The present invention relates to a liquid crystal module of a direct below installed light type that is incorporated in a liquid crystal television or a personal computer, and more particularly to a liquid crystal module that can reduce the influence of heat generation from an end part having a pin terminal of a cold cathode tube by improving a fixing structure of a lamp frame for a lamp socket.
As the liquid crystal module of the direct below installed light type that is incorporated in a large liquid crystal television, a liquid crystal module is known in which a plurality of sets of straight cold cathode tubes, the one set of which includes the two cold cathode tubes, are arranged in a rear frame, lamp sockets are provided in both sides of the two cold cathode tubes of each set, and pin terminals at one ends of the cold cathode tubes of each set are connected together by a connecting plate to obtain a U shaped cold cathode tube. In such a liquid crystal module, as shown in
On the other hand, as a related art concerning the attachment of the lamp socket of the liquid crystal module, for instance, a technique is known in which a lamp socket is soldered and fixed to a balance PCB in a supporter corresponding to the above-described lamp frame (Patent Document 1). As another related art, a technique is known in which a lamp socket is detachably connected to a connector on the face of a base board in a sub-frame corresponding to the above-described lamp frame (Patent Document 2).
However, as in the related liquid crystal module shown in
On the other hand, since the techniques for fixing the lamp socket disclosed in the Patent Documents 1 and 1 are essentially different from the technique for fixing the lamp socket of the related liquid crystal module shown in
It is therefore one advantageous aspect of the present invention to provide a liquid crystal module that can reduce an influence of heat generation from an end part of a cold cathode tube having a pin terminal to lower a cost and prevents the end part of the cold cathode tube from being put out from a lamp socket.
According to one aspect of the invention, there is provided a liquid crystal module, including:
a lamp socket having a holding part holding a cold cathode tube which is inserted into the holding part through a silt formed on a part of a face of the lamp socket;
a lamp frame fixing the lamp socket to a rear frame so as to cover the lamp socket;
a supporting part formed on a face of the lamp frame and contacting the face of the lamp socket;
wherein a part of the face of the lamp frame opposing the part of the face of the lamp socket where the slit is formed is cut out.
The liquid crystal module may further comprise a rib formed on the face of the lamp frame and opposing a side face of the lamp socket and a position where the slit is formed, so as to suppress an expansion of the slit.
The liquid crystal module may be configured such that the rib has a tapered shape.
Exemplified embodiments of the invention are described below in detail with reference to the accompanying drawings.
A liquid crystal module of an exemplary embodiment shown in
The rear frame 1 is a shallow box shaped frame made of a plate and the light reflecting sheet 2 bent in an inverted trapezoid form is provided therein. On the light reflecting sheet 2, the straight cold cathode tubes 3 with one sets respectively composed of two cold cathode tubes are arranged in parallel. To both the sides of the cold cathode tubes 3 of each set, the lamp sockets 4 and 40 are attached. The intermediate parts of the cold cathode tubes 3 are held by the lamp holders 6 and fixed to a bottom plate 1a of the rear frame 1. Further, both the end parts of the cold cathode tubes 3 to which the lamp sockets 4 and 40 are attached are covered with the lamp frames 5 and 5 made of a synthetic resin which are provided inside side plates 1b and 1b at the right and left of the rear frame 1 so as not to generate unevenness in brightness caused from the lamp sockets.
The cold cathode tubes 3, the lamp sockets 4 and 40 and the lamp frame 5 will be described below in detail.
As shown in
On the lamp frames 5 and 5 and the cell guides 8 and 8, four peripheral edges of the liquid crystal panel 9 are mounted. As shown in
The four peripheral edges of the liquid crystal panel 9 and the four side plates 1b and 1b, and 1c and 1c of the rear frame 1 are surrounded and covered with four long and short vessels 10a, 10a, 10b and 10b assembled in a rectangular frame form. The vessels are fixed to the double side plates 1c and 1c by screws.
