JPH03114093A - Illuminating device - Google Patents

Abstract

PURPOSE:To simplify the wiring and to prevent the disconnection of a lead wire and the damage of electric parts by connecting the lead wire of a lamp to a wiring board being a junction terminal, and fixing the wiring board to a casing and forming them integrally. CONSTITUTION:A lamp 2 is contained in a casing provided with a light transmission plate 30, and light radiated from the lamp 2 is radiated to the outside through the light transmission plate 30. In this case, a lead wire 7 of the lamp 2 is connected to a wiring board 40, and the wiring board 40 is fixed to the casing. Accordingly, the wiring board 40 becomes near the lamp 2, and a lead wire becomes short. In such a way, the wiring structure is simplified, and even in the case impact or vibration is generated in an apparatus, it does not occur that the lead wire is pulled, and the wiring discontinuity and the damage to the lamp are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention (Industrial Application Field) The present invention relates to a lighting device that uses a lamp such as a fluorescent lamp as a light source and is suitable for use as a backlight for a liquid crystal television or a liquid crystal meter.

(Conventional technology) LCD televisions, LCD meters, etc. are designed to illuminate the LCD surface by shining light from the back of the transmissive LCD panel.
Such a backlight requires a lighting device that can illuminate a liquid crystal surface having a predetermined extent with uniform brightness as a whole.

Conventionally, this type of backlight has a shallow dish-shaped casing that houses a hot cathode or cold cathode fluorescent lamp as a light source, and the light emitted from this lamp is reflected by a reflective surface formed on the casing. An illumination device is used that illuminates the back surface of a liquid crystal panel through a light diffusing and transmitting plate installed in an opening of the liquid crystal panel.

When a hot cathode or cold cathode fluorescent lamp is used as a light source, these fluorescent lamps have superior luminous efficiency and generate less heat than incandescent bulbs, have a long life, and have a long discharge path, so their light emitting area is large. , it has the advantage that the light distribution tends to be uniform. In particular, in the case of fluorescent lamps, it is easy to configure the discharge path into a bent shape, such as a U-shape or a W-shape. Therefore, it is advantageous to illuminate a display surface having a predetermined spread with uniform brightness.

By the way, when low-pressure mercury vapor discharge lamps such as the above-mentioned fluorescent lamps are started in a low-temperature atmosphere, the starting voltage increases because the vapor pressure of mercury is low, and the rise time becomes longer. Even during stable lighting, if the ambient temperature is low, the vapor pressure of the enclosed luminescent metal or luminescent gas will be low, causing problems such as a decrease in luminous efficiency.

Therefore, when the liquid crystal display device is used in a low-temperature atmosphere, the start-up characteristics and luminous efficiency of the fluorescent lamp as a light source may deteriorate.

To prevent such problems, a heater may be installed inside the casing to heat the lamp.

Additionally, when a heater is installed, a thermistor or temperature fuse is required to control the output of the heater.

Therefore, the lighting device used as the backlight includes a plurality of electrical components, and the lead wires of these electrical components must be routed and wired.

Conventionally, the lead wires of each of the electrical components described above are connected to a wiring board serving as a relay terminal, and wires are routed from this wiring board to each required location.

(Problem to be Solved by the Invention) However, in the conventional case, the wiring board as the relay terminal is attached to the appliance main body side away from the casing, so the lead wires of each of the electrical components are drawn out far. As a result, not only did the large number of wires become complicated, but it was also confusing because it was difficult to tell which lead wire belonged to which electrical component.

Further, when shock or vibration occurs in the main body of the device, each electrical component is pulled through the lead wire, and there is a risk of not only breaking the wire but also causing damage to the electrical component.

The present invention aims to provide a lighting device in which wiring is simplified and breakage of lead wires and damage to electrical components are prevented.

[Structure of the Invention] (Means for Solving the Problems) The present invention is characterized in that the lead wire of a lamp is connected to a wiring board as a relay terminal, and the wiring board is fixed and integrated with a casing. shall be.

(Function) According to the present invention, since the wiring board as a relay terminal is fixed and integrated with the casing, the wiring board is closer to the lamp, the lead wires can be shortened, and the wiring structure is simplified. Even if the main body is subjected to shock or vibration, the lead wire will not be pulled, preventing wire breakage and lamp damage.

(Example) The present invention will be described below based on an example shown in the drawings.

In the figure, reference numeral 1 denotes a shallow dish-shaped casing with an open top, which is made of a metal plate such as aluminum, and has an open top.

