust hole 3ab and reducing the heat radiation effect of the heat generated inside the cabinet.

1A is a front view and FIG. 1B is a rear view of a liquid crystal television according to the present invention. It is a perspective view which shows schematic structure of the optical system inside the liquid crystal television concerning this invention. It is the back perspective view inside this liquid crystal television which removed the rear cabinet of the liquid crystal television concerning the present invention. It is an expansion perspective view which shows the wiring member part for demonstrating the 1st Example of this invention in detail. It is an expansion perspective view which shows the wiring member part for demonstrating the modification of the clamper of 1st Example of this invention in detail. In order to show the 2nd Embodiment of this invention, it is a perspective view which shows the longitudinal cross-section cut | disconnected along the cutting line CC shown with a dashed line in FIG.1 (b). It is a longitudinal cross-sectional view of the prior art example cut | disconnected along the cutting | disconnection line CC shown with a dashed line in FIG.1 (b), and shows the positional relationship with the wiring member and exhaust hole in a liquid crystal television.

Explanation of symbols

1: LCD TV 2: Liquid Crystal Display Panel 3: Rear Cabinet 3a: Heat Dissipation Hole 3aa: Intake Hole 3ab: Exhaust Hole 3b: Projection 3c: Partition 3d: Partition Part 4: Stand 5: Front Cabinet 6: Resin Molded Chassis 6a: Clamper 6aa, 6aa ′: first clamper 6ab, 6ab ′: second clamper 7: electrostatically charged object 11: optical sheet set 12: light diffusion plate 13: backlight chassis 14: arc tube 19: backlight unit 22: signal Processing board 23: Liquid crystal display panel controller board 24: Wiring member 25: Connector

Claims (2)

In a wiring member locking device for locking a wiring member such as FPC or FFC connected to a printed wiring board in an electronic device, a clamper formed so as to sandwich at least one of the side edges of the wiring member A wiring member locking device characterized by being integrally formed with a resin-molded chassis for mounting a substrate. In an electronic device housing having a heat dissipation hole on a housing surface of an electronic device having a wiring member such as FPC or FFC connected to a printed wiring board, in the vicinity of the heat dissipation hole on the inner surface of the housing close to the wiring member An electronic device casing characterized in that a partition wall protruding in the normal direction of the inner surface of the casing is formed.

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