Both the lamp sockets 4 and 40 are formed with heat resisting rubber. As shown in
As shown in
The slit part 4b of the lamp socket 4 is formed to have a width narrower than that of the hollow holding part 4a as shown in
As shown in
The lamp frames 5 and 5 that cover the lamp sockets 4 and 40 include, as shown in
The rear plate part 5c of the lamp frame 5 is formed in an irregular plate shape that a recessed part recessed inward the rear frame 1 and a protruding part protruding outward the rear frame 1 are alternately connected. As shown in
As described above, when the upper face of the lamp socket 4 is pressed and fixed by the socket pressing part 5d having the recessed cut out parts 5e formed, even if both the end parts of the lamp socket 4 provided with the hollow holding parts 4a and the slit parts 4b are heated to a high temperature by heat generated from the end parts of the cold cathode tubes 3 and 3, a thermal conduction to the socket pressing part 5d of the lamp frame 5 is prevented by the recessed cut out parts 5e and 5e. Thus, the rise of the temperature is suppressed in the parts of the socket pressing part 5d where the recessed cut out parts are formed, so that the temperature is not so much high. Accordingly, the lamp frame 5 made of the synthetic resin may be used that is inexpensive and low in its heat resisting temperature. Further, since the current value of the cold cathode tube 3 is increased so that the number of the cold cathode tubes 3 may be reduced, a cost can be reduced.
Then, when the expansion suppressing ribs 5f and 5f are formed near the side faces at both the end parts of the socket 4 where the slit parts 4b of the lamp socket 4 are provided, even if the impact force is exerted on the liquid crystal module so that the end parts of the cold cathode tubes 3 and 3 are apt to be put out from the hollow holding parts 4a and 4a of the lamp socket 4, the expansion of the slit parts 4b and 4b of the lamp socket 4 is suppressed by the expansion suppressing ribs 5f and 5f. Thus, the end parts of the cold cathode tubes 3 and 3 are assuredly prevented from being put out from the hollow holding parts 4a and 4a of the lamp socket 4.
The expansion suppressing ribs 5f and 5f have tapered shape. Hence, interference between the expansion suppressing ribs 5f and 5f and the lamp socket 4 when the lamp frame 5 is attached to the rear frame 1 as pressing the lamp socket 4 can be suppressed. Thus, an attaching operation of the lamp frame 5 can be performed more easily.
Since the other lamp socket 40 is also pressed and fixed by the socket pressing part 5d of the lamp frame 5 having the recessed cut out parts 5e and 5e formed, even if both the end parts of the lamp socket 40 are heated by heat generated from the end parts of the cold cathode tubes 3 and 3, the rise of the temperature is suppressed in the parts of the socket pressing part 5d where the recessed cut out parts are formed. Further, the impact force is applied to the liquid crystal module, the expansion of the slit parts 40b and 40b of the lamp socket 40 is suppressed by the expansion suppressing ribs 5f and 5f. Accordingly, the same operational effects as those described above are obtained.
Although only some exemplary embodiments of the invention have been described in detail above, those skilled in the art will readily appreciated that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of the invention. Accordingly, all such modifications are intended to be included within the scope of the invention.
The disclosure of Japanese Patent Application No. 2009-146755 filed Jun. 19, 2009 including specification, drawings and claims is incorporated herein by reference in it is entirety.
Number | Date | Country | Kind |
---|---|---|---|
P2009-146755 | Jun 2009 | JP | national |
Number | Name | Date | Kind |
---|---|---|---|
7057678 | Ishida et al. | Jun 2006 | B2 |
7165862 | Wu | Jan 2007 | B2 |
7452102 | Ryu | Nov 2008 | B2 |
7625112 | Ko et al. | Dec 2009 | B2 |
7714955 | Tsubokura et al. | May 2010 | B2 |
7722242 | Chen et al. | May 2010 | B2 |
7837377 | Lee et al. | Nov 2010 | B2 |
7959318 | Cho et al. | Jun 2011 | B2 |
20040008512 | Kim | Jan 2004 | A1 |
20050057946 | Kim | Mar 2005 | A1 |
20050068835 | Matsuo | Mar 2005 | A1 |
20050276074 | Ryu | Dec 2005 | A1 |
20070030663 | Ryu | Feb 2007 | A1 |
20080055916 | Chen et al. | Mar 2008 | A1 |
20080079865 | Kang et al. | Apr 2008 | A1 |
20080139008 | Lee et al. | Jun 2008 | A1 |
20080225198 | Azuma et al. | Sep 2008 | A1 |
20090154140 | Aoki et al. | Jun 2009 | A1 |
Number | Date | Country |
---|---|---|
2007-080627 | Mar 2007 | JP |
2008-146050 | Jun 2008 | JP |
Number | Date | Country | |
---|---|---|---|
20100321925 A1 | Dec 2010 | US |