JPH0644279U - Lighting equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention provides a trigger provided in a fluorescent tube in order to solve the problems that the fluorescent tube has a low starting characteristic and a low light output at a low temperature. The objective is to obtain a reliable and inexpensive lighting device by effectively utilizing the coat. According to the present invention, there is provided a fluorescent tube having a trigger coat on the outer surface of the tube, a reflecting member disposed on the back surface of the fluorescent tube and having a concave shape for accommodating the fluorescent tube, and an illumination wiring board. And is provided with a notch in the reflecting member,
A connecting member having an end connected to the trigger coat of the fluorescent tube housed in the reflecting member through the notch, and the other end of the connecting member is wired to the illumination wiring board. An illumination device configured to be connected to a fluorescent tube drive circuit that is present.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of an illuminating device which is disposed on the back surface of a flat display device such as a liquid crystal display device and irradiates light toward the viewing direction which is the front side of the display device. The present invention relates to a connecting means for connecting the trigger coat and the fluorescent tube driving circuit by using the fluorescent tube having the above.

[0002]

[Prior art]

 In a display device using a flat display panel such as a liquid crystal display device, an illuminating device is provided on the back side of the liquid crystal panel in which image information is written, and the light from the illuminating device positions it in front of the liquid crystal panel. By irradiating the viewer with image information, an image with clear contrast was displayed.

As an illuminating device for such a liquid crystal display device, there has been conventionally proposed Japanese Utility Model Laid-Open No. 2-35582. As a conventional example, a description will be given with reference to the drawing proposed in Japanese Utility Model Laid-Open No. 2-35582. FIG. 3 is a top perspective view of the lighting device viewed from the direction in which a flat display panel (not shown) is arranged, and FIG. 4 shows a bottom perspective view of the lighting device of FIG. 3 as seen from the bottom side.

A conventional example will be described in detail below with reference to the drawings. As shown in FIG. 3, the fluorescent tube 20 supports the bent portion of the fluorescent tube 20 in the vertical direction by inserting a U-shaped bent portion into the opening 13 of the reflecting member 10. Both ends 21 of the fluorescent tube 20 are held so as to be sandwiched by the reflecting member 10 via the fluorescent tube holding portion 15 and the illumination wiring board 30 inserted in the illumination wiring board positioning portion 14.

The reflection member 10 is formed of a high temperature resistant resin such as white polypropylene having high reflection efficiency and has a reflection surface portion 17 having a quadric surface such as a parabola or a hyperbola or a pseudo quadric surface. There is.

Further, as shown in FIG. 4, the lighting wiring board 30 is positioned and held by the board positioning portion 14 of the reflection member 10, and the fluorescent tube terminals 23 are connected to the lighting wiring board 30 by soldering. The lead wire of the thermal fuse 33 makes contact with the end portion 22 of the fluorescent tube through the notch provided in the fluorescent tube holding portion 15, and is connected and fixed by being soldered to the illumination wiring board 30. The illumination wiring board 30 and the illumination drive circuit (not shown) are connected to each other by an external circuit connecting portion 32 whose ends are soldered to the illumination wiring board 30.

A brief description of the assembly procedure will be given. In FIG. 3, the reflecting surface portion 17 of the reflecting member 10 is placed upward, the bent portion of the fluorescent tube 20 is passed through the opening 13, and both ends 22 of the fluorescent tube 20 are housed in the fluorescent tube holding portion 15. . The illumination wiring board 30 to which the external circuit connecting portion 32 has been soldered in advance is inserted from the direction of arrow A between the board positioning portion 14 and the fluorescent tube holding portion 15 of the reflecting member 10 as shown in FIG. At this point, the fluorescent tube 20 has a bent portion inserted in the opening 13 for vertical positioning, and both ends 22 of the fluorescent tube 20 are positioned via the fluorescent tube holder 15 and the illumination wiring board 30. It is sandwiched between the parts 14 and positioned.

Next, as shown in FIG. 4, the illuminating device is turned over and the fluorescent tube terminals 23 are soldered to the illuminating wiring board 30 without any slack. As a result, both end portions 22 of the fluorescent tube 20 of the fluorescent tube 20 hit the flange portions of the fluorescent tube holding portion 15 and are positioned. Then, the lead wire of the thermal fuse 33 is passed through the notch provided in the fluorescent tube holding portion 15 to make contact with the fluorescent tube 20 and then soldered to the illumination wiring board 30 to complete the assembly.

The fluorescent tube used under such a structure emits light by applying a high voltage between the terminals of the fluorescent tube to start glow discharge and then arc discharge. Therefore, in a U-shaped fluorescent tube or an S-shaped fluorescent tube having a tube shape in which the distance between the terminals of the fluorescent tube is long, the fluorescent tube applied voltage must be higher and at low temperatures. The fluorescent tube had a problem that the starting characteristics of starting arc discharge from glow discharge deteriorated.