This housing 1 accommodates a bent fluorescent lamp 2.2. The fluorescent lamps 2.2 of this embodiment are W-shaped high frequency lighting type cold cathode fluorescent lamps, and are arranged side by side in a plane. Each cold cathode fluorescent lamp 2 includes a bulb 3 bent into a W-shape, which includes straight portions 4a, 4b, 4c, 4d substantially parallel to each other and U-shaped bent portions 5a, 5b, 5c. have. Cold cathode type electrodes 6a, 6b are sealed to both ends of the bulb 3, and these electrodes 6a, 6b are connected to both ends of the bulb 3.
Lead wires 7a and 7b connected to 6b are led out.

A phosphor coating (not shown) is formed on the inner surface of the bulb 3, and a predetermined amount of mercury and a starting rare gas such as argon or xenon are sealed inside the bulb 3.

The fluorescent lamps 2 having such a configuration each have a lamp holder 10a made of an elastic block such as silicone rubber.
It is held at s 10 b s 10 c and 10d.

The above lamp holder 10 a s 10 b s 10
Two lamp holders 10a110 among c and 10d
b are arranged at both ends of one side of the casing 1 to support the ends of the respective fluorescent lamps 2.2, and the other lamp holder 10c is arranged at the center part of one side of the casing 1. The fluorescent lamps 2.2 are arranged so as to commonly support the ends of the two fluorescent lamps 2.2. Further, the remaining lamp holder 10d is provided over the entire length of the other side of the casing 1, and is provided for each lamp 2.2.
It supports the bent portions 5a and 5c of.

2 arranged at both ends on one side of the casing 1
Each of the two lamp holders 10a and 10b has a support hole 11 into which the end of the fluorescent lamp 2.2 is press-fitted, and a guide hole 12 that is continuous with the support hole 11 and leads out the lead wire 7a. .

The lamp holder 10c, which is arranged in the center on one side of the casing 1, has other support holes 13.13 into which the ends of the two fluorescent lamps 2.2 are inserted, and these support holes 13.13. 13 and has a guide hole 14.14 through which the lead wire 7b is led out.

The remaining lamp holder 1 provided on the other side of the casing 1
0d is the bent portion 5a of each lamp 2.2.

It has a recessed part 15... into which the part 5c is fitted.

Each fluorescent lamp 2.2 therefore has electrodes 6a, 6b
The sealed ends of the lamp holders 10a110b and 1
Supported by support holes 11.11 and 13.13 of 0c,
The bent portions 5a and 5c form the recessed portion 15 of the lamp holder 10d.
These lamp holders 10a are held by...
Mechanically attached to s 10 b -, 10c 510d.

In this case, the leads 7a, 7b of each fluorescent lamp 2.2
are led out from the guide holes 12.14 to the outer surfaces of the lamp holders 10a, 10b and 10c.

Note that the lamp holder 1 provided on the other side of the casing 1
0d is fixed to the casing 1 via an adhesive (not shown), but the other lamp holders 10a, 10b, and 10c are attached to the casing 1 by means described later.

A spacer 20 is provided on the bottom surface of the casing 1, as shown in FIG. The spacer 20 is made of heat-resistant resin such as polycarbonate, and is fixed to the bottom of the casing 1 using adhesive or by caulking a tongue piece (not shown) formed by cutting and raising the bottom of the casing 1. . This spacer 20 is placed at a position that avoids facing each bent bulb 3.3 of the lamp 2.2.

An electric heater 21 is placed on the top surface of such a spacer 20.
For example, they are attached and installed using an adhesive.

This heater 21 is formed by laminating the upper and lower surfaces of a heater body 22 shown in FIG. 2 with heat-resistant insulating films, such as polyester resin sheets 23 and 24. It is in contact with the bottom surface of 3.

A white sheet 25 made of polyester film is attached to the entire upper surface of the heater 21.

Note that the space surrounded by the heater 21, the bottom surface of the casing 1, and the spacer 20 constitutes a heat insulating layer 27, in which temperature sensors such as a thermistor 28 and a temperature fuse 29 are arranged.

A light diffusing and transmitting plate 30 is attached to the upper opening of the casing 1 . This light diffusing and transmitting plate 30 is made of a milky white material such as acrylic resin and has a light diffusing and transmitting effect.
, thick portions 31 are formed in portions facing each of the straight portions 4a, 4b, 4c, and 4d of the bulb 3. The thickness of these thick portions 31 gradually becomes thinner as the distance from the valve 3 increases.

Furthermore, a mesh 32 for preventing the emission of high frequency waves is provided on the inside of the light diffusing and transmitting plate 30 to prevent high frequency interference while the high frequency lighting type cold cathode fluorescent lamp 2 is lit. .