As means for solving these problems, Japanese Patent Application Laid-Open No. 4-264426 and Japanese Utility Model Application Laid-Open No. 2-107124 have been proposed. In both cases, an electrode plate is provided on the back surface of the fluorescent tube in order to improve the starting characteristics of the fluorescent tube. Then, even if the fluorescent tube becomes long, it is intended to prevent the starting characteristic of the fluorescent tube from being deteriorated.

However, in Japanese Patent Laid-Open No. 2-107124, a reflector is provided as a metal conductive material on the back surface of the fluorescent tube so as to have both a reflection function and a function of keeping the potential constant over the entire length of the fluorescent tube. However, in reality, it is an expensive product compared to the reflector produced by plastic molding.In addition, the reflector and the substrate are in close contact with each other, and a part of the reflector is soldered to the substrate. Therefore, if components are mounted on the substrate and double-sided wiring is used, there is a risk of short-circuiting between the conductive reflector and the lead portion of the component, and the insulating film defect of the wiring.

Further, in Japanese Patent Laid-Open No. 4-264426, the central portion of the fluorescent tube is set to the ground potential to provide a temporary trigger function to improve the starting characteristic of the fluorescent tube at low temperature. Since the ground potential is used only as the ground potential, the effect decreases as the length of the fluorescent tube becomes longer, and a metal plate for clipping the fluorescent tube is necessary to supply the ground potential to the fluorescent tube. This requires a lot of time and effort to solder the lighting circuit board mounted on the back surface of the reflection plate, which requires a large number of assembly steps.

[0013]

[Problems to be solved by the device]

 In view of this point and the recent progress in fluorescent tube manufacturing technology, the present invention uses a fluorescent tube with a trigger coat that is applied and arranged at the time of manufacturing the fluorescent tube, and reflects the light emitted by the fluorescent tube. An inexpensive lighting device that improves the fluorescent tube start-up characteristics at low temperatures with a minimal number of parts and assembly man-hours in the lighting device that is housed in the recess provided in the reflecting member and supported by the lighting wiring board and the reflecting member. With the goal.

[0014]

[Means for Solving the Problems]

 The gist of the present invention for achieving the above object is to provide a fluorescent tube having a trigger coat on the outer surface of the tube and a concave shape for housing the fluorescent tube, which is arranged on the back surface of the fluorescent tube. A lighting device including a reflecting member having a reflecting surface for reflecting the light emitted by the fluorescent tube housed in the concave portion, and an illumination wiring board for wiring the terminals of the fluorescent tube. And a connecting member having a notch formed in the reflecting member, the connecting member having an end portion connected to the trigger coat of the fluorescent tube housed in the reflecting member through the notch. An illumination device having a configuration in which the other end of is connected to a fluorescent tube drive circuit wired on the illumination wiring board.

[0015]

[Action]

 The starting characteristics of the fluorescent tube at low temperature when the ambient temperature of the lighting device is low are as described in Fukuihei 2-107124. Without the trigger coat, the starting characteristics of the fluorescent tube at low temperature are bad and sufficient. There is a problem that a large luminous flux cannot be obtained. In the lighting device of the present invention, the trigger coat disposed on the fluorescent tube and the reflecting member are connected by a connecting member, and the connecting member, the illumination wiring board, and the reflecting member are connected by the screwed portion of the connecting member. Since the and are integrally fixed to the housing, the trigger coat disposed on the fluorescent tube can be effectively used, and the voltage of the high-voltage potential part of the fluorescent tube can be effectively distributed over the entire length of the fluorescent tube. It is possible to improve the starting characteristics of the fluorescent tube at low temperatures.

[0016]

【Example】

 FIG. 1 is a bottom perspective view of an embodiment of a lighting device according to the present invention, and FIG. 2 is a sectional view taken along line AA in FIG. As shown in FIG. 1, the fluorescent tube 20 is arranged on the reflecting member 10 so that the trigger coat 21 arranged on the fluorescent tube 20 is in contact with the reflecting member 10. Further, by inserting one U-shaped bent portion of the fluorescent tube 20 into the opening 13 provided in the reflecting member 20, the U-shaped bent portion of the fluorescent tube is supported in the vertical direction in the drawing, and the other fluorescent portion is supported. The fluorescent tube ends 22 which are both ends of the tube 20 are held so as to be sandwiched by the reflecting member 10 via the fluorescent tube holding portion 15 on the reflecting member 10 and the illumination wiring board 30 inserted in the board positioning portion 14. ing. In order to reflect the light flux of the stored fluorescent tube forward, the shape of the fluorescent tube housing portion of the reflecting member 10 is a parabolic, hyperbolic or other quadric surface or a pseudo quadric surface-like reflecting surface.

The lighting wiring board 30 is positioned and held by the board positioning portion 14 of the reflecting member 10, and the fluorescent tube terminals 23 are connected to the lighting wiring board 30 by soldering. Further, the lead wire of the thermal fuse 33 is in contact with the end of the fluorescent tube 20 through the notch provided in the fluorescent tube holding portion 15, and is fixed to the illumination wiring board 30 by soldering. Also, an illumination drive circuit (not shown) that generates a high-voltage drive signal for driving the illumination wiring board 30 and the fluorescent tube 20 is connected by an external circuit connection section 32.

Further, a cutout portion 11 is provided in a portion of the reflection member 10 that houses the fluorescent tube 20, and the fluorescent tube 20 is provided at the position of the cutout portion 11 as shown in FIG. The trigger coat 21 is located. A conductive connecting member 40 is arranged as shown in FIG. 1 in order to set the trigger coat 21 to the ground potential of the illumination drive circuit, and the wiring pattern 31 and the trigger connector 31 which are wired to the illumination wiring board 30 by the connecting member 40. The card 21 is connected.

A contact spring end 42 for connecting to the trigger coat 21 through the notch 11 is formed at one end of the connecting member 40, and the other end of the connecting member 40 is brought into contact with the wiring pattern 31. A screwing portion 41 for fixing is formed, and a positioning notch portion 43 for semi-fixing the connecting member 40 to the reflecting member 10 is provided between both ends of the connecting member 40. By aligning the positioning notch 43 of the connecting member 40 with the positioning hook that is the positioning portion 12, the spring function of the contact spring end portion 42 of the connecting member 40 is improved.

Further, since the contact spring end portion 42 of the connecting member 40 comes into pressure contact with the trigger coat 21, the fluorescent tube 20 is pressed against the illumination wiring board 30 side, and at the same time, the fluorescent tube 20 shown in FIG. The connecting member 40 also has the function of the tube portion pressing against the flat surface portion of the reflecting member.

Further, as shown in FIG. 1, a second notch is provided in the vicinity of the contact spring end 42 of the connecting member 40, and the hook is provided at the position of the reflecting member 10 where the second notch and the reflecting member 10 come into contact with each other. The spring function of the contact spring end portion 42 can be improved by providing the shaped protrusion and forming the second positioning portion.

With such a configuration, the illumination drive signal formed by the illumination drive circuit passes through the external circuit connection portion 31 and is supplied to the illumination wiring board 30. The signal supplied to the lighting wiring board is the high voltage side of the fluorescent tube terminal 23 and the ground potential side (the high voltage side and the ground potential side are not accurate because the fluorescent tube is driven by alternating current, but it is used as an explanatory term). ) And drive the fluorescent tube. The ground potential side is connected to the screwing portion 41 of the connecting member 40 via the wiring pattern 31 to bring the connecting member 40 to the ground potential. The connecting member is connected to the trigger coat 21 of the fluorescent tube 20 via the contact spring end 42, and the trigger coat is set to the ground potential. The mercury vapor pressure inside the fluorescent tube becomes low at low ambient temperature, causing a decrease in light output. The fluorescent tube is activated at a low temperature by applying a ground potential to the trigger coat. It is possible to improve the startup characteristics of the.

[0023]

[Effect of device]

 The present invention is an easy means for connecting the trigger coat of a fluorescent tube with a trigger coat that is applied and disposed during manufacturing of the fluorescent tube and the connecting member through the notch provided in the reflecting member. Since it can be applied, the problem that the mercury vapor pressure inside the fluorescent tube becomes low and the light output decreases at low ambient temperature is improved. Further, since the connecting member and the trigger coat disposed on the fluorescent tube are in pressure contact with each other, reliability against vibration and shock is improved. Thus, the present invention solves the drawbacks of the prior art and provides a reliable and inexpensive lighting device.

[Brief description of drawings]

FIG. 1 is a bottom perspective view showing an embodiment of a lighting device according to the present invention.

2 is an embodiment of the present invention, A- in FIG.
FIG.

FIG. 3 is a top perspective view of a conventionally proposed illumination device as seen from the flat panel side.

FIG. 4 is a bottom perspective view of the conventionally proposed illumination device of FIG. 3 seen from the bottom side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Reflective member 11 Notch part 12 Positioning part 20 Fluorescent tube 21 Trigger coat 30 Lighting wiring board 31 Wiring pattern 40 Connection member 41 Screw fastening part 42 Contact spring end part 43 Positioning notch part

Claims (1)

[Scope of utility model registration request] 1. A fluorescent tube in which a trigger coat is laid on the outer surface of the tube, and a concave shape for accommodating the fluorescent tube, which is arranged on the back surface of the fluorescent tube and is accommodated in the concave portion. In a lighting device configured by a reflecting member having a reflecting surface for reflecting the light emitted by the fluorescent tube, and an illumination wiring board for wiring the terminals of the fluorescent tube,
The reflecting member is provided with a notch, and a connecting member having an end portion connected to the trigger coat of the fluorescent tube housed in the reflecting member through the notch, and the other end of the connecting member is provided. A lighting device characterized by being connected to a fluorescent tube driving circuit wired on the lighting wiring board.