A wiring board 40 as a relay terminal is attached to one side of the casing 1. The wiring board 40 includes
Lead wires 7a and 7b of the fluorescent lamp 2.2 are soldered, and the heater 21 and thermistor 2
8 and a lead wire (not shown) connected to the temperature fuse 29 is soldered.

Covered cords 41 . . . are connected to this wiring board 40, and these covered cords 41 . . . are connected to printed wiring 42 .
Lead wires 7a, 7a, 7b of said lamp 2.2 via
, 7b.

Further, on this wiring board 40, other wiring cords 43...
・are connected, and these wiring cords 43...
The heater 21, thermistor 28 and temperature fuse 2
It is connected to a lead wire (not shown) connected to 9.

In addition, these coated cords 41... and wiring cords 4
Connectors 44... 45... are attached to the tips of 3....

The wiring board 40 is fixed to the casing 1 by locking claws 51, 51 and locking tongues 52 extending from the casing 1.

That is, the locking claws 51.51 extend from both ends of one side of the casing 1, and are bent and deformed to surround both longitudinal ends of the wiring board 40. The locking tongue piece 52 extends from the center of one side of the casing 1, is inserted into a locking hole 53 provided at the center of the wiring board 40, and is bent to lock onto the wiring board 40. There is.

Therefore, the wiring board 40 is fixed to the casing 1 by the locking claws 51, 51 and the locking tongues 52, and is integrated with the casing l.

In this case, the lamp holders 10a, 10b and 10c are sandwiched between the wiring board 40 and the casing 1.

That is, as shown in FIG. 5, the lower surface of one side of the casing 1 has sliding guide pieces 55, 55 at both ends, and a support piece 56 extending integrally at the center.

Further, on one side of the casing 1, the sliding guide piece 55 is provided.
．． A stop wall 57.57 is formed between the support piece 55 and the support piece 56 and facing the wiring board 40.

Lamp holders 10a and 10b located at both ends are placed on the sliding guide pieces 55 and 55 at both ends, respectively, and the upper surfaces of these lamp holders 10a and 10b are pressed by the peripheral edge of the light diffusing and transmitting plate 30. There is. These lamp holders 10a110b are connected to the wiring board 40 and the stop wall 5.
It is sandwiched between 7.57 and 57. In this case, these lamp holders 10a and 10b are held in such a way that they can be moved in the left and right direction.

A central lamp holder 10c is placed on the central support piece 56, and the upper surface of the lamp holder 10c is also held down by the peripheral edge of the light diffusing and transmitting plate 30. This lamp holder 10c is also sandwiched between the wiring board 40 and the stop walls 57, 57.

In this case, this lamp holder 10c has a central support piece 5.
It is fixed immovably by stop claws 58, 58, and 59 cut and raised at 6.

That is, the lamp holder 10c in the center is fixed so that it will not move even if it is sandwiched between the casing 1 and the wiring board 40, but the lamp holders 10a and 10b on both ends are between the casing 1 and the wiring board 40. Although it is sandwiched between the two, it is said that it can be moved left and right.

In addition, 60 in FIG. 4 is a ground wire.

The operation of the embodiment with such a configuration will be explained.

When the fluorescent lamps 2.2 are turned on, these lamps 2.2
emits light in a shape along the W-shaped bulb 3.3.

A part of the light emitted from these fluorescent lamps 2.2 is reflected on the upper surface of the white sheet 25 and directed to the light diffusing and transmitting plate 30 in the opening, and the remaining light is directly directed to the light diffusing and transmitting plate 30. . Therefore, almost all of the light emitted from the lamp 2.2 is irradiated to the outside through the light diffusing and transmitting plate 30.

In this case, each parallel straight section 4a, 4b of the valve 3.3
, 4c, 4d are formed on the inner surface of the light diffusing and transmitting plate 30, so the thick part 31 exists right above the knob 3, and this thick part 31 In addition to reducing the amount of light transmission, the thickness becomes thinner as the distance from the thick portion 31 increases, so the amount of light transmission increases. Therefore, the light diffusing and transmitting plate 31 has the effect of eliminating brightness unevenness by itself.

For this reason, the brightness distribution on the light diffusing and transmitting plate 31 is equalized, uneven brightness is reduced, and uniform brightness can be achieved over the entire surface.

When the heater 21 is energized before starting, the heater 21 generates heat and heats the fluorescent lamp 2.2. For this reason, the mercury and rare gas inside the bulb 3.3 are warmed to some extent, making it easier to start the discharge, and after the start of the discharge, the vapor pressure of the mercury and the rare gas is easier to rise to a predetermined pressure, and the luminous flux rises quickly. become. In other words, starting characteristics are improved even at low ambient temperatures.

Even during stable lighting, the fluorescent lamp 2.2 is heated by the heat generated by the heater 21, and the vapor pressure of mercury or rare gas is maintained at a predetermined pressure, thereby increasing the luminous efficiency.

For this reason, lamp efficiency can be improved even in a low temperature atmosphere.

Further, the heat generation effect of the heater 21 is controlled by the thermistor 28 such that it is energized below a predetermined temperature and is turned off when the temperature reaches a predetermined temperature or higher. Further, if the heater 21 generates abnormal heat, the temperature fuse 29 is controlled to cut off the current supply.

By the way, in this embodiment, since the wiring board 40 as a relay terminal is integrally attached to the casing 1,
Lead wire 7a of lamp 2.2.

7b, and the lead wires of the heater 21, thermistor 28, and temperature fuse 29 can be connected to this wiring board 40.

Therefore, the lengths of these lead wires can be shortened, making it easy to route them and eliminating the need for complicated wiring.

In addition, even if a shock or vibration occurs to the fixture body to which this lighting device is attached, the wiring board 40 vibrates together with the casing 1, so there is no need to worry about tensile force being applied to a particular lead wire, and the lead wire will break. This eliminates problems such as damage to electrical components.

Further, since the covered cords 41 and the wiring cords 43 that are connected to external lighting circuit components and controllers can be wired together in one place, wiring connections are easy.

In this embodiment, the lamp holder 10a is provided between the casing 1 and the wiring board 40 fixed thereto.
, 10b and 10c are clamped, it is easy to fix these lamp holders 10a, 10b and 10c.

Particularly, in the case of this embodiment, the lamp holder 10c at the center is sandwiched between the casing 1 and the wiring board 40 and fixed so as not to move, whereas the lamp holders 10a and 10b at both ends are mounted on the casing 1. Since it is sandwiched between the board 2.2 and the wiring board 40 so as to be movable in the left-right direction, variations in the shape of the bent lamp 2.2 and deformation due to heat generation can be absorbed.

That is, in the case of the bent lamp 2.2, it is formed into a W-shape by bending or molding, but variations in shape may occur during manufacturing, resulting in a difference in the distance between the two ends. Furthermore, the separation distance between both ends may increase due to heat generation during lighting. Therefore, even if the lamp holder 10c at the center that supports one end of the bulb 3 is fixed, the lamp holders 10a110 at both ends that support the other end of the bulb 3
b is movable in the left-right direction, the lamp holders 10a on both ends can be prevented from being deformed due to manufacturing variations or heating.
, 10b.

Therefore, damage to the lamp 2.2 is prevented.

Note that the present invention is not limited to the above embodiments.

That is, even a lighting device in which only a lamp is housed in the casing 1 can be implemented.

Further, the fluorescent lamp is not limited to a bent shape such as a W-shape or a U-shape, but may be a straight tube shape or the like, and one or a plurality of fluorescent lamps may be used.

Furthermore, the tube cross-sectional shape of the bulb 3 in the lamp 2 is not limited to a circular shape, but may be a flat shape.

If the lamp has a flat shape, the side surface with a large light emitting area can face the light diffusing and transmitting plate, increasing the effective utilization rate of the light emitted from the lamp.

Furthermore, the present invention may be applied to rare gas discharge lamps or other lamps in which only rare gas is filled in the bulb without mercury.

[Effects of the Invention] As explained above, according to the present invention, the wiring board as a relay terminal is fixed and integrated with the casing, so the wiring board is closer to the lamp, the lead wires are shorter, and the wiring structure is improved. 1. Even if the main body of the device is subjected to shock or vibration, the lead wire will not be pulled, and breakage of the wire and damage to the lamp will be prevented.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway plan view of the entire illumination device, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIGS. The figures are shown in Figure 1.
Fig. 5 is a bottom view of the whole. 1...Casing, 2...Fluorescent lamp, 3...
Valve, 6a16b... Electrode, 7a, 7b -...
Lead wires, 10a to 10d... lamp holder, 11.
13...Support hole, 12.14...Guide hole, 20...
・Spacer, 21... Heater, 28... Thermistor, 29... Temperature fuse, 30... Light diffusion and transmission plate,
40... Wiring board, 41... Covered cord, 43...
...Wiring code, 51...Latching claw, 52...Latching tongue piece.

Claims (1)

[Scope of Claims] A lighting device in which a lamp is housed in a casing provided with a light-transmitting plate on one side, and light emitted from the lamp is irradiated to the outside through the light-transmitting plate, comprising: A lighting device characterized in that the lead wires are connected to a wiring board, and the wiring board is fixed to the casing.